1 | /* |
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2 | * ====================================================================== |
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3 | * Rappture::SerialBuffer |
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4 | * |
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5 | * AUTHOR: Michael McLennan, Purdue University |
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6 | * Carol X Song, Purdue University |
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7 | * |
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8 | * Copyright (c) 2004-2012 HUBzero Foundation, LLC |
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9 | * ---------------------------------------------------------------------- |
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10 | * See the file "license.terms" for information on usage and |
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11 | * redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES. |
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12 | * ====================================================================== |
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13 | */ |
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14 | #include "RpSerialBuffer.h" |
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15 | |
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16 | #ifdef BIGENDIAN |
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17 | # define ENDIAN_FOR_LOOP(var,size) \ |
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18 | for (var=size-1; var >= 0; var--) |
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19 | #else |
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20 | # define ENDIAN_FOR_LOOP(var,size) \ |
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21 | for (var=0; var < size; var++) |
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22 | #endif |
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23 | |
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24 | using namespace Rappture; |
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25 | |
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26 | /** |
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27 | * Construct an empty SerialBuffer. |
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28 | */ |
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29 | SerialBuffer::SerialBuffer() |
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30 | : _buffer(), |
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31 | _pos(0) |
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32 | { |
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33 | } |
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34 | |
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35 | /** |
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36 | * Construct a SerialBuffer loaded with bytes produced by another |
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37 | * SerialBuffer. This is used to decode information from the buffer. |
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38 | * |
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39 | * @param bytes pointer to bytes being decoded. |
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40 | * @param nbytes number of bytes being decoded. |
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41 | */ |
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42 | SerialBuffer::SerialBuffer(const char* bytes, int nbytes) |
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43 | : _buffer(), |
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44 | _pos(0) |
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45 | { |
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46 | _buffer.reserve(nbytes); |
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47 | while (nbytes-- > 0) { |
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48 | _buffer.push_back( *bytes++ ); |
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49 | } |
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50 | } |
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51 | |
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52 | /** |
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53 | * Copy constructor |
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54 | */ |
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55 | SerialBuffer::SerialBuffer(const SerialBuffer& sb) |
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56 | : _buffer(sb._buffer), |
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57 | _pos(0) // auto-rewind |
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58 | { |
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59 | } |
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60 | |
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61 | /** |
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62 | * Assignment operator |
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63 | */ |
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64 | SerialBuffer& |
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65 | SerialBuffer::operator=(const SerialBuffer& sb) |
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66 | { |
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67 | _buffer = sb._buffer; |
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68 | _pos = 0; // auto-rewind |
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69 | return *this; |
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70 | } |
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71 | |
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72 | SerialBuffer::~SerialBuffer() |
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73 | { |
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74 | } |
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75 | |
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76 | /** |
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77 | * Get the bytes currently stored in the buffer. These bytes can |
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78 | * be stored, and used later to construct another SerialBuffer to |
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79 | * decode the information. |
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80 | * |
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81 | * @return Pointer to the bytes in the buffer. |
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82 | */ |
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83 | const char* |
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84 | SerialBuffer::bytes() const |
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85 | { |
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86 | return &_buffer[0]; |
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87 | } |
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88 | |
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89 | /** |
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90 | * Get the number of bytes currently stored in the buffer. |
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91 | * @return Number of the bytes in the buffer. |
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92 | */ |
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93 | int |
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94 | SerialBuffer::size() const |
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95 | { |
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96 | return _buffer.size(); |
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97 | } |
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98 | |
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99 | /** |
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100 | * Clear the buffer, making it empty. |
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101 | */ |
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102 | SerialBuffer& |
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103 | SerialBuffer::clear() |
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104 | { |
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105 | _buffer.clear(); |
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106 | return *this; |
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107 | } |
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108 | |
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109 | SerialBuffer& |
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110 | SerialBuffer::writeChar(char cval) |
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111 | { |
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112 | _buffer.push_back(cval); |
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113 | return *this; |
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114 | } |
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115 | |
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116 | SerialBuffer& |
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117 | SerialBuffer::writeInt(int ival) |
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118 | { |
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119 | char *ptr = (char*)(&ival); |
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120 | unsigned int i = 0; |
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121 | |
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122 | ENDIAN_FOR_LOOP(i, sizeof(int)) { |
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123 | _buffer.push_back(ptr[i]); |
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124 | } |
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125 | return *this; |
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126 | } |
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127 | |
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128 | SerialBuffer& |
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129 | SerialBuffer::writeDouble(double dval) |
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130 | { |
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131 | char *ptr = (char*)(&dval); |
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132 | unsigned int i = 0; |
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133 | |
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134 | ENDIAN_FOR_LOOP(i, sizeof(double)) { |
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135 | _buffer.push_back(ptr[i]); |
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136 | } |
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137 | return *this; |
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138 | } |
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139 | |
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140 | SerialBuffer& |
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141 | SerialBuffer::writeString(const char* sval) |
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142 | { |
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143 | while (*sval != '\0') { |
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144 | _buffer.push_back(*sval++); |
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145 | } |
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146 | _buffer.push_back('\0'); |
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147 | return *this; |
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148 | } |
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149 | |
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150 | SerialBuffer& |
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151 | SerialBuffer::writeBytes(const char* bval, int nbytes) |
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152 | { |
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153 | writeInt(nbytes); |
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154 | while (nbytes-- > 0) { |
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155 | _buffer.push_back(*bval++); |
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156 | } |
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157 | return *this; |
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158 | } |
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159 | |
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160 | void |
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161 | SerialBuffer::rewind() |
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162 | { |
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163 | _pos = 0; |
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164 | } |
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165 | |
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166 | int |
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167 | SerialBuffer::atEnd() const |
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168 | { |
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169 | return ((unsigned int)_pos >= _buffer.size()); |
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170 | } |
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171 | |
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172 | char |
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173 | SerialBuffer::readChar() |
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174 | { |
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175 | char c = '\0'; |
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176 | if ((unsigned int)_pos < _buffer.size()) { |
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177 | c = _buffer[_pos++]; |
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178 | } |
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179 | return c; |
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180 | } |
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181 | |
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182 | int |
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183 | SerialBuffer::readInt() |
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184 | { |
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185 | int ival = 0; |
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186 | char *ptr = (char*)(&ival); |
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187 | unsigned int i = 0; |
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188 | |
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189 | ENDIAN_FOR_LOOP(i, sizeof(int)) { |
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190 | if ((unsigned int)_pos < _buffer.size()) { |
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191 | ptr[i] = _buffer[_pos++]; |
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192 | } |
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193 | } |
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194 | return ival; |
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195 | } |
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196 | |
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197 | double |
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198 | SerialBuffer::readDouble() |
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199 | { |
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200 | double dval = 0; |
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201 | char *ptr = (char*)(&dval); |
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202 | unsigned int i = 0; |
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203 | |
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204 | ENDIAN_FOR_LOOP(i, sizeof(double)) { |
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205 | if ((unsigned int)_pos < _buffer.size()) { |
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206 | ptr[i] = _buffer[_pos++]; |
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207 | } |
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208 | } |
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209 | return dval; |
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210 | } |
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211 | |
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212 | std::string |
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213 | SerialBuffer::readString() |
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214 | { |
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215 | std::string sval; |
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216 | char c; |
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217 | while ((unsigned int)_pos < _buffer.size()) { |
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218 | c = _buffer[_pos++]; |
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219 | if (c == '\0') { |
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220 | break; |
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221 | } else { |
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222 | sval.push_back(c); |
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223 | } |
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224 | } |
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225 | return sval; |
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226 | } |
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227 | |
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228 | std::vector<char> |
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229 | SerialBuffer::readBytes() |
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230 | { |
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231 | int nbytes; |
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232 | std::vector<char> bval; |
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233 | |
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234 | nbytes = readInt(); |
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235 | while ((unsigned int)_pos < _buffer.size() && nbytes-- > 0) { |
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236 | bval.push_back( _buffer[_pos++] ); |
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237 | } |
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238 | return bval; |
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239 | } |
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