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62 lines
2.5 KiB
C
62 lines
2.5 KiB
C
/*
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bit_ops.h
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Functions for dealing with conversion of data between types
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Copyright (c) 2006 Michael "Chishm" Chisholm
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation and/or
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other materials provided with the distribution.
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3. The name of the author may not be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __BIT_OPS_H
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#define __BIT_OPS_H
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#include <stdint.h>
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/*-----------------------------------------------------------------
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Functions to deal with little endian values stored in uint8_t arrays
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-----------------------------------------------------------------*/
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static inline uint16_t u8array_to_u16 ( const uint8_t* item, int offset )
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{
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return ( item[offset] | ( item[offset + 1] << 8 ) );
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}
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static inline uint32_t u8array_to_u32 ( const uint8_t* item, int offset )
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{
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return ( item[offset] | ( item[offset + 1] << 8 ) | ( item[offset + 2] << 16 ) | ( item[offset + 3] << 24 ) );
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}
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static inline void u16_to_u8array ( uint8_t* item, int offset, uint16_t value )
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{
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item[offset] = ( uint8_t ) value;
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item[offset + 1] = ( uint8_t )( value >> 8 );
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}
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static inline void u32_to_u8array ( uint8_t* item, int offset, uint32_t value )
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{
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item[offset] = ( uint8_t ) value;
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item[offset + 1] = ( uint8_t )( value >> 8 );
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item[offset + 2] = ( uint8_t )( value >> 16 );
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item[offset + 3] = ( uint8_t )( value >> 24 );
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}
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#endif // _BIT_OPS_H
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