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 "include/core/SkStream.h"
12#include "include/private/SkTo.h"
13
14/* Calculate a 128-bit MD5 message-digest of the bytes sent to this stream. */
15class SkMD5 : public SkWStream {
16public:
17 SkMD5();
18
19 /** Processes input, adding it to the digest.
20 Calling this after finish is undefined. */
21 bool write(const void* buffer, size_t size) final;
22
23 size_t bytesWritten() const final { return SkToSizeT(this->byteCount); }
24
25 struct Digest {
26 uint8_t data[16];
27 bool operator ==(Digest const& other) const {
28 return 0 == memcmp(data, other.data, sizeof(data));
29 }
30 bool operator !=(Digest const& other) const { return !(*this == other); }
31 };
32
33 /** Computes and returns the digest. */
34 Digest finish();
35
36private:
37 uint64_t byteCount; // number of bytes, modulo 2^64
38 uint32_t state[4]; // state (ABCD)
39 uint8_t buffer[64]; // input buffer
40};
41
42#endif
43