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jeremybenn |
/* gzio.c -- IO on .gz files
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* Copyright (C) 1995-2005 Jean-loup Gailly.
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* For conditions of distribution and use, see copyright notice in zlib.h
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*
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* Compile this file with -DNO_GZCOMPRESS to avoid the compression code.
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*/
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/* @(#) $Id: gzio.c,v 1.1.1.2 2002/03/11 21:53:24 tromey Exp $ */
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#include <stdio.h>
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#include "zutil.h"
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#ifdef NO_DEFLATE /* for compatibility with old definition */
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# define NO_GZCOMPRESS
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#endif
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#ifndef NO_DUMMY_DECL
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struct internal_state {int dummy;}; /* for buggy compilers */
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#endif
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#ifndef Z_BUFSIZE
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# ifdef MAXSEG_64K
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# define Z_BUFSIZE 4096 /* minimize memory usage for 16-bit DOS */
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# else
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# define Z_BUFSIZE 16384
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# endif
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#endif
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#ifndef Z_PRINTF_BUFSIZE
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# define Z_PRINTF_BUFSIZE 4096
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#endif
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#ifdef __MVS__
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# pragma map (fdopen , "\174\174FDOPEN")
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FILE *fdopen(int, const char *);
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#endif
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#ifndef STDC
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extern voidp malloc OF((uInt size));
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extern void free OF((voidpf ptr));
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#endif
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#define ALLOC(size) malloc(size)
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#define TRYFREE(p) {if (p) free(p);}
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static int const gz_magic[2] = {0x1f, 0x8b}; /* gzip magic header */
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/* gzip flag byte */
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#define ASCII_FLAG 0x01 /* bit 0 set: file probably ascii text */
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#define HEAD_CRC 0x02 /* bit 1 set: header CRC present */
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#define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
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#define ORIG_NAME 0x08 /* bit 3 set: original file name present */
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#define COMMENT 0x10 /* bit 4 set: file comment present */
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#define RESERVED 0xE0 /* bits 5..7: reserved */
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typedef struct gz_stream {
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z_stream stream;
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int z_err; /* error code for last stream operation */
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int z_eof; /* set if end of input file */
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FILE *file; /* .gz file */
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Byte *inbuf; /* input buffer */
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Byte *outbuf; /* output buffer */
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uLong crc; /* crc32 of uncompressed data */
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char *msg; /* error message */
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char *path; /* path name for debugging only */
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int transparent; /* 1 if input file is not a .gz file */
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char mode; /* 'w' or 'r' */
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z_off_t start; /* start of compressed data in file (header skipped) */
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z_off_t in; /* bytes into deflate or inflate */
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z_off_t out; /* bytes out of deflate or inflate */
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int back; /* one character push-back */
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int last; /* true if push-back is last character */
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} gz_stream;
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local gzFile gz_open OF((const char *path, const char *mode, int fd));
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local int do_flush OF((gzFile file, int flush));
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local int get_byte OF((gz_stream *s));
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local void check_header OF((gz_stream *s));
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local int destroy OF((gz_stream *s));
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local void putLong OF((FILE *file, uLong x));
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local uLong getLong OF((gz_stream *s));
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/* ===========================================================================
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Opens a gzip (.gz) file for reading or writing. The mode parameter
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is as in fopen ("rb" or "wb"). The file is given either by file descriptor
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or path name (if fd == -1).
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gz_open returns NULL if the file could not be opened or if there was
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insufficient memory to allocate the (de)compression state; errno
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can be checked to distinguish the two cases (if errno is zero, the
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zlib error is Z_MEM_ERROR).
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*/
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local gzFile gz_open (path, mode, fd)
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const char *path;
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const char *mode;
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int fd;
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{
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int err;
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int level = Z_DEFAULT_COMPRESSION; /* compression level */
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int strategy = Z_DEFAULT_STRATEGY; /* compression strategy */
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char *p = (char*)mode;
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gz_stream *s;
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char fmode[80]; /* copy of mode, without the compression level */
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char *m = fmode;
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if (!path || !mode) return Z_NULL;
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s = (gz_stream *)ALLOC(sizeof(gz_stream));
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if (!s) return Z_NULL;
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s->stream.zalloc = (alloc_func)0;
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s->stream.zfree = (free_func)0;
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s->stream.opaque = (voidpf)0;
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s->stream.next_in = s->inbuf = Z_NULL;
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s->stream.next_out = s->outbuf = Z_NULL;
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s->stream.avail_in = s->stream.avail_out = 0;
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s->file = NULL;
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s->z_err = Z_OK;
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s->z_eof = 0;
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s->in = 0;
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s->out = 0;
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s->back = EOF;
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s->crc = crc32(0L, Z_NULL, 0);
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s->msg = NULL;
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s->transparent = 0;
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s->path = (char*)ALLOC(strlen(path)+1);
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if (s->path == NULL) {
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return destroy(s), (gzFile)Z_NULL;
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}
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strcpy(s->path, path); /* do this early for debugging */
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s->mode = '\0';
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do {
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if (*p == 'r') s->mode = 'r';
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if (*p == 'w' || *p == 'a') s->mode = 'w';
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if (*p >= '0' && *p <= '9') {
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level = *p - '0';
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} else if (*p == 'f') {
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strategy = Z_FILTERED;
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} else if (*p == 'h') {
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strategy = Z_HUFFMAN_ONLY;
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} else if (*p == 'R') {
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strategy = Z_RLE;
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} else {
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*m++ = *p; /* copy the mode */
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}
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} while (*p++ && m != fmode + sizeof(fmode));
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if (s->mode == '\0') return destroy(s), (gzFile)Z_NULL;
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if (s->mode == 'w') {
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#ifdef NO_GZCOMPRESS
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err = Z_STREAM_ERROR;
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#else
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err = deflateInit2(&(s->stream), level,
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Z_DEFLATED, -MAX_WBITS, DEF_MEM_LEVEL, strategy);
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/* windowBits is passed < 0 to suppress zlib header */
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s->stream.next_out = s->outbuf = (Byte*)ALLOC(Z_BUFSIZE);
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#endif
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if (err != Z_OK || s->outbuf == Z_NULL) {
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return destroy(s), (gzFile)Z_NULL;
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}
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} else {
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s->stream.next_in = s->inbuf = (Byte*)ALLOC(Z_BUFSIZE);
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err = inflateInit2(&(s->stream), -MAX_WBITS);
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/* windowBits is passed < 0 to tell that there is no zlib header.
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* Note that in this case inflate *requires* an extra "dummy" byte
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* after the compressed stream in order to complete decompression and
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* return Z_STREAM_END. Here the gzip CRC32 ensures that 4 bytes are
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* present after the compressed stream.
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*/
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if (err != Z_OK || s->inbuf == Z_NULL) {
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return destroy(s), (gzFile)Z_NULL;
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}
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}
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s->stream.avail_out = Z_BUFSIZE;
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errno = 0;
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s->file = fd < 0 ? F_OPEN(path, fmode) : (FILE*)fdopen(fd, fmode);
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if (s->file == NULL) {
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return destroy(s), (gzFile)Z_NULL;
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}
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if (s->mode == 'w') {
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/* Write a very simple .gz header:
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*/
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fprintf(s->file, "%c%c%c%c%c%c%c%c%c%c", gz_magic[0], gz_magic[1],
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Z_DEFLATED, 0 /*flags*/, 0,0,0,0 /*time*/, 0 /*xflags*/, OS_CODE);
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s->start = 10L;
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/* We use 10L instead of ftell(s->file) to because ftell causes an
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* fflush on some systems. This version of the library doesn't use
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* start anyway in write mode, so this initialization is not
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* necessary.
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*/
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} else {
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check_header(s); /* skip the .gz header */
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s->start = ftell(s->file) - s->stream.avail_in;
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}
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return (gzFile)s;
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}
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/* ===========================================================================
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Opens a gzip (.gz) file for reading or writing.
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*/
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gzFile ZEXPORT gzopen (path, mode)
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const char *path;
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const char *mode;
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{
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return gz_open (path, mode, -1);
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}
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/* ===========================================================================
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Associate a gzFile with the file descriptor fd. fd is not dup'ed here
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to mimic the behavio(u)r of fdopen.
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*/
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gzFile ZEXPORT gzdopen (fd, mode)
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int fd;
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const char *mode;
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{
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char name[46]; /* allow for up to 128-bit integers */
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if (fd < 0) return (gzFile)Z_NULL;
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sprintf(name, "<fd:%d>", fd); /* for debugging */
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return gz_open (name, mode, fd);
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}
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/* ===========================================================================
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* Update the compression level and strategy
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*/
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int ZEXPORT gzsetparams (file, level, strategy)
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gzFile file;
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int level;
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int strategy;
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{
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gz_stream *s = (gz_stream*)file;
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if (s == NULL || s->mode != 'w') return Z_STREAM_ERROR;
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/* Make room to allow flushing */
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if (s->stream.avail_out == 0) {
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s->stream.next_out = s->outbuf;
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if (fwrite(s->outbuf, 1, Z_BUFSIZE, s->file) != Z_BUFSIZE) {
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s->z_err = Z_ERRNO;
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}
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s->stream.avail_out = Z_BUFSIZE;
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}
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return deflateParams (&(s->stream), level, strategy);
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}
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/* ===========================================================================
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Read a byte from a gz_stream; update next_in and avail_in. Return EOF
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for end of file.
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IN assertion: the stream s has been sucessfully opened for reading.
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*/
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local int get_byte(s)
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gz_stream *s;
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{
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if (s->z_eof) return EOF;
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if (s->stream.avail_in == 0) {
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errno = 0;
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s->stream.avail_in = (uInt)fread(s->inbuf, 1, Z_BUFSIZE, s->file);
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if (s->stream.avail_in == 0) {
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s->z_eof = 1;
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if (ferror(s->file)) s->z_err = Z_ERRNO;
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return EOF;
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}
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s->stream.next_in = s->inbuf;
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}
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s->stream.avail_in--;
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return *(s->stream.next_in)++;
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}
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/* ===========================================================================
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Check the gzip header of a gz_stream opened for reading. Set the stream
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mode to transparent if the gzip magic header is not present; set s->err
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to Z_DATA_ERROR if the magic header is present but the rest of the header
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is incorrect.
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IN assertion: the stream s has already been created sucessfully;
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s->stream.avail_in is zero for the first time, but may be non-zero
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for concatenated .gz files.
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*/
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local void check_header(s)
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gz_stream *s;
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{
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int method; /* method byte */
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int flags; /* flags byte */
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uInt len;
|
294 |
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int c;
|
295 |
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296 |
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/* Assure two bytes in the buffer so we can peek ahead -- handle case
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where first byte of header is at the end of the buffer after the last
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gzip segment */
|
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len = s->stream.avail_in;
|
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if (len < 2) {
|
301 |
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if (len) s->inbuf[0] = s->stream.next_in[0];
|
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errno = 0;
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len = (uInt)fread(s->inbuf + len, 1, Z_BUFSIZE >> len, s->file);
|
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if (len == 0 && ferror(s->file)) s->z_err = Z_ERRNO;
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s->stream.avail_in += len;
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s->stream.next_in = s->inbuf;
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if (s->stream.avail_in < 2) {
|
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s->transparent = s->stream.avail_in;
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return;
|
310 |
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}
|
311 |
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}
|
312 |
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|
313 |
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/* Peek ahead to check the gzip magic header */
|
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if (s->stream.next_in[0] != gz_magic[0] ||
|
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s->stream.next_in[1] != gz_magic[1]) {
|
316 |
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s->transparent = 1;
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return;
|
318 |
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}
|
319 |
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s->stream.avail_in -= 2;
|
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s->stream.next_in += 2;
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|
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/* Check the rest of the gzip header */
|
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method = get_byte(s);
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flags = get_byte(s);
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325 |
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if (method != Z_DEFLATED || (flags & RESERVED) != 0) {
|
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s->z_err = Z_DATA_ERROR;
|
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return;
|
328 |
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}
|
329 |
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|
330 |
|
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/* Discard time, xflags and OS code: */
|
331 |
|
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for (len = 0; len < 6; len++) (void)get_byte(s);
|
332 |
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|
333 |
|
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if ((flags & EXTRA_FIELD) != 0) { /* skip the extra field */
|
334 |
|
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len = (uInt)get_byte(s);
|
335 |
|
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len += ((uInt)get_byte(s))<<8;
|
336 |
|
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/* len is garbage if EOF but the loop below will quit anyway */
|
337 |
|
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while (len-- != 0 && get_byte(s) != EOF) ;
|
338 |
|
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}
|
339 |
|
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if ((flags & ORIG_NAME) != 0) { /* skip the original file name */
|
340 |
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while ((c = get_byte(s)) != 0 && c != EOF) ;
|
341 |
|
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}
|
342 |
|
|
if ((flags & COMMENT) != 0) { /* skip the .gz file comment */
|
343 |
|
|
while ((c = get_byte(s)) != 0 && c != EOF) ;
|
344 |
|
|
}
|
345 |
|
|
if ((flags & HEAD_CRC) != 0) { /* skip the header crc */
|
346 |
|
|
for (len = 0; len < 2; len++) (void)get_byte(s);
|
347 |
|
|
}
|
348 |
|
|
s->z_err = s->z_eof ? Z_DATA_ERROR : Z_OK;
|
349 |
|
|
}
|
350 |
|
|
|
351 |
|
|
/* ===========================================================================
|
352 |
|
|
* Cleanup then free the given gz_stream. Return a zlib error code.
|
353 |
|
|
Try freeing in the reverse order of allocations.
|
354 |
|
|
*/
|
355 |
|
|
local int destroy (s)
|
356 |
|
|
gz_stream *s;
|
357 |
|
|
{
|
358 |
|
|
int err = Z_OK;
|
359 |
|
|
|
360 |
|
|
if (!s) return Z_STREAM_ERROR;
|
361 |
|
|
|
362 |
|
|
TRYFREE(s->msg);
|
363 |
|
|
|
364 |
|
|
if (s->stream.state != NULL) {
|
365 |
|
|
if (s->mode == 'w') {
|
366 |
|
|
#ifdef NO_GZCOMPRESS
|
367 |
|
|
err = Z_STREAM_ERROR;
|
368 |
|
|
#else
|
369 |
|
|
err = deflateEnd(&(s->stream));
|
370 |
|
|
#endif
|
371 |
|
|
} else if (s->mode == 'r') {
|
372 |
|
|
err = inflateEnd(&(s->stream));
|
373 |
|
|
}
|
374 |
|
|
}
|
375 |
|
|
if (s->file != NULL && fclose(s->file)) {
|
376 |
|
|
#ifdef ESPIPE
|
377 |
|
|
if (errno != ESPIPE) /* fclose is broken for pipes in HP/UX */
|
378 |
|
|
#endif
|
379 |
|
|
err = Z_ERRNO;
|
380 |
|
|
}
|
381 |
|
|
if (s->z_err < 0) err = s->z_err;
|
382 |
|
|
|
383 |
|
|
TRYFREE(s->inbuf);
|
384 |
|
|
TRYFREE(s->outbuf);
|
385 |
|
|
TRYFREE(s->path);
|
386 |
|
|
TRYFREE(s);
|
387 |
|
|
return err;
|
388 |
|
|
}
|
389 |
|
|
|
390 |
|
|
/* ===========================================================================
|
391 |
|
|
Reads the given number of uncompressed bytes from the compressed file.
|
392 |
|
|
gzread returns the number of bytes actually read (0 for end of file).
|
393 |
|
|
*/
|
394 |
|
|
int ZEXPORT gzread (file, buf, len)
|
395 |
|
|
gzFile file;
|
396 |
|
|
voidp buf;
|
397 |
|
|
unsigned len;
|
398 |
|
|
{
|
399 |
|
|
gz_stream *s = (gz_stream*)file;
|
400 |
|
|
Bytef *start = (Bytef*)buf; /* starting point for crc computation */
|
401 |
|
|
Byte *next_out; /* == stream.next_out but not forced far (for MSDOS) */
|
402 |
|
|
|
403 |
|
|
if (s == NULL || s->mode != 'r') return Z_STREAM_ERROR;
|
404 |
|
|
|
405 |
|
|
if (s->z_err == Z_DATA_ERROR || s->z_err == Z_ERRNO) return -1;
|
406 |
|
|
if (s->z_err == Z_STREAM_END) return 0; /* EOF */
|
407 |
|
|
|
408 |
|
|
next_out = (Byte*)buf;
|
409 |
|
|
s->stream.next_out = (Bytef*)buf;
|
410 |
|
|
s->stream.avail_out = len;
|
411 |
|
|
|
412 |
|
|
if (s->stream.avail_out && s->back != EOF) {
|
413 |
|
|
*next_out++ = s->back;
|
414 |
|
|
s->stream.next_out++;
|
415 |
|
|
s->stream.avail_out--;
|
416 |
|
|
s->back = EOF;
|
417 |
|
|
s->out++;
|
418 |
|
|
start++;
|
419 |
|
|
if (s->last) {
|
420 |
|
|
s->z_err = Z_STREAM_END;
|
421 |
|
|
return 1;
|
422 |
|
|
}
|
423 |
|
|
}
|
424 |
|
|
|
425 |
|
|
while (s->stream.avail_out != 0) {
|
426 |
|
|
|
427 |
|
|
if (s->transparent) {
|
428 |
|
|
/* Copy first the lookahead bytes: */
|
429 |
|
|
uInt n = s->stream.avail_in;
|
430 |
|
|
if (n > s->stream.avail_out) n = s->stream.avail_out;
|
431 |
|
|
if (n > 0) {
|
432 |
|
|
zmemcpy(s->stream.next_out, s->stream.next_in, n);
|
433 |
|
|
next_out += n;
|
434 |
|
|
s->stream.next_out = next_out;
|
435 |
|
|
s->stream.next_in += n;
|
436 |
|
|
s->stream.avail_out -= n;
|
437 |
|
|
s->stream.avail_in -= n;
|
438 |
|
|
}
|
439 |
|
|
if (s->stream.avail_out > 0) {
|
440 |
|
|
s->stream.avail_out -=
|
441 |
|
|
(uInt)fread(next_out, 1, s->stream.avail_out, s->file);
|
442 |
|
|
}
|
443 |
|
|
len -= s->stream.avail_out;
|
444 |
|
|
s->in += len;
|
445 |
|
|
s->out += len;
|
446 |
|
|
if (len == 0) s->z_eof = 1;
|
447 |
|
|
return (int)len;
|
448 |
|
|
}
|
449 |
|
|
if (s->stream.avail_in == 0 && !s->z_eof) {
|
450 |
|
|
|
451 |
|
|
errno = 0;
|
452 |
|
|
s->stream.avail_in = (uInt)fread(s->inbuf, 1, Z_BUFSIZE, s->file);
|
453 |
|
|
if (s->stream.avail_in == 0) {
|
454 |
|
|
s->z_eof = 1;
|
455 |
|
|
if (ferror(s->file)) {
|
456 |
|
|
s->z_err = Z_ERRNO;
|
457 |
|
|
break;
|
458 |
|
|
}
|
459 |
|
|
}
|
460 |
|
|
s->stream.next_in = s->inbuf;
|
461 |
|
|
}
|
462 |
|
|
s->in += s->stream.avail_in;
|
463 |
|
|
s->out += s->stream.avail_out;
|
464 |
|
|
s->z_err = inflate(&(s->stream), Z_NO_FLUSH);
|
465 |
|
|
s->in -= s->stream.avail_in;
|
466 |
|
|
s->out -= s->stream.avail_out;
|
467 |
|
|
|
468 |
|
|
if (s->z_err == Z_STREAM_END) {
|
469 |
|
|
/* Check CRC and original size */
|
470 |
|
|
s->crc = crc32(s->crc, start, (uInt)(s->stream.next_out - start));
|
471 |
|
|
start = s->stream.next_out;
|
472 |
|
|
|
473 |
|
|
if (getLong(s) != s->crc) {
|
474 |
|
|
s->z_err = Z_DATA_ERROR;
|
475 |
|
|
} else {
|
476 |
|
|
(void)getLong(s);
|
477 |
|
|
/* The uncompressed length returned by above getlong() may be
|
478 |
|
|
* different from s->out in case of concatenated .gz files.
|
479 |
|
|
* Check for such files:
|
480 |
|
|
*/
|
481 |
|
|
check_header(s);
|
482 |
|
|
if (s->z_err == Z_OK) {
|
483 |
|
|
inflateReset(&(s->stream));
|
484 |
|
|
s->crc = crc32(0L, Z_NULL, 0);
|
485 |
|
|
}
|
486 |
|
|
}
|
487 |
|
|
}
|
488 |
|
|
if (s->z_err != Z_OK || s->z_eof) break;
|
489 |
|
|
}
|
490 |
|
|
s->crc = crc32(s->crc, start, (uInt)(s->stream.next_out - start));
|
491 |
|
|
|
492 |
|
|
if (len == s->stream.avail_out &&
|
493 |
|
|
(s->z_err == Z_DATA_ERROR || s->z_err == Z_ERRNO))
|
494 |
|
|
return -1;
|
495 |
|
|
return (int)(len - s->stream.avail_out);
|
496 |
|
|
}
|
497 |
|
|
|
498 |
|
|
|
499 |
|
|
/* ===========================================================================
|
500 |
|
|
Reads one byte from the compressed file. gzgetc returns this byte
|
501 |
|
|
or -1 in case of end of file or error.
|
502 |
|
|
*/
|
503 |
|
|
int ZEXPORT gzgetc(file)
|
504 |
|
|
gzFile file;
|
505 |
|
|
{
|
506 |
|
|
unsigned char c;
|
507 |
|
|
|
508 |
|
|
return gzread(file, &c, 1) == 1 ? c : -1;
|
509 |
|
|
}
|
510 |
|
|
|
511 |
|
|
|
512 |
|
|
/* ===========================================================================
|
513 |
|
|
Push one byte back onto the stream.
|
514 |
|
|
*/
|
515 |
|
|
int ZEXPORT gzungetc(c, file)
|
516 |
|
|
int c;
|
517 |
|
|
gzFile file;
|
518 |
|
|
{
|
519 |
|
|
gz_stream *s = (gz_stream*)file;
|
520 |
|
|
|
521 |
|
|
if (s == NULL || s->mode != 'r' || c == EOF || s->back != EOF) return EOF;
|
522 |
|
|
s->back = c;
|
523 |
|
|
s->out--;
|
524 |
|
|
s->last = (s->z_err == Z_STREAM_END);
|
525 |
|
|
if (s->last) s->z_err = Z_OK;
|
526 |
|
|
s->z_eof = 0;
|
527 |
|
|
return c;
|
528 |
|
|
}
|
529 |
|
|
|
530 |
|
|
|
531 |
|
|
/* ===========================================================================
|
532 |
|
|
Reads bytes from the compressed file until len-1 characters are
|
533 |
|
|
read, or a newline character is read and transferred to buf, or an
|
534 |
|
|
end-of-file condition is encountered. The string is then terminated
|
535 |
|
|
with a null character.
|
536 |
|
|
gzgets returns buf, or Z_NULL in case of error.
|
537 |
|
|
|
538 |
|
|
The current implementation is not optimized at all.
|
539 |
|
|
*/
|
540 |
|
|
char * ZEXPORT gzgets(file, buf, len)
|
541 |
|
|
gzFile file;
|
542 |
|
|
char *buf;
|
543 |
|
|
int len;
|
544 |
|
|
{
|
545 |
|
|
char *b = buf;
|
546 |
|
|
if (buf == Z_NULL || len <= 0) return Z_NULL;
|
547 |
|
|
|
548 |
|
|
while (--len > 0 && gzread(file, buf, 1) == 1 && *buf++ != '\n') ;
|
549 |
|
|
*buf = '\0';
|
550 |
|
|
return b == buf && len > 0 ? Z_NULL : b;
|
551 |
|
|
}
|
552 |
|
|
|
553 |
|
|
|
554 |
|
|
#ifndef NO_GZCOMPRESS
|
555 |
|
|
/* ===========================================================================
|
556 |
|
|
Writes the given number of uncompressed bytes into the compressed file.
|
557 |
|
|
gzwrite returns the number of bytes actually written (0 in case of error).
|
558 |
|
|
*/
|
559 |
|
|
int ZEXPORT gzwrite (file, buf, len)
|
560 |
|
|
gzFile file;
|
561 |
|
|
voidpc buf;
|
562 |
|
|
unsigned len;
|
563 |
|
|
{
|
564 |
|
|
gz_stream *s = (gz_stream*)file;
|
565 |
|
|
|
566 |
|
|
if (s == NULL || s->mode != 'w') return Z_STREAM_ERROR;
|
567 |
|
|
|
568 |
|
|
s->stream.next_in = (Bytef*)buf;
|
569 |
|
|
s->stream.avail_in = len;
|
570 |
|
|
|
571 |
|
|
while (s->stream.avail_in != 0) {
|
572 |
|
|
|
573 |
|
|
if (s->stream.avail_out == 0) {
|
574 |
|
|
|
575 |
|
|
s->stream.next_out = s->outbuf;
|
576 |
|
|
if (fwrite(s->outbuf, 1, Z_BUFSIZE, s->file) != Z_BUFSIZE) {
|
577 |
|
|
s->z_err = Z_ERRNO;
|
578 |
|
|
break;
|
579 |
|
|
}
|
580 |
|
|
s->stream.avail_out = Z_BUFSIZE;
|
581 |
|
|
}
|
582 |
|
|
s->in += s->stream.avail_in;
|
583 |
|
|
s->out += s->stream.avail_out;
|
584 |
|
|
s->z_err = deflate(&(s->stream), Z_NO_FLUSH);
|
585 |
|
|
s->in -= s->stream.avail_in;
|
586 |
|
|
s->out -= s->stream.avail_out;
|
587 |
|
|
if (s->z_err != Z_OK) break;
|
588 |
|
|
}
|
589 |
|
|
s->crc = crc32(s->crc, (const Bytef *)buf, len);
|
590 |
|
|
|
591 |
|
|
return (int)(len - s->stream.avail_in);
|
592 |
|
|
}
|
593 |
|
|
|
594 |
|
|
|
595 |
|
|
/* ===========================================================================
|
596 |
|
|
Converts, formats, and writes the args to the compressed file under
|
597 |
|
|
control of the format string, as in fprintf. gzprintf returns the number of
|
598 |
|
|
uncompressed bytes actually written (0 in case of error).
|
599 |
|
|
*/
|
600 |
|
|
#ifdef STDC
|
601 |
|
|
#include <stdarg.h>
|
602 |
|
|
|
603 |
|
|
int ZEXPORTVA gzprintf (gzFile file, const char *format, /* args */ ...)
|
604 |
|
|
{
|
605 |
|
|
char buf[Z_PRINTF_BUFSIZE];
|
606 |
|
|
va_list va;
|
607 |
|
|
int len;
|
608 |
|
|
|
609 |
|
|
buf[sizeof(buf) - 1] = 0;
|
610 |
|
|
va_start(va, format);
|
611 |
|
|
#ifdef NO_vsnprintf
|
612 |
|
|
# ifdef HAS_vsprintf_void
|
613 |
|
|
(void)vsprintf(buf, format, va);
|
614 |
|
|
va_end(va);
|
615 |
|
|
for (len = 0; len < sizeof(buf); len++)
|
616 |
|
|
if (buf[len] == 0) break;
|
617 |
|
|
# else
|
618 |
|
|
len = vsprintf(buf, format, va);
|
619 |
|
|
va_end(va);
|
620 |
|
|
# endif
|
621 |
|
|
#else
|
622 |
|
|
# ifdef HAS_vsnprintf_void
|
623 |
|
|
(void)vsnprintf(buf, sizeof(buf), format, va);
|
624 |
|
|
va_end(va);
|
625 |
|
|
len = strlen(buf);
|
626 |
|
|
# else
|
627 |
|
|
len = vsnprintf(buf, sizeof(buf), format, va);
|
628 |
|
|
va_end(va);
|
629 |
|
|
# endif
|
630 |
|
|
#endif
|
631 |
|
|
if (len <= 0 || len >= (int)sizeof(buf) || buf[sizeof(buf) - 1] != 0)
|
632 |
|
|
return 0;
|
633 |
|
|
return gzwrite(file, buf, (unsigned)len);
|
634 |
|
|
}
|
635 |
|
|
#else /* not ANSI C */
|
636 |
|
|
|
637 |
|
|
int ZEXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
|
638 |
|
|
a11, a12, a13, a14, a15, a16, a17, a18, a19, a20)
|
639 |
|
|
gzFile file;
|
640 |
|
|
const char *format;
|
641 |
|
|
int a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
|
642 |
|
|
a11, a12, a13, a14, a15, a16, a17, a18, a19, a20;
|
643 |
|
|
{
|
644 |
|
|
char buf[Z_PRINTF_BUFSIZE];
|
645 |
|
|
int len;
|
646 |
|
|
|
647 |
|
|
buf[sizeof(buf) - 1] = 0;
|
648 |
|
|
#ifdef NO_snprintf
|
649 |
|
|
# ifdef HAS_sprintf_void
|
650 |
|
|
sprintf(buf, format, a1, a2, a3, a4, a5, a6, a7, a8,
|
651 |
|
|
a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
|
652 |
|
|
for (len = 0; len < sizeof(buf); len++)
|
653 |
|
|
if (buf[len] == 0) break;
|
654 |
|
|
# else
|
655 |
|
|
len = sprintf(buf, format, a1, a2, a3, a4, a5, a6, a7, a8,
|
656 |
|
|
a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
|
657 |
|
|
# endif
|
658 |
|
|
#else
|
659 |
|
|
# ifdef HAS_snprintf_void
|
660 |
|
|
snprintf(buf, sizeof(buf), format, a1, a2, a3, a4, a5, a6, a7, a8,
|
661 |
|
|
a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
|
662 |
|
|
len = strlen(buf);
|
663 |
|
|
# else
|
664 |
|
|
len = snprintf(buf, sizeof(buf), format, a1, a2, a3, a4, a5, a6, a7, a8,
|
665 |
|
|
a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
|
666 |
|
|
# endif
|
667 |
|
|
#endif
|
668 |
|
|
if (len <= 0 || len >= sizeof(buf) || buf[sizeof(buf) - 1] != 0)
|
669 |
|
|
return 0;
|
670 |
|
|
return gzwrite(file, buf, len);
|
671 |
|
|
}
|
672 |
|
|
#endif
|
673 |
|
|
|
674 |
|
|
/* ===========================================================================
|
675 |
|
|
Writes c, converted to an unsigned char, into the compressed file.
|
676 |
|
|
gzputc returns the value that was written, or -1 in case of error.
|
677 |
|
|
*/
|
678 |
|
|
int ZEXPORT gzputc(file, c)
|
679 |
|
|
gzFile file;
|
680 |
|
|
int c;
|
681 |
|
|
{
|
682 |
|
|
unsigned char cc = (unsigned char) c; /* required for big endian systems */
|
683 |
|
|
|
684 |
|
|
return gzwrite(file, &cc, 1) == 1 ? (int)cc : -1;
|
685 |
|
|
}
|
686 |
|
|
|
687 |
|
|
|
688 |
|
|
/* ===========================================================================
|
689 |
|
|
Writes the given null-terminated string to the compressed file, excluding
|
690 |
|
|
the terminating null character.
|
691 |
|
|
gzputs returns the number of characters written, or -1 in case of error.
|
692 |
|
|
*/
|
693 |
|
|
int ZEXPORT gzputs(file, s)
|
694 |
|
|
gzFile file;
|
695 |
|
|
const char *s;
|
696 |
|
|
{
|
697 |
|
|
return gzwrite(file, (char*)s, (unsigned)strlen(s));
|
698 |
|
|
}
|
699 |
|
|
|
700 |
|
|
|
701 |
|
|
/* ===========================================================================
|
702 |
|
|
Flushes all pending output into the compressed file. The parameter
|
703 |
|
|
flush is as in the deflate() function.
|
704 |
|
|
*/
|
705 |
|
|
local int do_flush (file, flush)
|
706 |
|
|
gzFile file;
|
707 |
|
|
int flush;
|
708 |
|
|
{
|
709 |
|
|
uInt len;
|
710 |
|
|
int done = 0;
|
711 |
|
|
gz_stream *s = (gz_stream*)file;
|
712 |
|
|
|
713 |
|
|
if (s == NULL || s->mode != 'w') return Z_STREAM_ERROR;
|
714 |
|
|
|
715 |
|
|
s->stream.avail_in = 0; /* should be zero already anyway */
|
716 |
|
|
|
717 |
|
|
for (;;) {
|
718 |
|
|
len = Z_BUFSIZE - s->stream.avail_out;
|
719 |
|
|
|
720 |
|
|
if (len != 0) {
|
721 |
|
|
if ((uInt)fwrite(s->outbuf, 1, len, s->file) != len) {
|
722 |
|
|
s->z_err = Z_ERRNO;
|
723 |
|
|
return Z_ERRNO;
|
724 |
|
|
}
|
725 |
|
|
s->stream.next_out = s->outbuf;
|
726 |
|
|
s->stream.avail_out = Z_BUFSIZE;
|
727 |
|
|
}
|
728 |
|
|
if (done) break;
|
729 |
|
|
s->out += s->stream.avail_out;
|
730 |
|
|
s->z_err = deflate(&(s->stream), flush);
|
731 |
|
|
s->out -= s->stream.avail_out;
|
732 |
|
|
|
733 |
|
|
/* Ignore the second of two consecutive flushes: */
|
734 |
|
|
if (len == 0 && s->z_err == Z_BUF_ERROR) s->z_err = Z_OK;
|
735 |
|
|
|
736 |
|
|
/* deflate has finished flushing only when it hasn't used up
|
737 |
|
|
* all the available space in the output buffer:
|
738 |
|
|
*/
|
739 |
|
|
done = (s->stream.avail_out != 0 || s->z_err == Z_STREAM_END);
|
740 |
|
|
|
741 |
|
|
if (s->z_err != Z_OK && s->z_err != Z_STREAM_END) break;
|
742 |
|
|
}
|
743 |
|
|
return s->z_err == Z_STREAM_END ? Z_OK : s->z_err;
|
744 |
|
|
}
|
745 |
|
|
|
746 |
|
|
int ZEXPORT gzflush (file, flush)
|
747 |
|
|
gzFile file;
|
748 |
|
|
int flush;
|
749 |
|
|
{
|
750 |
|
|
gz_stream *s = (gz_stream*)file;
|
751 |
|
|
int err = do_flush (file, flush);
|
752 |
|
|
|
753 |
|
|
if (err) return err;
|
754 |
|
|
fflush(s->file);
|
755 |
|
|
return s->z_err == Z_STREAM_END ? Z_OK : s->z_err;
|
756 |
|
|
}
|
757 |
|
|
#endif /* NO_GZCOMPRESS */
|
758 |
|
|
|
759 |
|
|
/* ===========================================================================
|
760 |
|
|
Sets the starting position for the next gzread or gzwrite on the given
|
761 |
|
|
compressed file. The offset represents a number of bytes in the
|
762 |
|
|
gzseek returns the resulting offset location as measured in bytes from
|
763 |
|
|
the beginning of the uncompressed stream, or -1 in case of error.
|
764 |
|
|
SEEK_END is not implemented, returns error.
|
765 |
|
|
In this version of the library, gzseek can be extremely slow.
|
766 |
|
|
*/
|
767 |
|
|
z_off_t ZEXPORT gzseek (file, offset, whence)
|
768 |
|
|
gzFile file;
|
769 |
|
|
z_off_t offset;
|
770 |
|
|
int whence;
|
771 |
|
|
{
|
772 |
|
|
gz_stream *s = (gz_stream*)file;
|
773 |
|
|
|
774 |
|
|
if (s == NULL || whence == SEEK_END ||
|
775 |
|
|
s->z_err == Z_ERRNO || s->z_err == Z_DATA_ERROR) {
|
776 |
|
|
return -1L;
|
777 |
|
|
}
|
778 |
|
|
|
779 |
|
|
if (s->mode == 'w') {
|
780 |
|
|
#ifdef NO_GZCOMPRESS
|
781 |
|
|
return -1L;
|
782 |
|
|
#else
|
783 |
|
|
if (whence == SEEK_SET) {
|
784 |
|
|
offset -= s->in;
|
785 |
|
|
}
|
786 |
|
|
if (offset < 0) return -1L;
|
787 |
|
|
|
788 |
|
|
/* At this point, offset is the number of zero bytes to write. */
|
789 |
|
|
if (s->inbuf == Z_NULL) {
|
790 |
|
|
s->inbuf = (Byte*)ALLOC(Z_BUFSIZE); /* for seeking */
|
791 |
|
|
if (s->inbuf == Z_NULL) return -1L;
|
792 |
|
|
zmemzero(s->inbuf, Z_BUFSIZE);
|
793 |
|
|
}
|
794 |
|
|
while (offset > 0) {
|
795 |
|
|
uInt size = Z_BUFSIZE;
|
796 |
|
|
if (offset < Z_BUFSIZE) size = (uInt)offset;
|
797 |
|
|
|
798 |
|
|
size = gzwrite(file, s->inbuf, size);
|
799 |
|
|
if (size == 0) return -1L;
|
800 |
|
|
|
801 |
|
|
offset -= size;
|
802 |
|
|
}
|
803 |
|
|
return s->in;
|
804 |
|
|
#endif
|
805 |
|
|
}
|
806 |
|
|
/* Rest of function is for reading only */
|
807 |
|
|
|
808 |
|
|
/* compute absolute position */
|
809 |
|
|
if (whence == SEEK_CUR) {
|
810 |
|
|
offset += s->out;
|
811 |
|
|
}
|
812 |
|
|
if (offset < 0) return -1L;
|
813 |
|
|
|
814 |
|
|
if (s->transparent) {
|
815 |
|
|
/* map to fseek */
|
816 |
|
|
s->back = EOF;
|
817 |
|
|
s->stream.avail_in = 0;
|
818 |
|
|
s->stream.next_in = s->inbuf;
|
819 |
|
|
if (fseek(s->file, offset, SEEK_SET) < 0) return -1L;
|
820 |
|
|
|
821 |
|
|
s->in = s->out = offset;
|
822 |
|
|
return offset;
|
823 |
|
|
}
|
824 |
|
|
|
825 |
|
|
/* For a negative seek, rewind and use positive seek */
|
826 |
|
|
if (offset >= s->out) {
|
827 |
|
|
offset -= s->out;
|
828 |
|
|
} else if (gzrewind(file) < 0) {
|
829 |
|
|
return -1L;
|
830 |
|
|
}
|
831 |
|
|
/* offset is now the number of bytes to skip. */
|
832 |
|
|
|
833 |
|
|
if (offset != 0 && s->outbuf == Z_NULL) {
|
834 |
|
|
s->outbuf = (Byte*)ALLOC(Z_BUFSIZE);
|
835 |
|
|
if (s->outbuf == Z_NULL) return -1L;
|
836 |
|
|
}
|
837 |
|
|
if (offset && s->back != EOF) {
|
838 |
|
|
s->back = EOF;
|
839 |
|
|
s->out++;
|
840 |
|
|
offset--;
|
841 |
|
|
if (s->last) s->z_err = Z_STREAM_END;
|
842 |
|
|
}
|
843 |
|
|
while (offset > 0) {
|
844 |
|
|
int size = Z_BUFSIZE;
|
845 |
|
|
if (offset < Z_BUFSIZE) size = (int)offset;
|
846 |
|
|
|
847 |
|
|
size = gzread(file, s->outbuf, (uInt)size);
|
848 |
|
|
if (size <= 0) return -1L;
|
849 |
|
|
offset -= size;
|
850 |
|
|
}
|
851 |
|
|
return s->out;
|
852 |
|
|
}
|
853 |
|
|
|
854 |
|
|
/* ===========================================================================
|
855 |
|
|
Rewinds input file.
|
856 |
|
|
*/
|
857 |
|
|
int ZEXPORT gzrewind (file)
|
858 |
|
|
gzFile file;
|
859 |
|
|
{
|
860 |
|
|
gz_stream *s = (gz_stream*)file;
|
861 |
|
|
|
862 |
|
|
if (s == NULL || s->mode != 'r') return -1;
|
863 |
|
|
|
864 |
|
|
s->z_err = Z_OK;
|
865 |
|
|
s->z_eof = 0;
|
866 |
|
|
s->back = EOF;
|
867 |
|
|
s->stream.avail_in = 0;
|
868 |
|
|
s->stream.next_in = s->inbuf;
|
869 |
|
|
s->crc = crc32(0L, Z_NULL, 0);
|
870 |
|
|
if (!s->transparent) (void)inflateReset(&s->stream);
|
871 |
|
|
s->in = 0;
|
872 |
|
|
s->out = 0;
|
873 |
|
|
return fseek(s->file, s->start, SEEK_SET);
|
874 |
|
|
}
|
875 |
|
|
|
876 |
|
|
/* ===========================================================================
|
877 |
|
|
Returns the starting position for the next gzread or gzwrite on the
|
878 |
|
|
given compressed file. This position represents a number of bytes in the
|
879 |
|
|
uncompressed data stream.
|
880 |
|
|
*/
|
881 |
|
|
z_off_t ZEXPORT gztell (file)
|
882 |
|
|
gzFile file;
|
883 |
|
|
{
|
884 |
|
|
return gzseek(file, 0L, SEEK_CUR);
|
885 |
|
|
}
|
886 |
|
|
|
887 |
|
|
/* ===========================================================================
|
888 |
|
|
Returns 1 when EOF has previously been detected reading the given
|
889 |
|
|
input stream, otherwise zero.
|
890 |
|
|
*/
|
891 |
|
|
int ZEXPORT gzeof (file)
|
892 |
|
|
gzFile file;
|
893 |
|
|
{
|
894 |
|
|
gz_stream *s = (gz_stream*)file;
|
895 |
|
|
|
896 |
|
|
/* With concatenated compressed files that can have embedded
|
897 |
|
|
* crc trailers, z_eof is no longer the only/best indicator of EOF
|
898 |
|
|
* on a gz_stream. Handle end-of-stream error explicitly here.
|
899 |
|
|
*/
|
900 |
|
|
if (s == NULL || s->mode != 'r') return 0;
|
901 |
|
|
if (s->z_eof) return 1;
|
902 |
|
|
return s->z_err == Z_STREAM_END;
|
903 |
|
|
}
|
904 |
|
|
|
905 |
|
|
/* ===========================================================================
|
906 |
|
|
Returns 1 if reading and doing so transparently, otherwise zero.
|
907 |
|
|
*/
|
908 |
|
|
int ZEXPORT gzdirect (file)
|
909 |
|
|
gzFile file;
|
910 |
|
|
{
|
911 |
|
|
gz_stream *s = (gz_stream*)file;
|
912 |
|
|
|
913 |
|
|
if (s == NULL || s->mode != 'r') return 0;
|
914 |
|
|
return s->transparent;
|
915 |
|
|
}
|
916 |
|
|
|
917 |
|
|
/* ===========================================================================
|
918 |
|
|
Outputs a long in LSB order to the given file
|
919 |
|
|
*/
|
920 |
|
|
local void putLong (file, x)
|
921 |
|
|
FILE *file;
|
922 |
|
|
uLong x;
|
923 |
|
|
{
|
924 |
|
|
int n;
|
925 |
|
|
for (n = 0; n < 4; n++) {
|
926 |
|
|
fputc((int)(x & 0xff), file);
|
927 |
|
|
x >>= 8;
|
928 |
|
|
}
|
929 |
|
|
}
|
930 |
|
|
|
931 |
|
|
/* ===========================================================================
|
932 |
|
|
Reads a long in LSB order from the given gz_stream. Sets z_err in case
|
933 |
|
|
of error.
|
934 |
|
|
*/
|
935 |
|
|
local uLong getLong (s)
|
936 |
|
|
gz_stream *s;
|
937 |
|
|
{
|
938 |
|
|
uLong x = (uLong)get_byte(s);
|
939 |
|
|
int c;
|
940 |
|
|
|
941 |
|
|
x += ((uLong)get_byte(s))<<8;
|
942 |
|
|
x += ((uLong)get_byte(s))<<16;
|
943 |
|
|
c = get_byte(s);
|
944 |
|
|
if (c == EOF) s->z_err = Z_DATA_ERROR;
|
945 |
|
|
x += ((uLong)c)<<24;
|
946 |
|
|
return x;
|
947 |
|
|
}
|
948 |
|
|
|
949 |
|
|
/* ===========================================================================
|
950 |
|
|
Flushes all pending output if necessary, closes the compressed file
|
951 |
|
|
and deallocates all the (de)compression state.
|
952 |
|
|
*/
|
953 |
|
|
int ZEXPORT gzclose (file)
|
954 |
|
|
gzFile file;
|
955 |
|
|
{
|
956 |
|
|
gz_stream *s = (gz_stream*)file;
|
957 |
|
|
|
958 |
|
|
if (s == NULL) return Z_STREAM_ERROR;
|
959 |
|
|
|
960 |
|
|
if (s->mode == 'w') {
|
961 |
|
|
#ifdef NO_GZCOMPRESS
|
962 |
|
|
return Z_STREAM_ERROR;
|
963 |
|
|
#else
|
964 |
|
|
if (do_flush (file, Z_FINISH) != Z_OK)
|
965 |
|
|
return destroy((gz_stream*)file);
|
966 |
|
|
|
967 |
|
|
putLong (s->file, s->crc);
|
968 |
|
|
putLong (s->file, (uLong)(s->in & 0xffffffff));
|
969 |
|
|
#endif
|
970 |
|
|
}
|
971 |
|
|
return destroy((gz_stream*)file);
|
972 |
|
|
}
|
973 |
|
|
|
974 |
|
|
#ifdef STDC
|
975 |
|
|
# define zstrerror(errnum) strerror(errnum)
|
976 |
|
|
#else
|
977 |
|
|
# define zstrerror(errnum) ""
|
978 |
|
|
#endif
|
979 |
|
|
|
980 |
|
|
/* ===========================================================================
|
981 |
|
|
Returns the error message for the last error which occurred on the
|
982 |
|
|
given compressed file. errnum is set to zlib error number. If an
|
983 |
|
|
error occurred in the file system and not in the compression library,
|
984 |
|
|
errnum is set to Z_ERRNO and the application may consult errno
|
985 |
|
|
to get the exact error code.
|
986 |
|
|
*/
|
987 |
|
|
const char * ZEXPORT gzerror (file, errnum)
|
988 |
|
|
gzFile file;
|
989 |
|
|
int *errnum;
|
990 |
|
|
{
|
991 |
|
|
char *m;
|
992 |
|
|
gz_stream *s = (gz_stream*)file;
|
993 |
|
|
|
994 |
|
|
if (s == NULL) {
|
995 |
|
|
*errnum = Z_STREAM_ERROR;
|
996 |
|
|
return (const char*)ERR_MSG(Z_STREAM_ERROR);
|
997 |
|
|
}
|
998 |
|
|
*errnum = s->z_err;
|
999 |
|
|
if (*errnum == Z_OK) return (const char*)"";
|
1000 |
|
|
|
1001 |
|
|
m = (char*)(*errnum == Z_ERRNO ? zstrerror(errno) : s->stream.msg);
|
1002 |
|
|
|
1003 |
|
|
if (m == NULL || *m == '\0') m = (char*)ERR_MSG(s->z_err);
|
1004 |
|
|
|
1005 |
|
|
TRYFREE(s->msg);
|
1006 |
|
|
s->msg = (char*)ALLOC(strlen(s->path) + strlen(m) + 3);
|
1007 |
|
|
if (s->msg == Z_NULL) return (const char*)ERR_MSG(Z_MEM_ERROR);
|
1008 |
|
|
strcpy(s->msg, s->path);
|
1009 |
|
|
strcat(s->msg, ": ");
|
1010 |
|
|
strcat(s->msg, m);
|
1011 |
|
|
return (const char*)s->msg;
|
1012 |
|
|
}
|
1013 |
|
|
|
1014 |
|
|
/* ===========================================================================
|
1015 |
|
|
Clear the error and end-of-file flags, and do the same for the real file.
|
1016 |
|
|
*/
|
1017 |
|
|
void ZEXPORT gzclearerr (file)
|
1018 |
|
|
gzFile file;
|
1019 |
|
|
{
|
1020 |
|
|
gz_stream *s = (gz_stream*)file;
|
1021 |
|
|
|
1022 |
|
|
if (s == NULL) return;
|
1023 |
|
|
if (s->z_err != Z_STREAM_END) s->z_err = Z_OK;
|
1024 |
|
|
s->z_eof = 0;
|
1025 |
|
|
clearerr(s->file);
|
1026 |
|
|
}
|