OLD | NEW |
1 /* | 1 // Copyright 2016 Google Inc. |
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 "SkTypes.h" | |
12 #include "SkEndian.h" | |
13 #include "SkStream.h" | |
14 | |
15 //The following macros can be defined to affect the MD5 code generated. | |
16 //SK_MD5_CLEAR_DATA causes all intermediate state to be overwritten with 0's. | |
17 //SK_CPU_LENDIAN allows 32 bit <=> 8 bit conversions without copies (if alligned
). | |
18 //SK_CPU_FAST_UNALIGNED_ACCESS allows 32 bit <=> 8 bit conversions without copie
s if SK_CPU_LENDIAN. | |
19 | |
20 class SkMD5 : public SkWStream { | |
21 public: | |
22 SkMD5(); | |
23 | |
24 /** Processes input, adding it to the digest. | |
25 * Note that this treats the buffer as a series of uint8_t values. | |
26 */ | |
27 bool write(const void* buffer, size_t size) override { | |
28 this->update(reinterpret_cast<const uint8_t*>(buffer), size); | |
29 return true; | |
30 } | |
31 | |
32 size_t bytesWritten() const override { return SkToSizeT(this->byteCount); } | |
33 | |
34 /** Processes input, adding it to the digest. Calling this after finish is u
ndefined. */ | |
35 void update(const uint8_t* input, size_t length); | |
36 | |
37 struct Digest { | |
38 uint8_t data[16]; | |
39 bool operator ==(Digest const& other) const { | |
40 return 0 == memcmp(data, other.data, sizeof(data)); | |
41 } | |
42 bool operator !=(Digest const& other) const { | |
43 return 0 != memcmp(data, other.data, sizeof(data)); | |
44 } | |
45 }; | |
46 | |
47 /** Computes and returns the digest. */ | |
48 void finish(Digest& digest); | |
49 | |
50 private: | |
51 // number of bytes, modulo 2^64 | |
52 uint64_t byteCount; | |
53 | |
54 // state (ABCD) | |
55 uint32_t state[4]; | |
56 | |
57 // input buffer | |
58 uint8_t buffer[64]; | |
59 }; | |
60 | |
61 #endif | |
OLD | NEW |