49 lines
1.4 KiB
JavaScript
49 lines
1.4 KiB
JavaScript
'use strict';
|
|
|
|
function Encoding(servicePrefix) {
|
|
this._servicePrefix = servicePrefix;
|
|
this._blockPrefix = new Buffer('00', 'hex');
|
|
this._timestampPrefix = new Buffer('01', 'hex');
|
|
}
|
|
|
|
// ---- block hash -> timestamp
|
|
Encoding.prototype.encodeBlockTimestampKey = function(hash) {
|
|
return Buffer.concat([this._servicePrefix, this._blockPrefix, new Buffer(hash, 'hex')]);
|
|
};
|
|
|
|
Encoding.prototype.decodeBlockTimestampKey = function(buffer) {
|
|
return buffer.slice(3).toString('hex');
|
|
};
|
|
|
|
Encoding.prototype.encodeBlockTimestampValue = function(timestamp) {
|
|
var timestampBuffer = new Buffer(new Array(8));
|
|
timestampBuffer.writeDoubleBE(timestamp);
|
|
return timestampBuffer;
|
|
};
|
|
|
|
Encoding.prototype.decodeBlockTimestampValue = function(buffer) {
|
|
return buffer.readDoubleBE();
|
|
};
|
|
|
|
|
|
// ---- timestamp -> block hash
|
|
Encoding.prototype.encodeTimestampBlockKey = function(timestamp) {
|
|
var timestampBuffer = new Buffer(new Array(8));
|
|
timestampBuffer.writeDoubleBE(timestamp);
|
|
return Buffer.concat([this._servicePrefix, this._timestampPrefix, timestampBuffer]);
|
|
};
|
|
|
|
Encoding.prototype.decodeTimestampBlockKey = function(buffer) {
|
|
return buffer.readDoubleBE(3);
|
|
};
|
|
|
|
Encoding.prototype.encodeTimestampBlockValue = function(hash) {
|
|
return new Buffer(hash, 'hex');
|
|
};
|
|
|
|
Encoding.prototype.decodeTimestampBlockValue = function(buffer) {
|
|
return buffer.toString('hex');
|
|
};
|
|
|
|
module.exports = Encoding;
|