1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
//===-- ConvertUTFWrapper.cpp - Wrap ConvertUTF.h with clang data types -----===
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/Support/ConvertUTF.h"
#include "llvm/Support/SwapByteOrder.h"
#include <string>
#include <vector>
namespace llvm {
bool ConvertUTF8toWide(unsigned WideCharWidth, llvm::StringRef Source,
char *&ResultPtr, const UTF8 *&ErrorPtr) {
assert(WideCharWidth == 1 || WideCharWidth == 2 || WideCharWidth == 4);
ConversionResult result = conversionOK;
// Copy the character span over.
if (WideCharWidth == 1) {
const UTF8 *Pos = reinterpret_cast<const UTF8*>(Source.begin());
if (!isLegalUTF8String(&Pos, reinterpret_cast<const UTF8*>(Source.end()))) {
result = sourceIllegal;
ErrorPtr = Pos;
} else {
memcpy(ResultPtr, Source.data(), Source.size());
ResultPtr += Source.size();
}
} else if (WideCharWidth == 2) {
const UTF8 *sourceStart = (const UTF8*)Source.data();
// FIXME: Make the type of the result buffer correct instead of
// using reinterpret_cast.
UTF16 *targetStart = reinterpret_cast<UTF16*>(ResultPtr);
ConversionFlags flags = strictConversion;
result = ConvertUTF8toUTF16(
&sourceStart, sourceStart + Source.size(),
&targetStart, targetStart + 2*Source.size(), flags);
if (result == conversionOK)
ResultPtr = reinterpret_cast<char*>(targetStart);
else
ErrorPtr = sourceStart;
} else if (WideCharWidth == 4) {
const UTF8 *sourceStart = (const UTF8*)Source.data();
// FIXME: Make the type of the result buffer correct instead of
// using reinterpret_cast.
UTF32 *targetStart = reinterpret_cast<UTF32*>(ResultPtr);
ConversionFlags flags = strictConversion;
result = ConvertUTF8toUTF32(
&sourceStart, sourceStart + Source.size(),
&targetStart, targetStart + 4*Source.size(), flags);
if (result == conversionOK)
ResultPtr = reinterpret_cast<char*>(targetStart);
else
ErrorPtr = sourceStart;
}
assert((result != targetExhausted)
&& "ConvertUTF8toUTFXX exhausted target buffer");
return result == conversionOK;
}
bool ConvertCodePointToUTF8(unsigned Source, char *&ResultPtr) {
const UTF32 *SourceStart = &Source;
const UTF32 *SourceEnd = SourceStart + 1;
UTF8 *TargetStart = reinterpret_cast<UTF8 *>(ResultPtr);
UTF8 *TargetEnd = TargetStart + 4;
ConversionResult CR = ConvertUTF32toUTF8(&SourceStart, SourceEnd,
&TargetStart, TargetEnd,
strictConversion);
if (CR != conversionOK)
return false;
ResultPtr = reinterpret_cast<char*>(TargetStart);
return true;
}
bool hasUTF16ByteOrderMark(ArrayRef<char> S) {
return (S.size() >= 2 &&
((S[0] == '\xff' && S[1] == '\xfe') ||
(S[0] == '\xfe' && S[1] == '\xff')));
}
bool convertUTF16ToUTF8String(ArrayRef<char> SrcBytes, std::string &Out) {
assert(Out.empty());
// Error out on an uneven byte count.
if (SrcBytes.size() % 2)
return false;
// Avoid OOB by returning early on empty input.
if (SrcBytes.empty())
return true;
const UTF16 *Src = reinterpret_cast<const UTF16 *>(SrcBytes.begin());
const UTF16 *SrcEnd = reinterpret_cast<const UTF16 *>(SrcBytes.end());
// Byteswap if necessary.
std::vector<UTF16> ByteSwapped;
if (Src[0] == UNI_UTF16_BYTE_ORDER_MARK_SWAPPED) {
ByteSwapped.insert(ByteSwapped.end(), Src, SrcEnd);
for (unsigned I = 0, E = ByteSwapped.size(); I != E; ++I)
ByteSwapped[I] = llvm::sys::SwapByteOrder_16(ByteSwapped[I]);
Src = &ByteSwapped[0];
SrcEnd = &ByteSwapped[ByteSwapped.size() - 1] + 1;
}
// Skip the BOM for conversion.
if (Src[0] == UNI_UTF16_BYTE_ORDER_MARK_NATIVE)
Src++;
// Just allocate enough space up front. We'll shrink it later. Allocate
// enough that we can fit a null terminator without reallocating.
Out.resize(SrcBytes.size() * UNI_MAX_UTF8_BYTES_PER_CODE_POINT + 1);
UTF8 *Dst = reinterpret_cast<UTF8 *>(&Out[0]);
UTF8 *DstEnd = Dst + Out.size();
ConversionResult CR =
ConvertUTF16toUTF8(&Src, SrcEnd, &Dst, DstEnd, strictConversion);
assert(CR != targetExhausted);
if (CR != conversionOK) {
Out.clear();
return false;
}
Out.resize(reinterpret_cast<char *>(Dst) - &Out[0]);
Out.push_back(0);
Out.pop_back();
return true;
}
bool convertUTF8ToUTF16String(StringRef SrcUTF8,
SmallVectorImpl<UTF16> &DstUTF16) {
assert(DstUTF16.empty());
// Avoid OOB by returning early on empty input.
if (SrcUTF8.empty()) {
DstUTF16.push_back(0);
DstUTF16.pop_back();
return true;
}
const UTF8 *Src = reinterpret_cast<const UTF8 *>(SrcUTF8.begin());
const UTF8 *SrcEnd = reinterpret_cast<const UTF8 *>(SrcUTF8.end());
// Allocate the same number of UTF-16 code units as UTF-8 code units. Encoding
// as UTF-16 should always require the same amount or less code units than the
// UTF-8 encoding. Allocate one extra byte for the null terminator though,
// so that someone calling DstUTF16.data() gets a null terminated string.
// We resize down later so we don't have to worry that this over allocates.
DstUTF16.resize(SrcUTF8.size()+1);
UTF16 *Dst = &DstUTF16[0];
UTF16 *DstEnd = Dst + DstUTF16.size();
ConversionResult CR =
ConvertUTF8toUTF16(&Src, SrcEnd, &Dst, DstEnd, strictConversion);
assert(CR != targetExhausted);
if (CR != conversionOK) {
DstUTF16.clear();
return false;
}
DstUTF16.resize(Dst - &DstUTF16[0]);
DstUTF16.push_back(0);
DstUTF16.pop_back();
return true;
}
} // end namespace llvm
|
