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annotate include/llvm/Support/ConvertUTF.h @ 83:60c9769439b8 LLVM3.7

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LLVM 3.7
author Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
date Wed, 18 Feb 2015 14:55:36 +0900
parents 54457678186b
children 1172e4bd9c6f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*===--- ConvertUTF.h - Universal Character Names conversions ---------------===
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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 * Copyright 2001-2004 Unicode, Inc.
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11 *
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12 * Disclaimer
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13 *
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14 * This source code is provided as is by Unicode, Inc. No claims are
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15 * made as to fitness for any particular purpose. No warranties of any
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16 * kind are expressed or implied. The recipient agrees to determine
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17 * applicability of information provided. If this file has been
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18 * purchased on magnetic or optical media from Unicode, Inc., the
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19 * sole remedy for any claim will be exchange of defective media
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20 * within 90 days of receipt.
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21 *
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22 * Limitations on Rights to Redistribute This Code
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23 *
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24 * Unicode, Inc. hereby grants the right to freely use the information
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25 * supplied in this file in the creation of products supporting the
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26 * Unicode Standard, and to make copies of this file in any form
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27 * for internal or external distribution as long as this notice
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28 * remains attached.
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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 Conversions between UTF32, UTF-16, and UTF-8. Header file.
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34
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35 Several funtions are included here, forming a complete set of
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36 conversions between the three formats. UTF-7 is not included
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37 here, but is handled in a separate source file.
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38
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39 Each of these routines takes pointers to input buffers and output
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40 buffers. The input buffers are const.
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41
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42 Each routine converts the text between *sourceStart and sourceEnd,
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43 putting the result into the buffer between *targetStart and
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44 targetEnd. Note: the end pointers are *after* the last item: e.g.
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45 *(sourceEnd - 1) is the last item.
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46
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47 The return result indicates whether the conversion was successful,
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48 and if not, whether the problem was in the source or target buffers.
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49 (Only the first encountered problem is indicated.)
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50
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51 After the conversion, *sourceStart and *targetStart are both
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52 updated to point to the end of last text successfully converted in
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53 the respective buffers.
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54
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55 Input parameters:
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56 sourceStart - pointer to a pointer to the source buffer.
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57 The contents of this are modified on return so that
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58 it points at the next thing to be converted.
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59 targetStart - similarly, pointer to pointer to the target buffer.
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60 sourceEnd, targetEnd - respectively pointers to the ends of the
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61 two buffers, for overflow checking only.
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62
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63 These conversion functions take a ConversionFlags argument. When this
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64 flag is set to strict, both irregular sequences and isolated surrogates
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65 will cause an error. When the flag is set to lenient, both irregular
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66 sequences and isolated surrogates are converted.
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67
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68 Whether the flag is strict or lenient, all illegal sequences will cause
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69 an error return. This includes sequences such as: <F4 90 80 80>, <C0 80>,
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70 or <A0> in UTF-8, and values above 0x10FFFF in UTF-32. Conformant code
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71 must check for illegal sequences.
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72
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73 When the flag is set to lenient, characters over 0x10FFFF are converted
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74 to the replacement character; otherwise (when the flag is set to strict)
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75 they constitute an error.
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76
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77 Output parameters:
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78 The value "sourceIllegal" is returned from some routines if the input
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79 sequence is malformed. When "sourceIllegal" is returned, the source
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80 value will point to the illegal value that caused the problem. E.g.,
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81 in UTF-8 when a sequence is malformed, it points to the start of the
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82 malformed sequence.
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83
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84 Author: Mark E. Davis, 1994.
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85 Rev History: Rick McGowan, fixes & updates May 2001.
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86 Fixes & updates, Sept 2001.
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87
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88 ------------------------------------------------------------------------ */
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89
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90 #ifndef LLVM_SUPPORT_CONVERTUTF_H
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91 #define LLVM_SUPPORT_CONVERTUTF_H
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92
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93 /* ---------------------------------------------------------------------
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94 The following 4 definitions are compiler-specific.
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95 The C standard does not guarantee that wchar_t has at least
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96 16 bits, so wchar_t is no less portable than unsigned short!
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97 All should be unsigned values to avoid sign extension during
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98 bit mask & shift operations.
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99 ------------------------------------------------------------------------ */
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100
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101 typedef unsigned int UTF32; /* at least 32 bits */
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102 typedef unsigned short UTF16; /* at least 16 bits */
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103 typedef unsigned char UTF8; /* typically 8 bits */
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104 typedef unsigned char Boolean; /* 0 or 1 */
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105
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106 /* Some fundamental constants */
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107 #define UNI_REPLACEMENT_CHAR (UTF32)0x0000FFFD
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108 #define UNI_MAX_BMP (UTF32)0x0000FFFF
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109 #define UNI_MAX_UTF16 (UTF32)0x0010FFFF
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110 #define UNI_MAX_UTF32 (UTF32)0x7FFFFFFF
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111 #define UNI_MAX_LEGAL_UTF32 (UTF32)0x0010FFFF
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112
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113 #define UNI_MAX_UTF8_BYTES_PER_CODE_POINT 4
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114
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115 #define UNI_UTF16_BYTE_ORDER_MARK_NATIVE 0xFEFF
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116 #define UNI_UTF16_BYTE_ORDER_MARK_SWAPPED 0xFFFE
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117
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118 typedef enum {
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119 conversionOK, /* conversion successful */
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120 sourceExhausted, /* partial character in source, but hit end */
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121 targetExhausted, /* insuff. room in target for conversion */
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122 sourceIllegal /* source sequence is illegal/malformed */
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123 } ConversionResult;
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124
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125 typedef enum {
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126 strictConversion = 0,
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127 lenientConversion
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128 } ConversionFlags;
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129
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130 /* This is for C++ and does no harm in C */
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131 #ifdef __cplusplus
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132 extern "C" {
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133 #endif
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134
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135 ConversionResult ConvertUTF8toUTF16 (
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136 const UTF8** sourceStart, const UTF8* sourceEnd,
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137 UTF16** targetStart, UTF16* targetEnd, ConversionFlags flags);
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138
77
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139 /**
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140 * Convert a partial UTF8 sequence to UTF32. If the sequence ends in an
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141 * incomplete code unit sequence, returns \c sourceExhausted.
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142 */
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143 ConversionResult ConvertUTF8toUTF32Partial(
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144 const UTF8** sourceStart, const UTF8* sourceEnd,
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145 UTF32** targetStart, UTF32* targetEnd, ConversionFlags flags);
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146
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147 /**
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148 * Convert a partial UTF8 sequence to UTF32. If the sequence ends in an
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149 * incomplete code unit sequence, returns \c sourceIllegal.
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150 */
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151 ConversionResult ConvertUTF8toUTF32(
0
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152 const UTF8** sourceStart, const UTF8* sourceEnd,
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153 UTF32** targetStart, UTF32* targetEnd, ConversionFlags flags);
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154
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155 ConversionResult ConvertUTF16toUTF8 (
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156 const UTF16** sourceStart, const UTF16* sourceEnd,
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157 UTF8** targetStart, UTF8* targetEnd, ConversionFlags flags);
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158
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159 ConversionResult ConvertUTF32toUTF8 (
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160 const UTF32** sourceStart, const UTF32* sourceEnd,
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161 UTF8** targetStart, UTF8* targetEnd, ConversionFlags flags);
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162
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163 ConversionResult ConvertUTF16toUTF32 (
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164 const UTF16** sourceStart, const UTF16* sourceEnd,
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165 UTF32** targetStart, UTF32* targetEnd, ConversionFlags flags);
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166
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167 ConversionResult ConvertUTF32toUTF16 (
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168 const UTF32** sourceStart, const UTF32* sourceEnd,
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169 UTF16** targetStart, UTF16* targetEnd, ConversionFlags flags);
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170
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171 Boolean isLegalUTF8Sequence(const UTF8 *source, const UTF8 *sourceEnd);
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172
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173 Boolean isLegalUTF8String(const UTF8 **source, const UTF8 *sourceEnd);
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174
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175 unsigned getNumBytesForUTF8(UTF8 firstByte);
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176
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177 #ifdef __cplusplus
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178 }
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179
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180 /*************************************************************************/
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181 /* Below are LLVM-specific wrappers of the functions above. */
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182
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183 #include "llvm/ADT/ArrayRef.h"
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184 #include "llvm/ADT/StringRef.h"
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185
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186 namespace llvm {
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187
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188 /**
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189 * Convert an UTF8 StringRef to UTF8, UTF16, or UTF32 depending on
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190 * WideCharWidth. The converted data is written to ResultPtr, which needs to
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191 * point to at least WideCharWidth * (Source.Size() + 1) bytes. On success,
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192 * ResultPtr will point one after the end of the copied string. On failure,
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193 * ResultPtr will not be changed, and ErrorPtr will be set to the location of
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194 * the first character which could not be converted.
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195 * \return true on success.
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196 */
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197 bool ConvertUTF8toWide(unsigned WideCharWidth, llvm::StringRef Source,
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198 char *&ResultPtr, const UTF8 *&ErrorPtr);
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199
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200 /**
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201 * Convert an Unicode code point to UTF8 sequence.
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202 *
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203 * \param Source a Unicode code point.
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204 * \param [in,out] ResultPtr pointer to the output buffer, needs to be at least
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205 * \c UNI_MAX_UTF8_BYTES_PER_CODE_POINT bytes. On success \c ResultPtr is
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206 * updated one past end of the converted sequence.
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207 *
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208 * \returns true on success.
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209 */
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210 bool ConvertCodePointToUTF8(unsigned Source, char *&ResultPtr);
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211
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212 /**
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213 * Convert the first UTF8 sequence in the given source buffer to a UTF32
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214 * code point.
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215 *
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216 * \param [in,out] source A pointer to the source buffer. If the conversion
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217 * succeeds, this pointer will be updated to point to the byte just past the
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218 * end of the converted sequence.
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219 * \param sourceEnd A pointer just past the end of the source buffer.
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220 * \param [out] target The converted code
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221 * \param flags Whether the conversion is strict or lenient.
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222 *
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223 * \returns conversionOK on success
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224 *
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225 * \sa ConvertUTF8toUTF32
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226 */
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227 static inline ConversionResult convertUTF8Sequence(const UTF8 **source,
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228 const UTF8 *sourceEnd,
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229 UTF32 *target,
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230 ConversionFlags flags) {
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diff changeset
231 if (*source == sourceEnd)
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232 return sourceExhausted;
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233 unsigned size = getNumBytesForUTF8(**source);
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234 if ((ptrdiff_t)size > sourceEnd - *source)
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235 return sourceExhausted;
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diff changeset
236 return ConvertUTF8toUTF32(source, *source + size, &target, target + 1, flags);
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237 }
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diff changeset
238
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diff changeset
239 /**
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240 * Returns true if a blob of text starts with a UTF-16 big or little endian byte
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diff changeset
241 * order mark.
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242 */
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243 bool hasUTF16ByteOrderMark(ArrayRef<char> SrcBytes);
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244
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245 /**
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246 * Converts a stream of raw bytes assumed to be UTF16 into a UTF8 std::string.
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247 *
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248 * \param [in] SrcBytes A buffer of what is assumed to be UTF-16 encoded text.
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249 * \param [out] Out Converted UTF-8 is stored here on success.
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250 * \returns true on success
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251 */
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252 bool convertUTF16ToUTF8String(ArrayRef<char> SrcBytes, std::string &Out);
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253
83
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diff changeset
254 /**
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255 * Converts a UTF-8 string into a UTF-16 string with native endianness.
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diff changeset
256 *
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257 * \returns true on success
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diff changeset
258 */
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diff changeset
259 bool convertUTF8ToUTF16String(StringRef SrcUTF8,
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diff changeset
260 SmallVectorImpl<UTF16> &DstUTF16);
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diff changeset
261
0
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diff changeset
262 } /* end namespace llvm */
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263
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264 #endif
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265
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266 /* --------------------------------------------------------------------- */
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267
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268 #endif