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1 /* |
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2 * Copyright (c) 2002-2004 Nokia Corporation and/or its subsidiary(-ies). |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of "Eclipse Public License v1.0" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - initial contribution. |
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11 * |
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12 * Contributors: |
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13 * |
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14 * Description: ?Description |
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15 * |
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16 */ |
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17 |
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18 |
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19 |
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20 // INCLUDE FILES |
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21 #include <e32std.h> |
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22 #include "base64.h" |
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23 |
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24 // LOCAL CONSTANTS AND MACROS |
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25 LOCAL_C const TUint8* const KBase64Chars = |
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26 _S8("ABCDEFGHIJKLMNOPQRSTUVWXYZ" |
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27 "abcdefghijklmnopqrstuvwxyz" |
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28 "0123456789+/"); |
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29 |
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30 // LOCAL FUNCTION PROTOTYPES |
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31 LOCAL_C TUint8 FindBase64Char( |
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32 TUint aChar); |
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33 |
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34 // ============================= LOCAL FUNCTIONS =============================== |
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35 |
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36 // ----------------------------------------------------------------------------- |
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37 // ?function_name ?description. |
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38 // ?description |
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39 // Returns: ?value_1: ?description |
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40 // ?value_n: ?description_line1 |
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41 // ?description_line2 |
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42 // ----------------------------------------------------------------------------- |
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43 // |
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44 LOCAL_C TUint8 FindBase64Char( |
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45 TUint aChar) |
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46 { |
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47 TUint8 i; |
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48 |
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49 for (i = 0; i < 64; i++) |
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50 { |
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51 if (aChar == KBase64Chars[i]) break; |
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52 } |
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53 return i; |
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54 } |
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55 |
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56 // ========================== OTHER EXPORTED FUNCTIONS ========================= |
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57 |
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58 // ----------------------------------------------------------------------------- |
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59 // ?function_name implements... |
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60 // ?implementation_description. |
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61 // Returns: ?value_1: ?description |
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62 // ?value_n: ?description |
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63 // ?description |
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64 // ----------------------------------------------------------------------------- |
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65 // |
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66 EXPORT_C HBufC8* Base64EncodeL( |
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67 const TDesC8& aInput) |
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68 { |
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69 HBufC8* ret; |
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70 TInt i = 0; |
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71 TInt j = 0; |
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72 TUint8 charArray3[3]; |
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73 TUint8 charArray4[4]; |
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74 TInt l = 0; |
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75 |
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76 ret = HBufC8::NewL((aInput.Length() * 4 + 1) / 3); |
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77 TPtr8 des = ret->Des(); |
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78 while (l < aInput.Length()) |
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79 { |
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80 charArray3[i++] = aInput[l]; |
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81 l++; |
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82 if (i == 3) |
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83 { |
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84 charArray4[0] = static_cast<TUint8>((charArray3[0] & 0xfc) >> 2); |
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85 charArray4[1] = static_cast<TUint8>( |
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86 ((charArray3[0] & 0x03) << 4) + ((charArray3[1] & 0xf0) >> 4)); |
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87 charArray4[2] = static_cast<TUint8>( |
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88 ((charArray3[1] & 0x0f) << 2) + ((charArray3[2] & 0xc0) >> 6)); |
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89 charArray4[3] = static_cast<TUint8>(charArray3[2] & 0x3f); |
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90 |
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91 for (i = 0; i <4; i++) |
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92 { |
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93 des.Append(KBase64Chars[charArray4[i]]); |
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94 } |
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95 i = 0; |
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96 } |
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97 } |
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98 |
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99 if (i != 0) |
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100 { |
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101 for (j = i; j < 3; j++) |
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102 { |
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103 charArray3[j] = '\0'; |
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104 } |
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105 |
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106 charArray4[0] = static_cast<TUint8>((charArray3[0] & 0xfc) >> 2); |
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107 charArray4[1] = static_cast<TUint8>( |
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108 ((charArray3[0] & 0x03) << 4) +((charArray3[1] & 0xf0) >> 4)); |
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109 charArray4[2] = static_cast<TUint8>( |
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110 ((charArray3[1] & 0x0f) << 2) +((charArray3[2] & 0xc0) >> 6)); |
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111 charArray4[3] = static_cast<TUint8>(charArray3[2] & 0x3f); |
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112 |
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113 for (j = 0; j < i + 1; j++) |
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114 { |
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115 des.Append(KBase64Chars[charArray4[j]]); |
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116 } |
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117 |
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118 while ((i++ < 3)) |
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119 { |
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120 des.Append('='); |
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121 } |
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122 } |
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123 |
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124 return ret; |
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125 } |
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126 |
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127 // ----------------------------------------------------------------------------- |
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128 // ?function_name implements... |
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129 // ?implementation_description. |
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130 // Returns: ?value_1: ?description |
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131 // ?value_n: ?description |
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132 // ?description |
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133 // ----------------------------------------------------------------------------- |
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134 // |
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135 EXPORT_C HBufC8* Base64DecodeL( |
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136 const TDesC8& aInput) |
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137 { |
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138 TInt len = aInput.Length(); |
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139 TInt i = 0; |
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140 TInt j = 0; |
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141 TInt in = 0; |
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142 TUint8 charArray4[4], charArray3[3]; |
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143 HBufC8* ret; |
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144 |
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145 ret = HBufC8::NewL((aInput.Length() * 3 + 1) / 4); |
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146 TPtr8 des = ret->Des(); |
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147 while (len-- && aInput[in] != '=') |
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148 { |
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149 if (FindBase64Char(aInput[in]) < 64) |
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150 { |
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151 charArray4[i++] = aInput[in]; in++; |
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152 } |
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153 else |
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154 { |
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155 in++; |
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156 } |
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157 |
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158 if (i == 4) |
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159 { |
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160 for (i = 0; i < 4; i++) |
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161 { |
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162 charArray4[i] = FindBase64Char(charArray4[i]); |
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163 } |
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164 |
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165 charArray3[0] = static_cast<TUint8>( |
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166 (charArray4[0] << 2) + ((charArray4[1] & 0x30) >> 4)); |
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167 charArray3[1] = static_cast<TUint8>( |
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168 ((charArray4[1] & 0xf) << 4) + ((charArray4[2] & 0x3c) >> 2)); |
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169 charArray3[2] = static_cast<TUint8>( |
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170 ((charArray4[2] & 0x3) << 6) + charArray4[3]); |
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171 |
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172 for (i = 0; i < 3; i++) |
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173 { |
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174 des.Append(charArray3[i]); |
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175 } |
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176 i = 0; |
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177 } |
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178 } |
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179 |
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180 if (i != 0) |
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181 { |
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182 for (j = i; j < 4; j++) |
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183 { |
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184 charArray4[j] = 0; |
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185 } |
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186 |
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187 for (j = 0; j < 4; j++) |
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188 { |
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189 charArray4[j] = FindBase64Char(charArray4[j]); |
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190 } |
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191 |
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192 charArray3[0] = static_cast<TUint8>( |
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193 (charArray4[0] << 2) + ((charArray4[1] & 0x30) >> 4)); |
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194 charArray3[1] = static_cast<TUint8>( |
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195 ((charArray4[1] & 0xf) << 4) + ((charArray4[2] & 0x3c) >> 2)); |
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196 charArray3[2] = static_cast<TUint8>( |
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197 ((charArray4[2] & 0x3) << 6) + charArray4[3]); |
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198 |
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199 for (j = 0; j < i - 1; j++) |
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200 { |
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201 des.Append(charArray3[j]); |
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202 } |
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203 } |
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204 |
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205 return ret; |
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206 } |
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207 |
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208 // End of File |