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head/contrib/bearssl/src/int/i31_decode.c
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svn:eol-style | null | native \ No newline at end of property |
svn:keywords | null | FreeBSD=%H \ No newline at end of property |
svn:mime-type | null | text/plain \ No newline at end of property |
/* | |||||
* Copyright (c) 2016 Thomas Pornin <pornin@bolet.org> | |||||
* | |||||
* Permission is hereby granted, free of charge, to any person obtaining | |||||
* a copy of this software and associated documentation files (the | |||||
* "Software"), to deal in the Software without restriction, including | |||||
* without limitation the rights to use, copy, modify, merge, publish, | |||||
* distribute, sublicense, and/or sell copies of the Software, and to | |||||
* permit persons to whom the Software is furnished to do so, subject to | |||||
* the following conditions: | |||||
* | |||||
* The above copyright notice and this permission notice shall be | |||||
* included in all copies or substantial portions of the Software. | |||||
* | |||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |||||
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |||||
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |||||
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |||||
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |||||
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |||||
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |||||
* SOFTWARE. | |||||
*/ | |||||
#include "inner.h" | |||||
/* see inner.h */ | |||||
void | |||||
br_i31_decode(uint32_t *x, const void *src, size_t len) | |||||
{ | |||||
const unsigned char *buf; | |||||
size_t u, v; | |||||
uint32_t acc; | |||||
int acc_len; | |||||
buf = src; | |||||
u = len; | |||||
v = 1; | |||||
acc = 0; | |||||
acc_len = 0; | |||||
while (u -- > 0) { | |||||
uint32_t b; | |||||
b = buf[u]; | |||||
acc |= (b << acc_len); | |||||
acc_len += 8; | |||||
if (acc_len >= 31) { | |||||
x[v ++] = acc & (uint32_t)0x7FFFFFFF; | |||||
acc_len -= 31; | |||||
acc = b >> (8 - acc_len); | |||||
} | |||||
} | |||||
if (acc_len != 0) { | |||||
x[v ++] = acc; | |||||
} | |||||
x[0] = br_i31_bit_length(x + 1, v - 1); | |||||
} |