Campbell Barton
c434782e3a
Use a shorter/simpler license convention, stops the header taking so much space. Follow the SPDX license specification: https://spdx.org/licenses - C/C++/objc/objc++ - Python - Shell Scripts - CMake, GNUmakefile While most of the source tree has been included - `./extern/` was left out. - `./intern/cycles` & `./intern/atomic` are also excluded because they use different header conventions. doc/license/SPDX-license-identifiers.txt has been added to list SPDX all used identifiers. See P2788 for the script that automated these edits. Reviewed By: brecht, mont29, sergey Ref D14069
93 lines
2.0 KiB
C
93 lines
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later
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* Copyright 2004-2021 Blender Foundation. All rights reserved. */
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/** \file
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* \ingroup bli
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*/
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#include <zlib.h>
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#include "BLI_blenlib.h"
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#include "BLI_filereader.h"
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#include "MEM_guardedalloc.h"
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typedef struct {
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FileReader reader;
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FileReader *base;
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z_stream strm;
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void *in_buf;
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size_t in_size;
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} GzipReader;
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static ssize_t gzip_read(FileReader *reader, void *buffer, size_t size)
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{
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GzipReader *gzip = (GzipReader *)reader;
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gzip->strm.avail_out = size;
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gzip->strm.next_out = buffer;
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while (gzip->strm.avail_out > 0) {
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if (gzip->strm.avail_in == 0) {
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/* Ran out of buffered input data, read some more. */
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size_t readsize = gzip->base->read(gzip->base, gzip->in_buf, gzip->in_size);
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if (readsize > 0) {
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/* We got some data, so mark the buffer as refilled. */
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gzip->strm.avail_in = readsize;
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gzip->strm.next_in = gzip->in_buf;
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}
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else {
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/* The underlying file is EOF, so return as much as we can. */
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break;
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}
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}
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int ret = inflate(&gzip->strm, Z_NO_FLUSH);
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if (!ELEM(ret, Z_OK, Z_BUF_ERROR)) {
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break;
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}
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}
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ssize_t read_len = size - gzip->strm.avail_out;
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gzip->reader.offset += read_len;
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return read_len;
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}
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static void gzip_close(FileReader *reader)
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{
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GzipReader *gzip = (GzipReader *)reader;
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if (inflateEnd(&gzip->strm) != Z_OK) {
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printf("close gzip stream error\n");
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}
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MEM_freeN((void *)gzip->in_buf);
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gzip->base->close(gzip->base);
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MEM_freeN(gzip);
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}
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FileReader *BLI_filereader_new_gzip(FileReader *base)
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{
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GzipReader *gzip = MEM_callocN(sizeof(GzipReader), __func__);
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gzip->base = base;
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if (inflateInit2(&gzip->strm, 16 + MAX_WBITS) != Z_OK) {
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MEM_freeN(gzip);
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return NULL;
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}
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gzip->in_size = 256 * 2014;
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gzip->in_buf = MEM_mallocN(gzip->in_size, "gzip in buf");
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gzip->reader.read = gzip_read;
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gzip->reader.seek = NULL;
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gzip->reader.close = gzip_close;
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return (FileReader *)gzip;
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}
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