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comparison: intl/uconv/util/nsUnicodeDecodeHelper.cpp
intl/uconv/util/nsUnicodeDecodeHelper.cpp
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #include "unicpriv.h" | |
| 7 #include "nsUnicodeDecodeHelper.h" | |
| 8 #include "nsAutoPtr.h" | |
| 9 | |
| 10 //---------------------------------------------------------------------- | |
| 11 // Class nsUnicodeDecodeHelper [implementation] | |
| 12 nsresult nsUnicodeDecodeHelper::ConvertByTable( | |
| 13 const char * aSrc, | |
| 14 int32_t * aSrcLength, | |
| 15 char16_t * aDest, | |
| 16 int32_t * aDestLength, | |
| 17 uScanClassID aScanClass, | |
| 18 uShiftInTable * aShiftInTable, | |
| 19 uMappingTable * aMappingTable, | |
| 20 bool aErrorSignal) | |
| 21 { | |
| 22 const char * src = aSrc; | |
| 23 int32_t srcLen = *aSrcLength; | |
| 24 char16_t * dest = aDest; | |
| 25 char16_t * destEnd = aDest + *aDestLength; | |
| 26 | |
| 27 char16_t med; | |
| 28 int32_t bcr; // byte count for read | |
| 29 nsresult res = NS_OK; | |
| 30 | |
| 31 while ((srcLen > 0) && (dest < destEnd)) { | |
| 32 bool charFound; | |
| 33 if (aScanClass == uMultibytesCharset) { | |
| 34 NS_ASSERTION(aShiftInTable, "shift table missing"); | |
| 35 charFound = uScanShift(aShiftInTable, nullptr, (uint8_t *)src, | |
| 36 reinterpret_cast<uint16_t*>(&med), srcLen, | |
| 37 (uint32_t *)&bcr); | |
| 38 } else { | |
| 39 charFound = uScan(aScanClass, nullptr, (uint8_t *)src, | |
| 40 reinterpret_cast<uint16_t*>(&med), | |
| 41 srcLen, (uint32_t *)&bcr); | |
| 42 } | |
| 43 if (!charFound) { | |
| 44 res = NS_OK_UDEC_MOREINPUT; | |
| 45 break; | |
| 46 } | |
| 47 | |
| 48 if (!uMapCode((uTable*) aMappingTable, static_cast<uint16_t>(med), reinterpret_cast<uint16_t*>(dest))) { | |
| 49 if (med < 0x20) { | |
| 50 // somehow some table miss the 0x00 - 0x20 part | |
| 51 *dest = med; | |
| 52 } else { | |
| 53 if (aErrorSignal) { | |
| 54 res = NS_ERROR_ILLEGAL_INPUT; | |
| 55 break; | |
| 56 } | |
| 57 // Unicode replacement value for unmappable chars | |
| 58 *dest = 0xfffd; | |
| 59 } | |
| 60 } | |
| 61 | |
| 62 src += bcr; | |
| 63 srcLen -= bcr; | |
| 64 dest++; | |
| 65 } | |
| 66 | |
| 67 if ((srcLen > 0) && (res == NS_OK)) res = NS_OK_UDEC_MOREOUTPUT; | |
| 68 | |
| 69 *aSrcLength = src - aSrc; | |
| 70 *aDestLength = dest - aDest; | |
| 71 return res; | |
| 72 } | |
| 73 | |
| 74 nsresult nsUnicodeDecodeHelper::ConvertByMultiTable( | |
| 75 const char * aSrc, | |
| 76 int32_t * aSrcLength, | |
| 77 char16_t * aDest, | |
| 78 int32_t * aDestLength, | |
| 79 int32_t aTableCount, | |
| 80 const uRange * aRangeArray, | |
| 81 uScanClassID * aScanClassArray, | |
| 82 uMappingTable ** aMappingTable, | |
| 83 bool aErrorSignal) | |
| 84 { | |
| 85 uint8_t * src = (uint8_t *)aSrc; | |
| 86 int32_t srcLen = *aSrcLength; | |
| 87 char16_t * dest = aDest; | |
| 88 char16_t * destEnd = aDest + *aDestLength; | |
| 89 | |
| 90 char16_t med; | |
| 91 int32_t bcr; // byte count for read | |
| 92 nsresult res = NS_OK; | |
| 93 int32_t i; | |
| 94 | |
| 95 while ((srcLen > 0) && (dest < destEnd)) | |
| 96 { | |
| 97 bool done= false; | |
| 98 bool passRangeCheck = false; | |
| 99 bool passScan = false; | |
| 100 for (i=0; (!done) && (i<aTableCount); i++) | |
| 101 { | |
| 102 if ((aRangeArray[i].min <= *src) && (*src <= aRangeArray[i].max)) | |
| 103 { | |
| 104 passRangeCheck = true; | |
| 105 if (uScan(aScanClassArray[i], nullptr, src, | |
| 106 reinterpret_cast<uint16_t*>(&med), srcLen, | |
| 107 (uint32_t *)&bcr)) | |
| 108 { | |
| 109 passScan = true; | |
| 110 done = uMapCode((uTable*) aMappingTable[i], | |
| 111 static_cast<uint16_t>(med), | |
| 112 reinterpret_cast<uint16_t*>(dest)); | |
| 113 } // if (uScan ... ) | |
| 114 } // if Range | |
| 115 } // for loop | |
| 116 | |
| 117 if(passRangeCheck && (! passScan)) | |
| 118 { | |
| 119 if (res != NS_ERROR_ILLEGAL_INPUT) | |
| 120 res = NS_OK_UDEC_MOREINPUT; | |
| 121 break; | |
| 122 } | |
| 123 if(! done) | |
| 124 { | |
| 125 bcr = 1; | |
| 126 if ((uint8_t)*src < 0x20) { | |
| 127 // somehow some table miss the 0x00 - 0x20 part | |
| 128 *dest = *src; | |
| 129 } else if(*src == (uint8_t) 0xa0) { | |
| 130 // handle nbsp | |
| 131 *dest = 0x00a0; | |
| 132 } else { | |
| 133 // we need to decide how many byte we skip. We can use uScan to do this | |
| 134 for (i=0; i<aTableCount; i++) | |
| 135 { | |
| 136 if ((aRangeArray[i].min <= *src) && (*src <= aRangeArray[i].max)) | |
| 137 { | |
| 138 if (uScan(aScanClassArray[i], nullptr, src, | |
| 139 reinterpret_cast<uint16_t*>(&med), srcLen, | |
| 140 (uint32_t*)&bcr)) | |
| 141 { | |
| 142 // match the patten | |
| 143 | |
| 144 int32_t k; | |
| 145 for(k = 1; k < bcr; k++) | |
| 146 { | |
| 147 if(0 == (src[k] & 0x80)) | |
| 148 { // only skip if all bytes > 0x80 | |
| 149 // if we hit bytes <= 0x80, skip only one byte | |
| 150 bcr = 1; | |
| 151 break; | |
| 152 } | |
| 153 } | |
| 154 break; | |
| 155 } | |
| 156 } | |
| 157 } | |
| 158 // treat it as NSBR if bcr == 1 and it is 0xa0 | |
| 159 if ((1==bcr)&&(*src == (uint8_t)0xa0 )) { | |
| 160 *dest = 0x00a0; | |
| 161 } else { | |
| 162 if (aErrorSignal) { | |
| 163 res = NS_ERROR_ILLEGAL_INPUT; | |
| 164 break; | |
| 165 } | |
| 166 *dest = 0xfffd; | |
| 167 } | |
| 168 } | |
| 169 } | |
| 170 | |
| 171 src += bcr; | |
| 172 srcLen -= bcr; | |
| 173 dest++; | |
| 174 } // while | |
| 175 | |
| 176 if ((srcLen > 0) && (res == NS_OK)) res = NS_OK_UDEC_MOREOUTPUT; | |
| 177 | |
| 178 *aSrcLength = src - (uint8_t *)aSrc; | |
| 179 *aDestLength = dest - aDest; | |
| 180 return res; | |
| 181 } | |
| 182 | |
| 183 nsresult nsUnicodeDecodeHelper::ConvertByFastTable( | |
| 184 const char * aSrc, | |
| 185 int32_t * aSrcLength, | |
| 186 char16_t * aDest, | |
| 187 int32_t * aDestLength, | |
| 188 const char16_t * aFastTable, | |
| 189 int32_t aTableSize, | |
| 190 bool aErrorSignal) | |
| 191 { | |
| 192 uint8_t * src = (uint8_t *)aSrc; | |
| 193 uint8_t * srcEnd = src; | |
| 194 char16_t * dest = aDest; | |
| 195 | |
| 196 nsresult res; | |
| 197 if (*aSrcLength > *aDestLength) { | |
| 198 srcEnd += (*aDestLength); | |
| 199 res = NS_PARTIAL_MORE_OUTPUT; | |
| 200 } else { | |
| 201 srcEnd += (*aSrcLength); | |
| 202 res = NS_OK; | |
| 203 } | |
| 204 | |
| 205 for (; src<srcEnd;) { | |
| 206 *dest = aFastTable[*src]; | |
| 207 if (*dest == 0xfffd && aErrorSignal) { | |
| 208 res = NS_ERROR_ILLEGAL_INPUT; | |
| 209 break; | |
| 210 } | |
| 211 src++; | |
| 212 dest++; | |
| 213 } | |
| 214 | |
| 215 *aSrcLength = src - (uint8_t *)aSrc; | |
| 216 *aDestLength = dest - aDest; | |
| 217 return res; | |
| 218 } | |
| 219 | |
| 220 nsresult nsUnicodeDecodeHelper::CreateFastTable( | |
| 221 uMappingTable * aMappingTable, | |
| 222 char16_t * aFastTable, | |
| 223 int32_t aTableSize) | |
| 224 { | |
| 225 int32_t tableSize = aTableSize; | |
| 226 int32_t buffSize = aTableSize; | |
| 227 nsAutoArrayPtr<char> buff(new char [buffSize]); | |
| 228 | |
| 229 char * p = buff; | |
| 230 for (int32_t i=0; i<aTableSize; i++) *(p++) = i; | |
| 231 return ConvertByTable(buff, &buffSize, aFastTable, &tableSize, | |
| 232 u1ByteCharset, nullptr, aMappingTable); | |
| 233 } | |
| 234 |
