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
173
174
175
176
177
178
179
180
181
182
183
184
185
186
|
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/strings/sys_string_conversions.h"
#import <Foundation/Foundation.h>
#include <vector>
#include "base/mac/foundation_util.h"
#include "base/mac/scoped_cftyperef.h"
#include "base/strings/string_piece.h"
namespace base {
namespace {
// Convert the supplied CFString into the specified encoding, and return it as
// an STL string of the template type. Returns an empty string on failure.
//
// Do not assert in this function since it is used by the asssertion code!
template<typename StringType>
static StringType CFStringToSTLStringWithEncodingT(CFStringRef cfstring,
CFStringEncoding encoding) {
CFIndex length = CFStringGetLength(cfstring);
if (length == 0)
return StringType();
CFRange whole_string = CFRangeMake(0, length);
CFIndex out_size;
CFIndex converted = CFStringGetBytes(cfstring,
whole_string,
encoding,
0, // lossByte
false, // isExternalRepresentation
NULL, // buffer
0, // maxBufLen
&out_size);
if (converted == 0 || out_size == 0)
return StringType();
// out_size is the number of UInt8-sized units needed in the destination.
// A buffer allocated as UInt8 units might not be properly aligned to
// contain elements of StringType::value_type. Use a container for the
// proper value_type, and convert out_size by figuring the number of
// value_type elements per UInt8. Leave room for a NUL terminator.
typename StringType::size_type elements =
out_size * sizeof(UInt8) / sizeof(typename StringType::value_type) + 1;
std::vector<typename StringType::value_type> out_buffer(elements);
converted = CFStringGetBytes(cfstring,
whole_string,
encoding,
0, // lossByte
false, // isExternalRepresentation
reinterpret_cast<UInt8*>(&out_buffer[0]),
out_size,
NULL); // usedBufLen
if (converted == 0)
return StringType();
out_buffer[elements - 1] = '\0';
return StringType(&out_buffer[0], elements - 1);
}
// Given an STL string |in| with an encoding specified by |in_encoding|,
// convert it to |out_encoding| and return it as an STL string of the
// |OutStringType| template type. Returns an empty string on failure.
//
// Do not assert in this function since it is used by the asssertion code!
template<typename InStringType, typename OutStringType>
static OutStringType STLStringToSTLStringWithEncodingsT(
const InStringType& in,
CFStringEncoding in_encoding,
CFStringEncoding out_encoding) {
typename InStringType::size_type in_length = in.length();
if (in_length == 0)
return OutStringType();
base::ScopedCFTypeRef<CFStringRef> cfstring(CFStringCreateWithBytesNoCopy(
NULL,
reinterpret_cast<const UInt8*>(in.data()),
in_length * sizeof(typename InStringType::value_type),
in_encoding,
false,
kCFAllocatorNull));
if (!cfstring)
return OutStringType();
return CFStringToSTLStringWithEncodingT<OutStringType>(cfstring,
out_encoding);
}
// Given an STL string |in| with an encoding specified by |in_encoding|,
// return it as a CFStringRef. Returns NULL on failure.
template<typename StringType>
static CFStringRef STLStringToCFStringWithEncodingsT(
const StringType& in,
CFStringEncoding in_encoding) {
typename StringType::size_type in_length = in.length();
if (in_length == 0)
return CFSTR("");
return CFStringCreateWithBytes(kCFAllocatorDefault,
reinterpret_cast<const UInt8*>(in.data()),
in_length *
sizeof(typename StringType::value_type),
in_encoding,
false);
}
// Specify the byte ordering explicitly, otherwise CFString will be confused
// when strings don't carry BOMs, as they typically won't.
static const CFStringEncoding kNarrowStringEncoding = kCFStringEncodingUTF8;
#ifdef __BIG_ENDIAN__
static const CFStringEncoding kMediumStringEncoding = kCFStringEncodingUTF16BE;
static const CFStringEncoding kWideStringEncoding = kCFStringEncodingUTF32BE;
#elif defined(__LITTLE_ENDIAN__)
static const CFStringEncoding kMediumStringEncoding = kCFStringEncodingUTF16LE;
static const CFStringEncoding kWideStringEncoding = kCFStringEncodingUTF32LE;
#endif // __LITTLE_ENDIAN__
} // namespace
// Do not assert in this function since it is used by the asssertion code!
std::string SysWideToUTF8(const std::wstring& wide) {
return STLStringToSTLStringWithEncodingsT<std::wstring, std::string>(
wide, kWideStringEncoding, kNarrowStringEncoding);
}
// Do not assert in this function since it is used by the asssertion code!
std::wstring SysUTF8ToWide(const StringPiece& utf8) {
return STLStringToSTLStringWithEncodingsT<StringPiece, std::wstring>(
utf8, kNarrowStringEncoding, kWideStringEncoding);
}
std::string SysWideToNativeMB(const std::wstring& wide) {
return SysWideToUTF8(wide);
}
std::wstring SysNativeMBToWide(const StringPiece& native_mb) {
return SysUTF8ToWide(native_mb);
}
CFStringRef SysUTF8ToCFStringRef(const std::string& utf8) {
return STLStringToCFStringWithEncodingsT(utf8, kNarrowStringEncoding);
}
CFStringRef SysUTF16ToCFStringRef(const string16& utf16) {
return STLStringToCFStringWithEncodingsT(utf16, kMediumStringEncoding);
}
NSString* SysUTF8ToNSString(const std::string& utf8) {
return (NSString*)base::mac::CFTypeRefToNSObjectAutorelease(
SysUTF8ToCFStringRef(utf8));
}
NSString* SysUTF16ToNSString(const string16& utf16) {
return (NSString*)base::mac::CFTypeRefToNSObjectAutorelease(
SysUTF16ToCFStringRef(utf16));
}
std::string SysCFStringRefToUTF8(CFStringRef ref) {
return CFStringToSTLStringWithEncodingT<std::string>(ref,
kNarrowStringEncoding);
}
string16 SysCFStringRefToUTF16(CFStringRef ref) {
return CFStringToSTLStringWithEncodingT<string16>(ref,
kMediumStringEncoding);
}
std::string SysNSStringToUTF8(NSString* nsstring) {
if (!nsstring)
return std::string();
return SysCFStringRefToUTF8(reinterpret_cast<CFStringRef>(nsstring));
}
string16 SysNSStringToUTF16(NSString* nsstring) {
if (!nsstring)
return string16();
return SysCFStringRefToUTF16(reinterpret_cast<CFStringRef>(nsstring));
}
} // namespace base
|
