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writeu64n

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This commit is contained in:
Christopher Jeffrey 2016-03-24 17:16:07 -07:00
parent 6ce950d081
commit 2a75a39849
1 changed files with 114 additions and 0 deletions
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114
lib/bcoin/utils.js
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@ -1241,6 +1241,120 @@ utils.writeU64BE = function writeU64BE(dst, num, off) {
return 8;
};
utils.writeU64N = function writeU64N(dst, num, off) {
return utils.write64N(dst, num, off);
};
utils.writeU64NBE = function writeU64NBE(dst, num, off) {
return utils.write64NBE(dst, num, off);
};
utils.write64N = function write64N(dst, num, off) {
var neg, hi, lo, one, i, b;
off = off >>> 0;
if (num < 0)
neg = true;
num = num < 0 ? -num : num;
hi = num / 0x100000000 | 0;
lo = num % 0x100000000;
dst[off + 0] = (lo >>> 0) & 0xff;
dst[off + 1] = (lo >>> 8) & 0xff;
dst[off + 2] = (lo >>> 16) & 0xff;
dst[off + 3] = (lo >>> 24) & 0xff;
dst[off + 4] = (hi >>> 0) & 0xff;
dst[off + 5] = (hi >>> 8) & 0xff;
dst[off + 6] = (hi >>> 16) & 0xff;
dst[off + 7] = (hi >>> 24) & 0xff;
if (neg) {
one = 1;
for (i = off; i < off + 8; i++) {
b = (dst[i] ^ 0xff) + one;
dst[i] = b & 0xff;
one = b >>> 8;
}
}
return 8;
};
utils.write64NBE = function write64NBE(dst, num, off) {
var neg, hi, lo, one, i, b;
off = off >>> 0;
if (num < 0)
neg = true;
num = num < 0 ? -num : num;
hi = num / 0x100000000 | 0;
lo = num % 0x100000000;
dst[off + 7] = (lo >>> 0) & 0xff;
dst[off + 6] = (lo >>> 8) & 0xff;
dst[off + 5] = (lo >>> 16) & 0xff;
dst[off + 4] = (lo >>> 24) & 0xff;
dst[off + 3] = (hi >>> 0) & 0xff;
dst[off + 2] = (hi >>> 8) & 0xff;
dst[off + 1] = (hi >>> 16) & 0xff;
dst[off + 0] = (hi >>> 24) & 0xff;
if (neg) {
one = 1;
for (i = off + 7; i >= off; i--) {
b = (dst[i] ^ 0xff) + one;
dst[i] = b & 0xff;
one = b >>> 8;
}
}
return 8;
};
utils.readU64N = function readU64N(dst, off) {
off = off >>> 0;
var hi = utils.readU32(dst, off + 4);
var lo = utils.readU32(dst, off);
return (hi * 0x100000000) + lo;
};
utils.readU64NBE = function readU64NBE(dst, off) {
off = off >>> 0;
var hi = utils.readU32BE(dst, off);
var lo = utils.readU32BE(dst, off + 4);
return (hi * 0x100000000) + lo;
};
utils.read64N = function read64N(dst, off) {
off = off >>> 0;
var hi = utils.readU32(dst, off + 4);
var lo = utils.readU32(dst, off);
if (hi & 0x80000000) {
hi = ~hi + 1;
lo = ~lo + 1;
return -(hi * 0x100000000 + lo);
}
return (hi * 0x100000000) + lo;
};
utils.read64NBE = function read64NBE(dst, off) {
off = off >>> 0;
var hi = utils.readU32BE(dst, off);
var lo = utils.readU32BE(dst, off + 4);
if (hi & 0x80000000) {
hi = ~hi + 1;
lo = ~lo + 1;
return -(hi * 0x100000000 + lo);
}
return (hi * 0x100000000) + lo;
};
utils.writeU256 = function writeU256(dst, num, off) {
var i;