summaryrefslogtreecommitdiff
path: root/Build/source/texk/web2c/luatexdir/zziplib/zzip/fseeko.c
diff options
context:
space:
mode:
Diffstat (limited to 'Build/source/texk/web2c/luatexdir/zziplib/zzip/fseeko.c')
-rw-r--r--Build/source/texk/web2c/luatexdir/zziplib/zzip/fseeko.c580
1 files changed, 0 insertions, 580 deletions
diff --git a/Build/source/texk/web2c/luatexdir/zziplib/zzip/fseeko.c b/Build/source/texk/web2c/luatexdir/zziplib/zzip/fseeko.c
deleted file mode 100644
index 2207f5dc981..00000000000
--- a/Build/source/texk/web2c/luatexdir/zziplib/zzip/fseeko.c
+++ /dev/null
@@ -1,580 +0,0 @@
-/*
- * NOTE: this is part of libzzipfseeko (i.e. it is not libzzip).
- *
- * These routines are fully independent from the traditional zzip
- * implementation. They assume a readonly seekable stdio handle
- * representing a complete zip file. The functions show how to
- * parse the structure, find files and return a decoded bytestream.
- *
- * These routines are a bit simple and really here for documenting
- * the way to access a zip file. The complexity of zip access comes
- * from staggered reading of bytes and reposition of a filepointer in
- * a big archive with lots of files and long compressed datastreams.
- * Plus varaints of drop-in stdio replacements, obfuscation routines,
- * auto fileextensions, drop-in dirent replacements, and so on...
- *
- * btw, we can _not_ use fgetpos/fsetpos since an fpos_t has no asserted
- * relation to a linear seek value as specified in zip info headers. In
- * general it is not a problem if your system has no fseeko/ftello pair
- * since we can fallback to fseek/ftell which limits the zip disk size
- * to 2MiBs but the zip-storable seek values are 32bit limited anyway.
- *
- * Author:
- * Guido Draheim <guidod@gmx.de>
- *
- * Copyright (c) 2003,2004 Guido Draheim
- * All rights reserved,
- * use under the restrictions of the
- * Lesser GNU General Public License
- * or alternatively the restrictions
- * of the Mozilla Public License 1.1
- */
-
-#define _LARGEFILE_SOURCE 1
-#define _ZZIP_ENTRY_STRUCT 1
-
-#include <zzip/types.h>
-
-#include <assert.h>
-#include <stdlib.h>
-#include <sys/stat.h>
-
-#if defined ZZIP_HAVE_STRING_H
-#include <string.h>
-#elif defined ZZIP_HAVE_STRINGS_H
-#include <strings.h>
-#endif
-
-#include <zlib.h>
-#include <zzip/format.h>
-#include <zzip/fseeko.h>
-#include <zzip/fetch.h>
-#include <zzip/__mmap.h>
-#include <zzip/__fnmatch.h>
-
-#if __STDC_VERSION__+0 > 199900L
-#define ___
-#define ____
-#else
-#define ___ {
-#define ____ }
-#endif
-
-#ifndef ZZIP_HAVE_FSEEKO
-#define fseeko fseek
-#define ftello ftello
-#endif
-
-/* note that the struct zzip_entry inherits the zzip_disk_entry values
- * and usually carries a copy of its values (in disk format!). To make the
- * following code more readable, we use a shorthand notation for the
- * upcast needed in C (not needed in C++) as "disk_(entry)".
- */
-#ifdef __zzip_entry_extends_zzip_disk_entry
-#define disk_(_entry_) _entry_
-#else
-#define disk_(_entry_) (& (_entry_)->head)
-#endif
-
-/* we try to round all seeks to the pagesize - since we do not use
- * the sys/mmap interface we have to guess a good value here: */
-#define PAGESIZE 8192
-
-/* ====================================================================== */
-/* helper functions */
-
-/** => zzip_entry_data_offset
- * This functions read the correspoding struct zzip_file_header from
- * the zip disk of the given "entry". The returned off_t points to the
- * end of the file_header where the current fseek pointer has stopped.
- * This is used to immediatly parse out any filename/extras block following
- * the file_header. The return value is null on error.
- */
-static zzip_off_t
-zzip_entry_fread_file_header (ZZIP_ENTRY* entry,
- struct zzip_file_header* file_header)
-{
- if (! entry || ! file_header) return 0;
- ___ zzip_off_t offset = zzip_disk_entry_fileoffset (disk_(entry));
- if (0 > offset || offset >= entry->disksize) return 0;
-
- fseeko (entry->diskfile, offset, SEEK_SET);
- return (fread (file_header, sizeof(*file_header), 1, entry->diskfile)
- ? offset+sizeof(*file_header) : 0 ); ____;
-}
-
-/** helper functions for (fseeko) zip access api
- *
- * This functions returns the seekval offset of the data portion of the
- * file referenced by the given zzip_entry. It requires an intermediate
- * check of the file_header structure (i.e. it reads it from disk). After
- * this call, the contained diskfile readposition is already set to the
- * data_offset returned here. On error -1 is returned.
- */
-zzip_off_t
-zzip_entry_data_offset(ZZIP_ENTRY* entry)
-{
- struct zzip_file_header file_header;
- if (! entry) return -1;
- ___ zzip_off_t offset =
- zzip_entry_fread_file_header (entry, & file_header);
- if (! offset) return -1;
- offset += zzip_file_header_sizeof_tails (& file_header);
- fseeko (entry->diskfile, offset, SEEK_SET);
- return offset; ____;
-}
-
-/** => zzip_entry_data_offset
- * This function is a big helper despite its little name: in a zip file the
- * encoded filenames are usually NOT zero-terminated but for common usage
- * with libc we need it that way. Secondly, the filename SHOULD be present
- * in the zip central directory but if not then we fallback to the filename
- * given in the file_header of each compressed data portion.
- */
-zzip__new__ char*
-zzip_entry_strdup_name(ZZIP_ENTRY* entry)
-{
- if (! entry) return 0;
-
- ___ zzip_size_t len;
- if ((len = zzip_disk_entry_namlen (disk_(entry)))) {
- char* name = malloc (len+1);
- if (! name) return 0;
- memcpy (name, entry->tail, len);
- name[len] = '\0';
- return name;
- }
- ___ auto struct zzip_file_header header;
- if (zzip_entry_fread_file_header (entry, &header)
- && ( len = zzip_file_header_namlen(&header) )) {
- char* name = malloc (len+1);
- if (! name) return 0;
- fread (name, 1, len, entry->diskfile);
- name[len] = '\0';
- return name;
- }
- return 0;
- ____;____;
-}
-
-static int
-prescan_entry(ZZIP_ENTRY* entry)
-{
- assert (entry);
- ___ zzip_off_t tailsize = zzip_disk_entry_sizeof_tails (disk_(entry));
- if (tailsize+1 > entry->tailalloc) {
- char* newtail = realloc (entry->tail, tailsize+1);
- if (! newtail) return ENOMEM;
- entry->tail = newtail;
- entry->tailalloc = tailsize+1;
- }
- fread (entry->tail, 1, tailsize, entry->diskfile);
- /* name + comment + extras */
- return 0; ____;
-}
-
-static void
-prescan_clear(ZZIP_ENTRY* entry)
-{
- assert (entry);
- if (entry->tail) free (entry->tail);
- entry->tail = 0; entry->tailalloc = 0;
-}
-
-/* ====================================================================== */
-
-/** => zzip_entry_findfile
- *
- * This function is the first call of all the zip access functions here.
- * It contains the code to find the first entry of the zip central directory.
- * Here we require the stdio handle to represent a real zip file where the
- * disk_trailer is _last_ in the file area, so that its position would be at
- * a fixed offset from the end of the file area if not for the comment field
- * allowed to be of variable length (which needs us to do a little search
- * for the disk_tailer). However, in this simple implementation we disregard
- * any disk_trailer info telling about multidisk archives, so we just return
- * a pointer to the first entry in the zip central directory of that file.
- *
- * For an actual means, we are going to search backwards from the end
- * of the mmaped block looking for the PK-magic signature of a
- * disk_trailer. If we see one then we check the rootseek value to
- * find the first disk_entry of the root central directory. If we find
- * the correct PK-magic signature of a disk_entry over there then we
- * assume we are done and we are going to return a pointer to that label.
- *
- * The return value is a pointer to the first zzip_disk_entry being checked
- * to be within the bounds of the file area specified by the arguments. If
- * no disk_trailer was found then null is returned, and likewise we only
- * accept a disk_trailer with a seekvalue that points to a disk_entry and
- * both parts have valid PK-magic parts. Beyond some sanity check we try to
- * catch a common brokeness with zip archives that still allows us to find
- * the start of the zip central directory.
- */
-zzip__new__ ZZIP_ENTRY*
-zzip_entry_findfirst(FILE* disk)
-{
- if (! disk) return 0;
- fseeko (disk, 0, SEEK_END);
- ___ zzip_off_t disksize = ftello (disk);
- if (disksize < (zzip_off_t) sizeof(struct zzip_disk_trailer)) return 0;
- /* we read out chunks of 8 KiB in the hope to match disk granularity */
- ___ zzip_off_t pagesize = PAGESIZE; /* getpagesize() */
- ___ ZZIP_ENTRY* entry = malloc (sizeof(*entry)); if (! entry) return 0;
- ___ unsigned char* buffer = malloc (pagesize); if (! buffer) goto nomem;
-
- assert (pagesize/2 > (zzip_off_t) sizeof (struct zzip_disk_trailer));
- /* at each step, we will fread a pagesize block which overlaps with the
- * previous read by means of pagesize/2 step at the end of the while(1) */
- ___ zzip_off_t mapoffs = disksize &~ (pagesize-1);
- ___ zzip_off_t mapsize = disksize - mapoffs;
- if (mapoffs && mapsize < pagesize/2) {
- mapoffs -= pagesize/2; mapsize += pagesize/2; }
- while(1) {
- fseeko (disk, mapoffs, SEEK_SET);
- fread (buffer, 1, mapsize, disk);
- ___ unsigned char* p =
- buffer + mapsize - sizeof(struct zzip_disk_trailer);
- for (; p >= buffer ; p--)
- {
- zzip_off_t root; /* (struct zzip_disk_entry*) */
- if (zzip_disk_trailer_check_magic(p)) {
- root = zzip_disk_trailer_rootseek (
- (struct zzip_disk_trailer*)p);
- if (root > disksize - (long)sizeof(struct zzip_disk_trailer)) {
- /* first disk_entry is after the disk_trailer? can't be! */
- zzip_off_t rootsize = zzip_disk_trailer_rootsize (
- (struct zzip_disk_trailer*)p);
- if (rootsize > mapoffs) continue;
- /* a common brokeness that can be fixed: we just assume the
- * central directory was written directly before : */
- root = mapoffs - rootsize;
- }
- } else if (zzip_disk64_trailer_check_magic(p)) {
- if (sizeof(zzip_off_t) < 8) return 0;
- root = zzip_disk64_trailer_rootseek (
- (struct zzip_disk64_trailer*)p);
- } else continue;
-
- assert (0 <= root && root < mapsize);
- fseeko (disk, root, SEEK_SET);
- fread (disk_(entry), 1, sizeof(*disk_(entry)), disk);
- if (zzip_disk_entry_check_magic(entry)) {
- free (buffer);
- entry->headseek = root;
- entry->diskfile = disk;
- entry->disksize = disksize;
- if (prescan_entry(entry)) goto nomem;
- return entry;
- }
- } ____;
- if (! mapoffs) break; assert (mapsize >= pagesize/2);
- mapoffs -= pagesize/2; /* mapsize += pagesize/2; */
- mapsize = pagesize; /* if (mapsize > pagesize) ... */
- if (disksize - mapoffs > 64*1024) break;
- }
- free (buffer);
- nomem:
- free (entry); ____;____;____;____;____;____;
- return 0;
-}
-
-/** => zzip_entry_findfile
- *
- * This function takes an existing "entry" in the central root directory
- * (e.g. from zzip_entry_findfirst) and moves it to point to the next entry.
- * On error it returns 0, otherwise the old entry. If no further match is
- * found then null is returned and the entry already free()d. If you want
- * to stop searching for matches before that case then please call
- * => zzip_entry_free on the cursor struct ZZIP_ENTRY.
- */
-zzip__new__ ZZIP_ENTRY*
-zzip_entry_findnext(ZZIP_ENTRY* _zzip_restrict entry)
-{
- if (! entry) return entry;
- if (! zzip_disk_entry_check_magic (entry)) goto err;
- ___ zzip_off_t seek =
- entry->headseek + zzip_disk_entry_sizeto_end (disk_(entry));
- if (seek + (zzip_off_t) sizeof(*disk_(entry)) > entry->disksize) goto err;
-
- fseeko (entry->diskfile, seek, SEEK_SET);
- fread (disk_(entry), 1, sizeof(*disk_(entry)), entry->diskfile);
- entry->headseek = seek;
- if (! zzip_disk_entry_check_magic (entry)) goto err;
- if (prescan_entry(entry)) goto err;
- return entry;
- err:
- zzip_entry_free (entry);
- return 0; ____;
-}
-
-/** => zzip_entry_findfile
- * this function releases the malloc()ed areas needed for zzip_entry, the
- * pointer is invalid afterwards. This function has #define synonyms of
- * zzip_entry_findlast(), zzip_entry_findlastfile(), zzip_entry_findlastmatch()
- */
-int
-zzip_entry_free(ZZIP_ENTRY* entry)
-{
- if (! entry) return 0;
- prescan_clear (entry);
- free (entry);
- return 1;
-}
-
-/** search for files in the (fseeko) zip central directory
- *
- * This function is given a filename as an additional argument, to find the
- * disk_entry matching a given filename. The compare-function is usually
- * strcmp or strcasecmp or perhaps strcoll, if null then strcmp is used.
- * - use null as argument for "old"-entry when searching the first
- * matching entry, otherwise the last returned value if you look for other
- * entries with a special "compare" function (if null then a doubled search
- * is rather useless with this variant of _findfile). If no further entry is
- * found then null is returned and any "old"-entry gets already free()d.
- */
-zzip__new__ ZZIP_ENTRY*
-zzip_entry_findfile(FILE* disk, char* filename,
- ZZIP_ENTRY* _zzip_restrict entry,
- zzip_strcmp_fn_t compare)
-{
- if (! filename || ! disk) return 0;
- entry = ( ! entry ) ? zzip_entry_findfirst (disk)
- : zzip_entry_findnext (entry);
- if (! compare) compare = (zzip_strcmp_fn_t)(strcmp);
-
- for (; entry ; entry = zzip_entry_findnext (entry))
- { /* filenames within zip files are often not null-terminated! */
- char* realname = zzip_entry_strdup_name (entry);
- if (! realname) continue;
- if (! compare (filename, realname)) {
- free (realname); return entry;
- } else {
- free (realname); continue;
- }
- }
- return 0;
-}
-
-#ifdef ZZIP_HAVE_FNMATCH_H
-#define _zzip_fnmatch fnmatch
-# ifdef FNM_CASEFOLD
-# define _zzip_fnmatch_CASEFOLD FNM_CASEFOLD
-# else
-# define _zzip_fnmatch_CASEFOLD 0
-# endif
-#else
-# define _zzip_fnmatch_CASEFOLD 0
-/* if your system does not have fnmatch, we fall back to strcmp: */
-static int _zzip_fnmatch(char* pattern, char* string, int flags)
-{
- puts ("<zzip:strcmp>");
- return strcmp (pattern, string);
-}
-#endif
-
-/** => zzip_entry_findfile
- *
- * This function uses a compare-function with an additional argument
- * and it is called just like fnmatch(3) from POSIX.2 AD:1993), i.e.
- * the argument filespec first and the ziplocal filename second with
- * the integer-flags put in as third to the indirect call. If the
- * platform has fnmatch available then null-compare will use that one
- * and otherwise we fall back to mere strcmp, so if you need fnmatch
- * searching then please provide an implementation somewhere else.
- * - use null as argument for "after"-entry when searching the first
- * matching entry, or the last disk_entry return-value to find the
- * next entry matching the given filespec. If no further entry is
- * found then null is returned and any "old"-entry gets already free()d.
- */
-zzip__new__ ZZIP_ENTRY*
-zzip_entry_findmatch(FILE* disk, char* filespec,
- ZZIP_ENTRY* _zzip_restrict entry,
- zzip_fnmatch_fn_t compare, int flags)
-{
- if (! filespec || ! disk) return 0;
- entry = ( ! entry ) ? zzip_entry_findfirst (disk)
- : zzip_entry_findnext (entry);
- if (! compare) compare = (zzip_fnmatch_fn_t) _zzip_fnmatch;
-
- for (; entry ; entry = zzip_entry_findnext (entry))
- { /* filenames within zip files are often not null-terminated! */
- char* realname = zzip_entry_strdup_name (entry);
- if (! realname) continue;
- if (! compare (filespec, realname, flags)) {
- free (realname); return entry;
- } else {
- free (realname); continue;
- }
- }
- return 0;
-}
-
-/* ====================================================================== */
-
-/**
- * typedef struct zzip_disk_file ZZIP_ENTRY_FILE;
- */
-struct zzip_entry_file /* : zzip_file_header */
-{
- struct zzip_file_header header; /* fopen detected header */
- ZZIP_ENTRY* entry; /* fopen entry */
- zzip_off_t data; /* for stored blocks */
- zzip_size_t avail; /* memorized for checks on EOF */
- zzip_size_t compressed; /* compressed flag and datasize */
- zzip_size_t dataoff; /* offset from data start */
- z_stream zlib; /* for inflated blocks */
- unsigned char buffer[PAGESIZE]; /* work buffer for inflate algorithm */
-};
-
-/** open a file within a zip disk for reading
- *
- * This function does take an "entry" argument and copies it (or just takes
- * it over as owner) to a new ZZIP_ENTRY_FILE handle structure. That
- * structure contains also a zlib buffer for decoding. This function does
- * seek to the file_header of the given "entry" and validates it for the
- * data buffer following it. We do also prefetch some data from the data
- * buffer thereby trying to match the disk pagesize for faster access later.
- * The => zzip_entry_fread will then read in chunks of pagesizes which is
- * the size of the internal readahead buffer. If an error occurs then null
- * is returned.
- */
-zzip__new__ ZZIP_ENTRY_FILE*
-zzip_entry_fopen (ZZIP_ENTRY* entry, int takeover)
-{
- if (! entry) return 0;
- if (! takeover) {
- ZZIP_ENTRY* found = malloc (sizeof(*entry));
- if (! found) return 0;
- memcpy (found, entry, sizeof(*entry)); /* prescan_copy */
- found->tail = malloc (found->tailalloc);
- if (! found->tail) { free (found); return 0; }
- memcpy (found->tail, entry->tail, entry->tailalloc);
- entry = found;
- }
- ___ ZZIP_ENTRY_FILE* file = malloc(sizeof(*file));
- if (! file) goto fail1;
- file->entry = entry;
- if (! zzip_entry_fread_file_header (entry, &file->header))
- goto fail2;
- file->avail = zzip_file_header_usize (&file->header);
- file->data = zzip_entry_data_offset (entry);
- file->dataoff = 0;
-
- if (! file->avail || zzip_file_header_data_stored (&file->header))
- { file->compressed = 0; return file; }
-
- file->compressed = zzip_file_header_csize (&file->header);
- file->zlib.opaque = 0;
- file->zlib.zalloc = Z_NULL;
- file->zlib.zfree = Z_NULL;
-
- ___ zzip_off_t seek = file->data;
- seek += sizeof(file->buffer); seek -= seek & (sizeof(file->buffer)-1);
- assert (file->data < seek); /* pre-read to next PAGESIZE boundary... */
- fseeko (file->entry->diskfile, file->data + file->dataoff, SEEK_SET);
- file->zlib.next_in = file->buffer;
- file->zlib.avail_in = fread (file->buffer, 1, seek - file->data,
- file->entry->diskfile);
- file->dataoff += file->zlib.avail_in; ____;
-
- if (! zzip_file_header_data_deflated (&file->header)
- || inflateInit2 (& file->zlib, -MAX_WBITS) != Z_OK) goto fail2;
-
- return file;
- fail2:
- free (file);
- fail1:
- zzip_entry_free (entry);
- return 0; ____;
-}
-
-/** => zzip_entry_fopen
- *
- * This function opens a file found by name, so it does a search into
- * the zip central directory with => zzip_entry_findfile and whatever
- * is found first is given to => zzip_entry_fopen
- */
-zzip__new__ ZZIP_ENTRY_FILE*
-zzip_entry_ffile (FILE* disk, char* filename)
-{
- ZZIP_ENTRY* entry = zzip_entry_findfile (disk, filename, 0, 0);
- if (! entry) return 0;
- return zzip_entry_fopen (entry, 1);
-}
-
-
-/** => zzip_entry_fopen
- *
- * This function reads more bytes into the output buffer specified as
- * arguments. The return value is null on eof or error, the stdio-like
- * interface can not distinguish between these so you need to check
- * with => zzip_entry_feof for the difference.
- */
-zzip_size_t
-zzip_entry_fread (void* ptr, zzip_size_t sized, zzip_size_t nmemb,
- ZZIP_ENTRY_FILE* file)
-{
- if (! file) return 0;
- ___ zzip_size_t size = sized*nmemb;
- if (! file->compressed) {
- if (size > file->avail) size = file->avail;
- fread (ptr, 1, size, file->entry->diskfile);
- file->dataoff += size;
- file->avail -= size;
- return size;
- }
-
- file->zlib.avail_out = size;
- file->zlib.next_out = ptr;
- ___ zzip_size_t total_old = file->zlib.total_out;
- while (1) {
- if (! file->zlib.avail_in) {
- size = file->compressed - file->dataoff;
- if (size > sizeof(file->buffer)) size = sizeof(file->buffer);
- /* fseek (file->data + file->dataoff, file->entry->diskfile); */
- file->zlib.avail_in = fread (file->buffer, 1, size,
- file->entry->diskfile);
- file->zlib.next_in = file->buffer;
- file->dataoff += file->zlib.avail_in;
- }
- if (! file->zlib.avail_in) return 0;
-
- ___ int err = inflate (& file->zlib, Z_NO_FLUSH);
- if (err == Z_STREAM_END)
- file->avail = 0;
- else if (err == Z_OK)
- file->avail -= file->zlib.total_out - total_old;
- else
- return 0;
- ____;
- if (file->zlib.avail_out && ! file->zlib.avail_in) continue;
- return file->zlib.total_out - total_old;
- }____;____;
-}
-
-/** => zzip_entry_fopen
- * This function releases any zlib decoder info needed for decompression
- * and dumps the ZZIP_ENTRY_FILE struct then.
- */
-int
-zzip_entry_fclose (ZZIP_ENTRY_FILE* file)
-{
- if (! file) return 0;
- if (file->compressed)
- inflateEnd (& file->zlib);
- zzip_entry_free (file->entry);
- free (file);
- return 0;
-}
-
-/** => zzip_entry_fopen
- *
- * This function allows to distinguish an error from an eof condition.
- * Actually, if we found an error but we did already reach eof then we
- * just keep on saying that it was an eof, so the app can just continue.
- */
-int
-zzip_entry_feof (ZZIP_ENTRY_FILE* file)
-{
- return ! file || ! file->avail;
-}