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