4 * Guido Draheim <guidod@gmx.de>
5 * Tomi Ollila <Tomi.Ollila@iki.fi>
7 * Copyright (c) Guido Draheim, use under copyleft (LGPL,MPL)
10 #include <zzip/lib.h> /* exported... */
11 #include <zzip/file.h>
19 #include <zzip/format.h>
20 #include <zzip/fetch.h>
21 #include <zzip/__debug.h>
24 # if defined ZZIP_HAVE_IO_H
25 # include <io.h> /* tell */
27 # define tell(fd) lseek(fd,0,SEEK_CUR)
30 #define tells(fd) seeks(fd,0,SEEK_CUR)
34 * the direct function of => zzip_close(fp). it will cleanup the
35 * inflate-portion of => zlib and free the structure given.
37 * it is called quite from the error-cleanup parts
38 * of the various => _open functions.
40 * the .refcount is decreased and if zero the fp->dir is closed just as well.
43 zzip_file_close(ZZIP_FILE * fp)
46 ZZIP_DIR *dir = fp->dir;
49 inflateEnd(&fp->d_stream); /* inflateEnd() can be called many times */
51 if (dir->cache.locked == NULL)
52 dir->cache.locked = &self;
56 if (dir->cache.locked == &self && dir->cache.buf32k == NULL)
57 dir->cache.buf32k = fp->buf32k;
62 if (dir->currentfp == fp)
63 dir->currentfp = NULL;
66 /* ease to notice possible dangling reference errors */
67 memset(fp, 0, sizeof(*fp));
69 if (dir->cache.locked == &self && dir->cache.fp == NULL)
74 if (dir->cache.locked == &self)
75 dir->cache.locked = NULL;
78 return zzip_dir_close(dir);
85 zzip_file_saveoffset(ZZIP_FILE * fp)
90 zzip_off_t off = fp->io->fd.seeks(fd, 0, SEEK_CUR);
101 /* user-definition */
102 #ifndef ZZIP_BACKSLASH_DIRSEP
103 #if defined HAVE_WINDOWS_H || defined ZZIP_HAVE_WINDOWS_H || defined _WIN32
104 #define ZZIP_BACKSLASH_DIRSEP 1
105 #elif defined ZZIP_CHECK_BACKSLASH_DIRSEPARATOR
106 #define ZZIP_BACKSLASH_DIRSEP 1
108 #define ZZIP_BACKSLASH_DIRSEP 0
113 strrchr_basename(zzip_char_t* name)
115 register zzip_char_t *n = strrchr(name, '/');
121 dirsep_basename(zzip_char_t* name)
123 register zzip_char_t *n = strrchr(name, '/');
125 if (ZZIP_BACKSLASH_DIRSEP)
127 register zzip_char_t *m = strrchr(name, '\\');
128 if (!n || (m && n < m))
136 #if defined strcasecmp
137 #define dirsep_strcasecmp strcasecmp
140 dirsep_strcasecmp(zzip_char_t * s1, zzip_char_t * s2)
142 /* ASCII tolower - including mapping of backslash in normal slash */
143 static const char mapping[] = "@abcdefghijklmnopqrstuvwxyz[/]^_";
148 c1 = (int) (unsigned char) *s1;
149 c2 = (int) (unsigned char) *s2;
150 if ((c1 & 0xE0) == 0x40)
151 c1 = mapping[c1 & 0x1f];
152 if ((c2 & 0xE0) == 0x40)
153 c2 = mapping[c2 & 0x1f];
160 return (((int) (unsigned char) *s1) - ((int) (unsigned char) *s2));
164 static int zzip_inflate_init(ZZIP_FILE *, struct zzip_dir_hdr *);
167 * open an => ZZIP_FILE from an already open => ZZIP_DIR handle. Since
168 * we have a chance to reuse a cached => buf32k and => ZZIP_FILE memchunk
169 * this is the best choice to unpack multiple files.
171 * Note: the zlib supports 2..15 bit windowsize, hence we provide a 32k
172 * memchunk here... just to be safe.
174 * On error it returns null and sets errcode in the ZZIP_DIR.
177 zzip_file_open(ZZIP_DIR * dir, zzip_char_t * name, int o_mode)
180 zzip_error_t err = 0;
181 struct zzip_file *fp = 0;
182 struct zzip_dir_hdr *hdr = dir->hdr0;
183 int (*filename_strcmp) (zzip_char_t *, zzip_char_t *);
184 zzip_char_t* (*filename_basename)(zzip_char_t*);
186 filename_strcmp = (o_mode & ZZIP_CASELESS) ? dirsep_strcasecmp : strcmp;
187 filename_basename = (o_mode & ZZIP_CASELESS) ? dirsep_basename : strrchr_basename;
191 if (! dir->fd || dir->fd == -1)
192 { dir->errcode = EBADF; return NULL; }
194 { dir->errcode = ENOENT; return NULL; }
196 if (o_mode & ZZIP_NOPATHS)
197 name = filename_basename(name);
201 register zzip_char_t *hdr_name = hdr->d_name;
203 if (o_mode & ZZIP_NOPATHS)
204 hdr_name = filename_basename(hdr_name);
206 HINT4("name='%s', compr=%d, size=%d\n",
207 hdr->d_name, hdr->d_compr, hdr->d_usize);
209 if (! filename_strcmp(hdr_name, name))
211 switch (hdr->d_compr)
214 case 8: /* inflate */
217 { err = ZZIP_UNSUPP_COMPR; goto error; }
220 if (dir->cache.locked == NULL)
221 dir->cache.locked = &self;
223 if (dir->cache.locked == &self && dir->cache.fp)
226 dir->cache.fp = NULL;
227 /* memset(zfp, 0, sizeof *fp); cleared in zzip_file_close() */
230 if (! (fp = (ZZIP_FILE *) calloc(1, sizeof(*fp))))
231 { err = ZZIP_OUTOFMEM; goto error; }
238 if (dir->cache.locked == &self && dir->cache.buf32k)
240 fp->buf32k = dir->cache.buf32k;
241 dir->cache.buf32k = NULL;
244 if (! (fp->buf32k = (char *) malloc(ZZIP_32K)))
245 { err = ZZIP_OUTOFMEM; goto error; }
248 if (dir->cache.locked == &self)
249 dir->cache.locked = NULL;
251 * In order to support simultaneous open files in one zip archive
252 * we'll fix the fd offset when opening new file/changing which
256 if (zzip_file_saveoffset(dir->currentfp) < 0)
257 { err = ZZIP_DIR_SEEK; goto error; }
259 fp->offset = hdr->d_off;
262 if (dir->io->fd.seeks(dir->fd, hdr->d_off, SEEK_SET) < 0)
263 { err = ZZIP_DIR_SEEK; goto error; }
266 /* skip local header - should test tons of other info,
267 * but trust that those are correct */
268 zzip_ssize_t dataoff;
269 struct zzip_file_header *p = (void *) fp->buf32k;
271 dataoff = dir->io->fd.read(dir->fd, (void *) p, sizeof(*p));
272 if (dataoff < (zzip_ssize_t) sizeof(*p))
273 { err = ZZIP_DIR_READ; goto error; }
274 if (! zzip_file_header_check_magic(p)) /* PK\3\4 */
275 { err = ZZIP_CORRUPTED; goto error; }
277 dataoff = zzip_file_header_sizeof_tail(p);
279 if (dir->io->fd.seeks(dir->fd, dataoff, SEEK_CUR) < 0)
280 { err = ZZIP_DIR_SEEK; goto error; }
282 fp->dataoffset = dir->io->fd.tells(dir->fd);
283 fp->usize = hdr->d_usize;
284 fp->csize = hdr->d_csize;
287 err = zzip_inflate_init(fp, hdr);
294 if (hdr->d_reclen == 0)
296 hdr = (struct zzip_dir_hdr *) ((char *) hdr + hdr->d_reclen);
297 } /*filename_strcmp */
299 dir->errcode = ZZIP_ENOENT;
309 * call => inflateInit and setup fp's iterator variables,
310 * used by lowlevel => _open functions.
313 zzip_inflate_init(ZZIP_FILE * fp, struct zzip_dir_hdr *hdr)
317 fp->method = hdr->d_compr;
318 fp->restlen = hdr->d_usize;
322 memset(&fp->d_stream, 0, sizeof(fp->d_stream));
324 err = inflateInit2(&fp->d_stream, -MAX_WBITS);
328 fp->crestlen = hdr->d_csize;
338 * This function closes the given ZZIP_FILE handle.
340 * If the ZZIP_FILE wraps a normal stat'fd then it is just that int'fd
341 * that is being closed and the otherwise empty ZZIP_FILE gets freed.
344 zzip_fclose(ZZIP_FILE * fp)
348 if (! fp->dir) /* stat fd */
349 { int r = fp->io->fd.close(fp->fd); free(fp); return r; }
351 return zzip_file_close(fp);
357 zzip_close(ZZIP_FILE * fp)
359 return zzip_fclose(fp);
363 * This functions read data from zip-contained file.
365 * It works like => read(2) and will fill the given buffer with bytes from
366 * the opened file. It will return the number of bytes read, so if the => EOF
367 * is encountered you will be prompted with the number of bytes actually read.
369 * This is the routines that needs the => buf32k buffer, and it would have
370 * need for much more polishing but it does already work quite well.
372 * Note: the 32K buffer is rather big. The original inflate-algorithm
373 * required just that but the latest zlib would work just fine with
377 zzip_file_read(ZZIP_FILE * fp, void *buf, zzip_size_t len)
383 if (! fp || ! fp->dir)
387 l = fp->restlen > len ? len : fp->restlen;
388 if (fp->restlen == 0)
392 * If this is other handle than previous, save current seek pointer
393 * and read the file position of `this' handle.
395 if (dir->currentfp != fp)
397 if (zzip_file_saveoffset(dir->currentfp) < 0
398 || fp->io->fd.seeks(dir->fd, fp->offset, SEEK_SET) < 0)
399 { dir->errcode = ZZIP_DIR_SEEK; return -1; }
401 { dir->currentfp = fp; }
404 /* if more methods is to be supported, change this to `switch ()' */
405 if (fp->method) /* method != 0 == 8, inflate */
407 fp->d_stream.avail_out = l;
408 fp->d_stream.next_out = (unsigned char *) buf;
413 zzip_size_t startlen;
415 if (fp->crestlen > 0 && fp->d_stream.avail_in == 0)
417 zzip_size_t cl = (fp->crestlen < ZZIP_32K ?
418 fp->crestlen : ZZIP_32K);
420 * fp->crestlen > 128 ? 128 : fp->crestlen;
422 zzip_ssize_t i = fp->io->fd.read(dir->fd, fp->buf32k, cl);
426 dir->errcode = ZZIP_DIR_READ;
427 /* or ZZIP_DIR_READ_EOF ? */
431 fp->d_stream.avail_in = i;
432 fp->d_stream.next_in = (unsigned char *) fp->buf32k;
435 startlen = fp->d_stream.total_out;
436 err = inflate(&fp->d_stream, Z_NO_FLUSH);
438 if (err == Z_STREAM_END)
440 else if (err == Z_OK)
441 { fp->restlen -= (fp->d_stream.total_out - startlen); }
443 { dir->errcode = err; return -1; }
445 while (fp->restlen && fp->d_stream.avail_out);
447 return l - fp->d_stream.avail_out;
449 { /* method == 0 -- unstore */
450 rv = fp->io->fd.read(dir->fd, buf, l);
452 { fp->restlen-= rv; }
454 { dir->errcode = ZZIP_DIR_READ; }
460 * This function will read(2) data from a real/zipped file.
462 * the replacement for => read(2) will fill the given buffer with bytes from
463 * the opened file. It will return the number of bytes read, so if the EOF
464 * is encountered you will be prompted with the number of bytes actually read.
466 * If the file-handle is wrapping a stat'able file then it will actually just
467 * perform a normal => read(2)-call, otherwise => zzip_file_read is called
468 * to decompress the data stream and any error is mapped to => errno(3).
471 zzip_read(ZZIP_FILE * fp, void *buf, zzip_size_t len)
476 { return fp->io->fd.read(fp->fd, buf, len); } /* stat fd */
479 register zzip_ssize_t v;
481 v = zzip_file_read(fp, buf, len);
483 { errno = zzip_errno(fp->dir->errcode); }
491 zzip_fread(void *ptr, zzip_size_t size, zzip_size_t nmemb, ZZIP_FILE * file)
495 return zzip_read(file, ptr, size * nmemb) / size;
499 #define ZZIP_WRONLY O_WRONLY
500 #define ZZIP_EXCL O_EXCL
503 #define ZZIP_SYNC O_SYNC
508 #if defined O_NONBLOCK
509 #define ZZIP_NONBLOCK O_NONBLOCK
510 #elif defined O_NDELAY
511 #define ZZIP_NOCTTY O_NDELAY
513 #define ZZIP_NOCTTY 0
516 /* ------------------------------------------------------------------- */
519 * This function will => fopen(3) a real/zipped file.
521 * It has some magic functionality builtin - it will first try to open
522 * the given <em>filename</em> as a normal file. If it does not
523 * exist, the given path to the filename (if any) is split into
524 * its directory-part and the file-part. A ".zip" extension is
525 * then added to the directory-part to create the name of a
526 * zip-archive. That zip-archive (if it exists) is being searched
527 * for the file-part, and if found a zzip-handle is returned.
529 * Note that if the file is found in the normal fs-directory the
530 * returned structure is mostly empty and the => zzip_read call will
531 * use the libc => read(2) to obtain data. Otherwise a => zzip_file_open
532 * is performed and any error mapped to => errno(3).
534 * unlike the posix-wrapper => zzip_open the mode-argument is
535 * a string which allows for more freedom to support the extra
536 * zzip modes called ZZIP_CASEINSENSITIVE and ZZIP_IGNOREPATH.
537 * Currently, this => zzip_fopen call will convert the following
538 * characters in the mode-string into their corrsponding mode-bits:
539 * * <code> "r" : O_RDONLY : </code> read-only
540 * * <code> "b" : O_BINARY : </code> binary (win32 specific)
541 * * <code> "f" : O_NOCTTY : </code> no char device (unix)
542 * * <code> "i" : ZZIP_CASELESS : </code> inside zip file
543 * * <code> "*" : ZZIP_NOPATHS : </code> inside zip file only
544 * all other modes will be ignored for zip-contained entries
545 * but they are transferred for compatibility and portability,
546 * including these extra sugar bits:
547 * * <code> "x" : O_EXCL :</code> fail if file did exist
548 * * <code> "s" : O_SYNC :</code> synchronized access
549 * * <code> "n" : O_NONBLOCK :</code> nonblocking access
550 * * <code> "z#" : compression level :</code> for zlib
551 * * <code> "g#" : group access :</code> unix access bits
552 * * <code> "u#" : owner access :</code> unix access bits
553 * * <code> "o#" : world access :</code> unix access bits
554 * ... the access bits are in traditional unix bit format
555 * with 7 = read/write/execute, 6 = read/write, 4 = read-only.
557 * The default access mode is 0664, and the compression level
558 * is ignored since the lib can not yet write zip files, otherwise
559 * it would be the initialisation value for the zlib deflateInit
560 * where 0 = no-compression, 1 = best-speed, 9 = best-compression.
562 * This function returns a new zzip-handle (use => zzip_close to return
563 * it). On error this function will return null setting => errno(3).
566 zzip_fopen(zzip_char_t * filename, zzip_char_t * mode)
568 return zzip_freopen(filename, mode, 0);
573 * This function receives an additional argument pointing to
574 * a ZZIP_FILE* being already in use. If this extra argument is
575 * null then this function is identical with calling => zzip_fopen
577 * Per default, the old file stream is closed and only the internal
578 * structures associated with it are kept. These internal structures
579 * may be reused for the return value, and this is a lot quicker when
580 * the filename matches a zipped file that is incidently in the very
581 * same zip arch as the old filename wrapped in the stream struct.
583 * That's simply because the zip arch's central directory does not
584 * need to be read again. As an extension for this function, if the
585 * mode-string contains a "q" then the old stream is not closed but
586 * left untouched, instead it is only given as a hint that a new
587 * file handle may share/copy the zip arch structures of the old file
588 * handle if that is possible, i.e when they are in the same zip arch.
590 * This function returns a new zzip-handle (use => zzip_close to return
591 * it). On error this function will return null setting => errno(3).
594 zzip_freopen(zzip_char_t * filename, zzip_char_t * mode, ZZIP_FILE * stream)
612 # define O_NONBLOCK 0
615 for (; *mode; mode++)
620 case '0': case '1': case '2': case '3': case '4':
621 case '5': case '6': case '7': case '8': case '9':
622 continue; /* ignore if not attached to other info */
623 case 'r': o_flags |= mode[1] == '+' ? O_RDWR : O_RDONLY; break;
624 case 'w': o_flags |= mode[1] == '+' ? O_RDWR : O_WRONLY;
625 o_flags |= O_TRUNC; break;
626 case 'b': o_flags |= O_BINARY; break;
627 case 'f': o_flags |= O_NOCTTY; break;
628 case 'i': o_modes |= ZZIP_CASELESS; break;
629 case '*': o_modes |= ZZIP_NOPATHS; break;
630 case 'x': o_flags |= O_EXCL; break;
631 case 's': o_flags |= O_SYNC; break;
632 case 'n': o_flags |= O_NONBLOCK; break;
633 case 'o': o_modes &=~ 07;
634 o_modes |= ((mode[1] - '0')) & 07; continue;
635 case 'g': o_modes &=~ 070;
636 o_modes |= ((mode[1] - '0') << 3) & 070; continue;
637 case 'u': o_modes &=~ 0700;
638 o_modes |= ((mode[1] - '0') << 6) & 0700; continue;
639 case 'q': o_modes |= ZZIP_FACTORY; break;
640 case 'z': /* compression level */
641 continue; /* currently ignored, just for write mode */
648 zzip_open_shared_io(stream, filename, o_flags, o_modes, 0, 0);
650 if (! (o_modes & ZZIP_FACTORY) && stream)
651 zzip_file_close(stream);
658 * This function will => open(2) a real/zipped file
660 * It has some magic functionality builtin - it will first try to open
661 * the given <em>filename</em> as a normal file. If it does not
662 * exist, the given path to the filename (if any) is split into
663 * its directory-part and the file-part. A ".zip" extension is
664 * then added to the directory-part to create the name of a
665 * zip-archive. That zip-archive (if it exists) is being searched
666 * for the file-part, and if found a zzip-handle is returned.
668 * Note that if the file is found in the normal fs-directory the
669 * returned structure is mostly empty and the => zzip_read call will
670 * use the libc => read(2) to obtain data. Otherwise a => zzip_file_open
671 * is performed and any error mapped to => errno(3).
673 * There was a possibility to transfer zziplib-specific openmodes
674 * through o_flags but you should please not use them anymore and
675 * look into => zzip_open_ext_io to submit them down. This function
676 * is shallow in that it just extracts the zzipflags and calls
677 * * <code>zzip_open_ext_io(filename, o_flags, zzipflags|0664, 0, 0) </code>
678 * you must stop using this extra functionality (not well known anyway)
679 * since zzip_open might be later usable to open files for writing
680 * in which case the _EXTRAFLAGS will get in conflict.
682 * compare with => open(2) and => zzip_fopen
685 zzip_open(zzip_char_t * filename, int o_flags)
687 /* backward compatibility */
690 if (o_flags & ZZIP_CASEINSENSITIVE)
691 { o_flags ^= ZZIP_CASEINSENSITIVE; o_modes |= ZZIP_CASELESS; }
692 if (o_flags & ZZIP_IGNOREPATH)
693 { o_flags ^= ZZIP_IGNOREPATH; o_modes |= ZZIP_NOPATHS; }
694 return zzip_open_ext_io(filename, o_flags, o_modes, 0, 0);
697 /* ZZIP_ONLYZIP won't work on platforms with sizeof(int) == 16bit */
698 #if ZZIP_SIZEOF_INT+0 == 2
704 * This function uses explicit ext and io instead of the internal
705 * defaults, setting them to zero is equivalent to => zzip_open
707 * note that the two flag types have been split into an o_flags
708 * (for fcntl-like openflags) and o_modes where the latter shall
709 * carry the zzip_flags and possibly accessmodes for unix filesystems.
710 * Since this version of zziplib can not write zipfiles, it is not
711 * yet used for anything else than zzip-specific modeflags.
713 * This function returns a new zzip-handle (use => zzip_close to return
714 * it). On error this function will return null setting => errno(3).
716 * If any ext_io handlers were used then the referenced structure
717 * should be static as the allocated ZZIP_FILE does not copy them.
720 zzip_open_ext_io(zzip_char_t * filename, int o_flags, int o_modes,
721 zzip_strings_t * ext, zzip_plugin_io_t io)
723 return zzip_open_shared_io(0, filename, o_flags, o_modes, ext, io);
728 * This function takes an extra stream argument - if a handle has been
729 * then ext/io can be left null and the new stream handle will pick up
730 * the ext/io. This should be used only in specific environment however
731 * since => zzip_file_real does not store any ext-sequence.
733 * The benefit for this function comes in when the old file handle
734 * was openened from a file within a zip archive. When the new file
735 * is in the same zip archive then the internal zzip_dir structures
736 * will be shared. It is even quicker, as no check needs to be done
737 * anymore trying to guess the zip archive place in the filesystem,
738 * here we just check whether the zip archive's filepath is a prefix
739 * part of the filename to be opened.
741 * Note that this function is also used by => zzip_freopen that
742 * will unshare the old handle, thereby possibly closing the handle.
744 * This function returns a new zzip-handle (use => zzip_close to return
745 * it). On error this function will return null setting => errno(3).
748 zzip_open_shared_io(ZZIP_FILE * stream,
749 zzip_char_t * filename, int o_flags, int o_modes,
750 zzip_strings_t * ext, zzip_plugin_io_t io)
752 if (stream && stream->dir)
755 ext = stream->dir->fileext;
757 io = stream->dir->io;
760 io = zzip_get_default_io();
762 if (o_modes & (ZZIP_PREFERZIP | ZZIP_ONLYZIP))
765 /* prefer an existing real file */
767 zzip_plugin_io_t os = (o_modes & ZZIP_ALLOWREAL)
768 ? zzip_get_default_io() : io;
769 int fd = (os->fd.open)(filename, o_flags); /* io->fd.open */
773 ZZIP_FILE *fp = calloc(1, sizeof(ZZIP_FILE));
776 { os->fd.close(fd); return 0; } /* io->fd.close */
782 if (o_modes & ZZIP_PREFERZIP)
787 /* if the user had it in place of a normal xopen, then
788 * we better defend this lib against illegal usage */
789 if (o_flags & (O_CREAT | O_WRONLY))
790 { errno = EINVAL; return 0; }
791 if (o_flags & (O_RDWR))
792 { o_flags ^= O_RDWR; o_flags |= O_RDONLY; }
794 /* this is just for backward compatibility -and strictly needed to
795 * prepare ourselves for more options and more options later on... */
796 /*# if (o_modes & ZZIP_CASELESS) { o_flags |= ZZIP_CASEINSENSITIVE; } */
797 /*# if (o_modes & ZZIP_NOPATHS) { o_flags |= ZZIP_IGNOREPATH; } */
799 /* see if we can open a file that is a zip file */
801 char basename[PATH_MAX];
803 int filename_len = strlen(filename);
805 if (filename_len >= PATH_MAX)
806 { errno = ENAMETOOLONG; return 0; }
807 memcpy(basename, filename, filename_len + 1);
809 /* see if we can share the same zip directory */
810 if (stream && stream->dir && stream->dir->realname)
812 zzip_size_t len = strlen(stream->dir->realname);
814 if (! memcmp(filename, stream->dir->realname, len) &&
815 filename[len] == '/' && filename[len + 1])
818 zzip_file_open(stream->dir, filename + len + 1, o_modes);
820 { errno = zzip_errno (stream->dir->errcode); }
825 /* per each slash in filename, check if it there is a zzip around */
826 while ((p = strrchr(basename, '/')))
834 /* i.e. cut at path separator == possible zipfile basename */
835 fd = __zzip_try_open(basename, o_flags | O_RDONLY | O_BINARY,
840 /* found zip-file .... now try to parse it */
841 dir = zzip_dir_fdopen_ext_io(fd, &e, ext, io);
843 { errno = zzip_errno(e); io->fd.close(fd); return 0; }
845 /* (p - basename) is the lenghtof zzip_dir part of the filename */
846 fp = zzip_file_open(dir, filename + (p - basename) + 1, o_modes);
848 { errno = zzip_errno(dir->errcode); }
850 { if (! dir->realname) dir->realname = strdup (basename); }
853 /* note: since (fp) is attached that (dir) will survive */
854 /* but (dir) is implicitly closed on next zzip_close(fp) */
859 if (o_modes & ZZIP_PREFERZIP)
862 { errno = ENOENT; return 0; }
866 #if defined ZZIP_LARGEFILE_RENAME && defined EOVERFLOW && defined PIC
867 #undef zzip_open_shared_io /* zzip_open_shared_io64 */
868 #undef zzip_open_ext_io /* zzip_open_ext_io64 */
869 #undef zzip_opendir_ext_io /* zzip_opendir_ext_io64 */
871 ZZIP_FILE *zzip_open_shared_io(ZZIP_FILE * stream,
872 zzip_char_t * name, int o_flags,
873 int o_modes, zzip_strings_t * ext,
874 zzip_plugin_io_t io);
875 ZZIP_FILE *zzip_open_ext_io(zzip_char_t * name, int o_flags,
876 int o_modes, zzip_strings_t * ext,
877 zzip_plugin_io_t io);
878 ZZIP_DIR *zzip_opendir_ext_io(zzip_char_t * name, int o_modes,
879 zzip_strings_t * ext, zzip_plugin_io_t io);
881 /* DLL compatibility layer - so that 32bit code can link with this lib too */
884 zzip_open_shared_io(ZZIP_FILE * stream,
885 zzip_char_t * name, int o_flags,
886 int o_modes, zzip_strings_t * ext, zzip_plugin_io_t io)
889 return zzip_open_shared_io64(stream, name, o_flags, o_modes, ext, io);
895 zzip_open_ext_io(zzip_char_t * name, int o_flags, int o_modes,
896 zzip_strings_t * ext, zzip_plugin_io_t io)
899 return zzip_open_ext_io64(name, o_flags, o_modes, ext, io);
905 zzip_opendir_ext_io(zzip_char_t * name, int o_modes,
906 zzip_strings_t * ext, zzip_plugin_io_t io)
909 return zzip_opendir_ext_io64(name, o_modes, ext, io);
911 { errno = EOVERFLOW; return NULL; }
914 #endif /* ZZIP_LARGEFILE_RENAME && EOVERFLOW && PIC */
916 /* ------------------------------------------------------------------- */
919 * This function will rewind a real/zipped file.
921 * It seeks to the beginning of this file's data in the zip,
922 * or the beginning of the file for a stat'fd.
925 zzip_rewind(ZZIP_FILE * fp)
935 fp->io->fd.seeks(fp->fd, 0, SEEK_SET);
941 * If this is other handle than previous, save current seek pointer
943 if (dir->currentfp != fp)
945 if (zzip_file_saveoffset(dir->currentfp) < 0)
946 { dir->errcode = ZZIP_DIR_SEEK; return -1; }
948 { dir->currentfp = fp; }
951 /* seek to beginning of this file */
952 if (fp->io->fd.seeks(dir->fd, fp->dataoffset, SEEK_SET) < 0)
955 /* reset the inflate init stuff */
956 fp->restlen = fp->usize;
957 fp->offset = fp->dataoffset;
960 { /* method == 8, deflate */
961 err = inflateReset(&fp->d_stream);
965 /* start over at next inflate with a fresh read() */
966 fp->d_stream.avail_in = 0;
967 fp->crestlen = fp->csize;
979 * This function will perform a => lseek(2) operation on a real/zipped file
981 * It will try to seek to the offset specified by offset, relative to whence,
982 * which is one of SEEK_SET, SEEK_CUR or SEEK_END.
984 * If the file-handle is wrapping a stat'able file then it will actually just
985 * perform a normal => lseek(2)-call. Otherwise the relative offset
986 * is calculated, negative offsets are transformed into positive ones
987 * by rewinding the file, and then data is read until the offset is
988 * reached. This can make the function terribly slow, but this is
989 * how gzio implements it, so I'm not sure there is a better way
990 * without using the internals of the algorithm.
993 zzip_seek(ZZIP_FILE * fp, zzip_off_t offset, int whence)
995 zzip_off_t cur_pos, rel_ofs, read_size, ofs;
1003 return fp->io->fd.seeks(fp->fd, offset, whence);
1006 cur_pos = zzip_tell(fp);
1008 /* calculate relative offset */
1011 case SEEK_SET: /* from beginning */
1012 rel_ofs = offset - cur_pos;
1014 case SEEK_CUR: /* from current */
1017 case SEEK_END: /* from end */
1018 rel_ofs = fp->usize + offset - cur_pos;
1020 default: /* something wrong */
1025 return cur_pos; /* don't have to move */
1028 { /* convert backward into forward */
1029 if (zzip_rewind(fp) == -1)
1032 read_size = cur_pos + rel_ofs;
1035 { /* amount to read is positive relative offset */
1036 read_size = rel_ofs;
1039 if (read_size < 0) /* bad offset, before beginning of file */
1042 if (read_size + cur_pos > (zzip_off_t) fp->usize) /* bad offset, past EOF */
1045 if (read_size == 0) /* nothing to read */
1050 * If this is other handle than previous, save current seek pointer
1051 * and read the file position of `this' handle.
1053 if (dir->currentfp != fp)
1055 if (zzip_file_saveoffset(dir->currentfp) < 0
1056 || fp->io->fd.seeks(dir->fd, fp->offset, SEEK_SET) < 0)
1057 { dir->errcode = ZZIP_DIR_SEEK; return -1; }
1059 { dir->currentfp = fp; }
1062 if (fp->method == 0)
1063 { /* unstore, just lseek relatively */
1064 ofs = fp->io->fd.tells(dir->fd);
1065 ofs = fp->io->fd.seeks(dir->fd, read_size, SEEK_CUR);
1067 { /* readjust from beginning of file */
1068 ofs -= fp->dataoffset;
1069 fp->restlen = fp->usize - ofs;
1073 { /* method == 8, inflate */
1076 /*FIXME: use a static buffer! */
1077 buf = (char *) malloc(ZZIP_32K);
1081 while (read_size > 0)
1083 zzip_off_t size = ZZIP_32K;
1085 if (read_size < size /*32K */ )
1088 size = zzip_file_read(fp, buf, (zzip_size_t) size);
1090 { free(buf); return -1; }
1098 return zzip_tell(fp);
1102 * This function will => tell(2) the current position in a real/zipped file
1104 * It will return the current offset within the real/zipped file,
1105 * measured in uncompressed bytes for the zipped-file case.
1107 * If the file-handle is wrapping a stat'able file then it will actually just
1108 * perform a normal => tell(2)-call, otherwise the offset is
1109 * calculated from the amount of data left and the total uncompressed
1113 zzip_tell(ZZIP_FILE * fp)
1118 if (! fp->dir) /* stat fd */
1119 return fp->io->fd.tells(fp->fd);
1121 /* current uncompressed offset is uncompressed size - data left */
1122 return (fp->usize - fp->restlen);
1126 #define EOVERFLOW EFBIG
1130 * This function is provided for users who can not use any largefile-mode.
1133 zzip_tell32(ZZIP_FILE * fp)
1135 if (sizeof(zzip_off_t) == sizeof(long))
1137 return zzip_tell(fp);
1140 off_t off = zzip_tell(fp);
1142 register long off32 = off;
1143 if (off32 == off) return off32;
1151 * This function is provided for users who can not use any largefile-mode.
1154 zzip_seek32(ZZIP_FILE * fp, long offset, int whence)
1156 if (sizeof(zzip_off_t) == sizeof(long))
1158 return zzip_seek(fp, offset, whence);
1161 off_t off = zzip_seek(fp, offset, whence);
1163 register long off32 = off;
1164 if (off32 == off) return off32;
1173 * c-file-style: "stroustrup"