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77 lines
3.4 KiB
77 lines
3.4 KiB
/****************************************************************************
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Copyright (c) 2022-2023 Xiamen Yaji Software Co., Ltd.
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http://www.cocos.com
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights to
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use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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of the Software, and to permit persons to whom the Software is furnished to do so,
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subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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****************************************************************************/
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#include <cstring>
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#include "base/Compressed.h"
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#include "base/Utils.h"
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// compressed file header
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static const uint32_t COMPRESSED_HEADER_LENGTH = 4;
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static const uint32_t COMPRESSED_MIPMAP_LEVEL_COUNT_LENGTH = 4;
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static const uint32_t COMPRESSED_MIPMAP_DATA_SIZE_LENGTH = 4;
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static const uint32_t COMPRESSED_MAGIC = 0x50494d43;
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bool compressedIsValid(const unsigned char* pFile) {
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const uint32_t magic = static_cast<uint32_t>(pFile[0]) +
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static_cast<uint32_t>(pFile[1]) * 256 +
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static_cast<uint32_t>(pFile[2]) * 65536 +
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static_cast<uint32_t>(pFile[3]) * 16777216;
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return magic == COMPRESSED_MAGIC;
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}
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uint32_t getChunkNumbers(const unsigned char* pFile) {
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return static_cast<uint32_t>(pFile[COMPRESSED_MIPMAP_LEVEL_COUNT_LENGTH + 0]) +
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static_cast<uint32_t>(pFile[COMPRESSED_MIPMAP_LEVEL_COUNT_LENGTH + 1]) * 256 +
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static_cast<uint32_t>(pFile[COMPRESSED_MIPMAP_LEVEL_COUNT_LENGTH + 2]) * 65536 +
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static_cast<uint32_t>(pFile[COMPRESSED_MIPMAP_LEVEL_COUNT_LENGTH + 3]) * 16777216;
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}
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uint32_t getChunkSizes(const unsigned char* pFile, uint32_t level) {
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const uint32_t byteOffset = COMPRESSED_HEADER_LENGTH + COMPRESSED_MIPMAP_LEVEL_COUNT_LENGTH + COMPRESSED_MIPMAP_DATA_SIZE_LENGTH * level;
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return (pFile[byteOffset + 0]) +
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(pFile[byteOffset + 1]) * 256 +
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(pFile[byteOffset + 2]) * 65536 +
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(pFile[byteOffset + 3]) * 16777216;
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}
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unsigned char* getChunk(const unsigned char* pFile, uint32_t level) {
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unsigned char* dstData = nullptr;
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const auto chunkCount = getChunkNumbers(pFile);
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const auto compressedFileHeaderLength = COMPRESSED_HEADER_LENGTH + COMPRESSED_MIPMAP_LEVEL_COUNT_LENGTH + COMPRESSED_MIPMAP_DATA_SIZE_LENGTH * chunkCount;
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uint32_t byteOffset = compressedFileHeaderLength;
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for (uint32_t i = 0; i < chunkCount; ++i) {
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const auto chunkSize = getChunkSizes(pFile, i);
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if (i == level) {
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dstData = static_cast<unsigned char*>(malloc(chunkSize * sizeof(unsigned char)));
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memcpy(dstData, pFile + byteOffset, chunkSize);
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break;
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}
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byteOffset += chunkSize;
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}
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return dstData;
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}
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