/*
* Copyright 2014 The Netty Project
*
* The Netty Project licenses this file to you 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 io.netty.handler.codec.http;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufUtil;
import io.netty.util.AsciiString;
import static io.netty.util.AsciiString.c2b;
final class HttpHeadersEncoder {
private HttpHeadersEncoder() {
}
public static void encoderHeader(CharSequence name, CharSequence value, ByteBuf buf) throws Exception {
final int nameLen = name.length();
final int valueLen = value.length();
final int entryLen = nameLen + valueLen + 4;
buf.ensureWritable(entryLen);
int offset = buf.writerIndex();
writeAscii(buf, offset, name, nameLen);
offset += nameLen;
buf.setByte(offset ++, ':');
buf.setByte(offset ++, ' ');
writeAscii(buf, offset, value, valueLen);
offset += valueLen;
buf.setByte(offset ++, '\r');
buf.setByte(offset ++, '\n');
buf.writerIndex(offset);
}
private static void writeAscii(ByteBuf buf, int offset, CharSequence value, int valueLen) {
if (value instanceof AsciiString) {
ByteBufUtil.copy((AsciiString) value, 0, buf, offset, valueLen);
} else {
writeCharSequence(buf, offset, value, valueLen);
}
}
private static void writeCharSequence(ByteBuf buf, int offset, CharSequence value, int valueLen) {
for (int i = 0; i < valueLen; ++i) {
buf.setByte(offset ++, c2b(value.charAt(i)));
}
}
}