/* gzio.c -- IO on .gz files
- * Copyright (C) 1995-1998 Jean-loup Gailly.
+ * Copyright (C) 1995-2002 Jean-loup Gailly.
* For conditions of distribution and use, see copyright notice in zlib.h
*
* Compile this file with -DNO_DEFLATE to avoid the compression code.
can be checked to distinguish the two cases (if errno is zero, the
zlib error is Z_MEM_ERROR).
*/
+#if defined(__VISAGECPP__) /* Visualage can't handle this antiquated interface */
+local gzFile gz_open (const char* path, const char* mode, int fd)
+#else
local gzFile gz_open (path, mode, fd)
const char *path;
const char *mode;
int fd;
+#endif
{
int err;
int level = Z_DEFAULT_COMPRESSION; /* compression level */
}
} while (*p++ && m != fmode + sizeof(fmode));
if (s->mode == '\0') return destroy(s), (gzFile)Z_NULL;
-
+
if (s->mode == 'w') {
#ifdef NO_DEFLATE
err = Z_STREAM_ERROR;
check_header(s); /* skip the .gz header */
s->startpos = (ftell(s->file) - s->stream.avail_in);
}
-
+
return (gzFile)s;
}
/* ===========================================================================
Opens a gzip (.gz) file for reading or writing.
*/
+#if defined(__VISAGECPP__) /* Visualage can't handle this antiquated interface */
+gzFile ZEXPORT gzopen (const char* path, const char* mode)
+#else
gzFile ZEXPORT gzopen (path, mode)
const char *path;
const char *mode;
+#endif
{
return gz_open (path, mode, -1);
}
Associate a gzFile with the file descriptor fd. fd is not dup'ed here
to mimic the behavio(u)r of fdopen.
*/
+#if defined(__VISAGECPP__) /* Visualage can't handle this antiquated interface */
+gzFile ZEXPORT gzdopen (int fd, const char* mode)
+#else
gzFile ZEXPORT gzdopen (fd, mode)
int fd;
const char *mode;
+#endif
{
char name[20];
/* ===========================================================================
* Update the compression level and strategy
*/
+#if defined(__VISAGECPP__) /* Visualage can't handle this antiquated interface */
+int ZEXPORT gzsetparams (gzFile file, int level, int strategy)
+#else
int ZEXPORT gzsetparams (file, level, strategy)
gzFile file;
int level;
int strategy;
+#endif
{
gz_stream *s = (gz_stream*)file;
for end of file.
IN assertion: the stream s has been sucessfully opened for reading.
*/
+#if defined(__VISAGECPP__) /* Visualage can't handle this antiquated interface */
+local int get_byte(gz_stream* s)
+#else
local int get_byte(s)
gz_stream *s;
+#endif
{
if (s->z_eof) return EOF;
if (s->stream.avail_in == 0) {
s->stream.avail_in is zero for the first time, but may be non-zero
for concatenated .gz files.
*/
+#if defined(__VISAGECPP__) /* Visualage can't handle this antiquated interface */
+local void check_header(gz_stream* s)
+#else
local void check_header(s)
gz_stream *s;
+#endif
{
int method; /* method byte */
int flags; /* flags byte */
* Cleanup then free the given gz_stream. Return a zlib error code.
Try freeing in the reverse order of allocations.
*/
+#if defined(__VISAGECPP__) /* Visualage can't handle this antiquated interface */
+local int destroy (gz_stream* s)
+#else
local int destroy (s)
gz_stream *s;
+#endif
{
int err = Z_OK;
Reads the given number of uncompressed bytes from the compressed file.
gzread returns the number of bytes actually read (0 for end of file).
*/
+#if defined(__VISAGECPP__) /* Visualage can't handle this antiquated interface */
+int ZEXPORT gzread (gzFile file, voidp buf, unsigned len)
+#else
int ZEXPORT gzread (file, buf, len)
gzFile file;
voidp buf;
unsigned len;
+#endif
{
gz_stream *s = (gz_stream*)file;
Bytef *start = (Bytef*)buf; /* starting point for crc computation */
s->crc = crc32(s->crc, start, (uInt)(s->stream.next_out - start));
start = s->stream.next_out;
- if (getLong(s) != s->crc || getLong(s) != s->stream.total_out) {
+ if (getLong(s) != s->crc) {
s->z_err = Z_DATA_ERROR;
} else {
- /* Check for concatenated .gz files: */
+ (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;
Reads one byte from the compressed file. gzgetc returns this byte
or -1 in case of end of file or error.
*/
+#if defined(__VISAGECPP__) /* Visualage can't handle this antiquated interface */
+int ZEXPORT gzgetc(gzFile file)
+#else
int ZEXPORT gzgetc(file)
gzFile file;
+#endif
{
unsigned char c;
The current implementation is not optimized at all.
*/
+#if defined(__VISAGECPP__) /* Visualage can't handle this antiquated interface */
+char* ZEXPORT gzgets(gzFile file, char* buf, int len)
+#else
char * ZEXPORT gzgets(file, buf, len)
gzFile file;
char *buf;
int len;
+#endif
{
char *b = buf;
if (buf == Z_NULL || len <= 0) return Z_NULL;
Writes the given number of uncompressed bytes into the compressed file.
gzwrite returns the number of bytes actually written (0 in case of error).
*/
+#if defined(__VISAGECPP__) /* Visualage can't handle this antiquated interface */
+int ZEXPORT gzwrite (gzFile file, const voidp buf, unsigned len)
+#else
int ZEXPORT gzwrite (file, buf, len)
gzFile file;
const voidp buf;
unsigned len;
+#endif
{
gz_stream *s = (gz_stream*)file;
}
#else /* not ANSI C */
+#if defined(__VISAGECPP__) /* Visualage can't handle this antiquated interface */
+int ZEXPORTVA gzprintf (gzFile file const char* format, int a1, int a2, int a3, int a4,
+ int a5, int a6, int a7, int a8, int a9, int a10, int a11, int a12
+ int a13, int a14, int a15, int a16, int a17, int a18, int a19, int a20)
+#else
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;
+#endif
{
char buf[Z_PRINTF_BUFSIZE];
int len;
Writes c, converted to an unsigned char, into the compressed file.
gzputc returns the value that was written, or -1 in case of error.
*/
+#if defined(__VISAGECPP__) /* Visualage can't handle this antiquated interface */
+int ZEXPORT gzputc(gzFile file, int c)
+#else
int ZEXPORT gzputc(file, c)
gzFile file;
int c;
+#endif
{
unsigned char cc = (unsigned char) c; /* required for big endian systems */
the terminating null character.
gzputs returns the number of characters written, or -1 in case of error.
*/
+#if defined(__VISAGECPP__) /* Visualage can't handle this antiquated interface */
+int ZEXPORT gzputs(gzFile file, const char* s)
+#else
int ZEXPORT gzputs(file, s)
gzFile file;
const char *s;
+#endif
{
return gzwrite(file, (char*)s, (unsigned)strlen(s));
}
Flushes all pending output into the compressed file. The parameter
flush is as in the deflate() function.
*/
+#if defined(__VISAGECPP__) /* Visualage can't handle this antiquated interface */
+local int do_flush (gzFile file, int flush)
+#else
local int do_flush (file, flush)
gzFile file;
int flush;
+#endif
{
uInt len;
int done = 0;
if (len == 0 && s->z_err == Z_BUF_ERROR) s->z_err = Z_OK;
/* deflate has finished flushing only when it hasn't used up
- * all the available space in the output buffer:
+ * all the available space in the output buffer:
*/
done = (s->stream.avail_out != 0 || s->z_err == Z_STREAM_END);
-
+
if (s->z_err != Z_OK && s->z_err != Z_STREAM_END) break;
}
return s->z_err == Z_STREAM_END ? Z_OK : s->z_err;
}
+#if defined(__VISAGECPP__) /* Visualage can't handle this antiquated interface */
+int ZEXPORT gzflush (gzFile file, int flush)
+#else
int ZEXPORT gzflush (file, flush)
gzFile file;
int flush;
+#endif
{
gz_stream *s = (gz_stream*)file;
int err = do_flush (file, flush);
SEEK_END is not implemented, returns error.
In this version of the library, gzseek can be extremely slow.
*/
+#if defined(__VISAGECPP__) /* Visualage can't handle this antiquated interface */
+z_off_t ZEXPORT gzseek (gzFile file, z_off_t offset, int whence)
+#else
z_off_t ZEXPORT gzseek (file, offset, whence)
gzFile file;
z_off_t offset;
int whence;
+#endif
{
gz_stream *s = (gz_stream*)file;
s->z_err == Z_ERRNO || s->z_err == Z_DATA_ERROR) {
return -1L;
}
-
+
if (s->mode == 'w') {
#ifdef NO_DEFLATE
return -1L;
#else
if (whence == SEEK_SET) {
- offset -= s->stream.total_out;
+ offset -= s->stream.total_in;
}
if (offset < 0) return -1L;
}
/* ===========================================================================
- Rewinds input file.
+ Rewinds input file.
*/
+#if defined(__VISAGECPP__) /* Visualage can't handle this antiquated interface */
+int ZEXPORT gzrewind (gzFile file)
+#else
int ZEXPORT gzrewind (file)
gzFile file;
+#endif
{
gz_stream *s = (gz_stream*)file;
-
+
if (s == NULL || s->mode != 'r') return -1;
s->z_err = Z_OK;
s->z_eof = 0;
s->stream.avail_in = 0;
s->stream.next_in = s->inbuf;
+ s->crc = crc32(0L, Z_NULL, 0);
if (s->startpos == 0) { /* not a compressed file */
rewind(s->file);
given compressed file. This position represents a number of bytes in the
uncompressed data stream.
*/
+#if defined(__VISAGECPP__) /* Visualage can't handle this antiquated interface */
+z_off_t ZEXPORT gztell (gzFile file)
+#else
z_off_t ZEXPORT gztell (file)
gzFile file;
+#endif
{
return gzseek(file, 0L, SEEK_CUR);
}
Returns 1 when EOF has previously been detected reading the given
input stream, otherwise zero.
*/
+#if defined(__VISAGECPP__) /* Visualage can't handle this antiquated interface */
+int ZEXPORT gzeof (gzFile file)
+#else
int ZEXPORT gzeof (file)
gzFile file;
+#endif
{
gz_stream *s = (gz_stream*)file;
-
+
return (s == NULL || s->mode != 'r') ? 0 : s->z_eof;
}
/* ===========================================================================
Outputs a long in LSB order to the given file
*/
+#if defined(__VISAGECPP__) /* Visualage can't handle this antiquated interface */
+local void putLong (FILE* file, uLong x)
+#else
local void putLong (file, x)
FILE *file;
uLong x;
+#endif
{
int n;
for (n = 0; n < 4; n++) {
}
/* ===========================================================================
- Reads a long in LSB order from the given gz_stream. Sets
+ Reads a long in LSB order from the given gz_stream. Sets z_err in case
+ of error.
*/
+#if defined(__VISAGECPP__) /* Visualage can't handle this antiquated interface */
+local uLong getLong (gz_stream* s)
+#else
local uLong getLong (s)
gz_stream *s;
+#endif
{
uLong x = (uLong)get_byte(s);
int c;
Flushes all pending output if necessary, closes the compressed file
and deallocates all the (de)compression state.
*/
+#if defined(__VISAGECPP__) /* Visualage can't handle this antiquated interface */
+int ZEXPORT gzclose (gzFile file)
+#else
int ZEXPORT gzclose (file)
gzFile file;
+#endif
{
int err;
gz_stream *s = (gz_stream*)file;
errnum is set to Z_ERRNO and the application may consult errno
to get the exact error code.
*/
+#if defined(__VISAGECPP__) /* Visualage can't handle this antiquated interface */
+const char* ZEXPORT gzerror (gzFile file, int* errnum)
+#else
const char* ZEXPORT gzerror (file, errnum)
gzFile file;
int *errnum;
+#endif
{
char *m;
gz_stream *s = (gz_stream*)file;
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