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node_modules/@serialport/parser-packet-length/LICENSE

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+The MIT License (MIT)
+
+Copyright 2010 Christopher Williams. All rights reserved.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to
+deal in the Software without restriction, including without limitation the
+rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+sell copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+IN THE SOFTWARE.

node_modules/@serialport/parser-packet-length/README.md

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+# @serialport/parser-packet-length
+
+The documentation at https://serialport.io/docs/api-parser-packet-length

node_modules/@serialport/parser-packet-length/dist/index.d.ts

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+/// <reference types="node" />
+/// <reference types="node" />
+import { Transform, TransformCallback, TransformOptions } from 'stream';
+export interface PacketLengthOptions extends TransformOptions {
+    /** delimiter to use defaults to 0xaa */
+    delimiter?: number;
+    /** overhead of packet (including length, delimiter and any checksum / packet footer) defaults to 2 */
+    packetOverhead?: number;
+    /** number of bytes containing length defaults to 1 */
+    lengthBytes?: number;
+    /** offset of length field defaults to 1 */
+    lengthOffset?: number;
+    /**  max packet length defaults to 0xff */
+    maxLen?: number;
+}
+/**
+ * A transform stream that decodes packets with a delimiter and length of payload
+ * specified within the data stream.
+ * @extends Transform
+ * @summary Decodes packets of the general form:
+ *       [delimiter][len][payload0] ... [payload0 + len]
+ *
+ * The length field can be up to 4 bytes and can be at any offset within the packet
+ *       [delimiter][header0][header1][len0][len1[payload0] ... [payload0 + len]
+ *
+ * The offset and number of bytes of the length field need to be provided in options
+ * if not 1 byte immediately following the delimiter.
+ */
+export declare class PacketLengthParser extends Transform {
+    buffer: Buffer;
+    start: boolean;
+    opts: {
+        delimiter: number;
+        packetOverhead: number;
+        lengthBytes: number;
+        lengthOffset: number;
+        maxLen: number;
+    };
+    constructor(options?: PacketLengthOptions);
+    _transform(chunk: Buffer, encoding: BufferEncoding, cb: TransformCallback): void;
+    _flush(cb: TransformCallback): void;
+}

node_modules/@serialport/parser-packet-length/dist/index.js

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+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.PacketLengthParser = void 0;
+const stream_1 = require("stream");
+/**
+ * A transform stream that decodes packets with a delimiter and length of payload
+ * specified within the data stream.
+ * @extends Transform
+ * @summary Decodes packets of the general form:
+ *       [delimiter][len][payload0] ... [payload0 + len]
+ *
+ * The length field can be up to 4 bytes and can be at any offset within the packet
+ *       [delimiter][header0][header1][len0][len1[payload0] ... [payload0 + len]
+ *
+ * The offset and number of bytes of the length field need to be provided in options
+ * if not 1 byte immediately following the delimiter.
+ */
+class PacketLengthParser extends stream_1.Transform {
+    buffer;
+    start;
+    opts;
+    constructor(options = {}) {
+        super(options);
+        const { delimiter = 0xaa, packetOverhead = 2, lengthBytes = 1, lengthOffset = 1, maxLen = 0xff } = options;
+        this.opts = {
+            delimiter,
+            packetOverhead,
+            lengthBytes,
+            lengthOffset,
+            maxLen,
+        };
+        this.buffer = Buffer.alloc(0);
+        this.start = false;
+    }
+    _transform(chunk, encoding, cb) {
+        for (let ndx = 0; ndx < chunk.length; ndx++) {
+            const byte = chunk[ndx];
+            if (byte === this.opts.delimiter) {
+                this.start = true;
+            }
+            if (true === this.start) {
+                this.buffer = Buffer.concat([this.buffer, Buffer.from([byte])]);
+                if (this.buffer.length >= this.opts.lengthOffset + this.opts.lengthBytes) {
+                    const len = this.buffer.readUIntLE(this.opts.lengthOffset, this.opts.lengthBytes);
+                    if (this.buffer.length == len + this.opts.packetOverhead || len > this.opts.maxLen) {
+                        this.push(this.buffer);
+                        this.buffer = Buffer.alloc(0);
+                        this.start = false;
+                    }
+                }
+            }
+        }
+        cb();
+    }
+    _flush(cb) {
+        this.push(this.buffer);
+        this.buffer = Buffer.alloc(0);
+        cb();
+    }
+}
+exports.PacketLengthParser = PacketLengthParser;

node_modules/@serialport/parser-packet-length/package.json

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+{
+  "name": "@serialport/parser-packet-length",
+  "main": "./dist/index.js",
+  "types": "./dist/index.d.ts",
+  "scripts": {
+    "build": "tsc --build tsconfig-build.json"
+  },
+  "version": "12.0.0",
+  "engines": {
+    "node": ">=8.6.0"
+  },
+  "publishConfig": {
+    "access": "public"
+  },
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/serialport/node-serialport.git"
+  },
+  "devDependencies": {
+    "typescript": "5.2.2"
+  },
+  "gitHead": "f7e7bd53f9578a26c4f44cc1949fef396dc064c7"
+}