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Script().fromBuffer(buf) 

...code heavily inspired/copied from bitcore
This commit is contained in:
Ryan X. Charles 2014-09-01 16:41:07 -07:00
parent 8b3ad7ac85
commit 697b3e5009
2 changed files with 92 additions and 1 deletions
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37
lib/script.js
View File

@ -8,7 +8,11 @@ var Script = function Script(buf) {
this.chunks = [];
if (Buffer.isBuffer(buf)) {
this.parse(buf);
this.fromBuffer(buf);
}
else if (typeof buf === 'string') {
var str = buf;
this.fromString(str);
}
else if (typeof buf !== 'undefined') {
var obj = buf;
@ -21,4 +25,35 @@ Script.prototype.set = function(obj) {
return this;
};
Script.prototype.fromBuffer = function(buf) {
this.chunks = [];
var br = new BufferReader(buf);
while (!br.eof()) {
var opcode = br.readUInt8();
var len, chunk;
if (opcode > 0 && opcode < Opcode.map.OP_PUSHDATA1) {
// Read some bytes of data, opcode value is the length of data
this.chunks.push(br.buffer(opcode));
} else if (opcode === Opcode.map.OP_PUSHDATA1) {
len = br.readUInt8();
chunk = br.buffer(len);
this.chunks.push(chunk);
} else if (opcode === Opcode.map.OP_PUSHDATA2) {
len = br.readUInt16LE();
chunk = br.buffer(len);
this.chunks.push(chunk);
} else if (opcode === Opcode.map.OP_PUSHDATA4) {
len = br.readUInt32LE();
chunk = br.buffer(len);
this.chunks.push(chunk);
} else {
this.chunks.push(opcode);
}
}
return this;
};
module.exports = Script;

56
test/script.js
View File

@ -1,6 +1,8 @@
var Script = require('../lib/script');
var should = require('chai').should();
var Opcode = require('../lib/opcode');
var BufferReader = require('../lib/bufferreader');
var BufferWriter = require('../lib/bufferwriter');
describe('Script', function() {
@ -8,4 +10,58 @@ describe('Script', function() {
var script = new Script();
});
describe('#fromBuffer', function() {
it('should parse 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]);
});
it('should parse 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]);
});
it('should parse 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].toString('hex').should.equal('010203');
});
it('should parse 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].toString('hex').should.equal('010203');
});
it('should parse 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].toString('hex').should.equal('010203');
});
it('should parse 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].toString('hex').should.equal('010203');
});
});
});