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74 lines
3.2 KiB
74 lines
3.2 KiB
10 years ago
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#pragma once
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#include <stdint.h>
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#include "compiler.h"
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static const uint8_t BitReverseTable256[] =
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{
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0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0, 0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0,
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0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8, 0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8,
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0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4, 0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4,
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0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC, 0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC,
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0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2, 0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2,
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0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA, 0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA,
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0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6, 0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6,
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0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE, 0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE,
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0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1, 0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1,
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0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9, 0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9,
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0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5, 0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5,
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0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED, 0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD,
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0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3, 0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3,
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0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB, 0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB,
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0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7, 0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7,
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0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF, 0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF
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};
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static inline uint32_t bitfn_swap32(uint32_t a) {
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return (BitReverseTable256[a & 0xff] << 24) |
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(BitReverseTable256[(a >> 8) & 0xff] << 16) |
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(BitReverseTable256[(a >> 16) & 0xff] << 8) |
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(BitReverseTable256[(a >> 24) & 0xff]);
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}
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static inline uint64_t bitfn_swap64(uint64_t a) {
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return ((uint64_t) bitfn_swap32((uint32_t) (a >> 32))) |
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(((uint64_t) bitfn_swap32((uint32_t) a)) << 32);
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}
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#if defined(__MINGW32__) || defined(_WIN32)
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# define LITTLE_ENDIAN 1234
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# define BYTE_ORDER LITTLE_ENDIAN
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#elif defined(__FreeBSD__) || defined(__DragonFly__) || defined(__NetBSD__)
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# include <sys/endian.h>
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#elif defined(__OpenBSD__) || defined(__SVR4)
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# include <sys/types.h>
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#elif defined(__APPLE__)
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# include <machine/endian.h>
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#elif defined( BSD ) && (BSD >= 199103)
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# include <machine/endian.h>
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#elif defined( __QNXNTO__ ) && defined( __LITTLEENDIAN__ )
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# define LITTLE_ENDIAN 1234
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# define BYTE_ORDER LITTLE_ENDIAN
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#elif defined( __QNXNTO__ ) && defined( __BIGENDIAN__ )
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# define BIG_ENDIAN 1234
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# define BYTE_ORDER BIG_ENDIAN
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#else
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# include <endian.h>
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#endif
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#if LITTLE_ENDIAN == BYTE_ORDER
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#define fix_endian32(x) (x)
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#define fix_endian64(x) (x)
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#elif BIG_ENDIAN == BYTE_ORDER
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#define fix_endian32(x) bitfn_swap32(x)
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#define fix_endian64(x) bitfn_swap64(x)
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#else
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# error "endian not supported"
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#endif // BYTE_ORDER
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