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annotate lib/Support/ConvertUTFWrapper.cpp @ 77:54457678186b LLVM3.6

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LLVM 3.6
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Mon, 08 Sep 2014 22:06:00 +0900
parents 95c75e76d11b
children 60c9769439b8
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1 //===-- ConvertUTFWrapper.cpp - Wrap ConvertUTF.h with clang data types -----===
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9
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10 #include "llvm/Support/ConvertUTF.h"
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11 #include "llvm/Support/SwapByteOrder.h"
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12 #include <string>
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13 #include <vector>
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14
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15 namespace llvm {
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16
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17 bool ConvertUTF8toWide(unsigned WideCharWidth, llvm::StringRef Source,
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18 char *&ResultPtr, const UTF8 *&ErrorPtr) {
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19 assert(WideCharWidth == 1 || WideCharWidth == 2 || WideCharWidth == 4);
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20 ConversionResult result = conversionOK;
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21 // Copy the character span over.
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22 if (WideCharWidth == 1) {
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23 const UTF8 *Pos = reinterpret_cast<const UTF8*>(Source.begin());
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24 if (!isLegalUTF8String(&Pos, reinterpret_cast<const UTF8*>(Source.end()))) {
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25 result = sourceIllegal;
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26 ErrorPtr = Pos;
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27 } else {
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28 memcpy(ResultPtr, Source.data(), Source.size());
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29 ResultPtr += Source.size();
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30 }
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31 } else if (WideCharWidth == 2) {
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32 const UTF8 *sourceStart = (const UTF8*)Source.data();
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33 // FIXME: Make the type of the result buffer correct instead of
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34 // using reinterpret_cast.
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35 UTF16 *targetStart = reinterpret_cast<UTF16*>(ResultPtr);
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36 ConversionFlags flags = strictConversion;
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37 result = ConvertUTF8toUTF16(
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38 &sourceStart, sourceStart + Source.size(),
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39 &targetStart, targetStart + 2*Source.size(), flags);
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40 if (result == conversionOK)
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41 ResultPtr = reinterpret_cast<char*>(targetStart);
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42 else
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43 ErrorPtr = sourceStart;
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44 } else if (WideCharWidth == 4) {
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45 const UTF8 *sourceStart = (const UTF8*)Source.data();
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46 // FIXME: Make the type of the result buffer correct instead of
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47 // using reinterpret_cast.
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48 UTF32 *targetStart = reinterpret_cast<UTF32*>(ResultPtr);
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49 ConversionFlags flags = strictConversion;
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50 result = ConvertUTF8toUTF32(
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51 &sourceStart, sourceStart + Source.size(),
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52 &targetStart, targetStart + 4*Source.size(), flags);
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53 if (result == conversionOK)
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54 ResultPtr = reinterpret_cast<char*>(targetStart);
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55 else
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56 ErrorPtr = sourceStart;
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57 }
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58 assert((result != targetExhausted)
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59 && "ConvertUTF8toUTFXX exhausted target buffer");
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60 return result == conversionOK;
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61 }
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62
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63 bool ConvertCodePointToUTF8(unsigned Source, char *&ResultPtr) {
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64 const UTF32 *SourceStart = &Source;
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65 const UTF32 *SourceEnd = SourceStart + 1;
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66 UTF8 *TargetStart = reinterpret_cast<UTF8 *>(ResultPtr);
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67 UTF8 *TargetEnd = TargetStart + 4;
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68 ConversionResult CR = ConvertUTF32toUTF8(&SourceStart, SourceEnd,
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69 &TargetStart, TargetEnd,
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70 strictConversion);
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71 if (CR != conversionOK)
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72 return false;
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73
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74 ResultPtr = reinterpret_cast<char*>(TargetStart);
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75 return true;
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76 }
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77
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78 bool hasUTF16ByteOrderMark(ArrayRef<char> S) {
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79 return (S.size() >= 2 &&
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80 ((S[0] == '\xff' && S[1] == '\xfe') ||
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81 (S[0] == '\xfe' && S[1] == '\xff')));
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82 }
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83
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84 bool convertUTF16ToUTF8String(ArrayRef<char> SrcBytes, std::string &Out) {
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85 assert(Out.empty());
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86
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87 // Error out on an uneven byte count.
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88 if (SrcBytes.size() % 2)
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89 return false;
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90
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91 // Avoid OOB by returning early on empty input.
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92 if (SrcBytes.empty())
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93 return true;
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94
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95 const UTF16 *Src = reinterpret_cast<const UTF16 *>(SrcBytes.begin());
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96 const UTF16 *SrcEnd = reinterpret_cast<const UTF16 *>(SrcBytes.end());
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97
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98 // Byteswap if necessary.
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99 std::vector<UTF16> ByteSwapped;
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100 if (Src[0] == UNI_UTF16_BYTE_ORDER_MARK_SWAPPED) {
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101 ByteSwapped.insert(ByteSwapped.end(), Src, SrcEnd);
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102 for (unsigned I = 0, E = ByteSwapped.size(); I != E; ++I)
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103 ByteSwapped[I] = llvm::sys::SwapByteOrder_16(ByteSwapped[I]);
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104 Src = &ByteSwapped[0];
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105 SrcEnd = &ByteSwapped[ByteSwapped.size() - 1] + 1;
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106 }
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107
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108 // Skip the BOM for conversion.
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109 if (Src[0] == UNI_UTF16_BYTE_ORDER_MARK_NATIVE)
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110 Src++;
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111
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112 // Just allocate enough space up front. We'll shrink it later.
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113 Out.resize(SrcBytes.size() * UNI_MAX_UTF8_BYTES_PER_CODE_POINT);
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114 UTF8 *Dst = reinterpret_cast<UTF8 *>(&Out[0]);
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115 UTF8 *DstEnd = Dst + Out.size();
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116
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117 ConversionResult CR =
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118 ConvertUTF16toUTF8(&Src, SrcEnd, &Dst, DstEnd, strictConversion);
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119 assert(CR != targetExhausted);
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120
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121 if (CR != conversionOK) {
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122 Out.clear();
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123 return false;
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124 }
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125
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126 Out.resize(reinterpret_cast<char *>(Dst) - &Out[0]);
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127 return true;
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128 }
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
129
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
130 } // end namespace llvm
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
131