static MojoInput *make_gzip_input(MojoInput *origio)
{
MojoInput *io = NULL;
GZIPinfo *info = (GZIPinfo *) xmalloc(sizeof (GZIPinfo));
initializeZStream(&info->stream);
if (inflateInit2(&info->stream, 31) != Z_OK)
{
free(info);
return NULL;
} // if
info->origio = origio;
io = (MojoInput *) xmalloc(sizeof (MojoInput));
io->ready = MojoInput_gzip_ready;
io->read = MojoInput_gzip_read;
io->seek = MojoInput_gzip_seek;
io->tell = MojoInput_gzip_tell;
io->length = MojoInput_gzip_length;
io->duplicate = MojoInput_gzip_duplicate;
io->close = MojoInput_gzip_close;
io->opaque = info;
return io;
} // make_gzip_input
static int HHA_seek(fvoid *opaque, PHYSFS_uint64 offset)
{
HHAfileinfo *finfo = (HHAfileinfo *) opaque;
HHAentry *entry = finfo->entry;
void *in = finfo->handle;
BAIL_IF_MACRO(offset < 0, ERR_INVALID_ARGUMENT, 0);
BAIL_IF_MACRO(offset >= entry->uncompressed_size, ERR_PAST_EOF, 0);
if (entry->compress == HHA_COMPRESS_NONE)
{
PHYSFS_sint64 newpos = offset + entry->offset;
BAIL_IF_MACRO(!__PHYSFS_platformSeek(in, newpos), NULL, 0);
finfo->uncompressed_position = (PHYSFS_uint32) offset;
}
else if (entry->compress == HHA_COMPRESS_ZLIB)
{
/*
* If seeking backwards, we need to redecode the file
* from the start and throw away the compressed bits until we hit
* the offset we need. If seeking forward, we still need to
* decode, but we don't rewind first.
*/
if (offset < finfo->uncompressed_position)
{
/* we do a copy so state is sane if inflateInit2() fails. */
z_stream str;
initializeZStream(&str);
if (zlib_err(inflateInit2(&str, -MAX_WBITS)) != Z_OK)
return(0);
if (!__PHYSFS_platformSeek(in, entry->offset))
return(0);
inflateEnd(&finfo->zlib_stream);
memcpy(&finfo->zlib_stream, &str, sizeof (z_stream));
finfo->uncompressed_position = finfo->compressed_position = 0;
} /* if */
while (finfo->uncompressed_position != offset)
{
PHYSFS_uint8 buf[512];
PHYSFS_uint32 maxread;
maxread = (PHYSFS_uint32) (offset - finfo->uncompressed_position);
if (maxread > sizeof (buf))
maxread = sizeof (buf);
if (HHA_read(finfo, buf, maxread, 1) != 1)
return(0);
} /* while */
} /* else */
else
printf("LZMA file: %s/%s\n", entry->dir, entry->name);
return(1);
} /* HHA_seek */
static int ZIP_seek(fvoid *opaque, PHYSFS_uint64 offset)
{
ZIPfileinfo *finfo = (ZIPfileinfo *) opaque;
ZIPentry *entry = finfo->entry;
void *in = finfo->handle;
BAIL_IF_MACRO(offset > entry->uncompressed_size, ERR_PAST_EOF, 0);
if (entry->compression_method == COMPMETH_NONE)
{
PHYSFS_sint64 newpos = offset + entry->offset;
BAIL_IF_MACRO(!__PHYSFS_platformSeek(in, newpos), NULL, 0);
finfo->uncompressed_position = (PHYSFS_uint32) offset;
} /* if */
else
{
/*
* If seeking backwards, we need to redecode the file
* from the start and throw away the compressed bits until we hit
* the offset we need. If seeking forward, we still need to
* decode, but we don't rewind first.
*/
if (offset < finfo->uncompressed_position)
{
/* we do a copy so state is sane if inflateInit2() fails. */
z_stream str;
initializeZStream(&str);
if (zlib_err(inflateInit2(&str, -MAX_WBITS)) != Z_OK)
return(0);
if (!__PHYSFS_platformSeek(in, entry->offset))
return(0);
inflateEnd(&finfo->stream);
memcpy(&finfo->stream, &str, sizeof (z_stream));
finfo->uncompressed_position = finfo->compressed_position = 0;
} /* if */
while (finfo->uncompressed_position != offset)
{
PHYSFS_uint8 buf[512];
PHYSFS_uint32 maxread;
maxread = (PHYSFS_uint32) (offset - finfo->uncompressed_position);
if (maxread > sizeof (buf))
maxread = sizeof (buf);
if (ZIP_read(finfo, buf, maxread, 1) != 1)
return(0);
} /* while */
} /* else */
return(1);
} /* ZIP_seek */
static fvoid *HHA_openRead(dvoid *opaque, const char *fnm, int *fileExists)
{
HHAinfo *info = (HHAinfo *) opaque;
HHAfileinfo *finfo;
HHAentry *entry;
entry = HHA_find_entry(info, fnm);
*fileExists = (entry != NULL);
BAIL_IF_MACRO(entry == NULL, NULL, NULL);
finfo = (HHAfileinfo *) allocator.Malloc(sizeof (HHAfileinfo));
BAIL_IF_MACRO(finfo == NULL, ERR_OUT_OF_MEMORY, NULL);
memset(finfo, '\0', sizeof (HHAfileinfo));
finfo->handle = __PHYSFS_platformOpenRead(info->filename);
if ( (finfo->handle == NULL) ||
(!__PHYSFS_platformSeek(finfo->handle, entry->offset)) )
{
allocator.Free(finfo);
return(NULL);
} /* if */
finfo->entry = entry;
if (finfo->entry->compress == HHA_COMPRESS_ZLIB)
{
initializeZStream(&finfo->zlib_stream);
if (zlib_err(inflateInit2(&finfo->zlib_stream, -MAX_WBITS)) != Z_OK)
{
HHA_fileClose(finfo);
return(NULL);
} /* if */
finfo->buffer = (PHYSFS_uint8 *) allocator.Malloc(ZIP_READBUFSIZE);
if (finfo->buffer == NULL)
{
HHA_fileClose(finfo);
BAIL_MACRO(ERR_OUT_OF_MEMORY, NULL);
} /* if */
} /* if */
return(finfo);
} /* HHA_openRead */
static boolean MojoInput_gzip_seek(MojoInput *io, uint64 offset)
{
// This is all really expensive.
GZIPinfo *info = (GZIPinfo *) io->opaque;
/*
* If seeking backwards, we need to redecode the file
* from the start and throw away the compressed bits until we hit
* the offset we need. If seeking forward, we still need to
* decode, but we don't rewind first.
*/
if (offset < info->uncompressed_position)
{
if (!info->origio->seek(info->origio, 0))
return false;
inflateEnd(&info->stream);
initializeZStream(&info->stream);
if (inflateInit2(&info->stream, 31) != Z_OK)
return false;
info->uncompressed_position = 0;
} // if
while (info->uncompressed_position != offset)
{
uint8 buf[512];
uint32 maxread;
int64 br;
maxread = (uint32) (offset - info->uncompressed_position);
if (maxread > sizeof (buf))
maxread = sizeof (buf);
br = io->read(io, buf, maxread);
if (br != maxread)
return false;
} /* while */
return true;
} // MojoInput_gzip_seek
