Line data    Source code

       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           0 : 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           0 :     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