54 lines
1.5 KiB
JavaScript
54 lines
1.5 KiB
JavaScript
'use strict';
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var Block = require('bitcore-lib').Block;
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// stores -- block header as key, block itself as value (optionally)
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function Encoding(servicePrefix) {
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this._servicePrefix = servicePrefix;
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this._blockPrefix = new Buffer('00', 'hex');
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this._metaPrefix = new Buffer('01', 'hex');
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}
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// ---- hash --> rawblock
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Encoding.prototype.encodeBlockKey = function(hash) {
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return Buffer.concat([ this._servicePrefix, this._blockPrefix, new Buffer(hash, 'hex') ]);
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};
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Encoding.prototype.decodeBlockKey = function(buffer) {
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return buffer.slice(3).toString('hex');
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};
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Encoding.prototype.encodeBlockValue = function(block) {
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return block.toBuffer();
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};
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Encoding.prototype.decodeBlockValue = function(buffer) {
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return Block.fromBuffer(buffer);
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};
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// ---- height --> hash, chainwork
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Encoding.prototype.encodeMetaKey = function(height) {
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var heightBuf = new Buffer(4);
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heightBuf.writeUInt32BE(height);
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return Buffer.concat([ this._servicePrefix, this._metaPrefix, heightBuf ]);
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};
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Encoding.prototype.decodeMetaKey = function(buffer) {
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return buffer.readUInt32BE(3);
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};
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Encoding.prototype.encodeMetaValue = function(value) {
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// { chainwork: hex-string, hash: hex-string }
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return Buffer.concat([ new Buffer(value.hash, 'hex'), new Buffer(value.chainwork, 'hex') ]);
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};
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Encoding.prototype.decodeMetaValue = function(buffer) {
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return {
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hash: buffer.slice(0, 32).toString('hex'),
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chainwork: buffer.slice(32).toString('hex')
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};
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};
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module.exports = Encoding;
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