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Code Issues Releases Wiki Activity

allow brev() in-place

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This commit is contained in:
John Reiser 2006-06-14 20:21:39 -07:00
commit ebed0b9f20
1 changed files with 9 additions and 5 deletions
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14
src/p_lx_elf.cpp
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@ -572,12 +572,16 @@ static void brev(
)
{
assert(0==(3 & len));
assert(!((src -4)<=dst && dst < (len + src)));
// Detect overlap which over-writes src before it is used.
assert(!((4+ src)<=dst && dst < (len + src)));
for (unsigned j = 0; j < len; j += 4) {
dst[0+ j] = src[3+ j];
dst[1+ j] = src[2+ j];
dst[2+ j] = src[1+ j];
dst[3+ j] = src[0+ j];
// Simple way (and somewhat slow) to allow in-place brev().
unsigned char tmp[4];
memcpy(tmp, j + src, 4);
dst[0+ j] = tmp[3];
dst[1+ j] = tmp[2];
dst[2+ j] = tmp[1];
dst[3+ j] = tmp[0];
}
}