nuclear@2: /* gzio.c -- IO on .gz files nuclear@2: * Copyright (C) 1995-2005 Jean-loup Gailly. nuclear@2: * For conditions of distribution and use, see copyright notice in zlib.h nuclear@2: * nuclear@2: * Compile this file with -DNO_GZCOMPRESS to avoid the compression code. nuclear@2: */ nuclear@2: nuclear@2: /* @(#) $Id$ */ nuclear@2: nuclear@2: #include nuclear@2: nuclear@2: #include "zutil.h" nuclear@2: nuclear@2: #ifdef NO_DEFLATE /* for compatibility with old definition */ nuclear@2: # define NO_GZCOMPRESS nuclear@2: #endif nuclear@2: nuclear@2: #ifndef NO_DUMMY_DECL nuclear@2: struct internal_state {int dummy;}; /* for buggy compilers */ nuclear@2: #endif nuclear@2: nuclear@2: #ifndef Z_BUFSIZE nuclear@2: # ifdef MAXSEG_64K nuclear@2: # define Z_BUFSIZE 4096 /* minimize memory usage for 16-bit DOS */ nuclear@2: # else nuclear@2: # define Z_BUFSIZE 16384 nuclear@2: # endif nuclear@2: #endif nuclear@2: #ifndef Z_PRINTF_BUFSIZE nuclear@2: # define Z_PRINTF_BUFSIZE 4096 nuclear@2: #endif nuclear@2: nuclear@2: #ifdef __MVS__ nuclear@2: # pragma map (fdopen , "\174\174FDOPEN") nuclear@2: FILE *fdopen(int, const char *); nuclear@2: #endif nuclear@2: nuclear@2: #ifndef STDC nuclear@2: extern voidp malloc OF((uInt size)); nuclear@2: extern void free OF((voidpf ptr)); nuclear@2: #endif nuclear@2: nuclear@2: #define ALLOC(size) malloc(size) nuclear@2: #define TRYFREE(p) {if (p) free(p);} nuclear@2: nuclear@2: static int const gz_magic[2] = {0x1f, 0x8b}; /* gzip magic header */ nuclear@2: nuclear@2: /* gzip flag byte */ nuclear@2: #define ASCII_FLAG 0x01 /* bit 0 set: file probably ascii text */ nuclear@2: #define HEAD_CRC 0x02 /* bit 1 set: header CRC present */ nuclear@2: #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */ nuclear@2: #define ORIG_NAME 0x08 /* bit 3 set: original file name present */ nuclear@2: #define COMMENT 0x10 /* bit 4 set: file comment present */ nuclear@2: #define RESERVED 0xE0 /* bits 5..7: reserved */ nuclear@2: nuclear@2: typedef struct gz_stream { nuclear@2: z_stream stream; nuclear@2: int z_err; /* error code for last stream operation */ nuclear@2: int z_eof; /* set if end of input file */ nuclear@2: FILE *file; /* .gz file */ nuclear@2: Byte *inbuf; /* input buffer */ nuclear@2: Byte *outbuf; /* output buffer */ nuclear@2: uLong crc; /* crc32 of uncompressed data */ nuclear@2: char *msg; /* error message */ nuclear@2: char *path; /* path name for debugging only */ nuclear@2: int transparent; /* 1 if input file is not a .gz file */ nuclear@2: char mode; /* 'w' or 'r' */ nuclear@2: z_off_t start; /* start of compressed data in file (header skipped) */ nuclear@2: z_off_t in; /* bytes into deflate or inflate */ nuclear@2: z_off_t out; /* bytes out of deflate or inflate */ nuclear@2: int back; /* one character push-back */ nuclear@2: int last; /* true if push-back is last character */ nuclear@2: } gz_stream; nuclear@2: nuclear@2: nuclear@2: local gzFile gz_open OF((const char *path, const char *mode, int fd)); nuclear@2: local int do_flush OF((gzFile file, int flush)); nuclear@2: local int get_byte OF((gz_stream *s)); nuclear@2: local void check_header OF((gz_stream *s)); nuclear@2: local int destroy OF((gz_stream *s)); nuclear@2: local void putLong OF((FILE *file, uLong x)); nuclear@2: local uLong getLong OF((gz_stream *s)); nuclear@2: nuclear@2: /* =========================================================================== nuclear@2: Opens a gzip (.gz) file for reading or writing. The mode parameter nuclear@2: is as in fopen ("rb" or "wb"). The file is given either by file descriptor nuclear@2: or path name (if fd == -1). nuclear@2: gz_open returns NULL if the file could not be opened or if there was nuclear@2: insufficient memory to allocate the (de)compression state; errno nuclear@2: can be checked to distinguish the two cases (if errno is zero, the nuclear@2: zlib error is Z_MEM_ERROR). nuclear@2: */ nuclear@2: local gzFile gz_open (path, mode, fd) nuclear@2: const char *path; nuclear@2: const char *mode; nuclear@2: int fd; nuclear@2: { nuclear@2: int err; nuclear@2: int level = Z_DEFAULT_COMPRESSION; /* compression level */ nuclear@2: int strategy = Z_DEFAULT_STRATEGY; /* compression strategy */ nuclear@2: char *p = (char*)mode; nuclear@2: gz_stream *s; nuclear@2: char fmode[80]; /* copy of mode, without the compression level */ nuclear@2: char *m = fmode; nuclear@2: nuclear@2: if (!path || !mode) return Z_NULL; nuclear@2: nuclear@2: s = (gz_stream *)ALLOC(sizeof(gz_stream)); nuclear@2: if (!s) return Z_NULL; nuclear@2: nuclear@2: s->stream.zalloc = (alloc_func)0; nuclear@2: s->stream.zfree = (free_func)0; nuclear@2: s->stream.opaque = (voidpf)0; nuclear@2: s->stream.next_in = s->inbuf = Z_NULL; nuclear@2: s->stream.next_out = s->outbuf = Z_NULL; nuclear@2: s->stream.avail_in = s->stream.avail_out = 0; nuclear@2: s->file = NULL; nuclear@2: s->z_err = Z_OK; nuclear@2: s->z_eof = 0; nuclear@2: s->in = 0; nuclear@2: s->out = 0; nuclear@2: s->back = EOF; nuclear@2: s->crc = crc32(0L, Z_NULL, 0); nuclear@2: s->msg = NULL; nuclear@2: s->transparent = 0; nuclear@2: nuclear@2: s->path = (char*)ALLOC(strlen(path)+1); nuclear@2: if (s->path == NULL) { nuclear@2: return destroy(s), (gzFile)Z_NULL; nuclear@2: } nuclear@2: strcpy(s->path, path); /* do this early for debugging */ nuclear@2: nuclear@2: s->mode = '\0'; nuclear@2: do { nuclear@2: if (*p == 'r') s->mode = 'r'; nuclear@2: if (*p == 'w' || *p == 'a') s->mode = 'w'; nuclear@2: if (*p >= '0' && *p <= '9') { nuclear@2: level = *p - '0'; nuclear@2: } else if (*p == 'f') { nuclear@2: strategy = Z_FILTERED; nuclear@2: } else if (*p == 'h') { nuclear@2: strategy = Z_HUFFMAN_ONLY; nuclear@2: } else if (*p == 'R') { nuclear@2: strategy = Z_RLE; nuclear@2: } else { nuclear@2: *m++ = *p; /* copy the mode */ nuclear@2: } nuclear@2: } while (*p++ && m != fmode + sizeof(fmode)); nuclear@2: if (s->mode == '\0') return destroy(s), (gzFile)Z_NULL; nuclear@2: nuclear@2: if (s->mode == 'w') { nuclear@2: #ifdef NO_GZCOMPRESS nuclear@2: err = Z_STREAM_ERROR; nuclear@2: #else nuclear@2: err = deflateInit2(&(s->stream), level, nuclear@2: Z_DEFLATED, -MAX_WBITS, DEF_MEM_LEVEL, strategy); nuclear@2: /* windowBits is passed < 0 to suppress zlib header */ nuclear@2: nuclear@2: s->stream.next_out = s->outbuf = (Byte*)ALLOC(Z_BUFSIZE); nuclear@2: #endif nuclear@2: if (err != Z_OK || s->outbuf == Z_NULL) { nuclear@2: return destroy(s), (gzFile)Z_NULL; nuclear@2: } nuclear@2: } else { nuclear@2: s->stream.next_in = s->inbuf = (Byte*)ALLOC(Z_BUFSIZE); nuclear@2: nuclear@2: err = inflateInit2(&(s->stream), -MAX_WBITS); nuclear@2: /* windowBits is passed < 0 to tell that there is no zlib header. nuclear@2: * Note that in this case inflate *requires* an extra "dummy" byte nuclear@2: * after the compressed stream in order to complete decompression and nuclear@2: * return Z_STREAM_END. Here the gzip CRC32 ensures that 4 bytes are nuclear@2: * present after the compressed stream. nuclear@2: */ nuclear@2: if (err != Z_OK || s->inbuf == Z_NULL) { nuclear@2: return destroy(s), (gzFile)Z_NULL; nuclear@2: } nuclear@2: } nuclear@2: s->stream.avail_out = Z_BUFSIZE; nuclear@2: nuclear@2: errno = 0; nuclear@2: s->file = fd < 0 ? F_OPEN(path, fmode) : (FILE*)fdopen(fd, fmode); nuclear@2: nuclear@2: if (s->file == NULL) { nuclear@2: return destroy(s), (gzFile)Z_NULL; nuclear@2: } nuclear@2: if (s->mode == 'w') { nuclear@2: /* Write a very simple .gz header: nuclear@2: */ nuclear@2: fprintf(s->file, "%c%c%c%c%c%c%c%c%c%c", gz_magic[0], gz_magic[1], nuclear@2: Z_DEFLATED, 0 /*flags*/, 0,0,0,0 /*time*/, 0 /*xflags*/, OS_CODE); nuclear@2: s->start = 10L; nuclear@2: /* We use 10L instead of ftell(s->file) to because ftell causes an nuclear@2: * fflush on some systems. This version of the library doesn't use nuclear@2: * start anyway in write mode, so this initialization is not nuclear@2: * necessary. nuclear@2: */ nuclear@2: } else { nuclear@2: check_header(s); /* skip the .gz header */ nuclear@2: s->start = ftell(s->file) - s->stream.avail_in; nuclear@2: } nuclear@2: nuclear@2: return (gzFile)s; nuclear@2: } nuclear@2: nuclear@2: /* =========================================================================== nuclear@2: Opens a gzip (.gz) file for reading or writing. nuclear@2: */ nuclear@2: gzFile ZEXPORT gzopen (path, mode) nuclear@2: const char *path; nuclear@2: const char *mode; nuclear@2: { nuclear@2: return gz_open (path, mode, -1); nuclear@2: } nuclear@2: nuclear@2: /* =========================================================================== nuclear@2: Associate a gzFile with the file descriptor fd. fd is not dup'ed here nuclear@2: to mimic the behavio(u)r of fdopen. nuclear@2: */ nuclear@2: gzFile ZEXPORT gzdopen (fd, mode) nuclear@2: int fd; nuclear@2: const char *mode; nuclear@2: { nuclear@2: char name[46]; /* allow for up to 128-bit integers */ nuclear@2: nuclear@2: if (fd < 0) return (gzFile)Z_NULL; nuclear@2: sprintf(name, "", fd); /* for debugging */ nuclear@2: nuclear@2: return gz_open (name, mode, fd); nuclear@2: } nuclear@2: nuclear@2: /* =========================================================================== nuclear@2: * Update the compression level and strategy nuclear@2: */ nuclear@2: int ZEXPORT gzsetparams (file, level, strategy) nuclear@2: gzFile file; nuclear@2: int level; nuclear@2: int strategy; nuclear@2: { nuclear@2: gz_stream *s = (gz_stream*)file; nuclear@2: nuclear@2: if (s == NULL || s->mode != 'w') return Z_STREAM_ERROR; nuclear@2: nuclear@2: /* Make room to allow flushing */ nuclear@2: if (s->stream.avail_out == 0) { nuclear@2: nuclear@2: s->stream.next_out = s->outbuf; nuclear@2: if (fwrite(s->outbuf, 1, Z_BUFSIZE, s->file) != Z_BUFSIZE) { nuclear@2: s->z_err = Z_ERRNO; nuclear@2: } nuclear@2: s->stream.avail_out = Z_BUFSIZE; nuclear@2: } nuclear@2: nuclear@2: return deflateParams (&(s->stream), level, strategy); nuclear@2: } nuclear@2: nuclear@2: /* =========================================================================== nuclear@2: Read a byte from a gz_stream; update next_in and avail_in. Return EOF nuclear@2: for end of file. nuclear@2: IN assertion: the stream s has been sucessfully opened for reading. nuclear@2: */ nuclear@2: local int get_byte(s) nuclear@2: gz_stream *s; nuclear@2: { nuclear@2: if (s->z_eof) return EOF; nuclear@2: if (s->stream.avail_in == 0) { nuclear@2: errno = 0; nuclear@2: s->stream.avail_in = (uInt)fread(s->inbuf, 1, Z_BUFSIZE, s->file); nuclear@2: if (s->stream.avail_in == 0) { nuclear@2: s->z_eof = 1; nuclear@2: if (ferror(s->file)) s->z_err = Z_ERRNO; nuclear@2: return EOF; nuclear@2: } nuclear@2: s->stream.next_in = s->inbuf; nuclear@2: } nuclear@2: s->stream.avail_in--; nuclear@2: return *(s->stream.next_in)++; nuclear@2: } nuclear@2: nuclear@2: /* =========================================================================== nuclear@2: Check the gzip header of a gz_stream opened for reading. Set the stream nuclear@2: mode to transparent if the gzip magic header is not present; set s->err nuclear@2: to Z_DATA_ERROR if the magic header is present but the rest of the header nuclear@2: is incorrect. nuclear@2: IN assertion: the stream s has already been created sucessfully; nuclear@2: s->stream.avail_in is zero for the first time, but may be non-zero nuclear@2: for concatenated .gz files. nuclear@2: */ nuclear@2: local void check_header(s) nuclear@2: gz_stream *s; nuclear@2: { nuclear@2: int method; /* method byte */ nuclear@2: int flags; /* flags byte */ nuclear@2: uInt len; nuclear@2: int c; nuclear@2: nuclear@2: /* Assure two bytes in the buffer so we can peek ahead -- handle case nuclear@2: where first byte of header is at the end of the buffer after the last nuclear@2: gzip segment */ nuclear@2: len = s->stream.avail_in; nuclear@2: if (len < 2) { nuclear@2: if (len) s->inbuf[0] = s->stream.next_in[0]; nuclear@2: errno = 0; nuclear@2: len = (uInt)fread(s->inbuf + len, 1, Z_BUFSIZE >> len, s->file); nuclear@2: if (len == 0 && ferror(s->file)) s->z_err = Z_ERRNO; nuclear@2: s->stream.avail_in += len; nuclear@2: s->stream.next_in = s->inbuf; nuclear@2: if (s->stream.avail_in < 2) { nuclear@2: s->transparent = s->stream.avail_in; nuclear@2: return; nuclear@2: } nuclear@2: } nuclear@2: nuclear@2: /* Peek ahead to check the gzip magic header */ nuclear@2: if (s->stream.next_in[0] != gz_magic[0] || nuclear@2: s->stream.next_in[1] != gz_magic[1]) { nuclear@2: s->transparent = 1; nuclear@2: return; nuclear@2: } nuclear@2: s->stream.avail_in -= 2; nuclear@2: s->stream.next_in += 2; nuclear@2: nuclear@2: /* Check the rest of the gzip header */ nuclear@2: method = get_byte(s); nuclear@2: flags = get_byte(s); nuclear@2: if (method != Z_DEFLATED || (flags & RESERVED) != 0) { nuclear@2: s->z_err = Z_DATA_ERROR; nuclear@2: return; nuclear@2: } nuclear@2: nuclear@2: /* Discard time, xflags and OS code: */ nuclear@2: for (len = 0; len < 6; len++) (void)get_byte(s); nuclear@2: nuclear@2: if ((flags & EXTRA_FIELD) != 0) { /* skip the extra field */ nuclear@2: len = (uInt)get_byte(s); nuclear@2: len += ((uInt)get_byte(s))<<8; nuclear@2: /* len is garbage if EOF but the loop below will quit anyway */ nuclear@2: while (len-- != 0 && get_byte(s) != EOF) ; nuclear@2: } nuclear@2: if ((flags & ORIG_NAME) != 0) { /* skip the original file name */ nuclear@2: while ((c = get_byte(s)) != 0 && c != EOF) ; nuclear@2: } nuclear@2: if ((flags & COMMENT) != 0) { /* skip the .gz file comment */ nuclear@2: while ((c = get_byte(s)) != 0 && c != EOF) ; nuclear@2: } nuclear@2: if ((flags & HEAD_CRC) != 0) { /* skip the header crc */ nuclear@2: for (len = 0; len < 2; len++) (void)get_byte(s); nuclear@2: } nuclear@2: s->z_err = s->z_eof ? Z_DATA_ERROR : Z_OK; nuclear@2: } nuclear@2: nuclear@2: /* =========================================================================== nuclear@2: * Cleanup then free the given gz_stream. Return a zlib error code. nuclear@2: Try freeing in the reverse order of allocations. nuclear@2: */ nuclear@2: local int destroy (s) nuclear@2: gz_stream *s; nuclear@2: { nuclear@2: int err = Z_OK; nuclear@2: nuclear@2: if (!s) return Z_STREAM_ERROR; nuclear@2: nuclear@2: TRYFREE(s->msg); nuclear@2: nuclear@2: if (s->stream.state != NULL) { nuclear@2: if (s->mode == 'w') { nuclear@2: #ifdef NO_GZCOMPRESS nuclear@2: err = Z_STREAM_ERROR; nuclear@2: #else nuclear@2: err = deflateEnd(&(s->stream)); nuclear@2: #endif nuclear@2: } else if (s->mode == 'r') { nuclear@2: err = inflateEnd(&(s->stream)); nuclear@2: } nuclear@2: } nuclear@2: if (s->file != NULL && fclose(s->file)) { nuclear@2: #ifdef ESPIPE nuclear@2: if (errno != ESPIPE) /* fclose is broken for pipes in HP/UX */ nuclear@2: #endif nuclear@2: err = Z_ERRNO; nuclear@2: } nuclear@2: if (s->z_err < 0) err = s->z_err; nuclear@2: nuclear@2: TRYFREE(s->inbuf); nuclear@2: TRYFREE(s->outbuf); nuclear@2: TRYFREE(s->path); nuclear@2: TRYFREE(s); nuclear@2: return err; nuclear@2: } nuclear@2: nuclear@2: /* =========================================================================== nuclear@2: Reads the given number of uncompressed bytes from the compressed file. nuclear@2: gzread returns the number of bytes actually read (0 for end of file). nuclear@2: */ nuclear@2: int ZEXPORT gzread (file, buf, len) nuclear@2: gzFile file; nuclear@2: voidp buf; nuclear@2: unsigned len; nuclear@2: { nuclear@2: gz_stream *s = (gz_stream*)file; nuclear@2: Bytef *start = (Bytef*)buf; /* starting point for crc computation */ nuclear@2: Byte *next_out; /* == stream.next_out but not forced far (for MSDOS) */ nuclear@2: nuclear@2: if (s == NULL || s->mode != 'r') return Z_STREAM_ERROR; nuclear@2: nuclear@2: if (s->z_err == Z_DATA_ERROR || s->z_err == Z_ERRNO) return -1; nuclear@2: if (s->z_err == Z_STREAM_END) return 0; /* EOF */ nuclear@2: nuclear@2: next_out = (Byte*)buf; nuclear@2: s->stream.next_out = (Bytef*)buf; nuclear@2: s->stream.avail_out = len; nuclear@2: nuclear@2: if (s->stream.avail_out && s->back != EOF) { nuclear@2: *next_out++ = s->back; nuclear@2: s->stream.next_out++; nuclear@2: s->stream.avail_out--; nuclear@2: s->back = EOF; nuclear@2: s->out++; nuclear@2: start++; nuclear@2: if (s->last) { nuclear@2: s->z_err = Z_STREAM_END; nuclear@2: return 1; nuclear@2: } nuclear@2: } nuclear@2: nuclear@2: while (s->stream.avail_out != 0) { nuclear@2: nuclear@2: if (s->transparent) { nuclear@2: /* Copy first the lookahead bytes: */ nuclear@2: uInt n = s->stream.avail_in; nuclear@2: if (n > s->stream.avail_out) n = s->stream.avail_out; nuclear@2: if (n > 0) { nuclear@2: zmemcpy(s->stream.next_out, s->stream.next_in, n); nuclear@2: next_out += n; nuclear@2: s->stream.next_out = next_out; nuclear@2: s->stream.next_in += n; nuclear@2: s->stream.avail_out -= n; nuclear@2: s->stream.avail_in -= n; nuclear@2: } nuclear@2: if (s->stream.avail_out > 0) { nuclear@2: s->stream.avail_out -= nuclear@2: (uInt)fread(next_out, 1, s->stream.avail_out, s->file); nuclear@2: } nuclear@2: len -= s->stream.avail_out; nuclear@2: s->in += len; nuclear@2: s->out += len; nuclear@2: if (len == 0) s->z_eof = 1; nuclear@2: return (int)len; nuclear@2: } nuclear@2: if (s->stream.avail_in == 0 && !s->z_eof) { nuclear@2: nuclear@2: errno = 0; nuclear@2: s->stream.avail_in = (uInt)fread(s->inbuf, 1, Z_BUFSIZE, s->file); nuclear@2: if (s->stream.avail_in == 0) { nuclear@2: s->z_eof = 1; nuclear@2: if (ferror(s->file)) { nuclear@2: s->z_err = Z_ERRNO; nuclear@2: break; nuclear@2: } nuclear@2: } nuclear@2: s->stream.next_in = s->inbuf; nuclear@2: } nuclear@2: s->in += s->stream.avail_in; nuclear@2: s->out += s->stream.avail_out; nuclear@2: s->z_err = inflate(&(s->stream), Z_NO_FLUSH); nuclear@2: s->in -= s->stream.avail_in; nuclear@2: s->out -= s->stream.avail_out; nuclear@2: nuclear@2: if (s->z_err == Z_STREAM_END) { nuclear@2: /* Check CRC and original size */ nuclear@2: s->crc = crc32(s->crc, start, (uInt)(s->stream.next_out - start)); nuclear@2: start = s->stream.next_out; nuclear@2: nuclear@2: if (getLong(s) != s->crc) { nuclear@2: s->z_err = Z_DATA_ERROR; nuclear@2: } else { nuclear@2: (void)getLong(s); nuclear@2: /* The uncompressed length returned by above getlong() may be nuclear@2: * different from s->out in case of concatenated .gz files. nuclear@2: * Check for such files: nuclear@2: */ nuclear@2: check_header(s); nuclear@2: if (s->z_err == Z_OK) { nuclear@2: inflateReset(&(s->stream)); nuclear@2: s->crc = crc32(0L, Z_NULL, 0); nuclear@2: } nuclear@2: } nuclear@2: } nuclear@2: if (s->z_err != Z_OK || s->z_eof) break; nuclear@2: } nuclear@2: s->crc = crc32(s->crc, start, (uInt)(s->stream.next_out - start)); nuclear@2: nuclear@2: if (len == s->stream.avail_out && nuclear@2: (s->z_err == Z_DATA_ERROR || s->z_err == Z_ERRNO)) nuclear@2: return -1; nuclear@2: return (int)(len - s->stream.avail_out); nuclear@2: } nuclear@2: nuclear@2: nuclear@2: /* =========================================================================== nuclear@2: Reads one byte from the compressed file. gzgetc returns this byte nuclear@2: or -1 in case of end of file or error. nuclear@2: */ nuclear@2: int ZEXPORT gzgetc(file) nuclear@2: gzFile file; nuclear@2: { nuclear@2: unsigned char c; nuclear@2: nuclear@2: return gzread(file, &c, 1) == 1 ? c : -1; nuclear@2: } nuclear@2: nuclear@2: nuclear@2: /* =========================================================================== nuclear@2: Push one byte back onto the stream. nuclear@2: */ nuclear@2: int ZEXPORT gzungetc(c, file) nuclear@2: int c; nuclear@2: gzFile file; nuclear@2: { nuclear@2: gz_stream *s = (gz_stream*)file; nuclear@2: nuclear@2: if (s == NULL || s->mode != 'r' || c == EOF || s->back != EOF) return EOF; nuclear@2: s->back = c; nuclear@2: s->out--; nuclear@2: s->last = (s->z_err == Z_STREAM_END); nuclear@2: if (s->last) s->z_err = Z_OK; nuclear@2: s->z_eof = 0; nuclear@2: return c; nuclear@2: } nuclear@2: nuclear@2: nuclear@2: /* =========================================================================== nuclear@2: Reads bytes from the compressed file until len-1 characters are nuclear@2: read, or a newline character is read and transferred to buf, or an nuclear@2: end-of-file condition is encountered. The string is then terminated nuclear@2: with a null character. nuclear@2: gzgets returns buf, or Z_NULL in case of error. nuclear@2: nuclear@2: The current implementation is not optimized at all. nuclear@2: */ nuclear@2: char * ZEXPORT gzgets(file, buf, len) nuclear@2: gzFile file; nuclear@2: char *buf; nuclear@2: int len; nuclear@2: { nuclear@2: char *b = buf; nuclear@2: if (buf == Z_NULL || len <= 0) return Z_NULL; nuclear@2: nuclear@2: while (--len > 0 && gzread(file, buf, 1) == 1 && *buf++ != '\n') ; nuclear@2: *buf = '\0'; nuclear@2: return b == buf && len > 0 ? Z_NULL : b; nuclear@2: } nuclear@2: nuclear@2: nuclear@2: #ifndef NO_GZCOMPRESS nuclear@2: /* =========================================================================== nuclear@2: Writes the given number of uncompressed bytes into the compressed file. nuclear@2: gzwrite returns the number of bytes actually written (0 in case of error). nuclear@2: */ nuclear@2: int ZEXPORT gzwrite (file, buf, len) nuclear@2: gzFile file; nuclear@2: voidpc buf; nuclear@2: unsigned len; nuclear@2: { nuclear@2: gz_stream *s = (gz_stream*)file; nuclear@2: nuclear@2: if (s == NULL || s->mode != 'w') return Z_STREAM_ERROR; nuclear@2: nuclear@2: s->stream.next_in = (Bytef*)buf; nuclear@2: s->stream.avail_in = len; nuclear@2: nuclear@2: while (s->stream.avail_in != 0) { nuclear@2: nuclear@2: if (s->stream.avail_out == 0) { nuclear@2: nuclear@2: s->stream.next_out = s->outbuf; nuclear@2: if (fwrite(s->outbuf, 1, Z_BUFSIZE, s->file) != Z_BUFSIZE) { nuclear@2: s->z_err = Z_ERRNO; nuclear@2: break; nuclear@2: } nuclear@2: s->stream.avail_out = Z_BUFSIZE; nuclear@2: } nuclear@2: s->in += s->stream.avail_in; nuclear@2: s->out += s->stream.avail_out; nuclear@2: s->z_err = deflate(&(s->stream), Z_NO_FLUSH); nuclear@2: s->in -= s->stream.avail_in; nuclear@2: s->out -= s->stream.avail_out; nuclear@2: if (s->z_err != Z_OK) break; nuclear@2: } nuclear@2: s->crc = crc32(s->crc, (const Bytef *)buf, len); nuclear@2: nuclear@2: return (int)(len - s->stream.avail_in); nuclear@2: } nuclear@2: nuclear@2: nuclear@2: /* =========================================================================== nuclear@2: Converts, formats, and writes the args to the compressed file under nuclear@2: control of the format string, as in fprintf. gzprintf returns the number of nuclear@2: uncompressed bytes actually written (0 in case of error). nuclear@2: */ nuclear@2: #ifdef STDC nuclear@2: #include nuclear@2: nuclear@2: int ZEXPORTVA gzprintf (gzFile file, const char *format, /* args */ ...) nuclear@2: { nuclear@2: char buf[Z_PRINTF_BUFSIZE]; nuclear@2: va_list va; nuclear@2: int len; nuclear@2: nuclear@2: buf[sizeof(buf) - 1] = 0; nuclear@2: va_start(va, format); nuclear@2: #ifdef NO_vsnprintf nuclear@2: # ifdef HAS_vsprintf_void nuclear@2: (void)vsprintf(buf, format, va); nuclear@2: va_end(va); nuclear@2: for (len = 0; len < sizeof(buf); len++) nuclear@2: if (buf[len] == 0) break; nuclear@2: # else nuclear@2: len = vsprintf(buf, format, va); nuclear@2: va_end(va); nuclear@2: # endif nuclear@2: #else nuclear@2: # ifdef HAS_vsnprintf_void nuclear@2: (void)vsnprintf(buf, sizeof(buf), format, va); nuclear@2: va_end(va); nuclear@2: len = strlen(buf); nuclear@2: # else nuclear@2: len = vsnprintf(buf, sizeof(buf), format, va); nuclear@2: va_end(va); nuclear@2: # endif nuclear@2: #endif nuclear@2: if (len <= 0 || len >= (int)sizeof(buf) || buf[sizeof(buf) - 1] != 0) nuclear@2: return 0; nuclear@2: return gzwrite(file, buf, (unsigned)len); nuclear@2: } nuclear@2: #else /* not ANSI C */ nuclear@2: nuclear@2: int ZEXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, nuclear@2: a11, a12, a13, a14, a15, a16, a17, a18, a19, a20) nuclear@2: gzFile file; nuclear@2: const char *format; nuclear@2: int a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, nuclear@2: a11, a12, a13, a14, a15, a16, a17, a18, a19, a20; nuclear@2: { nuclear@2: char buf[Z_PRINTF_BUFSIZE]; nuclear@2: int len; nuclear@2: nuclear@2: buf[sizeof(buf) - 1] = 0; nuclear@2: #ifdef NO_snprintf nuclear@2: # ifdef HAS_sprintf_void nuclear@2: sprintf(buf, format, a1, a2, a3, a4, a5, a6, a7, a8, nuclear@2: a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20); nuclear@2: for (len = 0; len < sizeof(buf); len++) nuclear@2: if (buf[len] == 0) break; nuclear@2: # else nuclear@2: len = sprintf(buf, format, a1, a2, a3, a4, a5, a6, a7, a8, nuclear@2: a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20); nuclear@2: # endif nuclear@2: #else nuclear@2: # ifdef HAS_snprintf_void nuclear@2: snprintf(buf, sizeof(buf), format, a1, a2, a3, a4, a5, a6, a7, a8, nuclear@2: a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20); nuclear@2: len = strlen(buf); nuclear@2: # else nuclear@2: len = snprintf(buf, sizeof(buf), format, a1, a2, a3, a4, a5, a6, a7, a8, nuclear@2: a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20); nuclear@2: # endif nuclear@2: #endif nuclear@2: if (len <= 0 || len >= sizeof(buf) || buf[sizeof(buf) - 1] != 0) nuclear@2: return 0; nuclear@2: return gzwrite(file, buf, len); nuclear@2: } nuclear@2: #endif nuclear@2: nuclear@2: /* =========================================================================== nuclear@2: Writes c, converted to an unsigned char, into the compressed file. nuclear@2: gzputc returns the value that was written, or -1 in case of error. nuclear@2: */ nuclear@2: int ZEXPORT gzputc(file, c) nuclear@2: gzFile file; nuclear@2: int c; nuclear@2: { nuclear@2: unsigned char cc = (unsigned char) c; /* required for big endian systems */ nuclear@2: nuclear@2: return gzwrite(file, &cc, 1) == 1 ? (int)cc : -1; nuclear@2: } nuclear@2: nuclear@2: nuclear@2: /* =========================================================================== nuclear@2: Writes the given null-terminated string to the compressed file, excluding nuclear@2: the terminating null character. nuclear@2: gzputs returns the number of characters written, or -1 in case of error. nuclear@2: */ nuclear@2: int ZEXPORT gzputs(file, s) nuclear@2: gzFile file; nuclear@2: const char *s; nuclear@2: { nuclear@2: return gzwrite(file, (char*)s, (unsigned)strlen(s)); nuclear@2: } nuclear@2: nuclear@2: nuclear@2: /* =========================================================================== nuclear@2: Flushes all pending output into the compressed file. The parameter nuclear@2: flush is as in the deflate() function. nuclear@2: */ nuclear@2: local int do_flush (file, flush) nuclear@2: gzFile file; nuclear@2: int flush; nuclear@2: { nuclear@2: uInt len; nuclear@2: int done = 0; nuclear@2: gz_stream *s = (gz_stream*)file; nuclear@2: nuclear@2: if (s == NULL || s->mode != 'w') return Z_STREAM_ERROR; nuclear@2: nuclear@2: s->stream.avail_in = 0; /* should be zero already anyway */ nuclear@2: nuclear@2: for (;;) { nuclear@2: len = Z_BUFSIZE - s->stream.avail_out; nuclear@2: nuclear@2: if (len != 0) { nuclear@2: if ((uInt)fwrite(s->outbuf, 1, len, s->file) != len) { nuclear@2: s->z_err = Z_ERRNO; nuclear@2: return Z_ERRNO; nuclear@2: } nuclear@2: s->stream.next_out = s->outbuf; nuclear@2: s->stream.avail_out = Z_BUFSIZE; nuclear@2: } nuclear@2: if (done) break; nuclear@2: s->out += s->stream.avail_out; nuclear@2: s->z_err = deflate(&(s->stream), flush); nuclear@2: s->out -= s->stream.avail_out; nuclear@2: nuclear@2: /* Ignore the second of two consecutive flushes: */ nuclear@2: if (len == 0 && s->z_err == Z_BUF_ERROR) s->z_err = Z_OK; nuclear@2: nuclear@2: /* deflate has finished flushing only when it hasn't used up nuclear@2: * all the available space in the output buffer: nuclear@2: */ nuclear@2: done = (s->stream.avail_out != 0 || s->z_err == Z_STREAM_END); nuclear@2: nuclear@2: if (s->z_err != Z_OK && s->z_err != Z_STREAM_END) break; nuclear@2: } nuclear@2: return s->z_err == Z_STREAM_END ? Z_OK : s->z_err; nuclear@2: } nuclear@2: nuclear@2: int ZEXPORT gzflush (file, flush) nuclear@2: gzFile file; nuclear@2: int flush; nuclear@2: { nuclear@2: gz_stream *s = (gz_stream*)file; nuclear@2: int err = do_flush (file, flush); nuclear@2: nuclear@2: if (err) return err; nuclear@2: fflush(s->file); nuclear@2: return s->z_err == Z_STREAM_END ? Z_OK : s->z_err; nuclear@2: } nuclear@2: #endif /* NO_GZCOMPRESS */ nuclear@2: nuclear@2: /* =========================================================================== nuclear@2: Sets the starting position for the next gzread or gzwrite on the given nuclear@2: compressed file. The offset represents a number of bytes in the nuclear@2: gzseek returns the resulting offset location as measured in bytes from nuclear@2: the beginning of the uncompressed stream, or -1 in case of error. nuclear@2: SEEK_END is not implemented, returns error. nuclear@2: In this version of the library, gzseek can be extremely slow. nuclear@2: */ nuclear@2: z_off_t ZEXPORT gzseek (file, offset, whence) nuclear@2: gzFile file; nuclear@2: z_off_t offset; nuclear@2: int whence; nuclear@2: { nuclear@2: gz_stream *s = (gz_stream*)file; nuclear@2: nuclear@2: if (s == NULL || whence == SEEK_END || nuclear@2: s->z_err == Z_ERRNO || s->z_err == Z_DATA_ERROR) { nuclear@2: return -1L; nuclear@2: } nuclear@2: nuclear@2: if (s->mode == 'w') { nuclear@2: #ifdef NO_GZCOMPRESS nuclear@2: return -1L; nuclear@2: #else nuclear@2: if (whence == SEEK_SET) { nuclear@2: offset -= s->in; nuclear@2: } nuclear@2: if (offset < 0) return -1L; nuclear@2: nuclear@2: /* At this point, offset is the number of zero bytes to write. */ nuclear@2: if (s->inbuf == Z_NULL) { nuclear@2: s->inbuf = (Byte*)ALLOC(Z_BUFSIZE); /* for seeking */ nuclear@2: if (s->inbuf == Z_NULL) return -1L; nuclear@2: zmemzero(s->inbuf, Z_BUFSIZE); nuclear@2: } nuclear@2: while (offset > 0) { nuclear@2: uInt size = Z_BUFSIZE; nuclear@2: if (offset < Z_BUFSIZE) size = (uInt)offset; nuclear@2: nuclear@2: size = gzwrite(file, s->inbuf, size); nuclear@2: if (size == 0) return -1L; nuclear@2: nuclear@2: offset -= size; nuclear@2: } nuclear@2: return s->in; nuclear@2: #endif nuclear@2: } nuclear@2: /* Rest of function is for reading only */ nuclear@2: nuclear@2: /* compute absolute position */ nuclear@2: if (whence == SEEK_CUR) { nuclear@2: offset += s->out; nuclear@2: } nuclear@2: if (offset < 0) return -1L; nuclear@2: nuclear@2: if (s->transparent) { nuclear@2: /* map to fseek */ nuclear@2: s->back = EOF; nuclear@2: s->stream.avail_in = 0; nuclear@2: s->stream.next_in = s->inbuf; nuclear@2: if (fseek(s->file, offset, SEEK_SET) < 0) return -1L; nuclear@2: nuclear@2: s->in = s->out = offset; nuclear@2: return offset; nuclear@2: } nuclear@2: nuclear@2: /* For a negative seek, rewind and use positive seek */ nuclear@2: if (offset >= s->out) { nuclear@2: offset -= s->out; nuclear@2: } else if (gzrewind(file) < 0) { nuclear@2: return -1L; nuclear@2: } nuclear@2: /* offset is now the number of bytes to skip. */ nuclear@2: nuclear@2: if (offset != 0 && s->outbuf == Z_NULL) { nuclear@2: s->outbuf = (Byte*)ALLOC(Z_BUFSIZE); nuclear@2: if (s->outbuf == Z_NULL) return -1L; nuclear@2: } nuclear@2: if (offset && s->back != EOF) { nuclear@2: s->back = EOF; nuclear@2: s->out++; nuclear@2: offset--; nuclear@2: if (s->last) s->z_err = Z_STREAM_END; nuclear@2: } nuclear@2: while (offset > 0) { nuclear@2: int size = Z_BUFSIZE; nuclear@2: if (offset < Z_BUFSIZE) size = (int)offset; nuclear@2: nuclear@2: size = gzread(file, s->outbuf, (uInt)size); nuclear@2: if (size <= 0) return -1L; nuclear@2: offset -= size; nuclear@2: } nuclear@2: return s->out; nuclear@2: } nuclear@2: nuclear@2: /* =========================================================================== nuclear@2: Rewinds input file. nuclear@2: */ nuclear@2: int ZEXPORT gzrewind (file) nuclear@2: gzFile file; nuclear@2: { nuclear@2: gz_stream *s = (gz_stream*)file; nuclear@2: nuclear@2: if (s == NULL || s->mode != 'r') return -1; nuclear@2: nuclear@2: s->z_err = Z_OK; nuclear@2: s->z_eof = 0; nuclear@2: s->back = EOF; nuclear@2: s->stream.avail_in = 0; nuclear@2: s->stream.next_in = s->inbuf; nuclear@2: s->crc = crc32(0L, Z_NULL, 0); nuclear@2: if (!s->transparent) (void)inflateReset(&s->stream); nuclear@2: s->in = 0; nuclear@2: s->out = 0; nuclear@2: return fseek(s->file, s->start, SEEK_SET); nuclear@2: } nuclear@2: nuclear@2: /* =========================================================================== nuclear@2: Returns the starting position for the next gzread or gzwrite on the nuclear@2: given compressed file. This position represents a number of bytes in the nuclear@2: uncompressed data stream. nuclear@2: */ nuclear@2: z_off_t ZEXPORT gztell (file) nuclear@2: gzFile file; nuclear@2: { nuclear@2: return gzseek(file, 0L, SEEK_CUR); nuclear@2: } nuclear@2: nuclear@2: /* =========================================================================== nuclear@2: Returns 1 when EOF has previously been detected reading the given nuclear@2: input stream, otherwise zero. nuclear@2: */ nuclear@2: int ZEXPORT gzeof (file) nuclear@2: gzFile file; nuclear@2: { nuclear@2: gz_stream *s = (gz_stream*)file; nuclear@2: nuclear@2: /* With concatenated compressed files that can have embedded nuclear@2: * crc trailers, z_eof is no longer the only/best indicator of EOF nuclear@2: * on a gz_stream. Handle end-of-stream error explicitly here. nuclear@2: */ nuclear@2: if (s == NULL || s->mode != 'r') return 0; nuclear@2: if (s->z_eof) return 1; nuclear@2: return s->z_err == Z_STREAM_END; nuclear@2: } nuclear@2: nuclear@2: /* =========================================================================== nuclear@2: Returns 1 if reading and doing so transparently, otherwise zero. nuclear@2: */ nuclear@2: int ZEXPORT gzdirect (file) nuclear@2: gzFile file; nuclear@2: { nuclear@2: gz_stream *s = (gz_stream*)file; nuclear@2: nuclear@2: if (s == NULL || s->mode != 'r') return 0; nuclear@2: return s->transparent; nuclear@2: } nuclear@2: nuclear@2: /* =========================================================================== nuclear@2: Outputs a long in LSB order to the given file nuclear@2: */ nuclear@2: local void putLong (file, x) nuclear@2: FILE *file; nuclear@2: uLong x; nuclear@2: { nuclear@2: int n; nuclear@2: for (n = 0; n < 4; n++) { nuclear@2: fputc((int)(x & 0xff), file); nuclear@2: x >>= 8; nuclear@2: } nuclear@2: } nuclear@2: nuclear@2: /* =========================================================================== nuclear@2: Reads a long in LSB order from the given gz_stream. Sets z_err in case nuclear@2: of error. nuclear@2: */ nuclear@2: local uLong getLong (s) nuclear@2: gz_stream *s; nuclear@2: { nuclear@2: uLong x = (uLong)get_byte(s); nuclear@2: int c; nuclear@2: nuclear@2: x += ((uLong)get_byte(s))<<8; nuclear@2: x += ((uLong)get_byte(s))<<16; nuclear@2: c = get_byte(s); nuclear@2: if (c == EOF) s->z_err = Z_DATA_ERROR; nuclear@2: x += ((uLong)c)<<24; nuclear@2: return x; nuclear@2: } nuclear@2: nuclear@2: /* =========================================================================== nuclear@2: Flushes all pending output if necessary, closes the compressed file nuclear@2: and deallocates all the (de)compression state. nuclear@2: */ nuclear@2: int ZEXPORT gzclose (file) nuclear@2: gzFile file; nuclear@2: { nuclear@2: gz_stream *s = (gz_stream*)file; nuclear@2: nuclear@2: if (s == NULL) return Z_STREAM_ERROR; nuclear@2: nuclear@2: if (s->mode == 'w') { nuclear@2: #ifdef NO_GZCOMPRESS nuclear@2: return Z_STREAM_ERROR; nuclear@2: #else nuclear@2: if (do_flush (file, Z_FINISH) != Z_OK) nuclear@2: return destroy((gz_stream*)file); nuclear@2: nuclear@2: putLong (s->file, s->crc); nuclear@2: putLong (s->file, (uLong)(s->in & 0xffffffff)); nuclear@2: #endif nuclear@2: } nuclear@2: return destroy((gz_stream*)file); nuclear@2: } nuclear@2: nuclear@2: #ifdef STDC nuclear@2: # define zstrerror(errnum) strerror(errnum) nuclear@2: #else nuclear@2: # define zstrerror(errnum) "" nuclear@2: #endif nuclear@2: nuclear@2: /* =========================================================================== nuclear@2: Returns the error message for the last error which occurred on the nuclear@2: given compressed file. errnum is set to zlib error number. If an nuclear@2: error occurred in the file system and not in the compression library, nuclear@2: errnum is set to Z_ERRNO and the application may consult errno nuclear@2: to get the exact error code. nuclear@2: */ nuclear@2: const char * ZEXPORT gzerror (file, errnum) nuclear@2: gzFile file; nuclear@2: int *errnum; nuclear@2: { nuclear@2: char *m; nuclear@2: gz_stream *s = (gz_stream*)file; nuclear@2: nuclear@2: if (s == NULL) { nuclear@2: *errnum = Z_STREAM_ERROR; nuclear@2: return (const char*)ERR_MSG(Z_STREAM_ERROR); nuclear@2: } nuclear@2: *errnum = s->z_err; nuclear@2: if (*errnum == Z_OK) return (const char*)""; nuclear@2: nuclear@2: m = (char*)(*errnum == Z_ERRNO ? zstrerror(errno) : s->stream.msg); nuclear@2: nuclear@2: if (m == NULL || *m == '\0') m = (char*)ERR_MSG(s->z_err); nuclear@2: nuclear@2: TRYFREE(s->msg); nuclear@2: s->msg = (char*)ALLOC(strlen(s->path) + strlen(m) + 3); nuclear@2: if (s->msg == Z_NULL) return (const char*)ERR_MSG(Z_MEM_ERROR); nuclear@2: strcpy(s->msg, s->path); nuclear@2: strcat(s->msg, ": "); nuclear@2: strcat(s->msg, m); nuclear@2: return (const char*)s->msg; nuclear@2: } nuclear@2: nuclear@2: /* =========================================================================== nuclear@2: Clear the error and end-of-file flags, and do the same for the real file. nuclear@2: */ nuclear@2: void ZEXPORT gzclearerr (file) nuclear@2: gzFile file; nuclear@2: { nuclear@2: gz_stream *s = (gz_stream*)file; nuclear@2: nuclear@2: if (s == NULL) return; nuclear@2: if (s->z_err != Z_STREAM_END) s->z_err = Z_OK; nuclear@2: s->z_eof = 0; nuclear@2: clearerr(s->file); nuclear@2: }