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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/numerics/safe_conversions.h"
- #include "base/strings/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(reinterpret_cast<const jchar*>(str.data()),
- base::checked_cast<jsize>(str.length()));
- base::android::CheckException(env);
- return result;
- }
- } // namespace
- namespace base {
- namespace android {
- void ConvertJavaStringToUTF8(JNIEnv* env, jstring str, std::string* result) {
- DCHECK(str);
- if (!str) {
- LOG(WARNING) << "ConvertJavaStringToUTF8 called with null string.";
- result->clear();
- return;
- }
- const jsize length = env->GetStringLength(str);
- if (length <= 0) {
- result->clear();
- CheckException(env);
- 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(reinterpret_cast<const char16_t*>(chars),
- static_cast<size_t>(length), 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());
- }
- std::string ConvertJavaStringToUTF8(JNIEnv* env, const JavaRef<jstring>& str) {
- return ConvertJavaStringToUTF8(env, str.obj());
- }
- ScopedJavaLocalRef<jstring> ConvertUTF8ToJavaString(JNIEnv* env,
- const 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,
- std::u16string* result) {
- DCHECK(str);
- if (!str) {
- LOG(WARNING) << "ConvertJavaStringToUTF16 called with null string.";
- result->clear();
- return;
- }
- const jsize length = env->GetStringLength(str);
- if (length <= 0) {
- result->clear();
- CheckException(env);
- 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(reinterpret_cast<const char16_t*>(chars),
- static_cast<size_t>(length));
- env->ReleaseStringChars(str, chars);
- CheckException(env);
- }
- std::u16string ConvertJavaStringToUTF16(JNIEnv* env, jstring str) {
- std::u16string result;
- ConvertJavaStringToUTF16(env, str, &result);
- return result;
- }
- std::u16string ConvertJavaStringToUTF16(const JavaRef<jstring>& str) {
- return ConvertJavaStringToUTF16(AttachCurrentThread(), str.obj());
- }
- std::u16string ConvertJavaStringToUTF16(JNIEnv* env,
- const JavaRef<jstring>& str) {
- return ConvertJavaStringToUTF16(env, str.obj());
- }
- ScopedJavaLocalRef<jstring> ConvertUTF16ToJavaString(JNIEnv* env,
- const StringPiece16& str) {
- return ScopedJavaLocalRef<jstring>(env,
- ConvertUTF16ToJavaStringImpl(env, str));
- }
- } // namespace android
- } // namespace base
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