1 /* |
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2 * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 package sun.net.httpclient.hpack; |
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26 |
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27 import java.nio.ByteBuffer; |
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28 import java.util.Arrays; |
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29 |
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30 // |
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31 // 0 1 2 3 4 5 6 7 |
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32 // +---+---+---+---+---+---+---+---+ |
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33 // | H | String Length (7+) | |
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34 // +---+---------------------------+ |
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35 // | String Data (Length octets) | |
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36 // +-------------------------------+ |
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37 // |
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38 final class StringReader { |
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39 |
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40 private static final int NEW = 0; |
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41 private static final int FIRST_BYTE_READ = 1; |
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42 private static final int LENGTH_READ = 2; |
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43 private static final int DONE = 4; |
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44 |
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45 private final IntegerReader intReader = new IntegerReader(); |
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46 private final Huffman.Reader huffmanReader = new Huffman.Reader(); |
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47 private final ISO_8859_1.Reader plainReader = new ISO_8859_1.Reader(); |
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48 |
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49 private int state = NEW; |
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50 |
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51 private boolean huffman; |
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52 private int remainingLength; |
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53 |
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54 boolean read(ByteBuffer input, Appendable output) { |
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55 if (state == DONE) { |
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56 return true; |
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57 } |
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58 if (!input.hasRemaining()) { |
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59 return false; |
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60 } |
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61 if (state == NEW) { |
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62 int p = input.position(); |
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63 huffman = (input.get(p) & 0b10000000) != 0; |
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64 state = FIRST_BYTE_READ; |
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65 intReader.configure(7); |
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66 } |
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67 if (state == FIRST_BYTE_READ) { |
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68 boolean lengthRead = intReader.read(input); |
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69 if (!lengthRead) { |
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70 return false; |
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71 } |
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72 remainingLength = intReader.get(); |
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73 state = LENGTH_READ; |
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74 } |
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75 if (state == LENGTH_READ) { |
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76 boolean isLast = input.remaining() >= remainingLength; |
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77 int oldLimit = input.limit(); |
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78 if (isLast) { |
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79 input.limit(input.position() + remainingLength); |
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80 } |
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81 remainingLength -= Math.min(input.remaining(), remainingLength); |
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82 if (huffman) { |
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83 huffmanReader.read(input, output, isLast); |
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84 } else { |
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85 plainReader.read(input, output); |
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86 } |
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87 if (isLast) { |
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88 input.limit(oldLimit); |
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89 state = DONE; |
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90 } |
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91 return isLast; |
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92 } |
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93 throw new InternalError(Arrays.toString( |
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94 new Object[]{state, huffman, remainingLength})); |
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95 } |
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96 |
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97 boolean isHuffmanEncoded() { |
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98 if (state < FIRST_BYTE_READ) { |
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99 throw new IllegalStateException("Has not been fully read yet"); |
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100 } |
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101 return huffman; |
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102 } |
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103 |
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104 void reset() { |
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105 if (huffman) { |
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106 huffmanReader.reset(); |
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107 } else { |
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108 plainReader.reset(); |
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109 } |
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110 intReader.reset(); |
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111 state = NEW; |
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112 } |
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113 } |
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