| Harald Welte | 2230c13 | 2011-01-19 10:10:16 +0100 | [diff] [blame^] | 1 | |
| 2 | #include <stdint.h> |
| 3 | |
| 4 | #include <osmocore/bits.h> |
| 5 | |
| 6 | /* convert unpacked bits to packed bits, return length in bytes */ |
| 7 | int osmo_ubit2pbit(pbit_t *out, const ubit_t *in, unsigned int num_bits) |
| 8 | { |
| 9 | unsigned int i; |
| 10 | uint8_t curbyte = 0; |
| 11 | pbit_t *outptr = out; |
| 12 | |
| 13 | for (i = 0; i < num_bits; i++) { |
| 14 | uint8_t bitnum = 7 - (i % 8); |
| 15 | |
| 16 | curbyte |= (in[i] << bitnum); |
| 17 | |
| 18 | if (i > 0 && i % 8 == 0) { |
| 19 | *outptr++ = curbyte; |
| 20 | curbyte = 0; |
| 21 | } |
| 22 | } |
| 23 | /* we have a non-modulo-8 bitcount */ |
| 24 | if (i % 8) |
| 25 | *outptr++ = curbyte; |
| 26 | |
| 27 | return outptr - out; |
| 28 | } |
| 29 | |
| 30 | /* convert packed bits to unpacked bits, return length in bytes */ |
| 31 | int osmo_pbit2ubit(ubit_t *out, const pbit_t *in, unsigned int num_bits) |
| 32 | { |
| 33 | unsigned int i; |
| 34 | ubit_t *cur = out; |
| 35 | ubit_t *limit = out + num_bits; |
| 36 | |
| 37 | for (i = 0; i < (num_bits/8)+1; i++) { |
| 38 | pbit_t byte = in[i]; |
| 39 | *cur++ = (byte >> 7) & 1; |
| 40 | if (cur >= limit) |
| 41 | break; |
| 42 | *cur++ = (byte >> 6) & 1; |
| 43 | if (cur >= limit) |
| 44 | break; |
| 45 | *cur++ = (byte >> 5) & 1; |
| 46 | if (cur >= limit) |
| 47 | break; |
| 48 | *cur++ = (byte >> 4) & 1; |
| 49 | if (cur >= limit) |
| 50 | break; |
| 51 | *cur++ = (byte >> 3) & 1; |
| 52 | if (cur >= limit) |
| 53 | break; |
| 54 | *cur++ = (byte >> 2) & 1; |
| 55 | if (cur >= limit) |
| 56 | break; |
| 57 | *cur++ = (byte >> 1) & 1; |
| 58 | if (cur >= limit) |
| 59 | break; |
| 60 | *cur++ = (byte >> 0) & 1; |
| 61 | if (cur >= limit) |
| 62 | break; |
| 63 | } |
| 64 | return cur - out; |
| 65 | } |