is-file-equal-buffer/dist/index.js

Compare file contents with buffer

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.isFileEqualBuffer = void 0;
function getFileSize(filePath, fs) {
    return new Promise(function executor(resolve, reject) {
        fs.stat(filePath, function stat(err, stats) {
            if (err !== null) {
                if (err.code === 'ENOENT') {
                    return resolve(-1);
                }
                return reject(err);
            }
            resolve(stats.size);
        });
    });
}
function isFileEqualBuffer(filePath, buffer, { fs = require('fs') } = {}) {
    return getFileSize(filePath, fs).then(function fileSize(size) {
        if (buffer.length !== size) {
            return false;
        }
        return new Promise(function executor(resolve, reject) {
            const stream = fs.createReadStream(filePath);
            let offset = 0;
            let isEqual = true;
            stream.on('data', function read(data) {
                if (!Buffer.isBuffer(data)) {
                    data = Buffer.from(data);
                }
                if (buffer.length >= offset + data.length &&
                    buffer.compare(data, 0, data.length, offset, offset + data.length) ===
                        0) {
                    offset += data.length;
                }
                else {
                    isEqual = false;
                    stream.close();
                }
            });
            stream.on('error', function error(err) {
                if (err.code === 'ENOENT') {
                    isEqual = false;
                    resolve(isEqual);
                }
                else {
                    reject(err);
                }
            });
            stream.on('close', function close() {
                resolve(offset === 0 && buffer.length > 0 ? false : isEqual);
            });
        });
    });
}
exports.isFileEqualBuffer = isFileEqualBuffer;
exports.default = isFileEqualBuffer;