corrade-vassal – Blame information for rev 1
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1 | vero | 1 | /* |
2 | * Copyright (c) 2006-2014, openmetaverse.org |
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3 | * All rights reserved. |
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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 met: |
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7 | * |
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8 | * - Redistributions of source code must retain the above copyright notice, this |
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9 | * list of conditions and the following disclaimer. |
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10 | * - Neither the name of the openmetaverse.org nor the names |
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11 | * of its contributors may be used to endorse or promote products derived from |
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12 | * this software without specific prior written permission. |
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13 | * |
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14 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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15 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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16 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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17 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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18 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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19 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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20 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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21 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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22 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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23 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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24 | * POSSIBILITY OF SUCH DAMAGE. |
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25 | */ |
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26 | |||
27 | using System; |
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28 | using System.IO; |
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29 | |||
30 | namespace OpenMetaverse.Rendering |
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31 | { |
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32 | /// <summary> |
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33 | /// Binary reader, which is endian aware |
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34 | /// </summary> |
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35 | public class EndianAwareBinaryReader : BinaryReader |
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36 | { |
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37 | /// What is the format of the source file |
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38 | public enum SourceFormat |
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39 | { |
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40 | BigEndian, //!< The stream is big endian, SPARC, Arm and friends |
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41 | LittleEndian //!< x86 and friends |
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42 | } |
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43 | |||
44 | private byte[] m_a16 = new byte[2]; //!< Temporary storage area for 2 byte values |
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45 | private byte[] m_a32 = new byte[4]; //!< Temporary storage area for 4 byte values |
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46 | private byte[] m_a64 = new byte[8]; //!< Temporary storage area for 8 byte values |
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47 | |||
48 | private readonly bool m_shouldReverseOrder; //!< true if the file is in a different endian format than the system |
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49 | |||
50 | /// <summary> |
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51 | /// Construct a reader from a stream |
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52 | /// </summary> |
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53 | /// <param name="stream">The stream to read from</param> |
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54 | public EndianAwareBinaryReader(Stream stream) |
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55 | : this(stream, SourceFormat.LittleEndian) {} |
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56 | |||
57 | /// <summary> |
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58 | /// Construct a reader from a stream |
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59 | /// </summary> |
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60 | /// <param name="stream">The stream to read from</param> |
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61 | /// <param name="format">What is the format of the file, assumes PC and similar architecture</param> |
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62 | public EndianAwareBinaryReader(Stream stream, SourceFormat format) |
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63 | : base(stream) |
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64 | { |
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65 | if ((format == SourceFormat.BigEndian && BitConverter.IsLittleEndian) || |
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66 | (format == SourceFormat.LittleEndian && !BitConverter.IsLittleEndian)) |
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67 | m_shouldReverseOrder = true; |
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68 | } |
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69 | |||
70 | /// <summary> |
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71 | /// Read a 32 bit integer |
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72 | /// </summary> |
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73 | /// <returns>A 32 bit integer in the system's endianness</returns> |
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74 | public override int ReadInt32() |
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75 | { |
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76 | m_a32 = base.ReadBytes(4); |
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77 | if (m_shouldReverseOrder) |
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78 | Array.Reverse(m_a32); |
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79 | return BitConverter.ToInt32(m_a32, 0); |
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80 | } |
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81 | |||
82 | /// <summary> |
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83 | /// Read a 16 bit integer |
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84 | /// </summary> |
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85 | /// <returns>A 16 bit integer in the system's endianness</returns> |
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86 | public override Int16 ReadInt16() |
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87 | { |
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88 | m_a16 = base.ReadBytes(2); |
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89 | if (m_shouldReverseOrder) |
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90 | Array.Reverse(m_a16); |
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91 | return BitConverter.ToInt16(m_a16, 0); |
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92 | } |
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93 | |||
94 | /// <summary> |
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95 | /// Read a 64 bit integer |
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96 | /// </summary> |
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97 | /// <returns>A 64 bit integer in the system's endianness</returns> |
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98 | public override Int64 ReadInt64() |
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99 | { |
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100 | m_a64 = base.ReadBytes(8); |
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101 | if (m_shouldReverseOrder) |
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102 | Array.Reverse(m_a64); |
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103 | return BitConverter.ToInt64(m_a64, 0); |
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104 | } |
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105 | |||
106 | /// <summary> |
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107 | /// Read an unsigned 32 bit integer |
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108 | /// </summary> |
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109 | /// <returns>A 32 bit unsigned integer in the system's endianness</returns> |
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110 | public override UInt32 ReadUInt32() |
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111 | { |
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112 | m_a32 = base.ReadBytes(4); |
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113 | if (m_shouldReverseOrder) |
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114 | Array.Reverse(m_a32); |
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115 | return BitConverter.ToUInt32(m_a32, 0); |
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116 | } |
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117 | |||
118 | /// <summary> |
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119 | /// Read a single precision floating point value |
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120 | /// </summary> |
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121 | /// <returns>A single precision floating point value in the system's endianness</returns> |
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122 | public override float ReadSingle() |
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123 | { |
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124 | m_a32 = base.ReadBytes(4); |
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125 | if (m_shouldReverseOrder) |
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126 | Array.Reverse(m_a32); |
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127 | return BitConverter.ToSingle(m_a32, 0); |
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128 | } |
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129 | |||
130 | /// <summary> |
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131 | /// Read a double precision floating point value |
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132 | /// </summary> |
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133 | /// <returns>A double precision floating point value in the system's endianness</returns> |
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134 | public override double ReadDouble() |
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135 | { |
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136 | m_a64 = base.ReadBytes(8); |
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137 | if (m_shouldReverseOrder) |
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138 | Array.Reverse(m_a64); |
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139 | return BitConverter.ToDouble(m_a64, 0); |
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140 | } |
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141 | |||
142 | /// <summary> |
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143 | /// Read a UTF-8 string |
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144 | /// </summary> |
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145 | /// <returns>A standard system string</returns> |
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146 | public override string ReadString() |
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147 | { |
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148 | using (MemoryStream ms = new MemoryStream()) |
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149 | { |
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150 | byte b = ReadByte(); |
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151 | while (b != 0) |
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152 | { |
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153 | ms.WriteByte(b); |
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154 | b = ReadByte(); |
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155 | } |
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156 | return System.Text.Encoding.UTF8.GetString(ms.GetBuffer(), 0, (int)ms.Position); |
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157 | } |
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158 | } |
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159 | |||
160 | /// <summary> |
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161 | /// Read a UTF-8 string |
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162 | /// </summary> |
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163 | /// <param name="size">length of string to read</param> |
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164 | /// <returns>A standard system string</returns> |
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165 | public string ReadString(int size) |
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166 | { |
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167 | byte[] buffer = ReadBytes(size); |
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168 | return System.Text.Encoding.UTF8.GetString(buffer).Trim(); |
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169 | } |
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170 | } |
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171 | } |