libutil
C Utility Library
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libutil/src/endian.h (135 lines, 4.6 KiB) -rw-r--r-- file download
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// util/endian.h, version 1.0.2
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// Endian header file from libutil
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// Copyright (C) 2021, Jakob Wakeling
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// MIT Licence
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#ifndef UTIL_ENDIAN_H_G7AID2RQ
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#define UTIL_ENDIAN_H_G7AID2RQ
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdint.h>
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/* Byte swap a 16-bit integer */
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#define BSWAP16(x) ( \
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	(((uint16_t)(x) & 0xFF00u) >> 8) | \
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	(((uint16_t)(x) & 0x00FFu) << 8))
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/* Byte swap a 32-bit integer */
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#define BSWAP32(x) ( \
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	(((uint32_t)(x) & 0xFF000000uL) >> 24) | \
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	(((uint32_t)(x) & 0x00FF0000uL) >>  8) | \
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	(((uint32_t)(x) & 0x0000FF00uL) <<  8) | \
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	(((uint32_t)(x) & 0x000000FFuL) << 24))
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/* Byte swap a 64-bit integer */
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#define BSWAP64(x) ( \
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	(((uint64_t)(x) & 0xFF00000000000000uLL) >> 56) | \
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	(((uint64_t)(x) & 0x00FF000000000000uLL) >> 40) | \
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	(((uint64_t)(x) & 0x0000FF0000000000uLL) >> 24) | \
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	(((uint64_t)(x) & 0x000000FF00000000uLL) >>  8) | \
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	(((uint64_t)(x) & 0x00000000FF000000uLL) <<  8) | \
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	(((uint64_t)(x) & 0x0000000000FF0000uLL) << 24) | \
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	(((uint64_t)(x) & 0x000000000000FF00uLL) << 40) | \
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	(((uint64_t)(x) & 0x00000000000000FFuLL) << 56))
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/* Load a 16-bit little endian integer */
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#define LD16LE(p) ( \
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	((uint16_t)(((uint8_t *)(p))[0]) << 0) | \
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	((uint16_t)(((uint8_t *)(p))[1]) << 8))
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/* Load a 16-bit big endian integer */
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#define LD16BE(p) ( \
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	((uint16_t)(((uint8_t *)(p))[0]) << 8) | \
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	((uint16_t)(((uint8_t *)(p))[1]) << 0))
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/* Load a 32-bit little endian integer */
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#define LD32LE(p) ( \
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	((uint32_t)(((uint8_t *)(p))[0]) <<  0) | \
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	((uint32_t)(((uint8_t *)(p))[1]) <<  8) | \
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	((uint32_t)(((uint8_t *)(p))[2]) << 16) | \
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	((uint32_t)(((uint8_t *)(p))[3]) << 24))
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/* Load a 32-bit big endian integer */
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#define LD32BE(p) ( \
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	((uint32_t)(((uint8_t *)(p))[0]) << 24) | \
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	((uint32_t)(((uint8_t *)(p))[1]) << 16) | \
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	((uint32_t)(((uint8_t *)(p))[2]) <<  8) | \
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	((uint32_t)(((uint8_t *)(p))[3]) <<  0))
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/* Load a 64-bit little endian integer */
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#define LD64LE(p) ( \
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	((uint64_t)(((uint8_t *)(p))[0]) <<  0) | \
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	((uint64_t)(((uint8_t *)(p))[1]) <<  8) | \
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	((uint64_t)(((uint8_t *)(p))[2]) << 16) | \
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	((uint64_t)(((uint8_t *)(p))[3]) << 24) | \
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	((uint64_t)(((uint8_t *)(p))[4]) << 32) | \
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	((uint64_t)(((uint8_t *)(p))[5]) << 40) | \
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	((uint64_t)(((uint8_t *)(p))[6]) << 48) | \
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	((uint64_t)(((uint8_t *)(p))[7]) << 56))
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/* Load a 64-bit big endian integer */
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#define LD64BE(p) ( \
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	((uint64_t)(((uint8_t *)(p))[0]) << 56) | \
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	((uint64_t)(((uint8_t *)(p))[1]) << 48) | \
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	((uint64_t)(((uint8_t *)(p))[2]) << 40) | \
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	((uint64_t)(((uint8_t *)(p))[3]) << 32) | \
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	((uint64_t)(((uint8_t *)(p))[4]) << 24) | \
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	((uint64_t)(((uint8_t *)(p))[5]) << 16) | \
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	((uint64_t)(((uint8_t *)(p))[6]) <<  8) | \
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	((uint64_t)(((uint8_t *)(p))[7]) <<  0))
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/* Store a 16-bit little endian integer */
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#define ST16LE(p, x) \
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	((uint8_t *)(p))[0] = ((uint16_t)(x) >> 0) & 0xFFu; \
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	((uint8_t *)(p))[1] = ((uint16_t)(x) >> 8) & 0xFFu
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/* Store a 16-bit big endian integer */
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#define ST16BE(p, x) \
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	((uint8_t *)(p))[0] = ((uint16_t)(x) >> 8) & 0xFFu; \
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	((uint8_t *)(p))[1] = ((uint16_t)(x) >> 0) & 0xFFu
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/* Store a 32-bit little endian integer */
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#define ST32LE(p, x) \
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	((uint8_t *)(p))[0] = ((uint32_t)(x) >>  0) & 0xFFu; \
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	((uint8_t *)(p))[1] = ((uint32_t)(x) >>  8) & 0xFFu; \
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	((uint8_t *)(p))[2] = ((uint32_t)(x) >> 16) & 0xFFu; \
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	((uint8_t *)(p))[3] = ((uint32_t)(x) >> 24) & 0xFFu
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/* Store a 32-bit big endian integer */
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#define ST32BE(p, x) \
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	((uint8_t *)(p))[0] = ((uint32_t)(x) >> 24) & 0xFFu; \
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	((uint8_t *)(p))[1] = ((uint32_t)(x) >> 16) & 0xFFu; \
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	((uint8_t *)(p))[2] = ((uint32_t)(x) >>  8) & 0xFFu; \
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	((uint8_t *)(p))[3] = ((uint32_t)(x) >>  0) & 0xFFu
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/* Store a 64-bit little endian integer */
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#define ST64LE(p, x) \
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	((uint8_t *)(p))[0] = ((uint64_t)(x) >>  0) & 0xFFu; \
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	((uint8_t *)(p))[1] = ((uint64_t)(x) >>  8) & 0xFFu; \
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	((uint8_t *)(p))[2] = ((uint64_t)(x) >> 16) & 0xFFu; \
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	((uint8_t *)(p))[3] = ((uint64_t)(x) >> 24) & 0xFFu; \
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	((uint8_t *)(p))[4] = ((uint64_t)(x) >> 32) & 0xFFu; \
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	((uint8_t *)(p))[5] = ((uint64_t)(x) >> 40) & 0xFFu; \
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	((uint8_t *)(p))[6] = ((uint64_t)(x) >> 48) & 0xFFu; \
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	((uint8_t *)(p))[7] = ((uint64_t)(x) >> 56) & 0xFFu
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/* Store a 64-bit big endian integer */
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#define ST64BE(p, x) \
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	((uint8_t *)(p))[0] = ((uint64_t)(x) >> 56) & 0xFFu; \
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	((uint8_t *)(p))[1] = ((uint64_t)(x) >> 48) & 0xFFu; \
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	((uint8_t *)(p))[2] = ((uint64_t)(x) >> 40) & 0xFFu; \
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	((uint8_t *)(p))[3] = ((uint64_t)(x) >> 32) & 0xFFu; \
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	((uint8_t *)(p))[4] = ((uint64_t)(x) >> 24) & 0xFFu; \
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	((uint8_t *)(p))[5] = ((uint64_t)(x) >> 16) & 0xFFu; \
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	((uint8_t *)(p))[6] = ((uint64_t)(x) >>  8) & 0xFFu; \
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	((uint8_t *)(p))[7] = ((uint64_t)(x) >>  0) & 0xFFu
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif // UTIL_ENDIAN_H_G7AID2RQ
 
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