/* $Log: gzio.c,v $ Revision 1.1 2002/03/18 17:14:42 Administrator Moved. Updated to 1.1.4 Revision 1.5 2002/03/12 05:56:08 Official changes for 1.1.4 Update copyright notices to match zlib version 1.1.4 Revision 1.4 2002/02/05 19:35:00 Administrator Standardized chg log Revision 1.3 2002/01/30 16:07:42 forrest@mibsoftware.com rights=#1 Renamed some .h files Added some (z_off_t) casts. Revision 1.2 2002/01/29 04:18:10 forrest@mibsoftware.com rights=#1 Lidesc and space/tab clean up Revision 1.1 2002/01/28 17:28:16 forrest@mibsoftware.com rights=#1 Initial, Added librock_ISOLATED and librock_IMPL_LIDESC sections at the top. rights#1 Copyright (c) Forrest J Cavalier III d-b-a Mib Software rights#1 License text in librock_LIDESC_HC=12440211096131f5976d36be0cddca4cd9152e45 librock_ACQUIRED: 2001-10-23 ftp://ftp.uu.net/graphics/png/src/zlib-1.1.3.tar.gz http://www.gzip.org/zlib/ */ #ifndef librock_ISOLATED /**************************************************************/ #define librock_IMPLEMENT_gzio #include #include /**************************************************************/ #endif #ifdef librock_IMPL_LIDESC #ifndef librock_NOIMPL_LIDESC_gzio /**************************************************************/ #include /* librock_LIDESC_HC=d49ece91d0f3402f1ca405bc4ae7b2a989a56ab2 */ #include /* librock_LIDESC_HC=12440211096131f5976d36be0cddca4cd9152e45 */ char *librock_LIDESC_gzio[] = { "\n" __FILE__ librock_LIDESC_zlib "\n", "\n" __FILE__ librock_LIDESC_librock "\n", 0 }; /**************************************************************/ #endif #endif /* Copyright (C) 1995-1998 Jean-loup Gailly and Mark Adler This software is provided 'as-is', without any express or implied warranty. In no event will the authors be held liable for any damages arising from the use of this software. Permission is granted to anyone to use this software for any purpose, including commercial applications, and to alter it and redistribute it freely, subject to the following restrictions: 1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required. 2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software. 3. This notice may not be removed or altered from any source distribution. */ /* gzio.c -- IO on .gz files * Copyright (C) 1995-2002 Jean-loup Gailly. * For conditions of distribution and use, see copyright notice in zlib.h * * Compile this file with -DNO_DEFLATE to avoid the compression code. */ /* @(#) $Id: gzio.c,v 1.1 2002/03/18 17:14:42 Administrator Exp $ */ #include #include "zutil.h" struct internal_state {int dummy;}; /* for buggy compilers */ #ifndef Z_BUFSIZE # ifdef MAXSEG_64K # define Z_BUFSIZE 4096 /* minimize memory usage for 16-bit DOS */ # else # define Z_BUFSIZE 16384 # endif #endif #ifndef Z_PRINTF_BUFSIZE # define Z_PRINTF_BUFSIZE 4096 #endif #define ALLOC(size) malloc(size) #define TRYFREE(p) {if (p) free(p);} static int gz_magic[2] = {0x1f, 0x8b}; /* gzip magic header */ /* gzip flag byte */ #define ASCII_FLAG 0x01 /* bit 0 set: file probably ascii text */ #define HEAD_CRC 0x02 /* bit 1 set: header CRC present */ #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */ #define ORIG_NAME 0x08 /* bit 3 set: original file name present */ #define COMMENT 0x10 /* bit 4 set: file comment present */ #define RESERVED 0xE0 /* bits 5..7: reserved */ typedef struct gz_stream { z_stream stream; int z_err; /* error code for last stream operation */ int z_eof; /* set if end of input file */ FILE *file; /* .gz file */ Byte *inbuf; /* input buffer */ Byte *outbuf; /* output buffer */ uLong crc; /* crc32 of uncompressed data */ char *msg; /* error message */ char *path; /* path name for debugging only */ int transparent; /* 1 if input file is not a .gz file */ char mode; /* 'w' or 'r' */ long startpos; /* start of compressed data in file (header skipped) */ } gz_stream; local gzFile gz_open OF((const char *path, const char *mode, int fd)); local int do_flush OF((gzFile file, int flush)); local int get_byte OF((gz_stream *s)); local void check_header OF((gz_stream *s)); local int destroy OF((gz_stream *s)); local void putLong OF((FILE *file, uLong x)); local uLong getLong OF((gz_stream *s)); /* =========================================================================== Opens a gzip (.gz) file for reading or writing. The mode parameter is as in fopen ("rb" or "wb"). The file is given either by file descriptor or path name (if fd == -1). gz_open return NULL if the file could not be opened or if there was insufficient memory to allocate the (de)compression state; errno can be checked to distinguish the two cases (if errno is zero, the zlib error is Z_MEM_ERROR). */ local gzFile gz_open (path, mode, fd) const char *path; const char *mode; int fd; { int err; int level = Z_DEFAULT_COMPRESSION; /* compression level */ int strategy = Z_DEFAULT_STRATEGY; /* compression strategy */ char *p = (char*)mode; gz_stream *s; char fmode[80]; /* copy of mode, without the compression level */ char *m = fmode; if (!path || !mode) return Z_NULL; s = (gz_stream *)ALLOC(sizeof(gz_stream)); if (!s) return Z_NULL; s->stream.zalloc = (alloc_func)0; s->stream.zfree = (free_func)0; s->stream.opaque = (voidpf)0; s->stream.next_in = s->inbuf = Z_NULL; s->stream.next_out = s->outbuf = Z_NULL; s->stream.avail_in = s->stream.avail_out = 0; s->file = NULL; s->z_err = Z_OK; s->z_eof = 0; s->crc = crc32(0L, Z_NULL, 0); s->msg = NULL; s->transparent = 0; s->path = (char*)ALLOC(strlen(path)+1); if (s->path == NULL) { return destroy(s), (gzFile)Z_NULL; } strcpy(s->path, path); /* do this early for debugging */ s->mode = '\0'; do { if (*p == 'r') s->mode = 'r'; if (*p == 'w' || *p == 'a') s->mode = 'w'; if (*p >= '0' && *p <= '9') { level = *p - '0'; } else if (*p == 'f') { strategy = Z_FILTERED; } else if (*p == 'h') { strategy = Z_HUFFMAN_ONLY; } else { *m++ = *p; /* copy the mode */ } } while (*p++ && m != fmode + sizeof(fmode)); if (s->mode == '\0') return destroy(s), (gzFile)Z_NULL; if (s->mode == 'w') { #ifdef NO_DEFLATE err = Z_STREAM_ERROR; #else err = deflateInit2(&(s->stream), level, Z_DEFLATED, -MAX_WBITS, DEF_MEM_LEVEL, strategy); /* windowBits is passed < 0 to suppress zlib header */ s->stream.next_out = s->outbuf = (Byte*)ALLOC(Z_BUFSIZE); #endif if (err != Z_OK || s->outbuf == Z_NULL) { return destroy(s), (gzFile)Z_NULL; } } else { s->stream.next_in = s->inbuf = (Byte*)ALLOC(Z_BUFSIZE); err = inflateInit2(&(s->stream), -MAX_WBITS); /* windowBits is passed < 0 to tell that there is no zlib header. * Note that in this case inflate *requires* an extra "dummy" byte * after the compressed stream in order to complete decompression and * return Z_STREAM_END. Here the gzip CRC32 ensures that 4 bytes are * present after the compressed stream. */ if (err != Z_OK || s->inbuf == Z_NULL) { return destroy(s), (gzFile)Z_NULL; } } s->stream.avail_out = Z_BUFSIZE; errno = 0; s->file = fd < 0 ? F_OPEN(path, fmode) : (FILE*)fdopen(fd, fmode); if (s->file == NULL) { return destroy(s), (gzFile)Z_NULL; } if (s->mode == 'w') { /* Write a very simple .gz header: */ fprintf(s->file, "%c%c%c%c%c%c%c%c%c%c", gz_magic[0], gz_magic[1], Z_DEFLATED, 0 /*flags*/, 0,0,0,0 /*time*/, 0 /*xflags*/, OS_CODE); s->startpos = 10L; /* We use 10L instead of ftell(s->file) to because ftell causes an * fflush on some systems. This version of the library doesn't use * startpos anyway in write mode, so this initialization is not * necessary. */ } else { check_header(s); /* skip the .gz header */ s->startpos = (ftell(s->file) - s->stream.avail_in); } return (gzFile)s; } /* =========================================================================== Opens a gzip (.gz) file for reading or writing. */ gzFile ZEXPORT gzopen (path, mode) const char *path; const char *mode; { return gz_open (path, mode, -1); } /* =========================================================================== Associate a gzFile with the file descriptor fd. fd is not dup'ed here to mimic the behavio(u)r of fdopen. */ gzFile ZEXPORT gzdopen (fd, mode) int fd; const char *mode; { char name[20]; if (fd < 0) return (gzFile)Z_NULL; sprintf(name, "", fd); /* for debugging */ return gz_open (name, mode, fd); } /* =========================================================================== * Update the compression level and strategy */ int ZEXPORT gzsetparams (file, level, strategy) gzFile file; int level; int strategy; { gz_stream *s = (gz_stream*)file; if (s == NULL || s->mode != 'w') return Z_STREAM_ERROR; /* Make room to allow flushing */ if (s->stream.avail_out == 0) { s->stream.next_out = s->outbuf; if (fwrite(s->outbuf, 1, Z_BUFSIZE, s->file) != Z_BUFSIZE) { s->z_err = Z_ERRNO; } s->stream.avail_out = Z_BUFSIZE; } return deflateParams (&(s->stream), level, strategy); } /* =========================================================================== Read a byte from a gz_stream; update next_in and avail_in. Return EOF for end of file. IN assertion: the stream s has been sucessfully opened for reading. */ local int get_byte(s) gz_stream *s; { if (s->z_eof) return EOF; if (s->stream.avail_in == 0) { errno = 0; s->stream.avail_in = fread(s->inbuf, 1, Z_BUFSIZE, s->file); if (s->stream.avail_in == 0) { s->z_eof = 1; if (ferror(s->file)) s->z_err = Z_ERRNO; return EOF; } s->stream.next_in = s->inbuf; } s->stream.avail_in--; return *(s->stream.next_in)++; } /* =========================================================================== Check the gzip header of a gz_stream opened for reading. Set the stream mode to transparent if the gzip magic header is not present; set s->err to Z_DATA_ERROR if the magic header is present but the rest of the header is incorrect. IN assertion: the stream s has already been created sucessfully; s->stream.avail_in is zero for the first time, but may be non-zero for concatenated .gz files. */ local void check_header(s) gz_stream *s; { int method; /* method byte */ int flags; /* flags byte */ uInt len; int c; /* Check the gzip magic header */ for (len = 0; len < 2; len++) { c = get_byte(s); if (c != gz_magic[len]) { if (len != 0) s->stream.avail_in++, s->stream.next_in--; if (c != EOF) { s->stream.avail_in++, s->stream.next_in--; s->transparent = 1; } s->z_err = s->stream.avail_in != 0 ? Z_OK : Z_STREAM_END; return; } } method = get_byte(s); flags = get_byte(s); if (method != Z_DEFLATED || (flags & RESERVED) != 0) { s->z_err = Z_DATA_ERROR; return; } /* Discard time, xflags and OS code: */ for (len = 0; len < 6; len++) (void)get_byte(s); if ((flags & EXTRA_FIELD) != 0) { /* skip the extra field */ len = (uInt)get_byte(s); len += ((uInt)get_byte(s))<<8; /* len is garbage if EOF but the loop below will quit anyway */ while (len-- != 0 && get_byte(s) != EOF) ; } if ((flags & ORIG_NAME) != 0) { /* skip the original file name */ while ((c = get_byte(s)) != 0 && c != EOF) ; } if ((flags & COMMENT) != 0) { /* skip the .gz file comment */ while ((c = get_byte(s)) != 0 && c != EOF) ; } if ((flags & HEAD_CRC) != 0) { /* skip the header crc */ for (len = 0; len < 2; len++) (void)get_byte(s); } s->z_err = s->z_eof ? Z_DATA_ERROR : Z_OK; } /* =========================================================================== * Cleanup then free the given gz_stream. Return a zlib error code. Try freeing in the reverse order of allocations. */ local int destroy (s) gz_stream *s; { int err = Z_OK; if (!s) return Z_STREAM_ERROR; TRYFREE(s->msg); if (s->stream.state != NULL) { if (s->mode == 'w') { #ifdef NO_DEFLATE err = Z_STREAM_ERROR; #else err = deflateEnd(&(s->stream)); #endif } else if (s->mode == 'r') { err = inflateEnd(&(s->stream)); } } if (s->file != NULL && fclose(s->file)) { #ifdef ESPIPE if (errno != ESPIPE) /* fclose is broken for pipes in HP/UX */ #endif err = Z_ERRNO; } if (s->z_err < 0) err = s->z_err; TRYFREE(s->inbuf); TRYFREE(s->outbuf); TRYFREE(s->path); TRYFREE(s); return err; } /* =========================================================================== Reads the given number of uncompressed bytes from the compressed file. gzread returns the number of bytes actually read (0 for end of file). */ int ZEXPORT gzread (file, buf, len) gzFile file; voidp buf; unsigned len; { gz_stream *s = (gz_stream*)file; Bytef *start = (Bytef*)buf; /* starting point for crc computation */ Byte *next_out; /* == stream.next_out but not forced far (for MSDOS) */ if (s == NULL || s->mode != 'r') return Z_STREAM_ERROR; if (s->z_err == Z_DATA_ERROR || s->z_err == Z_ERRNO) return -1; if (s->z_err == Z_STREAM_END) return 0; /* EOF */ next_out = (Byte*)buf; s->stream.next_out = (Bytef*)buf; s->stream.avail_out = len; while (s->stream.avail_out != 0) { if (s->transparent) { /* Copy first the lookahead bytes: */ uInt n = s->stream.avail_in; if (n > s->stream.avail_out) n = s->stream.avail_out; if (n > 0) { zmemcpy(s->stream.next_out, s->stream.next_in, n); next_out += n; s->stream.next_out = next_out; s->stream.next_in += n; s->stream.avail_out -= n; s->stream.avail_in -= n; } if (s->stream.avail_out > 0) { s->stream.avail_out -= fread(next_out, 1, s->stream.avail_out, s->file); } len -= s->stream.avail_out; s->stream.total_in += (uLong)len; s->stream.total_out += (uLong)len; if (len == 0) s->z_eof = 1; return (int)len; } if (s->stream.avail_in == 0 && !s->z_eof) { errno = 0; s->stream.avail_in = fread(s->inbuf, 1, Z_BUFSIZE, s->file); if (s->stream.avail_in == 0) { s->z_eof = 1; if (ferror(s->file)) { s->z_err = Z_ERRNO; break; } } s->stream.next_in = s->inbuf; } s->z_err = inflate(&(s->stream), Z_NO_FLUSH); if (s->z_err == Z_STREAM_END) { /* Check CRC and original size */ s->crc = crc32(s->crc, start, (uInt)(s->stream.next_out - start)); start = s->stream.next_out; if (getLong(s) != s->crc) { s->z_err = Z_DATA_ERROR; } else { (void)getLong(s); /* The uncompressed length returned by above getlong() may * be different from s->stream.total_out) in case of * concatenated .gz files. Check for such files: */ check_header(s); if (s->z_err == Z_OK) { uLong total_in = s->stream.total_in; uLong total_out = s->stream.total_out; inflateReset(&(s->stream)); s->stream.total_in = total_in; s->stream.total_out = total_out; s->crc = crc32(0L, Z_NULL, 0); } } } if (s->z_err != Z_OK || s->z_eof) break; } s->crc = crc32(s->crc, start, (uInt)(s->stream.next_out - start)); return (int)(len - s->stream.avail_out); } /* =========================================================================== Reads one byte from the compressed file. gzgetc returns this byte or -1 in case of end of file or error. */ int ZEXPORT gzgetc(file) gzFile file; { unsigned char c; return gzread(file, &c, 1) == 1 ? c : -1; } /* =========================================================================== Reads bytes from the compressed file until len-1 characters are read, or a newline character is read and transferred to buf, or an end-of-file condition is encountered. The string is then terminated with a null character. gzgets returns buf, or Z_NULL in case of error. The current implementation is not optimized at all. */ char * ZEXPORT gzgets(file, buf, len) gzFile file; char *buf; int len; { char *b = buf; if (buf == Z_NULL || len <= 0) return Z_NULL; while (--len > 0 && gzread(file, buf, 1) == 1 && *buf++ != '\n') ; *buf = '\0'; return b == buf && len > 0 ? Z_NULL : b; } #ifndef NO_DEFLATE /* =========================================================================== Writes the given number of uncompressed bytes into the compressed file. gzwrite returns the number of bytes actually written (0 in case of error). */ int ZEXPORT gzwrite (file, buf, len) gzFile file; const voidp buf; unsigned len; { gz_stream *s = (gz_stream*)file; if (s == NULL || s->mode != 'w') return Z_STREAM_ERROR; s->stream.next_in = (Bytef*)buf; s->stream.avail_in = len; while (s->stream.avail_in != 0) { if (s->stream.avail_out == 0) { s->stream.next_out = s->outbuf; if (fwrite(s->outbuf, 1, Z_BUFSIZE, s->file) != Z_BUFSIZE) { s->z_err = Z_ERRNO; break; } s->stream.avail_out = Z_BUFSIZE; } s->z_err = deflate(&(s->stream), Z_NO_FLUSH); if (s->z_err != Z_OK) break; } s->crc = crc32(s->crc, (const Bytef *)buf, len); return (int)(len - s->stream.avail_in); } /* =========================================================================== Converts, formats, and writes the args to the compressed file under control of the format string, as in fprintf. gzprintf returns the number of uncompressed bytes actually written (0 in case of error). */ #ifdef STDC #include int ZEXPORTVA gzprintf (gzFile file, const char *format, /* args */ ...) { char buf[Z_PRINTF_BUFSIZE]; va_list va; int len; va_start(va, format); #ifdef HAS_vsnprintf (void)vsnprintf(buf, sizeof(buf), format, va); #else (void)vsprintf(buf, format, va); #endif va_end(va); len = strlen(buf); /* some *sprintf don't return the nb of bytes written */ if (len <= 0) return 0; return gzwrite(file, buf, (unsigned)len); } #else /* not ANSI C */ int ZEXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20) gzFile file; const char *format; int a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20; { char buf[Z_PRINTF_BUFSIZE]; int len; #ifdef HAS_snprintf snprintf(buf, sizeof(buf), format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20); #else sprintf(buf, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20); #endif len = strlen(buf); /* old sprintf doesn't return the nb of bytes written */ if (len <= 0) return 0; return gzwrite(file, buf, len); } #endif /* =========================================================================== Writes c, converted to an unsigned char, into the compressed file. gzputc returns the value that was written, or -1 in case of error. */ int ZEXPORT gzputc(file, c) gzFile file; int c; { unsigned char cc = (unsigned char) c; /* required for big endian systems */ return gzwrite(file, &cc, 1) == 1 ? (int)cc : -1; } /* =========================================================================== Writes the given null-terminated string to the compressed file, excluding the terminating null character. gzputs returns the number of characters written, or -1 in case of error. */ int ZEXPORT gzputs(file, s) gzFile file; const char *s; { return gzwrite(file, (char*)s, (unsigned)strlen(s)); } /* =========================================================================== Flushes all pending output into the compressed file. The parameter flush is as in the deflate() function. */ local int do_flush (file, flush) gzFile file; int flush; { uInt len; int done = 0; gz_stream *s = (gz_stream*)file; if (s == NULL || s->mode != 'w') return Z_STREAM_ERROR; s->stream.avail_in = 0; /* should be zero already anyway */ for (;;) { len = Z_BUFSIZE - s->stream.avail_out; if (len != 0) { if ((uInt)fwrite(s->outbuf, 1, len, s->file) != len) { s->z_err = Z_ERRNO; return Z_ERRNO; } s->stream.next_out = s->outbuf; s->stream.avail_out = Z_BUFSIZE; } if (done) break; s->z_err = deflate(&(s->stream), flush); /* Ignore the second of two consecutive flushes: */ if (len == 0 && s->z_err == Z_BUF_ERROR) s->z_err = Z_OK; /* deflate has finished flushing only when it hasn't used up * all the available space in the output buffer: */ done = (s->stream.avail_out != 0 || s->z_err == Z_STREAM_END); if (s->z_err != Z_OK && s->z_err != Z_STREAM_END) break; } return s->z_err == Z_STREAM_END ? Z_OK : s->z_err; } int ZEXPORT gzflush (file, flush) gzFile file; int flush; { gz_stream *s = (gz_stream*)file; int err = do_flush (file, flush); if (err) return err; fflush(s->file); return s->z_err == Z_STREAM_END ? Z_OK : s->z_err; } #endif /* NO_DEFLATE */ /* =========================================================================== Sets the starting position for the next gzread or gzwrite on the given compressed file. The offset represents a number of bytes in the gzseek returns the resulting offset location as measured in bytes from the beginning of the uncompressed stream, or -1 in case of error. SEEK_END is not implemented, returns error. In this version of the library, gzseek can be extremely slow. */ z_off_t ZEXPORT gzseek (file, offset, whence) gzFile file; z_off_t offset; int whence; { gz_stream *s = (gz_stream*)file; if (s == NULL || whence == SEEK_END || s->z_err == Z_ERRNO || s->z_err == Z_DATA_ERROR) { return (z_off_t) -1L; } if (s->mode == 'w') { #ifdef NO_DEFLATE return -1L; #else if (whence == SEEK_SET) { offset -= s->stream.total_in; } if (offset < 0) return (z_off_t) -1L; /* At this point, offset is the number of zero bytes to write. */ if (s->inbuf == Z_NULL) { s->inbuf = (Byte*)ALLOC(Z_BUFSIZE); /* for seeking */ zmemzero(s->inbuf, Z_BUFSIZE); } while (offset > 0) { uInt size = Z_BUFSIZE; if (offset < Z_BUFSIZE) size = (uInt)offset; size = gzwrite(file, s->inbuf, size); if (size == 0) return (z_off_t) -1L; offset -= size; } return (z_off_t)s->stream.total_in; #endif } /* Rest of function is for reading only */ /* compute absolute position */ if (whence == SEEK_CUR) { offset += s->stream.total_out; } if (offset < 0) return (z_off_t) -1L; if (s->transparent) { /* map to fseek */ s->stream.avail_in = 0; s->stream.next_in = s->inbuf; if (fseek(s->file, offset, SEEK_SET) < 0) return (z_off_t) -1L; s->stream.total_in = s->stream.total_out = (uLong)offset; return offset; } /* For a negative seek, rewind and use positive seek */ if ((uLong)offset >= s->stream.total_out) { offset -= s->stream.total_out; } else if (gzrewind(file) < 0) { return (z_off_t) -1L; } /* offset is now the number of bytes to skip. */ if (offset != 0 && s->outbuf == Z_NULL) { s->outbuf = (Byte*)ALLOC(Z_BUFSIZE); } while (offset > 0) { int size = Z_BUFSIZE; if (offset < Z_BUFSIZE) size = (int)offset; size = gzread(file, s->outbuf, (uInt)size); if (size <= 0) return (z_off_t) -1L; offset -= size; } return (z_off_t)s->stream.total_out; } /* =========================================================================== Rewinds input file. */ int ZEXPORT gzrewind (file) gzFile file; { gz_stream *s = (gz_stream*)file; if (s == NULL || s->mode != 'r') return -1; s->z_err = Z_OK; s->z_eof = 0; s->stream.avail_in = 0; s->stream.next_in = s->inbuf; s->crc = crc32(0L, Z_NULL, 0); if (s->startpos == 0) { /* not a compressed file */ rewind(s->file); return 0; } (void) inflateReset(&s->stream); return fseek(s->file, s->startpos, SEEK_SET); } /* =========================================================================== Returns the starting position for the next gzread or gzwrite on the given compressed file. This position represents a number of bytes in the uncompressed data stream. */ z_off_t ZEXPORT gztell (file) gzFile file; { return gzseek(file, 0L, SEEK_CUR); } /* =========================================================================== Returns 1 when EOF has previously been detected reading the given input stream, otherwise zero. */ int ZEXPORT gzeof (file) gzFile file; { gz_stream *s = (gz_stream*)file; return (s == NULL || s->mode != 'r') ? 0 : s->z_eof; } /* =========================================================================== Outputs a long in LSB order to the given file */ local void putLong (file, x) FILE *file; uLong x; { int n; for (n = 0; n < 4; n++) { fputc((int)(x & 0xff), file); x >>= 8; } } /* =========================================================================== Reads a long in LSB order from the given gz_stream. Sets z_err in case of error. */ local uLong getLong (s) gz_stream *s; { uLong x = (uLong)get_byte(s); int c; x += ((uLong)get_byte(s))<<8; x += ((uLong)get_byte(s))<<16; c = get_byte(s); if (c == EOF) s->z_err = Z_DATA_ERROR; x += ((uLong)c)<<24; return x; } /* =========================================================================== Flushes all pending output if necessary, closes the compressed file and deallocates all the (de)compression state. */ int ZEXPORT gzclose (file) gzFile file; { int err; gz_stream *s = (gz_stream*)file; if (s == NULL) return Z_STREAM_ERROR; if (s->mode == 'w') { #ifdef NO_DEFLATE return Z_STREAM_ERROR; #else err = do_flush (file, Z_FINISH); if (err != Z_OK) return destroy((gz_stream*)file); putLong (s->file, s->crc); putLong (s->file, s->stream.total_in); #endif } return destroy((gz_stream*)file); } /* =========================================================================== Returns the error message for the last error which occured on the given compressed file. errnum is set to zlib error number. If an error occured in the file system and not in the compression library, errnum is set to Z_ERRNO and the application may consult errno to get the exact error code. */ const char* ZEXPORT gzerror (file, errnum) gzFile file; int *errnum; { char *m; gz_stream *s = (gz_stream*)file; if (s == NULL) { *errnum = Z_STREAM_ERROR; return (const char*)ERR_MSG(Z_STREAM_ERROR); } *errnum = s->z_err; if (*errnum == Z_OK) return (const char*)""; m = (char*)(*errnum == Z_ERRNO ? zstrerror(errno) : s->stream.msg); if (m == NULL || *m == '\0') m = (char*)ERR_MSG(s->z_err); TRYFREE(s->msg); s->msg = (char*)ALLOC(strlen(s->path) + strlen(m) + 3); strcpy(s->msg, s->path); strcat(s->msg, ": "); strcat(s->msg, m); return (const char*)s->msg; }