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util: perhaps a more clever way of U64 writes using bn.js.

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Signed-off-by: Fedor Indutny <fedor@indutny.com>
This commit is contained in:
Christopher Jeffrey 2014-05-18 10:37:00 -05:00 committed by Fedor Indutny
parent ca2609b7e7
commit 84b53a049d
1 changed files with 10 additions and 32 deletions
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42
lib/bcoin/utils.js
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@ -180,23 +180,12 @@ utils.writeU64 = function writeU64(dst, num, off) {
if (!off) if (!off)
off = 0; off = 0;
var num = new bn(num); num = new bn(num).maskn(64).toArray();
while (num.length < 8) num.unshift(0);
var left = num.shrn(32).toArray(); num.reverse().forEach(function(ch) {
while (left.length < 4) left.unshift(0); dst[off++] = ch;
});
var right = num.maskn(32).toArray();
while (right.length < 4) right.unshift(0);
dst[off] = right[3];
dst[off + 1] = right[2];
dst[off + 2] = right[1];
dst[off + 3] = right[0];
dst[off + 4] = left[3];
dst[off + 5] = left[2];
dst[off + 6] = left[1];
dst[off + 7] = left[0];
return 8; return 8;
}; };
@ -223,23 +212,12 @@ utils.writeU64BE = function writeU64BE(dst, num, off) {
if (!off) if (!off)
off = 0; off = 0;
var num = new bn(num); num = new bn(num).maskn(64).toArray();
while (num.length < 8) num.unshift(0);
var left = num.shrn(32).toArray(); num.forEach(function(ch) {
while (left.length < 4) left.unshift(0); dst[off++] = ch;
});
var right = num.maskn(32).toArray();
while (right.length < 4) right.unshift(0);
dst[off] = left[0];
dst[off + 1] = left[1];
dst[off + 2] = left[2];
dst[off + 3] = left[3];
dst[off + 4] = right[0];
dst[off + 5] = right[1];
dst[off + 6] = right[2];
dst[off + 7] = right[3];
return 8; return 8;
}; };