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Mini Shell
Mini Shell
/**
* Copyright 2013-2022 the PM2 project authors. All rights reserved.
* Use of this source code is governed by a license that
* can be found in the LICENSE file.
*/
var fs = require('fs');
var max_bytes = 512;
module.exports = function(bytes, size) {
// Read the file with no encoding for raw buffer access.
if (size === undefined) {
var file = bytes;
try {
if(!fs.statSync(file).isFile()) return false;
} catch (err) {
// otherwise continue on
}
var descriptor = fs.openSync(file, 'r');
try {
bytes = Buffer.alloc(max_bytes);
size = fs.readSync(descriptor, bytes, 0, bytes.length, 0);
} finally {
fs.closeSync(descriptor);
}
}
// async version has a function instead of a `size`
else if (typeof size === "function") {
var file = bytes, callback = size;
fs.stat(file, function(err, stat) {
if (err || !stat.isFile()) return callback(null, false);
fs.open(file, 'r', function(err, descriptor){
if (err) return callback(err);
var bytes = Buffer.alloc(max_bytes);
// Read the file with no encoding for raw buffer access.
fs.read(descriptor, bytes, 0, bytes.length, 0, function(err, size, bytes){
fs.close(descriptor, function(err2){
if (err || err2)
return callback(err || err2);
return callback(null, isBinaryCheck(bytes, size));
});
});
});
});
}
return isBinaryCheck(bytes, size);
}
function isBinaryCheck(bytes, size) {
if (size === 0)
return false;
var suspicious_bytes = 0;
var total_bytes = Math.min(size, max_bytes);
if (size >= 3 && bytes[0] == 0xEF && bytes[1] == 0xBB && bytes[2] == 0xBF) {
// UTF-8 BOM. This isn't binary.
return false;
}
for (var i = 0; i < total_bytes; i++) {
if (bytes[i] === 0) { // NULL byte--it's binary!
return true;
}
else if ((bytes[i] < 7 || bytes[i] > 14) && (bytes[i] < 32 || bytes[i] > 127)) {
// UTF-8 detection
if (bytes[i] > 193 && bytes[i] < 224 && i + 1 < total_bytes) {
i++;
if (bytes[i] > 127 && bytes[i] < 192) {
continue;
}
}
else if (bytes[i] > 223 && bytes[i] < 240 && i + 2 < total_bytes) {
i++;
if (bytes[i] > 127 && bytes[i] < 192 && bytes[i + 1] > 127 && bytes[i + 1] < 192) {
i++;
continue;
}
}
suspicious_bytes++;
// Read at least 32 bytes before making a decision
if (i > 32 && (suspicious_bytes * 100) / total_bytes > 10) {
return true;
}
}
}
if ((suspicious_bytes * 100) / total_bytes > 10) {
return true;
}
return false;
}
Zerion Mini Shell 1.0