| /* libFLAC - Free Lossless Audio Codec library |
| * Copyright (C) 2001 Josh Coalson |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library 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 |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public |
| * License along with this library; if not, write to the |
| * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| * Boston, MA 02111-1307, USA. |
| */ |
| |
| #include <assert.h> |
| #include "private/bitmath.h" |
| |
| unsigned FLAC__bitmath_ilog2(unsigned v) |
| { |
| unsigned l = 0; |
| assert(v > 0); |
| while(v >>= 1) |
| l++; |
| return l; |
| } |
| |
| unsigned FLAC__bitmath_silog2(int v) |
| { |
| while(1) { |
| if(v == 0) { |
| return 0; |
| } |
| else if(v > 0) { |
| unsigned l = 0; |
| while(v) { |
| l++; |
| v >>= 1; |
| } |
| return l+1; |
| } |
| else if(v == -1) { |
| return 2; |
| } |
| else { |
| v = -(++v); |
| } |
| } |
| } |