sl@0: /* gzio.c -- IO on .gz files
sl@0:  * Copyright (C) 1995-1998 Jean-loup Gailly.
sl@0:  * For conditions of distribution and use, see copyright notice in zlib.h
sl@0:  *
sl@0:  * Compile this file with -DNO_DEFLATE to avoid the compression code.
sl@0:  */
sl@0: 
sl@0: /* @(#) $Id$ */
sl@0: 
sl@0: #include "zutil.h"
sl@0: // include this after zutil so we don't get warning anbout multiple definitons 
sl@0: // of NULL Markr 6/9/199, Symbian.
sl@0: #include <stdio.h> 
sl@0: 
sl@0: 
sl@0: struct internal_state {int dummy;}; /* for buggy compilers */
sl@0: 
sl@0: #ifndef Z_BUFSIZE
sl@0: #  ifdef MAXSEG_64K
sl@0: #    define Z_BUFSIZE 4096 /* minimize memory usage for 16-bit DOS */
sl@0: #  else
sl@0: #    define Z_BUFSIZE 16384
sl@0: #  endif
sl@0: #endif
sl@0: #ifndef Z_PRINTF_BUFSIZE
sl@0: #  define Z_PRINTF_BUFSIZE 4096
sl@0: #endif
sl@0: 
sl@0: #define ALLOC(size) malloc(size)
sl@0: #define TRYFREE(p) {if (p) free(p);}
sl@0: 
sl@0: static  const int gz_magic[2] = {0x1f, 0x8b}; /* gzip magic header */
sl@0: 
sl@0: /* gzip flag byte */
sl@0: #define ASCII_FLAG   0x01 /* bit 0 set: file probably ascii text */
sl@0: #define HEAD_CRC     0x02 /* bit 1 set: header CRC present */
sl@0: #define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
sl@0: #define ORIG_NAME    0x08 /* bit 3 set: original file name present */
sl@0: #define COMMENT      0x10 /* bit 4 set: file comment present */
sl@0: #define RESERVED     0xE0 /* bits 5..7: reserved */
sl@0: 
sl@0: typedef struct gz_stream {
sl@0:     z_stream stream;
sl@0:     int      z_err;   /* error code for last stream operation */
sl@0:     int      z_eof;   /* set if end of input file */
sl@0:     FILE     *file;   /* .gz file */
sl@0:     Byte     *inbuf;  /* input buffer */
sl@0:     Byte     *outbuf; /* output buffer */
sl@0:     uLong    crc;     /* crc32 of uncompressed data */
sl@0:     char     *msg;    /* error message */
sl@0:     char     *path;   /* path name for debugging only */
sl@0:     int      transparent; /* 1 if input file is not a .gz file */
sl@0:     char     mode;    /* 'w' or 'r' */
sl@0:     long     startpos; /* start of compressed data in file (header skipped) */
sl@0: } gz_stream;
sl@0: 
sl@0: 
sl@0: local gzFile gz_open      OF((const char *path, const char *mode, int  fd));
sl@0: local int do_flush        OF((gzFile file, int flush));
sl@0: local int    get_byte     OF((gz_stream *s));
sl@0: local void   check_header OF((gz_stream *s));
sl@0: local int    destroy      OF((gz_stream *s));
sl@0: local void   putLong      OF((FILE *file, uLong x));
sl@0: local uLong  getLong      OF((gz_stream *s));
sl@0: 
sl@0: /* ===========================================================================
sl@0:      Opens a gzip (.gz) file for reading or writing. The mode parameter
sl@0:    is as in fopen ("rb" or "wb"). The file is given either by file descriptor
sl@0:    or path name (if fd == -1).
sl@0:      gz_open return NULL if the file could not be opened or if there was
sl@0:    insufficient memory to allocate the (de)compression state; errno
sl@0:    can be checked to distinguish the two cases (if errno is zero, the
sl@0:    zlib error is Z_MEM_ERROR).
sl@0: */
sl@0: local gzFile gz_open (
sl@0:     const char *path,
sl@0:     const char *mode,
sl@0:     int  fd)
sl@0: {
sl@0:     int err;
sl@0:     int level = Z_DEFAULT_COMPRESSION; /* compression level */
sl@0:     int strategy = Z_DEFAULT_STRATEGY; /* compression strategy */
sl@0:     char *p = (char*)mode;
sl@0:     gz_stream *s;
sl@0:     char fmode[80]; /* copy of mode, without the compression level */
sl@0:     char *m = fmode;
sl@0: 
sl@0:     if (!path || !mode) return Z_NULL;
sl@0: 
sl@0:     s = (gz_stream *)ALLOC(sizeof(gz_stream));
sl@0:     if (!s) return Z_NULL;
sl@0: 
sl@0:     s->stream.zalloc = (alloc_func)0;
sl@0:     s->stream.zfree = (free_func)0;
sl@0:     s->stream.opaque = (voidpf)0;
sl@0:     s->stream.next_in = s->inbuf = Z_NULL;
sl@0:     s->stream.next_out = s->outbuf = Z_NULL;
sl@0:     s->stream.avail_in = s->stream.avail_out = 0;
sl@0:     s->file = NULL;
sl@0:     s->z_err = Z_OK;
sl@0:     s->z_eof = 0;
sl@0:     s->crc = crc32(0L, Z_NULL, 0);
sl@0:     s->msg = NULL;
sl@0:     s->transparent = 0;
sl@0: 
sl@0:     s->path = (char*)ALLOC(strlen(path)+1);
sl@0:     if (s->path == NULL) {
sl@0:         return destroy(s), (gzFile)Z_NULL;
sl@0:     }
sl@0:     strcpy(s->path, path); /* do this early for debugging */
sl@0: 
sl@0:     s->mode = '\0';
sl@0:     do {
sl@0:         if (*p == 'r') s->mode = 'r';
sl@0:         if (*p == 'w' || *p == 'a') s->mode = 'w';
sl@0:         if (*p >= '0' && *p <= '9') {
sl@0: 	    level = *p - '0';
sl@0: 	} else if (*p == 'f') {
sl@0: 	  strategy = Z_FILTERED;
sl@0: 	} else if (*p == 'h') {
sl@0: 	  strategy = Z_HUFFMAN_ONLY;
sl@0: 	} else {
sl@0: 	    *m++ = *p; /* copy the mode */
sl@0: 	}
sl@0:     } while (*p++ && m != fmode + sizeof(fmode));
sl@0:     if (s->mode == '\0') return destroy(s), (gzFile)Z_NULL;
sl@0:     
sl@0:     if (s->mode == 'w') {
sl@0: #ifdef NO_DEFLATE
sl@0:         err = Z_STREAM_ERROR;
sl@0: #else
sl@0:         err = deflateInit2(&(s->stream), level,
sl@0:                            Z_DEFLATED, -MAX_WBITS, DEF_MEM_LEVEL, strategy);
sl@0:         /* windowBits is passed < 0 to suppress zlib header */
sl@0: 
sl@0:         s->stream.next_out = s->outbuf = (Byte*)ALLOC(Z_BUFSIZE);
sl@0: #endif
sl@0:         if (err != Z_OK || s->outbuf == Z_NULL) {
sl@0:             return destroy(s), (gzFile)Z_NULL;
sl@0:         }
sl@0:     } else {
sl@0:         s->stream.next_in  = s->inbuf = (Byte*)ALLOC(Z_BUFSIZE);
sl@0: 
sl@0:         err = inflateInit2(&(s->stream), -MAX_WBITS);
sl@0:         /* windowBits is passed < 0 to tell that there is no zlib header.
sl@0:          * Note that in this case inflate *requires* an extra "dummy" byte
sl@0:          * after the compressed stream in order to complete decompression and
sl@0:          * return Z_STREAM_END. Here the gzip CRC32 ensures that 4 bytes are
sl@0:          * present after the compressed stream.
sl@0:          */
sl@0:         if (err != Z_OK || s->inbuf == Z_NULL) {
sl@0:             return destroy(s), (gzFile)Z_NULL;
sl@0:         }
sl@0:     }
sl@0:     s->stream.avail_out = Z_BUFSIZE;
sl@0: 
sl@0:     errno = 0;
sl@0:     s->file = fd < 0 ? F_OPEN(path, fmode) : (FILE*)fdopen(fd, fmode);
sl@0: 
sl@0:     if (s->file == NULL) {
sl@0:         return destroy(s), (gzFile)Z_NULL;
sl@0:     }
sl@0:     if (s->mode == 'w') {
sl@0:         /* Write a very simple .gz header:
sl@0:          */
sl@0:         fprintf(s->file, "%c%c%c%c%c%c%c%c%c%c", gz_magic[0], gz_magic[1],
sl@0:              Z_DEFLATED, 0 /*flags*/, 0,0,0,0 /*time*/, 0 /*xflags*/, OS_CODE);
sl@0: 	s->startpos = 10L;
sl@0: 	/* We use 10L instead of ftell(s->file) to because ftell causes an
sl@0:          * fflush on some systems. This version of the library doesn't use
sl@0:          * startpos anyway in write mode, so this initialization is not
sl@0:          * necessary.
sl@0:          */
sl@0:     } else {
sl@0: 	check_header(s); /* skip the .gz header */
sl@0: 	s->startpos = (ftell(s->file) - s->stream.avail_in);
sl@0:     }
sl@0:     
sl@0:     return (gzFile)s;
sl@0: }
sl@0: 
sl@0: /* ===========================================================================
sl@0:      Opens a gzip (.gz) file for reading or writing.
sl@0: */
sl@0: EXPORT_C gzFile ZEXPORT gzopen (
sl@0:     const char *path,
sl@0:     const char *mode)
sl@0: {
sl@0:     return gz_open (path, mode, -1);
sl@0: }
sl@0: 
sl@0: /* ===========================================================================
sl@0:      Associate a gzFile with the file descriptor fd. fd is not dup'ed here
sl@0:    to mimic the behavio(u)r of fdopen.
sl@0: */
sl@0: EXPORT_C gzFile ZEXPORT gzdopen (
sl@0:     int fd,
sl@0:     const char *mode)
sl@0: {
sl@0:     char name[20];
sl@0: 
sl@0:     if (fd < 0) return (gzFile)Z_NULL;
sl@0:     sprintf(name, "<fd:%d>", fd); /* for debugging */
sl@0: 
sl@0:     return gz_open (name, mode, fd);
sl@0: }
sl@0: 
sl@0: /* ===========================================================================
sl@0:  * Update the compression level and strategy
sl@0:  */
sl@0: EXPORT_C int ZEXPORT gzsetparams (
sl@0:     gzFile file,
sl@0:     int level,
sl@0:     int strategy)
sl@0: {
sl@0:     gz_stream *s = (gz_stream*)file;
sl@0: 
sl@0:     if (s == NULL || s->mode != 'w') return Z_STREAM_ERROR;
sl@0: 
sl@0:     /* Make room to allow flushing */
sl@0:     if (s->stream.avail_out == 0) {
sl@0: 
sl@0: 	s->stream.next_out = s->outbuf;
sl@0: 	if (fwrite(s->outbuf, 1, Z_BUFSIZE, s->file) != Z_BUFSIZE) {
sl@0: 	    s->z_err = Z_ERRNO;
sl@0: 	}
sl@0: 	s->stream.avail_out = Z_BUFSIZE;
sl@0:     }
sl@0: 
sl@0:     return deflateParams (&(s->stream), level, strategy);
sl@0: }
sl@0: 
sl@0: /* ===========================================================================
sl@0:      Read a byte from a gz_stream; update next_in and avail_in. Return EOF
sl@0:    for end of file.
sl@0:    IN assertion: the stream s has been sucessfully opened for reading.
sl@0: */
sl@0: local int get_byte(
sl@0:     gz_stream *s)
sl@0: {
sl@0:     if (s->z_eof) return EOF;
sl@0:     if (s->stream.avail_in == 0) {
sl@0: 	errno = 0;
sl@0: 	s->stream.avail_in = fread(s->inbuf, 1, Z_BUFSIZE, s->file);
sl@0: 	if (s->stream.avail_in == 0) {
sl@0: 	    s->z_eof = 1;
sl@0: 	    if (ferror(s->file)) s->z_err = Z_ERRNO;
sl@0: 	    return EOF;
sl@0: 	}
sl@0: 	s->stream.next_in = s->inbuf;
sl@0:     }
sl@0:     s->stream.avail_in--;
sl@0:     return *(s->stream.next_in)++;
sl@0: }
sl@0: 
sl@0: /* ===========================================================================
sl@0:       Check the gzip header of a gz_stream opened for reading. Set the stream
sl@0:     mode to transparent if the gzip magic header is not present; set s->err
sl@0:     to Z_DATA_ERROR if the magic header is present but the rest of the header
sl@0:     is incorrect.
sl@0:     IN assertion: the stream s has already been created sucessfully;
sl@0:        s->stream.avail_in is zero for the first time, but may be non-zero
sl@0:        for concatenated .gz files.
sl@0: */
sl@0: local void check_header(
sl@0:     gz_stream *s)
sl@0: {
sl@0:     int method; /* method byte */
sl@0:     int flags;  /* flags byte */
sl@0:     uInt len;
sl@0:     int c;
sl@0: 
sl@0:     /* Check the gzip magic header */
sl@0:     for (len = 0; len < 2; len++) {
sl@0: 	c = get_byte(s);
sl@0: 	if (c != gz_magic[len]) {
sl@0: 	    if (len != 0) s->stream.avail_in++, s->stream.next_in--;
sl@0: 	    if (c != EOF) {
sl@0: 		s->stream.avail_in++, s->stream.next_in--;
sl@0: 		s->transparent = 1;
sl@0: 	    }
sl@0: 	    s->z_err = s->stream.avail_in != 0 ? Z_OK : Z_STREAM_END;
sl@0: 	    return;
sl@0: 	}
sl@0:     }
sl@0:     method = get_byte(s);
sl@0:     flags = get_byte(s);
sl@0:     if (method != Z_DEFLATED || (flags & RESERVED) != 0) {
sl@0: 	s->z_err = Z_DATA_ERROR;
sl@0: 	return;
sl@0:     }
sl@0: 
sl@0:     /* Discard time, xflags and OS code: */
sl@0:     for (len = 0; len < 6; len++) (void)get_byte(s);
sl@0: 
sl@0:     if ((flags & EXTRA_FIELD) != 0) { /* skip the extra field */
sl@0: 	len  =  (uInt)get_byte(s);
sl@0: 	len += ((uInt)get_byte(s))<<8;
sl@0: 	/* len is garbage if EOF but the loop below will quit anyway */
sl@0: 	while (len-- != 0 && get_byte(s) != EOF) ;
sl@0:     }
sl@0:     if ((flags & ORIG_NAME) != 0) { /* skip the original file name */
sl@0: 	while ((c = get_byte(s)) != 0 && c != EOF) ;
sl@0:     }
sl@0:     if ((flags & COMMENT) != 0) {   /* skip the .gz file comment */
sl@0: 	while ((c = get_byte(s)) != 0 && c != EOF) ;
sl@0:     }
sl@0:     if ((flags & HEAD_CRC) != 0) {  /* skip the header crc */
sl@0: 	for (len = 0; len < 2; len++) (void)get_byte(s);
sl@0:     }
sl@0:     s->z_err = s->z_eof ? Z_DATA_ERROR : Z_OK;
sl@0: }
sl@0: 
sl@0:  /* ===========================================================================
sl@0:  * Cleanup then free the given gz_stream. Return a zlib error code.
sl@0:    Try freeing in the reverse order of allocations.
sl@0:  */
sl@0: local int destroy (
sl@0:     gz_stream *s)
sl@0: {
sl@0:     int err = Z_OK;
sl@0: 
sl@0:     if (!s) return Z_STREAM_ERROR;
sl@0: 
sl@0:     TRYFREE(s->msg);
sl@0: 
sl@0:     if (s->stream.state != NULL) {
sl@0: 	if (s->mode == 'w') {
sl@0: #ifdef NO_DEFLATE
sl@0: 	    err = Z_STREAM_ERROR;
sl@0: #else
sl@0: 	    err = deflateEnd(&(s->stream));
sl@0: #endif
sl@0: 	} else if (s->mode == 'r') {
sl@0: 	    err = inflateEnd(&(s->stream));
sl@0: 	}
sl@0:     }
sl@0:     if (s->file != NULL && fclose(s->file)) {
sl@0: #ifdef ESPIPE
sl@0: 	if (errno != ESPIPE) /* fclose is broken for pipes in HP/UX */
sl@0: #endif
sl@0: 	    err = Z_ERRNO;
sl@0:     }
sl@0:     if (s->z_err < 0) err = s->z_err;
sl@0: 
sl@0:     TRYFREE(s->inbuf);
sl@0:     TRYFREE(s->outbuf);
sl@0:     TRYFREE(s->path);
sl@0:     TRYFREE(s);
sl@0:     return err;
sl@0: }
sl@0: 
sl@0: /* ===========================================================================
sl@0:      Reads the given number of uncompressed bytes from the compressed file.
sl@0:    gzread returns the number of bytes actually read (0 for end of file).
sl@0: */
sl@0: EXPORT_C int ZEXPORT gzread (
sl@0:     gzFile file,
sl@0:     voidp buf,
sl@0:     unsigned len)
sl@0: {
sl@0:     gz_stream *s = (gz_stream*)file;
sl@0:     Bytef *start = (Bytef*)buf; /* starting point for crc computation */
sl@0:     Byte  *next_out; /* == stream.next_out but not forced far (for MSDOS) */
sl@0: 
sl@0:     if (s == NULL || s->mode != 'r') return Z_STREAM_ERROR;
sl@0: 
sl@0:     if (s->z_err == Z_DATA_ERROR || s->z_err == Z_ERRNO) return -1;
sl@0:     if (s->z_err == Z_STREAM_END) return 0;  /* EOF */
sl@0: 
sl@0:     next_out = (Byte*)buf;
sl@0:     s->stream.next_out = (Bytef*)buf;
sl@0:     s->stream.avail_out = len;
sl@0: 
sl@0:     while (s->stream.avail_out != 0) {
sl@0: 
sl@0: 	if (s->transparent) {
sl@0: 	    /* Copy first the lookahead bytes: */
sl@0: 	    uInt n = s->stream.avail_in;
sl@0: 	    if (n > s->stream.avail_out) n = s->stream.avail_out;
sl@0: 	    if (n > 0) {
sl@0: 		zmemcpy(s->stream.next_out, s->stream.next_in, n);
sl@0: 		next_out += n;
sl@0: 		s->stream.next_out = next_out;
sl@0: 		s->stream.next_in   += n;
sl@0: 		s->stream.avail_out -= n;
sl@0: 		s->stream.avail_in  -= n;
sl@0: 	    }
sl@0: 	    if (s->stream.avail_out > 0) {
sl@0: 		s->stream.avail_out -= fread(next_out, 1, s->stream.avail_out,
sl@0: 					     s->file);
sl@0: 	    }
sl@0: 	    len -= s->stream.avail_out;
sl@0: 	    s->stream.total_in  += (uLong)len;
sl@0: 	    s->stream.total_out += (uLong)len;
sl@0:             if (len == 0) s->z_eof = 1;
sl@0: 	    return (int)len;
sl@0: 	}
sl@0:         if (s->stream.avail_in == 0 && !s->z_eof) {
sl@0: 
sl@0:             errno = 0;
sl@0:             s->stream.avail_in = fread(s->inbuf, 1, Z_BUFSIZE, s->file);
sl@0:             if (s->stream.avail_in == 0) {
sl@0:                 s->z_eof = 1;
sl@0: 		if (ferror(s->file)) {
sl@0: 		    s->z_err = Z_ERRNO;
sl@0: 		    break;
sl@0: 		}
sl@0:             }
sl@0:             s->stream.next_in = s->inbuf;
sl@0:         }
sl@0:         s->z_err = inflate(&(s->stream), Z_NO_FLUSH);
sl@0: 
sl@0: 	if (s->z_err == Z_STREAM_END) {
sl@0: 	    /* Check CRC and original size */
sl@0: 	    s->crc = crc32(s->crc, start, (uInt)(s->stream.next_out - start));
sl@0: 	    start = s->stream.next_out;
sl@0: 
sl@0: 	    if (getLong(s) != s->crc) {
sl@0: 		s->z_err = Z_DATA_ERROR;
sl@0: 	    } else {
sl@0: 	        (void)getLong(s);
sl@0:                 /* The uncompressed length returned by above getlong() may
sl@0:                  * be different from s->stream.total_out) in case of
sl@0: 		 * concatenated .gz files. Check for such files:
sl@0: 		 */
sl@0: 		check_header(s);
sl@0: 		if (s->z_err == Z_OK) {
sl@0: 		    uLong total_in = s->stream.total_in;
sl@0: 		    uLong total_out = s->stream.total_out;
sl@0: 
sl@0: 		    inflateReset(&(s->stream));
sl@0: 		    s->stream.total_in = total_in;
sl@0: 		    s->stream.total_out = total_out;
sl@0: 		    s->crc = crc32(0L, Z_NULL, 0);
sl@0: 		}
sl@0: 	    }
sl@0: 	}
sl@0: 	if (s->z_err != Z_OK || s->z_eof) break;
sl@0:     }
sl@0:     s->crc = crc32(s->crc, start, (uInt)(s->stream.next_out - start));
sl@0: 
sl@0:     return (int)(len - s->stream.avail_out);
sl@0: }
sl@0: 
sl@0: 
sl@0: /* ===========================================================================
sl@0:       Reads one byte from the compressed file. gzgetc returns this byte
sl@0:    or -1 in case of end of file or error.
sl@0: */
sl@0: EXPORT_C int ZEXPORT gzgetc(
sl@0:     gzFile file)
sl@0: {
sl@0:     unsigned char c;
sl@0: 
sl@0:     return gzread(file, &c, 1) == 1 ? c : -1;
sl@0: }
sl@0: 
sl@0: 
sl@0: /* ===========================================================================
sl@0:       Reads bytes from the compressed file until len-1 characters are
sl@0:    read, or a newline character is read and transferred to buf, or an
sl@0:    end-of-file condition is encountered.  The string is then terminated
sl@0:    with a null character.
sl@0:       gzgets returns buf, or Z_NULL in case of error.
sl@0: 
sl@0:       The current implementation is not optimized at all.
sl@0: */
sl@0: EXPORT_C char * ZEXPORT gzgets(
sl@0:     gzFile file,
sl@0:     char *buf,
sl@0:     int len)
sl@0: {
sl@0:     char *b = buf;
sl@0:     if (buf == Z_NULL || len <= 0) return Z_NULL;
sl@0: 
sl@0:     while (--len > 0 && gzread(file, buf, 1) == 1 && *buf++ != '\n') ;
sl@0:     *buf = '\0';
sl@0:     return b == buf && len > 0 ? Z_NULL : b;
sl@0: }
sl@0: 
sl@0: 
sl@0: #ifndef NO_DEFLATE
sl@0: /* ===========================================================================
sl@0:      Writes the given number of uncompressed bytes into the compressed file.
sl@0:    gzwrite returns the number of bytes actually written (0 in case of error).
sl@0: */
sl@0: EXPORT_C int ZEXPORT gzwrite (
sl@0:     gzFile file,
sl@0:     const voidp buf,
sl@0:     unsigned len)
sl@0: {
sl@0:     gz_stream *s = (gz_stream*)file;
sl@0: 
sl@0:     if (s == NULL || s->mode != 'w') return Z_STREAM_ERROR;
sl@0: 
sl@0:     s->stream.next_in = (Bytef*)buf;
sl@0:     s->stream.avail_in = len;
sl@0: 
sl@0:     while (s->stream.avail_in != 0) {
sl@0: 
sl@0:         if (s->stream.avail_out == 0) {
sl@0: 
sl@0:             s->stream.next_out = s->outbuf;
sl@0:             if (fwrite(s->outbuf, 1, Z_BUFSIZE, s->file) != Z_BUFSIZE) {
sl@0:                 s->z_err = Z_ERRNO;
sl@0:                 break;
sl@0:             }
sl@0:             s->stream.avail_out = Z_BUFSIZE;
sl@0:         }
sl@0:         s->z_err = deflate(&(s->stream), Z_NO_FLUSH);
sl@0:         if (s->z_err != Z_OK) break;
sl@0:     }
sl@0:     s->crc = crc32(s->crc, (const Bytef *)buf, len);
sl@0: 
sl@0:     return (int)(len - s->stream.avail_in);
sl@0: }
sl@0: 
sl@0: /* ===========================================================================
sl@0:      Converts, formats, and writes the args to the compressed file under
sl@0:    control of the format string, as in fprintf. gzprintf returns the number of
sl@0:    uncompressed bytes actually written (0 in case of error).
sl@0: */
sl@0: 
sl@0: // This function has been modified to use heap memory instead of the stack for the buffer.
sl@0: // Markr 6/9/99 Symbian.
sl@0: 
sl@0: #ifdef STDC
sl@0: #include <stdarg.h>
sl@0: 
sl@0: EXPORT_C int ZEXPORTVA gzprintf (gzFile file, const char *format, /* args */ ...)
sl@0: {
sl@0: 	char *buf = (char*) ALLOC(Z_PRINTF_BUFSIZE);  
sl@0: 	int retval = 0; 
sl@0:     va_list va;
sl@0:     int len;
sl@0: 
sl@0:     va_start(va, format);
sl@0: #ifdef HAS_vsnprintf
sl@0:     (void)vsnprintf(buf, sizeof(buf), format, va);
sl@0: #else
sl@0:     (void)vsprintf(buf, format, va);
sl@0: #endif
sl@0:     va_end(va);
sl@0:     len = strlen(buf); /* some *sprintf don't return the nb of bytes written */
sl@0:     if (len > 0) 
sl@0: 	{
sl@0: 		retval = gzwrite(file, buf, (unsigned)len);
sl@0: 	}
sl@0: 	TRYFREE(buf);  
sl@0: 	return retval; 
sl@0: }
sl@0: #else /* not ANSI C */
sl@0: 
sl@0: int ZEXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
sl@0: 	               a11, a12, a13, a14, a15, a16, a17, a18, a19, a20)
sl@0:     gzFile file;
sl@0:     const char *format;
sl@0:     int a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
sl@0: 	a11, a12, a13, a14, a15, a16, a17, a18, a19, a20;
sl@0: {
sl@0:     char buf[Z_PRINTF_BUFSIZE];
sl@0:     int len;
sl@0: 
sl@0: #ifdef HAS_snprintf
sl@0:     snprintf(buf, sizeof(buf), format, a1, a2, a3, a4, a5, a6, a7, a8,
sl@0: 	     a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
sl@0: #else
sl@0:     sprintf(buf, format, a1, a2, a3, a4, a5, a6, a7, a8,
sl@0: 	    a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
sl@0: #endif
sl@0:     len = strlen(buf); /* old sprintf doesn't return the nb of bytes written */
sl@0:     if (len <= 0) return 0;
sl@0: 
sl@0:     return gzwrite(file, buf, len);
sl@0: }
sl@0: #endif
sl@0: 
sl@0: /* ===========================================================================
sl@0:       Writes c, converted to an unsigned char, into the compressed file.
sl@0:    gzputc returns the value that was written, or -1 in case of error.
sl@0: */
sl@0: EXPORT_C int ZEXPORT gzputc(
sl@0:     gzFile file,
sl@0:     int c)
sl@0: {
sl@0:     unsigned char cc = (unsigned char) c; /* required for big endian systems */
sl@0: 
sl@0:     return gzwrite(file, &cc, 1) == 1 ? (int)cc : -1;
sl@0: }
sl@0: 
sl@0: 
sl@0: /* ===========================================================================
sl@0:       Writes the given null-terminated string to the compressed file, excluding
sl@0:    the terminating null character.
sl@0:       gzputs returns the number of characters written, or -1 in case of error.
sl@0: */
sl@0: EXPORT_C int ZEXPORT gzputs(
sl@0:     gzFile file,
sl@0:     const char *s)
sl@0: {
sl@0:     return gzwrite(file, (char*)s, (unsigned)strlen(s));
sl@0: }
sl@0: 
sl@0: 
sl@0: /* ===========================================================================
sl@0:      Flushes all pending output into the compressed file. The parameter
sl@0:    flush is as in the deflate() function.
sl@0: */
sl@0: local int do_flush (
sl@0:     gzFile file,
sl@0:     int flush)
sl@0: {
sl@0:     uInt len;
sl@0:     int done = 0;
sl@0:     gz_stream *s = (gz_stream*)file;
sl@0: 
sl@0:     if (s == NULL || s->mode != 'w') return Z_STREAM_ERROR;
sl@0: 
sl@0:     s->stream.avail_in = 0; /* should be zero already anyway */
sl@0: 
sl@0:     for (;;) {
sl@0:         len = Z_BUFSIZE - s->stream.avail_out;
sl@0: 
sl@0:         if (len != 0) {
sl@0:             if ((uInt)fwrite(s->outbuf, 1, len, s->file) != len) {
sl@0:                 s->z_err = Z_ERRNO;
sl@0:                 return Z_ERRNO;
sl@0:             }
sl@0:             s->stream.next_out = s->outbuf;
sl@0:             s->stream.avail_out = Z_BUFSIZE;
sl@0:         }
sl@0:         if (done) break;
sl@0:         s->z_err = deflate(&(s->stream), flush);
sl@0: 
sl@0: 	/* Ignore the second of two consecutive flushes: */
sl@0: 	if (len == 0 && s->z_err == Z_BUF_ERROR) s->z_err = Z_OK;
sl@0: 
sl@0:         /* deflate has finished flushing only when it hasn't used up
sl@0:          * all the available space in the output buffer: 
sl@0:          */
sl@0:         done = (s->stream.avail_out != 0 || s->z_err == Z_STREAM_END);
sl@0:  
sl@0:         if (s->z_err != Z_OK && s->z_err != Z_STREAM_END) break;
sl@0:     }
sl@0:     return  s->z_err == Z_STREAM_END ? Z_OK : s->z_err;
sl@0: }
sl@0: 
sl@0: EXPORT_C int ZEXPORT gzflush (
sl@0:      gzFile file,
sl@0:      int flush)
sl@0: {
sl@0:     gz_stream *s = (gz_stream*)file;
sl@0:     int err = do_flush (file, flush);
sl@0: 
sl@0:     if (err) return err;
sl@0:     fflush(s->file);
sl@0:     return  s->z_err == Z_STREAM_END ? Z_OK : s->z_err;
sl@0: }
sl@0: #endif /* NO_DEFLATE */
sl@0: 
sl@0: /* ===========================================================================
sl@0:       Sets the starting position for the next gzread or gzwrite on the given
sl@0:    compressed file. The offset represents a number of bytes in the
sl@0:       gzseek returns the resulting offset location as measured in bytes from
sl@0:    the beginning of the uncompressed stream, or -1 in case of error.
sl@0:       SEEK_END is not implemented, returns error.
sl@0:       In this version of the library, gzseek can be extremely slow.
sl@0: */
sl@0: EXPORT_C z_off_t ZEXPORT gzseek (
sl@0:     gzFile file,
sl@0:     z_off_t offset,
sl@0:     int whence)
sl@0: {
sl@0:     gz_stream *s = (gz_stream*)file;
sl@0: 
sl@0:     if (s == NULL || whence == SEEK_END ||
sl@0: 	s->z_err == Z_ERRNO || s->z_err == Z_DATA_ERROR) {
sl@0: 	return -1L;
sl@0:     }
sl@0:     
sl@0:     if (s->mode == 'w') {
sl@0: #ifdef NO_DEFLATE
sl@0: 	return -1L;
sl@0: #else
sl@0: 	if (whence == SEEK_SET) {
sl@0: 	    offset -= s->stream.total_in;
sl@0: 	}
sl@0: 	if (offset < 0) return -1L;
sl@0: 
sl@0: 	/* At this point, offset is the number of zero bytes to write. */
sl@0: 	if (s->inbuf == Z_NULL) {
sl@0: 	    s->inbuf = (Byte*)ALLOC(Z_BUFSIZE); /* for seeking */
sl@0: 	    zmemzero(s->inbuf, Z_BUFSIZE);
sl@0: 	}
sl@0: 	while (offset > 0)  {
sl@0: 	    uInt size = Z_BUFSIZE;
sl@0: 	    if (offset < Z_BUFSIZE) size = (uInt)offset;
sl@0: 
sl@0: 	    size = gzwrite(file, s->inbuf, size);
sl@0: 	    if (size == 0) return -1L;
sl@0: 
sl@0: 	    offset -= size;
sl@0: 	}
sl@0: 	return (z_off_t)s->stream.total_in;
sl@0: #endif
sl@0:     }
sl@0:     /* Rest of function is for reading only */
sl@0: 
sl@0:     /* compute absolute position */
sl@0:     if (whence == SEEK_CUR) {
sl@0: 	offset += s->stream.total_out;
sl@0:     }
sl@0:     if (offset < 0) return -1L;
sl@0: 
sl@0:     if (s->transparent) {
sl@0: 	/* map to fseek */
sl@0: 	s->stream.avail_in = 0;
sl@0: 	s->stream.next_in = s->inbuf;
sl@0:         if (fseek(s->file, offset, SEEK_SET) < 0) return -1L;
sl@0: 
sl@0: 	s->stream.total_in = s->stream.total_out = (uLong)offset;
sl@0: 	return offset;
sl@0:     }
sl@0: 
sl@0:     /* For a negative seek, rewind and use positive seek */
sl@0:     if ((uLong)offset >= s->stream.total_out) {
sl@0: 	offset -= s->stream.total_out;
sl@0:     } else if (gzrewind(file) < 0) {
sl@0: 	return -1L;
sl@0:     }
sl@0:     /* offset is now the number of bytes to skip. */
sl@0: 
sl@0:     if (offset != 0 && s->outbuf == Z_NULL) {
sl@0: 	s->outbuf = (Byte*)ALLOC(Z_BUFSIZE);
sl@0:     }
sl@0:     while (offset > 0)  {
sl@0: 	int size = Z_BUFSIZE;
sl@0: 	if (offset < Z_BUFSIZE) size = (int)offset;
sl@0: 
sl@0: 	size = gzread(file, s->outbuf, (uInt)size);
sl@0: 	if (size <= 0) return -1L;
sl@0: 	offset -= size;
sl@0:     }
sl@0:     return (z_off_t)s->stream.total_out;
sl@0: }
sl@0: 
sl@0: /* ===========================================================================
sl@0:      Rewinds input file. 
sl@0: */
sl@0: EXPORT_C int ZEXPORT gzrewind (
sl@0:     gzFile file)
sl@0: {
sl@0:     gz_stream *s = (gz_stream*)file;
sl@0:     
sl@0:     if (s == NULL || s->mode != 'r') return -1;
sl@0: 
sl@0:     s->z_err = Z_OK;
sl@0:     s->z_eof = 0;
sl@0:     s->stream.avail_in = 0;
sl@0:     s->stream.next_in = s->inbuf;
sl@0:     s->crc = crc32(0L, Z_NULL, 0);
sl@0: 	
sl@0:     if (s->startpos == 0) { /* not a compressed file */
sl@0: 	rewind(s->file);
sl@0: 	return 0;
sl@0:     }
sl@0: 
sl@0:     (void) inflateReset(&s->stream);
sl@0:     return fseek(s->file, s->startpos, SEEK_SET);
sl@0: }
sl@0: 
sl@0: /* ===========================================================================
sl@0:      Returns the starting position for the next gzread or gzwrite on the
sl@0:    given compressed file. This position represents a number of bytes in the
sl@0:    uncompressed data stream.
sl@0: */
sl@0: EXPORT_C z_off_t ZEXPORT gztell (
sl@0:     gzFile file)
sl@0: {
sl@0:     return gzseek(file, 0L, SEEK_CUR);
sl@0: }
sl@0: 
sl@0: /* ===========================================================================
sl@0:      Returns 1 when EOF has previously been detected reading the given
sl@0:    input stream, otherwise zero.
sl@0: */
sl@0: EXPORT_C int ZEXPORT gzeof (
sl@0:     gzFile file)
sl@0: {
sl@0:     gz_stream *s = (gz_stream*)file;
sl@0:     
sl@0:     return (s == NULL || s->mode != 'r') ? 0 : s->z_eof;
sl@0: }
sl@0: 
sl@0: /* ===========================================================================
sl@0:    Outputs a long in LSB order to the given file
sl@0: */
sl@0: local void putLong (
sl@0:     FILE *file,
sl@0:     uLong x)
sl@0: {
sl@0:     int n;
sl@0:     for (n = 0; n < 4; n++) {
sl@0:         fputc((int)(x & 0xff), file);
sl@0:         x >>= 8;
sl@0:     }
sl@0: }
sl@0: 
sl@0: /* ===========================================================================
sl@0:    Reads a long in LSB order from the given gz_stream. Sets z_err in case
sl@0:    of error.
sl@0: */
sl@0: local uLong getLong (
sl@0:     gz_stream *s)
sl@0: {
sl@0:     uLong x = (uLong)get_byte(s);
sl@0:     int c;
sl@0: 
sl@0:     x += ((uLong)get_byte(s))<<8;
sl@0:     x += ((uLong)get_byte(s))<<16;
sl@0:     c = get_byte(s);
sl@0:     if (c == EOF) s->z_err = Z_DATA_ERROR;
sl@0:     x += ((uLong)c)<<24;
sl@0:     return x;
sl@0: }
sl@0: 
sl@0: /* ===========================================================================
sl@0:      Flushes all pending output if necessary, closes the compressed file
sl@0:    and deallocates all the (de)compression state.
sl@0: */
sl@0: EXPORT_C int ZEXPORT gzclose (
sl@0:     gzFile file)
sl@0: {
sl@0:     int err;
sl@0:     gz_stream *s = (gz_stream*)file;
sl@0: 
sl@0:     if (s == NULL) return Z_STREAM_ERROR;
sl@0: 
sl@0:     if (s->mode == 'w') {
sl@0: #ifdef NO_DEFLATE
sl@0: 	return Z_STREAM_ERROR;
sl@0: #else
sl@0:         err = do_flush (file, Z_FINISH);
sl@0:         if (err != Z_OK) return destroy((gz_stream*)file);
sl@0: 
sl@0:         putLong (s->file, s->crc);
sl@0:         putLong (s->file, s->stream.total_in);
sl@0: #endif
sl@0:     }
sl@0:     return destroy((gz_stream*)file);
sl@0: }
sl@0: 
sl@0: /* ===========================================================================
sl@0:      Returns the error message for the last error which occured on the
sl@0:    given compressed file. errnum is set to zlib error number. If an
sl@0:    error occured in the file system and not in the compression library,
sl@0:    errnum is set to Z_ERRNO and the application may consult errno
sl@0:    to get the exact error code.
sl@0: */
sl@0: EXPORT_C const char*  ZEXPORT gzerror (
sl@0:     gzFile file,
sl@0:     int *errnum)
sl@0: {
sl@0:     char *m;
sl@0:     gz_stream *s = (gz_stream*)file;
sl@0: 
sl@0:     if (s == NULL) {
sl@0:         *errnum = Z_STREAM_ERROR;
sl@0:         return (const char*)ERR_MSG(Z_STREAM_ERROR);
sl@0:     }
sl@0:     *errnum = s->z_err;
sl@0:     if (*errnum == Z_OK) return (const char*)"";
sl@0: 
sl@0:     m =  (char*)(*errnum == Z_ERRNO ? zstrerror(errno) : s->stream.msg);
sl@0: 
sl@0:     if (m == NULL || *m == '\0') m = (char*)ERR_MSG(s->z_err);
sl@0: 
sl@0:     TRYFREE(s->msg);
sl@0:     s->msg = (char*)ALLOC(strlen(s->path) + strlen(m) + 3);
sl@0:     strcpy(s->msg, s->path);
sl@0:     strcat(s->msg, ": ");
sl@0:     strcat(s->msg, m);
sl@0:     return (const char*)s->msg;
sl@0: }