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annotate IO/BinaryReaderBigEndian.cs @ 32:267cd5ce66ff

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Add "Position" property to Big-Endian binary reader no-open-ticket
author IBBoard <dev@ibboard.co.uk>
date Sun, 17 May 2009 18:54:11 +0000
parents 23fd4247fc1c
children
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1 // This file (FileStreamstream.cs) is a part of the IBBoard project and is copyright 2009 IBBoard
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2 //
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3 // The file and the library/program it is in are licensed under the GNU LGPL license, either version 3 of the License or (at your option) any later version. Please see COPYING.LGPL for more information and the full license.
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4 //
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5
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6 using System;
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7 using System.Collections.Generic;
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8 using System.IO;
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9 using System.Text;
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10
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11 namespace IBBoard
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12 {
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13 /// <summary>
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14 /// A custom replacement for the BinaryReader that reads numbers as big-endian and also provides methods to read byte delimited strings.
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15 /// </summary>
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16 public class BinaryReaderBigEndian
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17 {
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18 private Stream stream;
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19 private Encoding encoding;
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20
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21 public BinaryReaderBigEndian(Stream input) : this(input, Encoding.UTF8)
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22 {
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23 }
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25 public BinaryReaderBigEndian(Stream input, Encoding encoding)
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26 {
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27 stream = input;
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28 this.encoding = encoding;
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29 }
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30
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31 public byte[] ReadBytes(int byteCount)
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32 {
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33 byte[] bytes = new byte[byteCount];
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34 stream.Read(bytes, 0, byteCount);
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35 return bytes;
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36 }
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37
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38 private byte[] ReadBytesForNumber(int byteCount)
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39 {
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40 byte[] bytes = ReadBytes(byteCount);
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41 int halfCount = byteCount / 2;
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42
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43 for (int i = 0, j = byteCount - 1; i < halfCount; i++, j--)
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44 {
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45 byte temp = bytes[i];
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46 bytes[i] = bytes[j];
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47 bytes[j] = temp;
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48 }
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49
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50 return bytes;
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51 }
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52
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53 public byte ReadByte()
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54 {
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55 return (byte)stream.ReadByte();
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56 }
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57
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58 public short ReadShort()
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59 {
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60 return BitConverter.ToInt16(ReadBytesForNumber(2), 0);
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61 }
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62
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63 public ushort ReadUShort()
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64 {
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65 return BitConverter.ToUInt16(ReadBytesForNumber(2), 0);
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66 }
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67
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68 public int ReadInt()
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69 {
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70 return BitConverter.ToInt32(ReadBytesForNumber(4), 0);
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71 }
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72
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73 public uint ReadUInt()
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74 {
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75 return BitConverter.ToUInt32(ReadBytesForNumber(4), 0);
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76 }
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77
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78 public string ReadDelimitedString(byte delimiter)
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79 {
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80 List<byte> bytes = new List<byte>();
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81
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82 while (!EndOfStream)
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83 {
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84 byte b = ReadByte();
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85
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86 if (b!=delimiter)
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87 {
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88 bytes.Add(b);
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89 }
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90 else
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91 {
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92 break;
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93 }
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94 }
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95
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96 return encoding.GetString(bytes.ToArray());
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97 }
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98
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99 public string ReadString(int length)
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100 {
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101 byte[] bytes = ReadBytes(length);
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102 return encoding.GetString(bytes);
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103 }
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104
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105 public string ReadUShortLengthString()
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106 {
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107 ushort length = ReadUShort();
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108 return ReadString(length);
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109 }
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110
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111 public string ReadIntLengthString()
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112 {
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113 int length = ReadInt();
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114 return ReadString(length);
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115 }
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116
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117 public void Seek(int distance)
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118 {
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119 stream.Seek(distance, SeekOrigin.Begin);
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120 }
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121
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122 public void Move(int distance)
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123 {
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124 stream.Seek(distance, SeekOrigin.Current);
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125 }
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126
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127 public void Close()
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128 {
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129 stream.Close();
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130 }
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131
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132 public bool EndOfStream
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133 {
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134 get { return stream.Length - 1 == stream.Position; }
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135 }
32
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136
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137 public long Position
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138 {
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139 get { return stream.Position; }
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140 }
30
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141 }
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142 }