46 lines
1.2 KiB
C
46 lines
1.2 KiB
C
/* $Id: rw_unaligned.h,v 1.1 2022/10/16 06:02:01 nanard Exp $ */
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/* MiniUPnP project
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* http://miniupnp.free.fr/ or https://miniupnp.tuxfamily.org/
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* (c) 2012-2022 Thomas Bernard
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* This software is subject to the conditions detailed
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* in the LICENCE file provided within the distribution */
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#ifndef RW_UNALIGNED_H_INCLUDED
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#define RW_UNALIGNED_H_INCLUDED
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#include <stdint.h>
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#ifndef INLINE
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#define INLINE static inline
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#endif
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/* theses macros are designed to read/write unsigned short/long int
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* from an unsigned char array in network order (big endian).
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* Avoid pointer casting, so avoid accessing unaligned memory, which
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* can crash with some cpu's */
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INLINE uint32_t readnu32(const uint8_t * p)
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{
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return (p[0] << 24 | p[1] << 16 | p[2] << 8 | p[3]);
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}
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#define READNU32(p) readnu32(p)
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INLINE uint16_t readnu16(const uint8_t * p)
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{
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return (p[0] << 8 | p[1]);
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}
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#define READNU16(p) readnu16(p)
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INLINE void writenu32(uint8_t * p, uint32_t n)
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{
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p[0] = (n & 0xff000000) >> 24;
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p[1] = (n & 0xff0000) >> 16;
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p[2] = (n & 0xff00) >> 8;
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p[3] = n & 0xff;
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}
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#define WRITENU32(p, n) writenu32(p, n)
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INLINE void writenu16(uint8_t * p, uint16_t n)
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{
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p[0] = (n & 0xff00) >> 8;
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p[1] = n & 0xff;
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}
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#define WRITENU16(p, n) writenu16(p, n)
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#endif /* RW_UNALIGNED_H_INCLUDED */
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