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annotate th_endian.h @ 454:347bfd3e017e

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Bump copyright years.
author Matti Hamalainen <ccr@tnsp.org>
date Tue, 02 Jan 2018 22:57:02 +0200
parents 1b3472ba7b23
children e4ce60239d16
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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 2002-2018 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 #ifndef TH_ENDIAN_H
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9 #define TH_ENDIAN_H
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11 #ifdef HAVE_CONFIG_H
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12 # include "config.h"
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13 #endif
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14 #include "th_types.h"
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16 #ifdef __cplusplus
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17 extern "C" {
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18 #endif
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20 /* Check endianess
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21 */
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22 #ifndef TH_BYTEORDER
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23 # error Undefined byteorder (TH_BYTEORDER not set.)
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24 #endif
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25
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26 #define TH_BIG_ENDIAN 1234
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27 #define TH_LITTLE_ENDIAN 4321
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30 /* Endianess swapping macros
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31 */
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32 #define TH_SWAP_16_LE_BE(value) ((uint16_t) ( \
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33 (uint16_t) ((uint16_t) (value) >> 8) | \
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34 (uint16_t) ((uint16_t) (value) << 8)) )
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37 #define TH_SWAP_32_LE_BE(value) ((uint32_t) ( \
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38 (((uint32_t) (value) & (uint32_t) 0x000000ffU) << 24) | \
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39 (((uint32_t) (value) & (uint32_t) 0x0000ff00U) << 8) | \
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40 (((uint32_t) (value) & (uint32_t) 0x00ff0000U) >> 8) | \
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41 (((uint32_t) (value) & (uint32_t) 0xff000000U) >> 24)))
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42
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43 #define TH_SWAP_64_LE_BE(value) ((uint64_t) ( \
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44 (((uint64_t) (value) & (uint64_t) 0x00000000000000ffULL) << 56) | \
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45 (((uint64_t) (value) & (uint64_t) 0x000000000000ff00ULL) << 40) | \
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46 (((uint64_t) (value) & (uint64_t) 0x0000000000ff0000ULL) << 24) | \
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47 (((uint64_t) (value) & (uint64_t) 0x00000000ff000000ULL) << 8) | \
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48 (((uint64_t) (value) & (uint64_t) 0x000000ff00000000ULL) >> 8) | \
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49 (((uint64_t) (value) & (uint64_t) 0x0000ff0000000000ULL) >> 24) | \
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50 (((uint64_t) (value) & (uint64_t) 0x00ff000000000000ULL) >> 40) | \
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51 (((uint64_t) (value) & (uint64_t) 0xff00000000000000ULL) >> 56)))
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54 /* Macros that swap only when needed ...
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55 */
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56 #if (TH_BYTEORDER == TH_BIG_ENDIAN)
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58 #define TH_LE16_TO_NATIVE(value) TH_SWAP_16_LE_BE(value)
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59 #define TH_LE32_TO_NATIVE(value) TH_SWAP_32_LE_BE(value)
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60 #define TH_NATIVE_TO_LE16(value) TH_SWAP_16_LE_BE(value)
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61 #define TH_NATIVE_TO_LE32(value) TH_SWAP_32_LE_BE(value)
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63 #define TH_BE16_TO_NATIVE(value) ((uint16_t) (value))
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64 #define TH_BE32_TO_NATIVE(value) ((uint32_t) (value))
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65 #define TH_NATIVE_TO_BE16(value) ((uint16_t) (value))
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66 #define TH_NATIVE_TO_BE32(value) ((uint32_t) (value))
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68 #define TH_LE64_TO_NATIVE(value) TH_SWAP_64_LE_BE(value)
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69 #define TH_NATIVE_TO_LE64(value) TH_SWAP_64_LE_BE(value)
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70 #define TH_BE64_TO_NATIVE(value) ((uint64_t) (value))
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71 #define TH_NATIVE_TO_BE64(value) ((uint64_t) (value))
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73 // !TH_BIG_ENDIAN
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74 #elif (TH_BYTEORDER == TH_LITTLE_ENDIAN)
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76 #define TH_LE16_TO_NATIVE(value) ((uint16_t) (value))
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77 #define TH_LE32_TO_NATIVE(value) ((uint32_t) (value))
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78 #define TH_NATIVE_TO_LE16(value) ((uint16_t) (value))
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79 #define TH_NATIVE_TO_LE32(value) ((uint32_t) (value))
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81 #define TH_BE16_TO_NATIVE(value) TH_SWAP_16_LE_BE(value)
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82 #define TH_BE32_TO_NATIVE(value) TH_SWAP_32_LE_BE(value)
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83 #define TH_NATIVE_TO_BE16(value) TH_SWAP_16_LE_BE(value)
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84 #define TH_NATIVE_TO_BE32(value) TH_SWAP_32_LE_BE(value)
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86 #define TH_LE64_TO_NATIVE(value) ((uint64_t) (value))
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87 #define TH_NATIVE_TO_LE64(value) ((uint64_t) (value))
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88 #define TH_BE64_TO_NATIVE(value) TH_SWAP_64_LE_BE(value)
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89 #define TH_NATIVE_TO_BE64(value) TH_SWAP_64_LE_BE(value)
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91 #else
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92 # error Unsupported byte order!
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93 #endif
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94
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95 //
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96 // NE = Native Endian, aka same as native
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97 // Provided for completeness
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98 //
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99 #define TH_NE16_TO_NATIVE(value) (value)
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100 #define TH_NE32_TO_NATIVE(value) (value)
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101 #define TH_NE64_TO_NATIVE(value) (value)
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102
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103 #define TH_NATIVE_TO_NE16(value) (value)
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104 #define TH_NATIVE_TO_NE32(value) (value)
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105 #define TH_NATIVE_TO_NE64(value) (value)
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108 #ifdef __cplusplus
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109 }
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110 #endif
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111 #endif // TH_ENDIAN_H