378dc923ef
When parsing OP_PUSHDATAX commands, the the length of data might not require the size integer of OP_PUSHDATAX. For instance, you might write 1 byte, and yet use OP_PUSHDATA4. We need to record which OP_PUSHDATAX was used so that when we write the buffer back out, we can write the same one. Also, the claimed length may be different. For instance, we may OP_PUSHDATA of length 100 to the stack, but there may only be 50 bytes left in the script. In that case, buf.length and chunk.len will be different. I'm not sure if that would be considered a valid script, but in any case, for script analysis, we need both values.
81 lines
3.0 KiB
JavaScript
81 lines
3.0 KiB
JavaScript
var Script = require('../lib/script');
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var should = require('chai').should();
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var Opcode = require('../lib/opcode');
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var BufferReader = require('../lib/bufferreader');
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var BufferWriter = require('../lib/bufferwriter');
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describe('Script', function() {
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it('should make a new script', function() {
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var script = new Script();
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});
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describe('#fromBuffer', function() {
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it('should parse this buffer containing an OP code', function() {
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var buf = new Buffer(1);
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buf[0] = Opcode('OP_0').toNumber();
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var script = Script().fromBuffer(buf);
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script.chunks.length.should.equal(1);
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script.chunks[0].should.equal(buf[0]);
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});
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it('should parse this buffer containing another OP code', function() {
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var buf = new Buffer(1);
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buf[0] = Opcode('OP_CHECKMULTISIG').toNumber();
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var script = Script().fromBuffer(buf);
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script.chunks.length.should.equal(1);
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script.chunks[0].should.equal(buf[0]);
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});
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it('should parse this buffer containing three bytes of data', function() {
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var buf = new Buffer([3, 1, 2, 3]);
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var script = Script().fromBuffer(buf);
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script.chunks.length.should.equal(1);
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script.chunks[0].buf.toString('hex').should.equal('010203');
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});
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it('should parse this buffer containing OP_PUSHDATA1 and three bytes of data', function() {
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var buf = new Buffer([0, 0, 1, 2, 3]);
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buf[0] = Opcode('OP_PUSHDATA1').toNumber();
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buf.writeUInt8(3, 1);
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var script = Script().fromBuffer(buf);
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script.chunks.length.should.equal(1);
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script.chunks[0].buf.toString('hex').should.equal('010203');
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});
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it('should parse this buffer containing OP_PUSHDATA2 and three bytes of data', function() {
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var buf = new Buffer([0, 0, 0, 1, 2, 3]);
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buf[0] = Opcode('OP_PUSHDATA2').toNumber();
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buf.writeUInt16LE(3, 1);
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var script = Script().fromBuffer(buf);
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script.chunks.length.should.equal(1);
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script.chunks[0].buf.toString('hex').should.equal('010203');
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});
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it('should parse this buffer containing OP_PUSHDATA4 and three bytes of data', function() {
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var buf = new Buffer([0, 0, 0, 0, 0, 1, 2, 3]);
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buf[0] = Opcode('OP_PUSHDATA4').toNumber();
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buf.writeUInt16LE(3, 1);
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var script = Script().fromBuffer(buf);
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script.chunks.length.should.equal(1);
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script.chunks[0].buf.toString('hex').should.equal('010203');
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});
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it('should parse this buffer an OP code, data, and another OP code', function() {
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var buf = new Buffer([0, 0, 0, 0, 0, 0, 1, 2, 3, 0]);
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buf[0] = Opcode('OP_0').toNumber();
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buf[1] = Opcode('OP_PUSHDATA4').toNumber();
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buf.writeUInt16LE(3, 2);
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buf[buf.length - 1] = Opcode('OP_0').toNumber();
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var script = Script().fromBuffer(buf);
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script.chunks.length.should.equal(3);
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script.chunks[0].should.equal(buf[0]);
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script.chunks[1].buf.toString('hex').should.equal('010203');
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script.chunks[2].should.equal(buf[buf.length - 1]);
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});
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});
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});
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