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102 lines
3.0 KiB
102 lines
3.0 KiB
/*****************************************************************************
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* numbers.h: BCD functions
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*****************************************************************************
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* Copyright (C) 2009-2010 VideoLAN
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*
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* Authors: Christophe Massiot <massiot@via.ecp.fr>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject
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* to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*****************************************************************************/
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#ifndef __BITSTREAM_DVB_BCD_H__
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#define __BITSTREAM_DVB_BCD_H__
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#include <stdint.h> /* uint8_t, uint16_t, etc... */
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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/*****************************************************************************
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* DVB numbers
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*****************************************************************************/
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static inline unsigned int dvb_bcd_get(const uint8_t *p_bcd, uint8_t i_width)
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{
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unsigned int i_result = 0;
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while (i_width >= 8) {
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i_result *= 10;
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i_result += (*p_bcd) >> 4;
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i_result *= 10;
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i_result += (*p_bcd) & 0xf;
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i_width -= 8;
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p_bcd++;
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}
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if (i_width == 4) {
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i_result *= 10;
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i_result += (*p_bcd) >> 4;
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}
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return i_result;
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}
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static inline void dvb_bcd_set(uint8_t *p_bcd, unsigned int i_int,
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uint8_t i_width)
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{
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/* calculate 10^(i_width/4-1) */
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unsigned int i_factor = 1, i_exp = i_width / 4 - 1, i_base = 10;
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while (i_exp)
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{
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if (i_exp & 1)
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i_factor *= i_base;
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i_exp >>= 1;
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i_base *= i_base;
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}
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while (i_factor >= 10) {
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*p_bcd = (i_int / i_factor) << 4;
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i_int %= i_factor;
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i_factor /= 10;
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*p_bcd |= (i_int / i_factor);
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i_int %= i_factor;
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i_factor /= 10;
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p_bcd++;
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}
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if (i_factor == 1) {
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*p_bcd &= 0xf;
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*p_bcd |= i_int << 4;
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}
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}
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static inline uint8_t dvb_bcd_set8(unsigned int i_int)
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{
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uint8_t i_result;
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dvb_bcd_set(&i_result, i_int, 8);
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return i_result;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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