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bytes.h: byte-order utilities.

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Daniel Beer 2013-08-27 14:56:54 +12:00
parent a64c940a20
commit 83f0d66597
1 changed files with 82 additions and 0 deletions
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/* MSPDebug - debugging tool for MSP430 MCUs
* Copyright (C) 2009-2013 Daniel Beer
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef BYTES_H_
#define BYTES_H_
#include <stdint.h>
/* Read/write big-endian 16-bit */
static inline uint16_t r16be(const uint8_t *buf)
{
return (((uint16_t)buf[0]) << 8) | ((uint16_t)buf[1]);
}
static inline void w16be(uint8_t *buf, uint16_t v)
{
buf[0] = v >> 8;
buf[1] = v;
}
/* Read/write little-endian 16-bit */
static inline uint16_t r16le(const uint8_t *buf)
{
return (((uint16_t)buf[1]) << 8) | ((uint16_t)buf[0]);
}
static inline void w16le(uint8_t *buf, uint16_t v)
{
buf[1] = v >> 8;
buf[0] = v;
}
/* Read/write big-endian 32-bit */
static inline uint32_t r32be(const uint8_t *buf)
{
return (((uint32_t)buf[0]) << 24) |
(((uint32_t)buf[1]) << 16) |
(((uint32_t)buf[2]) << 8) |
((uint32_t)buf[3]);
}
static inline void w32be(uint8_t *buf, uint32_t v)
{
buf[0] = v >> 24;
buf[1] = v >> 16;
buf[2] = v >> 8;
buf[3] = v;
}
/* Read/write little-endian 32-bit */
static inline uint32_t r32le(const uint8_t *buf)
{
return (((uint32_t)buf[3]) << 24) |
(((uint32_t)buf[2]) << 16) |
(((uint32_t)buf[1]) << 8) |
((uint32_t)buf[0]);
}
static inline void w32le(uint8_t *buf, uint32_t v)
{
buf[3] = v >> 24;
buf[2] = v >> 16;
buf[1] = v >> 8;
buf[0] = v;
}
#endif