mirror of
https://github.com/signalwire/freeswitch.git
synced 2026-07-16 09:11:57 +00:00
Sergey Safarov
77 lines
2.4 KiB
C
77 lines
2.4 KiB
C
/*
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* Copyright (c) 2016, Athonet (www.athonet.com)
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* Paolo Missiaggia <paolo.missiaggia@athonet.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* * Neither the name of the original author; nor the names of any contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
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* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __BITSHIFT_H__
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#include "bitshift.h"
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/*
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* LEFT shift of an entire array of N bits, with N included between 0 and 8
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*/
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extern int switch_amr_array_lshift(uint8_t lshift, uint8_t *buf, int a_len)
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{
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int i = 0;
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uint8_t first_byte;
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uint8_t second_byte;
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if (!buf || !a_len)
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return (-1);
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if ((lshift < 0) || (lshift > 8))
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return (-1);
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first_byte = 0xFF >> lshift;
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second_byte = ~first_byte;
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for (i = 1; i < a_len; i++) {
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buf[i - 1] = ((buf[i - 1] & first_byte) << lshift) |
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((buf[i] & second_byte) >> (8 - lshift));
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}
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i--;
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buf[i] = ((buf[i] & first_byte) << lshift);
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return (0);
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}
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#endif
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/* For Emacs:
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* Local Variables:
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* mode:c
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* indent-tabs-mode:t
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* tab-width:4
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* c-basic-offset:4
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* End:
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* For VIM:
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* vim:set softtabstop=4 shiftwidth=4 tabstop=4 noet:
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*/
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