js 判断是否为二进制文件

function isBinaryFile(buffer) {
    const binarySignature = [0xFF, 0xD8, 0xFF]; // JPEG 文件头
    for (let i = 0; i < binarySignature.length; i++) {
        if (buffer[i] !== binarySignature[i]) {
            return false;
        }
    }
    return true;
}

// 使用示例
const fs = require('fs');
const buffer = fs.readFileSync('path/to/file.jpg');
console.log(isBinaryFile(buffer)); // 输出: true 或 false

function isBinaryFile(buffer) {
    const binaryThreshold = 0.1; // 10% 的不可打印字符视为二进制文件
    let binaryCount = 0;
    for (let i = 0; i < buffer.length; i++) {
        if (buffer[i] < 32 || buffer[i] > 126) {
            binaryCount++;
        }
    }
    return (binaryCount / buffer.length) > binaryThreshold;
}

// 使用示例
const fs = require('fs');
const buffer = fs.readFileSync('path/to/file');
console.log(isBinaryFile(buffer)); // 输出: true 或 false

const mime = require('mime');

function isBinaryFile(filePath) {
    const mimeType = mime.getType(filePath);
    const binaryMimeTypes = ['application/octet-stream', 'application/pdf', 'image/jpeg', 'image/png']; // 示例二进制 MIME 类型
    return binaryMimeTypes.includes(mimeType);
}

// 使用示例
console.log(isBinaryFile('path/to/file.jpg')); // 输出: true 或 false