The Tor Browser / file comparison
comparison: gfx/skia/trunk/src/utils/SkBase64.cpp
gfx/skia/trunk/src/utils/SkBase64.cpp
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:99d7a2fba594 |
|---|---|
| 1 | |
| 2 /* | |
| 3 * Copyright 2006 The Android Open Source Project | |
| 4 * | |
| 5 * Use of this source code is governed by a BSD-style license that can be | |
| 6 * found in the LICENSE file. | |
| 7 */ | |
| 8 | |
| 9 | |
| 10 #include "SkBase64.h" | |
| 11 | |
| 12 #define DecodePad -2 | |
| 13 #define EncodePad 64 | |
| 14 | |
| 15 static const char default_encode[] = | |
| 16 "ABCDEFGHIJKLMNOPQRSTUVWXYZ" | |
| 17 "abcdefghijklmnopqrstuvwxyz" | |
| 18 "0123456789+/="; | |
| 19 | |
| 20 static const signed char decodeData[] = { | |
| 21 62, -1, -1, -1, 63, | |
| 22 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, DecodePad, -1, -1, | |
| 23 -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, | |
| 24 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, | |
| 25 -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, | |
| 26 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51 | |
| 27 }; | |
| 28 | |
| 29 SkBase64::SkBase64() : fLength((size_t) -1), fData(NULL) { | |
| 30 } | |
| 31 | |
| 32 #if defined _WIN32 && _MSC_VER >= 1300 // disable 'two', etc. may be used without having been initialized | |
| 33 #pragma warning ( push ) | |
| 34 #pragma warning ( disable : 4701 ) | |
| 35 #endif | |
| 36 | |
| 37 SkBase64::Error SkBase64::decode(const void* srcPtr, size_t size, bool writeDestination) { | |
| 38 unsigned char* dst = (unsigned char*) fData; | |
| 39 const unsigned char* dstStart = (const unsigned char*) fData; | |
| 40 const unsigned char* src = (const unsigned char*) srcPtr; | |
| 41 bool padTwo = false; | |
| 42 bool padThree = false; | |
| 43 const unsigned char* end = src + size; | |
| 44 while (src < end) { | |
| 45 unsigned char bytes[4]; | |
| 46 int byte = 0; | |
| 47 do { | |
| 48 unsigned char srcByte = *src++; | |
| 49 if (srcByte == 0) | |
| 50 goto goHome; | |
| 51 if (srcByte <= ' ') | |
| 52 continue; // treat as white space | |
| 53 if (srcByte < '+' || srcByte > 'z') | |
| 54 return kBadCharError; | |
| 55 signed char decoded = decodeData[srcByte - '+']; | |
| 56 bytes[byte] = decoded; | |
| 57 if (decoded < 0) { | |
| 58 if (decoded == DecodePad) | |
| 59 goto handlePad; | |
| 60 return kBadCharError; | |
| 61 } else | |
| 62 byte++; | |
| 63 if (*src) | |
| 64 continue; | |
| 65 if (byte == 0) | |
| 66 goto goHome; | |
| 67 if (byte == 4) | |
| 68 break; | |
| 69 handlePad: | |
| 70 if (byte < 2) | |
| 71 return kPadError; | |
| 72 padThree = true; | |
| 73 if (byte == 2) | |
| 74 padTwo = true; | |
| 75 break; | |
| 76 } while (byte < 4); | |
| 77 int two = 0; | |
| 78 int three = 0; | |
| 79 if (writeDestination) { | |
| 80 int one = (uint8_t) (bytes[0] << 2); | |
| 81 two = bytes[1]; | |
| 82 one |= two >> 4; | |
| 83 two = (uint8_t) (two << 4); | |
| 84 three = bytes[2]; | |
| 85 two |= three >> 2; | |
| 86 three = (uint8_t) (three << 6); | |
| 87 three |= bytes[3]; | |
| 88 SkASSERT(one < 256 && two < 256 && three < 256); | |
| 89 *dst = (unsigned char) one; | |
| 90 } | |
| 91 dst++; | |
| 92 if (padTwo) | |
| 93 break; | |
| 94 if (writeDestination) | |
| 95 *dst = (unsigned char) two; | |
| 96 dst++; | |
| 97 if (padThree) | |
| 98 break; | |
| 99 if (writeDestination) | |
| 100 *dst = (unsigned char) three; | |
| 101 dst++; | |
| 102 } | |
| 103 goHome: | |
| 104 fLength = dst - dstStart; | |
| 105 return kNoError; | |
| 106 } | |
| 107 | |
| 108 #if defined _WIN32 && _MSC_VER >= 1300 | |
| 109 #pragma warning ( pop ) | |
| 110 #endif | |
| 111 | |
| 112 size_t SkBase64::Encode(const void* srcPtr, size_t length, void* dstPtr, const char* encodeMap) { | |
| 113 const char* encode; | |
| 114 if (NULL == encodeMap) { | |
| 115 encode = default_encode; | |
| 116 } else { | |
| 117 encode = encodeMap; | |
| 118 } | |
| 119 const unsigned char* src = (const unsigned char*) srcPtr; | |
| 120 unsigned char* dst = (unsigned char*) dstPtr; | |
| 121 if (dst) { | |
| 122 size_t remainder = length % 3; | |
| 123 const unsigned char* end = &src[length - remainder]; | |
| 124 while (src < end) { | |
| 125 unsigned a = *src++; | |
| 126 unsigned b = *src++; | |
| 127 unsigned c = *src++; | |
| 128 int d = c & 0x3F; | |
| 129 c = (c >> 6 | b << 2) & 0x3F; | |
| 130 b = (b >> 4 | a << 4) & 0x3F; | |
| 131 a = a >> 2; | |
| 132 *dst++ = encode[a]; | |
| 133 *dst++ = encode[b]; | |
| 134 *dst++ = encode[c]; | |
| 135 *dst++ = encode[d]; | |
| 136 } | |
| 137 if (remainder > 0) { | |
| 138 int k1 = 0; | |
| 139 int k2 = EncodePad; | |
| 140 int a = (uint8_t) *src++; | |
| 141 if (remainder == 2) | |
| 142 { | |
| 143 int b = *src++; | |
| 144 k1 = b >> 4; | |
| 145 k2 = (b << 2) & 0x3F; | |
| 146 } | |
| 147 *dst++ = encode[a >> 2]; | |
| 148 *dst++ = encode[(k1 | a << 4) & 0x3F]; | |
| 149 *dst++ = encode[k2]; | |
| 150 *dst++ = encode[EncodePad]; | |
| 151 } | |
| 152 } | |
| 153 return (length + 2) / 3 * 4; | |
| 154 } | |
| 155 | |
| 156 SkBase64::Error SkBase64::decode(const char* src, size_t len) { | |
| 157 Error err = decode(src, len, false); | |
| 158 SkASSERT(err == kNoError); | |
| 159 if (err != kNoError) | |
| 160 return err; | |
| 161 fData = new char[fLength]; // should use sk_malloc/sk_free | |
| 162 decode(src, len, true); | |
| 163 return kNoError; | |
| 164 } |
