1 //===-- ConvertUTFWrapper.cpp - Wrap ConvertUTF.h with clang data types -----===
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9
10 #include "llvm/Support/ConvertUTF.h"
11 #include "llvm/ADT/ArrayRef.h"
12 #include "llvm/ADT/StringRef.h"
13 #include "llvm/Support/ErrorHandling.h"
14 #include "llvm/Support/SwapByteOrder.h"
15 #include <string>
16 #include <vector>
17
18 namespace llvm {
19
ConvertUTF8toWide(unsigned WideCharWidth,llvm::StringRef Source,char * & ResultPtr,const UTF8 * & ErrorPtr)20 bool ConvertUTF8toWide(unsigned WideCharWidth, llvm::StringRef Source,
21 char *&ResultPtr, const UTF8 *&ErrorPtr) {
22 assert(WideCharWidth == 1 || WideCharWidth == 2 || WideCharWidth == 4);
23 ConversionResult result = conversionOK;
24 // Copy the character span over.
25 if (WideCharWidth == 1) {
26 const UTF8 *Pos = reinterpret_cast<const UTF8*>(Source.begin());
27 if (!isLegalUTF8String(&Pos, reinterpret_cast<const UTF8*>(Source.end()))) {
28 result = sourceIllegal;
29 ErrorPtr = Pos;
30 } else {
31 memcpy(ResultPtr, Source.data(), Source.size());
32 ResultPtr += Source.size();
33 }
34 } else if (WideCharWidth == 2) {
35 const UTF8 *sourceStart = (const UTF8*)Source.data();
36 // FIXME: Make the type of the result buffer correct instead of
37 // using reinterpret_cast.
38 UTF16 *targetStart = reinterpret_cast<UTF16*>(ResultPtr);
39 ConversionFlags flags = strictConversion;
40 result = ConvertUTF8toUTF16(
41 &sourceStart, sourceStart + Source.size(),
42 &targetStart, targetStart + Source.size(), flags);
43 if (result == conversionOK)
44 ResultPtr = reinterpret_cast<char*>(targetStart);
45 else
46 ErrorPtr = sourceStart;
47 } else if (WideCharWidth == 4) {
48 const UTF8 *sourceStart = (const UTF8*)Source.data();
49 // FIXME: Make the type of the result buffer correct instead of
50 // using reinterpret_cast.
51 UTF32 *targetStart = reinterpret_cast<UTF32*>(ResultPtr);
52 ConversionFlags flags = strictConversion;
53 result = ConvertUTF8toUTF32(
54 &sourceStart, sourceStart + Source.size(),
55 &targetStart, targetStart + Source.size(), flags);
56 if (result == conversionOK)
57 ResultPtr = reinterpret_cast<char*>(targetStart);
58 else
59 ErrorPtr = sourceStart;
60 }
61 assert((result != targetExhausted)
62 && "ConvertUTF8toUTFXX exhausted target buffer");
63 return result == conversionOK;
64 }
65
ConvertCodePointToUTF8(unsigned Source,char * & ResultPtr)66 bool ConvertCodePointToUTF8(unsigned Source, char *&ResultPtr) {
67 const UTF32 *SourceStart = &Source;
68 const UTF32 *SourceEnd = SourceStart + 1;
69 UTF8 *TargetStart = reinterpret_cast<UTF8 *>(ResultPtr);
70 UTF8 *TargetEnd = TargetStart + 4;
71 ConversionResult CR = ConvertUTF32toUTF8(&SourceStart, SourceEnd,
72 &TargetStart, TargetEnd,
73 strictConversion);
74 if (CR != conversionOK)
75 return false;
76
77 ResultPtr = reinterpret_cast<char*>(TargetStart);
78 return true;
79 }
80
hasUTF16ByteOrderMark(ArrayRef<char> S)81 bool hasUTF16ByteOrderMark(ArrayRef<char> S) {
82 return (S.size() >= 2 &&
83 ((S[0] == '\xff' && S[1] == '\xfe') ||
84 (S[0] == '\xfe' && S[1] == '\xff')));
85 }
86
convertUTF16ToUTF8String(ArrayRef<char> SrcBytes,std::string & Out)87 bool convertUTF16ToUTF8String(ArrayRef<char> SrcBytes, std::string &Out) {
88 assert(Out.empty());
89
90 // Error out on an uneven byte count.
91 if (SrcBytes.size() % 2)
92 return false;
93
94 // Avoid OOB by returning early on empty input.
95 if (SrcBytes.empty())
96 return true;
97
98 const UTF16 *Src = reinterpret_cast<const UTF16 *>(SrcBytes.begin());
99 const UTF16 *SrcEnd = reinterpret_cast<const UTF16 *>(SrcBytes.end());
100
101 // Byteswap if necessary.
102 std::vector<UTF16> ByteSwapped;
103 if (Src[0] == UNI_UTF16_BYTE_ORDER_MARK_SWAPPED) {
104 ByteSwapped.insert(ByteSwapped.end(), Src, SrcEnd);
105 for (unsigned I = 0, E = ByteSwapped.size(); I != E; ++I)
106 ByteSwapped[I] = llvm::sys::SwapByteOrder_16(ByteSwapped[I]);
107 Src = &ByteSwapped[0];
108 SrcEnd = &ByteSwapped[ByteSwapped.size() - 1] + 1;
109 }
110
111 // Skip the BOM for conversion.
112 if (Src[0] == UNI_UTF16_BYTE_ORDER_MARK_NATIVE)
113 Src++;
114
115 // Just allocate enough space up front. We'll shrink it later. Allocate
116 // enough that we can fit a null terminator without reallocating.
117 Out.resize(SrcBytes.size() * UNI_MAX_UTF8_BYTES_PER_CODE_POINT + 1);
118 UTF8 *Dst = reinterpret_cast<UTF8 *>(&Out[0]);
119 UTF8 *DstEnd = Dst + Out.size();
120
121 ConversionResult CR =
122 ConvertUTF16toUTF8(&Src, SrcEnd, &Dst, DstEnd, strictConversion);
123 assert(CR != targetExhausted);
124
125 if (CR != conversionOK) {
126 Out.clear();
127 return false;
128 }
129
130 Out.resize(reinterpret_cast<char *>(Dst) - &Out[0]);
131 Out.push_back(0);
132 Out.pop_back();
133 return true;
134 }
135
convertUTF16ToUTF8String(ArrayRef<UTF16> Src,std::string & Out)136 bool convertUTF16ToUTF8String(ArrayRef<UTF16> Src, std::string &Out)
137 {
138 return convertUTF16ToUTF8String(
139 llvm::ArrayRef<char>(reinterpret_cast<const char *>(Src.data()),
140 Src.size() * sizeof(UTF16)), Out);
141 }
142
convertUTF8ToUTF16String(StringRef SrcUTF8,SmallVectorImpl<UTF16> & DstUTF16)143 bool convertUTF8ToUTF16String(StringRef SrcUTF8,
144 SmallVectorImpl<UTF16> &DstUTF16) {
145 assert(DstUTF16.empty());
146
147 // Avoid OOB by returning early on empty input.
148 if (SrcUTF8.empty()) {
149 DstUTF16.push_back(0);
150 DstUTF16.pop_back();
151 return true;
152 }
153
154 const UTF8 *Src = reinterpret_cast<const UTF8 *>(SrcUTF8.begin());
155 const UTF8 *SrcEnd = reinterpret_cast<const UTF8 *>(SrcUTF8.end());
156
157 // Allocate the same number of UTF-16 code units as UTF-8 code units. Encoding
158 // as UTF-16 should always require the same amount or less code units than the
159 // UTF-8 encoding. Allocate one extra byte for the null terminator though,
160 // so that someone calling DstUTF16.data() gets a null terminated string.
161 // We resize down later so we don't have to worry that this over allocates.
162 DstUTF16.resize(SrcUTF8.size()+1);
163 UTF16 *Dst = &DstUTF16[0];
164 UTF16 *DstEnd = Dst + DstUTF16.size();
165
166 ConversionResult CR =
167 ConvertUTF8toUTF16(&Src, SrcEnd, &Dst, DstEnd, strictConversion);
168 assert(CR != targetExhausted);
169
170 if (CR != conversionOK) {
171 DstUTF16.clear();
172 return false;
173 }
174
175 DstUTF16.resize(Dst - &DstUTF16[0]);
176 DstUTF16.push_back(0);
177 DstUTF16.pop_back();
178 return true;
179 }
180
181 static_assert(sizeof(wchar_t) == 1 || sizeof(wchar_t) == 2 ||
182 sizeof(wchar_t) == 4,
183 "Expected wchar_t to be 1, 2, or 4 bytes");
184
185 template <typename TResult>
ConvertUTF8toWideInternal(llvm::StringRef Source,TResult & Result)186 static inline bool ConvertUTF8toWideInternal(llvm::StringRef Source,
187 TResult &Result) {
188 // Even in the case of UTF-16, the number of bytes in a UTF-8 string is
189 // at least as large as the number of elements in the resulting wide
190 // string, because surrogate pairs take at least 4 bytes in UTF-8.
191 Result.resize(Source.size() + 1);
192 char *ResultPtr = reinterpret_cast<char *>(&Result[0]);
193 const UTF8 *ErrorPtr;
194 if (!ConvertUTF8toWide(sizeof(wchar_t), Source, ResultPtr, ErrorPtr)) {
195 Result.clear();
196 return false;
197 }
198 Result.resize(reinterpret_cast<wchar_t *>(ResultPtr) - &Result[0]);
199 return true;
200 }
201
ConvertUTF8toWide(llvm::StringRef Source,std::wstring & Result)202 bool ConvertUTF8toWide(llvm::StringRef Source, std::wstring &Result) {
203 return ConvertUTF8toWideInternal(Source, Result);
204 }
205
ConvertUTF8toWide(const char * Source,std::wstring & Result)206 bool ConvertUTF8toWide(const char *Source, std::wstring &Result) {
207 if (!Source) {
208 Result.clear();
209 return true;
210 }
211 return ConvertUTF8toWide(llvm::StringRef(Source), Result);
212 }
213
convertWideToUTF8(const std::wstring & Source,std::string & Result)214 bool convertWideToUTF8(const std::wstring &Source, std::string &Result) {
215 if (sizeof(wchar_t) == 1) {
216 const UTF8 *Start = reinterpret_cast<const UTF8 *>(Source.data());
217 const UTF8 *End =
218 reinterpret_cast<const UTF8 *>(Source.data() + Source.size());
219 if (!isLegalUTF8String(&Start, End))
220 return false;
221 Result.resize(Source.size());
222 memcpy(&Result[0], Source.data(), Source.size());
223 return true;
224 } else if (sizeof(wchar_t) == 2) {
225 return convertUTF16ToUTF8String(
226 llvm::ArrayRef<UTF16>(reinterpret_cast<const UTF16 *>(Source.data()),
227 Source.size()),
228 Result);
229 } else if (sizeof(wchar_t) == 4) {
230 const UTF32 *Start = reinterpret_cast<const UTF32 *>(Source.data());
231 const UTF32 *End =
232 reinterpret_cast<const UTF32 *>(Source.data() + Source.size());
233 Result.resize(UNI_MAX_UTF8_BYTES_PER_CODE_POINT * Source.size());
234 UTF8 *ResultPtr = reinterpret_cast<UTF8 *>(&Result[0]);
235 UTF8 *ResultEnd = reinterpret_cast<UTF8 *>(&Result[0] + Result.size());
236 if (ConvertUTF32toUTF8(&Start, End, &ResultPtr, ResultEnd,
237 strictConversion) == conversionOK) {
238 Result.resize(reinterpret_cast<char *>(ResultPtr) - &Result[0]);
239 return true;
240 } else {
241 Result.clear();
242 return false;
243 }
244 } else {
245 llvm_unreachable(
246 "Control should never reach this point; see static_assert further up");
247 }
248 }
249
250 } // end namespace llvm
251
252