| /**************************************************************** |
| * Licensed to the Apache Software Foundation (ASF) under one * |
| * or more contributor license agreements. See the NOTICE file * |
| * distributed with this work for additional information * |
| * regarding copyright ownership. The ASF 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 org.apache.james.mime4j.stream; |
| |
| import java.util.BitSet; |
| |
| import org.apache.james.mime4j.MimeException; |
| import org.apache.james.mime4j.io.MaxHeaderLengthLimitException; |
| import org.apache.james.mime4j.util.ByteArrayBuffer; |
| |
| /** |
| * Default implementation of {@link FieldBuilder}. |
| * |
| */ |
| public class DefaultFieldBuilder implements FieldBuilder { |
| |
| private static final BitSet FIELD_CHARS = new BitSet(); |
| |
| static { |
| for (int i = 0x21; i <= 0x39; i++) { |
| FIELD_CHARS.set(i); |
| } |
| for (int i = 0x3b; i <= 0x7e; i++) { |
| FIELD_CHARS.set(i); |
| } |
| } |
| |
| private final ByteArrayBuffer buf; |
| private final int maxlen; |
| |
| public DefaultFieldBuilder(int maxlen) { |
| this.buf = new ByteArrayBuffer(1024); |
| this.maxlen = maxlen; |
| } |
| |
| public void reset() { |
| this.buf.clear(); |
| } |
| |
| public void append(final ByteArrayBuffer line) throws MaxHeaderLengthLimitException { |
| if (line == null) { |
| return; |
| } |
| int len = line.length(); |
| if (this.maxlen > 0 && this.buf.length() + len >= this.maxlen) { |
| throw new MaxHeaderLengthLimitException("Maximum header length limit (" + this.maxlen + ") exceeded"); |
| } |
| this.buf.append(line.buffer(), 0, line.length()); |
| } |
| |
| public RawField build() throws MimeException { |
| int len = this.buf.length(); |
| if (len > 0) { |
| if (this.buf.byteAt(len - 1) == '\n') { |
| len --; |
| } |
| if (this.buf.byteAt(len - 1) == '\r') { |
| len --; |
| } |
| } |
| ByteArrayBuffer copy = new ByteArrayBuffer(this.buf.buffer(), len, false); |
| RawField field = RawFieldParser.DEFAULT.parseField(copy); |
| String name = field.getName(); |
| for (int i = 0; i < name.length(); i++) { |
| char ch = name.charAt(i); |
| if (!FIELD_CHARS.get(ch)) { |
| throw new MimeException("MIME field name contains illegal characters: " |
| + field.getName()); |
| } |
| } |
| return field; |
| } |
| |
| public ByteArrayBuffer getRaw() { |
| return this.buf; |
| } |
| |
| } |