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script.toBuffer();

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This commit is contained in:
Ryan X. Charles 2014-09-01 18:01:17 -07:00
parent 378dc923ef
commit e6af57f4fa
3 changed files with 100 additions and 5 deletions
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1
README.md
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@ -46,3 +46,4 @@ Features over bitcore:
* Better test coverage * Better test coverage
* Proper message signing and verification * Proper message signing and verification
* npm-shrinkwrap.json ensures npm install works as intended * npm-shrinkwrap.json ensures npm install works as intended
* byte-for-byte reading/writing scripts

30
lib/script.js
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@ -1,4 +1,5 @@
var BufferReader = require('./bufferreader'); var BufferReader = require('./bufferreader');
var BufferWriter = require('./bufferwriter');
var Opcode = require('./opcode'); var Opcode = require('./opcode');
var Script = function Script(buf) { var Script = function Script(buf) {
@ -75,14 +76,33 @@ Script.prototype.fromBuffer = function(buf) {
Script.prototype.toBuffer = function() { Script.prototype.toBuffer = function() {
var bw = new BufferWriter(); var bw = new BufferWriter();
for (var key in this.chunks) { for (var i = 0; i < this.chunks.length; i++) {
if (this.chunks.hasOwnProperty(key)) { var chunk = this.chunks[i];
var chunk = this.chunks[key]; if (typeof chunk === 'number') {
if (typeof chunk === 'number') { var opcodenum = chunk;
bw.writeUInt8(opcodenum);
} else {
var opcodenum = chunk.opcodenum;
bw.writeUInt8(chunk.opcodenum);
if (opcodenum < Opcode.map.OP_PUSHDATA1) {
bw.write(chunk.buf);
}
else if (opcodenum === Opcode.map.OP_PUSHDATA1) {
bw.writeUInt8(chunk.len);
bw.write(chunk.buf);
}
else if (opcodenum === Opcode.map.OP_PUSHDATA2) {
bw.writeUInt16LE(chunk.len);
bw.write(chunk.buf);
}
else if (opcodenum === Opcode.map.OP_PUSHDATA4) {
bw.writeUInt32LE(chunk.len);
bw.write(chunk.buf);
} }
} }
} }
return bw.concat();
}; };
module.exports = Script; module.exports = Script;

74
test/script.js
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@ -77,4 +77,78 @@ describe('Script', function() {
}); });
describe('#toBuffer', function() {
it('should output this buffer containing an OP code', function() {
var buf = new Buffer(1);
buf[0] = Opcode('OP_0').toNumber();
var script = Script().fromBuffer(buf);
script.chunks.length.should.equal(1);
script.chunks[0].should.equal(buf[0]);
script.toBuffer().toString('hex').should.equal(buf.toString('hex'));
});
it('should output this buffer containing another OP code', function() {
var buf = new Buffer(1);
buf[0] = Opcode('OP_CHECKMULTISIG').toNumber();
var script = Script().fromBuffer(buf);
script.chunks.length.should.equal(1);
script.chunks[0].should.equal(buf[0]);
script.toBuffer().toString('hex').should.equal(buf.toString('hex'));
});
it('should output this buffer containing three bytes of data', function() {
var buf = new Buffer([3, 1, 2, 3]);
var script = Script().fromBuffer(buf);
script.chunks.length.should.equal(1);
script.chunks[0].buf.toString('hex').should.equal('010203');
script.toBuffer().toString('hex').should.equal(buf.toString('hex'));
});
it('should output this buffer containing OP_PUSHDATA1 and three bytes of data', function() {
var buf = new Buffer([0, 0, 1, 2, 3]);
buf[0] = Opcode('OP_PUSHDATA1').toNumber();
buf.writeUInt8(3, 1);
var script = Script().fromBuffer(buf);
script.chunks.length.should.equal(1);
script.chunks[0].buf.toString('hex').should.equal('010203');
script.toBuffer().toString('hex').should.equal(buf.toString('hex'));
});
it('should output this buffer containing OP_PUSHDATA2 and three bytes of data', function() {
var buf = new Buffer([0, 0, 0, 1, 2, 3]);
buf[0] = Opcode('OP_PUSHDATA2').toNumber();
buf.writeUInt16LE(3, 1);
var script = Script().fromBuffer(buf);
script.chunks.length.should.equal(1);
script.chunks[0].buf.toString('hex').should.equal('010203');
script.toBuffer().toString('hex').should.equal(buf.toString('hex'));
});
it('should output this buffer containing OP_PUSHDATA4 and three bytes of data', function() {
var buf = new Buffer([0, 0, 0, 0, 0, 1, 2, 3]);
buf[0] = Opcode('OP_PUSHDATA4').toNumber();
buf.writeUInt16LE(3, 1);
var script = Script().fromBuffer(buf);
script.chunks.length.should.equal(1);
script.chunks[0].buf.toString('hex').should.equal('010203');
script.toBuffer().toString('hex').should.equal(buf.toString('hex'));
});
it('should output this buffer an OP code, data, and another OP code', function() {
var buf = new Buffer([0, 0, 0, 0, 0, 0, 1, 2, 3, 0]);
buf[0] = Opcode('OP_0').toNumber();
buf[1] = Opcode('OP_PUSHDATA4').toNumber();
buf.writeUInt16LE(3, 2);
buf[buf.length - 1] = Opcode('OP_0').toNumber();
var script = Script().fromBuffer(buf);
script.chunks.length.should.equal(3);
script.chunks[0].should.equal(buf[0]);
script.chunks[1].buf.toString('hex').should.equal('010203');
script.chunks[2].should.equal(buf[buf.length - 1]);
script.toBuffer().toString('hex').should.equal(buf.toString('hex'));
});
});
}); });