RanchiMall/fcoin
3
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

protobuf: optimize varint reading.

Browse Source
This commit is contained in:
Christopher Jeffrey 2016-07-23 04:25:51 -07:00
parent 5dbebe14d9
commit 0cbae18f1f
No known key found for this signature in database
GPG Key ID: 8962AB9DE6666BBD
1 changed files with 20 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
lib/bcoin/bip70/protobuf.js
View File

@ -160,18 +160,20 @@ ProtoWriter.prototype.writeVarint = function writeVarint(num) {
this.writeBytes(buf);
};
ProtoWriter.prototype.writeFieldValue = function writeFieldValue(tag, value) {
ProtoWriter.prototype.writeFieldVarint = function writeFieldVarint(tag, value) {
var header = (tag << 3) | wireType.VARINT;
this.writeVarint(header);
this.writeVarint(value);
};
ProtoWriter.prototype.writeFieldU64 = function writeFieldU64(tag, value) {
this.writeFieldValue(tag, value);
assert(utils.isSafeInteger(value));
this.writeFieldVarint(tag, value);
};
ProtoWriter.prototype.writeFieldU32 = function writeFieldU32(tag, value) {
this.writeFieldValue(tag, value);
assert(value <= 0xffffffff);
this.writeFieldVarint(tag, value);
};
ProtoWriter.prototype.writeFieldBytes = function writeFieldBytes(tag, data) {
@ -199,7 +201,21 @@ exports.readVarint = function readVarint(data, off) {
}
ch = data[off++];
assert(size + 1 < 6, 'Number exceeds 2^53-1.');
num += (ch & 0x7f) * Math.pow(2, 7 * size);
// Optimization for javascript insanity.
switch (size) {
case 0:
case 1:
case 2:
case 3:
num += (ch & 0x7f) << (7 * size);
break;
case 4:
num += (ch & 0x7f) * (1 << (7 * size));
break;
default:
num += (ch & 0x7f) * Math.pow(2, 7 * size);
break;
}
size++;
}