69 lines
2.0 KiB
JavaScript
69 lines
2.0 KiB
JavaScript
'use strict';
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function Encoding(servicePrefix) {
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this._servicePrefix = servicePrefix;
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}
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// ---- hash --> header
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Encoding.prototype.encodeHeaderKey = function(height, hash) {
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var heightBuf = new Buffer(4);
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heightBuf.writeUInt32BE(height);
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var hashBuf = new Buffer(hash || new Array(65).join('0'), 'hex');
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return Buffer.concat([ this._servicePrefix, heightBuf, hashBuf ]);
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};
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Encoding.prototype.decodeHeaderKey = function(buffer) {
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var height = buffer.readUInt32BE(2);
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return {
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height: height,
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hash: buffer.slice(6).toString('hex')
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};
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};
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Encoding.prototype.encodeHeaderValue = function(header) {
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var hashBuf = new Buffer(header.hash, 'hex');
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var versionBuf = new Buffer(4);
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versionBuf.writeInt32BE(header.version);
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var prevHash = new Buffer(header.prevHash, 'hex');
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var merkleRoot = new Buffer(header.merkleRoot, 'hex');
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var tsBuf = new Buffer(4);
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tsBuf.writeUInt32BE(header.timestamp);
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var bitsBuf = new Buffer(4);
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bitsBuf.writeUInt32BE(header.bits);
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var nonceBuf = new Buffer(4);
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nonceBuf.writeUInt32BE(header.nonce);
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var heightBuf = new Buffer(4);
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heightBuf.writeUInt32BE(header.height);
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var chainworkBuf = new Buffer(header.chainwork, 'hex');
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return Buffer.concat([hashBuf, versionBuf, prevHash.reverse(), merkleRoot.reverse(), tsBuf, bitsBuf, nonceBuf, heightBuf, chainworkBuf ]);
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};
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Encoding.prototype.decodeHeaderValue = function(buffer) {
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var hash = buffer.slice(0, 32).toString('hex');
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var version = buffer.readInt32BE(32);
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var prevHash = buffer.slice(36, 68).toString('hex');
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var merkleRoot = buffer.slice(68, 100).toString('hex');
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var ts = buffer.readUInt32BE(100);
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var bits = buffer.readUInt32BE(104);
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var nonce = buffer.readUInt32BE(108);
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var height = buffer.readUInt32BE(112);
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var chainwork = buffer.slice(116).toString('hex');
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return {
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hash: hash,
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version: version,
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prevHash: prevHash,
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merkleRoot: merkleRoot,
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timestamp: ts,
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bits: bits,
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nonce: nonce,
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height: height,
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chainwork: chainwork
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};
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};
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module.exports = Encoding;
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