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libsigrok-internal.h: add 24bit little endian reader helper 

Add another endianess conversion helper which reads 24bit values in
little endian format.
This commit is contained in:
Gerhard Sittig 2020-05-12 23:16:05 +02:00
parent f1833600a0
commit 080b6bcf09
1 changed files with 34 additions and 0 deletions
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34
src/libsigrok-internal.h
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@ -142,6 +142,23 @@ static inline int16_t read_i16le(const uint8_t *p)
} }
#define RL16S(x) read_i16le((const uint8_t *)(x)) #define RL16S(x) read_i16le((const uint8_t *)(x))
/**
* Read a 24 bits little endian unsigned integer out of memory.
* @param x a pointer to the input memory
* @return the corresponding unsigned integer
*/
static inline uint32_t read_u24le(const uint8_t *p)
{
uint32_t u;
u = 0;
u <<= 8; u |= p[2];
u <<= 8; u |= p[1];
u <<= 8; u |= p[0];
return u;
}
/** /**
* Read a 32 bits big endian unsigned integer out of memory. * Read a 32 bits big endian unsigned integer out of memory.
* @param x a pointer to the input memory * @param x a pointer to the input memory
@ -499,6 +516,23 @@ static inline uint32_t read_u32be_inc(const uint8_t **p)
return v; return v;
} }
/**
* Read unsigned 24bit integer from raw memory (little endian format), increment read position.
* @param[in, out] p Pointer into byte stream.
* @return Retrieved integer value, unsigned.
*/
static inline uint32_t read_u24le_inc(const uint8_t **p)
{
uint32_t v;
if (!p || !*p)
return 0;
v = read_u24le(*p);
*p += 3 * sizeof(uint8_t);
return v;
}
/** /**
* Read unsigned 32bit integer from raw memory (little endian format), increment read position. * Read unsigned 32bit integer from raw memory (little endian format), increment read position.
* @param[in, out] p Pointer into byte stream. * @param[in, out] p Pointer into byte stream.