3 * Copyright 2006 The Android Open Source Project
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
15 static const char default_encode[] =
16 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
17 "abcdefghijklmnopqrstuvwxyz"
20 static const signed char decodeData[] = {
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
29 SkBase64::SkBase64() : fLength((size_t) -1), fData(NULL) {
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 )
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;
42 bool padThree = false;
43 const unsigned char* end = src + size;
45 unsigned char bytes[4];
48 unsigned char srcByte = *src++;
52 continue; // treat as white space
53 if (srcByte < '+' || srcByte > 'z')
55 signed char decoded = decodeData[srcByte - '+'];
56 bytes[byte] = decoded;
58 if (decoded == DecodePad)
79 if (writeDestination) {
80 int one = (uint8_t) (bytes[0] << 2);
83 two = (uint8_t) (two << 4);
86 three = (uint8_t) (three << 6);
88 SkASSERT(one < 256 && two < 256 && three < 256);
89 *dst = (unsigned char) one;
95 *dst = (unsigned char) two;
100 *dst = (unsigned char) three;
104 fLength = dst - dstStart;
108 #if defined _WIN32 && _MSC_VER >= 1300
109 #pragma warning ( pop )
112 size_t SkBase64::Encode(const void* srcPtr, size_t length, void* dstPtr, const char* encodeMap) {
114 if (NULL == encodeMap) {
115 encode = default_encode;
119 const unsigned char* src = (const unsigned char*) srcPtr;
120 unsigned char* dst = (unsigned char*) dstPtr;
122 size_t remainder = length % 3;
123 const unsigned char* end = &src[length - remainder];
129 c = (c >> 6 | b << 2) & 0x3F;
130 b = (b >> 4 | a << 4) & 0x3F;
140 int a = (uint8_t) *src++;
145 k2 = (b << 2) & 0x3F;
147 *dst++ = encode[a >> 2];
148 *dst++ = encode[(k1 | a << 4) & 0x3F];
150 *dst++ = encode[EncodePad];
153 return (length + 2) / 3 * 4;
156 SkBase64::Error SkBase64::decode(const char* src, size_t len) {
157 Error err = decode(src, len, false);
158 SkASSERT(err == kNoError);
161 fData = new char[fLength]; // should use sk_malloc/sk_free
162 decode(src, len, true);