1*0957b409SSimon J. Gerraty /* 2*0957b409SSimon J. Gerraty * Copyright (c) 2017 Thomas Pornin <pornin@bolet.org> 3*0957b409SSimon J. Gerraty * 4*0957b409SSimon J. Gerraty * Permission is hereby granted, free of charge, to any person obtaining 5*0957b409SSimon J. Gerraty * a copy of this software and associated documentation files (the 6*0957b409SSimon J. Gerraty * "Software"), to deal in the Software without restriction, including 7*0957b409SSimon J. Gerraty * without limitation the rights to use, copy, modify, merge, publish, 8*0957b409SSimon J. Gerraty * distribute, sublicense, and/or sell copies of the Software, and to 9*0957b409SSimon J. Gerraty * permit persons to whom the Software is furnished to do so, subject to 10*0957b409SSimon J. Gerraty * the following conditions: 11*0957b409SSimon J. Gerraty * 12*0957b409SSimon J. Gerraty * The above copyright notice and this permission notice shall be 13*0957b409SSimon J. Gerraty * included in all copies or substantial portions of the Software. 14*0957b409SSimon J. Gerraty * 15*0957b409SSimon J. Gerraty * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 16*0957b409SSimon J. Gerraty * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 17*0957b409SSimon J. Gerraty * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 18*0957b409SSimon J. Gerraty * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 19*0957b409SSimon J. Gerraty * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 20*0957b409SSimon J. Gerraty * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 21*0957b409SSimon J. Gerraty * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 22*0957b409SSimon J. Gerraty * SOFTWARE. 23*0957b409SSimon J. Gerraty */ 24*0957b409SSimon J. Gerraty 25*0957b409SSimon J. Gerraty #include "inner.h" 26*0957b409SSimon J. Gerraty 27*0957b409SSimon J. Gerraty /* see inner.h */ 28*0957b409SSimon J. Gerraty void 29*0957b409SSimon J. Gerraty br_i15_decode(uint16_t *x, const void *src, size_t len) 30*0957b409SSimon J. Gerraty { 31*0957b409SSimon J. Gerraty const unsigned char *buf; 32*0957b409SSimon J. Gerraty size_t v; 33*0957b409SSimon J. Gerraty uint32_t acc; 34*0957b409SSimon J. Gerraty int acc_len; 35*0957b409SSimon J. Gerraty 36*0957b409SSimon J. Gerraty buf = src; 37*0957b409SSimon J. Gerraty v = 1; 38*0957b409SSimon J. Gerraty acc = 0; 39*0957b409SSimon J. Gerraty acc_len = 0; 40*0957b409SSimon J. Gerraty while (len -- > 0) { 41*0957b409SSimon J. Gerraty uint32_t b; 42*0957b409SSimon J. Gerraty 43*0957b409SSimon J. Gerraty b = buf[len]; 44*0957b409SSimon J. Gerraty acc |= (b << acc_len); 45*0957b409SSimon J. Gerraty acc_len += 8; 46*0957b409SSimon J. Gerraty if (acc_len >= 15) { 47*0957b409SSimon J. Gerraty x[v ++] = acc & 0x7FFF; 48*0957b409SSimon J. Gerraty acc_len -= 15; 49*0957b409SSimon J. Gerraty acc >>= 15; 50*0957b409SSimon J. Gerraty } 51*0957b409SSimon J. Gerraty } 52*0957b409SSimon J. Gerraty if (acc_len != 0) { 53*0957b409SSimon J. Gerraty x[v ++] = acc; 54*0957b409SSimon J. Gerraty } 55*0957b409SSimon J. Gerraty x[0] = br_i15_bit_length(x + 1, v - 1); 56*0957b409SSimon J. Gerraty } 57