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+
+/*
+ * The write-support in zziplib is not a full-flegded interface to the
+ * internals that zip file-header or zip archive an contain. It's
+ * primary use goes for savegames or transfer `pack-n-go` archives
+ * where time-stamps are rather unimportant. Here we can create an
+ * archive with filenames and their data portions, possibly obfuscated.
+ *
+ * DONT USE THIS
+ *
+ * The write support is supposed to be added directly into the main
+ * zziplib but it has not been implemented so far. It does however
+ * export the relevant call entries which will return EROFS (read-only
+ * filesystem) in case they are being called. That allows later programs
+ * to start up with earlier versions of zziplib that can only read ZIPs.
+ *
+ * Author:
+ * Guido Draheim <guidod@gmx.de>
+ *
+ * Copyright (c) 2003 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 _ZZIP_WRITE_SOURCE
+
+#if defined DDDD || defined DDDDD || defined DDDDDD || defined DDDDDDD
+#define _ZZIP_ENABLE_WRITE
+#else /* per default, we add support for passthrough to posix write */
+#define _ZZIP_POSIX_WRITE
+#endif
+
+#include <zzip/write.h> /* #includes <zzip/lib.h> */
+#include <zzip/file.h>
+
+#include <string.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <ctype.h>
+
+#ifdef ZZIP_HAVE_DIRECT_H
+#include <direct.h>
+#endif
+
+#include <zzip/format.h>
+#include <zzip/plugin.h>
+#include <zzip/__debug.h>
+
+#define ___ {
+#define ____ }
+
+#ifndef EROFS
+# ifdef ENOSYS
+#define EROFS ENOSYS
+# else
+#define EROFS EPERM
+#endif
+#endif
+
+/* try real zlib routines for writing ? very experimental, very very ex... */
+#ifndef _ZZIP_ENABLE_WRITE
+#define _ZZIP_TRY 0
+#else
+#define _ZZIP_TRY 1
+#endif
+
+/* btw, is there any system that did define those different ? get away.. */
+# ifndef S_IWGRP
+# define S_IWGRP 00020
+# endif
+# ifndef S_IRWXO
+# define S_IRWXO 00007
+# endif
+
+# ifdef ZZIP_HAVE_DIRECT_H
+# define _mkdir(a,b) mkdir(a)
+# else
+# define _mkdir mkdir
+# endif
+
+/** create a new zip archive for writing
+ *
+ * This function will create a new zip archive. The returned parameter
+ * is a new "zzip dir" handle that should be saved to a variable so it
+ * can be used a base argument for => zzip_mkdir and => zzip_creat calls.
+ * The returned handle represents a zip central directory that must be
+ * saved to disk using => zzip_closedir.
+ *
+ * Returns null on error and sets errno. Remember, according to posix
+ * the => creat(2) call is equivalent to
+ open (path, O_WRONLY | O_CREAT | O_TRUNC, o_mode)
+ * so any previous zip-archive will be overwritten unconditionally and
+ * EEXIST errors from => mkdir(2) are suppressed. (fixme: delete the
+ * given subtree? like suggested by O_TRUNC? not done so far!)
+ */
+ZZIP_DIR *
+zzip_dir_creat(zzip_char_t * name, int o_mode)
+{
+ return zzip_dir_creat_ext_io(name, o_mode, 0, 0);
+}
+
+/** => zzip_dir_creat
+ *
+ * If the third argument "ext" has another special meaning here, as it
+ * is used to ensure that a given zip-file is created with the first entry
+ * of the ext-list appended as an extension unless the file-path already
+ * ends with a file-extension registered in the list. Therefore {"",0}
+ * matches all files and creates them as zip-archives under the given
+ * nonmodified name. (Some magic here? If the path ends in the path
+ * separator then make a real directory even in the presence of ext-list?)
+ *
+ * This function is not yet implemented, check for #def ZZIP_NO_CREAT
+ * Write-support will extend => zzip_closedir with semantics to finalize the
+ * zip-archive by writing the zip-trailer and closing the archive file.
+ */
+ZZIP_DIR *
+zzip_dir_creat_ext_io(zzip_char_t * name, int o_mode,
+ zzip_strings_t * ext, zzip_plugin_io_t io)
+{
+ if (! io)
+ io = zzip_get_default_io();
+
+ if (io != zzip_get_default_io())
+ {
+ /* the current io-structure does not contain a "write" entry,
+ * and therefore this parameter is useless. Anyone to expect
+ * some behavior should be warned, so here we let the function
+ * fail bluntly - and leaving the recovery to the application
+ */
+ errno = EINVAL;
+ return 0;
+ }
+
+
+ if (! _ZZIP_TRY)
+ {
+ /* not implemented - however, we respect that a null argument to
+ * zzip_mkdir and zzip_creat works, so we silently still do the mkdir
+ */
+ if (! _mkdir(name, o_mode) || errno == EEXIST)
+ errno = EROFS;
+ return 0;
+ } else
+ {
+# define MAX_EXT_LEN 10
+ ZZIP_DIR *dir = zzip_dir_alloc(ext);
+ int name_len = strlen(name);
+ dir->realname = malloc(name_len + MAX_EXT_LEN);
+ if (! dir->realname)
+ goto error;
+
+ memcpy(dir->realname, name, name_len + 1);
+ ___ int fd =
+ __zzip_try_open(dir->realname, O_EXCL | O_TRUNC | O_WRONLY, ext,
+ io);
+ if (fd != -1)
+ { dir->fd = fd; return dir; }
+
+ ___ zzip_strings_t *exx = ext;
+ int exx_len;
+ for (; *exx; exx++)
+ {
+ if ((exx_len = strlen(*exx) + 1) <= name_len &&
+ ! memcmp(dir->realname + (name_len - exx_len), *exx, exx_len))
+ break; /* keep unmodified */
+ exx++;
+ if (*exx)
+ continue;
+
+ if (! (exx_len = strlen(*exx)) || exx_len >= MAX_EXT_LEN)
+ break;
+ memcpy(dir->realname + name_len, exx, exx_len); /* append! */
+ }
+ ____;
+ fd = io->fd.open(dir->realname, O_CREAT | O_TRUNC | O_WRONLY, o_mode);
+ dir->realname[name_len] = '\0'; /* keep ummodified */
+ if (fd != -1)
+ { dir->fd = fd; return dir; }
+ error:
+ zzip_dir_free(dir);
+ return 0;
+ ____;
+ }
+}
+
+/** create a new archive area for writing
+ *
+ * This function will create a new archive area. This may either be a
+ * a new zip archive or a new directory in the filesystem. The returned
+ * parameter is a new "zzip dir" handle that should be saved to a variable
+ * so it can be used a base argument for => zzip_file_mkdir and
+ * => zzip_file_creat calls. The returned handle wraps both possibilities,
+ * it can be representing a zip central directory that must be
+ * saved to disk using => zzip_closedir or it is just a handle for the
+ * name of the real directory that still must be run through
+ * => zzip_closedir to release the wrapper around the directory name.
+ *
+ * The magic is pushed through the o_mode argument. Using a mode that
+ * has no group-write bit set (S_IWGRP = 0040) then the file is
+ * created as a zip directory. Note that this is unabridged of any
+ * umask value in the system where the argument to this function could
+ * be 0775 but with an umask of 0755 it turns out as 0755 for a real
+ * directory. Using 0755 directly would not create it as a real directory
+ * but as a zip archive handle.
+ *
+ * This function is not yet implemented, check for #def ZZIP_NO_CREAT
+ * Write-support will extend => zzip_closedir with semantics to finalize the
+ * zip-archive by writing the zip-trailer and closing the archive file.
+ *
+ * Returns null on error and sets errno. Remember, according to posix
+ * the => creat(2) call is equivalent to
+ open (path, O_WRONLY | O_CREAT | O_TRUNC, o_mode)
+ * so any previous zip-archive will be overwritten unconditionally and
+ * EEXIST errors from => mkdir(2) are suppressed. (fixme: delete the
+ * given subtree? like suggested by O_TRUNC? not done so far!)
+ */
+ZZIP_DIR *
+zzip_createdir(zzip_char_t * name, int o_mode)
+{
+ if (o_mode & S_IWGRP)
+ {
+ if (-1 == _mkdir(name, o_mode) && errno != EEXIST) /* fail */
+ return 0;
+ return zzip_opendir(name);
+ } else
+ return zzip_dir_creat(name, o_mode);
+}
+
+/** => zzip_file_creat also: mkdir(2), creat(2), zzip_dir_creat
+ *
+ * This function has an additional primary argument over the posix
+ * mkdir(2) - if it is null then this function behaves just like
+ * posix mkdir(2). The zzip_dir argument can be set to the result
+ * of a => zzip_createdir which allows for some magic that the
+ * given directory name is created as an entry in the zip archive.
+ *
+ * If the given dir name argument is not within the basepath of
+ * the zip central directory then a real directory is created.
+ * Any EEXIST errors are not suppressed unlike with => zzip_createdir
+ *
+ * Standard usage accepts a global/threaded/modular ZZIP_DIR pointer
+ * for all zip archive operations like in:
+ ZZIP_DIR* zip = zzip_createdir (sysconfpath, 0755, zip);
+ zzip_file_mkdir (zip, filepath[i], 0755);
+ ZZIP_FILE* file = zzip_file_creat (zip, filename[i], 0644);
+ zzip_write (file, buf, len);
+ zzip_close (file); file = 0;
+ zzip_closedir (zip); zip = 0;
+ *
+ * compare with => zzip_mkdir inline macro which allows to
+ * collapse the examples script to
+ #define zzip_savefile myproject_saveconfig
+ #include <zzip/zzip.h>
+ ZZIP_DIR* zzip_savefile = zzip_createdir (sysconfpath, 0755);
+ zzip_mkdir (filepath[i], 0755);
+ ZZIP_FILE* file = zzip_creat(filepath[i], 0644);
+ zzip_write (file, buf, len);
+ zzip_close (file); file = 0;
+ zzip_closedir (zip_savefile);
+ */
+int
+zzip_file_mkdir(ZZIP_DIR * dir, zzip_char_t * name, int o_mode)
+{
+ if (! dir)
+ return _mkdir(name, o_mode);
+
+ if (! _ZZIP_TRY)
+ { /* not implemented */
+ errno = EROFS;
+ return -1;
+ } else
+ {
+ errno = EROFS;
+ return -1;
+ }
+}
+
+/** start next file entry in a zip archive
+ *
+ * This function will create a new file within a zzip archive, the
+ * one given as the primary argument and additionally to the posix
+ * creat(2) - just like zzip_mkdir has an additional argument over
+ * the posix mkdir(2) spec. For this function the primary parameter
+ * can be null as well thereby creating a real file instead of a new
+ * one inside the zip-archive otherwise given. If the primary parameter is
+ * not null but wraps a real directory then all new files are also real.
+ *
+ * This function is not yet implemented, check for #def ZZIP_NO_CREAT
+ *
+ * Returns NULL on an error setting errno, and opening a file _within_
+ * a zip archive using O_RDONLY (and similar stuff) will surely lead to
+ * an error.
+ */
+ZZIP_FILE *
+zzip_file_creat(ZZIP_DIR * dir, zzip_char_t * name, int o_mode)
+{
+ if (! dir)
+ return zzip_open(name, o_mode);
+
+ if (! _ZZIP_TRY)
+ { /* not implemented */
+ errno = EROFS;
+ return 0;
+ } else
+ {
+ errno = EROFS;
+ return 0;
+ }
+}
+
+/** write to zzip storage also: write(2), zlib(3)
+ *
+ * This function will write data to a file descriptor. If the file
+ * descriptor represents a real file then it will be forwarded to
+ * call posix => write(2) directly. If it is a descriptor for a
+ * file within a zip directory then the data will be "deflated"
+ * using => zlib(3) and appended to the zip archive file.
+ */
+zzip_ssize_t
+zzip_write(ZZIP_FILE * file, const void *ptr, zzip_size_t len)
+{
+ if (zzip_file_real(file))
+ return write(zzip_realfd(file), ptr, len);
+ else
+ return zzip_file_write(file, ptr, len);
+}
+
+/** => zzip_write also: zzip_file_creat
+ *
+ * This function will write data to a file descriptor inside a zip
+ * archive. The data will be "deflated" using => zlib(3) compression
+ * and appended to the end of the zip archive file. Only one file
+ * descriptor may be open per zzip_dir archive handle (fifo-like).
+ *
+ * This function is not yet implemented, check for #def ZZIP_NO_CREAT
+ * It returns immediately -1 and sets errno=EROFS for indication.
+ */
+zzip_ssize_t
+zzip_file_write(ZZIP_FILE * file, const void *ptr, zzip_size_t len)
+{
+ if (! _ZZIP_TRY)
+ { /* not implemented */
+ errno = EROFS;
+ return -1;
+ } else
+ {
+ /* add calls to zlib here... */
+ errno = EROFS;
+ return -1;
+ }
+}
+
+/** => zzip_write
+ * This function is the stdc variant for writing and the arguments
+ * are forwarded to => zzip_write - the return value is floored to
+ * null as for STDC spec but there is no zzip_ferror call so far
+ * for the zziplib (later? is it actually needed?).
+ *
+ * This function is not yet implemented, check for #def ZZIP_NO_CREAT
+ * Write-support extends => zzip_close with semantics to write out a
+ * file-trailer to the zip-archive leaving a name/offset marker in
+ * the (still-open) ZZIP_DIR handle.
+ */
+zzip_size_t
+zzip_fwrite(const void *ptr, zzip_size_t len, zzip_size_t multiply,
+ ZZIP_FILE * file)
+{
+ zzip_ssize_t value = zzip_write(file, ptr, len * multiply);
+ if (value == -1)
+ value = 0;
+ return (zzip_size_t) value;
+}
+
+#if 0 /* pure documentation */
+
+/** create a zipped file/directory also: zzip_dir_creat, mkdir(2)
+ *
+ * This function creates a directory entry in the default zip-archive.
+ * If you did not specify a "#define zzip_savefile somevar"
+ * then the default zip-archive is null and all directories are
+ * created as real directories in the filesystem. This function is
+ * really a preprocessor macro or preferably an inline function
+ * around => zzip_file_mkdir, there is no such symbol generated
+ * into the library. The prototype is modelled after the posix
+ * => mkdir(2) call.
+ #ifndef zzip_savefile
+ #define zzip_savefile 0
+ #endif
+ #define zzip_mkdir(name,mode) \ -
+ zzip_file_mkdir(zzip_savefile,name,mode)
+ *
+ */
+int inline
+zzip_mkdir(zzip_char_t * name, int o_mode)
+{
+ return zzip_file_creat(zzip_savefile, name, mode);
+}
+#endif
+
+#if 0 /* pure documentation */
+
+/** => zzip_mkdir also: creat(2), zzip_start
+ *
+ * This function creates a file in the default zip-archive.
+ * If you did not specify a "#define zzip_savefile somevar"
+ * then the default zip-archive is null and all files are created
+ * as real files. This function is really a preprocessor macro
+ * or preferably an inline function around => zzip_file_creat,
+ * there is no such symbol generated into the library. The prototype
+ * is modelled after the posix => creat(2) call.
+ #ifndef zzip_savefile
+ #define zzip_savefile 0
+ #endif
+ #define zzip_creat(name,mode) \ -
+ zzip_file_creat(zzip_savefile,name,mode)
+ */
+ZZIP_FILE *inline
+zzip_creat(zzip_char_t * name, int o_mode)
+{
+ return zzip_file_creat(zzip_savefile, name, mode);
+}
+#endif
+
+
+#if 0 /* pure documentation */
+
+/** start writing to the magic zzip_savefile also: zzip_creat, zzip_write
+ *
+ * open a zip archive for writing via the magic zzip_savefile macro
+ * variable. The name and mode are given to => zzip_createdir and
+ * the result is stored into => zzip_savefile - if the => zzip_savefile
+ * did already have a zzip_dir handle then it is automatically
+ * finalized with => zzip_sync and the handle closed and the
+ * zzip_savefile variable reused for the new zip archive just started
+ * with this call. - This function is really a preprocessor macro
+ * or preferably an inline function around => zzip_dir_create, there
+ * is no such symbol generated into the library.
+ #ifndef zzip_savefile
+ #define zzip_savefile 0
+ #endif
+ #define zzip_start(name,mode,ext) \ -
+ { if (zzip_savefile) zzip_closedir(zzip_savefile); \ -
+ zzip_savefile = zzip_createdir(name,mode,ext); }
+ * This function returns null on error or a zzip_dir handle on
+ * success. It is perfectly okay to continue with a null in the
+ * zzip_savefile variable since it makes subsequent calls to
+ * => zzip_creat and => zzip_mkdir to run as => creat(2) / => mkdir(2)
+ * on the real filesystem.
+ */
+void inline
+zzip_mkfifo(zzip_char_t * name, int o_mode)
+{
+ if (zzip_savefile)
+ zzip_closedir(zzip_savefile);
+ zzip_savefile = zzip_createdir(name, o_mode);
+}
+#endif
+
+#if 0 /* pure documentation */
+
+/** => zzip_mkfifo also: zzip_closedir, sync(2)
+ *
+ * finalize a zip archive thereby writing the central directory to
+ * the end of the file. If it was a real directory then we do just
+ * nothing - even that the prototype of the call itself is modelled
+ * to be similar to the posix => sync(2) call. This function is
+ * really a preprocessor macro or preferably an inline function
+ * around => zzip_closedir, there is no such symbol generated
+ * into the library.
+ #ifndef zzip_savefile
+ #define zzip_savefile 0
+ #endif
+ #define zzip_sync(name,mode) \ -
+ { zzip_closedir(zzip_savefile); zzip_savefile = 0; }
+ *
+ */
+void inline
+zzip_sync(void)
+{
+ zzip_closedir(zzip_savefile);
+ zzip_savefile = 0;
+}
+#endif
+
+/*
+ * Local variables:
+ * c-file-style: "stroustrup"
+ * End:
+ */
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