Block

lib/block.js

@@ -0,0 +1,67 @@
+var Transaction = require('./transaction');
+var BufferReader = require('./bufferreader');
+var BufferWriter = require('./bufferwriter');
+var Blockheader = require('./blockheader');
+var Varint = require('./varint');
+
+var Block = function Block(magicnum, blocksize, blockheader, txsvarint, txs) {
+  if (!(this instanceof Block))
+    return new Block(magicnum, blocksize, blockheader, txsvarint, txs);
+  if (typeof magicnum === 'number') {
+    this.set({
+      magicnum: magicnum,
+      blocksize: blocksize,
+      blockheader: blockheader,
+      txsvarint: txsvarint,
+      txs: txs
+    });
+  } else if (magicnum) {
+    var obj = magicnum;
+  }
+};
+
+Block.prototype.set = function(obj) {
+  this.magicnum = typeof obj.magicnum !== 'undefined' ? obj.magicnum : this.magicnum;
+  this.blocksize = typeof obj.blocksize !== 'undefined' ? obj.blocksize : this.blocksize;
+  this.blockheader = obj.blockheader || this.blockheader;
+  this.txsvarint = obj.txsvarint || this.txsvarint;
+  this.txs = obj.txs || this.txs;
+  return this;
+};
+
+Block.prototype.fromBuffer = function(buf) {
+  return this.fromBufferReader(BufferReader(buf));
+};
+
+Block.prototype.fromBufferReader = function(br) {
+  this.magicnum = br.readUInt32LE();
+  this.blocksize = br.readUInt32LE();
+  this.blockheader = Blockheader().fromBufferReader(br);
+  this.txsvarint = Varint(br.readVarintBuf());
+  var txslen = this.txsvarint.toNumber();
+  this.txs = [];
+  for (var i = 0; i < txslen; i++) {
+    this.txs.push(Transaction().fromBufferReader(br));
+  }
+  return this;
+};
+
+Block.prototype.toBuffer = function() {
+  return this.toBufferWriter().concat();
+};
+
+Block.prototype.toBufferWriter = function(bw) {
+  if (!bw)
+    bw = new BufferWriter();
+  bw.writeUInt32LE(this.magicnum);
+  bw.writeUInt32LE(this.blocksize);
+  bw.write(this.blockheader.toBuffer());
+  bw.write(this.txsvarint.buf);
+  var txslen = this.txsvarint.toNumber();
+  for (var i = 0; i < txslen; i++) {
+    this.txs[i].toBufferWriter(bw);
+  }
+  return bw;
+};
+
+module.exports = Block;

test/block.js

@@ -0,0 +1,94 @@
+var Blockheader = require('../lib/blockheader');
+var Block = require('../lib/block');
+var BufferWriter = require('../lib/bufferwriter');
+var BufferReader = require('../lib/bufferreader');
+var Varint = require('../lib/varint');
+var should = require('chai').should();
+var Transaction = require('../lib/transaction');
+
+describe('Block', function() {
+  
+  it('should make a new block', function() {
+    var block = new Block();
+    should.exist(block);
+    block = Block();
+    should.exist(block);
+  });
+
+  var txidhex = '8c9aa966d35bfeaf031409e0001b90ccdafd8d859799eb945a3c515b8260bcf2';
+  var txhex = '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';
+  var txbuf = new Buffer(txhex, 'hex');
+  var tx = Transaction().fromBuffer(txbuf);
+  var magicnum = 0xd9b4bef9;
+  var blocksize = 50;
+  bhhex = '0100000005050505050505050505050505050505050505050505050505050505050505050909090909090909090909090909090909090909090909090909090909090909020000000300000004000000';
+  bhbuf = new Buffer(bhhex, 'hex');
+  var bh = Blockheader().fromBuffer(bhbuf);
+  var txsvarint = Varint(1);
+  var txs = [Transaction().fromBuffer(txbuf)];
+  var block = Block().set({
+    magicnum: magicnum,
+    blocksize: blocksize,
+    blockheader: bh,
+    txsvarint: txsvarint,
+    txs: txs
+  });
+  var blockhex = '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';
+  var blockbuf = new Buffer(blockhex, 'hex');
+
+  describe('#set', function() {
+
+    it('should set these known values', function() {
+      var block = Block().set({
+        magicnum: magicnum,
+        blocksize: blocksize,
+        blockheader: bh,
+        txsvarint: txsvarint,
+        txs: txs
+      });
+      should.exist(block.magicnum);
+      should.exist(block.blocksize);
+      should.exist(block.blockheader);
+      should.exist(block.txsvarint);
+      should.exist(block.txs);
+    });
+    
+  });
+
+  describe('#fromBuffer', function() {
+    
+    it('should make a block from this known buffer', function() {
+      var block = Block().fromBuffer(blockbuf);
+      block.toBuffer().toString('hex').should.equal(blockhex);
+    });
+
+  });
+
+  describe('#fromBufferReader', function() {
+    
+    it('should make a block from this known buffer', function() {
+      var block = Block().fromBufferReader(BufferReader(blockbuf));
+      block.toBuffer().toString('hex').should.equal(blockhex);
+    });
+
+  });
+
+  describe('#toBuffer', function() {
+    
+    it('should recover a block from this known buffer', function() {
+      var block = Block().fromBuffer(blockbuf);
+      block.toBuffer().toString('hex').should.equal(blockhex);
+    });
+
+  });
+
+  describe('#toBufferWriter', function() {
+    
+    it('should recover a block from this known buffer', function() {
+      var block = Block().fromBuffer(blockbuf);
+      block.toBufferWriter().concat().toString('hex').should.equal(blockhex);
+    });
+
+  });
+
+});