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
|
/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "libcore_util_CharsetUtils.h"
#include <string.h>
#include "dex/utf-inl.h"
#include "handle_scope-inl.h"
#include "jni/jni_internal.h"
#include "mirror/string-inl.h"
#include "mirror/string.h"
#include "native_util.h"
#include "nativehelper/scoped_primitive_array.h"
#include "nativehelper/jni_macros.h"
#include "scoped_fast_native_object_access-inl.h"
namespace art {
static void CharsetUtils_asciiBytesToChars(JNIEnv* env, jclass, jbyteArray javaBytes, jint offset,
jint length, jcharArray javaChars) {
ScopedByteArrayRO bytes(env, javaBytes);
if (bytes.get() == nullptr) {
return;
}
ScopedCharArrayRW chars(env, javaChars);
if (chars.get() == nullptr) {
return;
}
const jbyte* src = &bytes[offset];
jchar* dst = &chars[0];
static const jchar REPLACEMENT_CHAR = 0xfffd;
for (int i = length - 1; i >= 0; --i) {
jchar ch = static_cast<jchar>(*src++ & 0xff);
*dst++ = (ch <= 0x7f) ? ch : REPLACEMENT_CHAR;
}
}
/**
* Translates the given characters to US-ASCII or ISO-8859-1 bytes, using the fact that
* Unicode code points between U+0000 and U+007f inclusive are identical to US-ASCII, while
* U+0000 to U+00ff inclusive are identical to ISO-8859-1.
*/
static jbyteArray charsToBytes(JNIEnv* env, jstring java_string, jint offset, jint length,
jchar maxValidChar) {
ScopedFastNativeObjectAccess soa(env);
StackHandleScope<1> hs(soa.Self());
Handle<mirror::String> string(hs.NewHandle(soa.Decode<mirror::String>(java_string)));
if (string == nullptr) {
return nullptr;
}
ObjPtr<mirror::ByteArray> result = mirror::ByteArray::Alloc(soa.Self(), length);
if (result == nullptr) {
return nullptr;
}
if (string->IsCompressed()) {
// All characters in a compressed string are ASCII and therefore do not need a replacement.
DCHECK_GE(maxValidChar, 0x7f);
memcpy(result->GetData(), string->GetValueCompressed() + offset, length);
} else {
const uint16_t* src = string->GetValue() + offset;
auto clamp = [maxValidChar](uint16_t c) {
return static_cast<jbyte>(dchecked_integral_cast<uint8_t>((c > maxValidChar) ? '?' : c));
};
std::transform(src, src + length, result->GetData(), clamp);
}
return soa.AddLocalReference<jbyteArray>(result);
}
static jbyteArray CharsetUtils_toAsciiBytes(JNIEnv* env, jclass, jstring java_string, jint offset,
jint length) {
return charsToBytes(env, java_string, offset, length, 0x7f);
}
static jbyteArray CharsetUtils_toIsoLatin1Bytes(JNIEnv* env, jclass, jstring java_string,
jint offset, jint length) {
return charsToBytes(env, java_string, offset, length, 0xff);
}
static jbyteArray CharsetUtils_toUtf8Bytes(JNIEnv* env, jclass, jstring java_string, jint offset,
jint length) {
ScopedFastNativeObjectAccess soa(env);
StackHandleScope<1> hs(soa.Self());
Handle<mirror::String> string(hs.NewHandle(soa.Decode<mirror::String>(java_string)));
if (string == nullptr) {
return nullptr;
}
DCHECK_GE(offset, 0);
DCHECK_LE(offset, string->GetLength());
DCHECK_GE(length, 0);
DCHECK_LE(length, string->GetLength() - offset);
bool compressed = string->IsCompressed();
size_t utf8_length = 0;
if (compressed) {
utf8_length = length;
} else {
const uint16_t* utf16 = string->GetValue() + offset;
auto count_length = [&utf8_length](jbyte c ATTRIBUTE_UNUSED) ALWAYS_INLINE { ++utf8_length; };
ConvertUtf16ToUtf8</*kUseShortZero=*/ true,
/*kUse4ByteSequence=*/ true,
/*kReplaceBadSurrogates=*/ true>(utf16, length, count_length);
}
ObjPtr<mirror::ByteArray> result =
mirror::ByteArray::Alloc(soa.Self(), dchecked_integral_cast<int32_t>(utf8_length));
if (result == nullptr) {
return nullptr;
}
if (compressed) {
memcpy(result->GetData(), string->GetValueCompressed() + offset, length);
} else {
const uint16_t* utf16 = string->GetValue() + offset;
int8_t* data = result->GetData();
auto store_data = [&data](jbyte c) ALWAYS_INLINE { *data++ = c; };
ConvertUtf16ToUtf8</*kUseShortZero=*/ true,
/*kUse4ByteSequence=*/ true,
/*kReplaceBadSurrogates=*/ true>(utf16, length, store_data);
}
return soa.AddLocalReference<jbyteArray>(result);
}
static JNINativeMethod gMethods[] = {
FAST_NATIVE_METHOD(CharsetUtils, asciiBytesToChars, "([BII[C)V"),
FAST_NATIVE_METHOD(CharsetUtils, toAsciiBytes, "(Ljava/lang/String;II)[B"),
FAST_NATIVE_METHOD(CharsetUtils, toIsoLatin1Bytes, "(Ljava/lang/String;II)[B"),
FAST_NATIVE_METHOD(CharsetUtils, toUtf8Bytes, "(Ljava/lang/String;II)[B"),
};
void register_libcore_util_CharsetUtils(JNIEnv* env) {
REGISTER_NATIVE_METHODS("libcore/util/CharsetUtils");
}
} // namespace art
|
