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/*
* 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 "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"
#include "unicode/utf16.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;
}
}
static void CharsetUtils_isoLatin1BytesToChars(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];
for (int i = length - 1; i >= 0; --i) {
*dst++ = static_cast<jchar>(*src++ & 0xff);
}
}
/**
* 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);
auto visit_chars16 = [string, offset, length](auto append) REQUIRES_SHARED(Locks::mutator_lock_) {
const uint16_t* chars16 = string->GetValue() + offset;
for (int i = 0; i < length; ++i) {
jint ch = chars16[i];
if (ch < 0x80) {
// One byte.
append(ch);
} else if (ch < 0x800) {
// Two bytes.
append((ch >> 6) | 0xc0);
append((ch & 0x3f) | 0x80);
} else if (U16_IS_SURROGATE(ch)) {
// A supplementary character.
jchar high = static_cast<jchar>(ch);
jchar low = (i + 1 != length) ? chars16[i + 1] : 0;
if (!U16_IS_SURROGATE_LEAD(high) || !U16_IS_SURROGATE_TRAIL(low)) {
append('?');
continue;
}
// Now we know we have a *valid* surrogate pair, we can consume the low surrogate.
++i;
ch = U16_GET_SUPPLEMENTARY(high, low);
// Four bytes.
append((ch >> 18) | 0xf0);
append(((ch >> 12) & 0x3f) | 0x80);
append(((ch >> 6) & 0x3f) | 0x80);
append((ch & 0x3f) | 0x80);
} else {
// Three bytes.
append((ch >> 12) | 0xe0);
append(((ch >> 6) & 0x3f) | 0x80);
append((ch & 0x3f) | 0x80);
}
}
};
bool compressed = string->IsCompressed();
size_t utf8_length = 0;
if (compressed) {
utf8_length = length;
} else {
visit_chars16([&utf8_length](jbyte c ATTRIBUTE_UNUSED) { ++utf8_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 {
int8_t* data = result->GetData();
visit_chars16([&data](jbyte c) { *data++ = c; });
}
return soa.AddLocalReference<jbyteArray>(result);
}
static JNINativeMethod gMethods[] = {
FAST_NATIVE_METHOD(CharsetUtils, asciiBytesToChars, "([BII[C)V"),
FAST_NATIVE_METHOD(CharsetUtils, isoLatin1BytesToChars, "([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
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