1 | // Protocol Buffers - Google's data interchange format |
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2 | // Copyright 2008 Google Inc. All rights reserved. |
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3 | // http://code.google.com/p/protobuf/ |
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4 | // |
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5 | // Redistribution and use in source and binary forms, with or without |
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6 | // modification, are permitted provided that the following conditions are |
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7 | // met: |
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8 | // |
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9 | // * Redistributions of source code must retain the above copyright |
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10 | // notice, this list of conditions and the following disclaimer. |
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11 | // * Redistributions in binary form must reproduce the above |
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12 | // copyright notice, this list of conditions and the following disclaimer |
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13 | // in the documentation and/or other materials provided with the |
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14 | // distribution. |
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15 | // * Neither the name of Google Inc. nor the names of its |
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16 | // contributors may be used to endorse or promote products derived from |
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17 | // this software without specific prior written permission. |
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18 | // |
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19 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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20 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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21 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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22 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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23 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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24 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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25 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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26 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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27 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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28 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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29 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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30 | |
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31 | package com.google.protobuf; |
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32 | |
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33 | import java.io.OutputStream; |
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34 | import java.io.IOException; |
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35 | import java.io.UnsupportedEncodingException; |
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36 | import java.io.InputStream; |
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37 | |
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38 | /** |
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39 | * Encodes and writes protocol message fields. |
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40 | * |
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41 | * <p>This class contains two kinds of methods: methods that write specific |
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42 | * protocol message constructs and field types (e.g. {@link #writeTag} and |
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43 | * {@link #writeInt32}) and methods that write low-level values (e.g. |
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44 | * {@link #writeRawVarint32} and {@link #writeRawBytes}). If you are |
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45 | * writing encoded protocol messages, you should use the former methods, but if |
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46 | * you are writing some other format of your own design, use the latter. |
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47 | * |
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48 | * <p>This class is totally unsynchronized. |
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49 | * |
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50 | * @author kneton@google.com Kenton Varda |
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51 | */ |
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52 | public final class CodedOutputStream { |
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53 | private final byte[] buffer; |
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54 | private final int limit; |
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55 | private int position; |
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56 | |
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57 | private final OutputStream output; |
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58 | |
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59 | /** |
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60 | * The buffer size used in {@link #newInstance(OutputStream)}. |
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61 | */ |
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62 | public static final int DEFAULT_BUFFER_SIZE = 4096; |
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63 | |
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64 | /** |
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65 | * Returns the buffer size to efficiently write dataLength bytes to this |
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66 | * CodedOutputStream. Used by AbstractMessageLite. |
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67 | * |
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68 | * @return the buffer size to efficiently write dataLength bytes to this |
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69 | * CodedOutputStream. |
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70 | */ |
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71 | static int computePreferredBufferSize(int dataLength) { |
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72 | if (dataLength > DEFAULT_BUFFER_SIZE) return DEFAULT_BUFFER_SIZE; |
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73 | return dataLength; |
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74 | } |
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75 | |
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76 | private CodedOutputStream(final byte[] buffer, final int offset, |
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77 | final int length) { |
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78 | output = null; |
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79 | this.buffer = buffer; |
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80 | position = offset; |
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81 | limit = offset + length; |
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82 | } |
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83 | |
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84 | private CodedOutputStream(final OutputStream output, final byte[] buffer) { |
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85 | this.output = output; |
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86 | this.buffer = buffer; |
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87 | position = 0; |
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88 | limit = buffer.length; |
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89 | } |
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90 | |
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91 | /** |
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92 | * Create a new {@code CodedOutputStream} wrapping the given |
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93 | * {@code OutputStream}. |
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94 | */ |
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95 | public static CodedOutputStream newInstance(final OutputStream output) { |
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96 | return newInstance(output, DEFAULT_BUFFER_SIZE); |
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97 | } |
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98 | |
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99 | /** |
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100 | * Create a new {@code CodedOutputStream} wrapping the given |
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101 | * {@code OutputStream} with a given buffer size. |
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102 | */ |
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103 | public static CodedOutputStream newInstance(final OutputStream output, |
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104 | final int bufferSize) { |
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105 | return new CodedOutputStream(output, new byte[bufferSize]); |
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106 | } |
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107 | |
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108 | /** |
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109 | * Create a new {@code CodedOutputStream} that writes directly to the given |
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110 | * byte array. If more bytes are written than fit in the array, |
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111 | * {@link OutOfSpaceException} will be thrown. Writing directly to a flat |
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112 | * array is faster than writing to an {@code OutputStream}. See also |
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113 | * {@link ByteString#newCodedBuilder}. |
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114 | */ |
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115 | public static CodedOutputStream newInstance(final byte[] flatArray) { |
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116 | return newInstance(flatArray, 0, flatArray.length); |
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117 | } |
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118 | |
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119 | /** |
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120 | * Create a new {@code CodedOutputStream} that writes directly to the given |
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121 | * byte array slice. If more bytes are written than fit in the slice, |
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122 | * {@link OutOfSpaceException} will be thrown. Writing directly to a flat |
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123 | * array is faster than writing to an {@code OutputStream}. See also |
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124 | * {@link ByteString#newCodedBuilder}. |
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125 | */ |
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126 | public static CodedOutputStream newInstance(final byte[] flatArray, |
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127 | final int offset, |
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128 | final int length) { |
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129 | return new CodedOutputStream(flatArray, offset, length); |
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130 | } |
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131 | |
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132 | // ----------------------------------------------------------------- |
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133 | |
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134 | /** Write a {@code double} field, including tag, to the stream. */ |
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135 | public void writeDouble(final int fieldNumber, final double value) |
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136 | throws IOException { |
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137 | writeTag(fieldNumber, WireFormat.WIRETYPE_FIXED64); |
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138 | writeDoubleNoTag(value); |
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139 | } |
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140 | |
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141 | /** Write a {@code float} field, including tag, to the stream. */ |
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142 | public void writeFloat(final int fieldNumber, final float value) |
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143 | throws IOException { |
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144 | writeTag(fieldNumber, WireFormat.WIRETYPE_FIXED32); |
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145 | writeFloatNoTag(value); |
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146 | } |
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147 | |
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148 | /** Write a {@code uint64} field, including tag, to the stream. */ |
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149 | public void writeUInt64(final int fieldNumber, final long value) |
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150 | throws IOException { |
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151 | writeTag(fieldNumber, WireFormat.WIRETYPE_VARINT); |
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152 | writeUInt64NoTag(value); |
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153 | } |
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154 | |
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155 | /** Write an {@code int64} field, including tag, to the stream. */ |
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156 | public void writeInt64(final int fieldNumber, final long value) |
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157 | throws IOException { |
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158 | writeTag(fieldNumber, WireFormat.WIRETYPE_VARINT); |
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159 | writeInt64NoTag(value); |
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160 | } |
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161 | |
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162 | /** Write an {@code int32} field, including tag, to the stream. */ |
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163 | public void writeInt32(final int fieldNumber, final int value) |
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164 | throws IOException { |
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165 | writeTag(fieldNumber, WireFormat.WIRETYPE_VARINT); |
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166 | writeInt32NoTag(value); |
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167 | } |
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168 | |
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169 | /** Write a {@code fixed64} field, including tag, to the stream. */ |
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170 | public void writeFixed64(final int fieldNumber, final long value) |
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171 | throws IOException { |
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172 | writeTag(fieldNumber, WireFormat.WIRETYPE_FIXED64); |
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173 | writeFixed64NoTag(value); |
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174 | } |
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175 | |
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176 | /** Write a {@code fixed32} field, including tag, to the stream. */ |
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177 | public void writeFixed32(final int fieldNumber, final int value) |
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178 | throws IOException { |
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179 | writeTag(fieldNumber, WireFormat.WIRETYPE_FIXED32); |
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180 | writeFixed32NoTag(value); |
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181 | } |
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182 | |
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183 | /** Write a {@code bool} field, including tag, to the stream. */ |
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184 | public void writeBool(final int fieldNumber, final boolean value) |
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185 | throws IOException { |
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186 | writeTag(fieldNumber, WireFormat.WIRETYPE_VARINT); |
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187 | writeBoolNoTag(value); |
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188 | } |
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189 | |
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190 | /** Write a {@code string} field, including tag, to the stream. */ |
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191 | public void writeString(final int fieldNumber, final String value) |
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192 | throws IOException { |
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193 | writeTag(fieldNumber, WireFormat.WIRETYPE_LENGTH_DELIMITED); |
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194 | writeStringNoTag(value); |
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195 | } |
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196 | |
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197 | /** Write a {@code group} field, including tag, to the stream. */ |
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198 | public void writeGroup(final int fieldNumber, final MessageLite value) |
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199 | throws IOException { |
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200 | writeTag(fieldNumber, WireFormat.WIRETYPE_START_GROUP); |
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201 | writeGroupNoTag(value); |
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202 | writeTag(fieldNumber, WireFormat.WIRETYPE_END_GROUP); |
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203 | } |
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204 | |
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205 | /** |
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206 | * Write a group represented by an {@link UnknownFieldSet}. |
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207 | * |
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208 | * @deprecated UnknownFieldSet now implements MessageLite, so you can just |
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209 | * call {@link #writeGroup}. |
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210 | */ |
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211 | @Deprecated |
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212 | public void writeUnknownGroup(final int fieldNumber, |
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213 | final MessageLite value) |
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214 | throws IOException { |
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215 | writeGroup(fieldNumber, value); |
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216 | } |
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217 | |
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218 | /** Write an embedded message field, including tag, to the stream. */ |
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219 | public void writeMessage(final int fieldNumber, final MessageLite value) |
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220 | throws IOException { |
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221 | writeTag(fieldNumber, WireFormat.WIRETYPE_LENGTH_DELIMITED); |
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222 | writeMessageNoTag(value); |
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223 | } |
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224 | |
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225 | /** Write a {@code bytes} field, including tag, to the stream. */ |
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226 | public void writeBytes(final int fieldNumber, final ByteString value) |
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227 | throws IOException { |
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228 | writeTag(fieldNumber, WireFormat.WIRETYPE_LENGTH_DELIMITED); |
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229 | writeBytesNoTag(value); |
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230 | } |
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231 | |
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232 | /** Write a {@code uint32} field, including tag, to the stream. */ |
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233 | public void writeUInt32(final int fieldNumber, final int value) |
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234 | throws IOException { |
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235 | writeTag(fieldNumber, WireFormat.WIRETYPE_VARINT); |
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236 | writeUInt32NoTag(value); |
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237 | } |
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238 | |
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239 | /** |
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240 | * Write an enum field, including tag, to the stream. Caller is responsible |
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241 | * for converting the enum value to its numeric value. |
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242 | */ |
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243 | public void writeEnum(final int fieldNumber, final int value) |
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244 | throws IOException { |
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245 | writeTag(fieldNumber, WireFormat.WIRETYPE_VARINT); |
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246 | writeEnumNoTag(value); |
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247 | } |
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248 | |
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249 | /** Write an {@code sfixed32} field, including tag, to the stream. */ |
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250 | public void writeSFixed32(final int fieldNumber, final int value) |
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251 | throws IOException { |
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252 | writeTag(fieldNumber, WireFormat.WIRETYPE_FIXED32); |
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253 | writeSFixed32NoTag(value); |
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254 | } |
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255 | |
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256 | /** Write an {@code sfixed64} field, including tag, to the stream. */ |
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257 | public void writeSFixed64(final int fieldNumber, final long value) |
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258 | throws IOException { |
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259 | writeTag(fieldNumber, WireFormat.WIRETYPE_FIXED64); |
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260 | writeSFixed64NoTag(value); |
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261 | } |
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262 | |
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263 | /** Write an {@code sint32} field, including tag, to the stream. */ |
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264 | public void writeSInt32(final int fieldNumber, final int value) |
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265 | throws IOException { |
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266 | writeTag(fieldNumber, WireFormat.WIRETYPE_VARINT); |
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267 | writeSInt32NoTag(value); |
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268 | } |
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269 | |
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270 | /** Write an {@code sint64} field, including tag, to the stream. */ |
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271 | public void writeSInt64(final int fieldNumber, final long value) |
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272 | throws IOException { |
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273 | writeTag(fieldNumber, WireFormat.WIRETYPE_VARINT); |
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274 | writeSInt64NoTag(value); |
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275 | } |
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276 | |
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277 | /** |
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278 | * Write a MessageSet extension field to the stream. For historical reasons, |
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279 | * the wire format differs from normal fields. |
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280 | */ |
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281 | public void writeMessageSetExtension(final int fieldNumber, |
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282 | final MessageLite value) |
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283 | throws IOException { |
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284 | writeTag(WireFormat.MESSAGE_SET_ITEM, WireFormat.WIRETYPE_START_GROUP); |
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285 | writeUInt32(WireFormat.MESSAGE_SET_TYPE_ID, fieldNumber); |
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286 | writeMessage(WireFormat.MESSAGE_SET_MESSAGE, value); |
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287 | writeTag(WireFormat.MESSAGE_SET_ITEM, WireFormat.WIRETYPE_END_GROUP); |
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288 | } |
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289 | |
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290 | /** |
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291 | * Write an unparsed MessageSet extension field to the stream. For |
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292 | * historical reasons, the wire format differs from normal fields. |
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293 | */ |
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294 | public void writeRawMessageSetExtension(final int fieldNumber, |
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295 | final ByteString value) |
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296 | throws IOException { |
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297 | writeTag(WireFormat.MESSAGE_SET_ITEM, WireFormat.WIRETYPE_START_GROUP); |
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298 | writeUInt32(WireFormat.MESSAGE_SET_TYPE_ID, fieldNumber); |
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299 | writeBytes(WireFormat.MESSAGE_SET_MESSAGE, value); |
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300 | writeTag(WireFormat.MESSAGE_SET_ITEM, WireFormat.WIRETYPE_END_GROUP); |
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301 | } |
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302 | |
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303 | // ----------------------------------------------------------------- |
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304 | |
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305 | /** Write a {@code double} field to the stream. */ |
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306 | public void writeDoubleNoTag(final double value) throws IOException { |
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307 | writeRawLittleEndian64(Double.doubleToRawLongBits(value)); |
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308 | } |
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309 | |
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310 | /** Write a {@code float} field to the stream. */ |
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311 | public void writeFloatNoTag(final float value) throws IOException { |
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312 | writeRawLittleEndian32(Float.floatToRawIntBits(value)); |
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313 | } |
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314 | |
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315 | /** Write a {@code uint64} field to the stream. */ |
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316 | public void writeUInt64NoTag(final long value) throws IOException { |
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317 | writeRawVarint64(value); |
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318 | } |
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319 | |
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320 | /** Write an {@code int64} field to the stream. */ |
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321 | public void writeInt64NoTag(final long value) throws IOException { |
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322 | writeRawVarint64(value); |
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323 | } |
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324 | |
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325 | /** Write an {@code int32} field to the stream. */ |
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326 | public void writeInt32NoTag(final int value) throws IOException { |
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327 | if (value >= 0) { |
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328 | writeRawVarint32(value); |
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329 | } else { |
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330 | // Must sign-extend. |
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331 | writeRawVarint64(value); |
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332 | } |
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333 | } |
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334 | |
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335 | /** Write a {@code fixed64} field to the stream. */ |
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336 | public void writeFixed64NoTag(final long value) throws IOException { |
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337 | writeRawLittleEndian64(value); |
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338 | } |
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339 | |
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340 | /** Write a {@code fixed32} field to the stream. */ |
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341 | public void writeFixed32NoTag(final int value) throws IOException { |
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342 | writeRawLittleEndian32(value); |
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343 | } |
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344 | |
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345 | /** Write a {@code bool} field to the stream. */ |
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346 | public void writeBoolNoTag(final boolean value) throws IOException { |
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347 | writeRawByte(value ? 1 : 0); |
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348 | } |
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349 | |
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350 | /** Write a {@code string} field to the stream. */ |
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351 | public void writeStringNoTag(final String value) throws IOException { |
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352 | // Unfortunately there does not appear to be any way to tell Java to encode |
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353 | // UTF-8 directly into our buffer, so we have to let it create its own byte |
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354 | // array and then copy. |
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355 | final byte[] bytes = value.getBytes("UTF-8"); |
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356 | writeRawVarint32(bytes.length); |
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357 | writeRawBytes(bytes); |
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358 | } |
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359 | |
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360 | /** Write a {@code group} field to the stream. */ |
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361 | public void writeGroupNoTag(final MessageLite value) throws IOException { |
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362 | value.writeTo(this); |
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363 | } |
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364 | |
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365 | /** |
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366 | * Write a group represented by an {@link UnknownFieldSet}. |
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367 | * |
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368 | * @deprecated UnknownFieldSet now implements MessageLite, so you can just |
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369 | * call {@link #writeGroupNoTag}. |
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370 | */ |
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371 | @Deprecated |
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372 | public void writeUnknownGroupNoTag(final MessageLite value) |
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373 | throws IOException { |
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374 | writeGroupNoTag(value); |
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375 | } |
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376 | |
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377 | /** Write an embedded message field to the stream. */ |
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378 | public void writeMessageNoTag(final MessageLite value) throws IOException { |
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379 | writeRawVarint32(value.getSerializedSize()); |
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380 | value.writeTo(this); |
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381 | } |
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382 | |
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383 | /** Write a {@code bytes} field to the stream. */ |
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384 | public void writeBytesNoTag(final ByteString value) throws IOException { |
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385 | writeRawVarint32(value.size()); |
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386 | writeRawBytes(value); |
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387 | } |
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388 | |
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389 | /** Write a {@code uint32} field to the stream. */ |
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390 | public void writeUInt32NoTag(final int value) throws IOException { |
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391 | writeRawVarint32(value); |
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392 | } |
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393 | |
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394 | /** |
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395 | * Write an enum field to the stream. Caller is responsible |
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396 | * for converting the enum value to its numeric value. |
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397 | */ |
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398 | public void writeEnumNoTag(final int value) throws IOException { |
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399 | writeInt32NoTag(value); |
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400 | } |
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401 | |
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402 | /** Write an {@code sfixed32} field to the stream. */ |
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403 | public void writeSFixed32NoTag(final int value) throws IOException { |
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404 | writeRawLittleEndian32(value); |
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405 | } |
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406 | |
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407 | /** Write an {@code sfixed64} field to the stream. */ |
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408 | public void writeSFixed64NoTag(final long value) throws IOException { |
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409 | writeRawLittleEndian64(value); |
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410 | } |
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411 | |
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412 | /** Write an {@code sint32} field to the stream. */ |
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413 | public void writeSInt32NoTag(final int value) throws IOException { |
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414 | writeRawVarint32(encodeZigZag32(value)); |
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415 | } |
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416 | |
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417 | /** Write an {@code sint64} field to the stream. */ |
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418 | public void writeSInt64NoTag(final long value) throws IOException { |
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419 | writeRawVarint64(encodeZigZag64(value)); |
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420 | } |
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421 | |
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422 | // ================================================================= |
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423 | |
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424 | /** |
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425 | * Compute the number of bytes that would be needed to encode a |
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426 | * {@code double} field, including tag. |
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427 | */ |
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428 | public static int computeDoubleSize(final int fieldNumber, |
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429 | final double value) { |
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430 | return computeTagSize(fieldNumber) + computeDoubleSizeNoTag(value); |
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431 | } |
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432 | |
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433 | /** |
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434 | * Compute the number of bytes that would be needed to encode a |
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435 | * {@code float} field, including tag. |
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436 | */ |
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437 | public static int computeFloatSize(final int fieldNumber, final float value) { |
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438 | return computeTagSize(fieldNumber) + computeFloatSizeNoTag(value); |
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439 | } |
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440 | |
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441 | /** |
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442 | * Compute the number of bytes that would be needed to encode a |
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443 | * {@code uint64} field, including tag. |
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444 | */ |
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445 | public static int computeUInt64Size(final int fieldNumber, final long value) { |
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446 | return computeTagSize(fieldNumber) + computeUInt64SizeNoTag(value); |
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447 | } |
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448 | |
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449 | /** |
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450 | * Compute the number of bytes that would be needed to encode an |
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451 | * {@code int64} field, including tag. |
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452 | */ |
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453 | public static int computeInt64Size(final int fieldNumber, final long value) { |
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454 | return computeTagSize(fieldNumber) + computeInt64SizeNoTag(value); |
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455 | } |
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456 | |
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457 | /** |
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458 | * Compute the number of bytes that would be needed to encode an |
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459 | * {@code int32} field, including tag. |
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460 | */ |
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461 | public static int computeInt32Size(final int fieldNumber, final int value) { |
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462 | return computeTagSize(fieldNumber) + computeInt32SizeNoTag(value); |
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463 | } |
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464 | |
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465 | /** |
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466 | * Compute the number of bytes that would be needed to encode a |
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467 | * {@code fixed64} field, including tag. |
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468 | */ |
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469 | public static int computeFixed64Size(final int fieldNumber, |
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470 | final long value) { |
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471 | return computeTagSize(fieldNumber) + computeFixed64SizeNoTag(value); |
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472 | } |
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473 | |
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474 | /** |
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475 | * Compute the number of bytes that would be needed to encode a |
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476 | * {@code fixed32} field, including tag. |
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477 | */ |
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478 | public static int computeFixed32Size(final int fieldNumber, |
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479 | final int value) { |
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480 | return computeTagSize(fieldNumber) + computeFixed32SizeNoTag(value); |
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481 | } |
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482 | |
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483 | /** |
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484 | * Compute the number of bytes that would be needed to encode a |
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485 | * {@code bool} field, including tag. |
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486 | */ |
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487 | public static int computeBoolSize(final int fieldNumber, |
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488 | final boolean value) { |
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489 | return computeTagSize(fieldNumber) + computeBoolSizeNoTag(value); |
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490 | } |
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491 | |
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492 | /** |
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493 | * Compute the number of bytes that would be needed to encode a |
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494 | * {@code string} field, including tag. |
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495 | */ |
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496 | public static int computeStringSize(final int fieldNumber, |
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497 | final String value) { |
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498 | return computeTagSize(fieldNumber) + computeStringSizeNoTag(value); |
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499 | } |
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500 | |
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501 | /** |
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502 | * Compute the number of bytes that would be needed to encode a |
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503 | * {@code group} field, including tag. |
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504 | */ |
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505 | public static int computeGroupSize(final int fieldNumber, |
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506 | final MessageLite value) { |
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507 | return computeTagSize(fieldNumber) * 2 + computeGroupSizeNoTag(value); |
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508 | } |
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509 | |
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510 | /** |
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511 | * Compute the number of bytes that would be needed to encode a |
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512 | * {@code group} field represented by an {@code UnknownFieldSet}, including |
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513 | * tag. |
---|
514 | * |
---|
515 | * @deprecated UnknownFieldSet now implements MessageLite, so you can just |
---|
516 | * call {@link #computeGroupSize}. |
---|
517 | */ |
---|
518 | @Deprecated |
---|
519 | public static int computeUnknownGroupSize(final int fieldNumber, |
---|
520 | final MessageLite value) { |
---|
521 | return computeGroupSize(fieldNumber, value); |
---|
522 | } |
---|
523 | |
---|
524 | /** |
---|
525 | * Compute the number of bytes that would be needed to encode an |
---|
526 | * embedded message field, including tag. |
---|
527 | */ |
---|
528 | public static int computeMessageSize(final int fieldNumber, |
---|
529 | final MessageLite value) { |
---|
530 | return computeTagSize(fieldNumber) + computeMessageSizeNoTag(value); |
---|
531 | } |
---|
532 | |
---|
533 | /** |
---|
534 | * Compute the number of bytes that would be needed to encode a |
---|
535 | * {@code bytes} field, including tag. |
---|
536 | */ |
---|
537 | public static int computeBytesSize(final int fieldNumber, |
---|
538 | final ByteString value) { |
---|
539 | return computeTagSize(fieldNumber) + computeBytesSizeNoTag(value); |
---|
540 | } |
---|
541 | |
---|
542 | /** |
---|
543 | * Compute the number of bytes that would be needed to encode a |
---|
544 | * {@code uint32} field, including tag. |
---|
545 | */ |
---|
546 | public static int computeUInt32Size(final int fieldNumber, final int value) { |
---|
547 | return computeTagSize(fieldNumber) + computeUInt32SizeNoTag(value); |
---|
548 | } |
---|
549 | |
---|
550 | /** |
---|
551 | * Compute the number of bytes that would be needed to encode an |
---|
552 | * enum field, including tag. Caller is responsible for converting the |
---|
553 | * enum value to its numeric value. |
---|
554 | */ |
---|
555 | public static int computeEnumSize(final int fieldNumber, final int value) { |
---|
556 | return computeTagSize(fieldNumber) + computeEnumSizeNoTag(value); |
---|
557 | } |
---|
558 | |
---|
559 | /** |
---|
560 | * Compute the number of bytes that would be needed to encode an |
---|
561 | * {@code sfixed32} field, including tag. |
---|
562 | */ |
---|
563 | public static int computeSFixed32Size(final int fieldNumber, |
---|
564 | final int value) { |
---|
565 | return computeTagSize(fieldNumber) + computeSFixed32SizeNoTag(value); |
---|
566 | } |
---|
567 | |
---|
568 | /** |
---|
569 | * Compute the number of bytes that would be needed to encode an |
---|
570 | * {@code sfixed64} field, including tag. |
---|
571 | */ |
---|
572 | public static int computeSFixed64Size(final int fieldNumber, |
---|
573 | final long value) { |
---|
574 | return computeTagSize(fieldNumber) + computeSFixed64SizeNoTag(value); |
---|
575 | } |
---|
576 | |
---|
577 | /** |
---|
578 | * Compute the number of bytes that would be needed to encode an |
---|
579 | * {@code sint32} field, including tag. |
---|
580 | */ |
---|
581 | public static int computeSInt32Size(final int fieldNumber, final int value) { |
---|
582 | return computeTagSize(fieldNumber) + computeSInt32SizeNoTag(value); |
---|
583 | } |
---|
584 | |
---|
585 | /** |
---|
586 | * Compute the number of bytes that would be needed to encode an |
---|
587 | * {@code sint64} field, including tag. |
---|
588 | */ |
---|
589 | public static int computeSInt64Size(final int fieldNumber, final long value) { |
---|
590 | return computeTagSize(fieldNumber) + computeSInt64SizeNoTag(value); |
---|
591 | } |
---|
592 | |
---|
593 | /** |
---|
594 | * Compute the number of bytes that would be needed to encode a |
---|
595 | * MessageSet extension to the stream. For historical reasons, |
---|
596 | * the wire format differs from normal fields. |
---|
597 | */ |
---|
598 | public static int computeMessageSetExtensionSize( |
---|
599 | final int fieldNumber, final MessageLite value) { |
---|
600 | return computeTagSize(WireFormat.MESSAGE_SET_ITEM) * 2 + |
---|
601 | computeUInt32Size(WireFormat.MESSAGE_SET_TYPE_ID, fieldNumber) + |
---|
602 | computeMessageSize(WireFormat.MESSAGE_SET_MESSAGE, value); |
---|
603 | } |
---|
604 | |
---|
605 | /** |
---|
606 | * Compute the number of bytes that would be needed to encode an |
---|
607 | * unparsed MessageSet extension field to the stream. For |
---|
608 | * historical reasons, the wire format differs from normal fields. |
---|
609 | */ |
---|
610 | public static int computeRawMessageSetExtensionSize( |
---|
611 | final int fieldNumber, final ByteString value) { |
---|
612 | return computeTagSize(WireFormat.MESSAGE_SET_ITEM) * 2 + |
---|
613 | computeUInt32Size(WireFormat.MESSAGE_SET_TYPE_ID, fieldNumber) + |
---|
614 | computeBytesSize(WireFormat.MESSAGE_SET_MESSAGE, value); |
---|
615 | } |
---|
616 | |
---|
617 | // ----------------------------------------------------------------- |
---|
618 | |
---|
619 | /** |
---|
620 | * Compute the number of bytes that would be needed to encode a |
---|
621 | * {@code double} field, including tag. |
---|
622 | */ |
---|
623 | public static int computeDoubleSizeNoTag(final double value) { |
---|
624 | return LITTLE_ENDIAN_64_SIZE; |
---|
625 | } |
---|
626 | |
---|
627 | /** |
---|
628 | * Compute the number of bytes that would be needed to encode a |
---|
629 | * {@code float} field, including tag. |
---|
630 | */ |
---|
631 | public static int computeFloatSizeNoTag(final float value) { |
---|
632 | return LITTLE_ENDIAN_32_SIZE; |
---|
633 | } |
---|
634 | |
---|
635 | /** |
---|
636 | * Compute the number of bytes that would be needed to encode a |
---|
637 | * {@code uint64} field, including tag. |
---|
638 | */ |
---|
639 | public static int computeUInt64SizeNoTag(final long value) { |
---|
640 | return computeRawVarint64Size(value); |
---|
641 | } |
---|
642 | |
---|
643 | /** |
---|
644 | * Compute the number of bytes that would be needed to encode an |
---|
645 | * {@code int64} field, including tag. |
---|
646 | */ |
---|
647 | public static int computeInt64SizeNoTag(final long value) { |
---|
648 | return computeRawVarint64Size(value); |
---|
649 | } |
---|
650 | |
---|
651 | /** |
---|
652 | * Compute the number of bytes that would be needed to encode an |
---|
653 | * {@code int32} field, including tag. |
---|
654 | */ |
---|
655 | public static int computeInt32SizeNoTag(final int value) { |
---|
656 | if (value >= 0) { |
---|
657 | return computeRawVarint32Size(value); |
---|
658 | } else { |
---|
659 | // Must sign-extend. |
---|
660 | return 10; |
---|
661 | } |
---|
662 | } |
---|
663 | |
---|
664 | /** |
---|
665 | * Compute the number of bytes that would be needed to encode a |
---|
666 | * {@code fixed64} field. |
---|
667 | */ |
---|
668 | public static int computeFixed64SizeNoTag(final long value) { |
---|
669 | return LITTLE_ENDIAN_64_SIZE; |
---|
670 | } |
---|
671 | |
---|
672 | /** |
---|
673 | * Compute the number of bytes that would be needed to encode a |
---|
674 | * {@code fixed32} field. |
---|
675 | */ |
---|
676 | public static int computeFixed32SizeNoTag(final int value) { |
---|
677 | return LITTLE_ENDIAN_32_SIZE; |
---|
678 | } |
---|
679 | |
---|
680 | /** |
---|
681 | * Compute the number of bytes that would be needed to encode a |
---|
682 | * {@code bool} field. |
---|
683 | */ |
---|
684 | public static int computeBoolSizeNoTag(final boolean value) { |
---|
685 | return 1; |
---|
686 | } |
---|
687 | |
---|
688 | /** |
---|
689 | * Compute the number of bytes that would be needed to encode a |
---|
690 | * {@code string} field. |
---|
691 | */ |
---|
692 | public static int computeStringSizeNoTag(final String value) { |
---|
693 | try { |
---|
694 | final byte[] bytes = value.getBytes("UTF-8"); |
---|
695 | return computeRawVarint32Size(bytes.length) + |
---|
696 | bytes.length; |
---|
697 | } catch (UnsupportedEncodingException e) { |
---|
698 | throw new RuntimeException("UTF-8 not supported.", e); |
---|
699 | } |
---|
700 | } |
---|
701 | |
---|
702 | /** |
---|
703 | * Compute the number of bytes that would be needed to encode a |
---|
704 | * {@code group} field. |
---|
705 | */ |
---|
706 | public static int computeGroupSizeNoTag(final MessageLite value) { |
---|
707 | return value.getSerializedSize(); |
---|
708 | } |
---|
709 | |
---|
710 | /** |
---|
711 | * Compute the number of bytes that would be needed to encode a |
---|
712 | * {@code group} field represented by an {@code UnknownFieldSet}, including |
---|
713 | * tag. |
---|
714 | * |
---|
715 | * @deprecated UnknownFieldSet now implements MessageLite, so you can just |
---|
716 | * call {@link #computeUnknownGroupSizeNoTag}. |
---|
717 | */ |
---|
718 | @Deprecated |
---|
719 | public static int computeUnknownGroupSizeNoTag(final MessageLite value) { |
---|
720 | return computeGroupSizeNoTag(value); |
---|
721 | } |
---|
722 | |
---|
723 | /** |
---|
724 | * Compute the number of bytes that would be needed to encode an embedded |
---|
725 | * message field. |
---|
726 | */ |
---|
727 | public static int computeMessageSizeNoTag(final MessageLite value) { |
---|
728 | final int size = value.getSerializedSize(); |
---|
729 | return computeRawVarint32Size(size) + size; |
---|
730 | } |
---|
731 | |
---|
732 | /** |
---|
733 | * Compute the number of bytes that would be needed to encode a |
---|
734 | * {@code bytes} field. |
---|
735 | */ |
---|
736 | public static int computeBytesSizeNoTag(final ByteString value) { |
---|
737 | return computeRawVarint32Size(value.size()) + |
---|
738 | value.size(); |
---|
739 | } |
---|
740 | |
---|
741 | /** |
---|
742 | * Compute the number of bytes that would be needed to encode a |
---|
743 | * {@code uint32} field. |
---|
744 | */ |
---|
745 | public static int computeUInt32SizeNoTag(final int value) { |
---|
746 | return computeRawVarint32Size(value); |
---|
747 | } |
---|
748 | |
---|
749 | /** |
---|
750 | * Compute the number of bytes that would be needed to encode an enum field. |
---|
751 | * Caller is responsible for converting the enum value to its numeric value. |
---|
752 | */ |
---|
753 | public static int computeEnumSizeNoTag(final int value) { |
---|
754 | return computeInt32SizeNoTag(value); |
---|
755 | } |
---|
756 | |
---|
757 | /** |
---|
758 | * Compute the number of bytes that would be needed to encode an |
---|
759 | * {@code sfixed32} field. |
---|
760 | */ |
---|
761 | public static int computeSFixed32SizeNoTag(final int value) { |
---|
762 | return LITTLE_ENDIAN_32_SIZE; |
---|
763 | } |
---|
764 | |
---|
765 | /** |
---|
766 | * Compute the number of bytes that would be needed to encode an |
---|
767 | * {@code sfixed64} field. |
---|
768 | */ |
---|
769 | public static int computeSFixed64SizeNoTag(final long value) { |
---|
770 | return LITTLE_ENDIAN_64_SIZE; |
---|
771 | } |
---|
772 | |
---|
773 | /** |
---|
774 | * Compute the number of bytes that would be needed to encode an |
---|
775 | * {@code sint32} field. |
---|
776 | */ |
---|
777 | public static int computeSInt32SizeNoTag(final int value) { |
---|
778 | return computeRawVarint32Size(encodeZigZag32(value)); |
---|
779 | } |
---|
780 | |
---|
781 | /** |
---|
782 | * Compute the number of bytes that would be needed to encode an |
---|
783 | * {@code sint64} field. |
---|
784 | */ |
---|
785 | public static int computeSInt64SizeNoTag(final long value) { |
---|
786 | return computeRawVarint64Size(encodeZigZag64(value)); |
---|
787 | } |
---|
788 | |
---|
789 | // ================================================================= |
---|
790 | |
---|
791 | /** |
---|
792 | * Internal helper that writes the current buffer to the output. The |
---|
793 | * buffer position is reset to its initial value when this returns. |
---|
794 | */ |
---|
795 | private void refreshBuffer() throws IOException { |
---|
796 | if (output == null) { |
---|
797 | // We're writing to a single buffer. |
---|
798 | throw new OutOfSpaceException(); |
---|
799 | } |
---|
800 | |
---|
801 | // Since we have an output stream, this is our buffer |
---|
802 | // and buffer offset == 0 |
---|
803 | output.write(buffer, 0, position); |
---|
804 | position = 0; |
---|
805 | } |
---|
806 | |
---|
807 | /** |
---|
808 | * Flushes the stream and forces any buffered bytes to be written. This |
---|
809 | * does not flush the underlying OutputStream. |
---|
810 | */ |
---|
811 | public void flush() throws IOException { |
---|
812 | if (output != null) { |
---|
813 | refreshBuffer(); |
---|
814 | } |
---|
815 | } |
---|
816 | |
---|
817 | /** |
---|
818 | * If writing to a flat array, return the space left in the array. |
---|
819 | * Otherwise, throws {@code UnsupportedOperationException}. |
---|
820 | */ |
---|
821 | public int spaceLeft() { |
---|
822 | if (output == null) { |
---|
823 | return limit - position; |
---|
824 | } else { |
---|
825 | throw new UnsupportedOperationException( |
---|
826 | "spaceLeft() can only be called on CodedOutputStreams that are " + |
---|
827 | "writing to a flat array."); |
---|
828 | } |
---|
829 | } |
---|
830 | |
---|
831 | /** |
---|
832 | * Verifies that {@link #spaceLeft()} returns zero. It's common to create |
---|
833 | * a byte array that is exactly big enough to hold a message, then write to |
---|
834 | * it with a {@code CodedOutputStream}. Calling {@code checkNoSpaceLeft()} |
---|
835 | * after writing verifies that the message was actually as big as expected, |
---|
836 | * which can help catch bugs. |
---|
837 | */ |
---|
838 | public void checkNoSpaceLeft() { |
---|
839 | if (spaceLeft() != 0) { |
---|
840 | throw new IllegalStateException( |
---|
841 | "Did not write as much data as expected."); |
---|
842 | } |
---|
843 | } |
---|
844 | |
---|
845 | /** |
---|
846 | * If you create a CodedOutputStream around a simple flat array, you must |
---|
847 | * not attempt to write more bytes than the array has space. Otherwise, |
---|
848 | * this exception will be thrown. |
---|
849 | */ |
---|
850 | public static class OutOfSpaceException extends IOException { |
---|
851 | private static final long serialVersionUID = -6947486886997889499L; |
---|
852 | |
---|
853 | OutOfSpaceException() { |
---|
854 | super("CodedOutputStream was writing to a flat byte array and ran " + |
---|
855 | "out of space."); |
---|
856 | } |
---|
857 | } |
---|
858 | |
---|
859 | /** Write a single byte. */ |
---|
860 | public void writeRawByte(final byte value) throws IOException { |
---|
861 | if (position == limit) { |
---|
862 | refreshBuffer(); |
---|
863 | } |
---|
864 | |
---|
865 | buffer[position++] = value; |
---|
866 | } |
---|
867 | |
---|
868 | /** Write a single byte, represented by an integer value. */ |
---|
869 | public void writeRawByte(final int value) throws IOException { |
---|
870 | writeRawByte((byte) value); |
---|
871 | } |
---|
872 | |
---|
873 | /** Write a byte string. */ |
---|
874 | public void writeRawBytes(final ByteString value) throws IOException { |
---|
875 | writeRawBytes(value, 0, value.size()); |
---|
876 | } |
---|
877 | |
---|
878 | /** Write an array of bytes. */ |
---|
879 | public void writeRawBytes(final byte[] value) throws IOException { |
---|
880 | writeRawBytes(value, 0, value.length); |
---|
881 | } |
---|
882 | |
---|
883 | /** Write part of an array of bytes. */ |
---|
884 | public void writeRawBytes(final byte[] value, int offset, int length) |
---|
885 | throws IOException { |
---|
886 | if (limit - position >= length) { |
---|
887 | // We have room in the current buffer. |
---|
888 | System.arraycopy(value, offset, buffer, position, length); |
---|
889 | position += length; |
---|
890 | } else { |
---|
891 | // Write extends past current buffer. Fill the rest of this buffer and |
---|
892 | // flush. |
---|
893 | final int bytesWritten = limit - position; |
---|
894 | System.arraycopy(value, offset, buffer, position, bytesWritten); |
---|
895 | offset += bytesWritten; |
---|
896 | length -= bytesWritten; |
---|
897 | position = limit; |
---|
898 | refreshBuffer(); |
---|
899 | |
---|
900 | // Now deal with the rest. |
---|
901 | // Since we have an output stream, this is our buffer |
---|
902 | // and buffer offset == 0 |
---|
903 | if (length <= limit) { |
---|
904 | // Fits in new buffer. |
---|
905 | System.arraycopy(value, offset, buffer, 0, length); |
---|
906 | position = length; |
---|
907 | } else { |
---|
908 | // Write is very big. Let's do it all at once. |
---|
909 | output.write(value, offset, length); |
---|
910 | } |
---|
911 | } |
---|
912 | } |
---|
913 | |
---|
914 | /** Write part of a byte string. */ |
---|
915 | public void writeRawBytes(final ByteString value, int offset, int length) |
---|
916 | throws IOException { |
---|
917 | if (limit - position >= length) { |
---|
918 | // We have room in the current buffer. |
---|
919 | value.copyTo(buffer, offset, position, length); |
---|
920 | position += length; |
---|
921 | } else { |
---|
922 | // Write extends past current buffer. Fill the rest of this buffer and |
---|
923 | // flush. |
---|
924 | final int bytesWritten = limit - position; |
---|
925 | value.copyTo(buffer, offset, position, bytesWritten); |
---|
926 | offset += bytesWritten; |
---|
927 | length -= bytesWritten; |
---|
928 | position = limit; |
---|
929 | refreshBuffer(); |
---|
930 | |
---|
931 | // Now deal with the rest. |
---|
932 | // Since we have an output stream, this is our buffer |
---|
933 | // and buffer offset == 0 |
---|
934 | if (length <= limit) { |
---|
935 | // Fits in new buffer. |
---|
936 | value.copyTo(buffer, offset, 0, length); |
---|
937 | position = length; |
---|
938 | } else { |
---|
939 | // Write is very big, but we can't do it all at once without allocating |
---|
940 | // an a copy of the byte array since ByteString does not give us access |
---|
941 | // to the underlying bytes. Use the InputStream interface on the |
---|
942 | // ByteString and our buffer to copy between the two. |
---|
943 | InputStream inputStreamFrom = value.newInput(); |
---|
944 | if (offset != inputStreamFrom.skip(offset)) { |
---|
945 | throw new IllegalStateException("Skip failed? Should never happen."); |
---|
946 | } |
---|
947 | // Use the buffer as the temporary buffer to avoid allocating memory. |
---|
948 | while (length > 0) { |
---|
949 | int bytesToRead = Math.min(length, limit); |
---|
950 | int bytesRead = inputStreamFrom.read(buffer, 0, bytesToRead); |
---|
951 | if (bytesRead != bytesToRead) { |
---|
952 | throw new IllegalStateException("Read failed? Should never happen"); |
---|
953 | } |
---|
954 | output.write(buffer, 0, bytesRead); |
---|
955 | length -= bytesRead; |
---|
956 | } |
---|
957 | } |
---|
958 | } |
---|
959 | } |
---|
960 | |
---|
961 | /** Encode and write a tag. */ |
---|
962 | public void writeTag(final int fieldNumber, final int wireType) |
---|
963 | throws IOException { |
---|
964 | writeRawVarint32(WireFormat.makeTag(fieldNumber, wireType)); |
---|
965 | } |
---|
966 | |
---|
967 | /** Compute the number of bytes that would be needed to encode a tag. */ |
---|
968 | public static int computeTagSize(final int fieldNumber) { |
---|
969 | return computeRawVarint32Size(WireFormat.makeTag(fieldNumber, 0)); |
---|
970 | } |
---|
971 | |
---|
972 | /** |
---|
973 | * Encode and write a varint. {@code value} is treated as |
---|
974 | * unsigned, so it won't be sign-extended if negative. |
---|
975 | */ |
---|
976 | public void writeRawVarint32(int value) throws IOException { |
---|
977 | while (true) { |
---|
978 | if ((value & ~0x7F) == 0) { |
---|
979 | writeRawByte(value); |
---|
980 | return; |
---|
981 | } else { |
---|
982 | writeRawByte((value & 0x7F) | 0x80); |
---|
983 | value >>>= 7; |
---|
984 | } |
---|
985 | } |
---|
986 | } |
---|
987 | |
---|
988 | /** |
---|
989 | * Compute the number of bytes that would be needed to encode a varint. |
---|
990 | * {@code value} is treated as unsigned, so it won't be sign-extended if |
---|
991 | * negative. |
---|
992 | */ |
---|
993 | public static int computeRawVarint32Size(final int value) { |
---|
994 | if ((value & (0xffffffff << 7)) == 0) return 1; |
---|
995 | if ((value & (0xffffffff << 14)) == 0) return 2; |
---|
996 | if ((value & (0xffffffff << 21)) == 0) return 3; |
---|
997 | if ((value & (0xffffffff << 28)) == 0) return 4; |
---|
998 | return 5; |
---|
999 | } |
---|
1000 | |
---|
1001 | /** Encode and write a varint. */ |
---|
1002 | public void writeRawVarint64(long value) throws IOException { |
---|
1003 | while (true) { |
---|
1004 | if ((value & ~0x7FL) == 0) { |
---|
1005 | writeRawByte((int)value); |
---|
1006 | return; |
---|
1007 | } else { |
---|
1008 | writeRawByte(((int)value & 0x7F) | 0x80); |
---|
1009 | value >>>= 7; |
---|
1010 | } |
---|
1011 | } |
---|
1012 | } |
---|
1013 | |
---|
1014 | /** Compute the number of bytes that would be needed to encode a varint. */ |
---|
1015 | public static int computeRawVarint64Size(final long value) { |
---|
1016 | if ((value & (0xffffffffffffffffL << 7)) == 0) return 1; |
---|
1017 | if ((value & (0xffffffffffffffffL << 14)) == 0) return 2; |
---|
1018 | if ((value & (0xffffffffffffffffL << 21)) == 0) return 3; |
---|
1019 | if ((value & (0xffffffffffffffffL << 28)) == 0) return 4; |
---|
1020 | if ((value & (0xffffffffffffffffL << 35)) == 0) return 5; |
---|
1021 | if ((value & (0xffffffffffffffffL << 42)) == 0) return 6; |
---|
1022 | if ((value & (0xffffffffffffffffL << 49)) == 0) return 7; |
---|
1023 | if ((value & (0xffffffffffffffffL << 56)) == 0) return 8; |
---|
1024 | if ((value & (0xffffffffffffffffL << 63)) == 0) return 9; |
---|
1025 | return 10; |
---|
1026 | } |
---|
1027 | |
---|
1028 | /** Write a little-endian 32-bit integer. */ |
---|
1029 | public void writeRawLittleEndian32(final int value) throws IOException { |
---|
1030 | writeRawByte((value ) & 0xFF); |
---|
1031 | writeRawByte((value >> 8) & 0xFF); |
---|
1032 | writeRawByte((value >> 16) & 0xFF); |
---|
1033 | writeRawByte((value >> 24) & 0xFF); |
---|
1034 | } |
---|
1035 | |
---|
1036 | public static final int LITTLE_ENDIAN_32_SIZE = 4; |
---|
1037 | |
---|
1038 | /** Write a little-endian 64-bit integer. */ |
---|
1039 | public void writeRawLittleEndian64(final long value) throws IOException { |
---|
1040 | writeRawByte((int)(value ) & 0xFF); |
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1041 | writeRawByte((int)(value >> 8) & 0xFF); |
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1042 | writeRawByte((int)(value >> 16) & 0xFF); |
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1043 | writeRawByte((int)(value >> 24) & 0xFF); |
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1044 | writeRawByte((int)(value >> 32) & 0xFF); |
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1045 | writeRawByte((int)(value >> 40) & 0xFF); |
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1046 | writeRawByte((int)(value >> 48) & 0xFF); |
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1047 | writeRawByte((int)(value >> 56) & 0xFF); |
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1048 | } |
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1049 | |
---|
1050 | public static final int LITTLE_ENDIAN_64_SIZE = 8; |
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1051 | |
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1052 | /** |
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1053 | * Encode a ZigZag-encoded 32-bit value. ZigZag encodes signed integers |
---|
1054 | * into values that can be efficiently encoded with varint. (Otherwise, |
---|
1055 | * negative values must be sign-extended to 64 bits to be varint encoded, |
---|
1056 | * thus always taking 10 bytes on the wire.) |
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1057 | * |
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1058 | * @param n A signed 32-bit integer. |
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1059 | * @return An unsigned 32-bit integer, stored in a signed int because |
---|
1060 | * Java has no explicit unsigned support. |
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1061 | */ |
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1062 | public static int encodeZigZag32(final int n) { |
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1063 | // Note: the right-shift must be arithmetic |
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1064 | return (n << 1) ^ (n >> 31); |
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1065 | } |
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1066 | |
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1067 | /** |
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1068 | * Encode a ZigZag-encoded 64-bit value. ZigZag encodes signed integers |
---|
1069 | * into values that can be efficiently encoded with varint. (Otherwise, |
---|
1070 | * negative values must be sign-extended to 64 bits to be varint encoded, |
---|
1071 | * thus always taking 10 bytes on the wire.) |
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1072 | * |
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1073 | * @param n A signed 64-bit integer. |
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1074 | * @return An unsigned 64-bit integer, stored in a signed int because |
---|
1075 | * Java has no explicit unsigned support. |
---|
1076 | */ |
---|
1077 | public static long encodeZigZag64(final long n) { |
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1078 | // Note: the right-shift must be arithmetic |
---|
1079 | return (n << 1) ^ (n >> 63); |
---|
1080 | } |
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1081 | } |
---|