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script: use typeforce to enforce push-only chunks

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Daniel Cousens 2016-11-14 15:28:27 +11:00 • committed by Daniel Cousens
parent 0696ca95b6
commit 8df1b45699
1 changed files with 21 additions and 27 deletions
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48
src/script.js
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@ -14,6 +14,17 @@ var REVERSE_OPS = (function () {
})()
var OP_INT_BASE = OPS.OP_RESERVED // OP_1 - 1
function isOPInt (value) {
return types.Number(value) &&
(value === OPS.OP_0) ||
(value >= OPS.OP_1 && value <= OPS.OP_16) ||
(value === OPS.OP_1NEGATE)
}
function pushOnlyChunk (value) {
return types.oneOf(Buffer, isOPInt)
}
function compile (chunks) {
// TODO: remove me
if (Buffer.isBuffer(chunks)) return chunks
@ -131,37 +142,20 @@ function fromASM (asm) {
}
function decompilePushOnly (script) {
return decompile(script).map(function (op) {
if (op instanceof Buffer) {
return op
}
var chunks = decompile(script)
typeforce([pushOnlyChunk], chunks)
if (op === OPS.OP_0) {
return new Buffer(0)
} else if (op === OPS.OP_1NEGATE || op >= OPS.OP_1 && op <= OPS.OP_16) {
return scriptNumber.encode(op - OP_INT_BASE)
} else {
throw new Error('Can only evaluate push-only opcodes')
}
return chunks.map(function (op) {
if (Buffer.isBuffer(op)) return op
if (op === OPS.OP_0) return new Buffer(0)
return scriptNumber.encode(op - OP_INT_BASE)
})
}
function compilePushOnly (set) {
return compile(set.map(function (op) {
if (op.length === 0) {
return OPS.OP_0
}
if (op.length === 1) {
if (op[0] === 0x81) {
return OPS.OP_1NEGATE
} else if (op[0] >= 1 && op[0] <= OPS.OP_16) {
return op[0] + OP_INT_BASE
}
}
return op
}))
function compilePushOnly (chunks) {
typeforce([pushOnlyChunk], chunks)
return compile(chunks)
}
function isCanonicalPubKey (buffer) {