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var Writable = require('readable-stream').Writable
var inherits = require('inherits')
var bufferFrom = require('buffer-from')
if (typeof Uint8Array === 'undefined') {
var U8 = require('typedarray').Uint8Array
} else {
var U8 = Uint8Array
}
function ConcatStream(opts, cb) {
if (!(this instanceof ConcatStream)) return new ConcatStream(opts, cb)
if (typeof opts === 'function') {
cb = opts
opts = {}
}
if (!opts) opts = {}
var encoding = opts.encoding
var shouldInferEncoding = false
if (!encoding) {
shouldInferEncoding = true
} else {
encoding = String(encoding).toLowerCase()
if (encoding === 'u8' || encoding === 'uint8') {
encoding = 'uint8array'
}
}
Writable.call(this, { objectMode: true })
this.encoding = encoding
this.shouldInferEncoding = shouldInferEncoding
if (cb) this.on('finish', function () { cb(this.getBody()) })
this.body = []
}
module.exports = ConcatStream
inherits(ConcatStream, Writable)
ConcatStream.prototype._write = function(chunk, enc, next) {
this.body.push(chunk)
next()
}
ConcatStream.prototype.inferEncoding = function (buff) {
var firstBuffer = buff === undefined ? this.body[0] : buff;
if (Buffer.isBuffer(firstBuffer)) return 'buffer'
if (typeof Uint8Array !== 'undefined' && firstBuffer instanceof Uint8Array) return 'uint8array'
if (Array.isArray(firstBuffer)) return 'array'
if (typeof firstBuffer === 'string') return 'string'
if (Object.prototype.toString.call(firstBuffer) === "[object Object]") return 'object'
return 'buffer'
}
ConcatStream.prototype.getBody = function () {
if (!this.encoding && this.body.length === 0) return []
if (this.shouldInferEncoding) this.encoding = this.inferEncoding()
if (this.encoding === 'array') return arrayConcat(this.body)
if (this.encoding === 'string') return stringConcat(this.body)
if (this.encoding === 'buffer') return bufferConcat(this.body)
if (this.encoding === 'uint8array') return u8Concat(this.body)
return this.body
}
var isArray = Array.isArray || function (arr) {
return Object.prototype.toString.call(arr) == '[object Array]'
}
function isArrayish (arr) {
return /Array\]$/.test(Object.prototype.toString.call(arr))
}
function isBufferish (p) {
return typeof p === 'string' || isArrayish(p) || (p && typeof p.subarray === 'function')
}
function stringConcat (parts) {
var strings = []
var needsToString = false
for (var i = 0; i < parts.length; i++) {
var p = parts[i]
if (typeof p === 'string') {
strings.push(p)
} else if (Buffer.isBuffer(p)) {
strings.push(p)
} else if (isBufferish(p)) {
strings.push(bufferFrom(p))
} else {
strings.push(bufferFrom(String(p)))
}
}
if (Buffer.isBuffer(parts[0])) {
strings = Buffer.concat(strings)
strings = strings.toString('utf8')
} else {
strings = strings.join('')
}
return strings
}
function bufferConcat (parts) {
var bufs = []
for (var i = 0; i < parts.length; i++) {
var p = parts[i]
if (Buffer.isBuffer(p)) {
bufs.push(p)
} else if (isBufferish(p)) {
bufs.push(bufferFrom(p))
} else {
bufs.push(bufferFrom(String(p)))
}
}
return Buffer.concat(bufs)
}
function arrayConcat (parts) {
var res = []
for (var i = 0; i < parts.length; i++) {
res.push.apply(res, parts[i])
}
return res
}
function u8Concat (parts) {
var len = 0
for (var i = 0; i < parts.length; i++) {
if (typeof parts[i] === 'string') {
parts[i] = bufferFrom(parts[i])
}
len += parts[i].length
}
var u8 = new U8(len)
for (var i = 0, offset = 0; i < parts.length; i++) {
var part = parts[i]
for (var j = 0; j < part.length; j++) {
u8[offset++] = part[j]
}
}
return u8
}
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