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1 /* |
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2 * Copyright (c) 2014, 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 jdk.internal.net.http.hpack; |
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26 |
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27 import jdk.internal.net.http.hpack.HPACK.Logger; |
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28 import jdk.internal.vm.annotation.Stable; |
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29 |
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30 import java.io.IOException; |
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31 import java.nio.ByteBuffer; |
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32 import java.util.concurrent.atomic.AtomicLong; |
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33 |
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34 import static jdk.internal.net.http.hpack.HPACK.Logger.Level.EXTRA; |
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35 import static jdk.internal.net.http.hpack.HPACK.Logger.Level.NORMAL; |
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36 import static java.lang.String.format; |
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37 import static java.util.Objects.requireNonNull; |
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38 |
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39 /** |
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40 * Decodes headers from their binary representation. |
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41 * |
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42 * <p> Typical lifecycle looks like this: |
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43 * |
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44 * <p> {@link #Decoder(int) new Decoder} |
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45 * ({@link #setMaxCapacity(int) setMaxCapacity}? |
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46 * {@link #decode(ByteBuffer, boolean, DecodingCallback) decode})* |
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47 * |
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48 * @apiNote |
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49 * |
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50 * <p> The design intentions behind Decoder were to facilitate flexible and |
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51 * incremental style of processing. |
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52 * |
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53 * <p> {@code Decoder} does not require a complete header block in a single |
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54 * {@code ByteBuffer}. The header block can be spread across many buffers of any |
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55 * size and decoded one-by-one the way it makes most sense for the user. This |
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56 * way also allows not to limit the size of the header block. |
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57 * |
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58 * <p> Headers are delivered to the {@linkplain DecodingCallback callback} as |
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59 * soon as they become decoded. Using the callback also gives the user a freedom |
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60 * to decide how headers are processed. The callback does not limit the number |
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61 * of headers decoded during single decoding operation. |
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62 * |
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63 * @since 9 |
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64 */ |
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65 public final class Decoder { |
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66 |
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67 private final Logger logger; |
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68 private static final AtomicLong DECODERS_IDS = new AtomicLong(); |
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69 |
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70 @Stable |
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71 private static final State[] states = new State[256]; |
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72 |
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73 static { |
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74 // To be able to do a quick lookup, each of 256 possibilities are mapped |
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75 // to corresponding states. |
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76 // |
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77 // We can safely do this since patterns 1, 01, 001, 0001, 0000 are |
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78 // Huffman prefixes and therefore are inherently not ambiguous. |
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79 // |
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80 // I do it mainly for better debugging (to not go each time step by step |
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81 // through if...else tree). As for performance win for the decoding, I |
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82 // believe is negligible. |
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83 for (int i = 0; i < states.length; i++) { |
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84 if ((i & 0b1000_0000) == 0b1000_0000) { |
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85 states[i] = State.INDEXED; |
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86 } else if ((i & 0b1100_0000) == 0b0100_0000) { |
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87 states[i] = State.LITERAL_WITH_INDEXING; |
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88 } else if ((i & 0b1110_0000) == 0b0010_0000) { |
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89 states[i] = State.SIZE_UPDATE; |
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90 } else if ((i & 0b1111_0000) == 0b0001_0000) { |
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91 states[i] = State.LITERAL_NEVER_INDEXED; |
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92 } else if ((i & 0b1111_0000) == 0b0000_0000) { |
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93 states[i] = State.LITERAL; |
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94 } else { |
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95 throw new InternalError(String.valueOf(i)); |
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96 } |
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97 } |
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98 } |
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99 |
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100 private final long id; |
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101 private final HeaderTable table; |
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102 |
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103 private State state = State.READY; |
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104 private final IntegerReader integerReader; |
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105 private final StringReader stringReader; |
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106 private final StringBuilder name; |
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107 private final StringBuilder value; |
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108 private int intValue; |
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109 private boolean firstValueRead; |
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110 private boolean firstValueIndex; |
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111 private boolean nameHuffmanEncoded; |
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112 private boolean valueHuffmanEncoded; |
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113 private int capacity; |
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114 |
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115 /** |
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116 * Constructs a {@code Decoder} with the specified initial capacity of the |
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117 * header table. |
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118 * |
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119 * <p> The value has to be agreed between decoder and encoder out-of-band, |
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120 * e.g. by a protocol that uses HPACK |
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121 * (see <a href="https://tools.ietf.org/html/rfc7541#section-4.2">4.2. Maximum Table Size</a>). |
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122 * |
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123 * @param capacity |
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124 * a non-negative integer |
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125 * |
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126 * @throws IllegalArgumentException |
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127 * if capacity is negative |
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128 */ |
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129 public Decoder(int capacity) { |
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130 id = DECODERS_IDS.incrementAndGet(); |
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131 logger = HPACK.getLogger().subLogger("Decoder#" + id); |
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132 if (logger.isLoggable(NORMAL)) { |
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133 logger.log(NORMAL, () -> format("new decoder with maximum table size %s", |
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134 capacity)); |
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135 } |
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136 if (logger.isLoggable(NORMAL)) { |
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137 /* To correlate with logging outside HPACK, knowing |
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138 hashCode/toString is important */ |
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139 logger.log(NORMAL, () -> { |
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140 String hashCode = Integer.toHexString( |
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141 System.identityHashCode(this)); |
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142 return format("toString='%s', identityHashCode=%s", |
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143 toString(), hashCode); |
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144 }); |
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145 } |
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146 setMaxCapacity0(capacity); |
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147 table = new HeaderTable(capacity, logger.subLogger("HeaderTable")); |
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148 integerReader = new IntegerReader(); |
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149 stringReader = new StringReader(); |
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150 name = new StringBuilder(512); |
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151 value = new StringBuilder(1024); |
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152 } |
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153 |
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154 /** |
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155 * Sets a maximum capacity of the header table. |
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156 * |
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157 * <p> The value has to be agreed between decoder and encoder out-of-band, |
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158 * e.g. by a protocol that uses HPACK |
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159 * (see <a href="https://tools.ietf.org/html/rfc7541#section-4.2">4.2. Maximum Table Size</a>). |
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160 * |
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161 * @param capacity |
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162 * a non-negative integer |
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163 * |
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164 * @throws IllegalArgumentException |
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165 * if capacity is negative |
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166 */ |
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167 public void setMaxCapacity(int capacity) { |
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168 if (logger.isLoggable(NORMAL)) { |
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169 logger.log(NORMAL, () -> format("setting maximum table size to %s", |
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170 capacity)); |
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171 } |
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172 setMaxCapacity0(capacity); |
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173 } |
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174 |
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175 private void setMaxCapacity0(int capacity) { |
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176 if (capacity < 0) { |
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177 throw new IllegalArgumentException("capacity >= 0: " + capacity); |
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178 } |
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179 // FIXME: await capacity update if less than what was prior to it |
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180 this.capacity = capacity; |
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181 } |
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182 |
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183 /** |
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184 * Decodes a header block from the given buffer to the given callback. |
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185 * |
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186 * <p> Suppose a header block is represented by a sequence of |
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187 * {@code ByteBuffer}s in the form of {@code Iterator<ByteBuffer>}. And the |
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188 * consumer of decoded headers is represented by the callback. Then to |
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189 * decode the header block, the following approach might be used: |
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190 * |
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191 * <pre>{@code |
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192 * while (buffers.hasNext()) { |
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193 * ByteBuffer input = buffers.next(); |
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194 * decoder.decode(input, callback, !buffers.hasNext()); |
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195 * } |
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196 * }</pre> |
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197 * |
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198 * <p> The decoder reads as much as possible of the header block from the |
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199 * given buffer, starting at the buffer's position, and increments its |
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200 * position to reflect the bytes read. The buffer's mark and limit will not |
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201 * be modified. |
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202 * |
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203 * <p> Once the method is invoked with {@code endOfHeaderBlock == true}, the |
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204 * current header block is deemed ended, and inconsistencies, if any, are |
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205 * reported immediately by throwing an {@code IOException}. |
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206 * |
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207 * <p> Each callback method is called only after the implementation has |
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208 * processed the corresponding bytes. If the bytes revealed a decoding |
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209 * error, the callback method is not called. |
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210 * |
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211 * <p> In addition to exceptions thrown directly by the method, any |
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212 * exceptions thrown from the {@code callback} will bubble up. |
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213 * |
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214 * @apiNote The method asks for {@code endOfHeaderBlock} flag instead of |
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215 * returning it for two reasons. The first one is that the user of the |
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216 * decoder always knows which chunk is the last. The second one is to throw |
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217 * the most detailed exception possible, which might be useful for |
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218 * diagnosing issues. |
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219 * |
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220 * @implNote This implementation is not atomic in respect to decoding |
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221 * errors. In other words, if the decoding operation has thrown a decoding |
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222 * error, the decoder is no longer usable. |
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223 * |
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224 * @param headerBlock |
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225 * the chunk of the header block, may be empty |
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226 * @param endOfHeaderBlock |
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227 * true if the chunk is the final (or the only one) in the sequence |
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228 * |
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229 * @param consumer |
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230 * the callback |
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231 * @throws IOException |
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232 * in case of a decoding error |
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233 * @throws NullPointerException |
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234 * if either headerBlock or consumer are null |
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235 */ |
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236 public void decode(ByteBuffer headerBlock, |
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237 boolean endOfHeaderBlock, |
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238 DecodingCallback consumer) throws IOException { |
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239 requireNonNull(headerBlock, "headerBlock"); |
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240 requireNonNull(consumer, "consumer"); |
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241 if (logger.isLoggable(NORMAL)) { |
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242 logger.log(NORMAL, () -> format("reading %s, end of header block? %s", |
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243 headerBlock, endOfHeaderBlock)); |
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244 } |
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245 while (headerBlock.hasRemaining()) { |
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246 proceed(headerBlock, consumer); |
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247 } |
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248 if (endOfHeaderBlock && state != State.READY) { |
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249 logger.log(NORMAL, () -> format("unexpected end of %s representation", |
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250 state)); |
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251 throw new IOException("Unexpected end of header block"); |
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252 } |
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253 } |
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254 |
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255 private void proceed(ByteBuffer input, DecodingCallback action) |
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256 throws IOException { |
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257 switch (state) { |
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258 case READY: |
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259 resumeReady(input); |
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260 break; |
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261 case INDEXED: |
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262 resumeIndexed(input, action); |
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263 break; |
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264 case LITERAL: |
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265 resumeLiteral(input, action); |
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266 break; |
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267 case LITERAL_WITH_INDEXING: |
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268 resumeLiteralWithIndexing(input, action); |
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269 break; |
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270 case LITERAL_NEVER_INDEXED: |
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271 resumeLiteralNeverIndexed(input, action); |
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272 break; |
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273 case SIZE_UPDATE: |
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274 resumeSizeUpdate(input, action); |
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275 break; |
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276 default: |
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277 throw new InternalError("Unexpected decoder state: " + state); |
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278 } |
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279 } |
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280 |
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281 private void resumeReady(ByteBuffer input) { |
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282 int b = input.get(input.position()) & 0xff; // absolute read |
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283 State s = states[b]; |
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284 if (logger.isLoggable(EXTRA)) { |
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285 logger.log(EXTRA, () -> format("next binary representation %s (first byte 0x%02x)", |
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286 s, b)); |
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287 } |
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288 switch (s) { |
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289 case INDEXED: |
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290 integerReader.configure(7); |
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291 state = State.INDEXED; |
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292 firstValueIndex = true; |
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293 break; |
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294 case LITERAL: |
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295 state = State.LITERAL; |
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296 firstValueIndex = (b & 0b0000_1111) != 0; |
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297 if (firstValueIndex) { |
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298 integerReader.configure(4); |
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299 } |
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300 break; |
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301 case LITERAL_WITH_INDEXING: |
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302 state = State.LITERAL_WITH_INDEXING; |
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303 firstValueIndex = (b & 0b0011_1111) != 0; |
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304 if (firstValueIndex) { |
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305 integerReader.configure(6); |
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306 } |
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307 break; |
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308 case LITERAL_NEVER_INDEXED: |
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309 state = State.LITERAL_NEVER_INDEXED; |
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310 firstValueIndex = (b & 0b0000_1111) != 0; |
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311 if (firstValueIndex) { |
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312 integerReader.configure(4); |
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313 } |
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314 break; |
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315 case SIZE_UPDATE: |
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316 integerReader.configure(5); |
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317 state = State.SIZE_UPDATE; |
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318 firstValueIndex = true; |
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319 break; |
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320 default: |
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321 throw new InternalError(String.valueOf(s)); |
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322 } |
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323 if (!firstValueIndex) { |
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324 input.get(); // advance, next stop: "String Literal" |
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325 } |
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326 } |
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327 |
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328 // 0 1 2 3 4 5 6 7 |
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329 // +---+---+---+---+---+---+---+---+ |
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330 // | 1 | Index (7+) | |
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331 // +---+---------------------------+ |
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332 // |
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333 private void resumeIndexed(ByteBuffer input, DecodingCallback action) |
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334 throws IOException { |
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335 if (!integerReader.read(input)) { |
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336 return; |
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337 } |
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338 intValue = integerReader.get(); |
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339 integerReader.reset(); |
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340 if (logger.isLoggable(NORMAL)) { |
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341 logger.log(NORMAL, () -> format("indexed %s", intValue)); |
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342 } |
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343 try { |
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344 HeaderTable.HeaderField f = getHeaderFieldAt(intValue); |
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345 action.onIndexed(intValue, f.name, f.value); |
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346 } finally { |
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347 state = State.READY; |
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348 } |
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349 } |
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350 |
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351 private HeaderTable.HeaderField getHeaderFieldAt(int index) |
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352 throws IOException |
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353 { |
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354 HeaderTable.HeaderField f; |
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355 try { |
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356 f = table.get(index); |
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357 } catch (IndexOutOfBoundsException e) { |
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358 throw new IOException("header fields table index", e); |
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359 } |
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360 return f; |
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361 } |
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362 |
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363 // 0 1 2 3 4 5 6 7 |
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364 // +---+---+---+---+---+---+---+---+ |
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365 // | 0 | 0 | 0 | 0 | Index (4+) | |
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366 // +---+---+-----------------------+ |
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367 // | H | Value Length (7+) | |
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368 // +---+---------------------------+ |
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369 // | Value String (Length octets) | |
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370 // +-------------------------------+ |
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371 // |
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372 // 0 1 2 3 4 5 6 7 |
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373 // +---+---+---+---+---+---+---+---+ |
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374 // | 0 | 0 | 0 | 0 | 0 | |
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375 // +---+---+-----------------------+ |
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376 // | H | Name Length (7+) | |
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377 // +---+---------------------------+ |
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378 // | Name String (Length octets) | |
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379 // +---+---------------------------+ |
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380 // | H | Value Length (7+) | |
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381 // +---+---------------------------+ |
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382 // | Value String (Length octets) | |
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383 // +-------------------------------+ |
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384 // |
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385 private void resumeLiteral(ByteBuffer input, DecodingCallback action) |
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386 throws IOException { |
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387 if (!completeReading(input)) { |
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388 return; |
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389 } |
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390 try { |
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391 if (firstValueIndex) { |
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392 if (logger.isLoggable(NORMAL)) { |
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393 logger.log(NORMAL, () -> format("literal without indexing ('%s', '%s')", |
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394 intValue, value)); |
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395 } |
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396 HeaderTable.HeaderField f = getHeaderFieldAt(intValue); |
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397 action.onLiteral(intValue, f.name, value, valueHuffmanEncoded); |
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398 } else { |
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399 if (logger.isLoggable(NORMAL)) { |
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400 logger.log(NORMAL, () -> format("literal without indexing ('%s', '%s')", |
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401 name, value)); |
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402 } |
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403 action.onLiteral(name, nameHuffmanEncoded, value, valueHuffmanEncoded); |
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404 } |
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405 } finally { |
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406 cleanUpAfterReading(); |
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407 } |
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408 } |
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409 |
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410 // |
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411 // 0 1 2 3 4 5 6 7 |
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412 // +---+---+---+---+---+---+---+---+ |
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413 // | 0 | 1 | Index (6+) | |
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414 // +---+---+-----------------------+ |
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415 // | H | Value Length (7+) | |
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416 // +---+---------------------------+ |
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417 // | Value String (Length octets) | |
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418 // +-------------------------------+ |
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419 // |
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420 // 0 1 2 3 4 5 6 7 |
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421 // +---+---+---+---+---+---+---+---+ |
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422 // | 0 | 1 | 0 | |
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423 // +---+---+-----------------------+ |
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424 // | H | Name Length (7+) | |
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425 // +---+---------------------------+ |
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426 // | Name String (Length octets) | |
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427 // +---+---------------------------+ |
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428 // | H | Value Length (7+) | |
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429 // +---+---------------------------+ |
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430 // | Value String (Length octets) | |
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431 // +-------------------------------+ |
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432 // |
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433 private void resumeLiteralWithIndexing(ByteBuffer input, |
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434 DecodingCallback action) |
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435 throws IOException { |
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436 if (!completeReading(input)) { |
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437 return; |
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438 } |
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439 try { |
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440 // |
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441 // 1. (name, value) will be stored in the table as strings |
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442 // 2. Most likely the callback will also create strings from them |
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443 // ------------------------------------------------------------------------ |
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444 // Let's create those string beforehand (and only once!) to benefit everyone |
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445 // |
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446 String n; |
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447 String v = value.toString(); |
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448 if (firstValueIndex) { |
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449 if (logger.isLoggable(NORMAL)) { |
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450 logger.log(NORMAL, () -> format("literal with incremental indexing ('%s', '%s')", |
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451 intValue, value)); |
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452 } |
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453 HeaderTable.HeaderField f = getHeaderFieldAt(intValue); |
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454 n = f.name; |
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455 action.onLiteralWithIndexing(intValue, n, v, valueHuffmanEncoded); |
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456 } else { |
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457 n = name.toString(); |
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458 if (logger.isLoggable(NORMAL)) { |
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459 logger.log(NORMAL, () -> format("literal with incremental indexing ('%s', '%s')", |
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460 n, value)); |
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461 } |
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462 action.onLiteralWithIndexing(n, nameHuffmanEncoded, v, valueHuffmanEncoded); |
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463 } |
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464 table.put(n, v); |
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465 } finally { |
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466 cleanUpAfterReading(); |
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467 } |
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468 } |
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469 |
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470 // 0 1 2 3 4 5 6 7 |
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471 // +---+---+---+---+---+---+---+---+ |
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472 // | 0 | 0 | 0 | 1 | Index (4+) | |
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473 // +---+---+-----------------------+ |
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474 // | H | Value Length (7+) | |
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475 // +---+---------------------------+ |
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476 // | Value String (Length octets) | |
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477 // +-------------------------------+ |
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478 // |
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479 // 0 1 2 3 4 5 6 7 |
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480 // +---+---+---+---+---+---+---+---+ |
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481 // | 0 | 0 | 0 | 1 | 0 | |
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482 // +---+---+-----------------------+ |
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483 // | H | Name Length (7+) | |
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484 // +---+---------------------------+ |
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485 // | Name String (Length octets) | |
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486 // +---+---------------------------+ |
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487 // | H | Value Length (7+) | |
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488 // +---+---------------------------+ |
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489 // | Value String (Length octets) | |
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490 // +-------------------------------+ |
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491 // |
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492 private void resumeLiteralNeverIndexed(ByteBuffer input, |
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493 DecodingCallback action) |
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494 throws IOException { |
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495 if (!completeReading(input)) { |
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496 return; |
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497 } |
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498 try { |
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499 if (firstValueIndex) { |
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500 if (logger.isLoggable(NORMAL)) { |
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501 logger.log(NORMAL, () -> format("literal never indexed ('%s', '%s')", |
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502 intValue, value)); |
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503 } |
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504 HeaderTable.HeaderField f = getHeaderFieldAt(intValue); |
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505 action.onLiteralNeverIndexed(intValue, f.name, value, valueHuffmanEncoded); |
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506 } else { |
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507 if (logger.isLoggable(NORMAL)) { |
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508 logger.log(NORMAL, () -> format("literal never indexed ('%s', '%s')", |
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509 name, value)); |
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510 } |
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511 action.onLiteralNeverIndexed(name, nameHuffmanEncoded, value, valueHuffmanEncoded); |
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512 } |
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513 } finally { |
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514 cleanUpAfterReading(); |
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515 } |
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516 } |
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517 |
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518 // 0 1 2 3 4 5 6 7 |
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519 // +---+---+---+---+---+---+---+---+ |
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520 // | 0 | 0 | 1 | Max size (5+) | |
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521 // +---+---------------------------+ |
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522 // |
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523 private void resumeSizeUpdate(ByteBuffer input, |
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524 DecodingCallback action) throws IOException { |
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525 if (!integerReader.read(input)) { |
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526 return; |
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527 } |
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528 intValue = integerReader.get(); |
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529 if (logger.isLoggable(NORMAL)) { |
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530 logger.log(NORMAL, () -> format("dynamic table size update %s", |
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531 intValue)); |
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532 } |
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533 assert intValue >= 0; |
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534 if (intValue > capacity) { |
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535 throw new IOException( |
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536 format("Received capacity exceeds expected: capacity=%s, expected=%s", |
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537 intValue, capacity)); |
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538 } |
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539 integerReader.reset(); |
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540 try { |
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541 action.onSizeUpdate(intValue); |
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542 table.setMaxSize(intValue); |
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543 } finally { |
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544 state = State.READY; |
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545 } |
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546 } |
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547 |
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548 private boolean completeReading(ByteBuffer input) throws IOException { |
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549 if (!firstValueRead) { |
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550 if (firstValueIndex) { |
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551 if (!integerReader.read(input)) { |
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552 return false; |
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553 } |
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554 intValue = integerReader.get(); |
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555 integerReader.reset(); |
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556 } else { |
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557 if (!stringReader.read(input, name)) { |
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558 return false; |
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559 } |
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560 nameHuffmanEncoded = stringReader.isHuffmanEncoded(); |
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561 stringReader.reset(); |
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562 } |
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563 firstValueRead = true; |
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564 return false; |
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565 } else { |
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566 if (!stringReader.read(input, value)) { |
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567 return false; |
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568 } |
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569 } |
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570 valueHuffmanEncoded = stringReader.isHuffmanEncoded(); |
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571 stringReader.reset(); |
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572 return true; |
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573 } |
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574 |
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575 private void cleanUpAfterReading() { |
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576 name.setLength(0); |
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577 value.setLength(0); |
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578 firstValueRead = false; |
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579 state = State.READY; |
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580 } |
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581 |
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582 private enum State { |
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583 READY, |
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584 INDEXED, |
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585 LITERAL_NEVER_INDEXED, |
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586 LITERAL, |
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587 LITERAL_WITH_INDEXING, |
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588 SIZE_UPDATE |
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589 } |
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590 |
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591 HeaderTable getTable() { |
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592 return table; |
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593 } |
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594 } |