/*
* Copyright 2013-2017 consulo.io
*
* 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.
*/
package org.jetbrains.io;
import io.netty.buffer.ByteBuf;
import io.netty.util.CharsetUtil;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.CharacterCodingException;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CoderResult;
/**
* @author VISTALL
* @since 06-May-17
* <p>
* from kotlin platform\platform-impl\src\org\jetbrains\io\bufferToChars.kt
*/
public class BufferToCharsKt {
public static void readIntoCharBuffer(ByteBuf byteBuf, CharBuffer charBuffer) {
readIntoCharBuffer(byteBuf, byteBuf.readableBytes(), charBuffer);
}
public static void readIntoCharBuffer(ByteBuf byteBuf, int byteCount, CharBuffer charBuffer) {
CharsetDecoder decoder = CharsetUtil.decoder(CharsetUtil.UTF_8);
if (byteBuf.nioBufferCount() == 1) {
decodeString(decoder, byteBuf.internalNioBuffer(byteBuf.readerIndex(), byteCount), charBuffer);
}
else {
ByteBuf buffer = byteBuf.alloc().heapBuffer(byteCount);
try {
buffer.writeBytes(byteBuf, byteBuf.readerIndex(), byteCount);
decodeString(decoder, buffer.internalNioBuffer(0, byteCount), charBuffer);
}
finally {
buffer.release();
}
}
}
private static void decodeString(CharsetDecoder decoder, ByteBuffer src, CharBuffer dst) {
try {
CoderResult cr = decoder.decode(src, dst, true);
if (!cr.isUnderflow()) {
cr.throwException();
}
cr = decoder.flush(dst);
if (!cr.isUnderflow()) {
cr.throwException();
}
}
catch (CharacterCodingException x) {
throw new IllegalStateException(x);
}
}
}