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improve buf_cpy helper

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Use memcpy for bulk of copy, improve final byte handling.
Improve types by using void * for buffers and unsigned for size.
This commit is contained in:
Zachary T Welch
2009-11-14 10:36:57 -08:00
parent e4ee891759
commit d09e308130
2 changed files with 11 additions and 9 deletions
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17
src/helper/binarybuffer.c
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@@ -48,21 +48,22 @@ const unsigned char bit_reverse_table256[] =
};
uint8_t* buf_cpy(const uint8_t *from, uint8_t *to, int size)
void* buf_cpy(const void *from, void *_to, unsigned size)
{
if (from == NULL)
if (NULL == from || NULL == _to)
return NULL;
for (unsigned i = 0, num_bytes = CEIL(size, 8); i < num_bytes; i++)
to[i] = from[i];
// copy entire buffer
memcpy(_to, from, CEIL(size, 8));
/* mask out bits that don't belong to the buffer */
if (size % 8)
unsigned trailing_bits = size % 8;
if (trailing_bits)
{
to[size / 8] &= (0xff >> (8 - (size % 8)));
uint8_t *to = _to;
to[size / 8] &= (1 << trailing_bits) - 1;
}
return to;
return _to;
}
static bool buf_cmp_masked(uint8_t a, uint8_t b, uint8_t m)