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annotate th_endian.h @ 726:29e44a58bc73

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Bump copyrights.
author Matti Hamalainen <ccr@tnsp.org>
date Sat, 01 Jan 2022 16:17:31 +0200
parents 4ca6a3b30fe8
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1 /*
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2 * Endianess handling
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3 * Programmed and designed by Matti 'ccr' Hamalainen
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4 * (C) Copyright 2002-2022 Tecnic Software productions (TNSP)
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5 *
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6 * Please read file 'COPYING' for information on license and distribution.
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7 */
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8 /// @file
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9 /// @brief Endianess handling functionality for data type conversions, etc.
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10 #ifndef TH_ENDIAN_H
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11 #define TH_ENDIAN_H
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12
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13 #ifdef HAVE_CONFIG_H
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14 # include "config.h"
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15 #endif
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16 #include "th_types.h"
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17
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18 #ifdef __cplusplus
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19 extern "C" {
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20 #endif
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21
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22 /* Check endianess
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23 */
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24 #ifndef TH_BYTEORDER
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25 # error Undefined byteorder (TH_BYTEORDER not set.)
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26 #endif
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27
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28 #define TH_BIG_ENDIAN 1234
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29 #define TH_LITTLE_ENDIAN 4321
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31
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32 /* Endianess swapping macros
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33 */
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34 #define TH_SWAP_16_LE_BE(value) ((uint16_t) ( \
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35 (uint16_t) ((uint16_t) (value) >> 8) | \
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36 (uint16_t) ((uint16_t) (value) << 8)) )
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38
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39 #define TH_SWAP_32_LE_BE(value) ((uint32_t) ( \
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40 (((uint32_t) (value) & (uint32_t) 0x000000ffU) << 24) | \
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41 (((uint32_t) (value) & (uint32_t) 0x0000ff00U) << 8) | \
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42 (((uint32_t) (value) & (uint32_t) 0x00ff0000U) >> 8) | \
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43 (((uint32_t) (value) & (uint32_t) 0xff000000U) >> 24)))
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44
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45 #define TH_SWAP_64_LE_BE(value) ((uint64_t) ( \
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46 (((uint64_t) (value) & (uint64_t) 0x00000000000000ffULL) << 56) | \
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47 (((uint64_t) (value) & (uint64_t) 0x000000000000ff00ULL) << 40) | \
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48 (((uint64_t) (value) & (uint64_t) 0x0000000000ff0000ULL) << 24) | \
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49 (((uint64_t) (value) & (uint64_t) 0x00000000ff000000ULL) << 8) | \
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50 (((uint64_t) (value) & (uint64_t) 0x000000ff00000000ULL) >> 8) | \
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51 (((uint64_t) (value) & (uint64_t) 0x0000ff0000000000ULL) >> 24) | \
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52 (((uint64_t) (value) & (uint64_t) 0x00ff000000000000ULL) >> 40) | \
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53 (((uint64_t) (value) & (uint64_t) 0xff00000000000000ULL) >> 56)))
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54
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56 /* Macros that swap only when needed ...
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57 */
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58 #if (TH_BYTEORDER == TH_BIG_ENDIAN)
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59
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60 #define TH_LE16_TO_NATIVE(value) TH_SWAP_16_LE_BE(value)
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61 #define TH_LE32_TO_NATIVE(value) TH_SWAP_32_LE_BE(value)
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62 #define TH_NATIVE_TO_LE16(value) TH_SWAP_16_LE_BE(value)
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63 #define TH_NATIVE_TO_LE32(value) TH_SWAP_32_LE_BE(value)
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64
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65 #define TH_BE16_TO_NATIVE(value) ((uint16_t) (value))
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66 #define TH_BE32_TO_NATIVE(value) ((uint32_t) (value))
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67 #define TH_NATIVE_TO_BE16(value) ((uint16_t) (value))
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68 #define TH_NATIVE_TO_BE32(value) ((uint32_t) (value))
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69
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70 #define TH_LE64_TO_NATIVE(value) TH_SWAP_64_LE_BE(value)
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71 #define TH_NATIVE_TO_LE64(value) TH_SWAP_64_LE_BE(value)
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72 #define TH_BE64_TO_NATIVE(value) ((uint64_t) (value))
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73 #define TH_NATIVE_TO_BE64(value) ((uint64_t) (value))
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75 // !TH_BIG_ENDIAN
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76 #elif (TH_BYTEORDER == TH_LITTLE_ENDIAN)
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78 #define TH_LE16_TO_NATIVE(value) ((uint16_t) (value))
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79 #define TH_LE32_TO_NATIVE(value) ((uint32_t) (value))
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80 #define TH_NATIVE_TO_LE16(value) ((uint16_t) (value))
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81 #define TH_NATIVE_TO_LE32(value) ((uint32_t) (value))
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82
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83 #define TH_BE16_TO_NATIVE(value) TH_SWAP_16_LE_BE(value)
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84 #define TH_BE32_TO_NATIVE(value) TH_SWAP_32_LE_BE(value)
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85 #define TH_NATIVE_TO_BE16(value) TH_SWAP_16_LE_BE(value)
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86 #define TH_NATIVE_TO_BE32(value) TH_SWAP_32_LE_BE(value)
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88 #define TH_LE64_TO_NATIVE(value) ((uint64_t) (value))
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89 #define TH_NATIVE_TO_LE64(value) ((uint64_t) (value))
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90 #define TH_BE64_TO_NATIVE(value) TH_SWAP_64_LE_BE(value)
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91 #define TH_NATIVE_TO_BE64(value) TH_SWAP_64_LE_BE(value)
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92
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93 #else
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94 # error Unsupported byte order!
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95 #endif
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96
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97 //
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98 // NE = Native Endian, aka same as native
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99 // Provided for completeness
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100 //
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101 #define TH_NE16_TO_NATIVE(value) (value)
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102 #define TH_NE32_TO_NATIVE(value) (value)
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103 #define TH_NE64_TO_NATIVE(value) (value)
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104
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105 #define TH_NATIVE_TO_NE16(value) (value)
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106 #define TH_NATIVE_TO_NE32(value) (value)
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107 #define TH_NATIVE_TO_NE64(value) (value)
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108
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109
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110 #ifdef __cplusplus
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111 }
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112 #endif
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113 #endif // TH_ENDIAN_H