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1 /* |
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2 * Copyright (c) 2015, 2018, 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 java.net.http.internal.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 // StringWriter does not require a notion of endOfInput (isLast) in 'write' |
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39 // methods due to the nature of string representation in HPACK. Namely, the |
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40 // length of the string is put before string's contents. Therefore the length is |
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41 // always known beforehand. |
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42 // |
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43 // Expected use: |
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44 // |
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45 // configure write* (reset configure write*)* |
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46 // |
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47 final class StringWriter { |
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48 |
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49 private static final int NEW = 0; |
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50 private static final int CONFIGURED = 1; |
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51 private static final int LENGTH_WRITTEN = 2; |
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52 private static final int DONE = 4; |
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53 |
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54 private final IntegerWriter intWriter = new IntegerWriter(); |
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55 private final Huffman.Writer huffmanWriter = new Huffman.Writer(); |
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56 private final ISO_8859_1.Writer plainWriter = new ISO_8859_1.Writer(); |
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57 |
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58 private int state = NEW; |
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59 private boolean huffman; |
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60 |
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61 StringWriter configure(CharSequence input, boolean huffman) { |
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62 return configure(input, 0, input.length(), huffman); |
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63 } |
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64 |
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65 StringWriter configure(CharSequence input, |
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66 int start, |
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67 int end, |
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68 boolean huffman) { |
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69 if (start < 0 || end < 0 || end > input.length() || start > end) { |
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70 throw new IndexOutOfBoundsException( |
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71 String.format("input.length()=%s, start=%s, end=%s", |
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72 input.length(), start, end)); |
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73 } |
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74 if (!huffman) { |
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75 plainWriter.configure(input, start, end); |
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76 intWriter.configure(end - start, 7, 0b0000_0000); |
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77 } else { |
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78 huffmanWriter.from(input, start, end); |
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79 intWriter.configure(Huffman.INSTANCE.lengthOf(input, start, end), |
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80 7, 0b1000_0000); |
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81 } |
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82 |
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83 this.huffman = huffman; |
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84 state = CONFIGURED; |
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85 return this; |
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86 } |
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87 |
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88 boolean write(ByteBuffer output) { |
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89 if (state == DONE) { |
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90 return true; |
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91 } |
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92 if (state == NEW) { |
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93 throw new IllegalStateException("Configure first"); |
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94 } |
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95 if (!output.hasRemaining()) { |
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96 return false; |
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97 } |
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98 if (state == CONFIGURED) { |
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99 if (intWriter.write(output)) { |
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100 state = LENGTH_WRITTEN; |
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101 } else { |
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102 return false; |
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103 } |
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104 } |
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105 if (state == LENGTH_WRITTEN) { |
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106 boolean written = huffman |
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107 ? huffmanWriter.write(output) |
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108 : plainWriter.write(output); |
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109 if (written) { |
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110 state = DONE; |
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111 return true; |
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112 } else { |
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113 return false; |
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114 } |
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115 } |
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116 throw new InternalError(Arrays.toString(new Object[]{state, huffman})); |
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117 } |
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118 |
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119 void reset() { |
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120 intWriter.reset(); |
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121 if (huffman) { |
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122 huffmanWriter.reset(); |
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123 } else { |
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124 plainWriter.reset(); |
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125 } |
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126 state = NEW; |
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127 } |
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128 } |