Mercurial > hg > th-libs
annotate th_endian.h @ 200:d80916aada78
Cosmetic.
author | Matti Hamalainen <ccr@tnsp.org> |
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date | Thu, 11 Feb 2016 21:24:05 +0200 |
parents | 5c7de25666e7 |
children | e6a278f140c4 |
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1 /* |
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2 * Endianess handling |
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3 * Programmed and designed by Matti 'ccr' Hamalainen |
144 | 4 * (C) Copyright 2002-2015 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 |
180 | 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 |
5 | 17 #ifdef __cplusplus |
18 extern "C" { | |
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19 #endif |
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20 |
52 | 21 /* Check endianess |
22 */ | |
23 #ifndef TH_BYTEORDER | |
24 # error Undefined byteorder (TH_BYTEORDER not set.) | |
25 #endif | |
26 | |
27 #define TH_BIG_ENDIAN 1234 | |
28 #define TH_LITTLE_ENDIAN 4321 | |
29 | |
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30 |
5 | 31 /* Endianess swapping macros |
32 */ | |
10 | 33 #define TH_SWAP_16_LE_BE(value) ((uint16_t) ( \ |
5 | 34 (uint16_t) ((uint16_t) (value) >> 8) | \ |
35 (uint16_t) ((uint16_t) (value) << 8)) ) | |
36 | |
37 | |
38 #define TH_SWAP_32_LE_BE(value) ((uint32_t) ( \ | |
39 (((uint32_t) (value) & (uint32_t) 0x000000ffU) << 24) | \ | |
40 (((uint32_t) (value) & (uint32_t) 0x0000ff00U) << 8) | \ | |
41 (((uint32_t) (value) & (uint32_t) 0x00ff0000U) >> 8) | \ | |
42 (((uint32_t) (value) & (uint32_t) 0xff000000U) >> 24))) | |
43 | |
44 #ifdef TH_HAVE_64BIT | |
45 #define TH_SWAP_64_LE_BE(value) ((uint64_t) ( \ | |
46 (((uint64_t) (value) & (uint64_t) 0x00000000000000ffULL) << 56) | \ | |
47 (((uint64_t) (value) & (uint64_t) 0x000000000000ff00ULL) << 40) | \ | |
48 (((uint64_t) (value) & (uint64_t) 0x0000000000ff0000ULL) << 24) | \ | |
49 (((uint64_t) (value) & (uint64_t) 0x00000000ff000000ULL) << 8) | \ | |
50 (((uint64_t) (value) & (uint64_t) 0x000000ff00000000ULL) >> 8) | \ | |
51 (((uint64_t) (value) & (uint64_t) 0x0000ff0000000000ULL) >> 24) | \ | |
52 (((uint64_t) (value) & (uint64_t) 0x00ff000000000000ULL) >> 40) | \ | |
53 (((uint64_t) (value) & (uint64_t) 0xff00000000000000ULL) >> 56))) | |
54 #endif | |
55 | |
56 /* Macros that swap only when needed ... | |
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57 */ |
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58 #if (TH_BYTEORDER == TH_BIG_ENDIAN) |
5 | 59 |
60 #define TH_LE16_TO_NATIVE(value) TH_SWAP_16_LE_BE(value) | |
61 #define TH_LE32_TO_NATIVE(value) TH_SWAP_32_LE_BE(value) | |
62 #define TH_NATIVE_TO_LE16(value) TH_SWAP_16_LE_BE(value) | |
63 #define TH_NATIVE_TO_LE32(value) TH_SWAP_32_LE_BE(value) | |
64 | |
65 #define TH_BE16_TO_NATIVE(value) ((uint16_t) (value)) | |
66 #define TH_BE32_TO_NATIVE(value) ((uint32_t) (value)) | |
67 #define TH_NATIVE_TO_BE16(value) ((uint16_t) (value)) | |
68 #define TH_NATIVE_TO_BE32(value) ((uint32_t) (value)) | |
69 | |
70 #ifdef TH_HAVE_64BIT | |
71 #define TH_LE64_TO_NATIVE(value) TH_SWAP_64_LE_BE(value) | |
72 #define TH_NATIVE_TO_LE64(value) TH_SWAP_64_LE_BE(value) | |
73 #define TH_BE64_TO_NATIVE(value) ((uint64_t) (value)) | |
74 #define TH_NATIVE_TO_BE64(value) ((uint64_t) (value)) | |
75 #endif | |
76 | |
129 | 77 // !TH_BIG_ENDIAN |
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78 #elif (TH_BYTEORDER == TH_LITTLE_ENDIAN) |
5 | 79 |
80 #define TH_LE16_TO_NATIVE(value) ((uint16_t) (value)) | |
81 #define TH_LE32_TO_NATIVE(value) ((uint32_t) (value)) | |
82 #define TH_NATIVE_TO_LE16(value) ((uint16_t) (value)) | |
83 #define TH_NATIVE_TO_LE32(value) ((uint32_t) (value)) | |
84 | |
85 #define TH_BE16_TO_NATIVE(value) TH_SWAP_16_LE_BE(value) | |
86 #define TH_BE32_TO_NATIVE(value) TH_SWAP_32_LE_BE(value) | |
87 #define TH_NATIVE_TO_BE16(value) TH_SWAP_16_LE_BE(value) | |
88 #define TH_NATIVE_TO_BE32(value) TH_SWAP_32_LE_BE(value) | |
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89 |
5 | 90 #ifdef TH_HAVE_64BIT |
91 #define TH_LE64_TO_NATIVE(value) ((uint64_t) (value)) | |
92 #define TH_NATIVE_TO_LE64(value) ((uint64_t) (value)) | |
93 #define TH_BE64_TO_NATIVE(value) TH_SWAP_64_LE_BE(value) | |
94 #define TH_NATIVE_TO_BE64(value) TH_SWAP_64_LE_BE(value) | |
95 #endif | |
96 | |
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97 #else |
200 | 98 # error Unsupported byte order! |
5 | 99 #endif |
100 | |
101 | |
102 /* Endian-handling file read/write routines | |
103 */ | |
104 #define TH_DEFINE_HEADER(xname, xtype) \ | |
134 | 105 BOOL th_fread_ ## xname (FILE *f, xtype *v); \ |
106 BOOL th_fwrite_ ## xname (FILE *f, xtype v); | |
5 | 107 |
108 TH_DEFINE_HEADER(le16, uint16_t) | |
109 TH_DEFINE_HEADER(le32, uint32_t) | |
110 | |
111 TH_DEFINE_HEADER(be16, uint16_t) | |
112 TH_DEFINE_HEADER(be32, uint32_t) | |
113 | |
114 TH_DEFINE_HEADER(be64, uint64_t) | |
115 TH_DEFINE_HEADER(le64, uint64_t) | |
116 | |
117 #undef TH_DEFINE_HEADER | |
118 | |
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119 #ifdef __cplusplus |
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120 } |
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121 #endif |
129 | 122 #endif // TH_ENDIAN_H |