| #ifndef _OSMO_BITS_H |
| #define _OSMO_BITS_H |
| |
| #include <stdint.h> |
| |
| typedef int8_t sbit_t; /* soft bit (-127...127) */ |
| typedef uint8_t ubit_t; /* unpacked bit (0 or 1) */ |
| typedef uint8_t pbit_t; /* packed bis (8 bits in a byte) */ |
| |
| /* |
| NOTE on the endianess of pbit_t: |
| Bits in a pbit_t are ordered MSB first, i.e. 0x80 is the first bit. |
| Bit i in a pbit_t array is array[i/8] & (1<<(7-i%8)) |
| */ |
| |
| /* determine how many bytes we would need for 'num_bits' packed bits */ |
| static inline unsigned int osmo_pbit_bytesize(unsigned int num_bits) |
| { |
| unsigned int pbit_bytesize = num_bits / 8; |
| |
| if (num_bits % 8) |
| pbit_bytesize++; |
| |
| return pbit_bytesize; |
| } |
| |
| /* convert unpacked bits to packed bits, return length in bytes */ |
| int osmo_ubit2pbit(pbit_t *out, const ubit_t *in, unsigned int num_bits); |
| |
| /* convert packed bits to unpacked bits, return length in bytes */ |
| int osmo_pbit2ubit(ubit_t *out, const pbit_t *in, unsigned int num_bits); |
| |
| /* convert unpacked bits to packed bits (extended options but slower), |
| * return length in bytes (max written ofs of output buffer + 1) */ |
| int osmo_ubit2pbit_ext(pbit_t *out, unsigned int out_ofs, |
| const ubit_t *in, unsigned int in_ofs, |
| unsigned int num_bits, int lsb_mode); |
| |
| /* convert packed bits to unpacked bits (extended options but slower), |
| * return length in bytes (max written ofs of output buffer + 1) */ |
| int osmo_pbit2ubit_ext(ubit_t *out, unsigned int out_ofs, |
| const pbit_t *in, unsigned int in_ofs, |
| unsigned int num_bits, int lsb_mode); |
| |
| #endif |