AlkantarClanX12
Your IP : 3.147.51.75
'use strict'
var Transform = require('stream').Transform
var crypto = require('crypto')
var fs = require('graceful-fs')
exports.check = check
exports.checkSync = checkSync
exports.get = get
exports.getSync = getSync
exports.stream = stream
function check(file, expected, options, cb) {
if (typeof options === 'function') {
cb = options
options = undefined
}
expected = expected.toLowerCase().trim()
get(file, options, function (er, actual) {
if (er) {
if (er.message) er.message += ' while getting shasum for ' + file
return cb(er)
}
if (actual === expected) return cb(null)
cb(new Error(
'shasum check failed for ' + file + '\n'
+ 'Expected: ' + expected + '\n'
+ 'Actual: ' + actual))
})
}
function checkSync(file, expected, options) {
expected = expected.toLowerCase().trim()
var actual
try {
actual = getSync(file, options)
} catch (er) {
if (er.message) er.message += ' while getting shasum for ' + file
throw er
}
if (actual !== expected) {
var ex = new Error(
'shasum check failed for ' + file + '\n'
+ 'Expected: ' + expected + '\n'
+ 'Actual: ' + actual)
throw ex
}
}
function get(file, options, cb) {
if (typeof options === 'function') {
cb = options
options = undefined
}
options = options || {}
var algorithm = options.algorithm || 'sha1'
var hash = crypto.createHash(algorithm)
var source = fs.createReadStream(file)
var errState = null
source
.on('error', function (er) {
if (errState) return
return cb(errState = er)
})
.on('data', function (chunk) {
if (errState) return
hash.update(chunk)
})
.on('end', function () {
if (errState) return
var actual = hash.digest("hex").toLowerCase().trim()
cb(null, actual)
})
}
function getSync(file, options) {
options = options || {}
var algorithm = options.algorithm || 'sha1'
var hash = crypto.createHash(algorithm)
var source = fs.readFileSync(file)
hash.update(source)
return hash.digest("hex").toLowerCase().trim()
}
function stream(expected, options) {
expected = expected.toLowerCase().trim()
options = options || {}
var algorithm = options.algorithm || 'sha1'
var hash = crypto.createHash(algorithm)
var stream = new Transform()
stream._transform = function (chunk, encoding, callback) {
hash.update(chunk)
stream.push(chunk)
callback()
}
stream._flush = function (cb) {
var actual = hash.digest("hex").toLowerCase().trim()
if (actual === expected) return cb(null)
cb(new Error(
'shasum check failed for:\n'
+ ' Expected: ' + expected + '\n'
+ ' Actual: ' + actual))
this.push(null)
}
return stream
}