/*

 * Copyright (c) 2017 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_i15_decode(uint16_t *x, const void *src, size_t len)

{

  const unsigned char *buf;

  size_t v;

  uint32_t acc;

  int acc_len;

  buf = src;

  v = 1;

  acc = 0;

  acc_len = 0;

  while (len -- > 0) {

    uint32_t b;

    b = buf[len];

    acc |= (b << acc_len);

    acc_len += 8;

    if (acc_len >= 15) {

      x[v ++] = acc & 0x7FFF;

      acc_len -= 15;

      acc >>= 15;

    }

  }

  if (acc_len != 0) {

    x[v ++] = acc;

  }

  x[0] = br_i15_bit_length(x + 1, v - 1);

}