1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/src/utils/SkBase64.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,164 @@
1.4 +
1.5 +/*
1.6 + * Copyright 2006 The Android Open Source Project
1.7 + *
1.8 + * Use of this source code is governed by a BSD-style license that can be
1.9 + * found in the LICENSE file.
1.10 + */
1.11 +
1.12 +
1.13 +#include "SkBase64.h"
1.14 +
1.15 +#define DecodePad -2
1.16 +#define EncodePad 64
1.17 +
1.18 +static const char default_encode[] =
1.19 + "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1.20 + "abcdefghijklmnopqrstuvwxyz"
1.21 + "0123456789+/=";
1.22 +
1.23 +static const signed char decodeData[] = {
1.24 + 62, -1, -1, -1, 63,
1.25 + 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, DecodePad, -1, -1,
1.26 + -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
1.27 + 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
1.28 + -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
1.29 + 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51
1.30 +};
1.31 +
1.32 +SkBase64::SkBase64() : fLength((size_t) -1), fData(NULL) {
1.33 +}
1.34 +
1.35 +#if defined _WIN32 && _MSC_VER >= 1300 // disable 'two', etc. may be used without having been initialized
1.36 +#pragma warning ( push )
1.37 +#pragma warning ( disable : 4701 )
1.38 +#endif
1.39 +
1.40 +SkBase64::Error SkBase64::decode(const void* srcPtr, size_t size, bool writeDestination) {
1.41 + unsigned char* dst = (unsigned char*) fData;
1.42 + const unsigned char* dstStart = (const unsigned char*) fData;
1.43 + const unsigned char* src = (const unsigned char*) srcPtr;
1.44 + bool padTwo = false;
1.45 + bool padThree = false;
1.46 + const unsigned char* end = src + size;
1.47 + while (src < end) {
1.48 + unsigned char bytes[4];
1.49 + int byte = 0;
1.50 + do {
1.51 + unsigned char srcByte = *src++;
1.52 + if (srcByte == 0)
1.53 + goto goHome;
1.54 + if (srcByte <= ' ')
1.55 + continue; // treat as white space
1.56 + if (srcByte < '+' || srcByte > 'z')
1.57 + return kBadCharError;
1.58 + signed char decoded = decodeData[srcByte - '+'];
1.59 + bytes[byte] = decoded;
1.60 + if (decoded < 0) {
1.61 + if (decoded == DecodePad)
1.62 + goto handlePad;
1.63 + return kBadCharError;
1.64 + } else
1.65 + byte++;
1.66 + if (*src)
1.67 + continue;
1.68 + if (byte == 0)
1.69 + goto goHome;
1.70 + if (byte == 4)
1.71 + break;
1.72 +handlePad:
1.73 + if (byte < 2)
1.74 + return kPadError;
1.75 + padThree = true;
1.76 + if (byte == 2)
1.77 + padTwo = true;
1.78 + break;
1.79 + } while (byte < 4);
1.80 + int two = 0;
1.81 + int three = 0;
1.82 + if (writeDestination) {
1.83 + int one = (uint8_t) (bytes[0] << 2);
1.84 + two = bytes[1];
1.85 + one |= two >> 4;
1.86 + two = (uint8_t) (two << 4);
1.87 + three = bytes[2];
1.88 + two |= three >> 2;
1.89 + three = (uint8_t) (three << 6);
1.90 + three |= bytes[3];
1.91 + SkASSERT(one < 256 && two < 256 && three < 256);
1.92 + *dst = (unsigned char) one;
1.93 + }
1.94 + dst++;
1.95 + if (padTwo)
1.96 + break;
1.97 + if (writeDestination)
1.98 + *dst = (unsigned char) two;
1.99 + dst++;
1.100 + if (padThree)
1.101 + break;
1.102 + if (writeDestination)
1.103 + *dst = (unsigned char) three;
1.104 + dst++;
1.105 + }
1.106 +goHome:
1.107 + fLength = dst - dstStart;
1.108 + return kNoError;
1.109 +}
1.110 +
1.111 +#if defined _WIN32 && _MSC_VER >= 1300
1.112 +#pragma warning ( pop )
1.113 +#endif
1.114 +
1.115 +size_t SkBase64::Encode(const void* srcPtr, size_t length, void* dstPtr, const char* encodeMap) {
1.116 + const char* encode;
1.117 + if (NULL == encodeMap) {
1.118 + encode = default_encode;
1.119 + } else {
1.120 + encode = encodeMap;
1.121 + }
1.122 + const unsigned char* src = (const unsigned char*) srcPtr;
1.123 + unsigned char* dst = (unsigned char*) dstPtr;
1.124 + if (dst) {
1.125 + size_t remainder = length % 3;
1.126 + const unsigned char* end = &src[length - remainder];
1.127 + while (src < end) {
1.128 + unsigned a = *src++;
1.129 + unsigned b = *src++;
1.130 + unsigned c = *src++;
1.131 + int d = c & 0x3F;
1.132 + c = (c >> 6 | b << 2) & 0x3F;
1.133 + b = (b >> 4 | a << 4) & 0x3F;
1.134 + a = a >> 2;
1.135 + *dst++ = encode[a];
1.136 + *dst++ = encode[b];
1.137 + *dst++ = encode[c];
1.138 + *dst++ = encode[d];
1.139 + }
1.140 + if (remainder > 0) {
1.141 + int k1 = 0;
1.142 + int k2 = EncodePad;
1.143 + int a = (uint8_t) *src++;
1.144 + if (remainder == 2)
1.145 + {
1.146 + int b = *src++;
1.147 + k1 = b >> 4;
1.148 + k2 = (b << 2) & 0x3F;
1.149 + }
1.150 + *dst++ = encode[a >> 2];
1.151 + *dst++ = encode[(k1 | a << 4) & 0x3F];
1.152 + *dst++ = encode[k2];
1.153 + *dst++ = encode[EncodePad];
1.154 + }
1.155 + }
1.156 + return (length + 2) / 3 * 4;
1.157 +}
1.158 +
1.159 +SkBase64::Error SkBase64::decode(const char* src, size_t len) {
1.160 + Error err = decode(src, len, false);
1.161 + SkASSERT(err == kNoError);
1.162 + if (err != kNoError)
1.163 + return err;
1.164 + fData = new char[fLength]; // should use sk_malloc/sk_free
1.165 + decode(src, len, true);
1.166 + return kNoError;
1.167 +}
