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char sz[] = "2ad5f6e5";
unsigned char hex[4];
size_t len = strlen(sz);
size_t j = 0;
BYTE c;
for (size_t i = 0; i < len; i += 2)
{
c = sz[i];
if (c >= '0' && c <= '9') hex[j] = (c - '0') << 4;
else if (c >= 'a' && c <= 'f') hex[j] = (c - 'a' + 10) << 4;
c = sz[i + 1];
if (c >= '0' && c <= '9') hex[j++] |= (c - '0');
else if (c >= 'a' && c <= 'f') hex[j++] |= (c - 'a' + 10);
}