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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* The Original Code is Copyright (C) 2004-2021 Blender Foundation
* All rights reserved.
*/
/** \file
* \ingroup bli
*/
#include <zlib.h>
#include "BLI_blenlib.h"
#include "BLI_filereader.h"
#include "MEM_guardedalloc.h"
typedef struct {
FileReader reader;
FileReader *base;
z_stream strm;
void *in_buf;
size_t in_size;
} GzipReader;
static ssize_t gzip_read(FileReader *reader, void *buffer, size_t size)
{
GzipReader *gzip = (GzipReader *)reader;
gzip->strm.avail_out = size;
gzip->strm.next_out = buffer;
while (gzip->strm.avail_out > 0) {
if (gzip->strm.avail_in == 0) {
/* Ran out of buffered input data, read some more. */
size_t readsize = gzip->base->read(gzip->base, gzip->in_buf, gzip->in_size);
if (readsize > 0) {
/* We got some data, so mark the buffer as refilled. */
gzip->strm.avail_in = readsize;
gzip->strm.next_in = gzip->in_buf;
}
else {
/* The underlying file is EOF, so return as much as we can. */
break;
}
}
int ret = inflate(&gzip->strm, Z_NO_FLUSH);
if (ret != Z_OK && ret != Z_BUF_ERROR) {
break;
}
}
ssize_t read_len = size - gzip->strm.avail_out;
gzip->reader.offset += read_len;
return read_len;
}
static void gzip_close(FileReader *reader)
{
GzipReader *gzip = (GzipReader *)reader;
if (inflateEnd(&gzip->strm) != Z_OK) {
printf("close gzip stream error\n");
}
MEM_freeN((void *)gzip->in_buf);
gzip->base->close(gzip->base);
MEM_freeN(gzip);
}
FileReader *BLI_filereader_new_gzip(FileReader *base)
{
GzipReader *gzip = MEM_callocN(sizeof(GzipReader), __func__);
gzip->base = base;
if (inflateInit2(&gzip->strm, 16 + MAX_WBITS) != Z_OK) {
MEM_freeN(gzip);
return NULL;
}
gzip->in_size = 256 * 2014;
gzip->in_buf = MEM_mallocN(gzip->in_size, "gzip in buf");
gzip->reader.read = gzip_read;
gzip->reader.seek = NULL;
gzip->reader.close = gzip_close;
return (FileReader *)gzip;
}
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