From c6101f91d071883b48b1b4b51e5eba0f36d9a78d Mon Sep 17 00:00:00 2001 From: Denis Bitouzé Date: Thu, 25 Feb 2021 18:23:07 +0000 Subject: French translation for tlmgr updated git-svn-id: svn://tug.org/texlive/trunk@57912 c570f23f-e606-0410-a88d-b1316a301751 --- Build/source/libs/pplib/ChangeLog | 2 - Build/source/libs/pplib/Makefile.am | 93 - Build/source/libs/pplib/Makefile.in | 1685 -- Build/source/libs/pplib/ac/withenable.ac | 7 - Build/source/libs/pplib/aclocal.m4 | 1179 -- Build/source/libs/pplib/config.h.in | 87 - Build/source/libs/pplib/configure | 16272 ------------------- Build/source/libs/pplib/configure.ac | 64 - Build/source/libs/pplib/include/Makefile.am | 43 - Build/source/libs/pplib/include/Makefile.in | 503 - Build/source/libs/pplib/pplib-src/.gitattributes | 10 - Build/source/libs/pplib/pplib-src/.gitignore | 8 - Build/source/libs/pplib/pplib-src/.gitmodules | 3 - Build/source/libs/pplib/pplib-src/.travis.yml | 20 - Build/source/libs/pplib/pplib-src/CMakeLists.txt | 6 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Build/source/libs/pplib/pplib-src/test/out1 delete mode 100644 Build/source/libs/pplib/pplib-src/test/out2 delete mode 100644 Build/source/libs/pplib/pplib-src/test/out3 delete mode 100755 Build/source/libs/pplib/pplib.test delete mode 100644 Build/source/libs/pplib/version.ac (limited to 'Build/source/libs/pplib') diff --git a/Build/source/libs/pplib/ChangeLog b/Build/source/libs/pplib/ChangeLog deleted file mode 100644 index dc14799022f..00000000000 --- a/Build/source/libs/pplib/ChangeLog +++ /dev/null @@ -1,2 +0,0 @@ -2020-04-18 Luigi Scarso luigi.scarso@gmail.com - * Moved luatexdir/luapplib under libs/pplib. \ No newline at end of file diff --git a/Build/source/libs/pplib/Makefile.am b/Build/source/libs/pplib/Makefile.am deleted file mode 100644 index 464aeb1357d..00000000000 --- a/Build/source/libs/pplib/Makefile.am +++ /dev/null @@ -1,93 +0,0 @@ -## $Id: Makefile.am 43567 2017-03-21 17:43:10Z karl $ -## Proxy Makefile.am to build pplib for TeX Live. -## -## Copyright 2017 Karl Berry -## Copyright 2013-2015 Peter Breitenlohner -## -## This file is free software; the copyright holder -## gives unlimited permission to copy and/or distribute it, -## with or without modifications, as long as this notice is preserved. -## -## We want to re-distribute the whole Lua53 source tree. -## -EXTRA_DIST = $(PPLIB_TREE) - -## Changes applied to the original source tree -## -EXTRA_DIST += TLpatches - -# Files not to be distributed -include $(srcdir)/../../am/dist_hook.am -NEVER_NAMES += $(NEVER_NAMES_SUB) $(NEVER_NAMES_LT) - -SUBDIRS = . include - -AM_CPPFLAGS = -I$(top_srcdir)/$(PPLIB_TREE)/src -I$(top_srcdir)/$(PPLIB_TREE)/src/util $(ZLIB_INCLUDES) $(PPLIB_DEFINES) -AM_CFLAGS = $(WARNING_CFLAGS) $(PPLIB_CFLAGS) - -noinst_LIBRARIES = libpplib.a - - -nodist_libpplib_a_SOURCES = \ - @PPLIB_TREE@/src/pparray.c \ - @PPLIB_TREE@/src/ppcrypt.c \ - @PPLIB_TREE@/src/ppdict.c \ - @PPLIB_TREE@/src/ppheap.c \ - @PPLIB_TREE@/src/ppload.c \ - @PPLIB_TREE@/src/ppstream.c \ - 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path = zlib - url = git://github.com/madler/zlib.git diff --git a/Build/source/libs/pplib/pplib-src/.travis.yml b/Build/source/libs/pplib/pplib-src/.travis.yml deleted file mode 100644 index 2f1c9a01cbc..00000000000 --- a/Build/source/libs/pplib/pplib-src/.travis.yml +++ /dev/null @@ -1,20 +0,0 @@ -language: c - -script: - - mkdir build - - cd build - - cmake .. - - make -j 2 - - make -j 2 test - -matrix: - include: - - os: linux - compiler: clang - - os: linux - compiler: gcc - - os: osx - osx_image: xcode10.2 - allow_failures: - - os: osx - osx_image: xcode8 diff --git a/Build/source/libs/pplib/pplib-src/CMakeLists.txt b/Build/source/libs/pplib/pplib-src/CMakeLists.txt deleted file mode 100644 index 8c2ea1e89ae..00000000000 --- a/Build/source/libs/pplib/pplib-src/CMakeLists.txt +++ /dev/null @@ -1,6 +0,0 @@ -cmake_minimum_required(VERSION 3.5) - -add_subdirectory(zlib) -add_subdirectory(src) - -enable_testing() diff --git a/Build/source/libs/pplib/pplib-src/README.md b/Build/source/libs/pplib/pplib-src/README.md deleted file mode 100644 index c684e9ed7ce..00000000000 --- a/Build/source/libs/pplib/pplib-src/README.md +++ /dev/null @@ -1,9 +0,0 @@ -## pplib - pdf disassembling library for LuaTeX - -This is `plib` - PDF disassembling library for LuaTeX (http://luatex.org) - -The library has no LuaTeX dependency, it depends only on `zlib`. -However, `pplib` was tailor-made for LuaTeX and its functionals are -somewhat limited (eg. read-only PDF support). - -Author: Paweł Jackowski p.jackowski@gust.org.pl diff --git a/Build/source/libs/pplib/pplib-src/azure-pipelines.yml b/Build/source/libs/pplib/pplib-src/azure-pipelines.yml deleted file mode 100644 index 365abe00716..00000000000 --- a/Build/source/libs/pplib/pplib-src/azure-pipelines.yml +++ /dev/null @@ -1,36 +0,0 @@ -# C/C++ with GCC -# Build your C/C++ project with GCC using make. -# Add steps that publish test results, save build artifacts, deploy, and more: -# https://docs.microsoft.com/azure/devops/pipelines/apps/c-cpp/gcc - -trigger: -- master - -jobs: - -- job: Build - - strategy: - matrix: - linux: - imageName: "ubuntu-16.04" - mac: - imageName: "macos-10.13" - windows: - imageName: "vs2017-win2016" - maxParallel: 3 - - pool: - vmImage: $(imageName) - - steps: - - checkout: self - submodules: recursive - - task: CMake@1 - displayName: 'CMake ..' - inputs: - cmakeArgs: '..' - - task: CMake@1 - displayName: 'CMake --build . --config Debug' - inputs: - cmakeArgs: '--build . --config Debug' diff --git a/Build/source/libs/pplib/pplib-src/doc/Makefile b/Build/source/libs/pplib/pplib-src/doc/Makefile deleted file mode 100644 index 3ca7eeebf89..00000000000 --- a/Build/source/libs/pplib/pplib-src/doc/Makefile +++ /dev/null @@ -1,20 +0,0 @@ -# Minimal makefile for Sphinx documentation -# - -# You can set these variables from the command line. -SPHINXOPTS = -SPHINXBUILD = sphinx-build -SPHINXPROJ = pplib -SOURCEDIR = . -BUILDDIR = _build - -# Put it first so that "make" without argument is like "make help". -help: - @$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O) - -.PHONY: help Makefile - -# Catch-all target: route all unknown targets to Sphinx using the new -# "make mode" option. $(O) is meant as a shortcut for $(SPHINXOPTS). -%: Makefile - @$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O) \ No newline at end of file diff --git a/Build/source/libs/pplib/pplib-src/doc/_build/doctrees/environment.pickle b/Build/source/libs/pplib/pplib-src/doc/_build/doctrees/environment.pickle deleted file mode 100644 index c4d657a1115..00000000000 Binary files a/Build/source/libs/pplib/pplib-src/doc/_build/doctrees/environment.pickle and /dev/null differ diff --git a/Build/source/libs/pplib/pplib-src/doc/_build/doctrees/ppapi-1.x.doctree b/Build/source/libs/pplib/pplib-src/doc/_build/doctrees/ppapi-1.x.doctree deleted file mode 100644 index bd22032c659..00000000000 Binary files a/Build/source/libs/pplib/pplib-src/doc/_build/doctrees/ppapi-1.x.doctree and /dev/null differ diff --git a/Build/source/libs/pplib/pplib-src/doc/_build/doctrees/ppapi-2.x.doctree b/Build/source/libs/pplib/pplib-src/doc/_build/doctrees/ppapi-2.x.doctree deleted file mode 100644 index d8c91b48bed..00000000000 Binary files a/Build/source/libs/pplib/pplib-src/doc/_build/doctrees/ppapi-2.x.doctree and /dev/null differ diff --git a/Build/source/libs/pplib/pplib-src/doc/_build/doctrees/ppapi.doctree b/Build/source/libs/pplib/pplib-src/doc/_build/doctrees/ppapi.doctree deleted file mode 100644 index 9e432d80125..00000000000 Binary files a/Build/source/libs/pplib/pplib-src/doc/_build/doctrees/ppapi.doctree and /dev/null differ diff --git a/Build/source/libs/pplib/pplib-src/doc/_build/doctrees/ppcode.doctree b/Build/source/libs/pplib/pplib-src/doc/_build/doctrees/ppcode.doctree deleted file mode 100644 index a33b506208e..00000000000 Binary files a/Build/source/libs/pplib/pplib-src/doc/_build/doctrees/ppcode.doctree and /dev/null differ diff --git a/Build/source/libs/pplib/pplib-src/doc/_build/doctrees/pplib.doctree b/Build/source/libs/pplib/pplib-src/doc/_build/doctrees/pplib.doctree deleted file mode 100644 index 0d5e84fe5a5..00000000000 Binary files a/Build/source/libs/pplib/pplib-src/doc/_build/doctrees/pplib.doctree and /dev/null differ diff --git a/Build/source/libs/pplib/pplib-src/doc/_build/doctrees/ppnew.doctree b/Build/source/libs/pplib/pplib-src/doc/_build/doctrees/ppnew.doctree deleted file mode 100644 index 5c152d321a5..00000000000 Binary files a/Build/source/libs/pplib/pplib-src/doc/_build/doctrees/ppnew.doctree and /dev/null differ diff --git a/Build/source/libs/pplib/pplib-src/doc/_build/html/.buildinfo b/Build/source/libs/pplib/pplib-src/doc/_build/html/.buildinfo deleted file mode 100644 index ec014001dee..00000000000 --- a/Build/source/libs/pplib/pplib-src/doc/_build/html/.buildinfo +++ /dev/null @@ -1,4 +0,0 @@ -# Sphinx build info version 1 -# This file hashes the configuration used when building these files. When it is not found, a full rebuild will be done. -config: 5a0a9f8c8bb0798c3d499fe9e55f5963 -tags: 645f666f9bcd5a90fca523b33c5a78b7 diff --git a/Build/source/libs/pplib/pplib-src/doc/_build/html/_sources/ppapi-1.x.rst.txt b/Build/source/libs/pplib/pplib-src/doc/_build/html/_sources/ppapi-1.x.rst.txt deleted file mode 100644 index df661a7b82d..00000000000 --- a/Build/source/libs/pplib/pplib-src/doc/_build/html/_sources/ppapi-1.x.rst.txt +++ /dev/null @@ -1,937 +0,0 @@ - -``pplib`` 1.x -============= - -``pplib`` is a library for raw PDF access. It parses PDF documents and provides an interface to access document structures in C. - -C-API -===== - -Types ------ - -``pplib`` defines several C-types to represent PDF types: - -- ``ppint`` - signed integer (``int64_t``) -- ``ppnum`` - real number (double) -- ``ppname`` - PDF name -- ``ppstring`` - PDF string -- ``pparray`` - PDF array -- ``ppdict`` - PDF dict -- ``ppstream`` - PDF stream -- ``ppref`` - PDF indirect reference -- ``ppobj`` - a container of all above - -Among ``ppint`` and ``ppnum``, we also use ``ppuint`` - unsigned integer (machine word, alias to ``size_t``). - -Other API types: - -- ``ppdoc`` - PDF document -- ``ppxref`` - cross-references table -- ``ppcontext`` - ... later -- ``pprect`` - rectangle -- ``ppmatrix`` - matrix - -Integer, number, name and string are treated as simple types. -Names and strings are actually C-structures, but exposed to API as typedefs to ``const char *``. -Other types (array, dict, stream, reference, object container, xref, PDF) are C-structures, -and you operate it their pointers. So when you declare a simple type variable you say:: - - ppuint u; - ppnum n; - ppname name; - ppstring string; - ... - -And when you declare a compound type you operate on pointers:: - - ppobj *obj; - pparray *array; - ppdict *dict; - ppstream *stream; - ppref *ref; - ppdoc *pdf; - -Some of those C-types are defined in library header ``ppapi.h`` (complete types). Some others are incomplete -(eg. you can't say ``sizeof(ppdoc)`` or ``sizeof(ppxref)``). This is to avoid unnecesary dependencies in -the header. [At some points it's not clear to me what to hide and what to expose, will see.] The library itself -uses ``pplib.h`` but for auxilary applications including a standalone ``ppapi.h`` header should be enough. - -``pplib`` was designed having **read-only** PDF access in mind. Even if some structure is completelly exposed, -so that you can directly access its members, you should treat them as read-only. I don't make them ``const`` because -then all variable declarations would need to be ``const``, which is annoying, and I'd need some trickery in the library -internals to unconst. Besides, nothing is really const for C type casts. - -Object ------- - -A common container for all elementary PDF object types is ``ppobj`` structure. ``ppobj`` has a type identifier -(integer) and union of values:: - - struct ppobj { - ppobjtp type; - union { - ppint integer; - ppnum number; - ppname name; - ppstring string; - pparray *array; - ppdict *dict; - ppstream *stream; - ppref *ref; - void *any; - }; - }; - -Object type is one of constants (enum):: - - PPNONE - PPNULL - PPBOOL - PPINT - PPNUM - PPNAME - PPSTRING - PPARRAY - PPDICT - PPSTREAM - PPREF - -The type determines the structure member you're allowed to access:: - - ppobj *obj; - ... - switch (obj->type) - { - case PPNONE: // shouldn't actually happen, indicates some failure - break; - case PPNULL: // valid PDF null object, no value - break; - case PPBOOL: // do something with obj->integer (ppint), value 0 or 1 - break; - case PPINT: // do something with obj->integer (ppint) - break; - case PPNUM: // do something with obj->number (ppnum) - break; - case PPNAME: // do something with obj->name (ppname) - break; - case PPSTRING: // do something with obj->string (ppstring) - break; - case PPARRAY: // do something with obj->array (pparray *) - break; - case PPDICT: // do something with obj->dict (ppdict *) - break; - case PPSTREAM: // do something with obj->stream (ppstream *) - break; - case PPREF: // do something with obj->ref (ppref *) - break; - } - -More often then not you know exactly what type of object value is expected, in which case -you may use one of the following macros:: - - // returns 1 if o->type is PPNULL - int ppobj_get_null(o) \ - - // if o->type is PPBOOL, sets int v to 0 or 1 and returns 1, 0 otherwise - int ppobj_get_bool(o, v) - - // if o->type is PPINT, sets ppint v and returns 1, 0 otherwise - int ppobj_get_int(o, v) - - // if o->type is PPINT and >= 0, sets ppuint v and returns 1, 0 otherwise - int ppobj_get_uint(o, v) - - // if o->type is PPNUM or PPINT, sets ppnum v and returns 1, 0 otherwise - int ppobj_get_num(o, v) - - // if o->type is PPNAME returns the name, NULL otherwise - ppname ppobj_get_name(o) - - // if o->type is PPSTRING returns the string, NULL otherwise - ppstring ppobj_get_string(o) - - // if o->type is PPARRAY returns the array, NULL otherwise - pparray * ppobj_get_array(o) - - // if o->type is PPDICT returns the dict, NULL otherwise - ppdict * ppobj_get_dict(o) - - // if o->type is PPSTREAM returns the stream, NULL otherwise - ppstream * ppobj_get_stream(o) - - // if o->type is PPREF returns the reference, NULL otherwise - ppref * ppobj_get_ref(o) - -Note the coercion from integer to real number, but not reverse. In practise, whenever you expect a real number, -you should also handle integer (eg. '1' used instead of '1.0'). - -It is a common case that the object is given as an indirect reference, but what you actually -want is not the reference, but the object referred by it. Here is a helper for it:: - - // if o->type is PPREF, returns what the reference points, otherwise returns o - ppobj * ppobj_rget_obj(o) - -Also every ``ppobj_get_*`` macro has ``ppobj_rget_*`` counterpart that makes a check -for the expected type, but if the object is PPREF, it jumps to the target object. -So for example ``ppobj_rget_dict(obj)`` will return dict if ``obj`` is of type PPDICT -or if it is of type PPREF and ``obj->ref`` hosts an object of type PPDICT. - -Names ------ - -PDF names are represented as ``ppname``. -I find it convenient to have ``ppname`` type pretending ``const char *``. This allows to use ``ppname`` -in all C-style string functions like ``printf("%s", name)``. - -Be aware, however, that ``ppname`` is actually a C-structure. It is perfectly ok to cast ``ppname`` to ``const char *``:: - - ppname name; - ... - (const char *)name; - -But reverse is forbidden:: - - const char *cstr = "cstring"; - ... - (ppname)cstr; // expect segmentation fault soon - -For convenient use in C, names are ``'\0'`` terminated. But to get the length of name better always use -``ppname_size()`` macro. ``ppname`` object knows its size, don't use ``strlen()``:: - - size_t ppname_size(ppname name); // macro, returns length of name in bytes - -In current implementation names are not hashed anyhow, so name-to-name comparison is not smarter than ``memcmp()``. -Use macros:: - - int ppname_is(ppname name, "literal"); // to compare ppname with C-literal string - int ppname_eq(ppname name, ppname other); // to compare ppname with a different name - -If you'll use ``pplib`` to parse contents streams, you may need to distinguish names from operators -(more precisely executable names). Names in PDF are preceeded by '/', executable names aren't. In both -cases PDF parser will produce ``ppname`` but can be distingushed with:: - - int ppname_exec(ppname name); // returns non-zero if name is executable - -Names are kept in their raw form, with possible PDF specific escapes (in text below we call it **encoded** form). -Leading '/' is omitted, though. One may need a decoded name, with no PDF escapes. -A pair of functions provides a simple interface to switch between those two forms:: - - ppname ppname_decoded (ppname name); // returns decoded (unescaped) form of the name - ppname ppname_encoded (ppname name); // returns encoded (escaped) form of the name - -In pretty most cases PDF names contains only letters (no special characters, no escapes), so decoded and encoded forms are identical. -In that case both functions simply return the argument. It is ok to call ``ppname_decoded()`` on already decoded form -and ``ppname_encoded()`` on already encoded form. Both forms are produced by PDF objects parser, so accessing ``ppname`` alter ego -in whatever direction needs no extra decoding or allocation costs. - -String ------- - -PDF strings have the same internal construction as names, so most of names description above applies to strings as well. -``ppstring`` is a typedef of ``const char *``, roughly ``'\0'`` terminiated C-string. To get the size of the string:: - - size_t ppstring_size(ppstring string); // macro, returns the length of the string in bytes - -Strings are provided in their raw form, preserving PDF specific escapes, but with no -``()`` or ``<>`` delims. To distinguish plain strings from hex strings:: - - int ppstring_hex(ppstring string); // macro, returns non zero if hex string - -Or if you prefer:: - - switch (ppstring_type(string)) - { - case PPSTRING_PLAIN: // literal string, surrounded by ``(`` and ``)`` in PDF - break; - case PPSTRING_BASE16: // hex string, surrounded by ``<`` and ``>`` in PDF - break; - case PPSTRING_BASE85: // base85 string surrounded by ``<~`` and ``~>`` in PDF - break; - } - -The last is actually Postscript specific, not used in PDF, but I think it might appear in contents streams... -No matter how the string is given in PDF (plain or hex), here are two functions to -switch between encoded and decoded strings forms:: - - ppstring ppstring_decoded (ppstring string); // returns decoded string possibly with PDF escapes - ppstring ppstring_encoded (ppstring string); // returns encoded string with no PDF escapes - -For hex strings, encoded form contains hex digits, while decoded form contains arbitrary bytes (the result of hex decoding). -Plain strings usually contains printable ASCII characters, but they might contain any binary data. -As with names, objects parser produces both forms. The raw form with PDF escapes (or raw hex form) is considered the main one. -Eg. when you access ``obj->string`` you always get the encoded form. At any moment you can switch to its alter ego. - -No matter if the string is plain or hex, if its first two bytes (decoded) are UTF16 BOM, the string -is considered unicode. ``ppstring`` object *knows* it is unicode or not:: - - switch (ppstring_utf(string)) - { - case PPSTRING_UTF16LE: // unicode string, utf16le - break; - case PPSTRING_UTF16BE: // unicode string, utf16be - break; - default: // no unicode - } - -Or simply:: - - if (ppstring_utf(string) != 0) { - // handle unicode string - } - -If the string is unicode, BOM remains the part of the string -- ``pplib`` parser does not strip it. -Unicode or not, encoded or decoded, strings are always C-arrays of bytes and ``ppstring_size()`` -always returns the size in bytes. - -Array ------ - -PDF arrays are represented as ``pparray`` type, which is C-array of ``ppobj`` structures. -To get the size:: - - size_t pparray_size(pparray *array) // macro, returns the number of array items - -To get ``ppobj *`` at a given index:: - - ppobj * pparray_at(array, index) // macro, returns ppobj * (no index check) - ppobj * pparray_get(array, index) // macro, returns ppobj * or NULL (with index check) - ppobj * pparray_get_obj (pparray *array, size_t index); // function equiv to pparray_get() - -Iterating over array elements:: - - pparray *array; - size_t index, size; - ppobj *obj; - for (size = pparray_size(array), pparray_first(array, index, obj); index < size; pparray_next(index, obj)) - { - // do something with index and obj - } - -There is no magic first/next macros, just iteration over pointers. One could also use something like:: - - for (index = 0, size = array->size; index < size; ++index) - { - obj = pparray_at(array, index); - // do something with index and obj - } - -When getting values from array and expecting a result of known type, use one of the following:: - - int pparray_get_bool (pparray *array, size_t index, int *v); // get boolean value - int pparray_get_int (pparray *array, size_t index, ppint *v); // get ppint value - int pparray_get_uint (pparray *array, size_t index, ppuint *v); // get ppuint value - int pparray_get_num (pparray *array, size_t index, ppnum *v); // get ppnum value - ppname pparray_get_name (pparray *array, size_t index); // get ppname value - ppstring pparray_get_string (pparray *array, size_t index); // get ppstring value - pparray * pparray_get_array (pparray *array, size_t index); // get pparray * value - ppdict * pparray_get_dict (pparray *array, size_t index); // get ppdict * value - ppref * pparray_get_ref (pparray *array, size_t index); // get ppref * value - -As with ``ppobj_get_*`` suite, numeric types getters set the value of a given type and returns 1, if the type matches. -Otherwise sets nothing and returns 0. Other getters return the value if the type matches, or NULL. - -Every function from ``pparray_get_*`` suite have its ``pparray_rget_*`` counterpart that -that dereferences indirect objects (as explained for ``ppobj_rget_*`` getters). Note that -there is no ``pparray_get_stream()`` function, as streams in PDF are always indirect. -To get the stream from array use:: - - ppstream * pparray_rget_stream (pparray *array, size_t index); - -Dict ----- - -PDF dicts are represented as ``ppdict`` structure, which is C-array of ``ppobj`` with parallel -C-array of ``ppname`` pointers. To get the size of a dict:: - - size_t ppdict_size(ppdict *dict) // macro, returns the number of key-val pairs - -To get the value at a given index (integer):: - - ppobj * ppdict_at(ppdict *dict, index) // macro, no index check - -To get the name (key) at a given index:: - - ppname ppdict_key(ppdict *dict, index) // macro, no index check - -To iterate over dict key-val pairs:: - - ppdict *dict; - ppname *pkey; - ppobj *obj; - - for (ppdict_first(dict, pkey, obj); *pkey != NULL; ppdict_next(pkey, obj)) - { - // do something with *pkey and obj - } - -There is no magic in first/next macros, just iteration through keys and values lists pointers. -For convenient iteration, a list of keys is terminated with NULL, so in the code above ``*pkey != NULL`` -is used as the loop condition. One may also iterate via indices:: - - ppdict *dict; - size_t index, size; - ppname key; - ppobj *obj; - for (index = 0, size = ppdict_size(dict); index < size; ++index) - { - key = ppdict_key(dict, index); - obj = ppdict_at(dict, index); - // do something with key and obj - } - -To get the object associated with a given name, use one of the following:: - - ppobj * ppdict_get_obj (ppdict *dict, const char *name); - int ppdict_get_bool (ppdict *dict, const char *name, int *v); - int ppdict_get_int (ppdict *dict, const char *name, ppint *v); - int ppdict_get_uint (ppdict *dict, const char *name, ppuint *v); - int ppdict_get_num (ppdict *dict, const char *name, ppnum *v); - ppname ppdict_get_name (ppdict *dict, const char *name); - ppstring ppdict_get_string (ppdict *dict, const char *name); - pparray * ppdict_get_array (ppdict *dict, const char *name); - ppdict * ppdict_get_dict (ppdict *dict, const char *name); - ppref * ppdict_get_ref (ppdict *dict, const char *name); - -Note that all getters accepts ``const char *`` as key, so it is ok to say:: - - ppdict_rget_dict(dict, "Resources"); - -as well as:: - - ppdic_rget_dict(dict, name); // ppname name - -Every ``ppdict_get_*`` getter has ``ppdict_rget_*`` counterpart that dereferences -indirect objects if necessary. Note that there is no ``ppdict_get_stream()`` function, -but there is:: - - ppstream * ppdict_rget_stream (ppdict *dict, const char *name); - -So far dicts comes with no names mapping, so by-name dict accessors perform a linear search -through the keys list. PDF dicts are usually small, so it is fast enough. -Building names lookup for every dict in PDF makes no sense I think, as ``pplib`` applications -will query just several dicts I guess.. However, some apps may extensively query -resources, which may refer to hundreds of objects (eg. images). So some mapping for dicts -is still considered. - -Stream ------- - -PDF streams are represented as ``ppstream`` objects. To get the stream dict:: - - ppdict * ppstream_dict(ppstream *stream) // macro - -To read the stream data:: - - uint8_t * ppstream_first (ppstream *stream, size_t *size, int decode); - uint8_t * ppstream_next (ppstream *stream, size_t *size); - void ppstream_done (ppstream *stream); - -Both ``first` and ``next`` functions return a chunk of stream data and sets the ``size`` of the chunk. -``decode`` parameter tell the reader to decompress the stream (1) or return raw (0). A call to ``ppstream_next()`` -must be preceeded by ``ppstream_first()``. Once you're done with the stream, you have to call ``ppstream_done()``, -no matter if the stream has been read to the end or not. The stream data iterator in use:: - - uint8_t *data; - size_t size; - ppstream *stream; - int decode = 1; // 1 - get decompressed, 0 - get raw - - for (data = ppstream_first(stream, &size, decode); data != NULL; data = ppstream_next(stream, &size)) - { - // do something with data and its size - } - ppstream_done(stream); - -Every subsequent iterator call invalidates the previous reader output, so you have to utilize the returned chunk -of data just after you ot that. So the following is wrong:: - - data1 = ppstream_first(stream, &size, 1); - data2 = ppstream_next(stream, &size); - data3 = ppstream_next(stream, &size); - some_output(data1, size); - some_output(data2, size); - -The reader calls usually return the same pointer to internal buffer, just filled with a different data. -``pplib`` allocates reasonably large buffer and fills that buffer on subsequent calls to the reader. - -If the source stream has no compression, using both ``decode == 1`` and ``decode == 0`` should give the same result. -You can check if the stream is actually compressed with:: - - ppstream_compressed(stream) // macro, returns non zero if /Filter is present - -It might be necessary to load the entire stream data at once:: - - uint8_t * ppstream_all (ppstream *stream, size_t *size, int decode); - -If the initial buffer size is insufficient, it grows until the entire stream data is loaded. You must call -``ppstream_done(stream)`` after using returned data. - -``ppstream_done()`` doesn't invalidate the stream object, it just closes its internal reader. -The stream itself remains a valid object (eg. one can read it again if necessary), -but the reader buffer is released. It is actually not freed but kept for future the reuse with that on some other stream, -but you still need to mark it ready for reuse to avoid allocating a separate buffer for every stream you're going to read. - -Stream data readers will return ``NULL`` if you haven't close the previous reader process with ``ppstream_done()``. All below is wrong:: - - data1 = ppstream_all(stream, &size, 1); - data2 = ppstream_all(stream, &size, 1); // data2 == NULL - // or - data1 = ppstream_first(stream, &size, 1); - data2 = ppstream_first(stream, &size, 1); // data2 == NULL - // or - data1 = ppstream_first(stream, &size, 1); - data2 = ppstream_all(stream, &size, 1); // data2 == NULL - -To avoid unnecessary dependencies, ``pplib`` does not support image filters (``/DCT``, ``/JPX``, ``/JBIG``, ``/CCITT``). -But it is ok to read the stream with ``decode`` set to 1 on such streams. ``pplib`` assumes that the image is the -final/target stream form and just returns it as-is. Eg. in the case of JPEG (``/DCT`` filtered) image both calls should -give the same results:: - - ppstream_all(jpegstream, &jpegsize, 0); // don't decode, return what's there - ppstream_all(jpegstream, &jpegsize, 1); // decode but found image filter, effectively the same - -A bit more about streams memory. As mentioned, ``pplib`` allocates buffers for stream readers. After ``ppstream_done()``, -the stream no longer *owns* the buffer space. But the buffer may remain allocated, to be reused with future readers. -``pplib`` keeps a pool of several buffers. This means, that when you use stream readers, ``pplib`` eats -some memory (1MB or so) that is not freed, even if no streams are used. And even if you free all objects. -If you suffer from this, you can optionally use a pair of functions:: - - void ppstream_init_buffers (void); - void ppstream_free_buffers (void); - -The first initializes buffers pool, unless done so far. Currently ``pplib`` cares of it before opening every stream reader, -so it is not obligatory. The second frees a pool of buffers. The intended use is to call ``ppstream_init_buffers()`` once -as kind of library initializer and to call ``ppstream_free_buffers()`` once, as the library finalizer. - -Filters -------- - -In version v1.00 (20190916) ``ppstream`` API has been extended with filters information. -``ppstream`` knows its filter(s) and keps it as ``stream->filter``:: - - // ppstream *stream; - ppstream_filter *info = &stream->filter; - -``ppstream_filter`` is the following structure:: - - typedef struct { - ppstreamtp *filters; // c-array of filter identifiers (enum integers) - ppdict **params; // c-array of ppdict pointers - size_t count; // number of filters, length of the arrays (typically 1) - } ppstream_filter; - -If ``count > 0`` then ``filters`` member is not NULL. Filters array keeps integer constants:: - - PPSTREAM_BASE16 /* /ASCIIHexDecode */ - PPSTREAM_BASE85 /* /ASCII85Decode */ - PPSTREAM_RUNLENGTH /* /RunLengthDecode */ - PPSTREAM_FLATE /* /FlateDecode */ - PPSTREAM_LZW /* /LZWDecode */ - PPSTREAM_CCITT /* /CCITTFaxDecode */ - PPSTREAM_DCT /* /DCTDecode */ - PPSTREAM_JBIG2 /* /JBIG2Decode */ - PPSTREAM_JPX /* /JPXDecode */ - PPSTREAM_CRYPT /* /Crypt */ - -Params array keeps corresponding filter parameters (``/DecodeParms``) if present. ``params`` member is not NULL -if ``count > 0`` and the stream dict has ``/DecodeParms`` entry. Even if ``params`` is there, -for every N-th filter, ``params[N]`` may be NULL (corresponding to PDF ``null``). - -``stream->filter`` keeps the source stream filter information, which may not correspond to the result of stream readers -(``ppstream_first()``, ``ppstream_next()``, ``ppstream_all()``). The get the filters info relevant to the result from readers:: - - void ppstream_filter_info (ppstream *stream, ppstream_filter *info, int decode); - -The function fills ``ppstream_filter`` structure according to the expected result from stream readers (example 3 shows -how to use it to reconstruct ``/Filter`` and ``/DecodeParms`` when copying the stream to some other PDF). - -To convert filter identifier (``ppstreamtp``) to a corresponding PDF filter name:: - - const char * ppstream_filter_name[]; - -To covert ``ppname`` to filter identifier:: - - int ppstream_filter_type (ppname filtername, ppstreamtp *filtertype); - // returns 1 and sets filtertype if filtername is the proper filter name - -Additional information about the stream can be fetched from macros:: - - ppstream_compressed(stream) /* stream->flags & (PPSTREAM_FILTER|PPSTREAM_IMAGE) */ - ppstream_filtered(stream) /* stream->flags & PPSTREAM_FILTER */ - ppstream_image(stream) /* stream->flags * PPSTREAM_IMAGE */ - -``stream->flags`` is a binary sum of the following:: - - PPSTREAM_FILTER /* set iff the stream filters list has one of: BASE16, BASE85, RUNLENGTH, FLATE, LZW */ - PPSTREAM_IMAGE /* set iff the stream filters list has one of: CCITT, DCT, JBIG2, JPX */ - PPSTREAM_ENCRYPTED /* set iff the stream is encrypted */ - PPSTREAM_ENCRYPTED_OWN /* set iff the stream has own CRYPT filter */ - -Note that ``PPSTREAM_COMPRESSED`` is not there any longer, use ``ppstream_compressed()`` instead. -And there is some more, see ``ppapi.h``. - -Ref ---- - -Indirect objects are represented as ``ppref`` structure. To get the object that the -reference refers to:: - - ppobj * ppref_obj(ppref *ref) // macro - -``ppref`` structure also keeps the reference number and version, a pointer to cross reference table it belongs -to and others, but I guess you won't need anything but the referenced object. ``pplib`` parser resolves references -on-fly. So if there is a dict with indirect objects:: - - << - /Type /Page - /Resources 123 0 R - ... - >> - -the parser will produce ``ppdict`` with ``Resources`` key pointing the proper ``ppref *`` value. -If you need more, access ``ppref`` members:: - - struct ppref { - ppobj object; // target object - ppuint number, version; // identifiers - size_t offset; // file offset (useless for you, may be zero for compressed objects) - ppuint length; // the length of the original object data - ppxref *xref; // cross reference table it belongs to - }; - - -XRef ----- - -Cross reference table is exposed as ``ppxref`` (incomplete type, you can only oprate on its pointer). -To get top document xref:: - - ppxref * ppdoc_xref (ppdoc *pdf); - -To get previous (older) xref:: - - ppxref * ppxref_prev (ppxref *xref); - -To find an object of a given refnumber:: - - ppref * ppxref_find (ppxref *xref, ppuint refnumber); - -[Note: since pplib v0.98 in case of documents with incremental update, ``ppxref_find()`` returns -the newest available version of a given object rather than the object in a given body.] - -PDF ---- - -PDF document is represented as ``ppdoc`` structure (incomplete type, you can only operate on its pointer). -To load a document from file:: - - ppdoc * ppdoc_load (const char *filename); - -To load a document from memory data:: - - ppdoc * ppdoc_mem (const void *data, size_t size); - -The data is assumed to be a buffer allocated with ``malloc`` - it is freed when destroying ``ppdoc``. - -Both loaders returns ``NULL`` on failure. - -To free ``ppdoc`` and all objects it refers to:: - - void ppdoc_free (ppdoc *pdf); - -So far we haven't mention about any explicit object reclaimers. There are no dedicated ``free`` functions -for other objects. You don't allocate or free objects yourself. ``ppdoc`` object is an owner of all -beings it refers to. It also means that every object described so far is alive as long as the containing -``ppdoc`` is alive. - -To access main PDF dicts:: - - ppdict * ppdoc_trailer(ppdoc *pdf); // returns top xref trailer dict - ppdict * ppdoc_catalog(ppdoc *pdf); // returns catalog referred from the trailer - ppdict * ppdoc_info(ppdoc *pdf); // returns info dict referred from the trailer - -To get the PDF version:: - - const char * ppdoc_version_string (ppdoc *pdf); // version string - int ppdoc_version_number (ppdoc *pdf, int *minor); // minor and major numbers - -To get the file size of the source PDF document:: - - size_t ppdoc_file_size (ppdoc *pdf); - -To get the number of objects in all xrefs:: - - ppuint ppdoc_objects (ppdoc *pdf); - -To get the approx usage of memory:: - - size_t ppdoc_memory (ppdoc *pdf, size_t *waste); - -Encryption ----------- - -``pplib`` handles encrypted (password protected) documents. If a document is encrypted, most of strings and streams are ciphered. -In that form they are unreadable and rather useless, you can't even rewrite such strings/streams as-is to a different PDF output. -It is a common practise to *protect* documents with an empty password. Such documents remain readable in Acrobat (just opens them without prompting -for a password), but some features (eg. printing) may restricted by the application. - -When ``pplib`` detects encryption, it follows Acrobat approach and first tries an empty password. If it succeeds, ``pplib`` proceeeds normally, providing -an access to decrypted strings and streams, as if they weren't ciphered. If the document is protected with non-empty password, ``pplib`` gives -a way to provide a password and proceed. Until you provide a password, ``ppdoc`` object returned by ``ppdoc_load()`` function has all object wntries -set to ``null``. - -After loading a document you should check encryption status with:: - - ppcrypt_status ppdoc_crypt_status (ppdoc *pdf); - -``ppcrypt_status`` (integer) may have the following values: - - ``PPCRYPT_NONE`` - no encryption, go ahead - ``PPCRYPT_DONE`` - encryption present but password succeeded, go ahead - ``PPCRYPT_PASS`` - encryption present, need non-empty password - ``PPCRYPT_FAIL`` - invalid or unsupported encryption (eg. undocumented in pdf spec) - -If a password is needed, you can provide one with:: - - ppcrypt_status ppdoc_crypt_pass (ppdoc *pdf, const void *userpass, size_t userpasslength, - const void *ownerpass, size_t ownerpasslength); - -Well, yes, there are actually two passwords in encrypted documents. Relation between them is obscure to me, but enough -to know that having one of them is enough to decrypt the document. If you know the password, you probably mean -``userpass``, in which case you should put ``NULL`` as ``ownerpass``. The function returns ``PPCRYPT_DONE`` if the password -succeeds and the previous status otherwise. Your custom loader function may look like that:: - - ppdoc *pdf; - pdf = ppdoc_load("file.pdf"); - if (pdf == NULL) - return NULL; - switch (ppdoc_crypt_status(pdf)) - { - case PPCRYPT_NONE: - case PPCRYPT_DONE: - return pdf; - case PPCRYPT_PASS: - if (ppdoc_crypt_pass(pdf, "dummy", 5, NULL, 0) == PPCRYPT_DONE || - ppdoc_crypt_pass(pdf, NULL, 0, "dummy", 5) == PPCRYPT_DONE) - return pdf; - printf("sorry, password needed\n"); - ppdoc_free(pdf); - return NULL; - case PPCRYPT_FAIL: - printf("sorry, encryption failed\n"); - ppdoc_free(pdf); - return NULL; - } - -[If you get ``PPCRYPT_FAIL`` it might mean *I failed*, so treat as a bug.] - -If you'd like to know what permissions are given/restricted to encrypted document:: - - ppint ppdoc_permissions (ppdoc *pdf); - -Returned value can be queried with the following binary flags (you can verify with Acrobat *File -> Properties -> Security* tab):: - - PPDOC_ALLOW_PRINT // printing - PPDOC_ALLOW_MODIFY // filling form fields, signing, creating template pages - PPDOC_ALLOW_COPY // copying, copying for accessibility - PPDOC_ALLOW_ANNOTS // filling form fields, copying, signing - PPDOC_ALLOW_EXTRACT // contents copying for accessibility - PPDOC_ALLOW_ASSEMBLY // (no effect) - PPDOC_ALLOW_PRINT_HIRES // (no effect) - -``pplib`` does absolutelly nothing with permissions, it cares only to decrypt the document. As mentioned, encryption applies to strings -and streams. ``pplib`` decrypt strings when parsing document objects, so the result you get is *normal* (not ciphered). -Streams are decrypted whenever you access them. Even if you ask for a raw stream data, you'll get a raw (compressed) stream, but decrypted. -So except the check to ``ppdoc_crypt_status()``, you shouldn't bother about encryption. - -In encrypted documents most of streams are encrypted. To check if a given stream is encrypted:: - - ppstream_encrypted(stream) // macro, returns non-zero if encrypted - -Encryption is independent from compression, don't confuse with ``ppstream_compressed()`` - -Pages ------ - -Several helpers to deal with pages. To get the number of pages:: - - ppuint ppdoc_page_count (ppdoc *pdf); - -To access the root pages tree node:: - - ppref * ppdoc_pages(ppdoc *pdf); - -To get the page reference at a given index:: - - ppref * ppdoc_page (ppdoc *pdf, ppuint index); - -``index`` is a page number. First page has number 1. For index out of bounds ``ppdoc_page()`` returns NULL. -Iterating over pages using index from 1 to ``ppdoc_page_count()`` and calling ``ppdoc_page()`` on each iteration -would be suboptimal. Here is a dedicted iterator for this:: - - ppref * ppdoc_first_page (ppdoc *pdf); - ppref * ppdoc_next_page (ppdoc *pdf); - -The iterator in use:: - - ppdoc *pdf; - ppref *ref; - ppdict *dict; - int pageno; - - pdf = ppdoc_load("file.pdf"); - for (ref = ppdoc_first_page(pdf), pageno = 1; ref != NULL; ref = ppdoc_next_page(pdf), ++pageno) - { - dict = ppref_obj(obj)->dict; // take for granted it is a dict - // do something with the page dict - } - -Functions related to pages return ``ppref *`` ensured to contain dict object, so you don't need sanity -type checks here. - -Contents --------- - -PDF page contents can be given as a stream or array of streams. Here is a convenience iterator over page -contents streams:: - - ppstream * ppcontents_first (ppdict *dict); - ppstream * ppcontents_next (ppdict *dict, ppstream *stream); - -A complete example of contents stream parser use is given below (example 2). -But before we get there, we need to introduce ``ppcontext`` object. Conceptually, -``ppcontext`` is an owner (memory handler) of objects created on demand (beyond the ``ppdoc``). -So far used only with contents stream parser, which might produce quite some data that we want -to release just after used. To create a new context:: - - pcontext * ppcontext_new (void); - -It initializes a new context and its internal memory heap, taking about 64kB on start. After that, -the context is ready to produce objects (contents parsing functions below). Once objects produced -from a given context are no longer needed:: - - void ppcontext_done (ppcontext *context); - -It restores the context to its initial state, as after ``ppcontext_new()``. It means that the context -is ready to produce another bunch of beings (in the example below, all objects from the next page contents). -Once the context is not needed anymore:: - - void ppcontext_free (ppcontext *context); - -Now, contents stream parser functions take the context as an argument. Iterator form of contents stream parser -that allows to process the contents operator by operator:: - - ppobj * ppcontents_first_op (ppcontext *context, ppstream *stream, size_t *psize, ppname *pname); - ppobj * ppcontents_next_op (ppcontext *context, ppstream *stream, size_t *psize, ppname *pname); - -Returned ``ppobj *`` is a pointer to operands list. ``*psize`` is the number of operands on stack. -The operator itself is stored as ``*pname``. - -To parse the entire contents stream at once with no stop at every operator:: - - ppobj * ppcontents_parse (ppcontext *context, ppstream *stream, size_t *psize); - -Returns probably quite long list of all parsed objects (operands and operatos) in one piece. -The number of objects is stored to ``*psize``. - -[Contents may contain so called inline images, that breaks a simple scheme of operands / operator syntax:: - - BI ID EI - -Contents parser treats this genuine triplet as a single piece, producing two operands (dict and string) -followed by ``EI`` operator name.] - -Boxes ------ - -Boxes (rectangles) in PDF are roughly 4-number arrays, but with a special intent. -``pplib`` provides a basic interface for these special arrays:: - - typedef struct { - ppnum lx, ly, rx, ry; - } pprect; - -This type is used only by helper functions - PDF parser is not aware of the rectangle type. -To convert ``pparray`` to ``pprect``:: - - pprect * pparray_to_rect (pparray *array, pprect *rect); // returns rect or NULL - -In example:: - - pprect rect; - if (pparray_to_rect(array, &rect) != NULL) - ; // do something with rect - -To get some image bounding box:: - - pprect * ppdict_get_rect (ppdict *dict, const char *name, pprect *rect); - // eg. ppdict_get_rect(imagedict, "BBox", &rect) - -To get some page box:: - - pprect * ppdict_get_box (ppdict *dict, const char *name, pprect *rect); - // eg. ppdict_get_box(pagedict, "MediaBox", &rect) - -The later not only checks the pagedict, but also goes through parent page nodes. - -Transforms ----------- - -Transformations are given as 6-number arrays, but with a special intent. -``pplib`` provides a basic interface for these special arrays:: - - typedef struct { - ppnum xx, xy, yx, yy, x, y; - } ppmatrix; - -This type is used only by helper functions - PDF parser is not aware of the matrix type. -To convert ``pparray`` to ``ppmatrix``:: - - ppmatrix * pparray_to_matrix (pparray *array, ppmatrix *matrix); - -In example:: - - ppmatrix matrix; - if (pparray_to_matrix(array, &matrix) != NULL) - ; // do something with matrix - -To get the matrix from dict:: - - ppmatrix * ppdict_get_matrix (ppdict *dict, const char *name, ppmatrix *matrix); - // eg. ppdict_get_matrix(imagedict, "Matrix", &matrix) - -Errors handling ---------------- - -``pplib`` is not verbose, but might happen that it needs to log some error message, eg. when parsing -of some PDF boject fails due to invalid offsets. By default, ``pplib`` prints the message to stdout, eg.:: - - invalid 123 0 R object at offset 123123 - -To replace the default logger, you can provide your own:: - - void pplog_callback (pplogger_callback logger, void *alien); - -``pplogger_callback`` is a function:: - - void your_callback (const char *message, void *alien); - -In example, to redirect messages to stderr you may define a function:: - - void your_callback (const char *message, void *alien) - { - fprintf((FILE *)alien, "\nooops: %s\n", message); - } - -Then set the callback somewhere before loading documents:: - - pplog_callback(your_callback, stderr); - -(example 2 uses that). - -To set the default log messages prefix, eg. ``pplib:``, use:: - - int pplog_prefix (const char *prefix) - -Default is empty. The function succeeds if provided prefix is reasonably short (less then 32 bytes). diff --git a/Build/source/libs/pplib/pplib-src/doc/_build/html/_sources/ppapi-2.x.rst.txt b/Build/source/libs/pplib/pplib-src/doc/_build/html/_sources/ppapi-2.x.rst.txt deleted file mode 100644 index 250cd8fcd35..00000000000 --- a/Build/source/libs/pplib/pplib-src/doc/_build/html/_sources/ppapi-2.x.rst.txt +++ /dev/null @@ -1,937 +0,0 @@ - -``pplib`` 2.x -============= - -``pplib`` is a library for raw PDF access. It parses PDF documents and provides an interface to access document structures in C. - -C-API -===== - -Types ------ - -``pplib`` defines several C-types to represent PDF types: - -- ``ppbyte`` - char -- ``ppint`` - signed integer (``int64_t``) -- ``ppnum`` - real number (double) -- ``ppname`` - PDF name -- ``ppstring`` - PDF string -- ``pparray`` - PDF array -- ``ppdict`` - PDF dict -- ``ppstream`` - PDF stream -- ``ppref`` - PDF indirect reference -- ``ppobj`` - a container of all above - -Among ``ppint`` and ``ppnum``, we also use ``ppuint`` - unsigned integer (machine word, alias to ``size_t``). - -Other API types: - -- ``ppdoc`` - PDF document -- ``ppxref`` - cross-references table -- ``ppcontext`` - ... later -- ``pprect`` - rectangle -- ``ppmatrix`` - matrix - -Integer and number are as simple types. Names and strings used to be aliases to ``char *`` -in ``pplib 1.x``, now they are structures; all related API functions operate on pointers. -Other types (array, dict, stream, reference, object container, xref, doc) are C-structures, -and you operate it their pointers. So when you declare a simple type variable you say:: - - ppuint u; - ppnum n; - ... - -And when you declare a compound type you operate on pointers:: - - ppobj *obj; - ppname *name; - ppstring *string; - pparray *array; - ppdict *dict; - ppstream *stream; - ppref *ref; - ppdoc *pdf; - -Most of those C-types are defined in library header ``ppapi.h`` (complete types). Some others are incomplete -(eg. you can't say ``sizeof(ppdoc)`` or ``sizeof(ppxref)``). This is to avoid unnecesary dependencies in -the header. The library itself uses ``pplib.h`` header but for auxilary applications including a standalone -``ppapi.h`` header should be enough. - -``pplib`` was designed having **read-only** PDF access in mind. Even if some structure is completelly exposed, -so that you can directly access its members, you should treat them as read-only. I don't make them ``const`` because -then all variable declarations would need to be ``const``, which is annoying, and I'd need some trickery in the library -internals to unconst. Besides, nothing is really const for C type casts. - -Object ------- - -A common container for all elementary PDF object types is ``ppobj`` structure. ``ppobj`` has a type identifier -(integer) and union of values:: - - struct ppobj { - ppobjtp type; - union { - ppint integer; - ppnum number; - ppname *name; - ppstring *string; - pparray *array; - ppdict *dict; - ppstream *stream; - ppref *ref; - void *any; - }; - }; - -Object type is one of constants (enum):: - - PPNONE - PPNULL - PPBOOL - PPINT - PPNUM - PPNAME - PPSTRING - PPARRAY - PPDICT - PPSTREAM - PPREF - -The type determines the structure member you're allowed to access:: - - ppobj *obj; - ... - switch (obj->type) - { - case PPNONE: // shouldn't actually happen, indicates some failure - break; - case PPNULL: // valid PDF null object, no value - break; - case PPBOOL: // do something with obj->integer (ppint), value 0 or 1 - break; - case PPINT: // do something with obj->integer (ppint) - break; - case PPNUM: // do something with obj->number (ppnum) - break; - case PPNAME: // do something with obj->name (ppname *) - break; - case PPSTRING: // do something with obj->string (ppstring *) - break; - case PPARRAY: // do something with obj->array (pparray *) - break; - case PPDICT: // do something with obj->dict (ppdict *) - break; - case PPSTREAM: // do something with obj->stream (ppstream *) - break; - case PPREF: // do something with obj->ref (ppref *) - break; - } - -More often then not you know exactly what type of object value is expected, in which case -you may use one of the following macros:: - - // returns 1 if o->type is PPNULL - int ppobj_get_null(o) \ - - // if o->type is PPBOOL, sets int v to 0 or 1 and returns 1, 0 otherwise - int ppobj_get_bool(o, v) - - // if o->type is PPINT, sets ppint v and returns 1, 0 otherwise - int ppobj_get_int(o, v) - - // if o->type is PPINT and >= 0, sets ppuint v and returns 1, 0 otherwise - int ppobj_get_uint(o, v) - - // if o->type is PPNUM or PPINT, sets ppnum v and returns 1, 0 otherwise - int ppobj_get_num(o, v) - - // if o->type is PPNAME returns the name, NULL otherwise - ppname * ppobj_get_name(o) - - // if o->type is PPSTRING returns the string, NULL otherwise - ppstring * ppobj_get_string(o) - - // if o->type is PPARRAY returns the array, NULL otherwise - pparray * ppobj_get_array(o) - - // if o->type is PPDICT returns the dict, NULL otherwise - ppdict * ppobj_get_dict(o) - - // if o->type is PPSTREAM returns the stream, NULL otherwise - ppstream * ppobj_get_stream(o) - - // if o->type is PPREF returns the reference, NULL otherwise - ppref * ppobj_get_ref(o) - -Note the coercion from integer to real number, but not reverse. In practise, whenever you expect a real number, -you should also handle integer (eg. '1' used instead of '1.0' is pretty common in PDF). - -It is a common case that the object is given as an indirect reference, but what you actually -want is not the reference, but the object referred by it. Here is a helper for it:: - - // if o->type is PPREF, returns what the reference points, otherwise returns o - ppobj * ppobj_rget_obj(o) - -Also every ``ppobj_get_*`` macro has ``ppobj_rget_*`` counterpart that makes a check -for the expected type, but if the object is PPREF, it jumps to the target object. -So for example ``ppobj_rget_dict(obj)`` will return dict if ``obj`` is of type PPDICT -or if it is of type PPREF and ``obj->ref`` hosts an object of type PPDICT. - -Names ------ - -PDF names are represented as ``ppname`` pointer (``ppname`` used to be an alias to ``char *``, now it is a structure). -To access the name data:: - - ppbyte * ppname_data(name) // name->data, bytes array - -For convenient use in C, names are ``'\0'`` terminated. But to get the length of name better always use -``ppname_size()`` macro. ``ppname`` object knows its size, don't use ``strlen()``:: - - size_t ppname_size(ppname name); // name->size, the length of name in bytes - -In current implementation names are not hashed anyhow, so name-to-name comparison is not smarter than ``memcmp()``. -Use macros:: - - int ppname_is(ppname name, "literal"); // to compare ppname with C-literal string - int ppname_eq(ppname name, ppname other); // to compare ppname with a different name - -If you use ``pplib`` to parse contents streams, you may need to distinguish names from operators -(more precisely executable names). Names in PDF are preceeded by '/', executable names aren't. In both -cases PDF parser will produce ``ppname`` but the result can be distingushed with:: - - int ppname_exec(ppname name); // macro, returns non-zero if the name is executable - -Names are kept in their raw form, with possible PDF specific escapes (in text below we call it **encoded** form). -Leading '/' is omitted. One may need a decoded name, with no PDF escapes. -A pair of functions provides a simple interface to switch between those two forms:: - - // these helpers rely on name->alterego member - ppname * ppname_decoded (ppname *name); // returns decoded (unescaped) form of the name - ppname * ppname_encoded (ppname *name); // returns encoded (escaped) form of the name - ppbyte * ppname_decoded_data (ppname *name); - ppbyte * ppname_encoded_data (ppname *name); - -In pretty most cases a PDF name contains only letters (no special characters, no escapes), so decoded and encoded forms are identical. -In that case both functions simply return the argument. It is ok to call ``ppname_decoded()`` on already decoded form -and ``ppname_encoded()`` on already encoded form. Both forms are produced by PDF objects parser, so accessing ``ppname`` alter ego -in whatever direction needs no extra decoding or allocation costs (the cost is paid by parser). - -String ------- - -PDF strings have the same internal construction as names, so most of names description above applies to strings as well. -``ppstring`` is a structure (used to be an alias to ``char *``). ``string->data`` is ``\0``-terminated c-array of ``ppbytes``. -To get the data:: - - ppbyte * ppstring_data(ppstring *string); // string->data, macro - -To get the size of the string:: - - size_t ppstring_size(ppstring *string); // macro, returns the length of the string in bytes - -Strings are provided in their raw form, preserving PDF specific escapes, but with no -``()`` or ``<>`` delims. To distinguish plain strings from hex strings:: - - int ppstring_hex(ppstring string); // macro, returns non zero if hex string - -Or if you prefer:: - - switch (ppstring_type(string)) - { - case PPSTRING_PLAIN: // literal string, surrounded by ``(`` and ``)`` in PDF - break; - case PPSTRING_BASE16: // hex string, surrounded by ``<`` and ``>`` in PDF - break; - case PPSTRING_BASE85: // base85 string surrounded by ``<~`` and ``~>`` in PDF - break; - } - -The last is actually Postscript specific, not used in PDF, but I think it might appear in contents streams... -No matter how the string is given in PDF (plain or hex), here are two functions to -switch between encoded and decoded strings forms:: - - ppstring * ppstring_decoded (ppstring *string); // returns decoded string possibly with PDF escapes - ppstring * ppstring_encoded (ppstring *string); // returns encoded string with no PDF escapes - ppbyte * ppstring_decoded_data (ppstring *string); - ppbyte * ppstring_encoded_data (ppstring *string); - -For hex strings, encoded form contains hex digits, while decoded form contains arbitrary bytes (the result of hex decoding). -Plain strings usually contains printable ASCII characters, but they might contain any binary data. -As with names, objects parser produces both forms. The raw form with PDF escapes (or raw hex form) the main one. -Eg. when you access ``obj->string`` you always get the encoded form. At any moment you can switch to its alter ego. - -No matter if the string is plain or hex, if its first two bytes (decoded) are UTF16 BOM, the string is unicode. -``ppstring`` object *knows* it is unicode or not:: - - switch (ppstring_utf(string)) - { - case PPSTRING_UTF16LE: // unicode string, utf16le - break; - case PPSTRING_UTF16BE: // unicode string, utf16be - break; - default: // no unicode - } - -Or simply:: - - if (ppstring_utf(string) != 0) { - // handle unicode string - } - -If the string is unicode, BOM remains the part of the string -- ``pplib`` parser does not strip it. -Unicode or not, encoded or decoded, strings are always C-arrays of bytes and ``ppstring_size()`` -always returns the size in bytes. - -Array ------ - -PDF arrays are represented as ``pparray`` type, which is C-array of ``ppobj`` structures. -To get the size:: - - size_t pparray_size(pparray *array) // macro, returns the number of array items - -To get ``ppobj *`` at a given index:: - - ppobj * pparray_at(array, index) // macro, returns ppobj * (no index check) - ppobj * pparray_get(array, index) // macro, returns ppobj * or NULL (with index check) - ppobj * pparray_get_obj (pparray *array, size_t index); // function equiv to pparray_get() - -Iterating over array elements:: - - pparray *array; - size_t index, size; - ppobj *obj; - for (size = pparray_size(array), pparray_first(array, index, obj); index < size; pparray_next(index, obj)) - { - // do something with index and obj - } - -There is no magic first/next macros, just iteration over pointers. One could also use something like:: - - for (index = 0, size = array->size; index < size; ++index) - { - obj = pparray_at(array, index); - // do something with index and obj - } - -When getting values from array and expecting a result of known type, use one of the following:: - - int pparray_get_bool (pparray *array, size_t index, int *v); // get boolean value - int pparray_get_int (pparray *array, size_t index, ppint *v); // get ppint value - int pparray_get_uint (pparray *array, size_t index, ppuint *v); // get ppuint value - int pparray_get_num (pparray *array, size_t index, ppnum *v); // get ppnum value - ppname * pparray_get_name (pparray *array, size_t index); // get ppname * value - ppstring * pparray_get_string (pparray *array, size_t index); // get ppstring * value - pparray * pparray_get_array (pparray *array, size_t index); // get pparray * value - ppdict * pparray_get_dict (pparray *array, size_t index); // get ppdict * value - ppref * pparray_get_ref (pparray *array, size_t index); // get ppref * value - -As with ``ppobj_get_*`` suite, numeric types getters set the value of a given type and returns 1, if the type matches. -Otherwise sets nothing and returns 0. Other getters return the value if the type matches, or NULL. - -Every function from ``pparray_get_*`` suite have its ``pparray_rget_*`` counterpart -that dereferences indirect objects (as explained for ``ppobj_rget_*`` getters). Note that -there is no ``pparray_get_stream()`` function, as streams in PDF are always indirect -(may only reside in ``ref->object.stream``). To get the stream from array use:: - - ppstream * pparray_rget_stream (pparray *array, size_t index); - -Dict ----- - -PDF dicts are represented as ``ppdict`` structure, which is C-array of ``ppobj`` with parallel -C-array of ``ppname`` pointers. To get the size of a dict:: - - size_t ppdict_size(ppdict *dict) // macro, returns the number of key-val pairs - -To get the value at a given index (integer):: - - ppobj * ppdict_at(ppdict *dict, index) // macro, no index bounds check - -To get the name (key) at a given index:: - - ppname * ppdict_key(ppdict *dict, index) // macro, no index bounds check - -To iterate over dict key-val pairs:: - - ppdict *dict; - ppname **pkey; - ppobj *obj; - - for (ppdict_first(dict, pkey, obj); *pkey != NULL; ppdict_next(pkey, obj)) - { - // do something with *pkey and obj - } - -There is no magic in first/next macros, just iteration through keys and values lists pointers. -For convenient iteration, a list of keys is terminated with NULL, so in the code above ``*pkey != NULL`` -is used as the loop condition. One may also iterate via indices:: - - ppdict *dict; - size_t index, size; - ppname *key; - ppobj *obj; - for (index = 0, size = ppdict_size(dict); index < size; ++index) - { - key = ppdict_key(dict, index); - obj = ppdict_at(dict, index); - // do something with key and obj - } - -To get the object associated with a given name, use one of the following:: - - ppobj * ppdict_get_obj (ppdict *dict, const char *name); - int ppdict_get_bool (ppdict *dict, const char *name, int *v); - int ppdict_get_int (ppdict *dict, const char *name, ppint *v); - int ppdict_get_uint (ppdict *dict, const char *name, ppuint *v); - int ppdict_get_num (ppdict *dict, const char *name, ppnum *v); - ppname ppdict_get_name (ppdict *dict, const char *name); - ppstring ppdict_get_string (ppdict *dict, const char *name); - pparray * ppdict_get_array (ppdict *dict, const char *name); - ppdict * ppdict_get_dict (ppdict *dict, const char *name); - ppref * ppdict_get_ref (ppdict *dict, const char *name); - -Note that all getters accepts ``const char *`` as key, so it is ok to say:: - - ppdict_rget_dict(dict, "Resources"); - -(the most common use I guess). But to use ``ppname`` object as a key, one have to -use data member:: - - ppdic_rget_dict(dict, name->data); // ppname *name - -Every ``ppdict_get_*`` getter has ``ppdict_rget_*`` counterpart that dereferences -indirect objects if necessary. Note that there is no ``ppdict_get_stream()`` function, -but there is:: - - ppstream * ppdict_rget_stream (ppdict *dict, const char *name); - -So far dicts comes with no names mapping, so by-name dict accessors perform a linear search -through the keys list. PDF dicts are usually small. - -Stream ------- - -PDF streams are represented as ``ppstream`` objects. To get the stream dict:: - - ppdict * ppstream_dict(ppstream *stream) // macro - -To read the stream data:: - - uint8_t * ppstream_first (ppstream *stream, size_t *size, int decode); - uint8_t * ppstream_next (ppstream *stream, size_t *size); - void ppstream_done (ppstream *stream); - -Both ``first` and ``next`` functions return a chunk of stream data and sets the ``size`` of the chunk. -``decode`` parameter tell the reader to decompress the stream (1) or return raw (0). A call to ``ppstream_next()`` -must be preceeded by ``ppstream_first()``. Once you're done with the stream, you have to call ``ppstream_done()``, -no matter if the stream has been read to the end or not. The stream data iterator in use:: - - uint8_t *data; - size_t size; - ppstream *stream; - int decode = 1; // 1 - get decompressed, 0 - get raw - - for (data = ppstream_first(stream, &size, decode); data != NULL; data = ppstream_next(stream, &size)) - { - // do something with data and its size - } - ppstream_done(stream); - -Every subsequent iterator call invalidates the previous reader output, so you have to utilize the returned chunk -of data just after you ot that. So the following is wrong:: - - data1 = ppstream_first(stream, &size, 1); - data2 = ppstream_next(stream, &size); - data3 = ppstream_next(stream, &size); - some_output(data1, size); - some_output(data2, size); - -The reader calls usually return the same pointer to internal buffer, just filled with a different data. -``pplib`` allocates reasonably large buffer and fills that buffer on subsequent calls to the reader. - -If the source stream has no compression, using both ``decode == 1`` and ``decode == 0`` should give the same result. -You can check if the stream is actually compressed with:: - - ppstream_compressed(stream) // macro, returns non zero if /Filter is present - -It might be necessary to load the entire stream data at once:: - - uint8_t * ppstream_all (ppstream *stream, size_t *size, int decode); - -If the initial buffer size is insufficient, it grows until the entire stream data is loaded. You must call -``ppstream_done(stream)`` after using returned data. - -``ppstream_done()`` doesn't invalidate the stream object, it just closes its internal reader. -The stream itself remains a valid object (eg. one can read it again if necessary), -but the reader buffer is released. It is actually not freed but kept for future the reuse with that on some other stream, -but you still need to mark it ready for reuse to avoid allocating a separate buffer for every stream you're going to read. - -Stream data readers will return ``NULL`` if you haven't close the previous reader process with ``ppstream_done()``. All below is wrong:: - - data1 = ppstream_all(stream, &size, 1); - data2 = ppstream_all(stream, &size, 1); // data2 == NULL - // or - data1 = ppstream_first(stream, &size, 1); - data2 = ppstream_first(stream, &size, 1); // data2 == NULL - // or - data1 = ppstream_first(stream, &size, 1); - data2 = ppstream_all(stream, &size, 1); // data2 == NULL - -To avoid unnecessary dependencies, ``pplib`` does not support image filters (``/DCT``, ``/JPX``, ``/JBIG``, ``/CCITT``). -But it is ok to read the stream with ``decode`` set to 1 on such streams. ``pplib`` assumes that the image is the -final/target stream form and just returns it as-is. Eg. in the case of JPEG (``/DCT`` filtered) image both calls should -give the same results:: - - ppstream_all(jpegstream, &jpegsize, 0); // don't decode, return what's there - ppstream_all(jpegstream, &jpegsize, 1); // decode but found image filter, effectively the same - -A bit more about streams memory. As mentioned, ``pplib`` allocates buffers for stream readers. After ``ppstream_done()``, -the stream no longer *owns* the buffer space. But the buffer may remain allocated, to be reused with future readers. -``pplib`` keeps a pool of several buffers. This means, that when you use stream readers, ``pplib`` eats -some memory (1MB or so) that is not freed, even if no streams are used. And even if you free all objects. -If you suffer from this, you can optionally use a pair of functions:: - - void ppstream_init_buffers (void); - void ppstream_free_buffers (void); - -The first initializes buffers pool, unless done so far. Currently ``pplib`` cares of it before opening every stream reader, -so it is not obligatory. The second frees a pool of buffers. The intended use is to call ``ppstream_init_buffers()`` once -as kind of library initializer and to call ``ppstream_free_buffers()`` once, as the library finalizer. - -Filters -------- - -``ppstream`` knows its filter(s) and keps it as ``stream->filter``:: - - // ppstream *stream; - ppstream_filter *info = &stream->filter; - -``ppstream_filter`` is the following structure:: - - typedef struct { - ppstreamtp *filters; // c-array of filter identifiers (enum integers) - ppdict **params; // c-array of ppdict pointers - size_t count; // number of filters, length of the arrays (typically 1) - } ppstream_filter; - -If ``count > 0`` then ``filters`` member is not NULL. Filters array keeps integer constants:: - - PPSTREAM_BASE16 /* /ASCIIHexDecode */ - PPSTREAM_BASE85 /* /ASCII85Decode */ - PPSTREAM_RUNLENGTH /* /RunLengthDecode */ - PPSTREAM_FLATE /* /FlateDecode */ - PPSTREAM_LZW /* /LZWDecode */ - PPSTREAM_CCITT /* /CCITTFaxDecode */ - PPSTREAM_DCT /* /DCTDecode */ - PPSTREAM_JBIG2 /* /JBIG2Decode */ - PPSTREAM_JPX /* /JPXDecode */ - PPSTREAM_CRYPT /* /Crypt */ - -Params array keeps corresponding filter parameters (``/DecodeParms``) if present. ``params`` member is not NULL -if ``count > 0`` and the stream dict has ``/DecodeParms`` entry. Even if ``params`` is there, -for every N-th filter, ``params[N]`` may be NULL (corresponding to PDF ``null``). - -``stream->filter`` keeps the source stream filter information, which may not correspond to the result of stream readers -(``ppstream_first()``, ``ppstream_next()``, ``ppstream_all()``). The get the filters info relevant to the result from readers:: - - void ppstream_filter_info (ppstream *stream, ppstream_filter *info, int decode); - -The function fills ``ppstream_filter`` structure according to the expected result from stream readers (example 3 shows -how to use it to reconstruct ``/Filter`` and ``/DecodeParms`` when copying the stream to some other PDF). - -To convert filter identifier (``ppstreamtp``) to a corresponding PDF filter name:: - - const char * ppstream_filter_name[]; - -To covert ``ppname`` to filter identifier:: - - int ppstream_filter_type (ppname filtername, ppstreamtp *filtertype); - // returns 1 and sets filtertype if filtername is the proper filter name - -Additional information about the stream can be fetched from macros:: - - ppstream_compressed(stream) /* stream->flags & (PPSTREAM_FILTER|PPSTREAM_IMAGE) */ - ppstream_filtered(stream) /* stream->flags & PPSTREAM_FILTER */ - ppstream_image(stream) /* stream->flags * PPSTREAM_IMAGE */ - -``stream->flags`` is a binary sum of the following:: - - PPSTREAM_FILTER /* set iff the stream filters list has one of: BASE16, BASE85, RUNLENGTH, FLATE, LZW */ - PPSTREAM_IMAGE /* set iff the stream filters list has one of: CCITT, DCT, JBIG2, JPX */ - PPSTREAM_ENCRYPTED /* set iff the stream is encrypted */ - PPSTREAM_ENCRYPTED_OWN /* set iff the stream has own CRYPT filter */ - -Note that ``PPSTREAM_COMPRESSED`` is not there any longer, use ``ppstream_compressed()`` instead. -And there is some more, see ``ppapi.h``. - -Ref ---- - -Indirect objects are represented as ``ppref`` structure. To get the object that the -reference refers to:: - - ppobj * ppref_obj(ppref *ref) // macro - -``ppref`` structure also keeps the reference number and version, a pointer to cross reference table it belongs -to and others, but I guess you won't need anything but the referenced object. ``pplib`` parser resolves references -on-fly. So if there is a dict with indirect objects:: - - << - /Type /Page - /Resources 123 0 R - ... - >> - -the parser will produce ``ppdict`` with ``Resources`` key pointing the proper ``ppref *`` value. -If you need more, access ``ppref`` members:: - - struct ppref { - ppobj object; // target object - ppuint number, version; // identifiers - size_t offset; // file offset (useless for you, may be zero for compressed objects) - ppuint length; // the length of the original object data - ppxref *xref; // cross reference table it belongs to - }; - - -XRef ----- - -Cross reference table is exposed as ``ppxref`` (incomplete type, you can only oprate on its pointer). -To get top document xref:: - - ppxref * ppdoc_xref (ppdoc *pdf); - -To get previous (older) xref:: - - ppxref * ppxref_prev (ppxref *xref); - -To find an object of a given refnumber:: - - ppref * ppxref_find (ppxref *xref, ppuint refnumber); - -[Note: since pplib v0.98 in case of documents with incremental update, ``ppxref_find()`` returns -the newest available version of a given object rather than the object in a given body.] - -PDF ---- - -PDF document is represented as ``ppdoc`` structure (incomplete type, you can only operate on its pointer). -To load a document from file:: - - ppdoc * ppdoc_load (const char *filename); - -To load a document from file handle:: - - ppdoc * ppdoc_filehandle (FILE *file, int closefile); // closefile 1 to fclose() on end - -To load a document from memory data:: - - ppdoc * ppdoc_mem (const void *data, size_t size); - -The data is assumed to be a buffer allocated with ``malloc`` - it is freed when destroying ``ppdoc``. - -Both loaders returns ``NULL`` on failure. - -To free ``ppdoc`` and all objects it refers to:: - - void ppdoc_free (ppdoc *pdf); - -So far we haven't mention about any explicit object reclaimers. There are no dedicated ``free`` functions -for other objects. You don't allocate or free objects yourself. ``ppdoc`` object is an owner of all -beings it refers to. It also means that every object described so far is alive as long as the containing -``ppdoc`` is alive. - -To access main PDF dicts:: - - ppdict * ppdoc_trailer(ppdoc *pdf); // returns top xref trailer dict - ppdict * ppdoc_catalog(ppdoc *pdf); // returns catalog referred from the trailer - ppdict * ppdoc_info(ppdoc *pdf); // returns info dict referred from the trailer - -To get the PDF version:: - - const char * ppdoc_version_string (ppdoc *pdf); // version string - int ppdoc_version_number (ppdoc *pdf, int *minor); // minor and major numbers - -To get the file size of the source PDF document:: - - size_t ppdoc_file_size (ppdoc *pdf); - -To get the number of objects in all xrefs:: - - ppuint ppdoc_objects (ppdoc *pdf); - -To get the approx usage of memory:: - - size_t ppdoc_memory (ppdoc *pdf, size_t *waste); - -Encryption ----------- - -``pplib`` handles encrypted (password protected) documents. If a document is encrypted, most of strings and streams are ciphered. -In that form they are unreadable and rather useless, you can't even rewrite such strings/streams as-is to a different PDF output. -It is a common practise to *protect* documents with an empty password. Such documents remain readable in Acrobat (just opens them without prompting -for a password), but some features (eg. printing) may restricted by the application. - -When ``pplib`` detects encryption, it follows Acrobat approach and first tries an empty password. If it succeeds, ``pplib`` proceeeds normally, providing -an access to decrypted strings and streams, as if they weren't ciphered. If the document is protected with non-empty password, ``pplib`` gives -a way to provide a password and proceed. Until you provide a password, ``ppdoc`` object returned by ``ppdoc_load()`` function has all object wntries -set to ``null``. - -After loading a document you should check encryption status with:: - - ppcrypt_status ppdoc_crypt_status (ppdoc *pdf); - -``ppcrypt_status`` (integer) may have the following values: - - ``PPCRYPT_NONE`` - no encryption, go ahead - ``PPCRYPT_DONE`` - encryption present but password succeeded, go ahead - ``PPCRYPT_PASS`` - encryption present, need non-empty password - ``PPCRYPT_FAIL`` - invalid or unsupported encryption (eg. undocumented in pdf spec) - -If a password is needed, you can provide one with:: - - ppcrypt_status ppdoc_crypt_pass (ppdoc *pdf, const void *userpass, size_t userpasslength, - const void *ownerpass, size_t ownerpasslength); - -Well, yes, there are actually two passwords in encrypted documents. Relation between them is obscure to me, but enough -to know that having one of them is enough to decrypt the document. If you know the password, you probably mean -``userpass``, in which case you should put ``NULL`` as ``ownerpass``. The function returns ``PPCRYPT_DONE`` if the password -succeeds and the previous status otherwise. Your custom loader function may look like that:: - - ppdoc *pdf; - pdf = ppdoc_load("file.pdf"); - if (pdf == NULL) - return NULL; - switch (ppdoc_crypt_status(pdf)) - { - case PPCRYPT_NONE: - case PPCRYPT_DONE: - return pdf; - case PPCRYPT_PASS: - if (ppdoc_crypt_pass(pdf, "dummy", 5, NULL, 0) == PPCRYPT_DONE || - ppdoc_crypt_pass(pdf, NULL, 0, "dummy", 5) == PPCRYPT_DONE) - return pdf; - printf("sorry, password needed\n"); - ppdoc_free(pdf); - return NULL; - case PPCRYPT_FAIL: - printf("sorry, encryption failed\n"); - ppdoc_free(pdf); - return NULL; - } - -[If you get ``PPCRYPT_FAIL`` it might mean *I failed*, so treat as a bug.] - -If you'd like to know what permissions are given/restricted to encrypted document:: - - ppint ppdoc_permissions (ppdoc *pdf); - -Returned value can be queried with the following binary flags (you can verify with Acrobat *File -> Properties -> Security* tab):: - - PPDOC_ALLOW_PRINT // printing - PPDOC_ALLOW_MODIFY // filling form fields, signing, creating template pages - PPDOC_ALLOW_COPY // copying, copying for accessibility - PPDOC_ALLOW_ANNOTS // filling form fields, copying, signing - PPDOC_ALLOW_EXTRACT // contents copying for accessibility - PPDOC_ALLOW_ASSEMBLY // (no effect) - PPDOC_ALLOW_PRINT_HIRES // (no effect) - -``pplib`` does absolutelly nothing with permissions, it cares only to decrypt the document. As mentioned, encryption applies to strings -and streams. ``pplib`` decrypt strings when parsing document objects, so the result you get is *normal* (not ciphered). -Streams are decrypted whenever you access them. Even if you ask for a raw stream data, you'll get a raw (compressed) stream, but decrypted. -So except the check to ``ppdoc_crypt_status()``, you shouldn't bother about encryption. - -In encrypted documents most of streams are encrypted. To check if a given stream is encrypted:: - - ppstream_encrypted(stream) // macro, returns non-zero if encrypted - -Encryption is independent from compression, don't confuse with ``ppstream_compressed()`` - -Pages ------ - -Several helpers to deal with pages. To get the number of pages:: - - ppuint ppdoc_page_count (ppdoc *pdf); - -To access the root pages tree node:: - - ppref * ppdoc_pages(ppdoc *pdf); - -To get the page reference at a given index:: - - ppref * ppdoc_page (ppdoc *pdf, ppuint index); - -``index`` is a page number. First page has number 1. For index out of bounds ``ppdoc_page()`` returns NULL. -Iterating over pages using index from 1 to ``ppdoc_page_count()`` and calling ``ppdoc_page()`` on each iteration -would be suboptimal. Here is a dedicted iterator for this:: - - ppref * ppdoc_first_page (ppdoc *pdf); - ppref * ppdoc_next_page (ppdoc *pdf); - -The iterator in use:: - - ppdoc *pdf; - ppref *ref; - ppdict *dict; - int pageno; - - pdf = ppdoc_load("file.pdf"); - for (ref = ppdoc_first_page(pdf), pageno = 1; ref != NULL; ref = ppdoc_next_page(pdf), ++pageno) - { - dict = ppref_obj(obj)->dict; // take for granted it is a dict - // do something with the page dict - } - -Functions related to pages return ``ppref *`` ensured to contain dict object, so you don't need sanity -type checks here. - -Contents --------- - -PDF page contents can be given as a stream or array of streams. Here is a convenience iterator over page -contents streams:: - - ppstream * ppcontents_first (ppdict *dict); - ppstream * ppcontents_next (ppdict *dict, ppstream *stream); - -A complete example of contents stream parser use is given below (example 2). -But before we get there, we need to introduce ``ppcontext`` object. Conceptually, -``ppcontext`` is an owner (memory handler) of objects created on demand (beyond the ``ppdoc``). -So far used only with contents stream parser, which might produce quite some data that we want -to release just after used. To create a new context:: - - pcontext * ppcontext_new (void); - -It initializes a new context and its internal memory heap, taking about 64kB on start. After that, -the context is ready to produce objects (contents parsing functions below). Once objects produced -from a given context are no longer needed:: - - void ppcontext_done (ppcontext *context); - -It restores the context to its initial state, as after ``ppcontext_new()``. It means that the context -is ready to produce another bunch of beings (in the example below, all objects from the next page contents). -Once the context is not needed anymore:: - - void ppcontext_free (ppcontext *context); - -Now, contents stream parser functions take the context as an argument. Iterator form of contents stream parser -that allows to process the contents operator by operator:: - - ppobj * ppcontents_first_op (ppcontext *context, ppstream *stream, size_t *psize, ppname *pname); - ppobj * ppcontents_next_op (ppcontext *context, ppstream *stream, size_t *psize, ppname *pname); - -Returned ``ppobj *`` is a pointer to operands list. ``*psize`` is the number of operands on stack. -The operator itself is stored as ``*pname``. - -To parse the entire contents stream at once with no stop at every operator:: - - ppobj * ppcontents_parse (ppcontext *context, ppstream *stream, size_t *psize); - -Returns probably quite long list of all parsed objects (operands and operatos) in one piece. -The number of objects is stored to ``*psize``. - -[Contents may contain so called inline images, that breaks a simple scheme of operands / operator syntax:: - - BI ID EI - -Contents parser treats this genuine triplet as a single piece, producing two operands (dict and string) -followed by ``EI`` operator name.] - -Boxes ------ - -Boxes (rectangles) in PDF are roughly 4-number arrays, but with a special intent. -``pplib`` provides a basic interface for these special arrays:: - - typedef struct { - ppnum lx, ly, rx, ry; - } pprect; - -This type is used only by helper functions - PDF parser is not aware of the rectangle type. -To convert ``pparray`` to ``pprect``:: - - pprect * pparray_to_rect (pparray *array, pprect *rect); // returns rect or NULL - -In example:: - - pprect rect; - if (pparray_to_rect(array, &rect) != NULL) - ; // do something with rect - -To get some image bounding box:: - - pprect * ppdict_get_rect (ppdict *dict, const char *name, pprect *rect); - // eg. ppdict_get_rect(imagedict, "BBox", &rect) - -To get some page box:: - - pprect * ppdict_get_box (ppdict *dict, const char *name, pprect *rect); - // eg. ppdict_get_box(pagedict, "MediaBox", &rect) - -The later not only checks the pagedict, but also goes through parent page nodes. - -Transforms ----------- - -Transformations are given as 6-number arrays, but with a special intent. -``pplib`` provides a basic interface for these special arrays:: - - typedef struct { - ppnum xx, xy, yx, yy, x, y; - } ppmatrix; - -This type is used only by helper functions - PDF parser is not aware of the matrix type. -To convert ``pparray`` to ``ppmatrix``:: - - ppmatrix * pparray_to_matrix (pparray *array, ppmatrix *matrix); - -In example:: - - ppmatrix matrix; - if (pparray_to_matrix(array, &matrix) != NULL) - ; // do something with matrix - -To get the matrix from dict:: - - ppmatrix * ppdict_get_matrix (ppdict *dict, const char *name, ppmatrix *matrix); - // eg. ppdict_get_matrix(imagedict, "Matrix", &matrix) - -Errors handling ---------------- - -``pplib`` is not verbose, but might happen that it needs to log some error message, eg. when parsing -of some PDF boject fails due to invalid offsets. By default, ``pplib`` prints the message to stdout, eg.:: - - invalid 123 0 R object at offset 123123 - -To replace the default logger, you can provide your own:: - - void pplog_callback (pplogger_callback logger, void *alien); - -``pplogger_callback`` is a function:: - - void your_callback (const char *message, void *alien); - -In example, to redirect messages to stderr you may define a function:: - - void your_callback (const char *message, void *alien) - { - fprintf((FILE *)alien, "\nooops: %s\n", message); - } - -Then set the callback somewhere before loading documents:: - - pplog_callback(your_callback, stderr); - -(example 2 uses that). - -To set the default log messages prefix, eg. ``pplib:``, use:: - - int pplog_prefix (const char *prefix) - -Default is empty. The function succeeds if provided prefix is reasonably short (less then 32 bytes). diff --git a/Build/source/libs/pplib/pplib-src/doc/_build/html/_sources/ppapi.rst.txt b/Build/source/libs/pplib/pplib-src/doc/_build/html/_sources/ppapi.rst.txt deleted file mode 100644 index 5d1d2883e57..00000000000 --- a/Build/source/libs/pplib/pplib-src/doc/_build/html/_sources/ppapi.rst.txt +++ /dev/null @@ -1,937 +0,0 @@ - -``pplib`` -========= - -``pplib`` is a library for raw PDF access. It parses PDF documents and provides an interface to access document structures in C. - -C-API -===== - -Types ------ - -``pplib`` defines several C-types to represent PDF types: - -- ``ppint`` - signed integer (``int64_t``) -- ``ppnum`` - real number (double) -- ``ppname`` - PDF name -- ``ppstring`` - PDF string -- ``pparray`` - PDF array -- ``ppdict`` - PDF dict -- ``ppstream`` - PDF stream -- ``ppref`` - PDF indirect reference -- ``ppobj`` - a container of all above - -Among ``ppint`` and ``ppnum``, we also use ``ppuint`` - unsigned integer (machine word, alias to ``size_t``). - -Other API types: - -- ``ppdoc`` - PDF document -- ``ppxref`` - cross-references table -- ``ppcontext`` - ... later -- ``pprect`` - rectangle -- ``ppmatrix`` - matrix - -Integer, number, name and string are treated as simple types. -Names and strings are actually C-structures, but exposed to API as typedefs to ``const char *``. -Other types (array, dict, stream, reference, object container, xref, PDF) are C-structures, -and you operate it their pointers. So when you declare a simple type variable you say:: - - ppuint u; - ppnum n; - ppname name; - ppstring string; - ... - -And when you declare a compound type you operate on pointers:: - - ppobj *obj; - pparray *array; - ppdict *dict; - ppstream *stream; - ppref *ref; - ppdoc *pdf; - -Some of those C-types are defined in library header ``ppapi.h`` (complete types). Some others are incomplete -(eg. you can't say ``sizeof(ppdoc)`` or ``sizeof(ppxref)``). This is to avoid unnecesary dependencies in -the header. [At some points it's not clear to me what to hide and what to expose, will see.] The library itself -uses ``pplib.h`` but for auxilary applications including a standalone ``ppapi.h`` header should be enough. - -``pplib`` was designed having **read-only** PDF access in mind. Even if some structure is completelly exposed, -so that you can directly access its members, you should treat them as read-only. I don't make them ``const`` because -then all variable declarations would need to be ``const``, which is annoying, and I'd need some trickery in the library -internals to unconst. Besides, nothing is really const for C type casts. - -Object ------- - -A common container for all elementary PDF object types is ``ppobj`` structure. ``ppobj`` has a type identifier -(integer) and union of values:: - - struct ppobj { - ppobjtp type; - union { - ppint integer; - ppnum number; - ppname name; - ppstring string; - pparray *array; - ppdict *dict; - ppstream *stream; - ppref *ref; - void *any; - }; - }; - -Object type is one of constants (enum):: - - PPNONE - PPNULL - PPBOOL - PPINT - PPNUM - PPNAME - PPSTRING - PPARRAY - PPDICT - PPSTREAM - PPREF - -The type determines the structure member you're allowed to access:: - - ppobj *obj; - ... - switch (obj->type) - { - case PPNONE: // shouldn't actually happen, indicates some failure - break; - case PPNULL: // valid PDF null object, no value - break; - case PPBOOL: // do something with obj->integer (ppint), value 0 or 1 - break; - case PPINT: // do something with obj->integer (ppint) - break; - case PPNUM: // do something with obj->number (ppnum) - break; - case PPNAME: // do something with obj->name (ppname) - break; - case PPSTRING: // do something with obj->string (ppstring) - break; - case PPARRAY: // do something with obj->array (pparray *) - break; - case PPDICT: // do something with obj->dict (ppdict *) - break; - case PPSTREAM: // do something with obj->stream (ppstream *) - break; - case PPREF: // do something with obj->ref (ppref *) - break; - } - -More often then not you know exactly what type of object value is expected, in which case -you may use one of the following macros:: - - // returns 1 if o->type is PPNULL - int ppobj_get_null(o) \ - - // if o->type is PPBOOL, sets int v to 0 or 1 and returns 1, 0 otherwise - int ppobj_get_bool(o, v) - - // if o->type is PPINT, sets ppint v and returns 1, 0 otherwise - int ppobj_get_int(o, v) - - // if o->type is PPINT and >= 0, sets ppuint v and returns 1, 0 otherwise - int ppobj_get_uint(o, v) - - // if o->type is PPNUM or PPINT, sets ppnum v and returns 1, 0 otherwise - int ppobj_get_num(o, v) - - // if o->type is PPNAME returns the name, NULL otherwise - ppname ppobj_get_name(o) - - // if o->type is PPSTRING returns the string, NULL otherwise - ppstring ppobj_get_string(o) - - // if o->type is PPARRAY returns the array, NULL otherwise - pparray * ppobj_get_array(o) - - // if o->type is PPDICT returns the dict, NULL otherwise - ppdict * ppobj_get_dict(o) - - // if o->type is PPSTREAM returns the stream, NULL otherwise - ppstream * ppobj_get_stream(o) - - // if o->type is PPREF returns the reference, NULL otherwise - ppref * ppobj_get_ref(o) - -Note the coercion from integer to real number, but not reverse. In practise, whenever you expect a real number, -you should also handle integer (eg. '1' used instead of '1.0'). - -It is a common case that the object is given as an indirect reference, but what you actually -want is not the reference, but the object referred by it. Here is a helper for it:: - - // if o->type is PPREF, returns what the reference points, otherwise returns o - ppobj * ppobj_rget_obj(o) - -Also every ``ppobj_get_*`` macro has ``ppobj_rget_*`` counterpart that makes a check -for the expected type, but if the object is PPREF, it jumps to the target object. -So for example ``ppobj_rget_dict(obj)`` will return dict if ``obj`` is of type PPDICT -or if it is of type PPREF and ``obj->ref`` hosts an object of type PPDICT. - -Names ------ - -PDF names are represented as ``ppname``. -I find it convenient to have ``ppname`` type pretending ``const char *``. This allows to use ``ppname`` -in all C-style string functions like ``printf("%s", name)``. - -Be aware, however, that ``ppname`` is actually a C-structure. It is perfectly ok to cast ``ppname`` to ``const char *``:: - - ppname name; - ... - (const char *)name; - -But reverse is forbidden:: - - const char *cstr = "cstring"; - ... - (ppname)cstr; // expect segmentation fault soon - -For convenient use in C, names are ``'\0'`` terminated. But to get the length of name better always use -``ppname_size()`` macro. ``ppname`` object knows its size, don't use ``strlen()``:: - - size_t ppname_size(ppname name); // macro, returns length of name in bytes - -In current implementation names are not hashed anyhow, so name-to-name comparison is not smarter than ``memcmp()``. -Use macros:: - - int ppname_is(ppname name, "literal"); // to compare ppname with C-literal string - int ppname_eq(ppname name, ppname other); // to compare ppname with a different name - -If you'll use ``pplib`` to parse contents streams, you may need to distinguish names from operators -(more precisely executable names). Names in PDF are preceeded by '/', executable names aren't. In both -cases PDF parser will produce ``ppname`` but can be distingushed with:: - - int ppname_exec(ppname name); // returns non-zero if name is executable - -Names are kept in their raw form, with possible PDF specific escapes (in text below we call it **encoded** form). -Leading '/' is omitted, though. One may need a decoded name, with no PDF escapes. -A pair of functions provides a simple interface to switch between those two forms:: - - ppname ppname_decoded (ppname name); // returns decoded (unescaped) form of the name - ppname ppname_encoded (ppname name); // returns encoded (escaped) form of the name - -In pretty most cases PDF names contains only letters (no special characters, no escapes), so decoded and encoded forms are identical. -In that case both functions simply return the argument. It is ok to call ``ppname_decoded()`` on already decoded form -and ``ppname_encoded()`` on already encoded form. Both forms are produced by PDF objects parser, so accessing ``ppname`` alter ego -in whatever direction needs no extra decoding or allocation costs. - -String ------- - -PDF strings have the same internal construction as names, so most of names description above applies to strings as well. -``ppstring`` is a typedef of ``const char *``, roughly ``'\0'`` terminiated C-string. To get the size of the string:: - - size_t ppstring_size(ppstring string); // macro, returns the length of the string in bytes - -Strings are provided in their raw form, preserving PDF specific escapes, but with no -``()`` or ``<>`` delims. To distinguish plain strings from hex strings:: - - int ppstring_hex(ppstring string); // macro, returns non zero if hex string - -Or if you prefer:: - - switch (ppstring_type(string)) - { - case PPSTRING_PLAIN: // literal string, surrounded by ``(`` and ``)`` in PDF - break; - case PPSTRING_BASE16: // hex string, surrounded by ``<`` and ``>`` in PDF - break; - case PPSTRING_BASE85: // base85 string surrounded by ``<~`` and ``~>`` in PDF - break; - } - -The last is actually Postscript specific, not used in PDF, but I think it might appear in contents streams... -No matter how the string is given in PDF (plain or hex), here are two functions to -switch between encoded and decoded strings forms:: - - ppstring ppstring_decoded (ppstring string); // returns decoded string possibly with PDF escapes - ppstring ppstring_encoded (ppstring string); // returns encoded string with no PDF escapes - -For hex strings, encoded form contains hex digits, while decoded form contains arbitrary bytes (the result of hex decoding). -Plain strings usually contains printable ASCII characters, but they might contain any binary data. -As with names, objects parser produces both forms. The raw form with PDF escapes (or raw hex form) is considered the main one. -Eg. when you access ``obj->string`` you always get the encoded form. At any moment you can switch to its alter ego. - -No matter if the string is plain or hex, if its first two bytes (decoded) are UTF16 BOM, the string -is considered unicode. ``ppstring`` object *knows* it is unicode or not:: - - switch (ppstring_utf(string)) - { - case PPSTRING_UTF16LE: // unicode string, utf16le - break; - case PPSTRING_UTF16BE: // unicode string, utf16be - break; - default: // no unicode - } - -Or simply:: - - if (ppstring_utf(string) != 0) { - // handle unicode string - } - -If the string is unicode, BOM remains the part of the string -- ``pplib`` parser does not strip it. -Unicode or not, encoded or decoded, strings are always C-arrays of bytes and ``ppstring_size()`` -always returns the size in bytes. - -Array ------ - -PDF arrays are represented as ``pparray`` type, which is C-array of ``ppobj`` structures. -To get the size:: - - size_t pparray_size(pparray *array) // macro, returns the number of array items - -To get ``ppobj *`` at a given index:: - - ppobj * pparray_at(array, index) // macro, returns ppobj * (no index check) - ppobj * pparray_get(array, index) // macro, returns ppobj * or NULL (with index check) - ppobj * pparray_get_obj (pparray *array, size_t index); // function equiv to pparray_get() - -Iterating over array elements:: - - pparray *array; - size_t index, size; - ppobj *obj; - for (size = pparray_size(array), pparray_first(array, index, obj); index < size; pparray_next(index, obj)) - { - // do something with index and obj - } - -There is no magic first/next macros, just iteration over pointers. One could also use something like:: - - for (index = 0, size = array->size; index < size; ++index) - { - obj = pparray_at(array, index); - // do something with index and obj - } - -When getting values from array and expecting a result of known type, use one of the following:: - - int pparray_get_bool (pparray *array, size_t index, int *v); // get boolean value - int pparray_get_int (pparray *array, size_t index, ppint *v); // get ppint value - int pparray_get_uint (pparray *array, size_t index, ppuint *v); // get ppuint value - int pparray_get_num (pparray *array, size_t index, ppnum *v); // get ppnum value - ppname pparray_get_name (pparray *array, size_t index); // get ppname value - ppstring pparray_get_string (pparray *array, size_t index); // get ppstring value - pparray * pparray_get_array (pparray *array, size_t index); // get pparray * value - ppdict * pparray_get_dict (pparray *array, size_t index); // get ppdict * value - ppref * pparray_get_ref (pparray *array, size_t index); // get ppref * value - -As with ``ppobj_get_*`` suite, numeric types getters set the value of a given type and returns 1, if the type matches. -Otherwise sets nothing and returns 0. Other getters return the value if the type matches, or NULL. - -Every function from ``pparray_get_*`` suite have its ``pparray_rget_*`` counterpart that -that dereferences indirect objects (as explained for ``ppobj_rget_*`` getters). Note that -there is no ``pparray_get_stream()`` function, as streams in PDF are always indirect. -To get the stream from array use:: - - ppstream * pparray_rget_stream (pparray *array, size_t index); - -Dict ----- - -PDF dicts are represented as ``ppdict`` structure, which is C-array of ``ppobj`` with parallel -C-array of ``ppname`` pointers. To get the size of a dict:: - - size_t ppdict_size(ppdict *dict) // macro, returns the number of key-val pairs - -To get the value at a given index (integer):: - - ppobj * ppdict_at(ppdict *dict, index) // macro, no index check - -To get the name (key) at a given index:: - - ppname ppdict_key(ppdict *dict, index) // macro, no index check - -To iterate over dict key-val pairs:: - - ppdict *dict; - ppname *pkey; - ppobj *obj; - - for (ppdict_first(dict, pkey, obj); *pkey != NULL; ppdict_next(pkey, obj)) - { - // do something with *pkey and obj - } - -There is no magic in first/next macros, just iteration through keys and values lists pointers. -For convenient iteration, a list of keys is terminated with NULL, so in the code above ``*pkey != NULL`` -is used as the loop condition. One may also iterate via indices:: - - ppdict *dict; - size_t index, size; - ppname key; - ppobj *obj; - for (index = 0, size = ppdict_size(dict); index < size; ++index) - { - key = ppdict_key(dict, index); - obj = ppdict_at(dict, index); - // do something with key and obj - } - -To get the object associated with a given name, use one of the following:: - - ppobj * ppdict_get_obj (ppdict *dict, const char *name); - int ppdict_get_bool (ppdict *dict, const char *name, int *v); - int ppdict_get_int (ppdict *dict, const char *name, ppint *v); - int ppdict_get_uint (ppdict *dict, const char *name, ppuint *v); - int ppdict_get_num (ppdict *dict, const char *name, ppnum *v); - ppname ppdict_get_name (ppdict *dict, const char *name); - ppstring ppdict_get_string (ppdict *dict, const char *name); - pparray * ppdict_get_array (ppdict *dict, const char *name); - ppdict * ppdict_get_dict (ppdict *dict, const char *name); - ppref * ppdict_get_ref (ppdict *dict, const char *name); - -Note that all getters accepts ``const char *`` as key, so it is ok to say:: - - ppdict_rget_dict(dict, "Resources"); - -as well as:: - - ppdic_rget_dict(dict, name); // ppname name - -Every ``ppdict_get_*`` getter has ``ppdict_rget_*`` counterpart that dereferences -indirect objects if necessary. Note that there is no ``ppdict_get_stream()`` function, -but there is:: - - ppstream * ppdict_rget_stream (ppdict *dict, const char *name); - -So far dicts comes with no names mapping, so by-name dict accessors perform a linear search -through the keys list. PDF dicts are usually small, so it is fast enough. -Building names lookup for every dict in PDF makes no sense I think, as ``pplib`` applications -will query just several dicts I guess.. However, some apps may extensively query -resources, which may refer to hundreds of objects (eg. images). So some mapping for dicts -is still considered. - -Stream ------- - -PDF streams are represented as ``ppstream`` objects. To get the stream dict:: - - ppdict * ppstream_dict(ppstream *stream) // macro - -To read the stream data:: - - uint8_t * ppstream_first (ppstream *stream, size_t *size, int decode); - uint8_t * ppstream_next (ppstream *stream, size_t *size); - void ppstream_done (ppstream *stream); - -Both ``first` and ``next`` functions return a chunk of stream data and sets the ``size`` of the chunk. -``decode`` parameter tell the reader to decompress the stream (1) or return raw (0). A call to ``ppstream_next()`` -must be preceeded by ``ppstream_first()``. Once you're done with the stream, you have to call ``ppstream_done()``, -no matter if the stream has been read to the end or not. The stream data iterator in use:: - - uint8_t *data; - size_t size; - ppstream *stream; - int decode = 1; // 1 - get decompressed, 0 - get raw - - for (data = ppstream_first(stream, &size, decode); data != NULL; data = ppstream_next(stream, &size)) - { - // do something with data and its size - } - ppstream_done(stream); - -Every subsequent iterator call invalidates the previous reader output, so you have to utilize the returned chunk -of data just after you ot that. So the following is wrong:: - - data1 = ppstream_first(stream, &size, 1); - data2 = ppstream_next(stream, &size); - data3 = ppstream_next(stream, &size); - some_output(data1, size); - some_output(data2, size); - -The reader calls usually return the same pointer to internal buffer, just filled with a different data. -``pplib`` allocates reasonably large buffer and fills that buffer on subsequent calls to the reader. - -If the source stream has no compression, using both ``decode == 1`` and ``decode == 0`` should give the same result. -You can check if the stream is actually compressed with:: - - ppstream_compressed(stream) // macro, returns non zero if /Filter is present - -It might be necessary to load the entire stream data at once:: - - uint8_t * ppstream_all (ppstream *stream, size_t *size, int decode); - -If the initial buffer size is insufficient, it grows until the entire stream data is loaded. You must call -``ppstream_done(stream)`` after using returned data. - -``ppstream_done()`` doesn't invalidate the stream object, it just closes its internal reader. -The stream itself remains a valid object (eg. one can read it again if necessary), -but the reader buffer is released. It is actually not freed but kept for future the reuse with that on some other stream, -but you still need to mark it ready for reuse to avoid allocating a separate buffer for every stream you're going to read. - -Stream data readers will return ``NULL`` if you haven't close the previous reader process with ``ppstream_done()``. All below is wrong:: - - data1 = ppstream_all(stream, &size, 1); - data2 = ppstream_all(stream, &size, 1); // data2 == NULL - // or - data1 = ppstream_first(stream, &size, 1); - data2 = ppstream_first(stream, &size, 1); // data2 == NULL - // or - data1 = ppstream_first(stream, &size, 1); - data2 = ppstream_all(stream, &size, 1); // data2 == NULL - -To avoid unnecessary dependencies, ``pplib`` does not support image filters (``/DCT``, ``/JPX``, ``/JBIG``, ``/CCITT``). -But it is ok to read the stream with ``decode`` set to 1 on such streams. ``pplib`` assumes that the image is the -final/target stream form and just returns it as-is. Eg. in the case of JPEG (``/DCT`` filtered) image both calls should -give the same results:: - - ppstream_all(jpegstream, &jpegsize, 0); // don't decode, return what's there - ppstream_all(jpegstream, &jpegsize, 1); // decode but found image filter, effectively the same - -A bit more about streams memory. As mentioned, ``pplib`` allocates buffers for stream readers. After ``ppstream_done()``, -the stream no longer *owns* the buffer space. But the buffer may remain allocated, to be reused with future readers. -``pplib`` keeps a pool of several buffers. This means, that when you use stream readers, ``pplib`` eats -some memory (1MB or so) that is not freed, even if no streams are used. And even if you free all objects. -If you suffer from this, you can optionally use a pair of functions:: - - void ppstream_init_buffers (void); - void ppstream_free_buffers (void); - -The first initializes buffers pool, unless done so far. Currently ``pplib`` cares of it before opening every stream reader, -so it is not obligatory. The second frees a pool of buffers. The intended use is to call ``ppstream_init_buffers()`` once -as kind of library initializer and to call ``ppstream_free_buffers()`` once, as the library finalizer. - -Filters -------- - -In version v1.00 (20190916) ``ppstream`` API has been extended with filters information. -``ppstream`` knows its filter(s) and keps it as ``stream->filter``:: - - // ppstream *stream; - ppstream_filter *info = &stream->filter; - -``ppstream_filter`` is the following structure:: - - typedef struct { - ppstreamtp *filters; // c-array of filter identifiers (enum integers) - ppdict **params; // c-array of ppdict pointers - size_t count; // number of filters, length of the arrays (typically 1) - } ppstream_filter; - -If ``count > 0`` then ``filters`` member is not NULL. Filters array keeps integer constants:: - - PPSTREAM_BASE16 /* /ASCIIHexDecode */ - PPSTREAM_BASE85 /* /ASCII85Decode */ - PPSTREAM_RUNLENGTH /* /RunLengthDecode */ - PPSTREAM_FLATE /* /FlateDecode */ - PPSTREAM_LZW /* /LZWDecode */ - PPSTREAM_CCITT /* /CCITTFaxDecode */ - PPSTREAM_DCT /* /DCTDecode */ - PPSTREAM_JBIG2 /* /JBIG2Decode */ - PPSTREAM_JPX /* /JPXDecode */ - PPSTREAM_CRYPT /* /Crypt */ - -Params array keeps corresponding filter parameters (``/DecodeParms``) if present. ``params`` member is not NULL -if ``count > 0`` and the stream dict has ``/DecodeParms`` entry. Even if ``params`` is there, -for every N-th filter, ``params[N]`` may be NULL (corresponding to PDF ``null``). - -``stream->filter`` keeps the source stream filter information, which may not correspond to the result of stream readers -(``ppstream_first()``, ``ppstream_next()``, ``ppstream_all()``). The get the filters info relevant to the result from readers:: - - void ppstream_filter_info (ppstream *stream, ppstream_filter *info, int decode); - -The function fills ``ppstream_filter`` structure according to the expected result from stream readers (example 3 shows -how to use it to reconstruct ``/Filter`` and ``/DecodeParms`` when copying the stream to some other PDF). - -To convert filter identifier (``ppstreamtp``) to a corresponding PDF filter name:: - - const char * ppstream_filter_name[]; - -To covert ``ppname`` to filter identifier:: - - int ppstream_filter_type (ppname filtername, ppstreamtp *filtertype); - // returns 1 and sets filtertype if filtername is the proper filter name - -Additional information about the stream can be fetched from macros:: - - ppstream_compressed(stream) /* stream->flags & (PPSTREAM_FILTER|PPSTREAM_IMAGE) */ - ppstream_filtered(stream) /* stream->flags & PPSTREAM_FILTER */ - ppstream_image(stream) /* stream->flags * PPSTREAM_IMAGE */ - -``stream->flags`` is a binary sum of the following:: - - PPSTREAM_FILTER /* set iff the stream filters list has one of: BASE16, BASE85, RUNLENGTH, FLATE, LZW */ - PPSTREAM_IMAGE /* set iff the stream filters list has one of: CCITT, DCT, JBIG2, JPX */ - PPSTREAM_ENCRYPTED /* set iff the stream is encrypted */ - PPSTREAM_ENCRYPTED_OWN /* set iff the stream has own CRYPT filter */ - -Note that ``PPSTREAM_COMPRESSED`` is not there any longer, use ``ppstream_compressed()`` instead. -And there is some more, see ``ppapi.h``. - -Ref ---- - -Indirect objects are represented as ``ppref`` structure. To get the object that the -reference refers to:: - - ppobj * ppref_obj(ppref *ref) // macro - -``ppref`` structure also keeps the reference number and version, a pointer to cross reference table it belongs -to and others, but I guess you won't need anything but the referenced object. ``pplib`` parser resolves references -on-fly. So if there is a dict with indirect objects:: - - << - /Type /Page - /Resources 123 0 R - ... - >> - -the parser will produce ``ppdict`` with ``Resources`` key pointing the proper ``ppref *`` value. -If you need more, access ``ppref`` members:: - - struct ppref { - ppobj object; // target object - ppuint number, version; // identifiers - size_t offset; // file offset (useless for you, may be zero for compressed objects) - ppuint length; // the length of the original object data - ppxref *xref; // cross reference table it belongs to - }; - - -XRef ----- - -Cross reference table is exposed as ``ppxref`` (incomplete type, you can only oprate on its pointer). -To get top document xref:: - - ppxref * ppdoc_xref (ppdoc *pdf); - -To get previous (older) xref:: - - ppxref * ppxref_prev (ppxref *xref); - -To find an object of a given refnumber:: - - ppref * ppxref_find (ppxref *xref, ppuint refnumber); - -[Note: since pplib v0.98 in case of documents with incremental update, ``ppxref_find()`` returns -the newest available version of a given object rather than the object in a given body.] - -PDF ---- - -PDF document is represented as ``ppdoc`` structure (incomplete type, you can only operate on its pointer). -To load a document from file:: - - ppdoc * ppdoc_load (const char *filename); - -To load a document from memory data:: - - ppdoc * ppdoc_mem (const void *data, size_t size); - -The data is assumed to be a buffer allocated with ``malloc`` - it is freed when destroying ``ppdoc``. - -Both loaders returns ``NULL`` on failure. - -To free ``ppdoc`` and all objects it refers to:: - - void ppdoc_free (ppdoc *pdf); - -So far we haven't mention about any explicit object reclaimers. There are no dedicated ``free`` functions -for other objects. You don't allocate or free objects yourself. ``ppdoc`` object is an owner of all -beings it refers to. It also means that every object described so far is alive as long as the containing -``ppdoc`` is alive. - -To access main PDF dicts:: - - ppdict * ppdoc_trailer(ppdoc *pdf); // returns top xref trailer dict - ppdict * ppdoc_catalog(ppdoc *pdf); // returns catalog referred from the trailer - ppdict * ppdoc_info(ppdoc *pdf); // returns info dict referred from the trailer - -To get the PDF version:: - - const char * ppdoc_version_string (ppdoc *pdf); // version string - int ppdoc_version_number (ppdoc *pdf, int *minor); // minor and major numbers - -To get the file size of the source PDF document:: - - size_t ppdoc_file_size (ppdoc *pdf); - -To get the number of objects in all xrefs:: - - ppuint ppdoc_objects (ppdoc *pdf); - -To get the approx usage of memory:: - - size_t ppdoc_memory (ppdoc *pdf, size_t *waste); - -Encryption ----------- - -``pplib`` handles encrypted (password protected) documents. If a document is encrypted, most of strings and streams are ciphered. -In that form they are unreadable and rather useless, you can't even rewrite such strings/streams as-is to a different PDF output. -It is a common practise to *protect* documents with an empty password. Such documents remain readable in Acrobat (just opens them without prompting -for a password), but some features (eg. printing) may restricted by the application. - -When ``pplib`` detects encryption, it follows Acrobat approach and first tries an empty password. If it succeeds, ``pplib`` proceeeds normally, providing -an access to decrypted strings and streams, as if they weren't ciphered. If the document is protected with non-empty password, ``pplib`` gives -a way to provide a password and proceed. Until you provide a password, ``ppdoc`` object returned by ``ppdoc_load()`` function has all object wntries -set to ``null``. - -After loading a document you should check encryption status with:: - - ppcrypt_status ppdoc_crypt_status (ppdoc *pdf); - -``ppcrypt_status`` (integer) may have the following values: - - ``PPCRYPT_NONE`` - no encryption, go ahead - ``PPCRYPT_DONE`` - encryption present but password succeeded, go ahead - ``PPCRYPT_PASS`` - encryption present, need non-empty password - ``PPCRYPT_FAIL`` - invalid or unsupported encryption (eg. undocumented in pdf spec) - -If a password is needed, you can provide one with:: - - ppcrypt_status ppdoc_crypt_pass (ppdoc *pdf, const void *userpass, size_t userpasslength, - const void *ownerpass, size_t ownerpasslength); - -Well, yes, there are actually two passwords in encrypted documents. Relation between them is obscure to me, but enough -to know that having one of them is enough to decrypt the document. If you know the password, you probably mean -``userpass``, in which case you should put ``NULL`` as ``ownerpass``. The function returns ``PPCRYPT_DONE`` if the password -succeeds and the previous status otherwise. Your custom loader function may look like that:: - - ppdoc *pdf; - pdf = ppdoc_load("file.pdf"); - if (pdf == NULL) - return NULL; - switch (ppdoc_crypt_status(pdf)) - { - case PPCRYPT_NONE: - case PPCRYPT_DONE: - return pdf; - case PPCRYPT_PASS: - if (ppdoc_crypt_pass(pdf, "dummy", 5, NULL, 0) == PPCRYPT_DONE || - ppdoc_crypt_pass(pdf, NULL, 0, "dummy", 5) == PPCRYPT_DONE) - return pdf; - printf("sorry, password needed\n"); - ppdoc_free(pdf); - return NULL; - case PPCRYPT_FAIL: - printf("sorry, encryption failed\n"); - ppdoc_free(pdf); - return NULL; - } - -[If you get ``PPCRYPT_FAIL`` it might mean *I failed*, so treat as a bug.] - -If you'd like to know what permissions are given/restricted to encrypted document:: - - ppint ppdoc_permissions (ppdoc *pdf); - -Returned value can be queried with the following binary flags (you can verify with Acrobat *File -> Properties -> Security* tab):: - - PPDOC_ALLOW_PRINT // printing - PPDOC_ALLOW_MODIFY // filling form fields, signing, creating template pages - PPDOC_ALLOW_COPY // copying, copying for accessibility - PPDOC_ALLOW_ANNOTS // filling form fields, copying, signing - PPDOC_ALLOW_EXTRACT // contents copying for accessibility - PPDOC_ALLOW_ASSEMBLY // (no effect) - PPDOC_ALLOW_PRINT_HIRES // (no effect) - -``pplib`` does absolutelly nothing with permissions, it cares only to decrypt the document. As mentioned, encryption applies to strings -and streams. ``pplib`` decrypt strings when parsing document objects, so the result you get is *normal* (not ciphered). -Streams are decrypted whenever you access them. Even if you ask for a raw stream data, you'll get a raw (compressed) stream, but decrypted. -So except the check to ``ppdoc_crypt_status()``, you shouldn't bother about encryption. - -In encrypted documents most of streams are encrypted. To check if a given stream is encrypted:: - - ppstream_encrypted(stream) // macro, returns non-zero if encrypted - -Encryption is independent from compression, don't confuse with ``ppstream_compressed()`` - -Pages ------ - -Several helpers to deal with pages. To get the number of pages:: - - ppuint ppdoc_page_count (ppdoc *pdf); - -To access the root pages tree node:: - - ppref * ppdoc_pages(ppdoc *pdf); - -To get the page reference at a given index:: - - ppref * ppdoc_page (ppdoc *pdf, ppuint index); - -``index`` is a page number. First page has number 1. For index out of bounds ``ppdoc_page()`` returns NULL. -Iterating over pages using index from 1 to ``ppdoc_page_count()`` and calling ``ppdoc_page()`` on each iteration -would be suboptimal. Here is a dedicted iterator for this:: - - ppref * ppdoc_first_page (ppdoc *pdf); - ppref * ppdoc_next_page (ppdoc *pdf); - -The iterator in use:: - - ppdoc *pdf; - ppref *ref; - ppdict *dict; - int pageno; - - pdf = ppdoc_load("file.pdf"); - for (ref = ppdoc_first_page(pdf), pageno = 1; ref != NULL; ref = ppdoc_next_page(pdf), ++pageno) - { - dict = ppref_obj(obj)->dict; // take for granted it is a dict - // do something with the page dict - } - -Functions related to pages return ``ppref *`` ensured to contain dict object, so you don't need sanity -type checks here. - -Contents --------- - -PDF page contents can be given as a stream or array of streams. Here is a convenience iterator over page -contents streams:: - - ppstream * ppcontents_first (ppdict *dict); - ppstream * ppcontents_next (ppdict *dict, ppstream *stream); - -A complete example of contents stream parser use is given below (example 2). -But before we get there, we need to introduce ``ppcontext`` object. Conceptually, -``ppcontext`` is an owner (memory handler) of objects created on demand (beyond the ``ppdoc``). -So far used only with contents stream parser, which might produce quite some data that we want -to release just after used. To create a new context:: - - pcontext * ppcontext_new (void); - -It initializes a new context and its internal memory heap, taking about 64kB on start. After that, -the context is ready to produce objects (contents parsing functions below). Once objects produced -from a given context are no longer needed:: - - void ppcontext_done (ppcontext *context); - -It restores the context to its initial state, as after ``ppcontext_new()``. It means that the context -is ready to produce another bunch of beings (in the example below, all objects from the next page contents). -Once the context is not needed anymore:: - - void ppcontext_free (ppcontext *context); - -Now, contents stream parser functions take the context as an argument. Iterator form of contents stream parser -that allows to process the contents operator by operator:: - - ppobj * ppcontents_first_op (ppcontext *context, ppstream *stream, size_t *psize, ppname *pname); - ppobj * ppcontents_next_op (ppcontext *context, ppstream *stream, size_t *psize, ppname *pname); - -Returned ``ppobj *`` is a pointer to operands list. ``*psize`` is the number of operands on stack. -The operator itself is stored as ``*pname``. - -To parse the entire contents stream at once with no stop at every operator:: - - ppobj * ppcontents_parse (ppcontext *context, ppstream *stream, size_t *psize); - -Returns probably quite long list of all parsed objects (operands and operatos) in one piece. -The number of objects is stored to ``*psize``. - -[Contents may contain so called inline images, that breaks a simple scheme of operands / operator syntax:: - - BI ID EI - -Contents parser treats this genuine triplet as a single piece, producing two operands (dict and string) -followed by ``EI`` operator name.] - -Boxes ------ - -Boxes (rectangles) in PDF are roughly 4-number arrays, but with a special intent. -``pplib`` provides a basic interface for these special arrays:: - - typedef struct { - ppnum lx, ly, rx, ry; - } pprect; - -This type is used only by helper functions - PDF parser is not aware of the rectangle type. -To convert ``pparray`` to ``pprect``:: - - pprect * pparray_to_rect (pparray *array, pprect *rect); // returns rect or NULL - -In example:: - - pprect rect; - if (pparray_to_rect(array, &rect) != NULL) - ; // do something with rect - -To get some image bounding box:: - - pprect * ppdict_get_rect (ppdict *dict, const char *name, pprect *rect); - // eg. ppdict_get_rect(imagedict, "BBox", &rect) - -To get some page box:: - - pprect * ppdict_get_box (ppdict *dict, const char *name, pprect *rect); - // eg. ppdict_get_box(pagedict, "MediaBox", &rect) - -The later not only checks the pagedict, but also goes through parent page nodes. - -Transforms ----------- - -Transformations are given as 6-number arrays, but with a special intent. -``pplib`` provides a basic interface for these special arrays:: - - typedef struct { - ppnum xx, xy, yx, yy, x, y; - } ppmatrix; - -This type is used only by helper functions - PDF parser is not aware of the matrix type. -To convert ``pparray`` to ``ppmatrix``:: - - ppmatrix * pparray_to_matrix (pparray *array, ppmatrix *matrix); - -In example:: - - ppmatrix matrix; - if (pparray_to_matrix(array, &matrix) != NULL) - ; // do something with matrix - -To get the matrix from dict:: - - ppmatrix * ppdict_get_matrix (ppdict *dict, const char *name, ppmatrix *matrix); - // eg. ppdict_get_matrix(imagedict, "Matrix", &matrix) - -Errors handling ---------------- - -``pplib`` is not verbose, but might happen that it needs to log some error message, eg. when parsing -of some PDF boject fails due to invalid offsets. By default, ``pplib`` prints the message to stdout, eg.:: - - invalid 123 0 R object at offset 123123 - -To replace the default logger, you can provide your own:: - - void pplog_callback (pplogger_callback logger, void *alien); - -``pplogger_callback`` is a function:: - - void your_callback (const char *message, void *alien); - -In example, to redirect messages to stderr you may define a function:: - - void your_callback (const char *message, void *alien) - { - fprintf((FILE *)alien, "\nooops: %s\n", message); - } - -Then set the callback somewhere before loading documents:: - - pplog_callback(your_callback, stderr); - -(example 2 uses that). - -To set the default log messages prefix, eg. ``pplib:``, use:: - - int pplog_prefix (const char *prefix) - -Default is empty. The function succeeds if provided prefix is reasonably short (less then 32 bytes). diff --git a/Build/source/libs/pplib/pplib-src/doc/_build/html/_sources/ppcode.rst.txt b/Build/source/libs/pplib/pplib-src/doc/_build/html/_sources/ppcode.rst.txt deleted file mode 100644 index ebe92465d80..00000000000 --- a/Build/source/libs/pplib/pplib-src/doc/_build/html/_sources/ppcode.rst.txt +++ /dev/null @@ -1,101 +0,0 @@ -Examples -======== - -Example 1 ---------- - -.. literalinclude:: ../src/pptest1.c - -Example 2 ---------- - -.. literalinclude:: ../src/pptest2.c - -Example 3 ---------- - -.. literalinclude:: ../src/pptest3.c - -ppapi.h -------- - -.. literalinclude:: ../src/ppapi.h - - -Changes -======= - -v0.97 ------ -First release integrated with luatex sources, plus portability changes from Luigi. - -v0.98 ------ -Changed references resolving in case of incremental updates; tech notes ppxref_find() in ppxref.c. - -v0.99 ------ -Fixed streams handling; null characters should NOT be gobbled after "stream" keyword - -v1.00 ------ -Fixed streams handling (Luigi); object streams updated before other streams -Revised streams handling, ppstream API extended - -v1.01 ------ -Fixed names handling (thanks Hans); digits after '#' weren't skipped - -v1.02 ------ -Fixed page finder (thanks Luigi) - -v1.03 ------ -Fixed TIFF predictor (thanks folks) - -v1.04 ------ -Fixed TIFF predictor for ARM - -v1.05 ------ -Attempt to fix parsing inline images crap - -v2.00 ------ -Deep rework on allocators. -Deep rework on strings and names. - -v2.01 ------ -Fixed invalid stream buffer handling; ``iof_discard()`` no longer reclaims the source (``filter->next``) filter. -Sanity alignment adjustments in ``iof_heap``. - -v2.02 ------ -Fixed incorrect encoding of strings alterego with octal escaping, thanks Luigi. -On Hans request added ``ppdoc_filehandle()`` function and ``ppdoc_file()`` macro for loading ppdoc from ``FILE *``. - -v2.03 ------ -Fixed alloc/free of ``ppdoc`` heap; ``ppdoc`` is now mallocated, no longer taken from its own heap. Again, thanks Luigi. -Fixed warnings about dereferencing type-puned pointers, and some others. - -v2.04 ------ -Byte lookups for names/strings loaders are now int8_t, as char might be signed. -ppdoc_first_page() / ppdoc_next_page() iterator now handles a case when /Kids array is empty. -Fixed generating keys for encrypted streams; ppstring_internal() returns the string of the proper size. -More stream tests in pptest3.c. -Some rework on md5 and sha2. - -v2.05 ------ -uint8_t instead of ppbyte in internals; ppbyte intent is "the most natural 8-bit integer", so it is 'char', -but internally we almost always need uint8_t (char may be signed or not..) - -TODO -==== -- external streams (egzotic) - diff --git a/Build/source/libs/pplib/pplib-src/doc/_build/html/_sources/pplib.rst.txt b/Build/source/libs/pplib/pplib-src/doc/_build/html/_sources/pplib.rst.txt deleted file mode 100644 index 763dc79cf62..00000000000 --- a/Build/source/libs/pplib/pplib-src/doc/_build/html/_sources/pplib.rst.txt +++ /dev/null @@ -1,15 +0,0 @@ -.. pplib documentation master file, created by - sphinx-quickstart on Thu Jun 07 14:23:51 2018. - You can adapt this file completely to your liking, but it should at least - contain the root `toctree` directive. - -pplib -===== - -.. toctree:: - :maxdepth: 2 - - ppnew - ppapi-2.x - ppapi-1.x - ppcode diff --git a/Build/source/libs/pplib/pplib-src/doc/_build/html/_sources/ppnew.rst.txt b/Build/source/libs/pplib/pplib-src/doc/_build/html/_sources/ppnew.rst.txt deleted file mode 100644 index 4a0a3b42887..00000000000 --- a/Build/source/libs/pplib/pplib-src/doc/_build/html/_sources/ppnew.rst.txt +++ /dev/null @@ -1,103 +0,0 @@ - -1.x vs 2.x -========== - -Allocation ----------- - -Allocation mechanisms has been revised. All objects are still allocated from a private storage (called heap), -but now the heap serves properly aligned memory chunks. Implementation of the heap is (hopefully) platform -independent, so all ``ARM_COMPLIANT`` checks has been removed. Some details work differently on 32/64-bit -machines, this distinction seems inevitable. Allocation related code has been moved to ``util/utilmem*.c`` files. - -[There are actually 3 different allocators - **heap**, **stock**, and **pool** - each of which has 4 variants -for 1, 2, 4 and 8 bytes alignment. So far ``pplib`` uses only the **heap**, but I want to have this part -in a single place for a while. More notes about allocators in ``utilmemallc.h``.] - -``pplib`` uses two heaps: - -* bytes heap - providing 2-bytes aligned memory chunks for byte data -* structures heap - providing 8-bytes aligned chunks for all structures - -2-bytes alignment of byte data is caused by implementation details / limits, ``pplib`` doesn't make a use of it -(could be unaligned as well). All the structures are stored in 8-bytes aligned chunks on both 32 and 64-bit machines -(in some structures we use ``double`` and ``int64_t``, which generally needs 8-bytes). - -Strings And Names ------------------ - -So far, both ``ppname`` and ``ppstring`` were aliases to ``char *`` with an extra structure hidden just below -the data address. The idea was to make a string or name usable whenever chars array can, at the cost of some -pointers trickery. Both names and strings keep an information about pdf-encoded data, as well as plain bytes data. -I implemented this feature once ``pplib 1.0`` was almost done, and to avoid a revolution, I made that with yet -another trick. This all was dirty and caused lots of alignment issues. - -Now ``ppstring`` and ``ppname`` are **structures**, keeping data and size members, pretty much like ``pparray``:: - - struct ppname { - ppbyte *data; - size_t size; - ppname *alterego; - int flags; - }; - - struct ppstring { - ppbyte *data; - size_t size; - ppstring *alterego; - int flags; - }; - -Data member is a pointer to (2-bytes aligned) bytes array -- ``ppbyte *``. ``ppbyte`` is an alias to ``char``. -``pplib`` makes no assumptions about ``ppbyte`` signedness. [I'd prefer to have ``uint8_t``, but better -keep that in sync with ``ppdict_get_*`` suite, which accepts ``char *``. Using ``"string literals"`` -with ``ppdict_get`` function is the most common case, I guess.] - -``ppname_size()`` and ``ppstring_size() `` now have -trivial ``ppname_data()`` and ``ppstring_data()`` counterparts:: - - #define ppname_size(name) ((name)->size) - #define ppname_data(name) ((name)->data) - - #define ppstring_size(string) ((string)->size) - #define ppstring_data(string) ((string)->data) - -Switching between encoded / decoded variants is made via explicit ``alterego`` member. If encoded and decoded forms -are identical, then ``self->alfterego == self`` (never NULL). Helper functions for that:: - - PPAPI ppname * ppname_decoded (ppname *name); - PPAPI ppname * ppname_encoded (ppname *name); - - PPAPI ppbyte * ppname_decoded_data (ppname *name); - PPAPI ppbyte * ppname_encoded_data (ppname *name); - - PPAPI ppstring * ppstring_decoded (ppstring *string); - PPAPI ppstring * ppstring_encoded (ppstring *string); - - PPAPI ppbyte * ppstring_decoded_data (ppstring *string); - PPAPI ppbyte * ppstring_encoded_data (ppstring *string); - -Since ``ppname`` and ``ppstring`` are now structures, all API functions returning name/string or taking name/string -as an argument, now take **a pointer to name/string**. Watch out for ``ppdict_get_*`` functions suite. They still accept -``const char *`` key as an argument, but ``ppname`` type can no longer be used there:: - - ppname key; - ppdict_get_something(dict, key); // wrong - ppdict_get_something(dict, key.data); // ok - - ppname *pkey; - ppdict_get_something(dict, (const char *)pkey); // wrong - ppdict_get_something(dict, pkey->data); // ok - -Consequently, functions / macros that used pointer to ``ppname`` (``ppdict_first()`` / ``ppdict_next()``), -now needs ``ppname **pname``. - -Cleanups --------- - -Some of unused utils were removed. There is still some code in utils part that is not used by the library, -but I need this tollbox in many other places and don't want to maintain two versions. - -Some unification in integer types; ``size_t`` seems to be the best choice for and integer representing machine -word (``unsigned long`` is not long enough on windows), less utils dependencies, less compiler warnings. - diff --git a/Build/source/libs/pplib/pplib-src/doc/_build/html/_static/ajax-loader.gif b/Build/source/libs/pplib/pplib-src/doc/_build/html/_static/ajax-loader.gif deleted file mode 100644 index 61faf8cab23..00000000000 Binary files a/Build/source/libs/pplib/pplib-src/doc/_build/html/_static/ajax-loader.gif and /dev/null differ diff --git a/Build/source/libs/pplib/pplib-src/doc/_build/html/_static/background_b01.png b/Build/source/libs/pplib/pplib-src/doc/_build/html/_static/background_b01.png deleted file mode 100644 index 353f26dde08..00000000000 Binary files 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d;if(f==="dpcm"){d=o("1cm")}else{d=o("1in")}if(t!==null){if(u==="resolution"){return i&&d>=a||s&&d0}}else{return false}};var a=function(e){var t=e.getValid();var n=e.getExpressions();var r=n.length;if(r>0){for(var i=0;i0){u=false;for(var f=0;f0){l[c++]=","}l[c++]=h}}if(l.length>0){r[r.length]=cssHelper.addStyle("@media "+l.join("")+"{"+e.getCssText()+"}",t,false)}};var l=function(e,t){for(var n=0;n0}}var o=[],u=[];for(var f in i){if(i.hasOwnProperty(f)){o[o.length]=f;if(i[f]){u[u.length]=f}if(f==="all"){n=true}}}if(u.length>0){r[r.length]=cssHelper.addStyle(e.getCssText(),u,false)}var c=e.getMediaQueryLists();if(n){l(c)}else{l(c,o)}};var h=function(e){for(var t=0;td||Math.abs(s-t)>d){e=n;t=s;clearTimeout(r);r=setTimeout(function(){if(!i()){p()}else{cssHelper.broadcast("cssMediaQueriesTested")}},500)}};window.onresize=function(){var e=window.onresize||function(){};return function(){e();s()}}()};var m=document.documentElement;m.style.marginLeft="-32767px";setTimeout(function(){m.style.marginLeft=""},5e3);return function(){if(!i()){cssHelper.addListener("newStyleParsed",function(e){c(e.cssHelperParsed.stylesheet)});cssHelper.addListener("cssMediaQueriesTested",function(){if(ua.ie){m.style.width="1px"}setTimeout(function(){m.style.width="";m.style.marginLeft=""},0);cssHelper.removeListener("cssMediaQueriesTested",arguments.callee)});s();p()}else{m.style.marginLeft=""}v()}}());try{document.execCommand("BackgroundImageCache",false,true)}catch(e){} diff --git a/Build/source/libs/pplib/pplib-src/doc/_build/html/_static/css3-mediaqueries_src.js b/Build/source/libs/pplib/pplib-src/doc/_build/html/_static/css3-mediaqueries_src.js deleted file mode 100644 index f21dd4949aa..00000000000 --- a/Build/source/libs/pplib/pplib-src/doc/_build/html/_static/css3-mediaqueries_src.js +++ /dev/null @@ -1,1104 +0,0 @@ -/* -css3-mediaqueries.js - CSS Helper and CSS3 Media Queries Enabler - -author: Wouter van der Graaf -version: 1.0 (20110330) -license: MIT -website: http://code.google.com/p/css3-mediaqueries-js/ - -W3C spec: http://www.w3.org/TR/css3-mediaqueries/ - -Note: use of embedded