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added bit manipulation helpers

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Ahmet Inan 2018-09-22 19:13:37 +02:00
commit abe4edc419
2 changed files with 49 additions and 0 deletions
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/*
Bit manipulation of byte arrays
Copyright 2018 Ahmet Inan <inan@aicodix.de>
*/
#ifndef BITMAN_HH
#define BITMAN_HH
namespace CODE {
void xor_be_bit(uint8_t *buf, int pos, bool val)
{
buf[pos/8] ^= val<<(7-pos%8);
}
void xor_le_bit(uint8_t *buf, int pos, bool val)
{
buf[pos/8] ^= val<<(pos%8);
}
void set_be_bit(uint8_t *buf, int pos, bool val)
{
buf[pos/8] = (~(1<<(7-pos%8))&buf[pos/8])|(val<<(7-pos%8));
}
void set_le_bit(uint8_t *buf, int pos, bool val)
{
buf[pos/8] = (~(1<<(pos%8))&buf[pos/8])|(val<<(pos%8));
}
bool get_be_bit(uint8_t *buf, int pos)
{
return (buf[pos/8]>>(7-pos%8))&1;
}
bool get_le_bit(uint8_t *buf, int pos)
{
return (buf[pos/8]>>(pos%8))&1;
}
}
#endif