5128eecc9f 2011-02-23        kinaba: /* gzio.c -- IO on .gz files
5128eecc9f 2011-02-23        kinaba:  * Copyright (C) 1995-1998 Jean-loup Gailly.
5128eecc9f 2011-02-23        kinaba:  * For conditions of distribution and use, see copyright notice in zlib.h
5128eecc9f 2011-02-23        kinaba:  *
5128eecc9f 2011-02-23        kinaba:  * Compile this file with -DNO_DEFLATE to avoid the compression code.
5128eecc9f 2011-02-23        kinaba:  */
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: /* @(#) $Id$ */
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: #include <stdio.h>
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: #include "zutil.h"
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: #ifdef KI_GZ_NO_COMPRESSION
5128eecc9f 2011-02-23        kinaba: #define NO_DEFLATE
5128eecc9f 2011-02-23        kinaba: #endif /* KI_GZ_NO_COMPRESSION */
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: struct internal_state {int dummy;}; /* for buggy compilers */
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: #ifndef Z_BUFSIZE
5128eecc9f 2011-02-23        kinaba: #  ifdef MAXSEG_64K
5128eecc9f 2011-02-23        kinaba: #    define Z_BUFSIZE 4096 /* minimize memory usage for 16-bit DOS */
5128eecc9f 2011-02-23        kinaba: #  else
5128eecc9f 2011-02-23        kinaba: #    define Z_BUFSIZE 16384
5128eecc9f 2011-02-23        kinaba: #  endif
5128eecc9f 2011-02-23        kinaba: #endif
5128eecc9f 2011-02-23        kinaba: #ifndef Z_PRINTF_BUFSIZE
5128eecc9f 2011-02-23        kinaba: #  define Z_PRINTF_BUFSIZE 4096
5128eecc9f 2011-02-23        kinaba: #endif
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: #define ALLOC(size) malloc(size)
5128eecc9f 2011-02-23        kinaba: #define TRYFREE(p) {if (p) free(p);}
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: static int gz_magic[2] = {0x1f, 0x8b}; /* gzip magic header */
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: /* gzip flag byte */
5128eecc9f 2011-02-23        kinaba: #define ASCII_FLAG   0x01 /* bit 0 set: file probably ascii text */
5128eecc9f 2011-02-23        kinaba: #define HEAD_CRC     0x02 /* bit 1 set: header CRC present */
5128eecc9f 2011-02-23        kinaba: #define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
5128eecc9f 2011-02-23        kinaba: #define ORIG_NAME    0x08 /* bit 3 set: original file name present */
5128eecc9f 2011-02-23        kinaba: #define COMMENT      0x10 /* bit 4 set: file comment present */
5128eecc9f 2011-02-23        kinaba: #define RESERVED     0xE0 /* bits 5..7: reserved */
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: typedef struct gz_stream {
5128eecc9f 2011-02-23        kinaba:     z_stream stream;
5128eecc9f 2011-02-23        kinaba:     int      z_err;   /* error code for last stream operation */
5128eecc9f 2011-02-23        kinaba:     int      z_eof;   /* set if end of input file */
5128eecc9f 2011-02-23        kinaba:     FILE     *file;   /* .gz file */
5128eecc9f 2011-02-23        kinaba:     Byte     *inbuf;  /* input buffer */
5128eecc9f 2011-02-23        kinaba:     Byte     *outbuf; /* output buffer */
5128eecc9f 2011-02-23        kinaba:     uLong    crc;     /* crc32 of uncompressed data */
5128eecc9f 2011-02-23        kinaba:     char     *msg;    /* error message */
5128eecc9f 2011-02-23        kinaba:     char     *path;   /* path name for debugging only */
5128eecc9f 2011-02-23        kinaba:     int      transparent; /* 1 if input file is not a .gz file */
5128eecc9f 2011-02-23        kinaba:     char     mode;    /* 'w' or 'r' */
5128eecc9f 2011-02-23        kinaba:     long     startpos; /* start of compressed data in file (header skipped) */
5128eecc9f 2011-02-23        kinaba: } gz_stream;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: local gzFile gz_open      OF((const char *path, const char *mode, int  fd));
5128eecc9f 2011-02-23        kinaba: local int do_flush        OF((gzFile file, int flush));
5128eecc9f 2011-02-23        kinaba: local int    get_byte     OF((gz_stream *s));
5128eecc9f 2011-02-23        kinaba: local void   check_header OF((gz_stream *s));
5128eecc9f 2011-02-23        kinaba: local int    destroy      OF((gz_stream *s));
5128eecc9f 2011-02-23        kinaba: local void   putLong      OF((FILE *file, uLong x));
5128eecc9f 2011-02-23        kinaba: local uLong  getLong      OF((gz_stream *s));
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: /* ===========================================================================
5128eecc9f 2011-02-23        kinaba:      Opens a gzip (.gz) file for reading or writing. The mode parameter
5128eecc9f 2011-02-23        kinaba:    is as in fopen ("rb" or "wb"). The file is given either by file descriptor
5128eecc9f 2011-02-23        kinaba:    or path name (if fd == -1).
5128eecc9f 2011-02-23        kinaba:      gz_open return NULL if the file could not be opened or if there was
5128eecc9f 2011-02-23        kinaba:    insufficient memory to allocate the (de)compression state; errno
5128eecc9f 2011-02-23        kinaba:    can be checked to distinguish the two cases (if errno is zero, the
5128eecc9f 2011-02-23        kinaba:    zlib error is Z_MEM_ERROR).
5128eecc9f 2011-02-23        kinaba: */
5128eecc9f 2011-02-23        kinaba: local gzFile gz_open (path, mode, fd)
5128eecc9f 2011-02-23        kinaba:     const char *path;
5128eecc9f 2011-02-23        kinaba:     const char *mode;
5128eecc9f 2011-02-23        kinaba:     int  fd;
5128eecc9f 2011-02-23        kinaba: {
5128eecc9f 2011-02-23        kinaba:     int err;
5128eecc9f 2011-02-23        kinaba:     int level = Z_DEFAULT_COMPRESSION; /* compression level */
5128eecc9f 2011-02-23        kinaba:     int strategy = Z_DEFAULT_STRATEGY; /* compression strategy */
5128eecc9f 2011-02-23        kinaba:     char *p = (char*)mode;
5128eecc9f 2011-02-23        kinaba:     gz_stream *s;
5128eecc9f 2011-02-23        kinaba:     char fmode[80]; /* copy of mode, without the compression level */
5128eecc9f 2011-02-23        kinaba:     char *m = fmode;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     if (!path || !mode) return Z_NULL;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     s = (gz_stream *)ALLOC(sizeof(gz_stream));
5128eecc9f 2011-02-23        kinaba:     if (!s) return Z_NULL;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     s->stream.zalloc = (alloc_func)0;
5128eecc9f 2011-02-23        kinaba:     s->stream.zfree = (free_func)0;
5128eecc9f 2011-02-23        kinaba:     s->stream.opaque = (voidpf)0;
5128eecc9f 2011-02-23        kinaba:     s->stream.next_in = s->inbuf = Z_NULL;
5128eecc9f 2011-02-23        kinaba:     s->stream.next_out = s->outbuf = Z_NULL;
5128eecc9f 2011-02-23        kinaba:     s->stream.avail_in = s->stream.avail_out = 0;
5128eecc9f 2011-02-23        kinaba:     s->file = NULL;
5128eecc9f 2011-02-23        kinaba:     s->z_err = Z_OK;
5128eecc9f 2011-02-23        kinaba:     s->z_eof = 0;
5128eecc9f 2011-02-23        kinaba:     s->crc = crc32(0L, Z_NULL, 0);
5128eecc9f 2011-02-23        kinaba:     s->msg = NULL;
5128eecc9f 2011-02-23        kinaba:     s->transparent = 0;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     s->path = (char*)ALLOC(strlen(path)+1);
5128eecc9f 2011-02-23        kinaba:     if (s->path == NULL) {
5128eecc9f 2011-02-23        kinaba:         return destroy(s), (gzFile)Z_NULL;
5128eecc9f 2011-02-23        kinaba:     }
5128eecc9f 2011-02-23        kinaba:     strcpy(s->path, path); /* do this early for debugging */
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     s->mode = '\0';
5128eecc9f 2011-02-23        kinaba:     do {
5128eecc9f 2011-02-23        kinaba:         if (*p == 'r') s->mode = 'r';
5128eecc9f 2011-02-23        kinaba:         if (*p == 'w' || *p == 'a') s->mode = 'w';
5128eecc9f 2011-02-23        kinaba:         if (*p >= '0' && *p <= '9') {
5128eecc9f 2011-02-23        kinaba: 	    level = *p - '0';
5128eecc9f 2011-02-23        kinaba: 	} else if (*p == 'f') {
5128eecc9f 2011-02-23        kinaba: 	  strategy = Z_FILTERED;
5128eecc9f 2011-02-23        kinaba: 	} else if (*p == 'h') {
5128eecc9f 2011-02-23        kinaba: 	  strategy = Z_HUFFMAN_ONLY;
5128eecc9f 2011-02-23        kinaba: 	} else {
5128eecc9f 2011-02-23        kinaba: 	    *m++ = *p; /* copy the mode */
5128eecc9f 2011-02-23        kinaba: 	}
5128eecc9f 2011-02-23        kinaba:     } while (*p++ && m != fmode + sizeof(fmode));
5128eecc9f 2011-02-23        kinaba:     if (s->mode == '\0') return destroy(s), (gzFile)Z_NULL;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     if (s->mode == 'w') {
5128eecc9f 2011-02-23        kinaba: #ifdef NO_DEFLATE
5128eecc9f 2011-02-23        kinaba:         err = Z_STREAM_ERROR;
5128eecc9f 2011-02-23        kinaba: #else
5128eecc9f 2011-02-23        kinaba:         err = deflateInit2(&(s->stream), level,
5128eecc9f 2011-02-23        kinaba:                            Z_DEFLATED, -MAX_WBITS, DEF_MEM_LEVEL, strategy);
5128eecc9f 2011-02-23        kinaba:         /* windowBits is passed < 0 to suppress zlib header */
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:         s->stream.next_out = s->outbuf = (Byte*)ALLOC(Z_BUFSIZE);
5128eecc9f 2011-02-23        kinaba: #endif
5128eecc9f 2011-02-23        kinaba:         if (err != Z_OK || s->outbuf == Z_NULL) {
5128eecc9f 2011-02-23        kinaba:             return destroy(s), (gzFile)Z_NULL;
5128eecc9f 2011-02-23        kinaba:         }
5128eecc9f 2011-02-23        kinaba:     } else {
5128eecc9f 2011-02-23        kinaba:         s->stream.next_in  = s->inbuf = (Byte*)ALLOC(Z_BUFSIZE);
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:         err = inflateInit2(&(s->stream), -MAX_WBITS);
5128eecc9f 2011-02-23        kinaba:         /* windowBits is passed < 0 to tell that there is no zlib header.
5128eecc9f 2011-02-23        kinaba:          * Note that in this case inflate *requires* an extra "dummy" byte
5128eecc9f 2011-02-23        kinaba:          * after the compressed stream in order to complete decompression and
5128eecc9f 2011-02-23        kinaba:          * return Z_STREAM_END. Here the gzip CRC32 ensures that 4 bytes are
5128eecc9f 2011-02-23        kinaba:          * present after the compressed stream.
5128eecc9f 2011-02-23        kinaba:          */
5128eecc9f 2011-02-23        kinaba:         if (err != Z_OK || s->inbuf == Z_NULL) {
5128eecc9f 2011-02-23        kinaba:             return destroy(s), (gzFile)Z_NULL;
5128eecc9f 2011-02-23        kinaba:         }
5128eecc9f 2011-02-23        kinaba:     }
5128eecc9f 2011-02-23        kinaba:     s->stream.avail_out = Z_BUFSIZE;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     errno = 0;
5128eecc9f 2011-02-23        kinaba:     s->file = fd < 0 ? F_OPEN(path, fmode) : (FILE*)fdopen(fd, fmode);
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     if (s->file == NULL) {
5128eecc9f 2011-02-23        kinaba:         return destroy(s), (gzFile)Z_NULL;
5128eecc9f 2011-02-23        kinaba:     }
5128eecc9f 2011-02-23        kinaba:     if (s->mode == 'w') {
5128eecc9f 2011-02-23        kinaba:         /* Write a very simple .gz header:
5128eecc9f 2011-02-23        kinaba:          */
5128eecc9f 2011-02-23        kinaba:         fprintf(s->file, "%c%c%c%c%c%c%c%c%c%c", gz_magic[0], gz_magic[1],
5128eecc9f 2011-02-23        kinaba:              Z_DEFLATED, 0 /*flags*/, 0,0,0,0 /*time*/, 0 /*xflags*/, OS_CODE);
5128eecc9f 2011-02-23        kinaba: 	s->startpos = 10L;
5128eecc9f 2011-02-23        kinaba: 	/* We use 10L instead of ftell(s->file) to because ftell causes an
5128eecc9f 2011-02-23        kinaba:          * fflush on some systems. This version of the library doesn't use
5128eecc9f 2011-02-23        kinaba:          * startpos anyway in write mode, so this initialization is not
5128eecc9f 2011-02-23        kinaba:          * necessary.
5128eecc9f 2011-02-23        kinaba:          */
5128eecc9f 2011-02-23        kinaba:     } else {
5128eecc9f 2011-02-23        kinaba: 	check_header(s); /* skip the .gz header */
5128eecc9f 2011-02-23        kinaba: 	s->startpos = (ftell(s->file) - s->stream.avail_in);
5128eecc9f 2011-02-23        kinaba:     }
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     return (gzFile)s;
5128eecc9f 2011-02-23        kinaba: }
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: /* ===========================================================================
5128eecc9f 2011-02-23        kinaba:      Opens a gzip (.gz) file for reading or writing.
5128eecc9f 2011-02-23        kinaba: */
5128eecc9f 2011-02-23        kinaba: gzFile ZEXPORT gzopen (path, mode)
5128eecc9f 2011-02-23        kinaba:     const char *path;
5128eecc9f 2011-02-23        kinaba:     const char *mode;
5128eecc9f 2011-02-23        kinaba: {
5128eecc9f 2011-02-23        kinaba:     return gz_open (path, mode, -1);
5128eecc9f 2011-02-23        kinaba: }
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: /* ===========================================================================
5128eecc9f 2011-02-23        kinaba:      Associate a gzFile with the file descriptor fd. fd is not dup'ed here
5128eecc9f 2011-02-23        kinaba:    to mimic the behavio(u)r of fdopen.
5128eecc9f 2011-02-23        kinaba: */
5128eecc9f 2011-02-23        kinaba: gzFile ZEXPORT gzdopen (fd, mode)
5128eecc9f 2011-02-23        kinaba:     int fd;
5128eecc9f 2011-02-23        kinaba:     const char *mode;
5128eecc9f 2011-02-23        kinaba: {
5128eecc9f 2011-02-23        kinaba:     char name[20];
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     if (fd < 0) return (gzFile)Z_NULL;
5128eecc9f 2011-02-23        kinaba:     sprintf(name, "<fd:%d>", fd); /* for debugging */
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     return gz_open (name, mode, fd);
5128eecc9f 2011-02-23        kinaba: }
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: /* ===========================================================================
5128eecc9f 2011-02-23        kinaba:  * Update the compression level and strategy
5128eecc9f 2011-02-23        kinaba:  */
5128eecc9f 2011-02-23        kinaba: int ZEXPORT gzsetparams (file, level, strategy)
5128eecc9f 2011-02-23        kinaba:     gzFile file;
5128eecc9f 2011-02-23        kinaba:     int level;
5128eecc9f 2011-02-23        kinaba:     int strategy;
5128eecc9f 2011-02-23        kinaba: {
5128eecc9f 2011-02-23        kinaba: #ifndef KI_GZ_NO_COMPRESSION
5128eecc9f 2011-02-23        kinaba:     gz_stream *s = (gz_stream*)file;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     if (s == NULL || s->mode != 'w') return Z_STREAM_ERROR;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     /* Make room to allow flushing */
5128eecc9f 2011-02-23        kinaba:     if (s->stream.avail_out == 0) {
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: 	s->stream.next_out = s->outbuf;
5128eecc9f 2011-02-23        kinaba: 	if (fwrite(s->outbuf, 1, Z_BUFSIZE, s->file) != Z_BUFSIZE) {
5128eecc9f 2011-02-23        kinaba: 	    s->z_err = Z_ERRNO;
5128eecc9f 2011-02-23        kinaba: 	}
5128eecc9f 2011-02-23        kinaba: 	s->stream.avail_out = Z_BUFSIZE;
5128eecc9f 2011-02-23        kinaba:     }
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     return deflateParams (&(s->stream), level, strategy);
5128eecc9f 2011-02-23        kinaba: #else
5128eecc9f 2011-02-23        kinaba: 	return Z_STREAM_ERROR;
5128eecc9f 2011-02-23        kinaba: #endif /* KI_GZ_NO_COMPRESSION */
5128eecc9f 2011-02-23        kinaba: }
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: /* ===========================================================================
5128eecc9f 2011-02-23        kinaba:      Read a byte from a gz_stream; update next_in and avail_in. Return EOF
5128eecc9f 2011-02-23        kinaba:    for end of file.
5128eecc9f 2011-02-23        kinaba:    IN assertion: the stream s has been sucessfully opened for reading.
5128eecc9f 2011-02-23        kinaba: */
5128eecc9f 2011-02-23        kinaba: local int get_byte(s)
5128eecc9f 2011-02-23        kinaba:     gz_stream *s;
5128eecc9f 2011-02-23        kinaba: {
5128eecc9f 2011-02-23        kinaba:     if (s->z_eof) return EOF;
5128eecc9f 2011-02-23        kinaba:     if (s->stream.avail_in == 0) {
5128eecc9f 2011-02-23        kinaba: 	errno = 0;
5128eecc9f 2011-02-23        kinaba: 	s->stream.avail_in = fread(s->inbuf, 1, Z_BUFSIZE, s->file);
5128eecc9f 2011-02-23        kinaba: 	if (s->stream.avail_in == 0) {
5128eecc9f 2011-02-23        kinaba: 	    s->z_eof = 1;
5128eecc9f 2011-02-23        kinaba: 	    if (ferror(s->file)) s->z_err = Z_ERRNO;
5128eecc9f 2011-02-23        kinaba: 	    return EOF;
5128eecc9f 2011-02-23        kinaba: 	}
5128eecc9f 2011-02-23        kinaba: 	s->stream.next_in = s->inbuf;
5128eecc9f 2011-02-23        kinaba:     }
5128eecc9f 2011-02-23        kinaba:     s->stream.avail_in--;
5128eecc9f 2011-02-23        kinaba:     return *(s->stream.next_in)++;
5128eecc9f 2011-02-23        kinaba: }
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: /* ===========================================================================
5128eecc9f 2011-02-23        kinaba:       Check the gzip header of a gz_stream opened for reading. Set the stream
5128eecc9f 2011-02-23        kinaba:     mode to transparent if the gzip magic header is not present; set s->err
5128eecc9f 2011-02-23        kinaba:     to Z_DATA_ERROR if the magic header is present but the rest of the header
5128eecc9f 2011-02-23        kinaba:     is incorrect.
5128eecc9f 2011-02-23        kinaba:     IN assertion: the stream s has already been created sucessfully;
5128eecc9f 2011-02-23        kinaba:        s->stream.avail_in is zero for the first time, but may be non-zero
5128eecc9f 2011-02-23        kinaba:        for concatenated .gz files.
5128eecc9f 2011-02-23        kinaba: */
5128eecc9f 2011-02-23        kinaba: local void check_header(s)
5128eecc9f 2011-02-23        kinaba:     gz_stream *s;
5128eecc9f 2011-02-23        kinaba: {
5128eecc9f 2011-02-23        kinaba:     int method; /* method byte */
5128eecc9f 2011-02-23        kinaba:     int flags;  /* flags byte */
5128eecc9f 2011-02-23        kinaba:     uInt len;
5128eecc9f 2011-02-23        kinaba:     int c;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     /* Check the gzip magic header */
5128eecc9f 2011-02-23        kinaba:     for (len = 0; len < 2; len++) {
5128eecc9f 2011-02-23        kinaba: 	c = get_byte(s);
5128eecc9f 2011-02-23        kinaba: 	if (c != gz_magic[len]) {
5128eecc9f 2011-02-23        kinaba: 	    if (len != 0) s->stream.avail_in++, s->stream.next_in--;
5128eecc9f 2011-02-23        kinaba: 	    if (c != EOF) {
5128eecc9f 2011-02-23        kinaba: 		s->stream.avail_in++, s->stream.next_in--;
5128eecc9f 2011-02-23        kinaba: 		s->transparent = 1;
5128eecc9f 2011-02-23        kinaba: 	    }
5128eecc9f 2011-02-23        kinaba: 	    s->z_err = s->stream.avail_in != 0 ? Z_OK : Z_STREAM_END;
5128eecc9f 2011-02-23        kinaba: 	    return;
5128eecc9f 2011-02-23        kinaba: 	}
5128eecc9f 2011-02-23        kinaba:     }
5128eecc9f 2011-02-23        kinaba:     method = get_byte(s);
5128eecc9f 2011-02-23        kinaba:     flags = get_byte(s);
5128eecc9f 2011-02-23        kinaba:     if (method != Z_DEFLATED || (flags & RESERVED) != 0) {
5128eecc9f 2011-02-23        kinaba: 	s->z_err = Z_DATA_ERROR;
5128eecc9f 2011-02-23        kinaba: 	return;
5128eecc9f 2011-02-23        kinaba:     }
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     /* Discard time, xflags and OS code: */
5128eecc9f 2011-02-23        kinaba:     for (len = 0; len < 6; len++) (void)get_byte(s);
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     if ((flags & EXTRA_FIELD) != 0) { /* skip the extra field */
5128eecc9f 2011-02-23        kinaba: 	len  =  (uInt)get_byte(s);
5128eecc9f 2011-02-23        kinaba: 	len += ((uInt)get_byte(s))<<8;
5128eecc9f 2011-02-23        kinaba: 	/* len is garbage if EOF but the loop below will quit anyway */
5128eecc9f 2011-02-23        kinaba: 	while (len-- != 0 && get_byte(s) != EOF) ;
5128eecc9f 2011-02-23        kinaba:     }
5128eecc9f 2011-02-23        kinaba:     if ((flags & ORIG_NAME) != 0) { /* skip the original file name */
5128eecc9f 2011-02-23        kinaba: 	while ((c = get_byte(s)) != 0 && c != EOF) ;
5128eecc9f 2011-02-23        kinaba:     }
5128eecc9f 2011-02-23        kinaba:     if ((flags & COMMENT) != 0) {   /* skip the .gz file comment */
5128eecc9f 2011-02-23        kinaba: 	while ((c = get_byte(s)) != 0 && c != EOF) ;
5128eecc9f 2011-02-23        kinaba:     }
5128eecc9f 2011-02-23        kinaba:     if ((flags & HEAD_CRC) != 0) {  /* skip the header crc */
5128eecc9f 2011-02-23        kinaba: 	for (len = 0; len < 2; len++) (void)get_byte(s);
5128eecc9f 2011-02-23        kinaba:     }
5128eecc9f 2011-02-23        kinaba:     s->z_err = s->z_eof ? Z_DATA_ERROR : Z_OK;
5128eecc9f 2011-02-23        kinaba: }
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:  /* ===========================================================================
5128eecc9f 2011-02-23        kinaba:  * Cleanup then free the given gz_stream. Return a zlib error code.
5128eecc9f 2011-02-23        kinaba:    Try freeing in the reverse order of allocations.
5128eecc9f 2011-02-23        kinaba:  */
5128eecc9f 2011-02-23        kinaba: local int destroy (s)
5128eecc9f 2011-02-23        kinaba:     gz_stream *s;
5128eecc9f 2011-02-23        kinaba: {
5128eecc9f 2011-02-23        kinaba:     int err = Z_OK;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     if (!s) return Z_STREAM_ERROR;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     TRYFREE(s->msg);
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     if (s->stream.state != NULL) {
5128eecc9f 2011-02-23        kinaba: 	if (s->mode == 'w') {
5128eecc9f 2011-02-23        kinaba: #ifdef NO_DEFLATE
5128eecc9f 2011-02-23        kinaba: 	    err = Z_STREAM_ERROR;
5128eecc9f 2011-02-23        kinaba: #else
5128eecc9f 2011-02-23        kinaba: 	    err = deflateEnd(&(s->stream));
5128eecc9f 2011-02-23        kinaba: #endif
5128eecc9f 2011-02-23        kinaba: 	} else if (s->mode == 'r') {
5128eecc9f 2011-02-23        kinaba: 	    err = inflateEnd(&(s->stream));
5128eecc9f 2011-02-23        kinaba: 	}
5128eecc9f 2011-02-23        kinaba:     }
5128eecc9f 2011-02-23        kinaba:     if (s->file != NULL && fclose(s->file)) {
5128eecc9f 2011-02-23        kinaba: #ifdef ESPIPE
5128eecc9f 2011-02-23        kinaba: 	if (errno != ESPIPE) /* fclose is broken for pipes in HP/UX */
5128eecc9f 2011-02-23        kinaba: #endif
5128eecc9f 2011-02-23        kinaba: 	    err = Z_ERRNO;
5128eecc9f 2011-02-23        kinaba:     }
5128eecc9f 2011-02-23        kinaba:     if (s->z_err < 0) err = s->z_err;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     TRYFREE(s->inbuf);
5128eecc9f 2011-02-23        kinaba:     TRYFREE(s->outbuf);
5128eecc9f 2011-02-23        kinaba:     TRYFREE(s->path);
5128eecc9f 2011-02-23        kinaba:     TRYFREE(s);
5128eecc9f 2011-02-23        kinaba:     return err;
5128eecc9f 2011-02-23        kinaba: }
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: /* ===========================================================================
5128eecc9f 2011-02-23        kinaba:      Reads the given number of uncompressed bytes from the compressed file.
5128eecc9f 2011-02-23        kinaba:    gzread returns the number of bytes actually read (0 for end of file).
5128eecc9f 2011-02-23        kinaba: */
5128eecc9f 2011-02-23        kinaba: int ZEXPORT gzread (file, buf, len)
5128eecc9f 2011-02-23        kinaba:     gzFile file;
5128eecc9f 2011-02-23        kinaba:     voidp buf;
5128eecc9f 2011-02-23        kinaba:     unsigned len;
5128eecc9f 2011-02-23        kinaba: {
5128eecc9f 2011-02-23        kinaba:     gz_stream *s = (gz_stream*)file;
5128eecc9f 2011-02-23        kinaba:     Bytef *start = (Bytef*)buf; /* starting point for crc computation */
5128eecc9f 2011-02-23        kinaba:     Byte  *next_out; /* == stream.next_out but not forced far (for MSDOS) */
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     if (s == NULL || s->mode != 'r') return Z_STREAM_ERROR;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     if (s->z_err == Z_DATA_ERROR || s->z_err == Z_ERRNO) return -1;
5128eecc9f 2011-02-23        kinaba:     if (s->z_err == Z_STREAM_END) return 0;  /* EOF */
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     next_out = (Byte*)buf;
5128eecc9f 2011-02-23        kinaba:     s->stream.next_out = (Bytef*)buf;
5128eecc9f 2011-02-23        kinaba:     s->stream.avail_out = len;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     while (s->stream.avail_out != 0) {
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: 	if (s->transparent) {
5128eecc9f 2011-02-23        kinaba: 	    /* Copy first the lookahead bytes: */
5128eecc9f 2011-02-23        kinaba: 	    uInt n = s->stream.avail_in;
5128eecc9f 2011-02-23        kinaba: 	    if (n > s->stream.avail_out) n = s->stream.avail_out;
5128eecc9f 2011-02-23        kinaba: 	    if (n > 0) {
5128eecc9f 2011-02-23        kinaba: 		zmemcpy(s->stream.next_out, s->stream.next_in, n);
5128eecc9f 2011-02-23        kinaba: 		next_out += n;
5128eecc9f 2011-02-23        kinaba: 		s->stream.next_out = next_out;
5128eecc9f 2011-02-23        kinaba: 		s->stream.next_in   += n;
5128eecc9f 2011-02-23        kinaba: 		s->stream.avail_out -= n;
5128eecc9f 2011-02-23        kinaba: 		s->stream.avail_in  -= n;
5128eecc9f 2011-02-23        kinaba: 	    }
5128eecc9f 2011-02-23        kinaba: 	    if (s->stream.avail_out > 0) {
5128eecc9f 2011-02-23        kinaba: 		s->stream.avail_out -= fread(next_out, 1, s->stream.avail_out,
5128eecc9f 2011-02-23        kinaba: 					     s->file);
5128eecc9f 2011-02-23        kinaba: 	    }
5128eecc9f 2011-02-23        kinaba: 	    len -= s->stream.avail_out;
5128eecc9f 2011-02-23        kinaba: 	    s->stream.total_in  += (uLong)len;
5128eecc9f 2011-02-23        kinaba: 	    s->stream.total_out += (uLong)len;
5128eecc9f 2011-02-23        kinaba:             if (len == 0) s->z_eof = 1;
5128eecc9f 2011-02-23        kinaba: 	    return (int)len;
5128eecc9f 2011-02-23        kinaba: 	}
5128eecc9f 2011-02-23        kinaba:         if (s->stream.avail_in == 0 && !s->z_eof) {
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:             errno = 0;
5128eecc9f 2011-02-23        kinaba:             s->stream.avail_in = fread(s->inbuf, 1, Z_BUFSIZE, s->file);
5128eecc9f 2011-02-23        kinaba:             if (s->stream.avail_in == 0) {
5128eecc9f 2011-02-23        kinaba:                 s->z_eof = 1;
5128eecc9f 2011-02-23        kinaba: 		if (ferror(s->file)) {
5128eecc9f 2011-02-23        kinaba: 		    s->z_err = Z_ERRNO;
5128eecc9f 2011-02-23        kinaba: 		    break;
5128eecc9f 2011-02-23        kinaba: 		}
5128eecc9f 2011-02-23        kinaba:             }
5128eecc9f 2011-02-23        kinaba:             s->stream.next_in = s->inbuf;
5128eecc9f 2011-02-23        kinaba:         }
5128eecc9f 2011-02-23        kinaba:         s->z_err = inflate(&(s->stream), Z_NO_FLUSH);
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: 	if (s->z_err == Z_STREAM_END) {
5128eecc9f 2011-02-23        kinaba: 	    /* Check CRC and original size */
5128eecc9f 2011-02-23        kinaba: 	    s->crc = crc32(s->crc, start, (uInt)(s->stream.next_out - start));
5128eecc9f 2011-02-23        kinaba: 	    start = s->stream.next_out;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: 	    if (getLong(s) != s->crc) {
5128eecc9f 2011-02-23        kinaba: 		s->z_err = Z_DATA_ERROR;
5128eecc9f 2011-02-23        kinaba: 	    } else {
5128eecc9f 2011-02-23        kinaba: 	        (void)getLong(s);
5128eecc9f 2011-02-23        kinaba:                 /* The uncompressed length returned by above getlong() may
5128eecc9f 2011-02-23        kinaba:                  * be different from s->stream.total_out) in case of
5128eecc9f 2011-02-23        kinaba: 		 * concatenated .gz files. Check for such files:
5128eecc9f 2011-02-23        kinaba: 		 */
5128eecc9f 2011-02-23        kinaba: 		check_header(s);
5128eecc9f 2011-02-23        kinaba: 		if (s->z_err == Z_OK) {
5128eecc9f 2011-02-23        kinaba: 		    uLong total_in = s->stream.total_in;
5128eecc9f 2011-02-23        kinaba: 		    uLong total_out = s->stream.total_out;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: 		    inflateReset(&(s->stream));
5128eecc9f 2011-02-23        kinaba: 		    s->stream.total_in = total_in;
5128eecc9f 2011-02-23        kinaba: 		    s->stream.total_out = total_out;
5128eecc9f 2011-02-23        kinaba: 		    s->crc = crc32(0L, Z_NULL, 0);
5128eecc9f 2011-02-23        kinaba: 		}
5128eecc9f 2011-02-23        kinaba: 	    }
5128eecc9f 2011-02-23        kinaba: 	}
5128eecc9f 2011-02-23        kinaba: 	if (s->z_err != Z_OK || s->z_eof) break;
5128eecc9f 2011-02-23        kinaba:     }
5128eecc9f 2011-02-23        kinaba:     s->crc = crc32(s->crc, start, (uInt)(s->stream.next_out - start));
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     return (int)(len - s->stream.avail_out);
5128eecc9f 2011-02-23        kinaba: }
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: /* ===========================================================================
5128eecc9f 2011-02-23        kinaba:       Reads one byte from the compressed file. gzgetc returns this byte
5128eecc9f 2011-02-23        kinaba:    or -1 in case of end of file or error.
5128eecc9f 2011-02-23        kinaba: */
5128eecc9f 2011-02-23        kinaba: int ZEXPORT gzgetc(file)
5128eecc9f 2011-02-23        kinaba:     gzFile file;
5128eecc9f 2011-02-23        kinaba: {
5128eecc9f 2011-02-23        kinaba:     unsigned char c;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     return gzread(file, &c, 1) == 1 ? c : -1;
5128eecc9f 2011-02-23        kinaba: }
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: /* ===========================================================================
5128eecc9f 2011-02-23        kinaba:       Reads bytes from the compressed file until len-1 characters are
5128eecc9f 2011-02-23        kinaba:    read, or a newline character is read and transferred to buf, or an
5128eecc9f 2011-02-23        kinaba:    end-of-file condition is encountered.  The string is then terminated
5128eecc9f 2011-02-23        kinaba:    with a null character.
5128eecc9f 2011-02-23        kinaba:       gzgets returns buf, or Z_NULL in case of error.
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:       The current implementation is not optimized at all.
5128eecc9f 2011-02-23        kinaba: */
5128eecc9f 2011-02-23        kinaba: char * ZEXPORT gzgets(file, buf, len)
5128eecc9f 2011-02-23        kinaba:     gzFile file;
5128eecc9f 2011-02-23        kinaba:     char *buf;
5128eecc9f 2011-02-23        kinaba:     int len;
5128eecc9f 2011-02-23        kinaba: {
5128eecc9f 2011-02-23        kinaba:     char *b = buf;
5128eecc9f 2011-02-23        kinaba:     if (buf == Z_NULL || len <= 0) return Z_NULL;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     while (--len > 0 && gzread(file, buf, 1) == 1 && *buf++ != '\n') ;
5128eecc9f 2011-02-23        kinaba:     *buf = '\0';
5128eecc9f 2011-02-23        kinaba:     return b == buf && len > 0 ? Z_NULL : b;
5128eecc9f 2011-02-23        kinaba: }
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: #ifndef NO_DEFLATE
5128eecc9f 2011-02-23        kinaba: /* ===========================================================================
5128eecc9f 2011-02-23        kinaba:      Writes the given number of uncompressed bytes into the compressed file.
5128eecc9f 2011-02-23        kinaba:    gzwrite returns the number of bytes actually written (0 in case of error).
5128eecc9f 2011-02-23        kinaba: */
5128eecc9f 2011-02-23        kinaba: int ZEXPORT gzwrite (file, buf, len)
5128eecc9f 2011-02-23        kinaba:     gzFile file;
5128eecc9f 2011-02-23        kinaba:     const voidp buf;
5128eecc9f 2011-02-23        kinaba:     unsigned len;
5128eecc9f 2011-02-23        kinaba: {
5128eecc9f 2011-02-23        kinaba:     gz_stream *s = (gz_stream*)file;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     if (s == NULL || s->mode != 'w') return Z_STREAM_ERROR;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     s->stream.next_in = (Bytef*)buf;
5128eecc9f 2011-02-23        kinaba:     s->stream.avail_in = len;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     while (s->stream.avail_in != 0) {
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:         if (s->stream.avail_out == 0) {
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:             s->stream.next_out = s->outbuf;
5128eecc9f 2011-02-23        kinaba:             if (fwrite(s->outbuf, 1, Z_BUFSIZE, s->file) != Z_BUFSIZE) {
5128eecc9f 2011-02-23        kinaba:                 s->z_err = Z_ERRNO;
5128eecc9f 2011-02-23        kinaba:                 break;
5128eecc9f 2011-02-23        kinaba:             }
5128eecc9f 2011-02-23        kinaba:             s->stream.avail_out = Z_BUFSIZE;
5128eecc9f 2011-02-23        kinaba:         }
5128eecc9f 2011-02-23        kinaba:         s->z_err = deflate(&(s->stream), Z_NO_FLUSH);
5128eecc9f 2011-02-23        kinaba:         if (s->z_err != Z_OK) break;
5128eecc9f 2011-02-23        kinaba:     }
5128eecc9f 2011-02-23        kinaba:     s->crc = crc32(s->crc, (const Bytef *)buf, len);
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     return (int)(len - s->stream.avail_in);
5128eecc9f 2011-02-23        kinaba: }
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: /* ===========================================================================
5128eecc9f 2011-02-23        kinaba:      Converts, formats, and writes the args to the compressed file under
5128eecc9f 2011-02-23        kinaba:    control of the format string, as in fprintf. gzprintf returns the number of
5128eecc9f 2011-02-23        kinaba:    uncompressed bytes actually written (0 in case of error).
5128eecc9f 2011-02-23        kinaba: */
5128eecc9f 2011-02-23        kinaba: #ifdef STDC
5128eecc9f 2011-02-23        kinaba: #include <stdarg.h>
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: int ZEXPORTVA gzprintf (gzFile file, const char *format, /* args */ ...)
5128eecc9f 2011-02-23        kinaba: {
5128eecc9f 2011-02-23        kinaba:     char buf[Z_PRINTF_BUFSIZE];
5128eecc9f 2011-02-23        kinaba:     va_list va;
5128eecc9f 2011-02-23        kinaba:     int len;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     va_start(va, format);
5128eecc9f 2011-02-23        kinaba: #ifdef HAS_vsnprintf
5128eecc9f 2011-02-23        kinaba:     (void)vsnprintf(buf, sizeof(buf), format, va);
5128eecc9f 2011-02-23        kinaba: #else
5128eecc9f 2011-02-23        kinaba:     (void)vsprintf(buf, format, va);
5128eecc9f 2011-02-23        kinaba: #endif
5128eecc9f 2011-02-23        kinaba:     va_end(va);
5128eecc9f 2011-02-23        kinaba:     len = strlen(buf); /* some *sprintf don't return the nb of bytes written */
5128eecc9f 2011-02-23        kinaba:     if (len <= 0) return 0;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     return gzwrite(file, buf, (unsigned)len);
5128eecc9f 2011-02-23        kinaba: }
5128eecc9f 2011-02-23        kinaba: #else /* not ANSI C */
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: int ZEXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
5128eecc9f 2011-02-23        kinaba: 	               a11, a12, a13, a14, a15, a16, a17, a18, a19, a20)
5128eecc9f 2011-02-23        kinaba:     gzFile file;
5128eecc9f 2011-02-23        kinaba:     const char *format;
5128eecc9f 2011-02-23        kinaba:     int a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
5128eecc9f 2011-02-23        kinaba: 	a11, a12, a13, a14, a15, a16, a17, a18, a19, a20;
5128eecc9f 2011-02-23        kinaba: {
5128eecc9f 2011-02-23        kinaba:     char buf[Z_PRINTF_BUFSIZE];
5128eecc9f 2011-02-23        kinaba:     int len;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: #ifdef HAS_snprintf
5128eecc9f 2011-02-23        kinaba:     snprintf(buf, sizeof(buf), format, a1, a2, a3, a4, a5, a6, a7, a8,
5128eecc9f 2011-02-23        kinaba: 	     a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
5128eecc9f 2011-02-23        kinaba: #else
5128eecc9f 2011-02-23        kinaba:     sprintf(buf, format, a1, a2, a3, a4, a5, a6, a7, a8,
5128eecc9f 2011-02-23        kinaba: 	    a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
5128eecc9f 2011-02-23        kinaba: #endif
5128eecc9f 2011-02-23        kinaba:     len = strlen(buf); /* old sprintf doesn't return the nb of bytes written */
5128eecc9f 2011-02-23        kinaba:     if (len <= 0) return 0;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     return gzwrite(file, buf, len);
5128eecc9f 2011-02-23        kinaba: }
5128eecc9f 2011-02-23        kinaba: #endif
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: /* ===========================================================================
5128eecc9f 2011-02-23        kinaba:       Writes c, converted to an unsigned char, into the compressed file.
5128eecc9f 2011-02-23        kinaba:    gzputc returns the value that was written, or -1 in case of error.
5128eecc9f 2011-02-23        kinaba: */
5128eecc9f 2011-02-23        kinaba: int ZEXPORT gzputc(file, c)
5128eecc9f 2011-02-23        kinaba:     gzFile file;
5128eecc9f 2011-02-23        kinaba:     int c;
5128eecc9f 2011-02-23        kinaba: {
5128eecc9f 2011-02-23        kinaba:     unsigned char cc = (unsigned char) c; /* required for big endian systems */
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     return gzwrite(file, &cc, 1) == 1 ? (int)cc : -1;
5128eecc9f 2011-02-23        kinaba: }
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: /* ===========================================================================
5128eecc9f 2011-02-23        kinaba:       Writes the given null-terminated string to the compressed file, excluding
5128eecc9f 2011-02-23        kinaba:    the terminating null character.
5128eecc9f 2011-02-23        kinaba:       gzputs returns the number of characters written, or -1 in case of error.
5128eecc9f 2011-02-23        kinaba: */
5128eecc9f 2011-02-23        kinaba: int ZEXPORT gzputs(file, s)
5128eecc9f 2011-02-23        kinaba:     gzFile file;
5128eecc9f 2011-02-23        kinaba:     const char *s;
5128eecc9f 2011-02-23        kinaba: {
5128eecc9f 2011-02-23        kinaba:     return gzwrite(file, (char*)s, (unsigned)strlen(s));
5128eecc9f 2011-02-23        kinaba: }
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: /* ===========================================================================
5128eecc9f 2011-02-23        kinaba:      Flushes all pending output into the compressed file. The parameter
5128eecc9f 2011-02-23        kinaba:    flush is as in the deflate() function.
5128eecc9f 2011-02-23        kinaba: */
5128eecc9f 2011-02-23        kinaba: local int do_flush (file, flush)
5128eecc9f 2011-02-23        kinaba:     gzFile file;
5128eecc9f 2011-02-23        kinaba:     int flush;
5128eecc9f 2011-02-23        kinaba: {
5128eecc9f 2011-02-23        kinaba:     uInt len;
5128eecc9f 2011-02-23        kinaba:     int done = 0;
5128eecc9f 2011-02-23        kinaba:     gz_stream *s = (gz_stream*)file;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     if (s == NULL || s->mode != 'w') return Z_STREAM_ERROR;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     s->stream.avail_in = 0; /* should be zero already anyway */
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     for (;;) {
5128eecc9f 2011-02-23        kinaba:         len = Z_BUFSIZE - s->stream.avail_out;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:         if (len != 0) {
5128eecc9f 2011-02-23        kinaba:             if ((uInt)fwrite(s->outbuf, 1, len, s->file) != len) {
5128eecc9f 2011-02-23        kinaba:                 s->z_err = Z_ERRNO;
5128eecc9f 2011-02-23        kinaba:                 return Z_ERRNO;
5128eecc9f 2011-02-23        kinaba:             }
5128eecc9f 2011-02-23        kinaba:             s->stream.next_out = s->outbuf;
5128eecc9f 2011-02-23        kinaba:             s->stream.avail_out = Z_BUFSIZE;
5128eecc9f 2011-02-23        kinaba:         }
5128eecc9f 2011-02-23        kinaba:         if (done) break;
5128eecc9f 2011-02-23        kinaba:         s->z_err = deflate(&(s->stream), flush);
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: 	/* Ignore the second of two consecutive flushes: */
5128eecc9f 2011-02-23        kinaba: 	if (len == 0 && s->z_err == Z_BUF_ERROR) s->z_err = Z_OK;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:         /* deflate has finished flushing only when it hasn't used up
5128eecc9f 2011-02-23        kinaba:          * all the available space in the output buffer:
5128eecc9f 2011-02-23        kinaba:          */
5128eecc9f 2011-02-23        kinaba:         done = (s->stream.avail_out != 0 || s->z_err == Z_STREAM_END);
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:         if (s->z_err != Z_OK && s->z_err != Z_STREAM_END) break;
5128eecc9f 2011-02-23        kinaba:     }
5128eecc9f 2011-02-23        kinaba:     return  s->z_err == Z_STREAM_END ? Z_OK : s->z_err;
5128eecc9f 2011-02-23        kinaba: }
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: int ZEXPORT gzflush (file, flush)
5128eecc9f 2011-02-23        kinaba:      gzFile file;
5128eecc9f 2011-02-23        kinaba:      int flush;
5128eecc9f 2011-02-23        kinaba: {
5128eecc9f 2011-02-23        kinaba:     gz_stream *s = (gz_stream*)file;
5128eecc9f 2011-02-23        kinaba:     int err = do_flush (file, flush);
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     if (err) return err;
5128eecc9f 2011-02-23        kinaba:     fflush(s->file);
5128eecc9f 2011-02-23        kinaba:     return  s->z_err == Z_STREAM_END ? Z_OK : s->z_err;
5128eecc9f 2011-02-23        kinaba: }
5128eecc9f 2011-02-23        kinaba: #endif /* NO_DEFLATE */
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: /* ===========================================================================
5128eecc9f 2011-02-23        kinaba:       Sets the starting position for the next gzread or gzwrite on the given
5128eecc9f 2011-02-23        kinaba:    compressed file. The offset represents a number of bytes in the
5128eecc9f 2011-02-23        kinaba:       gzseek returns the resulting offset location as measured in bytes from
5128eecc9f 2011-02-23        kinaba:    the beginning of the uncompressed stream, or -1 in case of error.
5128eecc9f 2011-02-23        kinaba:       SEEK_END is not implemented, returns error.
5128eecc9f 2011-02-23        kinaba:       In this version of the library, gzseek can be extremely slow.
5128eecc9f 2011-02-23        kinaba: */
5128eecc9f 2011-02-23        kinaba: z_off_t ZEXPORT gzseek (file, offset, whence)
5128eecc9f 2011-02-23        kinaba:     gzFile file;
5128eecc9f 2011-02-23        kinaba:     z_off_t offset;
5128eecc9f 2011-02-23        kinaba:     int whence;
5128eecc9f 2011-02-23        kinaba: {
5128eecc9f 2011-02-23        kinaba:     gz_stream *s = (gz_stream*)file;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     if (s == NULL || whence == SEEK_END ||
5128eecc9f 2011-02-23        kinaba: 	s->z_err == Z_ERRNO || s->z_err == Z_DATA_ERROR) {
5128eecc9f 2011-02-23        kinaba: 	return -1L;
5128eecc9f 2011-02-23        kinaba:     }
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     if (s->mode == 'w') {
5128eecc9f 2011-02-23        kinaba: #ifdef NO_DEFLATE
5128eecc9f 2011-02-23        kinaba: 	return -1L;
5128eecc9f 2011-02-23        kinaba: #else
5128eecc9f 2011-02-23        kinaba: 	if (whence == SEEK_SET) {
5128eecc9f 2011-02-23        kinaba: 	    offset -= s->stream.total_in;
5128eecc9f 2011-02-23        kinaba: 	}
5128eecc9f 2011-02-23        kinaba: 	if (offset < 0) return -1L;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: 	/* At this point, offset is the number of zero bytes to write. */
5128eecc9f 2011-02-23        kinaba: 	if (s->inbuf == Z_NULL) {
5128eecc9f 2011-02-23        kinaba: 	    s->inbuf = (Byte*)ALLOC(Z_BUFSIZE); /* for seeking */
5128eecc9f 2011-02-23        kinaba: 	    zmemzero(s->inbuf, Z_BUFSIZE);
5128eecc9f 2011-02-23        kinaba: 	}
5128eecc9f 2011-02-23        kinaba: 	while (offset > 0)  {
5128eecc9f 2011-02-23        kinaba: 	    uInt size = Z_BUFSIZE;
5128eecc9f 2011-02-23        kinaba: 	    if (offset < Z_BUFSIZE) size = (uInt)offset;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: 	    size = gzwrite(file, s->inbuf, size);
5128eecc9f 2011-02-23        kinaba: 	    if (size == 0) return -1L;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: 	    offset -= size;
5128eecc9f 2011-02-23        kinaba: 	}
5128eecc9f 2011-02-23        kinaba: 	return (z_off_t)s->stream.total_in;
5128eecc9f 2011-02-23        kinaba: #endif
5128eecc9f 2011-02-23        kinaba:     }
5128eecc9f 2011-02-23        kinaba:     /* Rest of function is for reading only */
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     /* compute absolute position */
5128eecc9f 2011-02-23        kinaba:     if (whence == SEEK_CUR) {
5128eecc9f 2011-02-23        kinaba: 	offset += s->stream.total_out;
5128eecc9f 2011-02-23        kinaba:     }
5128eecc9f 2011-02-23        kinaba:     if (offset < 0) return -1L;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     if (s->transparent) {
5128eecc9f 2011-02-23        kinaba: 	/* map to fseek */
5128eecc9f 2011-02-23        kinaba: 	s->stream.avail_in = 0;
5128eecc9f 2011-02-23        kinaba: 	s->stream.next_in = s->inbuf;
5128eecc9f 2011-02-23        kinaba:         if (fseek(s->file, offset, SEEK_SET) < 0) return -1L;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: 	s->stream.total_in = s->stream.total_out = (uLong)offset;
5128eecc9f 2011-02-23        kinaba: 	return offset;
5128eecc9f 2011-02-23        kinaba:     }
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     /* For a negative seek, rewind and use positive seek */
5128eecc9f 2011-02-23        kinaba:     if ((uLong)offset >= s->stream.total_out) {
5128eecc9f 2011-02-23        kinaba: 	offset -= s->stream.total_out;
5128eecc9f 2011-02-23        kinaba:     } else if (gzrewind(file) < 0) {
5128eecc9f 2011-02-23        kinaba: 	return -1L;
5128eecc9f 2011-02-23        kinaba:     }
5128eecc9f 2011-02-23        kinaba:     /* offset is now the number of bytes to skip. */
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     if (offset != 0 && s->outbuf == Z_NULL) {
5128eecc9f 2011-02-23        kinaba: 	s->outbuf = (Byte*)ALLOC(Z_BUFSIZE);
5128eecc9f 2011-02-23        kinaba:     }
5128eecc9f 2011-02-23        kinaba:     while (offset > 0)  {
5128eecc9f 2011-02-23        kinaba: 	int size = Z_BUFSIZE;
5128eecc9f 2011-02-23        kinaba: 	if (offset < Z_BUFSIZE) size = (int)offset;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: 	size = gzread(file, s->outbuf, (uInt)size);
5128eecc9f 2011-02-23        kinaba: 	if (size <= 0) return -1L;
5128eecc9f 2011-02-23        kinaba: 	offset -= size;
5128eecc9f 2011-02-23        kinaba:     }
5128eecc9f 2011-02-23        kinaba:     return (z_off_t)s->stream.total_out;
5128eecc9f 2011-02-23        kinaba: }
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: /* ===========================================================================
5128eecc9f 2011-02-23        kinaba:      Rewinds input file.
5128eecc9f 2011-02-23        kinaba: */
5128eecc9f 2011-02-23        kinaba: int ZEXPORT gzrewind (file)
5128eecc9f 2011-02-23        kinaba:     gzFile file;
5128eecc9f 2011-02-23        kinaba: {
5128eecc9f 2011-02-23        kinaba:     gz_stream *s = (gz_stream*)file;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     if (s == NULL || s->mode != 'r') return -1;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     s->z_err = Z_OK;
5128eecc9f 2011-02-23        kinaba:     s->z_eof = 0;
5128eecc9f 2011-02-23        kinaba:     s->stream.avail_in = 0;
5128eecc9f 2011-02-23        kinaba:     s->stream.next_in = s->inbuf;
5128eecc9f 2011-02-23        kinaba:     s->crc = crc32(0L, Z_NULL, 0);
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     if (s->startpos == 0) { /* not a compressed file */
5128eecc9f 2011-02-23        kinaba: 	rewind(s->file);
5128eecc9f 2011-02-23        kinaba: 	return 0;
5128eecc9f 2011-02-23        kinaba:     }
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     (void) inflateReset(&s->stream);
5128eecc9f 2011-02-23        kinaba:     return fseek(s->file, s->startpos, SEEK_SET);
5128eecc9f 2011-02-23        kinaba: }
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: /* ===========================================================================
5128eecc9f 2011-02-23        kinaba:      Returns the starting position for the next gzread or gzwrite on the
5128eecc9f 2011-02-23        kinaba:    given compressed file. This position represents a number of bytes in the
5128eecc9f 2011-02-23        kinaba:    uncompressed data stream.
5128eecc9f 2011-02-23        kinaba: */
5128eecc9f 2011-02-23        kinaba: z_off_t ZEXPORT gztell (file)
5128eecc9f 2011-02-23        kinaba:     gzFile file;
5128eecc9f 2011-02-23        kinaba: {
5128eecc9f 2011-02-23        kinaba:     return gzseek(file, 0L, SEEK_CUR);
5128eecc9f 2011-02-23        kinaba: }
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: /* ===========================================================================
5128eecc9f 2011-02-23        kinaba:      Returns 1 when EOF has previously been detected reading the given
5128eecc9f 2011-02-23        kinaba:    input stream, otherwise zero.
5128eecc9f 2011-02-23        kinaba: */
5128eecc9f 2011-02-23        kinaba: int ZEXPORT gzeof (file)
5128eecc9f 2011-02-23        kinaba:     gzFile file;
5128eecc9f 2011-02-23        kinaba: {
5128eecc9f 2011-02-23        kinaba:     gz_stream *s = (gz_stream*)file;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     return (s == NULL || s->mode != 'r') ? 0 : s->z_eof;
5128eecc9f 2011-02-23        kinaba: }
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: /* ===========================================================================
5128eecc9f 2011-02-23        kinaba:    Outputs a long in LSB order to the given file
5128eecc9f 2011-02-23        kinaba: */
5128eecc9f 2011-02-23        kinaba: local void putLong (file, x)
5128eecc9f 2011-02-23        kinaba:     FILE *file;
5128eecc9f 2011-02-23        kinaba:     uLong x;
5128eecc9f 2011-02-23        kinaba: {
5128eecc9f 2011-02-23        kinaba:     int n;
5128eecc9f 2011-02-23        kinaba:     for (n = 0; n < 4; n++) {
5128eecc9f 2011-02-23        kinaba:         fputc((int)(x & 0xff), file);
5128eecc9f 2011-02-23        kinaba:         x >>= 8;
5128eecc9f 2011-02-23        kinaba:     }
5128eecc9f 2011-02-23        kinaba: }
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: /* ===========================================================================
5128eecc9f 2011-02-23        kinaba:    Reads a long in LSB order from the given gz_stream. Sets z_err in case
5128eecc9f 2011-02-23        kinaba:    of error.
5128eecc9f 2011-02-23        kinaba: */
5128eecc9f 2011-02-23        kinaba: local uLong getLong (s)
5128eecc9f 2011-02-23        kinaba:     gz_stream *s;
5128eecc9f 2011-02-23        kinaba: {
5128eecc9f 2011-02-23        kinaba:     uLong x = (uLong)get_byte(s);
5128eecc9f 2011-02-23        kinaba:     int c;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     x += ((uLong)get_byte(s))<<8;
5128eecc9f 2011-02-23        kinaba:     x += ((uLong)get_byte(s))<<16;
5128eecc9f 2011-02-23        kinaba:     c = get_byte(s);
5128eecc9f 2011-02-23        kinaba:     if (c == EOF) s->z_err = Z_DATA_ERROR;
5128eecc9f 2011-02-23        kinaba:     x += ((uLong)c)<<24;
5128eecc9f 2011-02-23        kinaba:     return x;
5128eecc9f 2011-02-23        kinaba: }
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: /* ===========================================================================
5128eecc9f 2011-02-23        kinaba:      Flushes all pending output if necessary, closes the compressed file
5128eecc9f 2011-02-23        kinaba:    and deallocates all the (de)compression state.
5128eecc9f 2011-02-23        kinaba: */
5128eecc9f 2011-02-23        kinaba: int ZEXPORT gzclose (file)
5128eecc9f 2011-02-23        kinaba:     gzFile file;
5128eecc9f 2011-02-23        kinaba: {
5128eecc9f 2011-02-23        kinaba:     gz_stream *s = (gz_stream*)file;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     if (s == NULL) return Z_STREAM_ERROR;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     if (s->mode == 'w') {
5128eecc9f 2011-02-23        kinaba: #ifdef NO_DEFLATE
5128eecc9f 2011-02-23        kinaba: 	return Z_STREAM_ERROR;
5128eecc9f 2011-02-23        kinaba: #else
5128eecc9f 2011-02-23        kinaba:         err = do_flush (file, Z_FINISH);
5128eecc9f 2011-02-23        kinaba:         if (err != Z_OK) return destroy((gz_stream*)file);
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:         putLong (s->file, s->crc);
5128eecc9f 2011-02-23        kinaba:         putLong (s->file, s->stream.total_in);
5128eecc9f 2011-02-23        kinaba: #endif
5128eecc9f 2011-02-23        kinaba:     }
5128eecc9f 2011-02-23        kinaba:     return destroy((gz_stream*)file);
5128eecc9f 2011-02-23        kinaba: }
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: /* ===========================================================================
5128eecc9f 2011-02-23        kinaba:      Returns the error message for the last error which occured on the
5128eecc9f 2011-02-23        kinaba:    given compressed file. errnum is set to zlib error number. If an
5128eecc9f 2011-02-23        kinaba:    error occured in the file system and not in the compression library,
5128eecc9f 2011-02-23        kinaba:    errnum is set to Z_ERRNO and the application may consult errno
5128eecc9f 2011-02-23        kinaba:    to get the exact error code.
5128eecc9f 2011-02-23        kinaba: */
5128eecc9f 2011-02-23        kinaba: const char*  ZEXPORT gzerror (file, errnum)
5128eecc9f 2011-02-23        kinaba:     gzFile file;
5128eecc9f 2011-02-23        kinaba:     int *errnum;
5128eecc9f 2011-02-23        kinaba: {
5128eecc9f 2011-02-23        kinaba:     char *m;
5128eecc9f 2011-02-23        kinaba:     gz_stream *s = (gz_stream*)file;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     if (s == NULL) {
5128eecc9f 2011-02-23        kinaba:         *errnum = Z_STREAM_ERROR;
5128eecc9f 2011-02-23        kinaba:         return (const char*)ERR_MSG(Z_STREAM_ERROR);
5128eecc9f 2011-02-23        kinaba:     }
5128eecc9f 2011-02-23        kinaba:     *errnum = s->z_err;
5128eecc9f 2011-02-23        kinaba:     if (*errnum == Z_OK) return (const char*)"";
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     m =  (char*)(*errnum == Z_ERRNO ? zstrerror(errno) : s->stream.msg);
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     if (m == NULL || *m == '\0') m = (char*)ERR_MSG(s->z_err);
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     TRYFREE(s->msg);
5128eecc9f 2011-02-23        kinaba:     s->msg = (char*)ALLOC(strlen(s->path) + strlen(m) + 3);
5128eecc9f 2011-02-23        kinaba:     strcpy(s->msg, s->path);
5128eecc9f 2011-02-23        kinaba:     strcat(s->msg, ": ");
5128eecc9f 2011-02-23        kinaba:     strcat(s->msg, m);
5128eecc9f 2011-02-23        kinaba:     return (const char*)s->msg;
5128eecc9f 2011-02-23        kinaba: }