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1   /*
2    * Copyright 2014 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  
17  package io.netty.handler.codec.http;
18  
19  import io.netty.buffer.ByteBuf;
20  import io.netty.buffer.ByteBufUtil;
21  import io.netty.util.AsciiString;
22  import io.netty.util.CharsetUtil;
23  
24  import static io.netty.handler.codec.http.HttpConstants.*;
25  import static io.netty.handler.codec.http.HttpObjectEncoder.CRLF_SHORT;
26  
27  final class HttpHeadersEncoder {
28      private static final int COLON_AND_SPACE_SHORT = (COLON << 8) | SP;
29  
30      private HttpHeadersEncoder() {
31      }
32  
33      static void encoderHeader(CharSequence name, CharSequence value, ByteBuf buf) {
34          final int nameLen = name.length();
35          final int valueLen = value.length();
36          final int entryLen = nameLen + valueLen + 4;
37          buf.ensureWritable(entryLen);
38          int offset = buf.writerIndex();
39          writeAscii(buf, offset, name);
40          offset += nameLen;
41          ByteBufUtil.setShortBE(buf, offset, COLON_AND_SPACE_SHORT);
42          offset += 2;
43          writeAscii(buf, offset, value);
44          offset += valueLen;
45          ByteBufUtil.setShortBE(buf, offset, CRLF_SHORT);
46          offset += 2;
47          buf.writerIndex(offset);
48      }
49  
50      private static void writeAscii(ByteBuf buf, int offset, CharSequence value) {
51          if (value instanceof AsciiString) {
52              ByteBufUtil.copy((AsciiString) value, 0, buf, offset, value.length());
53          } else {
54              buf.setCharSequence(offset, value, CharsetUtil.US_ASCII);
55          }
56      }
57  }