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libsigrok-internal.h: add u64be endianess writer 

Add endianess aware writer for uint64_t data in BE format. This is
motivated by the Codethink Interrogizer.
This commit is contained in:
Gerhard Sittig 2020-10-26 19:48:22 +01:00
parent 6bee394dee
commit efce57da32
1 changed files with 17 additions and 0 deletions
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17
src/libsigrok-internal.h
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@ -475,6 +475,23 @@ static inline void write_u32le(uint8_t *p, uint32_t x)
} }
#define WL32(p, x) write_u32le((uint8_t *)(p), (uint32_t)(x)) #define WL32(p, x) write_u32le((uint8_t *)(p), (uint32_t)(x))
/**
* Write a 64 bits unsigned integer to memory stored as big endian.
* @param p a pointer to the output memory
* @param x the input unsigned integer
*/
static inline void write_u64be(uint8_t *p, uint64_t x)
{
p[7] = x & 0xff; x >>= 8;
p[6] = x & 0xff; x >>= 8;
p[5] = x & 0xff; x >>= 8;
p[4] = x & 0xff; x >>= 8;
p[3] = x & 0xff; x >>= 8;
p[2] = x & 0xff; x >>= 8;
p[1] = x & 0xff; x >>= 8;
p[0] = x & 0xff; x >>= 8;
}
/** /**
* Write a 64 bits unsigned integer to memory stored as little endian. * Write a 64 bits unsigned integer to memory stored as little endian.
* @param p a pointer to the output memory * @param p a pointer to the output memory