Initial working version

node_modules/music-metadata/lib/common/RandomFileReader.js

@@ -0,0 +1,37 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.RandomFileReader = void 0;
+const fs = require("fs");
+/**
+ * Provides abstract file access via the IRandomRead interface
+ */
+class RandomFileReader {
+    constructor(filePath, fileSize) {
+        this.fileSize = fileSize;
+        this.fd = fs.openSync(filePath, 'r');
+    }
+    /**
+     * Read from a given position of an abstracted file or buffer.
+     * @param buffer {Buffer} is the buffer that the data will be written to.
+     * @param offset {number} is the offset in the buffer to start writing at.
+     * @param length {number}is an integer specifying the number of bytes to read.
+     * @param position {number} is an argument specifying where to begin reading from in the file.
+     * @return {Promise<number>} bytes read
+     */
+    randomRead(buffer, offset, length, position) {
+        return new Promise((resolve, reject) => {
+            fs.read(this.fd, buffer, offset, length, position, (err, bytesRead) => {
+                if (err) {
+                    reject(err);
+                }
+                else {
+                    resolve(bytesRead);
+                }
+            });
+        });
+    }
+    close() {
+        fs.closeSync(this.fd);
+    }
+}
+exports.RandomFileReader = RandomFileReader;