112 lines
2.7 KiB
JavaScript
112 lines
2.7 KiB
JavaScript
'use strict'
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var bigNumberify = require('./bignumber').bigNumberify
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var convert = require('./convert')
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var getAddress = require('./address').getAddress
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var utf8 = require('./utf8')
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var hashKeccak256 = require('./keccak256')
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var hashSha256 = require('./sha2').sha256
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var regexBytes = new RegExp('^bytes([0-9]+)$')
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var regexNumber = new RegExp('^(u?int)([0-9]*)$')
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var regexArray = new RegExp('^(.*)\\[([0-9]*)\\]$')
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var Zeros = '0000000000000000000000000000000000000000000000000000000000000000'
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function _pack (type, value, isArray) {
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switch (type) {
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case 'address':
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if (isArray) {
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return convert.padZeros(value, 32)
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}
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return convert.arrayify(value)
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case 'string':
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return utf8.toUtf8Bytes(value)
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case 'bytes':
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return convert.arrayify(value)
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case 'bool':
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value = value ? '0x01' : '0x00'
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if (isArray) {
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return convert.padZeros(value, 32)
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}
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return convert.arrayify(value)
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}
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var match = type.match(regexNumber)
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if (match) {
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var signed = match[1] === 'int'
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var size = parseInt(match[2] || '256')
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if (size % 8 != 0 || size === 0 || size > 256) {
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throw new Error('invalid number type - ' + type)
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}
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if (isArray) {
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size = 256
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}
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value = bigNumberify(value).toTwos(size)
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return convert.padZeros(value, size / 8)
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}
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match = type.match(regexBytes)
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if (match) {
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var size = match[1]
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if (size != parseInt(size) || size === 0 || size > 32) {
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throw new Error('invalid number type - ' + type)
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}
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size = parseInt(size)
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if (convert.arrayify(value).byteLength !== size) {
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throw new Error('invalid value for ' + type)
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}
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if (isArray) {
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return (value + Zeros).substring(0, 66)
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}
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return value
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}
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match = type.match(regexArray)
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if (match) {
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var valueType = match[1]
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var count = parseInt(match[2] || value.length)
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if (count != value.length) {
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throw new Error('invalid value for ' + type)
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}
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var result = []
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value.forEach(function (value) {
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value = _pack(valueType, value, true)
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result.push(value)
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})
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return convert.concat(result)
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}
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throw new Error('unknown type - ' + type)
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}
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function pack (types, values) {
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if (types.length != values.length) {
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throw new Error('type/value count mismatch')
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}
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var tight = []
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types.forEach(function (type, index) {
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tight.push(_pack(type, values[index]))
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})
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return convert.hexlify(convert.concat(tight))
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}
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function keccak256 (types, values) {
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return hashKeccak256(pack(types, values))
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}
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function sha256 (types, values) {
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return hashSha256(pack(types, values))
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}
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module.exports = {
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pack: pack,
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keccak256: keccak256,
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sha256: sha256
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}
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