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// 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/android/jni_string.h"
#include "base/android/jni_android.h"
#include "base/logging.h"
#include "base/utf_string_conversions.h"
namespace {
// Internal version that does not use a scoped local pointer.
jstring ConvertUTF16ToJavaStringImpl(JNIEnv* env,
const base::StringPiece16& str) {
jstring result = env->NewString(str.data(), str.length());
base::android::CheckException(env);
return result;
}
}
namespace base {
namespace android {
void ConvertJavaStringToUTF8(JNIEnv* env, jstring str, std::string* result) {
if (!str) {
LOG(WARNING) << "ConvertJavaStringToUTF8 called with null string.";
result->clear();
return;
}
// JNI's GetStringUTFChars() returns strings in Java "modified" UTF8, so
// instead get the String in UTF16 and convert using chromium's conversion
// function that yields plain (non Java-modified) UTF8.
const jchar* chars = env->GetStringChars(str, NULL);
DCHECK(chars);
UTF16ToUTF8(chars, env->GetStringLength(str), result);
env->ReleaseStringChars(str, chars);
CheckException(env);
}
std::string ConvertJavaStringToUTF8(JNIEnv* env, jstring str) {
std::string result;
ConvertJavaStringToUTF8(env, str, &result);
return result;
}
std::string ConvertJavaStringToUTF8(const JavaRef<jstring>& str) {
return ConvertJavaStringToUTF8(AttachCurrentThread(), str.obj());
}
ScopedJavaLocalRef<jstring> ConvertUTF8ToJavaString(
JNIEnv* env,
const base::StringPiece& str) {
// JNI's NewStringUTF expects "modified" UTF8 so instead create the string
// via our own UTF16 conversion utility.
// Further, Dalvik requires the string passed into NewStringUTF() to come from
// a trusted source. We can't guarantee that all UTF8 will be sanitized before
// it gets here, so constructing via UTF16 side-steps this issue.
// (Dalvik stores strings internally as UTF16 anyway, so there shouldn't be
// a significant performance hit by doing it this way).
return ScopedJavaLocalRef<jstring>(env, ConvertUTF16ToJavaStringImpl(
env, UTF8ToUTF16(str)));
}
void ConvertJavaStringToUTF16(JNIEnv* env, jstring str, string16* result) {
if (!str) {
LOG(WARNING) << "ConvertJavaStringToUTF16 called with null string.";
result->clear();
return;
}
const jchar* chars = env->GetStringChars(str, NULL);
DCHECK(chars);
// GetStringChars isn't required to NULL-terminate the strings
// it returns, so the length must be explicitly checked.
result->assign(chars, env->GetStringLength(str));
env->ReleaseStringChars(str, chars);
CheckException(env);
}
string16 ConvertJavaStringToUTF16(JNIEnv* env, jstring str) {
string16 result;
ConvertJavaStringToUTF16(env, str, &result);
return result;
}
string16 ConvertJavaStringToUTF16(const JavaRef<jstring>& str) {
return ConvertJavaStringToUTF16(AttachCurrentThread(), str.obj());
}
ScopedJavaLocalRef<jstring> ConvertUTF16ToJavaString(
JNIEnv* env,
const base::StringPiece16& str) {
return ScopedJavaLocalRef<jstring>(env,
ConvertUTF16ToJavaStringImpl(env, str));
}
} // namespace android
} // namespace base
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