godot/core/io/compression.cpp
2019-01-03 22:35:20 -02:00

193 lines
6.3 KiB
C++

/*************************************************************************/
/* compression.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md) */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#include "compression.h"
#include "core/io/zip_io.h"
#include "core/os/copymem.h"
#include "core/project_settings.h"
#include "thirdparty/misc/fastlz.h"
#include <zlib.h>
#include <zstd.h>
int Compression::compress(uint8_t *p_dst, const uint8_t *p_src, int p_src_size, Mode p_mode) {
switch (p_mode) {
case MODE_FASTLZ: {
if (p_src_size < 16) {
uint8_t src[16];
zeromem(&src[p_src_size], 16 - p_src_size);
copymem(src, p_src, p_src_size);
return fastlz_compress(src, 16, p_dst);
} else {
return fastlz_compress(p_src, p_src_size, p_dst);
}
} break;
case MODE_DEFLATE:
case MODE_GZIP: {
int window_bits = p_mode == MODE_DEFLATE ? 15 : 15 + 16;
z_stream strm;
strm.zalloc = zipio_alloc;
strm.zfree = zipio_free;
strm.opaque = Z_NULL;
int level = p_mode == MODE_DEFLATE ? zlib_level : gzip_level;
int err = deflateInit2(&strm, level, Z_DEFLATED, window_bits, 8, Z_DEFAULT_STRATEGY);
if (err != Z_OK)
return -1;
strm.avail_in = p_src_size;
int aout = deflateBound(&strm, p_src_size);
strm.avail_out = aout;
strm.next_in = (Bytef *)p_src;
strm.next_out = p_dst;
deflate(&strm, Z_FINISH);
aout = aout - strm.avail_out;
deflateEnd(&strm);
return aout;
} break;
case MODE_ZSTD: {
ZSTD_CCtx *cctx = ZSTD_createCCtx();
ZSTD_CCtx_setParameter(cctx, ZSTD_c_compressionLevel, zstd_level);
if (zstd_long_distance_matching) {
ZSTD_CCtx_setParameter(cctx, ZSTD_c_enableLongDistanceMatching, 1);
ZSTD_CCtx_setParameter(cctx, ZSTD_c_windowLog, zstd_window_log_size);
}
int max_dst_size = get_max_compressed_buffer_size(p_src_size, MODE_ZSTD);
int ret = ZSTD_compressCCtx(cctx, p_dst, max_dst_size, p_src, p_src_size, zstd_level);
ZSTD_freeCCtx(cctx);
return ret;
} break;
}
ERR_FAIL_V(-1);
}
int Compression::get_max_compressed_buffer_size(int p_src_size, Mode p_mode) {
switch (p_mode) {
case MODE_FASTLZ: {
int ss = p_src_size + p_src_size * 6 / 100;
if (ss < 66)
ss = 66;
return ss;
} break;
case MODE_DEFLATE:
case MODE_GZIP: {
int window_bits = p_mode == MODE_DEFLATE ? 15 : 15 + 16;
z_stream strm;
strm.zalloc = zipio_alloc;
strm.zfree = zipio_free;
strm.opaque = Z_NULL;
int err = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, Z_DEFLATED, window_bits, 8, Z_DEFAULT_STRATEGY);
if (err != Z_OK)
return -1;
int aout = deflateBound(&strm, p_src_size);
deflateEnd(&strm);
return aout;
} break;
case MODE_ZSTD: {
return ZSTD_compressBound(p_src_size);
} break;
}
ERR_FAIL_V(-1);
}
int Compression::decompress(uint8_t *p_dst, int p_dst_max_size, const uint8_t *p_src, int p_src_size, Mode p_mode) {
switch (p_mode) {
case MODE_FASTLZ: {
int ret_size = 0;
if (p_dst_max_size < 16) {
uint8_t dst[16];
ret_size = fastlz_decompress(p_src, p_src_size, dst, 16);
copymem(p_dst, dst, p_dst_max_size);
} else {
ret_size = fastlz_decompress(p_src, p_src_size, p_dst, p_dst_max_size);
}
return ret_size;
} break;
case MODE_DEFLATE:
case MODE_GZIP: {
int window_bits = p_mode == MODE_DEFLATE ? 15 : 15 + 16;
z_stream strm;
strm.zalloc = zipio_alloc;
strm.zfree = zipio_free;
strm.opaque = Z_NULL;
strm.avail_in = 0;
strm.next_in = Z_NULL;
int err = inflateInit2(&strm, window_bits);
ERR_FAIL_COND_V(err != Z_OK, -1);
strm.avail_in = p_src_size;
strm.avail_out = p_dst_max_size;
strm.next_in = (Bytef *)p_src;
strm.next_out = p_dst;
err = inflate(&strm, Z_FINISH);
int total = strm.total_out;
inflateEnd(&strm);
ERR_FAIL_COND_V(err != Z_STREAM_END, -1);
return total;
} break;
case MODE_ZSTD: {
ZSTD_DCtx *dctx = ZSTD_createDCtx();
if (zstd_long_distance_matching) ZSTD_DCtx_setMaxWindowSize(dctx, (size_t)1 << zstd_window_log_size);
int ret = ZSTD_decompressDCtx(dctx, p_dst, p_dst_max_size, p_src, p_src_size);
ZSTD_freeDCtx(dctx);
return ret;
} break;
}
ERR_FAIL_V(-1);
}
int Compression::zlib_level = Z_DEFAULT_COMPRESSION;
int Compression::gzip_level = Z_DEFAULT_COMPRESSION;
int Compression::zstd_level = 3;
bool Compression::zstd_long_distance_matching = false;
int Compression::zstd_window_log_size = 27;