4 * Guido Draheim <guidod@gmx.de>
5 * Tomi Ollila <Tomi.Ollila@iki.fi>
7 * Copyright (c) 1999,2000,2001,2002,2003 Guido Draheim
9 * use under the restrictions of the
10 * Lesser GNU General Public License
11 * or alternatively the restrictions
12 * of the Mozilla Public License 1.1
15 #include <zzip/lib.h> /* exported... */
16 #include <zzip/file.h>
24 #include <zzip/format.h>
25 #include <zzip/fetch.h>
26 #include <zzip/__debug.h>
29 # if defined ZZIP_HAVE_IO_H
30 # include <io.h> /* tell */
32 # define tell(fd) lseek(fd,0,SEEK_CUR)
35 #define tells(fd) seeks(fd,0,SEEK_CUR)
39 * the direct function of => zzip_close(fp). it will cleanup the
40 * inflate-portion of => zlib and free the structure given.
42 * it is called quite from the error-cleanup parts
43 * of the various => _open functions.
45 * the .refcount is decreased and if zero the fp->dir is closed just as well.
48 zzip_file_close(ZZIP_FILE * fp)
51 ZZIP_DIR *dir = fp->dir;
54 inflateEnd(&fp->d_stream); /* inflateEnd() can be called many times */
56 if (dir->cache.locked == NULL)
57 dir->cache.locked = &self;
61 if (dir->cache.locked == &self && dir->cache.buf32k == NULL)
62 dir->cache.buf32k = fp->buf32k;
67 if (dir->currentfp == fp)
68 dir->currentfp = NULL;
71 /* ease to notice possible dangling reference errors */
72 memset(fp, 0, sizeof(*fp));
74 if (dir->cache.locked == &self && dir->cache.fp == NULL)
79 if (dir->cache.locked == &self)
80 dir->cache.locked = NULL;
83 return zzip_dir_close(dir);
90 zzip_file_saveoffset(ZZIP_FILE * fp)
95 zzip_off_t off = fp->io->fd.seeks(fd, 0, SEEK_CUR);
106 /* user-definition */
107 #ifndef ZZIP_BACKSLASH_DIRSEP
108 #if defined HAVE_WINDOWS_H || defined ZZIP_HAVE_WINDOWS_H || defined _WIN32
109 #define ZZIP_BACKSLASH_DIRSEP 1
110 #elif defined ZZIP_CHECK_BACKSLASH_DIRSEPARATOR
111 #define ZZIP_BACKSLASH_DIRSEP 1
113 #define ZZIP_BACKSLASH_DIRSEP 0
118 strrchr_basename(zzip_char_t* name)
120 register zzip_char_t *n = strrchr(name, '/');
126 dirsep_basename(zzip_char_t* name)
128 register zzip_char_t *n = strrchr(name, '/');
130 if (ZZIP_BACKSLASH_DIRSEP)
132 register zzip_char_t *m = strrchr(name, '\\');
133 if (!n || (m && n < m))
141 #if defined strcasecmp
142 #define dirsep_strcasecmp strcasecmp
145 dirsep_strcasecmp(zzip_char_t * s1, zzip_char_t * s2)
147 /* ASCII tolower - including mapping of backslash in normal slash */
148 static const char mapping[] = "@abcdefghijklmnopqrstuvwxyz[/]^_";
153 c1 = (int) (unsigned char) *s1;
154 c2 = (int) (unsigned char) *s2;
155 if ((c1 & 0xE0) == 0x40)
156 c1 = mapping[c1 & 0x1f];
157 if ((c2 & 0xE0) == 0x40)
158 c2 = mapping[c2 & 0x1f];
165 return (((int) (unsigned char) *s1) - ((int) (unsigned char) *s2));
169 static int zzip_inflate_init(ZZIP_FILE *, struct zzip_dir_hdr *);
172 * open an => ZZIP_FILE from an already open => ZZIP_DIR handle. Since
173 * we have a chance to reuse a cached => buf32k and => ZZIP_FILE memchunk
174 * this is the best choice to unpack multiple files.
176 * Note: the zlib supports 2..15 bit windowsize, hence we provide a 32k
177 * memchunk here... just to be safe.
179 * On error it returns null and sets errcode in the ZZIP_DIR.
182 zzip_file_open(ZZIP_DIR * dir, zzip_char_t * name, int o_mode)
185 zzip_error_t err = 0;
186 struct zzip_file *fp = 0;
187 struct zzip_dir_hdr *hdr = dir->hdr0;
188 int (*filename_strcmp) (zzip_char_t *, zzip_char_t *);
189 zzip_char_t* (*filename_basename)(zzip_char_t*);
191 filename_strcmp = (o_mode & ZZIP_CASELESS) ? dirsep_strcasecmp : strcmp;
192 filename_basename = (o_mode & ZZIP_CASELESS) ? dirsep_basename : strrchr_basename;
196 if (! dir->fd || dir->fd == -1)
197 { dir->errcode = EBADF; return NULL; }
199 { dir->errcode = ENOENT; return NULL; }
201 if (o_mode & ZZIP_NOPATHS)
202 name = filename_basename(name);
206 register zzip_char_t *hdr_name = hdr->d_name;
208 if (o_mode & ZZIP_NOPATHS)
209 hdr_name = filename_basename(hdr_name);
211 HINT4("name='%s', compr=%d, size=%d\n",
212 hdr->d_name, hdr->d_compr, hdr->d_usize);
214 if (! filename_strcmp(hdr_name, name))
216 switch (hdr->d_compr)
219 case 8: /* inflate */
222 { err = ZZIP_UNSUPP_COMPR; goto error; }
225 if (dir->cache.locked == NULL)
226 dir->cache.locked = &self;
228 if (dir->cache.locked == &self && dir->cache.fp)
231 dir->cache.fp = NULL;
232 /* memset(zfp, 0, sizeof *fp); cleared in zzip_file_close() */
235 if (! (fp = (ZZIP_FILE *) calloc(1, sizeof(*fp))))
236 { err = ZZIP_OUTOFMEM; goto error; }
243 if (dir->cache.locked == &self && dir->cache.buf32k)
245 fp->buf32k = dir->cache.buf32k;
246 dir->cache.buf32k = NULL;
249 if (! (fp->buf32k = (char *) malloc(ZZIP_32K)))
250 { err = ZZIP_OUTOFMEM; goto error; }
253 if (dir->cache.locked == &self)
254 dir->cache.locked = NULL;
256 * In order to support simultaneous open files in one zip archive
257 * we'll fix the fd offset when opening new file/changing which
261 if (zzip_file_saveoffset(dir->currentfp) < 0)
262 { err = ZZIP_DIR_SEEK; goto error; }
264 fp->offset = hdr->d_off;
267 if (dir->io->fd.seeks(dir->fd, hdr->d_off, SEEK_SET) < 0)
268 { err = ZZIP_DIR_SEEK; goto error; }
271 /* skip local header - should test tons of other info,
272 * but trust that those are correct */
273 zzip_ssize_t dataoff;
274 struct zzip_file_header *p = (void *) fp->buf32k;
276 dataoff = dir->io->fd.read(dir->fd, (void *) p, sizeof(*p));
277 if (dataoff < (zzip_ssize_t) sizeof(*p))
278 { err = ZZIP_DIR_READ; goto error; }
279 if (! zzip_file_header_check_magic(p)) /* PK\3\4 */
280 { err = ZZIP_CORRUPTED; goto error; }
282 dataoff = zzip_file_header_sizeof_tail(p);
284 if (dir->io->fd.seeks(dir->fd, dataoff, SEEK_CUR) < 0)
285 { err = ZZIP_DIR_SEEK; goto error; }
287 fp->dataoffset = dir->io->fd.tells(dir->fd);
288 fp->usize = hdr->d_usize;
289 fp->csize = hdr->d_csize;
292 err = zzip_inflate_init(fp, hdr);
299 if (hdr->d_reclen == 0)
301 hdr = (struct zzip_dir_hdr *) ((char *) hdr + hdr->d_reclen);
302 } /*filename_strcmp */
304 dir->errcode = ZZIP_ENOENT;
314 * call => inflateInit and setup fp's iterator variables,
315 * used by lowlevel => _open functions.
318 zzip_inflate_init(ZZIP_FILE * fp, struct zzip_dir_hdr *hdr)
322 fp->method = hdr->d_compr;
323 fp->restlen = hdr->d_usize;
327 memset(&fp->d_stream, 0, sizeof(fp->d_stream));
329 err = inflateInit2(&fp->d_stream, -MAX_WBITS);
333 fp->crestlen = hdr->d_csize;
343 * This function closes the given ZZIP_FILE handle.
345 * If the ZZIP_FILE wraps a normal stat'fd then it is just that int'fd
346 * that is being closed and the otherwise empty ZZIP_FILE gets freed.
349 zzip_fclose(ZZIP_FILE * fp)
353 if (! fp->dir) /* stat fd */
354 { int r = fp->io->fd.close(fp->fd); free(fp); return r; }
356 return zzip_file_close(fp);
362 zzip_close(ZZIP_FILE * fp)
364 return zzip_fclose(fp);
368 * This functions read data from zip-contained file.
370 * It works like => read(2) and will fill the given buffer with bytes from
371 * the opened file. It will return the number of bytes read, so if the => EOF
372 * is encountered you will be prompted with the number of bytes actually read.
374 * This is the routines that needs the => buf32k buffer, and it would have
375 * need for much more polishing but it does already work quite well.
377 * Note: the 32K buffer is rather big. The original inflate-algorithm
378 * required just that but the latest zlib would work just fine with
382 zzip_file_read(ZZIP_FILE * fp, void *buf, zzip_size_t len)
388 if (! fp || ! fp->dir)
392 l = fp->restlen > len ? len : fp->restlen;
393 if (fp->restlen == 0)
397 * If this is other handle than previous, save current seek pointer
398 * and read the file position of `this' handle.
400 if (dir->currentfp != fp)
402 if (zzip_file_saveoffset(dir->currentfp) < 0
403 || fp->io->fd.seeks(dir->fd, fp->offset, SEEK_SET) < 0)
404 { dir->errcode = ZZIP_DIR_SEEK; return -1; }
406 { dir->currentfp = fp; }
409 /* if more methods is to be supported, change this to `switch ()' */
410 if (fp->method) /* method != 0 == 8, inflate */
412 fp->d_stream.avail_out = l;
413 fp->d_stream.next_out = (unsigned char *) buf;
418 zzip_size_t startlen;
420 if (fp->crestlen > 0 && fp->d_stream.avail_in == 0)
422 zzip_size_t cl = (fp->crestlen < ZZIP_32K ?
423 fp->crestlen : ZZIP_32K);
425 * fp->crestlen > 128 ? 128 : fp->crestlen;
427 zzip_ssize_t i = fp->io->fd.read(dir->fd, fp->buf32k, cl);
431 dir->errcode = ZZIP_DIR_READ;
432 /* or ZZIP_DIR_READ_EOF ? */
436 fp->d_stream.avail_in = i;
437 fp->d_stream.next_in = (unsigned char *) fp->buf32k;
440 startlen = fp->d_stream.total_out;
441 err = inflate(&fp->d_stream, Z_NO_FLUSH);
443 if (err == Z_STREAM_END)
445 else if (err == Z_OK)
446 { fp->restlen -= (fp->d_stream.total_out - startlen); }
448 { dir->errcode = err; return -1; }
450 while (fp->restlen && fp->d_stream.avail_out);
452 return l - fp->d_stream.avail_out;
454 { /* method == 0 -- unstore */
455 rv = fp->io->fd.read(dir->fd, buf, l);
457 { fp->restlen-= rv; }
459 { dir->errcode = ZZIP_DIR_READ; }
465 * This function will read(2) data from a real/zipped file.
467 * the replacement for => read(2) will fill the given buffer with bytes from
468 * the opened file. It will return the number of bytes read, so if the EOF
469 * is encountered you will be prompted with the number of bytes actually read.
471 * If the file-handle is wrapping a stat'able file then it will actually just
472 * perform a normal => read(2)-call, otherwise => zzip_file_read is called
473 * to decompress the data stream and any error is mapped to => errno(3).
476 zzip_read(ZZIP_FILE * fp, void *buf, zzip_size_t len)
481 { return fp->io->fd.read(fp->fd, buf, len); } /* stat fd */
484 register zzip_ssize_t v;
486 v = zzip_file_read(fp, buf, len);
488 { errno = zzip_errno(fp->dir->errcode); }
496 zzip_fread(void *ptr, zzip_size_t size, zzip_size_t nmemb, ZZIP_FILE * file)
500 return zzip_read(file, ptr, size * nmemb) / size;
504 #define ZZIP_WRONLY O_WRONLY
505 #define ZZIP_EXCL O_EXCL
508 #define ZZIP_SYNC O_SYNC
513 #if defined O_NONBLOCK
514 #define ZZIP_NONBLOCK O_NONBLOCK
515 #elif defined O_NDELAY
516 #define ZZIP_NOCTTY O_NDELAY
518 #define ZZIP_NOCTTY 0
521 /* ------------------------------------------------------------------- */
524 * This function will => fopen(3) a real/zipped file.
526 * It has some magic functionality builtin - it will first try to open
527 * the given <em>filename</em> as a normal file. If it does not
528 * exist, the given path to the filename (if any) is split into
529 * its directory-part and the file-part. A ".zip" extension is
530 * then added to the directory-part to create the name of a
531 * zip-archive. That zip-archive (if it exists) is being searched
532 * for the file-part, and if found a zzip-handle is returned.
534 * Note that if the file is found in the normal fs-directory the
535 * returned structure is mostly empty and the => zzip_read call will
536 * use the libc => read(2) to obtain data. Otherwise a => zzip_file_open
537 * is performed and any error mapped to => errno(3).
539 * unlike the posix-wrapper => zzip_open the mode-argument is
540 * a string which allows for more freedom to support the extra
541 * zzip modes called ZZIP_CASEINSENSITIVE and ZZIP_IGNOREPATH.
542 * Currently, this => zzip_fopen call will convert the following
543 * characters in the mode-string into their corrsponding mode-bits:
544 * * <code> "r" : O_RDONLY : </code> read-only
545 * * <code> "b" : O_BINARY : </code> binary (win32 specific)
546 * * <code> "f" : O_NOCTTY : </code> no char device (unix)
547 * * <code> "i" : ZZIP_CASELESS : </code> inside zip file
548 * * <code> "*" : ZZIP_NOPATHS : </code> inside zip file only
549 * all other modes will be ignored for zip-contained entries
550 * but they are transferred for compatibility and portability,
551 * including these extra sugar bits:
552 * * <code> "x" : O_EXCL :</code> fail if file did exist
553 * * <code> "s" : O_SYNC :</code> synchronized access
554 * * <code> "n" : O_NONBLOCK :</code> nonblocking access
555 * * <code> "z#" : compression level :</code> for zlib
556 * * <code> "g#" : group access :</code> unix access bits
557 * * <code> "u#" : owner access :</code> unix access bits
558 * * <code> "o#" : world access :</code> unix access bits
559 * ... the access bits are in traditional unix bit format
560 * with 7 = read/write/execute, 6 = read/write, 4 = read-only.
562 * The default access mode is 0664, and the compression level
563 * is ignored since the lib can not yet write zip files, otherwise
564 * it would be the initialisation value for the zlib deflateInit
565 * where 0 = no-compression, 1 = best-speed, 9 = best-compression.
567 * This function returns a new zzip-handle (use => zzip_close to return
568 * it). On error this function will return null setting => errno(3).
571 zzip_fopen(zzip_char_t * filename, zzip_char_t * mode)
573 return zzip_freopen(filename, mode, 0);
578 * This function receives an additional argument pointing to
579 * a ZZIP_FILE* being already in use. If this extra argument is
580 * null then this function is identical with calling => zzip_fopen
582 * Per default, the old file stream is closed and only the internal
583 * structures associated with it are kept. These internal structures
584 * may be reused for the return value, and this is a lot quicker when
585 * the filename matches a zipped file that is incidently in the very
586 * same zip arch as the old filename wrapped in the stream struct.
588 * That's simply because the zip arch's central directory does not
589 * need to be read again. As an extension for this function, if the
590 * mode-string contains a "q" then the old stream is not closed but
591 * left untouched, instead it is only given as a hint that a new
592 * file handle may share/copy the zip arch structures of the old file
593 * handle if that is possible, i.e when they are in the same zip arch.
595 * This function returns a new zzip-handle (use => zzip_close to return
596 * it). On error this function will return null setting => errno(3).
599 zzip_freopen(zzip_char_t * filename, zzip_char_t * mode, ZZIP_FILE * stream)
617 # define O_NONBLOCK 0
620 for (; *mode; mode++)
625 case '0': case '1': case '2': case '3': case '4':
626 case '5': case '6': case '7': case '8': case '9':
627 continue; /* ignore if not attached to other info */
628 case 'r': o_flags |= mode[1] == '+' ? O_RDWR : O_RDONLY; break;
629 case 'w': o_flags |= mode[1] == '+' ? O_RDWR : O_WRONLY;
630 o_flags |= O_TRUNC; break;
631 case 'b': o_flags |= O_BINARY; break;
632 case 'f': o_flags |= O_NOCTTY; break;
633 case 'i': o_modes |= ZZIP_CASELESS; break;
634 case '*': o_modes |= ZZIP_NOPATHS; break;
635 case 'x': o_flags |= O_EXCL; break;
636 case 's': o_flags |= O_SYNC; break;
637 case 'n': o_flags |= O_NONBLOCK; break;
638 case 'o': o_modes &=~ 07;
639 o_modes |= ((mode[1] - '0')) & 07; continue;
640 case 'g': o_modes &=~ 070;
641 o_modes |= ((mode[1] - '0') << 3) & 070; continue;
642 case 'u': o_modes &=~ 0700;
643 o_modes |= ((mode[1] - '0') << 6) & 0700; continue;
644 case 'q': o_modes |= ZZIP_FACTORY; break;
645 case 'z': /* compression level */
646 continue; /* currently ignored, just for write mode */
653 zzip_open_shared_io(stream, filename, o_flags, o_modes, 0, 0);
655 if (! (o_modes & ZZIP_FACTORY) && stream)
656 zzip_file_close(stream);
663 * This function will => open(2) a real/zipped file
665 * It has some magic functionality builtin - it will first try to open
666 * the given <em>filename</em> as a normal file. If it does not
667 * exist, the given path to the filename (if any) is split into
668 * its directory-part and the file-part. A ".zip" extension is
669 * then added to the directory-part to create the name of a
670 * zip-archive. That zip-archive (if it exists) is being searched
671 * for the file-part, and if found a zzip-handle is returned.
673 * Note that if the file is found in the normal fs-directory the
674 * returned structure is mostly empty and the => zzip_read call will
675 * use the libc => read(2) to obtain data. Otherwise a => zzip_file_open
676 * is performed and any error mapped to => errno(3).
678 * There was a possibility to transfer zziplib-specific openmodes
679 * through o_flags but you should please not use them anymore and
680 * look into => zzip_open_ext_io to submit them down. This function
681 * is shallow in that it just extracts the zzipflags and calls
682 * * <code>zzip_open_ext_io(filename, o_flags, zzipflags|0664, 0, 0) </code>
683 * you must stop using this extra functionality (not well known anyway)
684 * since zzip_open might be later usable to open files for writing
685 * in which case the _EXTRAFLAGS will get in conflict.
687 * compare with => open(2) and => zzip_fopen
690 zzip_open(zzip_char_t * filename, int o_flags)
692 /* backward compatibility */
695 if (o_flags & ZZIP_CASEINSENSITIVE)
696 { o_flags ^= ZZIP_CASEINSENSITIVE; o_modes |= ZZIP_CASELESS; }
697 if (o_flags & ZZIP_IGNOREPATH)
698 { o_flags ^= ZZIP_IGNOREPATH; o_modes |= ZZIP_NOPATHS; }
699 return zzip_open_ext_io(filename, o_flags, o_modes, 0, 0);
702 /* ZZIP_ONLYZIP won't work on platforms with sizeof(int) == 16bit */
703 #if ZZIP_SIZEOF_INT+0 == 2
709 * This function uses explicit ext and io instead of the internal
710 * defaults, setting them to zero is equivalent to => zzip_open
712 * note that the two flag types have been split into an o_flags
713 * (for fcntl-like openflags) and o_modes where the latter shall
714 * carry the zzip_flags and possibly accessmodes for unix filesystems.
715 * Since this version of zziplib can not write zipfiles, it is not
716 * yet used for anything else than zzip-specific modeflags.
718 * This function returns a new zzip-handle (use => zzip_close to return
719 * it). On error this function will return null setting => errno(3).
722 zzip_open_ext_io(zzip_char_t * filename, int o_flags, int o_modes,
723 zzip_strings_t * ext, zzip_plugin_io_t io)
725 return zzip_open_shared_io(0, filename, o_flags, o_modes, ext, io);
730 * This function takes an extra stream argument - if a handle has been
731 * then ext/io can be left null and the new stream handle will pick up
732 * the ext/io. This should be used only in specific environment however
733 * since => zzip_file_real does not store any ext-sequence.
735 * The benefit for this function comes in when the old file handle
736 * was openened from a file within a zip archive. When the new file
737 * is in the same zip archive then the internal zzip_dir structures
738 * will be shared. It is even quicker, as no check needs to be done
739 * anymore trying to guess the zip archive place in the filesystem,
740 * here we just check whether the zip archive's filepath is a prefix
741 * part of the filename to be opened.
743 * Note that this function is also used by => zzip_freopen that
744 * will unshare the old handle, thereby possibly closing the handle.
746 * This function returns a new zzip-handle (use => zzip_close to return
747 * it). On error this function will return null setting => errno(3).
750 zzip_open_shared_io(ZZIP_FILE * stream,
751 zzip_char_t * filename, int o_flags, int o_modes,
752 zzip_strings_t * ext, zzip_plugin_io_t io)
754 if (stream && stream->dir)
757 ext = stream->dir->fileext;
759 io = stream->dir->io;
762 io = zzip_get_default_io();
764 if (o_modes & (ZZIP_PREFERZIP | ZZIP_ONLYZIP))
767 /* prefer an existing real file */
769 zzip_plugin_io_t os = (o_modes & ZZIP_ALLOWREAL)
770 ? zzip_get_default_io() : io;
771 int fd = os->fd.open(filename, o_flags); /* io->fd.open */
775 ZZIP_FILE *fp = calloc(1, sizeof(ZZIP_FILE));
778 { os->fd.close(fd); return 0; } /* io->fd.close */
784 if (o_modes & ZZIP_PREFERZIP)
789 /* if the user had it in place of a normal xopen, then
790 * we better defend this lib against illegal usage */
791 if (o_flags & (O_CREAT | O_WRONLY))
792 { errno = EINVAL; return 0; }
793 if (o_flags & (O_RDWR))
794 { o_flags ^= O_RDWR; o_flags |= O_RDONLY; }
796 /* this is just for backward compatibility -and strictly needed to
797 * prepare ourselves for more options and more options later on... */
798 /*# if (o_modes & ZZIP_CASELESS) { o_flags |= ZZIP_CASEINSENSITIVE; } */
799 /*# if (o_modes & ZZIP_NOPATHS) { o_flags |= ZZIP_IGNOREPATH; } */
801 /* see if we can open a file that is a zip file */
803 char basename[PATH_MAX];
805 int filename_len = strlen(filename);
807 if (filename_len >= PATH_MAX)
808 { errno = ENAMETOOLONG; return 0; }
809 memcpy(basename, filename, filename_len + 1);
811 /* see if we can share the same zip directory */
812 if (stream && stream->dir && stream->dir->realname)
814 zzip_size_t len = strlen(stream->dir->realname);
816 if (! memcmp(filename, stream->dir->realname, len) &&
817 filename[len] == '/' && filename[len + 1])
820 zzip_file_open(stream->dir, filename + len + 1, o_modes);
822 { errno = zzip_errno (stream->dir->errcode); }
827 /* per each slash in filename, check if it there is a zzip around */
828 while ((p = strrchr(basename, '/')))
836 /* i.e. cut at path separator == possible zipfile basename */
837 fd = __zzip_try_open(basename, o_flags | O_RDONLY | O_BINARY,
842 /* found zip-file .... now try to parse it */
843 dir = zzip_dir_fdopen_ext_io(fd, &e, ext, io);
845 { errno = zzip_errno(e); io->fd.close(fd); return 0; }
847 /* (p - basename) is the lenghtof zzip_dir part of the filename */
848 fp = zzip_file_open(dir, filename + (p - basename) + 1, o_modes);
850 { errno = zzip_errno(dir->errcode); }
852 { if (! dir->realname) dir->realname = strdup (basename); }
855 /* note: since (fp) is attached that (dir) will survive */
856 /* but (dir) is implicitly closed on next zzip_close(fp) */
861 if (o_modes & ZZIP_PREFERZIP)
864 { errno = ENOENT; return 0; }
868 #if defined ZZIP_LARGEFILE_RENAME && defined EOVERFLOW && defined PIC
869 #undef zzip_open_shared_io /* zzip_open_shared_io64 */
870 #undef zzip_open_ext_io /* zzip_open_ext_io64 */
871 #undef zzip_opendir_ext_io /* zzip_opendir_ext_io64 */
873 ZZIP_FILE *zzip_open_shared_io(ZZIP_FILE * stream,
874 zzip_char_t * name, int o_flags,
875 int o_modes, zzip_strings_t * ext,
876 zzip_plugin_io_t io);
877 ZZIP_FILE *zzip_open_ext_io(zzip_char_t * name, int o_flags,
878 int o_modes, zzip_strings_t * ext,
879 zzip_plugin_io_t io);
880 ZZIP_DIR *zzip_opendir_ext_io(zzip_char_t * name, int o_modes,
881 zzip_strings_t * ext, zzip_plugin_io_t io);
883 /* DLL compatibility layer - so that 32bit code can link with this lib too */
886 zzip_open_shared_io(ZZIP_FILE * stream,
887 zzip_char_t * name, int o_flags,
888 int o_modes, zzip_strings_t * ext, zzip_plugin_io_t io)
891 return zzip_open_shared_io64(stream, name, o_flags, o_modes, ext, io);
897 zzip_open_ext_io(zzip_char_t * name, int o_flags, int o_modes,
898 zzip_strings_t * ext, zzip_plugin_io_t io)
901 return zzip_open_ext_io64(name, o_flags, o_modes, ext, io);
907 zzip_opendir_ext_io(zzip_char_t * name, int o_modes,
908 zzip_strings_t * ext, zzip_plugin_io_t io)
911 return zzip_opendir_ext_io64(name, o_modes, ext, io);
913 { errno = EOVERFLOW; return NULL; }
916 #endif /* ZZIP_LARGEFILE_RENAME && EOVERFLOW && PIC */
918 /* ------------------------------------------------------------------- */
921 * This function will rewind a real/zipped file.
923 * It seeks to the beginning of this file's data in the zip,
924 * or the beginning of the file for a stat'fd.
927 zzip_rewind(ZZIP_FILE * fp)
937 fp->io->fd.seeks(fp->fd, 0, SEEK_SET);
943 * If this is other handle than previous, save current seek pointer
945 if (dir->currentfp != fp)
947 if (zzip_file_saveoffset(dir->currentfp) < 0)
948 { dir->errcode = ZZIP_DIR_SEEK; return -1; }
950 { dir->currentfp = fp; }
953 /* seek to beginning of this file */
954 if (fp->io->fd.seeks(dir->fd, fp->dataoffset, SEEK_SET) < 0)
957 /* reset the inflate init stuff */
958 fp->restlen = fp->usize;
959 fp->offset = fp->dataoffset;
962 { /* method == 8, deflate */
963 err = inflateReset(&fp->d_stream);
967 /* start over at next inflate with a fresh read() */
968 fp->d_stream.avail_in = 0;
969 fp->crestlen = fp->csize;
981 * This function will perform a => lseek(2) operation on a real/zipped file
983 * It will try to seek to the offset specified by offset, relative to whence,
984 * which is one of SEEK_SET, SEEK_CUR or SEEK_END.
986 * If the file-handle is wrapping a stat'able file then it will actually just
987 * perform a normal => lseek(2)-call. Otherwise the relative offset
988 * is calculated, negative offsets are transformed into positive ones
989 * by rewinding the file, and then data is read until the offset is
990 * reached. This can make the function terribly slow, but this is
991 * how gzio implements it, so I'm not sure there is a better way
992 * without using the internals of the algorithm.
995 zzip_seek(ZZIP_FILE * fp, zzip_off_t offset, int whence)
997 zzip_off_t cur_pos, rel_ofs, read_size, ofs;
1005 return fp->io->fd.seeks(fp->fd, offset, whence);
1008 cur_pos = zzip_tell(fp);
1010 /* calculate relative offset */
1013 case SEEK_SET: /* from beginning */
1014 rel_ofs = offset - cur_pos;
1016 case SEEK_CUR: /* from current */
1019 case SEEK_END: /* from end */
1020 rel_ofs = fp->usize + offset - cur_pos;
1022 default: /* something wrong */
1027 return cur_pos; /* don't have to move */
1030 { /* convert backward into forward */
1031 if (zzip_rewind(fp) == -1)
1034 read_size = cur_pos + rel_ofs;
1037 { /* amount to read is positive relative offset */
1038 read_size = rel_ofs;
1041 if (read_size < 0) /* bad offset, before beginning of file */
1044 if (read_size + cur_pos > (zzip_off_t) fp->usize) /* bad offset, past EOF */
1047 if (read_size == 0) /* nothing to read */
1052 * If this is other handle than previous, save current seek pointer
1053 * and read the file position of `this' handle.
1055 if (dir->currentfp != fp)
1057 if (zzip_file_saveoffset(dir->currentfp) < 0
1058 || fp->io->fd.seeks(dir->fd, fp->offset, SEEK_SET) < 0)
1059 { dir->errcode = ZZIP_DIR_SEEK; return -1; }
1061 { dir->currentfp = fp; }
1064 if (fp->method == 0)
1065 { /* unstore, just lseek relatively */
1066 ofs = fp->io->fd.tells(dir->fd);
1067 ofs = fp->io->fd.seeks(dir->fd, read_size, SEEK_CUR);
1069 { /* readjust from beginning of file */
1070 ofs -= fp->dataoffset;
1071 fp->restlen = fp->usize - ofs;
1075 { /* method == 8, inflate */
1078 /*FIXME: use a static buffer! */
1079 buf = (char *) malloc(ZZIP_32K);
1083 while (read_size > 0)
1085 zzip_off_t size = ZZIP_32K;
1087 if (read_size < size /*32K */ )
1090 size = zzip_file_read(fp, buf, (zzip_size_t) size);
1092 { free(buf); return -1; }
1100 return zzip_tell(fp);
1104 * This function will => tell(2) the current position in a real/zipped file
1106 * It will return the current offset within the real/zipped file,
1107 * measured in uncompressed bytes for the zipped-file case.
1109 * If the file-handle is wrapping a stat'able file then it will actually just
1110 * perform a normal => tell(2)-call, otherwise the offset is
1111 * calculated from the amount of data left and the total uncompressed
1115 zzip_tell(ZZIP_FILE * fp)
1120 if (! fp->dir) /* stat fd */
1121 return fp->io->fd.tells(fp->fd);
1123 /* current uncompressed offset is uncompressed size - data left */
1124 return (fp->usize - fp->restlen);
1129 * c-file-style: "stroustrup"