1 endian.h |
1 /*- |
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2 * Copyright (c) 2002 Thomas Moestl <tmm@FreeBSD.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 |
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7 * are met: |
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8 * 1. Redistributions of source code must retain the above copyright |
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9 * notice, this list of conditions and the following disclaimer. |
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10 * 2. Redistributions in binary form must reproduce the above copyright |
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11 * notice, this list of conditions and the following disclaimer in the |
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12 * documentation and/or other materials provided with the distribution. |
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13 * |
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14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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15 * 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 AUTHOR OR CONTRIBUTORS BE LIABLE |
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18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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24 * SUCH DAMAGE. |
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25 * |
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26 * $FreeBSD: src/sys/sys/endian.h,v 1.6 2003/10/15 20:05:57 obrien Exp $ |
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27 */ |
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28 |
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29 #ifndef _SYS_ENDIAN_H_ |
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30 #define _SYS_ENDIAN_H_ |
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31 |
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32 #include <sys/cdefs.h> |
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33 #include <sys/_types.h> |
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34 #include <machine/endian.h> |
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35 |
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36 #ifndef _UINT16_T_DECLARED |
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37 typedef __uint16_t uint16_t; |
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38 #define _UINT16_T_DECLARED |
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39 #endif |
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40 |
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41 #ifndef _UINT32_T_DECLARED |
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42 typedef __uint32_t uint32_t; |
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43 #define _UINT32_T_DECLARED |
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44 #endif |
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45 |
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46 #ifndef _UINT64_T_DECLARED |
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47 typedef __uint64_t uint64_t; |
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48 #define _UINT64_T_DECLARED |
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49 #endif |
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50 |
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51 /* |
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52 * General byte order swapping functions. |
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53 */ |
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54 #define bswap16(x) __bswap16(x) |
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55 #define bswap32(x) __bswap32(x) |
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56 #define bswap64(x) __bswap64(x) |
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57 |
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58 /* |
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59 * Host to big endian, host to little endian, big endian to host, and little |
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60 * endian to host byte order functions as detailed in byteorder(9). |
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61 */ |
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62 #if _BYTE_ORDER == _LITTLE_ENDIAN |
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63 #define htobe16(x) bswap16((x)) |
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64 #define htobe32(x) bswap32((x)) |
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65 #define htobe64(x) bswap64((x)) |
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66 #define htole16(x) ((uint16_t)(x)) |
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67 #define htole32(x) ((uint32_t)(x)) |
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68 #define htole64(x) ((uint64_t)(x)) |
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69 |
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70 #define be16toh(x) bswap16((x)) |
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71 #define be32toh(x) bswap32((x)) |
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72 #define be64toh(x) bswap64((x)) |
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73 #define le16toh(x) ((uint16_t)(x)) |
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74 #define le32toh(x) ((uint32_t)(x)) |
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75 #define le64toh(x) ((uint64_t)(x)) |
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76 #else /* _BYTE_ORDER != _LITTLE_ENDIAN */ |
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77 #define htobe16(x) ((uint16_t)(x)) |
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78 #define htobe32(x) ((uint32_t)(x)) |
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79 #define htobe64(x) ((uint64_t)(x)) |
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80 #define htole16(x) bswap16((x)) |
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81 #define htole32(x) bswap32((x)) |
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82 #define htole64(x) bswap64((x)) |
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83 |
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84 #define be16toh(x) ((uint16_t)(x)) |
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85 #define be32toh(x) ((uint32_t)(x)) |
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86 #define be64toh(x) ((uint64_t)(x)) |
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87 #define le16toh(x) bswap16((x)) |
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88 #define le32toh(x) bswap32((x)) |
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89 #define le64toh(x) bswap64((x)) |
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90 #endif /* _BYTE_ORDER == _LITTLE_ENDIAN */ |
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91 |
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92 /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */ |
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93 |
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94 static __inline uint16_t |
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95 be16dec(const void *pp) |
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96 { |
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97 unsigned char const *p = (unsigned char const *)pp; |
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98 |
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99 return ((p[0] << 8) | p[1]); |
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100 } |
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101 |
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102 static __inline uint32_t |
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103 be32dec(const void *pp) |
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104 { |
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105 unsigned char const *p = (unsigned char const *)pp; |
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106 |
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107 return ((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]); |
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108 } |
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109 |
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110 static __inline uint64_t |
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111 be64dec(const void *pp) |
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112 { |
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113 unsigned char const *p = (unsigned char const *)pp; |
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114 |
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115 return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4)); |
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116 } |
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117 |
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118 static __inline uint16_t |
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119 le16dec(const void *pp) |
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120 { |
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121 unsigned char const *p = (unsigned char const *)pp; |
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122 |
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123 return ((p[1] << 8) | p[0]); |
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124 } |
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125 |
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126 static __inline uint32_t |
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127 le32dec(const void *pp) |
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128 { |
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129 unsigned char const *p = (unsigned char const *)pp; |
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130 |
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131 return ((p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]); |
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132 } |
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133 |
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134 static __inline uint64_t |
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135 le64dec(const void *pp) |
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136 { |
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137 unsigned char const *p = (unsigned char const *)pp; |
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138 |
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139 return (((uint64_t)le32dec(p + 4) << 32) | le32dec(p)); |
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140 } |
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141 |
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142 static __inline void |
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143 be16enc(void *pp, uint16_t u) |
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144 { |
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145 unsigned char *p = (unsigned char *)pp; |
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146 |
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147 p[0] = (u >> 8) & 0xff; |
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148 p[1] = u & 0xff; |
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149 } |
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150 |
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151 static __inline void |
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152 be32enc(void *pp, uint32_t u) |
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153 { |
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154 unsigned char *p = (unsigned char *)pp; |
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155 |
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156 p[0] = (u >> 24) & 0xff; |
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157 p[1] = (u >> 16) & 0xff; |
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158 p[2] = (u >> 8) & 0xff; |
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159 p[3] = u & 0xff; |
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160 } |
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161 |
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162 static __inline void |
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163 be64enc(void *pp, uint64_t u) |
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164 { |
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165 unsigned char *p = (unsigned char *)pp; |
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166 |
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167 be32enc(p, u >> 32); |
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168 be32enc(p + 4, u & 0xffffffff); |
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169 } |
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170 |
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171 static __inline void |
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172 le16enc(void *pp, uint16_t u) |
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173 { |
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174 unsigned char *p = (unsigned char *)pp; |
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175 |
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176 p[0] = u & 0xff; |
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177 p[1] = (u >> 8) & 0xff; |
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178 } |
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179 |
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180 static __inline void |
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181 le32enc(void *pp, uint32_t u) |
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182 { |
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183 unsigned char *p = (unsigned char *)pp; |
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184 |
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185 p[0] = u & 0xff; |
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186 p[1] = (u >> 8) & 0xff; |
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187 p[2] = (u >> 16) & 0xff; |
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188 p[3] = (u >> 24) & 0xff; |
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189 } |
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190 |
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191 static __inline void |
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192 le64enc(void *pp, uint64_t u) |
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193 { |
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194 unsigned char *p = (unsigned char *)pp; |
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195 |
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196 le32enc(p, u & 0xffffffff); |
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197 le32enc(p + 4, u >> 32); |
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198 } |
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199 |
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200 #endif /* _SYS_ENDIAN_H_ */ |