1 /*===--- ConvertUTF.h - Universal Character Names conversions ---------------===
3 * The LLVM Compiler Infrastructure
5 * This file is distributed under the University of Illinois Open Source
6 * License. See LICENSE.TXT for details.
8 *==------------------------------------------------------------------------==*/
10 * Copyright 2001-2004 Unicode, Inc.
14 * This source code is provided as is by Unicode, Inc. No claims are
15 * made as to fitness for any particular purpose. No warranties of any
16 * kind are expressed or implied. The recipient agrees to determine
17 * applicability of information provided. If this file has been
18 * purchased on magnetic or optical media from Unicode, Inc., the
19 * sole remedy for any claim will be exchange of defective media
20 * within 90 days of receipt.
22 * Limitations on Rights to Redistribute This Code
24 * Unicode, Inc. hereby grants the right to freely use the information
25 * supplied in this file in the creation of products supporting the
26 * Unicode Standard, and to make copies of this file in any form
27 * for internal or external distribution as long as this notice
31 /* ---------------------------------------------------------------------
33 Conversions between UTF32, UTF-16, and UTF-8. Header file.
35 Several funtions are included here, forming a complete set of
36 conversions between the three formats. UTF-7 is not included
37 here, but is handled in a separate source file.
39 Each of these routines takes pointers to input buffers and output
40 buffers. The input buffers are const.
42 Each routine converts the text between *sourceStart and sourceEnd,
43 putting the result into the buffer between *targetStart and
44 targetEnd. Note: the end pointers are *after* the last item: e.g.
45 *(sourceEnd - 1) is the last item.
47 The return result indicates whether the conversion was successful,
48 and if not, whether the problem was in the source or target buffers.
49 (Only the first encountered problem is indicated.)
51 After the conversion, *sourceStart and *targetStart are both
52 updated to point to the end of last text successfully converted in
53 the respective buffers.
56 sourceStart - pointer to a pointer to the source buffer.
57 The contents of this are modified on return so that
58 it points at the next thing to be converted.
59 targetStart - similarly, pointer to pointer to the target buffer.
60 sourceEnd, targetEnd - respectively pointers to the ends of the
61 two buffers, for overflow checking only.
63 These conversion functions take a ConversionFlags argument. When this
64 flag is set to strict, both irregular sequences and isolated surrogates
65 will cause an error. When the flag is set to lenient, both irregular
66 sequences and isolated surrogates are converted.
68 Whether the flag is strict or lenient, all illegal sequences will cause
69 an error return. This includes sequences such as: <F4 90 80 80>, <C0 80>,
70 or <A0> in UTF-8, and values above 0x10FFFF in UTF-32. Conformant code
71 must check for illegal sequences.
73 When the flag is set to lenient, characters over 0x10FFFF are converted
74 to the replacement character; otherwise (when the flag is set to strict)
75 they constitute an error.
78 The value "sourceIllegal" is returned from some routines if the input
79 sequence is malformed. When "sourceIllegal" is returned, the source
80 value will point to the illegal value that caused the problem. E.g.,
81 in UTF-8 when a sequence is malformed, it points to the start of the
84 Author: Mark E. Davis, 1994.
85 Rev History: Rick McGowan, fixes & updates May 2001.
86 Fixes & updates, Sept 2001.
88 ------------------------------------------------------------------------ */
90 #ifndef LLVM_SUPPORT_CONVERTUTF_H
91 #define LLVM_SUPPORT_CONVERTUTF_H
95 #include <system_error>
97 // Wrap everything in namespace llvm so that programs can link with llvm and
98 // their own version of the unicode libraries.
102 /* ---------------------------------------------------------------------
103 The following 4 definitions are compiler-specific.
104 The C standard does not guarantee that wchar_t has at least
105 16 bits, so wchar_t is no less portable than unsigned short!
106 All should be unsigned values to avoid sign extension during
107 bit mask & shift operations.
108 ------------------------------------------------------------------------ */
110 typedef unsigned int UTF32; /* at least 32 bits */
111 typedef unsigned short UTF16; /* at least 16 bits */
112 typedef unsigned char UTF8; /* typically 8 bits */
113 typedef unsigned char Boolean; /* 0 or 1 */
115 /* Some fundamental constants */
116 #define UNI_REPLACEMENT_CHAR (UTF32)0x0000FFFD
117 #define UNI_MAX_BMP (UTF32)0x0000FFFF
118 #define UNI_MAX_UTF16 (UTF32)0x0010FFFF
119 #define UNI_MAX_UTF32 (UTF32)0x7FFFFFFF
120 #define UNI_MAX_LEGAL_UTF32 (UTF32)0x0010FFFF
122 #define UNI_MAX_UTF8_BYTES_PER_CODE_POINT 4
124 #define UNI_UTF16_BYTE_ORDER_MARK_NATIVE 0xFEFF
125 #define UNI_UTF16_BYTE_ORDER_MARK_SWAPPED 0xFFFE
128 conversionOK, /* conversion successful */
129 sourceExhausted, /* partial character in source, but hit end */
130 targetExhausted, /* insuff. room in target for conversion */
131 sourceIllegal /* source sequence is illegal/malformed */
135 strictConversion = 0,
139 ConversionResult ConvertUTF8toUTF16 (
140 const UTF8** sourceStart, const UTF8* sourceEnd,
141 UTF16** targetStart, UTF16* targetEnd, ConversionFlags flags);
144 * Convert a partial UTF8 sequence to UTF32. If the sequence ends in an
145 * incomplete code unit sequence, returns \c sourceExhausted.
147 ConversionResult ConvertUTF8toUTF32Partial(
148 const UTF8** sourceStart, const UTF8* sourceEnd,
149 UTF32** targetStart, UTF32* targetEnd, ConversionFlags flags);
152 * Convert a partial UTF8 sequence to UTF32. If the sequence ends in an
153 * incomplete code unit sequence, returns \c sourceIllegal.
155 ConversionResult ConvertUTF8toUTF32(
156 const UTF8** sourceStart, const UTF8* sourceEnd,
157 UTF32** targetStart, UTF32* targetEnd, ConversionFlags flags);
159 ConversionResult ConvertUTF16toUTF8 (
160 const UTF16** sourceStart, const UTF16* sourceEnd,
161 UTF8** targetStart, UTF8* targetEnd, ConversionFlags flags);
163 ConversionResult ConvertUTF32toUTF8 (
164 const UTF32** sourceStart, const UTF32* sourceEnd,
165 UTF8** targetStart, UTF8* targetEnd, ConversionFlags flags);
167 ConversionResult ConvertUTF16toUTF32 (
168 const UTF16** sourceStart, const UTF16* sourceEnd,
169 UTF32** targetStart, UTF32* targetEnd, ConversionFlags flags);
171 ConversionResult ConvertUTF32toUTF16 (
172 const UTF32** sourceStart, const UTF32* sourceEnd,
173 UTF16** targetStart, UTF16* targetEnd, ConversionFlags flags);
175 Boolean isLegalUTF8Sequence(const UTF8 *source, const UTF8 *sourceEnd);
177 Boolean isLegalUTF8String(const UTF8 **source, const UTF8 *sourceEnd);
179 unsigned getNumBytesForUTF8(UTF8 firstByte);
181 /*************************************************************************/
182 /* Below are LLVM-specific wrappers of the functions above. */
184 template <typename T> class ArrayRef;
185 template <typename T> class SmallVectorImpl;
189 * Convert an UTF8 StringRef to UTF8, UTF16, or UTF32 depending on
190 * WideCharWidth. The converted data is written to ResultPtr, which needs to
191 * point to at least WideCharWidth * (Source.Size() + 1) bytes. On success,
192 * ResultPtr will point one after the end of the copied string. On failure,
193 * ResultPtr will not be changed, and ErrorPtr will be set to the location of
194 * the first character which could not be converted.
195 * \return true on success.
197 bool ConvertUTF8toWide(unsigned WideCharWidth, llvm::StringRef Source,
198 char *&ResultPtr, const UTF8 *&ErrorPtr);
201 * Converts a UTF-8 StringRef to a std::wstring.
202 * \return true on success.
204 bool ConvertUTF8toWide(llvm::StringRef Source, std::wstring &Result);
207 * Converts a UTF-8 C-string to a std::wstring.
208 * \return true on success.
210 bool ConvertUTF8toWide(const char *Source, std::wstring &Result);
213 * Converts a std::wstring to a UTF-8 encoded std::string.
214 * \return true on success.
216 bool convertWideToUTF8(const std::wstring &Source, std::string &Result);
220 * Convert an Unicode code point to UTF8 sequence.
222 * \param Source a Unicode code point.
223 * \param [in,out] ResultPtr pointer to the output buffer, needs to be at least
224 * \c UNI_MAX_UTF8_BYTES_PER_CODE_POINT bytes. On success \c ResultPtr is
225 * updated one past end of the converted sequence.
227 * \returns true on success.
229 bool ConvertCodePointToUTF8(unsigned Source, char *&ResultPtr);
232 * Convert the first UTF8 sequence in the given source buffer to a UTF32
235 * \param [in,out] source A pointer to the source buffer. If the conversion
236 * succeeds, this pointer will be updated to point to the byte just past the
237 * end of the converted sequence.
238 * \param sourceEnd A pointer just past the end of the source buffer.
239 * \param [out] target The converted code
240 * \param flags Whether the conversion is strict or lenient.
242 * \returns conversionOK on success
244 * \sa ConvertUTF8toUTF32
246 inline ConversionResult convertUTF8Sequence(const UTF8 **source,
247 const UTF8 *sourceEnd,
249 ConversionFlags flags) {
250 if (*source == sourceEnd)
251 return sourceExhausted;
252 unsigned size = getNumBytesForUTF8(**source);
253 if ((ptrdiff_t)size > sourceEnd - *source)
254 return sourceExhausted;
255 return ConvertUTF8toUTF32(source, *source + size, &target, target + 1, flags);
259 * Returns true if a blob of text starts with a UTF-16 big or little endian byte
262 bool hasUTF16ByteOrderMark(ArrayRef<char> SrcBytes);
265 * Converts a stream of raw bytes assumed to be UTF16 into a UTF8 std::string.
267 * \param [in] SrcBytes A buffer of what is assumed to be UTF-16 encoded text.
268 * \param [out] Out Converted UTF-8 is stored here on success.
269 * \returns true on success
271 bool convertUTF16ToUTF8String(ArrayRef<char> SrcBytes, std::string &Out);
274 * Converts a UTF16 string into a UTF8 std::string.
276 * \param [in] Src A buffer of UTF-16 encoded text.
277 * \param [out] Out Converted UTF-8 is stored here on success.
278 * \returns true on success
280 bool convertUTF16ToUTF8String(ArrayRef<UTF16> Src, std::string &Out);
283 * Converts a UTF-8 string into a UTF-16 string with native endianness.
285 * \returns true on success
287 bool convertUTF8ToUTF16String(StringRef SrcUTF8,
288 SmallVectorImpl<UTF16> &DstUTF16);
293 std::error_code UTF8ToUTF16(StringRef utf8, SmallVectorImpl<wchar_t> &utf16);
294 /// Convert to UTF16 from the current code page used in the system
295 std::error_code CurCPToUTF16(StringRef utf8, SmallVectorImpl<wchar_t> &utf16);
296 std::error_code UTF16ToUTF8(const wchar_t *utf16, size_t utf16_len,
297 SmallVectorImpl<char> &utf8);
298 /// Convert from UTF16 to the current code page used in the system
299 std::error_code UTF16ToCurCP(const wchar_t *utf16, size_t utf16_len,
300 SmallVectorImpl<char> &utf8);
301 } // namespace windows
305 } /* end namespace llvm */