Mercurial > hg > ucis.core

annotate ProtocolBuffers.cs @ 49:7e4dae99f919

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USBLib: fix unhandled exception in WinUSB shutdown after failure to open device
author Ivo Smits <Ivo@UCIS.nl>
date Mon, 19 Aug 2013 16:56:50 +0200
parents 5d9a7186c9f7
children
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11
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1 ???using System;
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2 using System.IO;
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3 using System.Text;
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4
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5 namespace UCIS.ProtocolBuffers {
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6 public interface IPBReader {
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7 void Reset();
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8 Boolean NextField();
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9 int FieldNumber { get; }
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10 int WireType { get; }
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11 Int64 GetVarint();
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12 Int64 GetFixed64();
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13 Byte[] GetBytes();
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14 String GetString();
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15 IPBReader GetMessageReader();
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16 Int32 GetFixed32();
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17 }
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18 public interface IPBWriter {
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19 void WriteVarint(int fieldNumber, Int64 value);
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20 void WriteFixed64(int fieldNumber, Int64 value);
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21 void WriteBytes(int fieldNumber, Byte[] bytes);
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22 void WriteBytes(int fieldNumber, Byte[] bytes, int offset, int count);
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23 void WriteFixed32(int fieldNumber, Int32 value);
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24 }
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25 public interface IPBMessage {
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26 void Decode(IPBReader r);
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27 void Encode(IPBWriter w);
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28 }
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29 public class ArrayPBReader : IPBReader {
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30 Byte[] buffer;
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31 int offset, length, index;
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32 int currentField;
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33 Boolean hasCurrentField;
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34 int currentFieldLength;
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35
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36 public ArrayPBReader(Byte[] buffer) : this(buffer, 0, buffer.Length) { }
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37 public ArrayPBReader(Byte[] buffer, int offset, int length) {
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38 this.buffer = buffer;
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39 this.offset = offset;
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40 this.length = length;
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41 Reset();
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42 }
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43
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44 public void Reset() {
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45 index = 0;
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46 hasCurrentField = false;
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47 }
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48
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49 public bool NextField() {
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50 if (hasCurrentField) {
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51 index += currentFieldLength;
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52 hasCurrentField = false;
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53 }
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54 if (index >= length) return false;
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55 index += ReadVarIntTo(out currentField);
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56 int dummy;
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57 switch (WireType) {
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58 case 0: currentFieldLength = ReadVarIntTo(out dummy); ; break; //Varint
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59 case 1: currentFieldLength = 8; break; //64bit
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60 case 2: index += ReadVarIntTo(out currentFieldLength); break; //Bytes
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61 case 5: currentFieldLength = 4; break; //32bit
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62 default: throw new InvalidDataException();
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63 }
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64 if (index + currentFieldLength > length) throw new InvalidDataException();
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65 hasCurrentField = true;
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66 return true;
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67 }
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68
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69 private int ReadVarIntTo(out int v) {
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70 long vl;
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71 int l = ReadVarIntTo(out vl);
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72 v = (int)vl;
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73 return l;
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74 }
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75 private int ReadVarIntTo(out long v) {
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76 v = 0;
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77 int h = 0;
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78 int b = 0x80;
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79 int l = 0;
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80 while ((b & 0x80) != 0) {
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81 b = buffer[offset + index + l];
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82 v |= ((long)b & 0x7FL) << h;
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83 h += 7;
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84 l++;
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85 }
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86 return l;
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87 }
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88
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89 public int FieldNumber { get { return (int)((UInt32)currentField >> 3); } }
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90 public int WireType { get { return currentField & 7; } }
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91
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92 public long GetVarint() {
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93 if (!hasCurrentField || WireType != 0) throw new InvalidOperationException();
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94 long v;
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95 ReadVarIntTo(out v);
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96 return v;
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97 }
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98
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99 public long GetFixed64() {
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100 if (!hasCurrentField || WireType != 1) throw new InvalidOperationException();
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101 int i = offset + index;
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102 return ((long)buffer[i + 0] << 0) | ((long)buffer[i + 1] << 8) | ((long)buffer[i + 2] << 16) | ((long)buffer[i + 3] << 24) |
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103 ((long)buffer[i + 4] << 32) | ((long)buffer[i + 5] << 40) | ((long)buffer[i + 6] << 48) | ((long)buffer[i + 7] << 56);
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104 }
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105
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106 public byte[] GetBytes() {
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107 if (!hasCurrentField || WireType != 2) throw new InvalidOperationException();
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108 Byte[] bytes = new Byte[currentFieldLength];
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109 Buffer.BlockCopy(buffer, offset + index, bytes, 0, currentFieldLength);
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110 return bytes;
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111 }
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112
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113 public string GetString() {
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114 if (!hasCurrentField || WireType != 2) throw new InvalidOperationException();
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115 return Encoding.UTF8.GetString(buffer, offset + index, currentFieldLength);
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116 }
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117
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118 public IPBReader GetMessageReader() {
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119 if (!hasCurrentField || WireType != 2) throw new InvalidOperationException();
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120 return new ArrayPBReader(buffer, offset + index, currentFieldLength);
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121 }
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122
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123 public int GetFixed32() {
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124 if (!hasCurrentField || WireType != 5) throw new InvalidOperationException();
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125 int i = offset + index;
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126 return ((int)buffer[i + 0] << 0) | ((int)buffer[i + 1] << 8) | ((int)buffer[i + 2] << 16) | ((int)buffer[i + 3] << 24);
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127 }
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128 }
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129 public class StreamPBWriter : IPBWriter {
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130 Stream stream;
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131
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132 public StreamPBWriter(Stream stream) {
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133 this.stream = stream;
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134 }
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135
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136 public static Byte[] Encode(IPBMessage message) {
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137 using (MemoryStream ms = new MemoryStream()) {
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138 message.Encode(new StreamPBWriter(ms));
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139 return ms.ToArray();
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140 }
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141 }
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142
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143 public static int EncodeToStreamBuffered(Stream stream, IPBMessage message) {
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144 using (MemoryStream ms = new MemoryStream()) {
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145 message.Encode(new StreamPBWriter(ms));
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146 ms.WriteTo(stream);
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147 return (int)ms.Length;
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148 }
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149 }
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150
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151 private void WriteVarint(long value) {
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152 while ((value & ~0x7fL) != 0) {
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153 stream.WriteByte((Byte)(0x80 | value));
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154 value = (long)((ulong)value >> 7);
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155 }
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156 stream.WriteByte((Byte)value);
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157 }
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158 private void WriteTag(int fieldNumber, int wireType) {
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159 WriteVarint((fieldNumber << 3) | wireType);
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160 }
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161
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162 public void WriteVarint(int fieldNumber, long value) {
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163 WriteTag(fieldNumber, 0);
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164 WriteVarint(value);
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165 }
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166
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167 public void WriteFixed64(int fieldNumber, long value) {
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168 WriteTag(fieldNumber, 1);
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169 for (int i = 0; i < 8; i++) {
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170 stream.WriteByte((Byte)value);
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171 value >>= 8;
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172 }
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173 }
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174
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175 public void WriteBytes(int fieldNumber, byte[] bytes) {
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176 WriteBytes(fieldNumber, bytes, 0, bytes.Length);
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177 }
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178
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179 public void WriteBytes(int fieldNumber, byte[] bytes, int offset, int count) {
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180 WriteTag(fieldNumber, 2);
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181 WriteVarint(count);
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182 stream.Write(bytes, offset, count);
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183 }
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184
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185 public void WriteFixed32(int fieldNumber, int value) {
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186 WriteTag(fieldNumber, 5);
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187 for (int i = 0; i < 4; i++) {
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188 stream.WriteByte((Byte)value);
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189 value >>= 8;
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190 }
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191 }
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192 }
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193 }