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annotate src/lib/byteorder.h @ 22664:fea53c2725c0

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director: Fix director_max_parallel_moves/kicks type Should be uint, not time.
author Timo Sirainen <timo.sirainen@dovecot.fi>
date Thu, 09 Nov 2017 12:24:16 +0200
parents 57b5452d4528
children 639251a1d58e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (c) 2016-2017 Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
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3 *
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4 * Permission is hereby granted, free of charge, to any person obtaining a copy
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5 * of this software and associated documentation files (the "Software"), to deal
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6 * in the Software without restriction, including without limitation the rights
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7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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8 * copies of the Software, and to permit persons to whom the Software is
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9 * furnished to do so, subject to the following conditions:
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10 *
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11 * The above copyright notice and this permission notice shall be included in
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12 * all copies or substantial portions of the Software.
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13 *
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14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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20 * SOFTWARE.
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21 */
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22
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23 #ifndef BYTEORDER_H
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24 #define BYTEORDER_H
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25
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26 /*
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27 * These prototypes exist to catch bugs in the code generating macros below.
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28 */
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29 /* return byte swapped input */
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30 static inline uint64_t bswap_64(uint64_t in);
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31 static inline uint32_t bswap_32(uint32_t in);
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32 static inline uint16_t bswap_16(uint16_t in);
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33 static inline uint8_t bswap_8(uint8_t in);
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34
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35 /* load an unaligned cpu native endian number from memory */
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36 static inline uint64_t cpu64_to_cpu_unaligned(const void *in);
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37 static inline uint32_t cpu32_to_cpu_unaligned(const void *in);
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38 static inline uint16_t cpu16_to_cpu_unaligned(const void *in);
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39 static inline uint8_t cpu8_to_cpu_unaligned(const void *in);
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40
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41 /* load an unaligned big endian number from memory */
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42 static inline uint64_t be64_to_cpu_unaligned(const void *in);
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43 static inline uint32_t be32_to_cpu_unaligned(const void *in);
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44 static inline uint16_t be16_to_cpu_unaligned(const void *in);
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45 static inline uint8_t be8_to_cpu_unaligned(const void *in);
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46
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47 /* load an unaligned little endian number from memory */
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48 static inline uint64_t le64_to_cpu_unaligned(const void *in);
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49 static inline uint32_t le32_to_cpu_unaligned(const void *in);
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50 static inline uint16_t le16_to_cpu_unaligned(const void *in);
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51 static inline uint8_t le8_to_cpu_unaligned(const void *in);
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52
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53 /* store into memory a cpu native endian number as a big endian number */
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54 static inline void cpu64_to_be_unaligned(uint64_t in, void *out);
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55 static inline void cpu32_to_be_unaligned(uint32_t in, void *out);
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56 static inline void cpu16_to_be_unaligned(uint16_t in, void *out);
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57 static inline void cpu8_to_be_unaligned(uint8_t in, void *out);
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58
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59 /* store into memory a cpu native endian number as a little endian number */
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60 static inline void cpu64_to_le_unaligned(uint64_t in, void *out);
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61 static inline void cpu32_to_le_unaligned(uint32_t in, void *out);
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62 static inline void cpu16_to_le_unaligned(uint16_t in, void *out);
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63 static inline void cpu8_to_le_unaligned(uint8_t in, void *out);
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64
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65 /* convert a big endian input into cpu native endian */
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66 static inline uint64_t be64_to_cpu(uint64_t in);
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67 static inline uint32_t be32_to_cpu(uint32_t in);
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68 static inline uint16_t be16_to_cpu(uint16_t in);
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69 static inline uint8_t be8_to_cpu(uint8_t in);
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70
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71 /* convert a cpu native endian input into big endian */
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72 static inline uint64_t cpu64_to_be(uint64_t in);
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73 static inline uint32_t cpu32_to_be(uint32_t in);
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74 static inline uint16_t cpu16_to_be(uint16_t in);
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75 static inline uint8_t cpu8_to_be(uint8_t in);
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76
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77 /* convert a little endian input into cpu native endian */
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78 static inline uint64_t le64_to_cpu(uint64_t in);
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79 static inline uint32_t le32_to_cpu(uint32_t in);
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80 static inline uint16_t le16_to_cpu(uint16_t in);
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81 static inline uint8_t le8_to_cpu(uint8_t in);
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82
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83 /* convert a cpu native endian input into little endian */
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84 static inline uint64_t cpu64_to_le(uint64_t in);
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85 static inline uint32_t cpu32_to_le(uint32_t in);
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86 static inline uint16_t cpu16_to_le(uint16_t in);
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87 static inline uint8_t cpu8_to_le(uint8_t in);
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88
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89 /*
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90 * byte swapping
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91 */
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92 static inline uint64_t bswap_64(uint64_t in)
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93 {
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94 return ((in & 0xff00000000000000ULL) >> 56) |
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95 ((in & 0x00ff000000000000ULL) >> 40) |
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96 ((in & 0x0000ff0000000000ULL) >> 24) |
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97 ((in & 0x000000ff00000000ULL) >> 8) |
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98 ((in & 0x00000000ff000000ULL) << 8) |
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99 ((in & 0x0000000000ff0000ULL) << 24) |
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100 ((in & 0x000000000000ff00ULL) << 40) |
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101 ((in & 0x00000000000000ffULL) << 56);
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102 }
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103
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104 static inline uint32_t bswap_32(uint32_t in)
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105 {
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106 return ((in & 0xff000000) >> 24) |
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107 ((in & 0x00ff0000) >> 8) |
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108 ((in & 0x0000ff00) << 8) |
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109 ((in & 0x000000ff) << 24);
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110 }
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111
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112 static inline uint16_t bswap_16(uint16_t in)
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113 {
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114 return ((in & 0xff00) >> 8) |
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115 ((in & 0x00ff) << 8);
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116 }
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117
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118 static inline uint8_t bswap_8(uint8_t in)
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119 {
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120 return (in & 0xff);
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121 }
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122
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123 /*
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124 * unaligned big-endian integer
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125 */
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126 static inline uint64_t be64_to_cpu_unaligned(const void *in)
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127 {
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128 const uint8_t *p = (const uint8_t *) in;
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129
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130 return (((uint64_t) p[0] << 56) |
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131 ((uint64_t) p[1] << 48) |
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132 ((uint64_t) p[2] << 40) |
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133 ((uint64_t) p[3] << 32) |
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134 ((uint64_t) p[4] << 24) |
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135 ((uint64_t) p[5] << 16) |
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136 ((uint64_t) p[6] << 8) |
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137 ((uint64_t) p[7]));
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138 }
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139
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140 static inline void cpu64_to_be_unaligned(uint64_t in, void *out)
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141 {
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142 uint8_t *p = (uint8_t *) out;
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143
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144 p[0] = (in >> 56) & 0xff;
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145 p[1] = (in >> 48) & 0xff;
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146 p[2] = (in >> 40) & 0xff;
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147 p[3] = (in >> 32) & 0xff;
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148 p[4] = (in >> 24) & 0xff;
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149 p[5] = (in >> 16) & 0xff;
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150 p[6] = (in >> 8) & 0xff;
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151 p[7] = in & 0xff;
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152 }
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153
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154 static inline uint32_t be32_to_cpu_unaligned(const void *in)
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155 {
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156 const uint8_t *p = (const uint8_t *) in;
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157
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158 return (((uint32_t) p[0] << 24) |
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159 ((uint32_t) p[1] << 16) |
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160 ((uint32_t) p[2] << 8) |
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161 ((uint32_t) p[3]));
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162 }
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163
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164 static inline void cpu32_to_be_unaligned(uint32_t in, void *out)
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165 {
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166 uint8_t *p = (uint8_t *) out;
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167
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168 p[0] = (in >> 24) & 0xff;
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169 p[1] = (in >> 16) & 0xff;
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170 p[2] = (in >> 8) & 0xff;
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171 p[3] = in & 0xff;
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172 }
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173
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174 static inline uint16_t be16_to_cpu_unaligned(const void *in)
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175 {
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176 const uint8_t *p = (const uint8_t *) in;
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177
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178 return (((uint16_t) p[0] << 8) |
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179 ((uint16_t) p[1]));
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180 }
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181
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182 static inline void cpu16_to_be_unaligned(uint16_t in, void *out)
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183 {
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184 uint8_t *p = (uint8_t *) out;
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185
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186 p[0] = (in >> 8) & 0xff;
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187 p[1] = in & 0xff;
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188 }
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189
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190 static inline uint8_t be8_to_cpu_unaligned(const void *in)
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191 {
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192 return *((const uint8_t *) in);
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193 }
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194
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195 static inline void cpu8_to_be_unaligned(uint8_t in, void *out)
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196 {
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197 uint8_t *p = (uint8_t *) out;
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198
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199 *p = in;
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200 }
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201
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202 /*
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203 * unaligned little-endian & cpu-endian integers
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204 */
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205 #define __GEN(size, bswap) \
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206 static inline uint##size##_t le##size##_to_cpu_unaligned(const void *in)\
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207 { \
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208 uint##size##_t x = be##size##_to_cpu_unaligned(in); \
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209 /* we read a LE int as BE, so we always have to byte swap */ \
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210 return bswap_##size(x); \
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211 } \
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212 static inline void cpu##size##_to_le_unaligned(uint##size##_t in, \
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213 void *out) \
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214 { \
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215 /* we'll be writing in BE, so we always have to byte swap */ \
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216 cpu##size##_to_be_unaligned(bswap_##size(in), out); \
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217 } \
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218 static inline uint##size##_t cpu##size##_to_cpu_unaligned(const void *in)\
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219 { \
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220 uint##size##_t x = be##size##_to_cpu_unaligned(in); \
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221 return bswap; \
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222 }
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223
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224 #if WORDS_BIGENDIAN
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225 #define GEN(size) __GEN(size, x)
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226 #else
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227 #define GEN(size) __GEN(size, bswap_##size(x))
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228 #endif
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229
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230 GEN(64)
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231 GEN(32)
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232 GEN(16)
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233 GEN(8)
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234
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235 #undef __GEN
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236 #undef GEN
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237
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238 /*
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239 * byte ordering
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240 */
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241 #define ___GEN(from, size, to, bswap) \
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242 static inline uint##size##_t from##size##_to_##to(uint##size##_t x) \
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243 { \
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244 return bswap; \
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245 }
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246
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247 #if WORDS_BIGENDIAN
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248 #define __GEN(from, size, to, be, le) ___GEN(from, size, to, be)
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249 #else
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250 #define __GEN(from, size, to, be, le) ___GEN(from, size, to, le)
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251 #endif
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252
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253 #define GEN(size) \
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254 __GEN(be, size, cpu, x, bswap_##size(x)) \
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255 __GEN(cpu, size, be, x, bswap_##size(x)) \
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256 __GEN(le, size, cpu, bswap_##size(x), x) \
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257 __GEN(cpu, size, le, bswap_##size(x), x)
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258
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259 GEN(64)
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260 GEN(32)
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261 GEN(16)
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262 GEN(8)
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263
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264 #undef ___GEN
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265 #undef __GEN
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266 #undef GEN
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267
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268 #endif