diff options
Diffstat (limited to 'CAN-binder/libs/bitfield-c/src/bitfield/8byte.c')
-rw-r--r-- | CAN-binder/libs/bitfield-c/src/bitfield/8byte.c | 61 |
1 files changed, 0 insertions, 61 deletions
diff --git a/CAN-binder/libs/bitfield-c/src/bitfield/8byte.c b/CAN-binder/libs/bitfield-c/src/bitfield/8byte.c deleted file mode 100644 index 9325ed1..0000000 --- a/CAN-binder/libs/bitfield-c/src/bitfield/8byte.c +++ /dev/null @@ -1,61 +0,0 @@ -#include <bitfield/bitfield.h> -#include <bitfield/8byte.h> -#include <stddef.h> -#include <limits.h> -#include <string.h> - -#define EIGHTBYTE_BIT (8 * sizeof(uint64_t)) - -uint8_t eightbyte_get_nibble(const uint64_t source, const uint8_t nibble_index, - const bool data_is_big_endian) { - return (uint8_t) eightbyte_get_bitfield(source, NIBBLE_SIZE * nibble_index, - NIBBLE_SIZE, data_is_big_endian); -} - -uint8_t eightbyte_get_byte(uint64_t source, const uint8_t byte_index, - const bool data_is_big_endian) { - if(data_is_big_endian) { - source = __builtin_bswap64(source); - } - return (source >> (EIGHTBYTE_BIT - ((byte_index + 1) * CHAR_BIT))) & 0xFF; -} - -// TODO is this funciton necessary anymore? is it any faster for uint64_t than -// get_bitfield(data[], ...)? is the performance better on a 32 bit platform -// like the PIC32? -uint64_t eightbyte_get_bitfield(uint64_t source, const uint16_t offset, - const uint16_t bit_count, const bool data_is_big_endian) { - int startByte = offset / CHAR_BIT; - int endByte = (offset + bit_count - 1) / CHAR_BIT; - - if(!data_is_big_endian) { - source = __builtin_bswap64(source); - } - - uint8_t* bytes = (uint8_t*)&source; - uint64_t ret = bytes[startByte]; - if(startByte != endByte) { - // The lowest byte address contains the most significant bit. - uint8_t i; - for(i = startByte + 1; i <= endByte; i++) { - ret = ret << 8; - ret = ret | bytes[i]; - } - } - - ret >>= 8 - find_end_bit(offset + bit_count); - return ret & bitmask(bit_count); -} - -bool eightbyte_set_bitfield(uint64_t value, const uint16_t offset, - const uint16_t bit_count, uint64_t* destination) { - if(value > bitmask(bit_count)) { - return false; - } - - int shiftDistance = EIGHTBYTE_BIT - offset - bit_count; - value <<= shiftDistance; - *destination &= ~(bitmask(bit_count) << shiftDistance); - *destination |= value; - return true; -} |