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| Viewing file: Select action/file-type: "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(fileHandle, filePath, fileSize) {
this.fileHandle = fileHandle;
this.filePath = filePath;
this.fileSize = fileSize;
}
/**
* 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
*/
async randomRead(buffer, offset, length, position) {
const result = await this.fileHandle.read(buffer, offset, length, position);
return result.bytesRead;
}
async close() {
return this.fileHandle.close();
}
static async init(filePath, fileSize) {
const fileHandle = await fs.promises.open(filePath, 'r');
return new RandomFileReader(fileHandle, filePath, fileSize);
}
}
exports.RandomFileReader = RandomFileReader;
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