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annotate byteordering.h @ 26:292cd17de2a4

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author Matt Johnston <matt@ucc.asn.au>
date Wed, 26 Jun 2013 22:00:08 +0800
parents 5f9a40d6991b
children
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1
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2 /*
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3 * Copyright (c) 2006-2012 by Roland Riegel <[email protected]>
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4 *
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5 * This file is free software; you can redistribute it and/or modify
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6 * it under the terms of either the GNU General Public License version 2
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7 * or the GNU Lesser General Public License version 2.1, both as
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8 * published by the Free Software Foundation.
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9 */
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10
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11 #ifndef BYTEORDERING_H
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12 #define BYTEORDERING_H
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13
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14 #include <stdint.h>
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15
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16 #ifdef __cplusplus
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17 extern "C"
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18 {
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19 #endif
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20
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21 /**
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22 * \addtogroup byteordering
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23 *
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24 * @{
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25 */
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26 /**
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27 * \file
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28 * Byte-order handling header (license: GPLv2 or LGPLv2.1)
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29 *
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30 * \author Roland Riegel
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31 */
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32
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33 #define SWAP16(val) ((((uint16_t) (val)) << 8) | \
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34 (((uint16_t) (val)) >> 8) \
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35 )
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36 #define SWAP32(val) (((((uint32_t) (val)) & 0x000000ff) << 24) | \
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37 ((((uint32_t) (val)) & 0x0000ff00) << 8) | \
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38 ((((uint32_t) (val)) & 0x00ff0000) >> 8) | \
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39 ((((uint32_t) (val)) & 0xff000000) >> 24) \
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40 )
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41
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42 #if LITTLE_ENDIAN || __AVR__
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43 #define SWAP_NEEDED 0
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44 #elif BIG_ENDIAN
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45 #define SWAP_NEEDED 1
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46 #else
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47 #error "Endianess undefined! Please define LITTLE_ENDIAN=1 or BIG_ENDIAN=1."
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48 #endif
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49
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50 /**
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51 * \def HTOL16(val)
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52 *
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53 * Converts a 16-bit integer from host byte order to little-endian byte order.
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54 *
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55 * Use this macro for compile time constants only. For variable values
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56 * use the function htol16() instead. This saves code size.
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57 *
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58 * \param[in] val A 16-bit integer in host byte order.
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59 * \returns The given 16-bit integer converted to little-endian byte order.
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60 */
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61 /**
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62 * \def HTOL32(val)
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63 *
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64 * Converts a 32-bit integer from host byte order to little-endian byte order.
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65 *
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66 * Use this macro for compile time constants only. For variable values
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67 * use the function htol32() instead. This saves code size.
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68 *
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69 * \param[in] val A 32-bit integer in host byte order.
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70 * \returns The given 32-bit integer converted to little-endian byte order.
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71 */
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72 /**
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73 * \def LTOH16(val)
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74 *
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75 * Converts a 16-bit integer from little-endian byte order to host byte order.
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76 *
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77 * Use this macro for compile time constants only. For variable values
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78 * use the function ltoh16() instead. This saves code size.
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79 *
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80 * \param[in] val A 16-bit integer in little-endian byte order.
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81 * \returns The given 16-bit integer converted to host byte order.
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82 */
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83 /**
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84 * \def LTOH32(val)
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85 *
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86 * Converts a 32-bit integer from little-endian byte order to host byte order.
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87 *
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88 * Use this macro for compile time constants only. For variable values
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89 * use the function ltoh32() instead. This saves code size.
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90 *
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91 * \param[in] val A 32-bit integer in little-endian byte order.
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92 * \returns The given 32-bit integer converted to host byte order.
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93 */
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94
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95 #if SWAP_NEEDED
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96 #define HTOL16(val) SWAP16(val)
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97 #define HTOL32(val) SWAP32(val)
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98 #define LTOH16(val) SWAP16(val)
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99 #define LTOH32(val) SWAP32(val)
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100 #else
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101 #define HTOL16(val) (val)
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102 #define HTOL32(val) (val)
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103 #define LTOH16(val) (val)
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104 #define LTOH32(val) (val)
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105 #endif
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106
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107 #if DOXYGEN
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108
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109 /**
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110 * Converts a 16-bit integer from host byte order to little-endian byte order.
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111 *
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112 * Use this function on variable values instead of the
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113 * macro HTOL16(). This saves code size.
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114 *
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115 * \param[in] h A 16-bit integer in host byte order.
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116 * \returns The given 16-bit integer converted to little-endian byte order.
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117 */
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118 uint16_t htol16(uint16_t h);
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119
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120 /**
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121 * Converts a 32-bit integer from host byte order to little-endian byte order.
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122 *
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123 * Use this function on variable values instead of the
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124 * macro HTOL32(). This saves code size.
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125 *
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126 * \param[in] h A 32-bit integer in host byte order.
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127 * \returns The given 32-bit integer converted to little-endian byte order.
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128 */
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129 uint32_t htol32(uint32_t h);
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130
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131 /**
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132 * Converts a 16-bit integer from little-endian byte order to host byte order.
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133 *
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134 * Use this function on variable values instead of the
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135 * macro LTOH16(). This saves code size.
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136 *
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137 * \param[in] l A 16-bit integer in little-endian byte order.
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138 * \returns The given 16-bit integer converted to host byte order.
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139 */
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140 uint16_t ltoh16(uint16_t l);
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141
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142 /**
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143 * Converts a 32-bit integer from little-endian byte order to host byte order.
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144 *
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145 * Use this function on variable values instead of the
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146 * macro LTOH32(). This saves code size.
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147 *
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148 * \param[in] l A 32-bit integer in little-endian byte order.
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149 * \returns The given 32-bit integer converted to host byte order.
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150 */
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151 uint32_t ltoh32(uint32_t l);
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152
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153 #elif SWAP_NEEDED
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154
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155 #define htol16(h) swap16(h)
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156 #define htol32(h) swap32(h)
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157 #define ltoh16(l) swap16(l)
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158 #define ltoh32(l) swap32(l)
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159
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160 #else
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161
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162 #define htol16(h) (h)
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163 #define htol32(h) (h)
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164 #define ltoh16(l) (l)
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165 #define ltoh32(l) (l)
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166
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167 #endif
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168
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169 uint16_t read16(const uint8_t* p);
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170 uint32_t read32(const uint8_t* p);
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171 void write16(uint8_t* p, uint16_t i);
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172 void write32(uint8_t* p, uint32_t i);
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173
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174 /**
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175 * @}
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176 */
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177
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178 #if SWAP_NEEDED
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179 uint16_t swap16(uint16_t i);
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180 uint32_t swap32(uint32_t i);
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181 #endif
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182
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183 #ifdef __cplusplus
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184 }
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185 #endif
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186
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187 #endif
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188