RanchiMall/fcoin
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do not allow negative compact numbers.

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This commit is contained in:
Christopher Jeffrey 2016-05-05 01:16:14 -07:00
parent 4802f409ca
commit 019617162c
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GPG Key ID: 8962AB9DE6666BBD
1 changed files with 14 additions and 6 deletions
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20
lib/bcoin/utils.js
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@ -1091,16 +1091,18 @@ utils.uniq = function uniq(obj) {
*/ */
utils.fromCompact = function fromCompact(compact) { utils.fromCompact = function fromCompact(compact) {
var exponent = compact >> 24; var exponent = compact >>> 24;
var negative = (compact >> 23) & 0x01; var negative = (compact >>> 23) & 1;
var mantissa = compact & 0x007fffff; var mantissa = compact & 0x7fffff;
var num; var num;
if (compact === 0) if (compact === 0)
return new bn(0); return new bn(0);
// Logic ported from btcd since
// the bitcoind code is a nightmare.
if (exponent <= 3) { if (exponent <= 3) {
mantissa >>= 8 * (3 - exponent); mantissa >>>= 8 * (3 - exponent);
num = new bn(mantissa); num = new bn(mantissa);
} else { } else {
num = new bn(mantissa); num = new bn(mantissa);
@ -1127,6 +1129,9 @@ utils.toCompact = function toCompact(num) {
return 0; return 0;
exponent = num.byteLength(); exponent = num.byteLength();
// Logic ported from btcd since
// the bitcoind code is a nightmare.
if (exponent <= 3) { if (exponent <= 3) {
mantissa = num.toNumber(); mantissa = num.toNumber();
mantissa <<= 8 * (3 - exponent); mantissa <<= 8 * (3 - exponent);
@ -1134,7 +1139,7 @@ utils.toCompact = function toCompact(num) {
mantissa = num.ushrn(8 * (exponent - 3)).toNumber(); mantissa = num.ushrn(8 * (exponent - 3)).toNumber();
} }
if (mantissa & 0x00800000) { if (mantissa & 0x800000) {
mantissa >>= 8; mantissa >>= 8;
exponent++; exponent++;
} }
@ -1142,7 +1147,10 @@ utils.toCompact = function toCompact(num) {
compact = (exponent << 24) | mantissa; compact = (exponent << 24) | mantissa;
if (num.isNeg()) if (num.isNeg())
compact |= 0x00800000; compact |= 0x800000;
if (compact < 0)
compact += 0x100000000;
return compact; return compact;
}; };