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Script: remove redundant opcode.map access

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This commit is contained in:
Daniel Cousens 2014-05-10 11:35:21 +10:00
parent 9cd34f50d5
commit 1fe8282eda
1 changed files with 34 additions and 34 deletions
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68
src/script.js
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@ -1,6 +1,6 @@
var assert = require('assert') var assert = require('assert')
var crypto = require('./crypto') var crypto = require('./crypto')
var Opcode = require('./opcode') var opcodes = require('./opcode').map
function Script(data) { function Script(data) {
data = data || [] data = data || []
@ -63,16 +63,16 @@ Script.prototype.parse = function() {
} }
var len var len
if (opcode > 0 && opcode < Opcode.map.OP_PUSHDATA1) { if (opcode > 0 && opcode < opcodes.OP_PUSHDATA1) {
// Read some bytes of data, opcode value is the length of data // Read some bytes of data, opcode value is the length of data
readChunk(opcode) readChunk(opcode)
} else if (opcode == Opcode.map.OP_PUSHDATA1) { } else if (opcode == opcodes.OP_PUSHDATA1) {
len = this.buffer[i++] len = this.buffer[i++]
readChunk(len) readChunk(len)
} else if (opcode == Opcode.map.OP_PUSHDATA2) { } else if (opcode == opcodes.OP_PUSHDATA2) {
len = (this.buffer[i++] << 8) | this.buffer[i++] len = (this.buffer[i++] << 8) | this.buffer[i++]
readChunk(len) readChunk(len)
} else if (opcode == Opcode.map.OP_PUSHDATA4) { } else if (opcode == opcodes.OP_PUSHDATA4) {
len = (this.buffer[i++] << 24) | len = (this.buffer[i++] << 24) |
(this.buffer[i++] << 16) | (this.buffer[i++] << 16) |
(this.buffer[i++] << 8) | (this.buffer[i++] << 8) |
@ -136,23 +136,23 @@ Script.prototype.getOutType = function() {
function isPubkeyhash() { function isPubkeyhash() {
return this.chunks.length == 5 && return this.chunks.length == 5 &&
this.chunks[0] == Opcode.map.OP_DUP && this.chunks[0] == opcodes.OP_DUP &&
this.chunks[1] == Opcode.map.OP_HASH160 && this.chunks[1] == opcodes.OP_HASH160 &&
Array.isArray(this.chunks[2]) && Array.isArray(this.chunks[2]) &&
this.chunks[2].length === 20 && this.chunks[2].length === 20 &&
this.chunks[3] == Opcode.map.OP_EQUALVERIFY && this.chunks[3] == opcodes.OP_EQUALVERIFY &&
this.chunks[4] == Opcode.map.OP_CHECKSIG this.chunks[4] == opcodes.OP_CHECKSIG
} }
function isPubkey() { function isPubkey() {
return this.chunks.length === 2 && return this.chunks.length === 2 &&
Array.isArray(this.chunks[0]) && Array.isArray(this.chunks[0]) &&
this.chunks[1] === Opcode.map.OP_CHECKSIG this.chunks[1] === opcodes.OP_CHECKSIG
} }
function isScripthash() { function isScripthash() {
return this.chunks[this.chunks.length - 1] == Opcode.map.OP_EQUAL && return this.chunks[this.chunks.length - 1] == opcodes.OP_EQUAL &&
this.chunks[0] == Opcode.map.OP_HASH160 && this.chunks[0] == opcodes.OP_HASH160 &&
Array.isArray(this.chunks[1]) && Array.isArray(this.chunks[1]) &&
this.chunks[1].length === 20 && this.chunks[1].length === 20 &&
this.chunks.length == 3 this.chunks.length == 3
@ -167,20 +167,20 @@ function isMultisig() {
// n greater or equal to m // n greater or equal to m
this.chunks[0] <= this.chunks[this.chunks.length - 2] && this.chunks[0] <= this.chunks[this.chunks.length - 2] &&
// n cannot be 0 // n cannot be 0
this.chunks[this.chunks.length - 2] !== Opcode.map.OP_0 && this.chunks[this.chunks.length - 2] !== opcodes.OP_0 &&
// n is the size of chunk length minus 3 (m, n, OP_CHECKMULTISIG) // n is the size of chunk length minus 3 (m, n, OP_CHECKMULTISIG)
this.chunks.length - 3 === this.chunks[this.chunks.length - 2] - Opcode.map.OP_RESERVED && this.chunks.length - 3 === this.chunks[this.chunks.length - 2] - opcodes.OP_RESERVED &&
// last chunk is OP_CHECKMULTISIG // last chunk is OP_CHECKMULTISIG
this.chunks[this.chunks.length - 1] == Opcode.map.OP_CHECKMULTISIG this.chunks[this.chunks.length - 1] == opcodes.OP_CHECKMULTISIG
} }
function isNulldata() { function isNulldata() {
return this.chunks[0] === Opcode.map.OP_RETURN return this.chunks[0] === opcodes.OP_RETURN
} }
function isSmallIntOp(opcode) { function isSmallIntOp(opcode) {
return ((opcode == Opcode.map.OP_0) || return ((opcode == opcodes.OP_0) ||
((opcode >= Opcode.map.OP_1) && (opcode <= Opcode.map.OP_16))) ((opcode >= opcodes.OP_1) && (opcode <= opcodes.OP_16)))
} }
Script.prototype.getHash = function() { Script.prototype.getHash = function() {
@ -222,7 +222,7 @@ Script.prototype.getInType = function() {
Array.isArray(this.chunks[0]) && Array.isArray(this.chunks[0]) &&
Array.isArray(this.chunks[1])) { Array.isArray(this.chunks[1])) {
return 'pubkeyhash' return 'pubkeyhash'
} else if (this.chunks[0] == Opcode.map.OP_0 && } else if (this.chunks[0] == opcodes.OP_0 &&
this.chunks.slice(1).reduce(function(t, chunk, i) { this.chunks.slice(1).reduce(function(t, chunk, i) {
return t && Array.isArray(chunk) && (chunk[0] == 48 || i == this.chunks.length - 1) return t && Array.isArray(chunk) && (chunk[0] == 48 || i == this.chunks.length - 1)
}, true)) { }, true)) {
@ -248,17 +248,17 @@ Script.prototype.writeBytes = function(data) {
if (Buffer.isBuffer(data)) data = Array.prototype.slice.call(data); if (Buffer.isBuffer(data)) data = Array.prototype.slice.call(data);
assert(Array.isArray(data), "Expected a byte array. Got " + data) assert(Array.isArray(data), "Expected a byte array. Got " + data)
if (data.length < Opcode.map.OP_PUSHDATA1) { if (data.length < opcodes.OP_PUSHDATA1) {
this.buffer.push(data.length) this.buffer.push(data.length)
} else if (data.length <= 0xff) { } else if (data.length <= 0xff) {
this.buffer.push(Opcode.map.OP_PUSHDATA1) this.buffer.push(opcodes.OP_PUSHDATA1)
this.buffer.push(data.length) this.buffer.push(data.length)
} else if (data.length <= 0xffff) { } else if (data.length <= 0xffff) {
this.buffer.push(Opcode.map.OP_PUSHDATA2) this.buffer.push(opcodes.OP_PUSHDATA2)
this.buffer.push(data.length & 0xff) this.buffer.push(data.length & 0xff)
this.buffer.push((data.length >>> 8) & 0xff) this.buffer.push((data.length >>> 8) & 0xff)
} else { } else {
this.buffer.push(Opcode.map.OP_PUSHDATA4) this.buffer.push(opcodes.OP_PUSHDATA4)
this.buffer.push(data.length & 0xff) this.buffer.push(data.length & 0xff)
this.buffer.push((data.length >>> 8) & 0xff) this.buffer.push((data.length >>> 8) & 0xff)
this.buffer.push((data.length >>> 16) & 0xff) this.buffer.push((data.length >>> 16) & 0xff)
@ -272,11 +272,11 @@ Script.prototype.writeBytes = function(data) {
Script.createPubKeyHashScriptPubKey = function(hash) { Script.createPubKeyHashScriptPubKey = function(hash) {
var script = new Script() var script = new Script()
script.writeOp(Opcode.map.OP_DUP) script.writeOp(opcodes.OP_DUP)
script.writeOp(Opcode.map.OP_HASH160) script.writeOp(opcodes.OP_HASH160)
script.writeBytes(hash) script.writeBytes(hash)
script.writeOp(Opcode.map.OP_EQUALVERIFY) script.writeOp(opcodes.OP_EQUALVERIFY)
script.writeOp(Opcode.map.OP_CHECKSIG) script.writeOp(opcodes.OP_CHECKSIG)
return script return script
} }
@ -285,9 +285,9 @@ Script.createPubKeyHashScriptPubKey = function(hash) {
Script.createP2SHScriptPubKey = function(hash) { Script.createP2SHScriptPubKey = function(hash) {
var script = new Script() var script = new Script()
script.writeOp(Opcode.map.OP_HASH160) script.writeOp(opcodes.OP_HASH160)
script.writeBytes(hash) script.writeBytes(hash)
script.writeOp(Opcode.map.OP_EQUAL) script.writeOp(opcodes.OP_EQUAL)
return script return script
} }
@ -296,12 +296,12 @@ Script.createP2SHScriptPubKey = function(hash) {
Script.createMultisigScriptPubKey = function(m, pubKeys) { Script.createMultisigScriptPubKey = function(m, pubKeys) {
var script = new Script() var script = new Script()
script.writeOp(Opcode.map.OP_1 + m - 1) script.writeOp(opcodes.OP_1 + m - 1)
for (var i = 0; i < pubKeys.length; ++i) { for (var i = 0; i < pubKeys.length; ++i) {
script.writeBytes(pubKeys[i]) script.writeBytes(pubKeys[i])
} }
script.writeOp(Opcode.map.OP_1 + pubKeys.length - 1) script.writeOp(opcodes.OP_1 + pubKeys.length - 1)
script.writeOp(Opcode.map.OP_CHECKMULTISIG) script.writeOp(opcodes.OP_CHECKMULTISIG)
return script return script
} }
@ -320,13 +320,13 @@ Script.createMultisigScriptSig = function(signatures, scriptPubKey) {
assert(isMultisig.call(scriptPubKey)) assert(isMultisig.call(scriptPubKey))
var m = scriptPubKey.chunks[0] var m = scriptPubKey.chunks[0]
var k = m - (Opcode.map.OP_1 - 1) var k = m - (opcodes.OP_1 - 1)
assert(k <= signatures.length, 'Not enough signatures provided') assert(k <= signatures.length, 'Not enough signatures provided')
} }
var inScript = new Script() var inScript = new Script()
inScript.writeOp(Opcode.map.OP_0) inScript.writeOp(opcodes.OP_0)
signatures.map(function(sig) { signatures.map(function(sig) {
inScript.writeBytes(sig) inScript.writeBytes(sig)
}) })