1 /* 2 * Copyright 2017, Jérôme Duval. 3 * Copyright 2014, Ingo Weinhold, ingo_weinhold@gmx.de. 4 * Distributed under the terms of the MIT License. 5 */ 6 #ifndef _ZSTD_COMPRESSION_ALGORITHM_H_ 7 #define _ZSTD_COMPRESSION_ALGORITHM_H_ 8 9 10 #include <CompressionAlgorithm.h> 11 12 13 // compression level 14 enum { 15 B_ZSTD_COMPRESSION_NONE = 0, 16 B_ZSTD_COMPRESSION_FASTEST = 1, 17 B_ZSTD_COMPRESSION_BEST = 22, 18 B_ZSTD_COMPRESSION_DEFAULT = 4, 19 }; 20 21 22 class BZstdCompressionParameters : public BCompressionParameters { 23 public: 24 BZstdCompressionParameters( 25 int compressionLevel 26 = B_ZSTD_COMPRESSION_DEFAULT); 27 virtual ~BZstdCompressionParameters(); 28 29 int32 CompressionLevel() const; 30 void SetCompressionLevel(int32 level); 31 32 size_t BufferSize() const; 33 void SetBufferSize(size_t size); 34 35 private: 36 int32 fCompressionLevel; 37 size_t fBufferSize; 38 }; 39 40 41 class BZstdDecompressionParameters : public BDecompressionParameters { 42 public: 43 BZstdDecompressionParameters(); 44 virtual ~BZstdDecompressionParameters(); 45 46 size_t BufferSize() const; 47 void SetBufferSize(size_t size); 48 49 private: 50 size_t fBufferSize; 51 }; 52 53 54 class BZstdCompressionAlgorithm : public BCompressionAlgorithm { 55 public: 56 BZstdCompressionAlgorithm(); 57 virtual ~BZstdCompressionAlgorithm(); 58 59 virtual status_t CreateCompressingInputStream(BDataIO* input, 60 const BCompressionParameters* parameters, 61 BDataIO*& _stream); 62 virtual status_t CreateCompressingOutputStream(BDataIO* output, 63 const BCompressionParameters* parameters, 64 BDataIO*& _stream); 65 virtual status_t CreateDecompressingInputStream(BDataIO* input, 66 const BDecompressionParameters* parameters, 67 BDataIO*& _stream); 68 virtual status_t CreateDecompressingOutputStream(BDataIO* output, 69 const BDecompressionParameters* parameters, 70 BDataIO*& _stream); 71 72 virtual status_t CompressBuffer(const void* input, 73 size_t inputSize, void* output, 74 size_t outputSize, size_t& _compressedSize, 75 const BCompressionParameters* parameters 76 = NULL); 77 virtual status_t DecompressBuffer(const void* input, 78 size_t inputSize, void* output, 79 size_t outputSize, 80 size_t& _uncompressedSize, 81 const BDecompressionParameters* parameters 82 = NULL); 83 84 private: 85 struct CompressionStrategy; 86 struct DecompressionStrategy; 87 88 template<typename BaseClass, typename Strategy, typename StreamType> struct Stream; 89 template<typename BaseClass, typename Strategy, typename StreamType> 90 friend struct Stream; 91 92 private: 93 static status_t _TranslateZstdError(size_t error); 94 }; 95 96 97 #endif // _ZSTD_COMPRESSION_ALGORITHM_H_ 98