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Diffstat (limited to 'common/util.c')
-rw-r--r-- | common/util.c | 101 |
1 files changed, 0 insertions, 101 deletions
diff --git a/common/util.c b/common/util.c deleted file mode 100644 index 7e0d542993..0000000000 --- a/common/util.c +++ /dev/null @@ -1,101 +0,0 @@ -/* -Copyright 2011 Jun Wako <wakojun@gmail.com> - -This program is free software: you can redistribute it and/or modify -it under the terms of the GNU General Public License as published by -the Free Software Foundation, either version 2 of the License, or -(at your option) any later version. - -This program is distributed in the hope that it will be useful, -but WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -GNU General Public License for more details. - -You should have received a copy of the GNU General Public License -along with this program. If not, see <http://www.gnu.org/licenses/>. -*/ - -#include "util.h" - -// bit population - return number of on-bit -uint8_t bitpop(uint8_t bits) -{ - uint8_t c; - for (c = 0; bits; c++) - bits &= bits - 1; - return c; -/* - const uint8_t bit_count[] = { 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4 }; - return bit_count[bits>>4] + bit_count[bits&0x0F] -*/ -} - -uint8_t bitpop16(uint16_t bits) -{ - uint8_t c; - for (c = 0; bits; c++) - bits &= bits - 1; - return c; -} - -uint8_t bitpop32(uint32_t bits) -{ - uint8_t c; - for (c = 0; bits; c++) - bits &= bits - 1; - return c; -} - -// most significant on-bit - return highest location of on-bit -// NOTE: return 0 when bit0 is on or all bits are off -uint8_t biton(uint8_t bits) -{ - uint8_t n = 0; - if (bits >> 4) { bits >>= 4; n += 4;} - if (bits >> 2) { bits >>= 2; n += 2;} - if (bits >> 1) { bits >>= 1; n += 1;} - return n; -} - -uint8_t biton16(uint16_t bits) -{ - uint8_t n = 0; - if (bits >> 8) { bits >>= 8; n += 8;} - if (bits >> 4) { bits >>= 4; n += 4;} - if (bits >> 2) { bits >>= 2; n += 2;} - if (bits >> 1) { bits >>= 1; n += 1;} - return n; -} - -uint8_t biton32(uint32_t bits) -{ - uint8_t n = 0; - if (bits >>16) { bits >>=16; n +=16;} - if (bits >> 8) { bits >>= 8; n += 8;} - if (bits >> 4) { bits >>= 4; n += 4;} - if (bits >> 2) { bits >>= 2; n += 2;} - if (bits >> 1) { bits >>= 1; n += 1;} - return n; -} - - - -uint8_t bitrev(uint8_t bits) -{ - bits = (bits & 0x0f)<<4 | (bits & 0xf0)>>4; - bits = (bits & 0b00110011)<<2 | (bits & 0b11001100)>>2; - bits = (bits & 0b01010101)<<1 | (bits & 0b10101010)>>1; - return bits; -} - -uint16_t bitrev16(uint16_t bits) -{ - bits = bitrev(bits & 0x00ff)<<8 | bitrev((bits & 0xff00)>>8); - return bits; -} - -uint32_t bitrev32(uint32_t bits) -{ - bits = (uint32_t)bitrev16(bits & 0x0000ffff)<<16 | bitrev16((bits & 0xffff0000)>>16); - return bits; -} |