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node_modules/@serialport/parser-cctalk/dist/index.js

@@ -0,0 +1,50 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.CCTalkParser = void 0;
+const stream_1 = require("stream");
+/**
+ * Parse the CCTalk protocol
+ * @extends Transform
+ *
+ * A transform stream that emits CCTalk packets as they are received.
+ */
+class CCTalkParser extends stream_1.Transform {
+    array;
+    cursor;
+    lastByteFetchTime;
+    maxDelayBetweenBytesMs;
+    constructor(maxDelayBetweenBytesMs = 50) {
+        super();
+        this.array = [];
+        this.cursor = 0;
+        this.lastByteFetchTime = 0;
+        this.maxDelayBetweenBytesMs = maxDelayBetweenBytesMs;
+    }
+    _transform(buffer, encoding, cb) {
+        if (this.maxDelayBetweenBytesMs > 0) {
+            const now = Date.now();
+            if (now - this.lastByteFetchTime > this.maxDelayBetweenBytesMs) {
+                this.array = [];
+                this.cursor = 0;
+            }
+            this.lastByteFetchTime = now;
+        }
+        this.cursor += buffer.length;
+        // TODO: Better Faster es7 no supported by node 4
+        // ES7 allows directly push [...buffer]
+        // this.array = this.array.concat(Array.from(buffer)) //Slower ?!?
+        Array.from(buffer).map(byte => this.array.push(byte));
+        while (this.cursor > 1 && this.cursor >= this.array[1] + 5) {
+            // full frame accumulated
+            // copy command from the array
+            const FullMsgLength = this.array[1] + 5;
+            const frame = Buffer.from(this.array.slice(0, FullMsgLength));
+            // Preserve Extra Data
+            this.array = this.array.slice(frame.length, this.array.length);
+            this.cursor -= FullMsgLength;
+            this.push(frame);
+        }
+        cb();
+    }
+}
+exports.CCTalkParser = CCTalkParser;