144 lines
4.5 KiB
C++
144 lines
4.5 KiB
C++
/*************************************************************************/
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/* compression.cpp */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* http://www.godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#include "compression.h"
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#include "os/copymem.h"
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#include "zlib.h"
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#include "fastlz.h"
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#include "zip_io.h"
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int Compression::compress(uint8_t *p_dst, const uint8_t *p_src, int p_src_size, Mode p_mode) {
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switch (p_mode) {
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case MODE_FASTLZ: {
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if (p_src_size < 16) {
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uint8_t src[16];
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zeromem(&src[p_src_size], 16 - p_src_size);
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copymem(src, p_src, p_src_size);
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return fastlz_compress(src, 16, p_dst);
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} else {
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return fastlz_compress(p_src, p_src_size, p_dst);
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}
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} break;
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case MODE_DEFLATE: {
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z_stream strm;
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strm.zalloc = zipio_alloc;
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strm.zfree = zipio_free;
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strm.opaque = Z_NULL;
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int err = deflateInit(&strm, Z_DEFAULT_COMPRESSION);
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if (err != Z_OK)
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return -1;
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strm.avail_in = p_src_size;
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int aout = deflateBound(&strm, p_src_size);
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strm.avail_out = aout;
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strm.next_in = (Bytef *)p_src;
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strm.next_out = p_dst;
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deflate(&strm, Z_FINISH);
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aout = aout - strm.avail_out;
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deflateEnd(&strm);
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return aout;
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} break;
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}
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ERR_FAIL_V(-1);
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}
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int Compression::get_max_compressed_buffer_size(int p_src_size, Mode p_mode) {
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switch (p_mode) {
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case MODE_FASTLZ: {
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int ss = p_src_size + p_src_size * 6 / 100;
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if (ss < 66)
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ss = 66;
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return ss;
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} break;
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case MODE_DEFLATE: {
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z_stream strm;
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strm.zalloc = zipio_alloc;
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strm.zfree = zipio_free;
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strm.opaque = Z_NULL;
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int err = deflateInit(&strm, Z_DEFAULT_COMPRESSION);
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if (err != Z_OK)
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return -1;
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int aout = deflateBound(&strm, p_src_size);
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deflateEnd(&strm);
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return aout;
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} break;
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}
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ERR_FAIL_V(-1);
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}
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void Compression::decompress(uint8_t *p_dst, int p_dst_max_size, const uint8_t *p_src, int p_src_size, Mode p_mode) {
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switch (p_mode) {
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case MODE_FASTLZ: {
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if (p_dst_max_size < 16) {
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uint8_t dst[16];
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fastlz_decompress(p_src, p_src_size, dst, 16);
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copymem(p_dst, dst, p_dst_max_size);
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} else {
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fastlz_decompress(p_src, p_src_size, p_dst, p_dst_max_size);
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}
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return;
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} break;
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case MODE_DEFLATE: {
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z_stream strm;
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strm.zalloc = zipio_alloc;
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strm.zfree = zipio_free;
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strm.opaque = Z_NULL;
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strm.avail_in = 0;
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strm.next_in = Z_NULL;
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int err = inflateInit(&strm);
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ERR_FAIL_COND(err != Z_OK);
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strm.avail_in = p_src_size;
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strm.avail_out = p_dst_max_size;
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strm.next_in = (Bytef *)p_src;
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strm.next_out = p_dst;
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err = inflate(&strm, Z_FINISH);
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inflateEnd(&strm);
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ERR_FAIL_COND(err != Z_STREAM_END);
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return;
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} break;
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}
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ERR_FAIL();
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}
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