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1 // Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies). |
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2 // All rights reserved. |
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3 // This component and the accompanying materials are made available |
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4 // under the terms of the License "Symbian Foundation License v1.0" |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.symbianfoundation.org/legal/sfl-v10.html". |
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7 // |
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8 // Initial Contributors: |
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9 // Nokia Corporation - initial contribution. |
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10 // |
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11 // Contributors: |
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12 // |
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13 // Description: |
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14 // |
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15 |
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16 #include <e32std.h> |
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17 #include <e32std_private.h> |
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18 #include <e32def.h> |
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19 #include <e32def_private.h> |
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20 #include <e32des8.h> |
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21 #include <e32des8_private.h> |
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22 #include "unicodeconv.h" |
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23 |
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24 //This function converts from Unicoded characters, to foreign characters and adds them into a descriptor |
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25 TInt UnicodeConv::ConvertFromUnicodeL(TDes8& aForeign, const TDesC16& aUnicode, const TDesC8& aReplacementChar, TFatUtilityFunctions::TOverflowAction aOA) |
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26 { |
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27 const TInt unicodeLength = aUnicode.Length(); |
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28 aForeign.Zero(); |
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29 |
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30 //loop going through the character of the unicode descriptor |
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31 for(TInt i=0; i<unicodeLength; i++) |
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32 { |
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33 const TUint16 unicodeChar = aUnicode[i]; |
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34 |
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35 // if the output buffer is already full, leave with KErrOverflow |
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36 if ( aForeign.Length() == aForeign.MaxLength() ) |
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37 { |
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38 if (aOA == TFatUtilityFunctions::EOverflowActionLeave) |
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39 { |
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40 User::Leave(KErrBadName); |
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41 } |
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42 else |
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43 { |
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44 break; |
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45 } |
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46 } |
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47 |
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48 //charcters from 0x0000 to 0x007F, can be mapped directly |
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49 if(unicodeChar<0x0080) |
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50 { |
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51 aForeign.Append(static_cast<TUint8>(unicodeChar)); |
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52 } |
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53 else |
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54 { |
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55 TInt trailByte = KErrNotFound; |
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56 TInt returnValue = TConvDataStruct::ConvertSingleUnicode(unicodeChar,trailByte); |
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57 |
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58 if(returnValue!=KErrNotFound) |
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59 { |
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60 if(trailByte!=KErrNotFound) |
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61 { |
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62 aForeign.Append(static_cast<TUint8>(returnValue)); |
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63 |
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64 // as two bytes are being added check enough space for second |
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65 if ( aForeign.Length() == aForeign.MaxLength() ) |
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66 { |
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67 if (aOA == TFatUtilityFunctions::EOverflowActionLeave) |
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68 { |
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69 User::Leave(KErrBadName); |
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70 } |
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71 else |
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72 { |
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73 break; |
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74 } |
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75 } |
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76 aForeign.Append(static_cast<TUint8>(trailByte)); |
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77 } |
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78 else |
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79 { |
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80 aForeign.Append(static_cast<TUint8>(returnValue)); |
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81 } |
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82 } |
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83 else |
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84 { |
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85 aForeign.Append(aReplacementChar); |
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86 } |
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87 } |
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88 } |
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89 |
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90 return KErrNone; |
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91 } |
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92 |
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93 |
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94 //This function converts from foreign characters into unicode and adds them into a descriptor |
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95 TInt UnicodeConv::ConvertToUnicodeL(TDes16& aUnicode, const TDesC8& aForeign, TFatUtilityFunctions::TOverflowAction aOA) |
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96 { |
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97 const TInt foreignLength = aForeign.Length(); |
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98 aUnicode.Zero(); |
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99 |
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100 //loop going through the characters of the foreign descriptor |
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101 for(TInt i = 0; i<foreignLength; i++) |
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102 { |
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103 const TUint8 leadForeign = aForeign[i]; |
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104 TUint8 tailForeign = 0x00; |
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105 |
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106 // Check there is enough space in the output buffer, and leave with KErrOverflow if not |
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107 if ( aUnicode.Length() == aUnicode.MaxLength() ) |
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108 { |
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109 if (aOA == TFatUtilityFunctions::EOverflowActionLeave) |
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110 { |
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111 User::Leave(KErrBadName); |
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112 } |
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113 else |
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114 { |
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115 break; |
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116 } |
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117 } |
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118 //charcters from 0x00 to 0x7F, can be mapped directly |
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119 if(leadForeign < 0x80) |
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120 aUnicode.Append(static_cast<TUint16>(leadForeign)); |
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121 else |
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122 { |
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123 if((i+1)<foreignLength) |
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124 tailForeign = aForeign[i+1]; |
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125 |
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126 const TLeadOrSingle* structPtr = TConvDataStruct::KFirstByteConversions + (leadForeign-0x80); |
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127 |
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128 if(structPtr->iUnicodeIfSingle) |
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129 aUnicode.Append(structPtr->iUnicodeIfSingle); |
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130 else |
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131 { |
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132 if(TConvDataStruct::KMinTrailByte<=tailForeign && tailForeign<=TConvDataStruct::KMaxTrailByte) |
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133 aUnicode.Append(TConvDataStruct::KDoubleByteConversions[structPtr->iDoubleByteIndex+ |
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134 (tailForeign - TConvDataStruct::KMinTrailByte)]); |
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135 else |
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136 aUnicode.Append(0xFFFD); |
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137 i++; |
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138 } |
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139 } |
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140 } |
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141 |
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142 return KErrNone; |
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143 } |
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144 |
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145 TBool UnicodeConv::IsLegalShortNameCharacter (TUint aCharacter) |
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146 { |
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147 //1. aCharacter >= 0x0080 |
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148 if (aCharacter>=0x0080) |
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149 { |
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150 if (aCharacter>0xFFFF) |
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151 return EFalse; |
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152 |
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153 TInt trailByte = KErrNotFound; |
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154 TInt returnValue = TConvDataStruct::ConvertSingleUnicode(aCharacter,trailByte); |
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155 |
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156 if(returnValue!=KErrNotFound) |
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157 return ETrue; |
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158 else |
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159 return EFalse; |
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160 } |
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161 |
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162 // For most common cases: |
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163 // Note: lower case characters are considered legal DOS char here. |
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164 if ((aCharacter>='a' && aCharacter<='z') || |
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165 (aCharacter>='A' && aCharacter<='Z') || |
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166 (aCharacter>='0' && aCharacter<='9')) |
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167 { |
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168 return ETrue; |
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169 } |
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170 // Checking for illegal chars: |
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171 // 2. aCharacter <= 0x20 |
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172 // Note: leading 0x05 byte should be guarded by callers of this function |
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173 // as the information of the position of the character is required. |
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174 if (aCharacter < 0x20) |
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175 return EFalse; |
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176 // Space (' ') is not considered as a legal DOS char here. |
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177 if (aCharacter == 0x20) |
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178 return EFalse; |
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179 |
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180 // 3. 0x20 < aCharacter < 0x80 |
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181 // According to FAT Spec, "following characters are not legal in any bytes of DIR_Name": |
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182 switch (aCharacter) |
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183 { |
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184 case 0x22: // '"' |
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185 case 0x2A: // '*' |
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186 case 0x2B: // '+' |
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187 case 0x2C: // ',' |
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188 //case 0x2E: // '.' // Although '.' is not allowed in any bytes of DIR_Name, it |
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189 // is a valid character in short file names. |
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190 case 0x2F: // '/' |
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191 case 0x3A: // ':' |
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192 case 0x3B: // ';' |
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193 case 0x3C: // '<' |
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194 case 0x3D: // '=' |
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195 case 0x3E: // '>' |
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196 case 0x3F: // '?' |
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197 case 0x5B: // '[' |
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198 case 0x5C: // '\' |
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199 case 0x5D: // ']' |
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200 case 0x7C: // '|' |
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201 return EFalse; |
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202 default: |
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203 return ETrue; |
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204 } |
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205 } |
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206 |