static int
unzip_seek_helper (FILE *file, int offset)
{
char buffer[MAXBUFSIZE];
int n, tmp, pos = unztell (file); // returns ftell() of the "current file"
if (pos == offset)
return 0;
else if (pos > offset)
{
unzCloseCurrentFile (file);
unzip_goto_file (file, unzip_current_file_nr);
unzOpenCurrentFile (file);
pos = 0;
}
n = offset - pos;
while (n > 0 && !unzeof (file))
{
tmp = unzReadCurrentFile (file, buffer, n > MAXBUFSIZE ? MAXBUFSIZE : n);
if (tmp < 0)
return -1;
n -= tmp;
}
return n > 0 ? -1 : 0;
}
long
ftell2 (FILE *file)
{
#undef ftell
fmode2_t fmode = get_fmode (file);
if (fmode == FM_NORMAL)
return ftell (file);
else if (fmode == FM_GZIP)
return gztell (file);
else if (fmode == FM_ZIP)
return unztell (file); // returns ftell() of the "current file"
else
return -1;
#define ftell ftell2
}
/*
* Returns -1 if an error occurs.
*/
int
FS_Tell(fileHandle_t f)
{
fsHandle_t *handle;
handle = FS_GetFileByHandle(f);
if (handle->file)
{
return ftell(handle->file);
}
#ifdef ZIP
else if (handle->zip)
{
return unztell(handle->zip);
}
#endif
return -1;
}
/*
=================
idFile_InZip::Tell
=================
*/
int idFile_InZip::Tell( void ) {
return unztell( z );
}
static int Tell(ngeVF *f) {
ngeVFZip* zip = (ngeVFZip*)f;
return unztell(zip->file);
}
size_t FileAccessZip::get_pos() const {
ERR_FAIL_COND_V(!zfile, 0);
return unztell(zfile);
};
void
FS_Seek(fileHandle_t f, int offset, fsOrigin_t origin)
{
#ifdef ZIP
byte dummy[0x8000]; /* Dummy buffer to skip bytes. */
int len; /* Length of byte chunk to skip. */
int r; /* Number of bytes read. */
int remaining = 0; /* Remaining bytes to skip. */
unz_file_info info; /* ZIP information. */
#endif
fsHandle_t *handle; /* File handle. */
handle = FS_GetFileByHandle(f);
if (handle->file)
{
switch (origin)
{
case FS_SEEK_SET:
fseek(handle->file, offset, SEEK_SET);
break;
case FS_SEEK_CUR:
fseek(handle->file, offset, SEEK_CUR);
break;
case FS_SEEK_END:
fseek(handle->file, offset, SEEK_END);
break;
default:
Com_Error(ERR_FATAL, "FS_Seek: bad origin (%i)", origin);
break;
}
}
#ifdef ZIP
else if (handle->zip)
{
switch (origin)
{
case FS_SEEK_SET:
remaining = offset;
break;
case FS_SEEK_CUR:
remaining = offset + unztell(handle->zip);
break;
case FS_SEEK_END:
unzGetCurrentFileInfo(handle->zip,
&info,
NULL,
0,
NULL,
0,
NULL,
0);
remaining = offset + info.uncompressed_size;
break;
default:
Com_Error(ERR_FATAL, "FS_Seek: bad origin (%i)", origin);
break;
}
/* Reopen the file. */
unzCloseCurrentFile(handle->zip);
unzOpenCurrentFile(handle->zip);
/* Skip until the desired offset is reached. */
while (remaining)
{
len = remaining;
if (len > sizeof(dummy))
{
len = sizeof(dummy);
}
r = unzReadCurrentFile(handle->zip, dummy, len);
if (r <= 0)
{
break;
}
remaining -= r;
}
}
#endif
}
size_t unzStream::pos (void)
{
return (unztell(file));
}
int
fseek2 (FILE *file, long offset, int mode)
{
#undef fseek
st_finfo_t *finfo = get_finfo (file);
/*
// if (fmode != FM_NORMAL)
printf ("fmode = %s\n", finfo->fmode == FM_NORMAL ? "FM_NORMAL" :
(finfo->fmode == FM_GZIP ? "FM_GZIP" :
(finfo->fmode == FM_ZIP ? "FM_ZIP" : "FM_UNDEF")));
*/
if (finfo->fmode == FM_NORMAL)
return fseek (file, offset, mode);
else if (finfo->fmode == FM_GZIP)
{
if (mode == SEEK_END) // zlib doesn't support SEEK_END
{
// Note that this is _slow_...
while (!gzeof (file))
{
gzgetc (file); // necessary for _uncompressed_ files in order to set EOF
gzseek (file, 1024 * 1024, SEEK_CUR);
}
offset += gztell (file);
mode = SEEK_SET;
}
/*
F*****G zlib documentation! It took me around 4 hours of debugging time
to find out that the doc is wrong! From the doc:
gzrewind(file) is equivalent to (int)gzseek(file, 0L, SEEK_SET)
That is not true for uncompressed files. gzrewind() doesn't change the
file pointer for uncompressed files in the ports I tested (zlib 1.1.3,
DJGPP, Cygwin & GNU/Linux). It clears the EOF indicator.
*/
if (!finfo->compressed)
gzrewind (file);
return gzseek (file, offset, mode) == -1 ? -1 : 0;
}
else if (finfo->fmode == FM_ZIP)
{
int base;
if (mode != SEEK_SET && mode != SEEK_CUR && mode != SEEK_END)
{
errno = EINVAL;
return -1;
}
if (mode == SEEK_SET)
base = 0;
else if (mode == SEEK_CUR)
base = unztell (file);
else // mode == SEEK_END
{
unz_file_info info;
unzip_goto_file (file, unzip_current_file_nr);
unzGetCurrentFileInfo (file, &info, NULL, 0, NULL, 0, NULL, 0);
base = info.uncompressed_size;
}
return unzip_seek_helper (file, base + offset);
}
return -1;
#define fseek fseek2
}
nglFileOffset nglZipFS::GetPos(void* pUnzip) const
{
unzSetCurrentFile(mpPrivate->mZip, pUnzip);
return unztell(mpPrivate->mZip);
}
