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235
my-app/node_modules/isbinaryfile/lib/index.js
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my-app/node_modules/isbinaryfile/lib/index.js
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"use strict";
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var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
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function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
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return new (P || (P = Promise))(function (resolve, reject) {
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function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
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function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
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function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
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step((generator = generator.apply(thisArg, _arguments || [])).next());
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});
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};
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.isBinaryFileSync = exports.isBinaryFile = void 0;
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const fs = require("fs");
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const util_1 = require("util");
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const statAsync = util_1.promisify(fs.stat);
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const openAsync = util_1.promisify(fs.open);
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const closeAsync = util_1.promisify(fs.close);
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const MAX_BYTES = 512;
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// A very basic non-exception raising reader. Read bytes and
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// at the end use hasError() to check whether this worked.
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class Reader {
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constructor(fileBuffer, size) {
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this.fileBuffer = fileBuffer;
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this.size = size;
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this.offset = 0;
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this.error = false;
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}
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hasError() {
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return this.error;
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}
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nextByte() {
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if (this.offset === this.size || this.hasError()) {
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this.error = true;
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return 0xff;
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}
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return this.fileBuffer[this.offset++];
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}
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next(len) {
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const n = new Array();
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for (let i = 0; i < len; i++) {
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n[i] = this.nextByte();
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}
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return n;
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}
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}
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// Read a Google Protobuf var(iable)int from the buffer.
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function readProtoVarInt(reader) {
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let idx = 0;
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let varInt = 0;
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while (!reader.hasError()) {
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const b = reader.nextByte();
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varInt = varInt | ((b & 0x7f) << (7 * idx));
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if ((b & 0x80) === 0) {
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break;
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}
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idx++;
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}
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return varInt;
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}
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// Attempt to taste a full Google Protobuf message.
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function readProtoMessage(reader) {
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const varInt = readProtoVarInt(reader);
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const wireType = varInt & 0x7;
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switch (wireType) {
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case 0:
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readProtoVarInt(reader);
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return true;
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case 1:
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reader.next(8);
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return true;
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case 2:
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const len = readProtoVarInt(reader);
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reader.next(len);
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return true;
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case 5:
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reader.next(4);
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return true;
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}
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return false;
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}
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// Check whether this seems to be a valid protobuf file.
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function isBinaryProto(fileBuffer, totalBytes) {
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const reader = new Reader(fileBuffer, totalBytes);
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let numMessages = 0;
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while (true) {
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// Definitely not a valid protobuf
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if (!readProtoMessage(reader) && !reader.hasError()) {
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return false;
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}
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// Short read?
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if (reader.hasError()) {
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break;
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}
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numMessages++;
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}
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return numMessages > 0;
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}
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function isBinaryFile(file, size) {
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return __awaiter(this, void 0, void 0, function* () {
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if (isString(file)) {
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const stat = yield statAsync(file);
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isStatFile(stat);
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const fileDescriptor = yield openAsync(file, 'r');
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const allocBuffer = Buffer.alloc(MAX_BYTES);
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// Read the file with no encoding for raw buffer access.
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// NB: something is severely wrong with promisify, had to construct my own Promise
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return new Promise((fulfill, reject) => {
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fs.read(fileDescriptor, allocBuffer, 0, MAX_BYTES, 0, (err, bytesRead, _) => {
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closeAsync(fileDescriptor);
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if (err) {
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reject(err);
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}
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else {
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fulfill(isBinaryCheck(allocBuffer, bytesRead));
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}
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});
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});
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}
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else {
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if (size === undefined) {
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size = file.length;
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}
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return isBinaryCheck(file, size);
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}
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});
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}
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exports.isBinaryFile = isBinaryFile;
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function isBinaryFileSync(file, size) {
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if (isString(file)) {
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const stat = fs.statSync(file);
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isStatFile(stat);
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const fileDescriptor = fs.openSync(file, 'r');
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const allocBuffer = Buffer.alloc(MAX_BYTES);
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const bytesRead = fs.readSync(fileDescriptor, allocBuffer, 0, MAX_BYTES, 0);
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fs.closeSync(fileDescriptor);
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return isBinaryCheck(allocBuffer, bytesRead);
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}
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else {
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if (size === undefined) {
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size = file.length;
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}
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return isBinaryCheck(file, size);
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}
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}
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exports.isBinaryFileSync = isBinaryFileSync;
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function isBinaryCheck(fileBuffer, bytesRead) {
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// empty file. no clue what it is.
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if (bytesRead === 0) {
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return false;
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}
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let suspiciousBytes = 0;
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const totalBytes = Math.min(bytesRead, MAX_BYTES);
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// UTF-8 BOM
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if (bytesRead >= 3 && fileBuffer[0] === 0xef && fileBuffer[1] === 0xbb && fileBuffer[2] === 0xbf) {
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return false;
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}
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// UTF-32 BOM
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if (bytesRead >= 4 &&
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fileBuffer[0] === 0x00 &&
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fileBuffer[1] === 0x00 &&
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fileBuffer[2] === 0xfe &&
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fileBuffer[3] === 0xff) {
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return false;
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}
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// UTF-32 LE BOM
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if (bytesRead >= 4 &&
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fileBuffer[0] === 0xff &&
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fileBuffer[1] === 0xfe &&
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fileBuffer[2] === 0x00 &&
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fileBuffer[3] === 0x00) {
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return false;
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}
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// GB BOM
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if (bytesRead >= 4 &&
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fileBuffer[0] === 0x84 &&
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fileBuffer[1] === 0x31 &&
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fileBuffer[2] === 0x95 &&
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fileBuffer[3] === 0x33) {
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return false;
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}
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if (totalBytes >= 5 && fileBuffer.slice(0, 5).toString() === '%PDF-') {
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/* PDF. This is binary. */
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return true;
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}
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// UTF-16 BE BOM
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if (bytesRead >= 2 && fileBuffer[0] === 0xfe && fileBuffer[1] === 0xff) {
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return false;
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}
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// UTF-16 LE BOM
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if (bytesRead >= 2 && fileBuffer[0] === 0xff && fileBuffer[1] === 0xfe) {
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return false;
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}
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for (let i = 0; i < totalBytes; i++) {
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if (fileBuffer[i] === 0) {
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// NULL byte--it's binary!
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return true;
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}
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else if ((fileBuffer[i] < 7 || fileBuffer[i] > 14) && (fileBuffer[i] < 32 || fileBuffer[i] > 127)) {
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// UTF-8 detection
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if (fileBuffer[i] > 193 && fileBuffer[i] < 224 && i + 1 < totalBytes) {
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i++;
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if (fileBuffer[i] > 127 && fileBuffer[i] < 192) {
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continue;
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}
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}
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else if (fileBuffer[i] > 223 && fileBuffer[i] < 240 && i + 2 < totalBytes) {
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i++;
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if (fileBuffer[i] > 127 && fileBuffer[i] < 192 && fileBuffer[i + 1] > 127 && fileBuffer[i + 1] < 192) {
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i++;
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continue;
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}
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}
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suspiciousBytes++;
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// Read at least 32 fileBuffer before making a decision
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if (i >= 32 && (suspiciousBytes * 100) / totalBytes > 10) {
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return true;
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}
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}
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}
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if ((suspiciousBytes * 100) / totalBytes > 10) {
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return true;
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}
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if (suspiciousBytes > 1 && isBinaryProto(fileBuffer, totalBytes)) {
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return true;
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}
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return false;
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}
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function isString(x) {
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return typeof x === 'string';
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}
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function isStatFile(stat) {
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if (!stat.isFile()) {
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throw new Error(`Path provided was not a file!`);
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}
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}
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