gzio.c

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		s->transparent = 1;
	    }
	    s->z_err = s->stream.avail_in != 0 ? Z_OK : Z_STREAM_END;
	    return;
	}
    }
    method = get_byte(s);
    flags = get_byte(s);
    if (method != Z_DEFLATED || (flags & RESERVED) != 0) {
	s->z_err = Z_DATA_ERROR;
	return;
    }

    /* Discard time, xflags and OS code: */
    for (len = 0; len < 6; len++) (void)get_byte(s);

    if ((flags & EXTRA_FIELD) != 0) { /* skip the extra field */
	len  =  (uInt)get_byte(s);
	len += ((uInt)get_byte(s))<<8;
	/* len is garbage if EOF but the loop below will quit anyway */
	while (len-- != 0 && get_byte(s) != EOF) ;
    }
    if ((flags & ORIG_NAME) != 0) { /* skip the original file name */
	while ((c = get_byte(s)) != 0 && c != EOF) ;
    }
    if ((flags & COMMENT) != 0) {   /* skip the .gz file comment */
	while ((c = get_byte(s)) != 0 && c != EOF) ;
    }
    if ((flags & HEAD_CRC) != 0) {  /* skip the header crc */
	for (len = 0; len < 2; len++) (void)get_byte(s);
    }
    s->z_err = s->z_eof ? Z_DATA_ERROR : Z_OK;
}

 /* ===========================================================================
 * Cleanup then free the given gz_stream. Return a zlib error code.
   Try freeing in the reverse order of allocations.
 */
local int destroy (s)
    gz_stream *s;
{
    int err = Z_OK;

    if (!s) return Z_STREAM_ERROR;

    TRYFREE(s->msg);

    if (s->stream.state != NULL) {
	if (s->mode == 'w') {
#ifdef NO_DEFLATE
	    err = Z_STREAM_ERROR;
#else
	    err = deflateEnd(&(s->stream));
#endif
	} else if (s->mode == 'r') {
	    err = inflateEnd(&(s->stream));
	}
    }
#ifdef _WIN32_WCE
    if (s->file != NULL && !CloseHandle(s->file)) {
#else
    if (s->file != NULL && fclose(s->file)) {
#ifdef ESPIPE
	if (errno != ESPIPE) /* fclose is broken for pipes in HP/UX */
#endif
#endif
	    err = Z_ERRNO;
    }
    if (s->z_err < 0) err = s->z_err;

    TRYFREE(s->inbuf);
    TRYFREE(s->outbuf);
    TRYFREE(s->path);
    TRYFREE(s);
    return err;
}

/* ===========================================================================
     Reads the given number of uncompressed bytes from the compressed file.
   gzread returns the number of bytes actually read (0 for end of file).
*/
int ZEXPORT gzread (file, buf, len)
    gzFile file;
    voidp buf;
    unsigned len;
{
    gz_stream *s = (gz_stream*)file;
    Bytef *start = (Bytef*)buf; /* starting point for crc computation */
    Byte  *next_out; /* == stream.next_out but not forced far (for MSDOS) */
#ifdef _WIN32_WCE
    DWORD size;
#endif

    if (s == NULL || s->mode != 'r') return Z_STREAM_ERROR;

    if (s->z_err == Z_DATA_ERROR || s->z_err == Z_ERRNO) return -1;
    if (s->z_err == Z_STREAM_END) return 0;  /* EOF */

    next_out = (Byte*)buf;
    s->stream.next_out = (Bytef*)buf;
    s->stream.avail_out = len;

    while (s->stream.avail_out != 0) {

	if (s->transparent) {
	    /* Copy first the lookahead bytes: */
	    uInt n = s->stream.avail_in;
	    if (n > s->stream.avail_out) n = s->stream.avail_out;
	    if (n > 0) {
		zmemcpy(s->stream.next_out, s->stream.next_in, n);
		next_out += n;
		s->stream.next_out = next_out;
		s->stream.next_in   += n;
		s->stream.avail_out -= n;
		s->stream.avail_in  -= n;
	    }
	    if (s->stream.avail_out > 0) {
#ifdef _WIN32_WCE
                if (ReadFile(s->file, next_out, s->stream.avail_out, &size, NULL)) {
                    s->stream.avail_out -= size;
                }
#else
		s->stream.avail_out -= fread(next_out, 1, s->stream.avail_out,
					     s->file);
#endif
	    }
	    len -= s->stream.avail_out;
	    s->stream.total_in  += (uLong)len;
	    s->stream.total_out += (uLong)len;
            if (len == 0) s->z_eof = 1;
	    return (int)len;
	}
        if (s->stream.avail_in == 0 && !s->z_eof) {

#ifdef _WIN32_WCE
            SetLastError(NO_ERROR);
            if (!ReadFile(s->file, s->inbuf, Z_BUFSIZE, &s->stream.avail_in, NULL)) {
                s->z_eof = 1;
                s->z_err = Z_ERRNO;
                break;
            }
            if (s->stream.avail_in == 0) {
                s->z_eof = 1;
            }
#else
            errno = 0;
            s->stream.avail_in = fread(s->inbuf, 1, Z_BUFSIZE, s->file);
            if (s->stream.avail_in == 0) {
                s->z_eof = 1;
		if (ferror(s->file)) {
		    s->z_err = Z_ERRNO;
		    break;
		}
            }
#endif
            s->stream.next_in = s->inbuf;
        }
        s->z_err = inflate(&(s->stream), Z_NO_FLUSH);

	if (s->z_err == Z_STREAM_END) {
	    /* Check CRC and original size */
	    s->crc = crc32(s->crc, start, (uInt)(s->stream.next_out - start));
	    start = s->stream.next_out;

	    if (getLong(s) != s->crc) {
		s->z_err = Z_DATA_ERROR;
	    } else {
	        (void)getLong(s);
                /* The uncompressed length returned by above getlong() may
                 * be different from s->stream.total_out) in case of
		 * concatenated .gz files. Check for such files:
		 */
		check_header(s);
		if (s->z_err == Z_OK) {
		    uLong total_in = s->stream.total_in;
		    uLong total_out = s->stream.total_out;

		    inflateReset(&(s->stream));
		    s->stream.total_in = total_in;
		    s->stream.total_out = total_out;
		    s->crc = crc32(0L, Z_NULL, 0);
		}
	    }
	}
	if (s->z_err != Z_OK || s->z_eof) break;
    }
    s->crc = crc32(s->crc, start, (uInt)(s->stream.next_out - start));

    return (int)(len - s->stream.avail_out);
}


/* ===========================================================================
      Reads one byte from the compressed file. gzgetc returns this byte
   or -1 in case of end of file or error.
*/
int ZEXPORT gzgetc(file)
    gzFile file;
{
    unsigned char c;

    return gzread(file, &c, 1) == 1 ? c : -1;
}


/* ===========================================================================
      Reads bytes from the compressed file until len-1 characters are
   read, or a newline character is read and transferred to buf, or an
   end-of-file condition is encountered.  The string is then terminated
   with a null character.
      gzgets returns buf, or Z_NULL in case of error.

      The current implementation is not optimized at all.
*/
char * ZEXPORT gzgets(file, buf, len)
    gzFile file;
    char *buf;
    int len;
{
    char *b = buf;
    if (buf == Z_NULL || len <= 0) return Z_NULL;

    while (--len > 0 && gzread(file, buf, 1) == 1 && *buf++ != '\n') ;
    *buf = '\0';
    return b == buf && len > 0 ? Z_NULL : b;
}


#ifndef NO_DEFLATE
/* ===========================================================================
     Writes the given number of uncompressed bytes into the compressed file.
   gzwrite returns the number of bytes actually written (0 in case of error).
*/
int ZEXPORT gzwrite (file, buf, len)
    gzFile file;
    const voidp buf;
    unsigned len;
{
    gz_stream *s = (gz_stream*)file;
#ifdef _WIN32_WCE
    DWORD size;
#endif

    if (s == NULL || s->mode != 'w') return Z_STREAM_ERROR;

    s->stream.next_in = (Bytef*)buf;
    s->stream.avail_in = len;

    while (s->stream.avail_in != 0) {

        if (s->stream.avail_out == 0) {

            s->stream.next_out = s->outbuf;
#ifdef _WIN32_WCE
            if (!WriteFile(s->file, s->outbuf, Z_BUFSIZE, &size, NULL) || size != Z_BUFSIZE) {
#else
            if (fwrite(s->outbuf, 1, Z_BUFSIZE, s->file) != Z_BUFSIZE) {
#endif
                s->z_err = Z_ERRNO;
                break;
            }
            s->stream.avail_out = Z_BUFSIZE;
        }
        s->z_err = deflate(&(s->stream), Z_NO_FLUSH);
        if (s->z_err != Z_OK) break;
    }
    s->crc = crc32(s->crc, (const Bytef *)buf, len);

    return (int)(len - s->stream.avail_in);
}

/* ===========================================================================
     Converts, formats, and writes the args to the compressed file under
   control of the format string, as in fprintf. gzprintf returns the number of
   uncompressed bytes actually written (0 in case of error).
*/
#ifdef _WIN32_WCE
#include <stdarg.h>

int ZEXPORTVA gzprintf (gzFile file, const char *format, /* args */ ...)
{
    char buf[Z_PRINTF_BUFSIZE];
    va_list va;
    int len;
    TCHAR form[Z_PRINTF_BUFSIZE];
    TCHAR tbuf[Z_PRINTF_BUFSIZE];
    int n;

    va_start(va, format);
    MultiByteToWideChar(CP_ACP, 0, format, -1, form, Z_PRINTF_BUFSIZE);
    len = lstrlen(form);
    for ( n = 0; n < len; n++ ) {
        if ( TEXT('%') == form[n] ) {
            n++;
            if ( TEXT('c') == form[n] ) {
                form[n] = TEXT('C');
            } else if ( TEXT('s') == form[n] ) {
                form[n] = TEXT('S');
            }
        }
    }
    (void)vswprintf(tbuf, form, va);
    va_end(va);
    WideCharToMultiByte(CP_ACP, 0, tbuf, -1, buf, Z_PRINTF_BUFSIZE, NULL, NULL);
    len = strlen(buf); /* some *sprintf don't return the nb of bytes written */
    if (len <= 0) return 0;

    return gzwrite(file, buf, (unsigned)len);
}
#else
#ifdef STDC
#include <stdarg.h>

int ZEXPORTVA gzprintf (gzFile file, const char *format, /* args */ ...)
{
    char buf[Z_PRINTF_BUFSIZE];
    va_list va;
    int len;

    va_start(va, format);
#ifdef HAS_vsnprintf
    (void)vsnprintf(buf, sizeof(buf), format, va);
#else
    (void)vsprintf(buf, format, va);
#endif
    va_end(va);
    len = strlen(buf); /* some *sprintf don't return the nb of bytes written */
    if (len <= 0) return 0;

    return gzwrite(file, buf, (unsigned)len);
}
#else /* not ANSI C */

int ZEXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
	               a11, a12, a13, a14, a15, a16, a17, a18, a19, a20)
    gzFile file;
    const char *format;
    int a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
	a11, a12, a13, a14, a15, a16, a17, a18, a19, a20;
{
    char buf[Z_PRINTF_BUFSIZE];
    int len;

#ifdef HAS_snprintf
    snprintf(buf, sizeof(buf), format, a1, a2, a3, a4, a5, a6, a7, a8,
	     a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
#else
    sprintf(buf, format, a1, a2, a3, a4, a5, a6, a7, a8,
	    a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
#endif
    len = strlen(buf); /* old sprintf doesn't return the nb of bytes written */
    if (len <= 0) return 0;

    return gzwrite(file, buf, len);