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mangle: simpler MemSwap, w/o malloc()

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This commit is contained in:
Robert Swiecki
2020-08-10 14:18:39 +02:00
parent ae38d1df71
commit 38bb488ab9
1 changed files with 18 additions and 9 deletions
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mangle.c
+18 -9
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@@ -158,21 +158,30 @@ static inline void mangle_UseValue(run_t* run, const uint8_t* val, size_t len, b
}
static void mangle_MemSwap(run_t* run, bool printable HF_ATTR_UNUSED) {
/* No big deal if those two are overlapping */
size_t off1 = mangle_getOffSet(run);
size_t maxlen1 = run->dynfile->size - off1;
size_t off2 = mangle_getOffSet(run);
size_t maxlen2 = run->dynfile->size - off2;
size_t len = mangle_getLen(HF_MIN(maxlen1, maxlen2));
size_t len = mangle_getLen(HF_MIN(maxlen1, maxlen2));
uint8_t* tmpbuf = (uint8_t*)util_Malloc(len);
defer {
free(tmpbuf);
};
if (off1 == off2) {
return;
}
memcpy(tmpbuf, &run->dynfile->data[off1], len);
memmove(&run->dynfile->data[off1], &run->dynfile->data[off2], len);
memcpy(&run->dynfile->data[off2], tmpbuf, len);
for (size_t i = 0; i < (len / 2); i++) {
/*
* First - from the head, next from the tail. Don't worry about layout of the overlapping
* part - there's no good solution to that, ond it can be left somewhat scrambled,
* still preserving the entropy
*/
const uint8_t tmp1 = run->dynfile->data[off2 + i];
run->dynfile->data[off2 + i] = run->dynfile->data[off1 + i];
run->dynfile->data[off1 + i] = tmp1;
const uint8_t tmp2 = run->dynfile->data[off2 + len - (i + 1)];
run->dynfile->data[off2 + len - (i + 1)] = run->dynfile->data[off1 + len - (i + 1)];
run->dynfile->data[off1 + len - (i + 1)] = tmp2;
}
}
static void mangle_MemCopy(run_t* run, bool printable HF_ATTR_UNUSED) {