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| #include <sys/types.h> |
| #include <stdint.h> |
| #include <string.h> |
|
|
| #include "readstat_bits.h" |
|
|
| int machine_is_little_endian(void) { |
| int test_byte_order = 1; |
| return ((char *)&test_byte_order)[0]; |
| } |
|
|
| char ones_to_twos_complement1(char num) { |
| return num < 0 ? num+1 : num; |
| } |
|
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| int16_t ones_to_twos_complement2(int16_t num) { |
| return num < 0 ? num+1 : num; |
| } |
|
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| int32_t ones_to_twos_complement4(int32_t num) { |
| return num < 0 ? num+1 : num; |
| } |
|
|
| char twos_to_ones_complement1(char num) { |
| return num < 0 ? num-1 : num; |
| } |
|
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| int16_t twos_to_ones_complement2(int16_t num) { |
| return num < 0 ? num-1 : num; |
| } |
|
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| int32_t twos_to_ones_complement4(int32_t num) { |
| return num < 0 ? num-1 : num; |
| } |
|
|
| uint16_t byteswap2(uint16_t num) { |
| return ((num & 0xFF00) >> 8) | ((num & 0x00FF) << 8); |
| } |
|
|
| uint32_t byteswap4(uint32_t num) { |
| num = ((num & 0xFFFF0000) >> 16) | ((num & 0x0000FFFF) << 16); |
| return ((num & 0xFF00FF00) >> 8) | ((num & 0x00FF00FF) << 8); |
| } |
|
|
| uint64_t byteswap8(uint64_t num) { |
| num = ((num & 0xFFFFFFFF00000000) >> 32) | ((num & 0x00000000FFFFFFFF) << 32); |
| num = ((num & 0xFFFF0000FFFF0000) >> 16) | ((num & 0x0000FFFF0000FFFF) << 16); |
| return ((num & 0xFF00FF00FF00FF00) >> 8) | ((num & 0x00FF00FF00FF00FF) << 8); |
| } |
|
|
| float byteswap_float(float num) { |
| uint32_t answer = 0; |
| memcpy(&answer, &num, 4); |
| answer = byteswap4(answer); |
| memcpy(&num, &answer, 4); |
| return num; |
| } |
|
|
| double byteswap_double(double num) { |
| uint64_t answer = 0; |
| memcpy(&answer, &num, 8); |
| answer = byteswap8(answer); |
| memcpy(&num, &answer, 8); |
| return num; |
| } |
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