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backend/node_modules/msgpackr/stream.js

@@ -0,0 +1,57 @@
+import { Transform } from 'stream'
+import { Packr } from './pack.js'
+import { Unpackr } from './unpack.js'
+var DEFAULT_OPTIONS = {objectMode: true}
+
+export class PackrStream extends Transform {
+	constructor(options) {
+		if (!options)
+			options = {}
+		options.writableObjectMode = true
+		super(options)
+		options.sequential = true
+		this.packr = options.packr || new Packr(options)
+	}
+	_transform(value, encoding, callback) {
+		this.push(this.packr.pack(value))
+		callback()
+	}
+}
+
+export class UnpackrStream extends Transform {
+	constructor(options) {
+		if (!options)
+			options = {}
+		options.objectMode = true
+		super(options)
+		options.structures = []
+		this.unpackr = options.unpackr || new Unpackr(options)
+	}
+	_transform(chunk, encoding, callback) {
+		if (this.incompleteBuffer) {
+			chunk = Buffer.concat([this.incompleteBuffer, chunk])
+			this.incompleteBuffer = null
+		}
+		let values
+		try {
+			values = this.unpackr.unpackMultiple(chunk)
+		} catch(error) {
+			if (error.incomplete) {
+				this.incompleteBuffer = chunk.slice(error.lastPosition)
+				values = error.values
+			}
+			else
+				throw error
+		} finally {
+			for (let value of values || []) {
+				if (value === null)
+					value = this.getNullValue()
+				this.push(value)
+			}
+		}
+		if (callback) callback()
+	}
+	getNullValue() {
+		return Symbol.for(null)
+	}
+}