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annotate th_endian.h @ 49:598609fb49b0

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Change how "config.h" is included, etc.
author Matti Hamalainen <ccr@tnsp.org>
date Mon, 03 Oct 2011 15:40:54 +0300
parents a25f5d22483e
children 1607c0691dee
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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 2002-2007 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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10
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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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15 #include <stdio.h>
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16
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17 #ifdef __cplusplus
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18 extern "C" {
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19 #endif
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21
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22 /* Endianess swapping macros
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23 */
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24 #define TH_SWAP_16_LE_BE(value) ((uint16_t) ( \
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25 (uint16_t) ((uint16_t) (value) >> 8) | \
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26 (uint16_t) ((uint16_t) (value) << 8)) )
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27
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29 #define TH_SWAP_32_LE_BE(value) ((uint32_t) ( \
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30 (((uint32_t) (value) & (uint32_t) 0x000000ffU) << 24) | \
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31 (((uint32_t) (value) & (uint32_t) 0x0000ff00U) << 8) | \
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32 (((uint32_t) (value) & (uint32_t) 0x00ff0000U) >> 8) | \
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33 (((uint32_t) (value) & (uint32_t) 0xff000000U) >> 24)))
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34
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35 #ifdef TH_HAVE_64BIT
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36 #define TH_SWAP_64_LE_BE(value) ((uint64_t) ( \
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37 (((uint64_t) (value) & (uint64_t) 0x00000000000000ffULL) << 56) | \
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38 (((uint64_t) (value) & (uint64_t) 0x000000000000ff00ULL) << 40) | \
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39 (((uint64_t) (value) & (uint64_t) 0x0000000000ff0000ULL) << 24) | \
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40 (((uint64_t) (value) & (uint64_t) 0x00000000ff000000ULL) << 8) | \
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41 (((uint64_t) (value) & (uint64_t) 0x000000ff00000000ULL) >> 8) | \
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42 (((uint64_t) (value) & (uint64_t) 0x0000ff0000000000ULL) >> 24) | \
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43 (((uint64_t) (value) & (uint64_t) 0x00ff000000000000ULL) >> 40) | \
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44 (((uint64_t) (value) & (uint64_t) 0xff00000000000000ULL) >> 56)))
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45 #endif
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46
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47 /* Macros that swap only when needed ...
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48 */
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49 #ifdef TH_BIGENDIAN
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50
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51 #define TH_LE16_TO_NATIVE(value) TH_SWAP_16_LE_BE(value)
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52 #define TH_LE32_TO_NATIVE(value) TH_SWAP_32_LE_BE(value)
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53 #define TH_NATIVE_TO_LE16(value) TH_SWAP_16_LE_BE(value)
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54 #define TH_NATIVE_TO_LE32(value) TH_SWAP_32_LE_BE(value)
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55
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56 #define TH_BE16_TO_NATIVE(value) ((uint16_t) (value))
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57 #define TH_BE32_TO_NATIVE(value) ((uint32_t) (value))
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58 #define TH_NATIVE_TO_BE16(value) ((uint16_t) (value))
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59 #define TH_NATIVE_TO_BE32(value) ((uint32_t) (value))
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60
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61 #ifdef TH_HAVE_64BIT
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62 #define TH_LE64_TO_NATIVE(value) TH_SWAP_64_LE_BE(value)
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63 #define TH_NATIVE_TO_LE64(value) TH_SWAP_64_LE_BE(value)
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64 #define TH_BE64_TO_NATIVE(value) ((uint64_t) (value))
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65 #define TH_NATIVE_TO_BE64(value) ((uint64_t) (value))
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66 #endif
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67
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68 #else /* !TH_BIGENDIAN */
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69
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70 #define TH_LE16_TO_NATIVE(value) ((uint16_t) (value))
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71 #define TH_LE32_TO_NATIVE(value) ((uint32_t) (value))
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72 #define TH_NATIVE_TO_LE16(value) ((uint16_t) (value))
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73 #define TH_NATIVE_TO_LE32(value) ((uint32_t) (value))
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74
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75 #define TH_BE16_TO_NATIVE(value) TH_SWAP_16_LE_BE(value)
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76 #define TH_BE32_TO_NATIVE(value) TH_SWAP_32_LE_BE(value)
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77 #define TH_NATIVE_TO_BE16(value) TH_SWAP_16_LE_BE(value)
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78 #define TH_NATIVE_TO_BE32(value) TH_SWAP_32_LE_BE(value)
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79
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80 #ifdef TH_HAVE_64BIT
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81 #define TH_LE64_TO_NATIVE(value) ((uint64_t) (value))
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82 #define TH_NATIVE_TO_LE64(value) ((uint64_t) (value))
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83 #define TH_BE64_TO_NATIVE(value) TH_SWAP_64_LE_BE(value)
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84 #define TH_NATIVE_TO_BE64(value) TH_SWAP_64_LE_BE(value)
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85 #endif
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86
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87 #endif
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88
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89
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90 /* Endian-handling file read/write routines
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91 */
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92 BOOL th_read_str(FILE *f, uint8_t *s, size_t l);
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93 BOOL th_write_str(FILE *f, uint8_t *s, size_t l);
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94
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95 #define TH_DEFINE_HEADER(xname, xtype) \
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96 BOOL th_read_ ## xname (FILE *f, xtype *v); \
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97 BOOL th_write_ ## xname (FILE *f, xtype v);
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98
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99 TH_DEFINE_HEADER(le16, uint16_t)
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100 TH_DEFINE_HEADER(le32, uint32_t)
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101
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102 TH_DEFINE_HEADER(be16, uint16_t)
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103 TH_DEFINE_HEADER(be32, uint32_t)
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104
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105 #ifdef TH_HAVE_64BIT
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106 TH_DEFINE_HEADER(be64, uint64_t)
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107 TH_DEFINE_HEADER(le64, uint64_t)
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108 #endif
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109
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110 #undef TH_DEFINE_HEADER
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111
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112 /* Cause warnings for old functions */
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113 #define TH_READ_LE16 fdksajlkfdsljf lol
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114 #define TH_READ_LE32 fdksajlkfdsljf lol
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115 #define TH_READ_BE16 fdksajlkfdsljf lol
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116 #define TH_READ_BE32 fdksajlkfdsljf lol
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117
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118 #ifdef __cplusplus
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119 }
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120 #endif
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121 #endif /* TH_ENDIAN_H */