66 lines
1.6 KiB
JavaScript
66 lines
1.6 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.hashPrefix = new Buffer('01', 'hex');
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this.heightPrefix = new Buffer('02', 'hex');
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}
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// ---- hash --> block
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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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// ---- hash --> header
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Encoding.prototype.encodeHashKey = function(hash) {
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var hashBuf = new Buffer(hash, 'hex');
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return Buffer.concat([ this.servicePrefix, this.hashPrefix, hashBuf ]);
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};
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Encoding.prototype.decodeHashKey = function(buffer) {
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return buffer.slice(3).toString('hex');
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};
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Encoding.prototype.encodeHeaderValue = function(header) {
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return new Buffer(JSON.stringify(header), 'utf8');
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};
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Encoding.prototype.decodeHeaderValue = function(buffer) {
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return JSON.parse(buffer.toString('utf8'));
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};
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// ---- height --> header
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Encoding.prototype.encodeHeightKey = 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.heightPrefix, heightBuf ]);
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};
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Encoding.prototype.decodeHeightKey = function(buffer) {
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return buffer.readUInt32BE(3);
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};
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module.exports = Encoding;
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