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improve buf_cpy helper 

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
View File

@ -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; return NULL;
for (unsigned i = 0, num_bytes = CEIL(size, 8); i < num_bytes; i++) // copy entire buffer
to[i] = from[i]; memcpy(_to, from, CEIL(size, 8));
/* mask out bits that don't belong to the buffer */ /* 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) static bool buf_cmp_masked(uint8_t a, uint8_t b, uint8_t m)

3
src/helper/binarybuffer.h
View File

@ -73,7 +73,8 @@ uint32_t flip_u32(uint32_t value, unsigned int num);
bool buf_cmp(const void *buf1, const void *buf2, unsigned size); bool buf_cmp(const void *buf1, const void *buf2, unsigned size);
bool buf_cmp_mask(const void *buf1, const void *buf2, bool buf_cmp_mask(const void *buf1, const void *buf2,
const void *mask, unsigned size); const void *mask, unsigned size);
uint8_t* buf_cpy(const uint8_t *from, uint8_t *to, int size);
void* buf_cpy(const void *from, void *to, unsigned size);
uint8_t* buf_set_ones(uint8_t *buf, int count); uint8_t* buf_set_ones(uint8_t *buf, int count);
uint8_t* buf_set_buf(const uint8_t *src, int src_start, uint8_t* buf_set_buf(const uint8_t *src, int src_start,