blob: 572afa0e86f9e059c814cc443e8ffa2515954847 [file] [log] [blame]
// Copyright 2019 The Bazel Authors. All rights reserved.
//
// 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 "src/main/native/latin1_jni_path.h"
#include <string.h>
namespace blaze_jni {
jstring NewStringLatin1(JNIEnv *env, const char *str) {
int len = strlen(str);
jchar buf[512];
jchar *str1;
if (len > 512) {
str1 = new jchar[len];
} else {
str1 = buf;
}
for (int i = 0; i < len; i++) {
str1[i] = (unsigned char)str[i];
}
jstring result = env->NewString(str1, len);
if (str1 != buf) {
delete[] str1;
}
return result;
}
static jfieldID String_coder_field;
static jfieldID String_value_field;
static bool CompactStringsEnabled(JNIEnv *env) {
if (jclass klass = env->FindClass("java/lang/String")) {
if (jfieldID csf = env->GetStaticFieldID(klass, "COMPACT_STRINGS", "Z")) {
if (env->GetStaticBooleanField(klass, csf)) {
if ((String_coder_field = env->GetFieldID(klass, "coder", "B"))) {
if ((String_value_field = env->GetFieldID(klass, "value", "[B"))) {
return true;
}
}
}
}
}
env->ExceptionClear();
return false;
}
char *GetStringLatin1Chars(JNIEnv *env, jstring jstr) {
jint len = env->GetStringLength(jstr);
// Fast path for latin1 strings.
static bool cs_enabled = CompactStringsEnabled(env);
const int LATIN1 = 0;
if (cs_enabled && env->GetByteField(jstr, String_coder_field) == LATIN1) {
char *result = new char[len + 1];
if (jobject jvalue = env->GetObjectField(jstr, String_value_field)) {
env->GetByteArrayRegion((jbyteArray)jvalue, 0, len, (jbyte *)result);
}
result[len] = 0;
return result;
}
const jchar *str = env->GetStringCritical(jstr, NULL);
if (str == NULL) {
return NULL;
}
char *result = new char[len + 1];
for (int i = 0; i < len; i++) {
jchar unicode = str[i]; // (unsigned)
result[i] = unicode <= 0x00ff ? unicode : '?';
}
result[len] = 0;
env->ReleaseStringCritical(jstr, str);
return result;
}
/**
* Release the Latin1 chars returned by a prior call to
* GetStringLatin1Chars.
*/
void ReleaseStringLatin1Chars(const char *s) { delete[] s; }
} // namespace blaze_jni