1 | /**************************************************************** |
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2 | * Licensed to the Apache Software Foundation (ASF) under one * |
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3 | * or more contributor license agreements. See the NOTICE file * |
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4 | * distributed with this work for additional information * |
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5 | * regarding copyright ownership. The ASF licenses this file * |
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6 | * to you under the Apache License, Version 2.0 (the * |
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7 | * "License"); you may not use this file except in compliance * |
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8 | * with the License. You may obtain a copy of the License at * |
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9 | * * |
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10 | * http://www.apache.org/licenses/LICENSE-2.0 * |
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11 | * * |
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12 | * Unless required by applicable law or agreed to in writing, * |
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13 | * software distributed under the License is distributed on an * |
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14 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * |
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15 | * KIND, either express or implied. See the License for the * |
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16 | * specific language governing permissions and limitations * |
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17 | * under the License. * |
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18 | ****************************************************************/ |
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19 | |
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20 | package org.apache.james.mime4j.stream; |
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21 | |
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22 | import java.util.BitSet; |
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23 | |
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24 | import org.apache.james.mime4j.MimeException; |
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25 | import org.apache.james.mime4j.io.MaxHeaderLengthLimitException; |
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26 | import org.apache.james.mime4j.util.ByteArrayBuffer; |
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27 | |
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28 | public class DefaultFieldBuilder implements FieldBuilder { |
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29 | |
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30 | private static final BitSet FIELD_CHARS = new BitSet(); |
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31 | |
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32 | static { |
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33 | for (int i = 0x21; i <= 0x39; i++) { |
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34 | FIELD_CHARS.set(i); |
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35 | } |
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36 | for (int i = 0x3b; i <= 0x7e; i++) { |
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37 | FIELD_CHARS.set(i); |
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38 | } |
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39 | } |
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40 | |
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41 | private final ByteArrayBuffer buf; |
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42 | private final int maxlen; |
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43 | |
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44 | public DefaultFieldBuilder(int maxlen) { |
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45 | this.buf = new ByteArrayBuffer(1024); |
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46 | this.maxlen = maxlen; |
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47 | } |
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48 | |
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49 | public void reset() { |
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50 | this.buf.clear(); |
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51 | } |
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52 | |
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53 | public void append(final ByteArrayBuffer line) throws MaxHeaderLengthLimitException { |
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54 | if (line == null) { |
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55 | return; |
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56 | } |
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57 | int len = line.length(); |
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58 | if (this.maxlen > 0 && this.buf.length() + len >= this.maxlen) { |
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59 | throw new MaxHeaderLengthLimitException("Maximum header length limit exceeded"); |
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60 | } |
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61 | this.buf.append(line.buffer(), 0, line.length()); |
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62 | } |
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63 | |
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64 | public RawField build() throws MimeException { |
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65 | int len = this.buf.length(); |
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66 | if (len > 0) { |
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67 | if (this.buf.byteAt(len - 1) == '\n') { |
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68 | len --; |
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69 | } |
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70 | if (this.buf.byteAt(len - 1) == '\r') { |
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71 | len --; |
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72 | } |
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73 | } |
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74 | ByteArrayBuffer copy = new ByteArrayBuffer(this.buf.buffer(), len, false); |
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75 | RawField field = RawFieldParser.DEFAULT.parseField(copy); |
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76 | String name = field.getName(); |
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77 | for (int i = 0; i < name.length(); i++) { |
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78 | char ch = name.charAt(i); |
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79 | if (!FIELD_CHARS.get(ch)) { |
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80 | throw new MimeException("MIME field name contains illegal characters: " |
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81 | + field.getName()); |
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82 | } |
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83 | } |
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84 | return field; |
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85 | } |
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86 | |
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87 | public ByteArrayBuffer getRaw() { |
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88 | return this.buf; |
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89 | } |
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90 | |
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91 | } |
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