43 lines
1.4 KiB
C++
43 lines
1.4 KiB
C++
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#pragma once
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#include <cstddef>
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#include <string>
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namespace tinyusdz {
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// Based on USD' TfFastCompression
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class LZ4Compression
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{
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public:
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/// Return the largest input buffer size that can be compressed with these
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/// functions. Guaranteed to be at least 200 GB.
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static size_t
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GetMaxInputSize();
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/// Return the largest possible compressed size for the given \p inputSize
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/// in the worst case (input is not compressible). This is larger than
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/// \p inputSize. If inputSize is larger than GetMaxInputSize(), return 0.
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static size_t
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GetCompressedBufferSize(size_t inputSize);
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/// Compress \p inputSize bytes in \p input and store the result in
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/// \p compressed. The \p compressed buffer must point to at least
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/// GetCompressedBufferSize(uncompressedSize) bytes. Return the number of
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/// bytes written to the \p compressed buffer. Issue a runtime error and
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/// return ~0 in case of an error.
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static size_t
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CompressToBuffer(char const *input, char *compressed, size_t inputSize, std::string *err);
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/// Decompress \p compressedSize bytes in \p compressed and store the
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/// result in \p output. No more than \p maxOutputSize bytes will be
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/// written to \p output.
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static size_t
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DecompressFromBuffer(char const *compressed, char *output,
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size_t compressedSize, size_t maxOutputSize, std::string *err);
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};
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} // namespace tinyusdz
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