119 lines
3.5 KiB
JavaScript
119 lines
3.5 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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Encoding.prototype.encodeAddressIndexKey = function(address, height, txid, index, input, timestamp) {
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var prefix = new Buffer('00', 'hex');
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var buffers = [this.servicePrefix, prefix];
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var addressSizeBuffer = new Buffer(1);
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addressSizeBuffer.writeUInt8(address.length);
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var addressBuffer = new Buffer(address, 'utf8');
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buffers.push(addressSizeBuffer);
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buffers.push(addressBuffer);
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var heightBuffer = new Buffer(4);
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heightBuffer.writeUInt32BE(height || 0);
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buffers.push(heightBuffer);
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var txidBuffer = new Buffer(txid || Array(65).join('0'), 'hex');
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buffers.push(txidBuffer);
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var indexBuffer = new Buffer(4);
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indexBuffer.writeUInt32BE(index || 0);
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buffers.push(indexBuffer);
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// this is whether the address appears in an input (1) or output (0)
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var inputBuffer = new Buffer(1);
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inputBuffer.writeUInt8(input || 0);
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buffers.push(inputBuffer);
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var timestampBuffer = new Buffer(4);
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timestampBuffer.writeUInt32BE(timestamp || 0);
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buffers.push(timestampBuffer);
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return Buffer.concat(buffers);
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};
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Encoding.prototype.decodeAddressIndexKey = function(buffer) {
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var addressSize = buffer.readUInt8(3);
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var address = buffer.slice(4, addressSize + 4).toString('utf8');
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var height = buffer.readUInt32BE(addressSize + 4);
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var txid = buffer.slice(addressSize + 8, addressSize + 40).toString('hex');
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var index = buffer.readUInt32BE(addressSize + 40);
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var input = buffer.readUInt8(addressSize + 44);
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var timestamp = buffer.readUInt32BE(addressSize + 45);
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return {
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address: address,
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height: height,
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txid: txid,
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index: index,
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input: input,
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timestamp: timestamp
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};
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};
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Encoding.prototype.encodeUtxoIndexKey = function(address, txid, outputIndex) {
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var prefix = new Buffer('01', 'hex');
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var buffers = [this.servicePrefix, prefix];
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var addressSizeBuffer = new Buffer(1);
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addressSizeBuffer.writeUInt8(address.length);
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var addressBuffer = new Buffer(address, 'utf8');
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buffers.push(addressSizeBuffer);
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buffers.push(addressBuffer);
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var txidBuffer = new Buffer(txid || new Array(65).join('0'), 'hex');
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buffers.push(txidBuffer);
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var outputIndexBuffer = new Buffer(4);
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outputIndexBuffer.writeUInt32BE(outputIndex || 0);
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buffers.push(outputIndexBuffer);
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return Buffer.concat(buffers);
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};
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Encoding.prototype.decodeUtxoIndexKey = function(buffer) {
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var addressSize = buffer.readUInt8(3);
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var address = buffer.slice(4, addressSize + 4).toString('utf8');
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var txid = buffer.slice(addressSize + 4, addressSize + 36).toString('hex');
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var outputIndex = buffer.readUInt32BE(addressSize + 36);
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return {
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address: address,
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txid: txid,
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outputIndex: outputIndex
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};
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};
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Encoding.prototype.encodeUtxoIndexValue = function(height, satoshis, timestamp, scriptBuffer) {
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var heightBuffer = new Buffer(4);
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heightBuffer.writeUInt32BE(height);
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var satoshisBuffer = new Buffer(8);
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satoshisBuffer.writeDoubleBE(satoshis);
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var timestampBuffer = new Buffer(8);
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timestampBuffer.writeUInt32BE(timestamp || 0)
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return Buffer.concat([heightBuffer, satoshisBuffer, timestampBuffer, scriptBuffer]);
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};
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Encoding.prototype.decodeUtxoIndexValue = function(buffer) {
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var height = buffer.readUInt32BE();
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var satoshis = buffer.readDoubleBE(4);
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var timestamp = buffer.readDoubleBE(8);
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var scriptBuffer = buffer.slice(12);
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return {
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height: height,
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satoshis: satoshis,
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timestamp: timestamp,
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script: scriptBuffer
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};
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};
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module.exports = Encoding;
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