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Simplify target generation code.

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This commit is contained in:
Con Kolivas 2012-10-11 19:31:24 +11:00
parent 7f522ef83c
commit 5ed6e9d55e
1 changed files with 7 additions and 3 deletions
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cgminer.c
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@ -4530,15 +4530,19 @@ static void gen_hash(unsigned char *data, unsigned char *hash, int len)
sha2(hash1, 32, hash, false); sha2(hash1, 32, hash, false);
} }
/* Diff 1 is a 256 bit unsigned integer of
* 0x00000000ffff0000000000000000000000000000000000000000000000000000
* so we use a big endian 64 bit unsigned integer centred on the 5th byte to
* cover a huge range of difficulty targets, though not all 256 bits' worth */
static void set_work_target(struct work *work, int diff) static void set_work_target(struct work *work, int diff)
{ {
unsigned char rtarget[33], target[33]; unsigned char rtarget[33], target[33];
uint64_t *data64, h64; uint64_t *data64, h64;
hex2bin(rtarget, "00000000ffff0000000000000000000000000000000000000000000000000000", 32); h64 = 0xFFFF000000000000ull;
data64 = (uint64_t *)(rtarget + 4);
h64 = be64toh(*data64);
h64 /= (uint64_t)diff; h64 /= (uint64_t)diff;
memset(rtarget, 0, 32);
data64 = (uint64_t *)(rtarget + 4);
*data64 = htobe64(h64); *data64 = htobe64(h64);
swab256(target, rtarget); swab256(target, rtarget);
if (opt_debug) { if (opt_debug) {