/*************************************************************************/ /* compression.cpp */ /*************************************************************************/ /* This file is part of: */ /* GODOT ENGINE */ /* https://godotengine.org */ /*************************************************************************/ /* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur. */ /* Copyright (c) 2014-2018 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 "os/copymem.h" #include "zip_io.h" #include "thirdparty/misc/fastlz.h" #include <zlib.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: { z_stream strm; strm.zalloc = zipio_alloc; strm.zfree = zipio_free; strm.opaque = Z_NULL; int err = deflateInit(&strm, Z_DEFAULT_COMPRESSION); 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; } 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: { z_stream strm; strm.zalloc = zipio_alloc; strm.zfree = zipio_free; strm.opaque = Z_NULL; int err = deflateInit(&strm, Z_DEFAULT_COMPRESSION); if (err != Z_OK) return -1; int aout = deflateBound(&strm, p_src_size); deflateEnd(&strm); return aout; } 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: { 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 = inflateInit(&strm); 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; } ERR_FAIL_V(-1); }