1 /* 2 * Copyright 2012 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef SkMD5_DEFINED 9 #define SkMD5_DEFINED 10 11 #include "SkStream.h" 12 13 /* Calculate a 128-bit MD5 message-digest of the bytes sent to this stream. */ 14 class SkMD5 : public SkWStream { 15 public: 16 SkMD5(); 17 18 /** Processes input, adding it to the digest. 19 Calling this after finish is undefined. */ 20 bool write(const void* buffer, size_t size) final; 21 22 size_t bytesWritten() const final { return SkToSizeT(this->byteCount); } 23 24 struct Digest { 25 uint8_t data[16]; 26 bool operator ==(Digest const& other) const { 27 return 0 == memcmp(data, other.data, sizeof(data)); 28 } 29 bool operator !=(Digest const& other) const { return !(*this == other); } 30 }; 31 32 /** Computes and returns the digest. */ 33 void finish(Digest& digest); 34 35 private: 36 uint64_t byteCount; // number of bytes, modulo 2^64 37 uint32_t state[4]; // state (ABCD) 38 uint8_t buffer[64]; // input buffer 39 }; 40 41 #endif 42
