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annotate deps/Platinum/ThirdParty/Neptune/Source/Core/NptBase64.cpp @ 0:3425707ddbf6

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Initial import (hopefully this mercurial stuff works...)
author fraserofthenight
date Mon, 06 Jul 2009 08:06:28 -0700
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1 /*****************************************************************
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2 |
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3 | Neptune - Base64
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4 |
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5 | Copyright (c) 2002-2008, Axiomatic Systems, LLC.
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6 | All rights reserved.
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7 |
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8 | Redistribution and use in source and binary forms, with or without
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9 | modification, are permitted provided that the following conditions are met:
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10 | * Redistributions of source code must retain the above copyright
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11 | notice, this list of conditions and the following disclaimer.
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12 | * Redistributions in binary form must reproduce the above copyright
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13 | notice, this list of conditions and the following disclaimer in the
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14 | documentation and/or other materials provided with the distribution.
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15 | * Neither the name of Axiomatic Systems nor the
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16 | names of its contributors may be used to endorse or promote products
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17 | derived from this software without specific prior written permission.
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18 |
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19 | THIS SOFTWARE IS PROVIDED BY AXIOMATIC SYSTEMS ''AS IS'' AND ANY
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20 | EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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21 | WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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22 | DISCLAIMED. IN NO EVENT SHALL AXIOMATIC SYSTEMS BE LIABLE FOR ANY
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23 | DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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24 | (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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25 | LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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26 | ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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27 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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28 | SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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29 |
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30 ****************************************************************/
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31
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32 /*----------------------------------------------------------------------
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33 | includes
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34 +---------------------------------------------------------------------*/
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35 #include "NptBase64.h"
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36 #include "NptUtils.h"
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37 #include "NptResults.h"
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38
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39 /*----------------------------------------------------------------------
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40 | constants
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41 +---------------------------------------------------------------------*/
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42 static const signed char NPT_Base64_Bytes[128] = {
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43 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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44 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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45 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0x3E, -1, -1, -1, 0x3F,
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46 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, -1, -1, -1, 0x7F, -1, -1,
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47 -1, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E,
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48 0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, -1, -1, -1, -1, -1,
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49 -1, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,
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50 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F, 0x30, 0x31, 0x32, 0x33, -1, -1, -1, -1, -1
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51 };
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52
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53 static const char NPT_Base64_Chars[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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54 const char NPT_BASE64_PAD_CHAR = '=';
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55 const char NPT_BASE64_PAD_BYTE = 0x7F;
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56
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57 /*----------------------------------------------------------------------
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58 | NPT_Base64::Decode
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59 +---------------------------------------------------------------------*/
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60 NPT_Result
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61 NPT_Base64::Decode(const char* base64,
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62 NPT_Size size,
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63 NPT_DataBuffer& data,
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64 bool url_safe /* = false */)
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65 {
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66 // estimate the data size
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67 data.SetBufferSize(size);
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68
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69 // reset the buffer
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70 data.SetDataSize(0);
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71
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72 // keep a pointer to the buffer
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73 unsigned char* buffer = data.UseData();
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74 NPT_Size data_size = 0;
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75
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76 // iterate over all characters
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77 unsigned char codes[4];
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78 unsigned int code_count = 0;
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79 while (size--) {
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80 unsigned char c = *base64++;
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81 if (c >= NPT_ARRAY_SIZE(NPT_Base64_Bytes)) continue;
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82 if (url_safe) {
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83 // remap some characters
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84 if (c == '-') {
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85 c = '+';
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86 } else if (c == '_') {
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87 c = '/';
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88 }
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89 }
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90 signed char code = NPT_Base64_Bytes[c];
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91 if (code >= 0) {
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92 // valid code
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93 codes[code_count++] = code;
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94 if (code_count == 4) {
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95 // group complete
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96 if (codes[0] == NPT_BASE64_PAD_BYTE || codes[1] == NPT_BASE64_PAD_BYTE) {
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97 return NPT_ERROR_INVALID_FORMAT;
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98 }
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99 if (codes[2] == NPT_BASE64_PAD_BYTE) {
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100 // pad at char 3
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101 if (codes[3] == NPT_BASE64_PAD_BYTE) {
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102 // double padding
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103 unsigned int packed = (codes[0]<<2)|(codes[1]>>4);
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104 buffer[data_size++] = (unsigned char)packed;
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105 } else {
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106 // invalid padding
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107 return NPT_ERROR_INVALID_FORMAT;
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108 }
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109 } else if (codes[3] == NPT_BASE64_PAD_BYTE) {
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110 // single padding
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111 unsigned int packed = (codes[0]<<10)|(codes[1]<<4)|(codes[2]>>2);
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112 buffer[data_size++] = (unsigned char)(packed >> 8);
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113 buffer[data_size++] = (unsigned char)(packed );
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114 } else {
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115 // no padding
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116 unsigned int packed = (codes[0]<<18)|(codes[1]<<12)|(codes[2]<<6)|codes[3];
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117 buffer[data_size++] = (unsigned char)(packed >> 16);
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118 buffer[data_size++] = (unsigned char)(packed >> 8);
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119 buffer[data_size++] = (unsigned char)(packed );
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120 }
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121 code_count = 0;
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122 }
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123 }
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124 }
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125
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126 if (code_count) return NPT_ERROR_INVALID_FORMAT;
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127
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128 // update the data size
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129 data.SetDataSize(data_size);
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130
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131 return NPT_SUCCESS;
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132 }
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133
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134 /*----------------------------------------------------------------------
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135 | NPT_Base64::Encode
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136 +---------------------------------------------------------------------*/
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137 NPT_Result
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138 NPT_Base64::Encode(const NPT_Byte* data,
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139 NPT_Size size,
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140 NPT_String& base64,
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141 NPT_Cardinal max_blocks_per_line /* = 0 */,
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142 bool url_safe /* = false */)
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143 {
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144 unsigned int block_count = 0;
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145 unsigned int i = 0;
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146
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147 // reserve space for the string
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148 base64.Reserve(4*((size+3)/3) + 2*(max_blocks_per_line?(size/(3*max_blocks_per_line)):0));
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149 char* buffer = base64.UseChars();
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150
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151 // encode each byte
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152 while (size >= 3) {
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153 // output a block
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154 *buffer++ = NPT_Base64_Chars[ (data[i ] >> 2) & 0x3F];
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155 *buffer++ = NPT_Base64_Chars[((data[i ] & 0x03) << 4) | ((data[i+1] >> 4) & 0x0F)];
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156 *buffer++ = NPT_Base64_Chars[((data[i+1] & 0x0F) << 2) | ((data[i+2] >> 6) & 0x03)];
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157 *buffer++ = NPT_Base64_Chars[ data[i+2] & 0x3F];
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158
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159 size -= 3;
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160 i += 3;
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161 if (++block_count == max_blocks_per_line) {
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162 *buffer++ = '\r';
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163 *buffer++ = '\n';
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164 block_count = 0;
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165 }
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166 }
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167
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168 // deal with the tail
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169 if (size == 2) {
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170 *buffer++ = NPT_Base64_Chars[ (data[i ] >> 2) & 0x3F];
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171 *buffer++ = NPT_Base64_Chars[((data[i ] & 0x03) << 4) | ((data[i+1] >> 4) & 0x0F)];
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172 *buffer++ = NPT_Base64_Chars[ (data[i+1] & 0x0F) << 2];
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173 *buffer++ = NPT_BASE64_PAD_CHAR;
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174 } else if (size == 1) {
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175 *buffer++ = NPT_Base64_Chars[(data[i] >> 2) & 0x3F];
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176 *buffer++ = NPT_Base64_Chars[(data[i] & 0x03) << 4];
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177 *buffer++ = NPT_BASE64_PAD_CHAR;
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178 *buffer++ = NPT_BASE64_PAD_CHAR;
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179 }
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180
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181 // update the string size
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182 NPT_ASSERT((NPT_Size)(buffer-base64.GetChars()) <= base64.GetCapacity());
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183 base64.SetLength((NPT_Size)(buffer-base64.GetChars()));
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184
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185 // deal with url safe remapping
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186 if (url_safe) {
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187 base64.Replace('+','-');
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188 base64.Replace('/','_');
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189 }
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190
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191 return NPT_SUCCESS;
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192 }