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test.js
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test.js
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const readChunk = require('read-chunk'); // npm install read-chunk
//const isPng = require('is-png');
//测试用依赖
const fs = require('fs');
const path = require('path');
const file_type = require('./file_type');
//测试用依赖
//check();
check_method();
//测试check_file_type
function check(){
var file_path = __dirname+"\\test"
var files = fs.readdirSync(file_path);
files.forEach(function (file_name, index) {
//var stat = fs.statSync(path + itm);
//if (stat.isDirectory()) {
//console.log(file_name+":"+index);
var type = path.parse(file_name).ext.toLowerCase();
var result = check_file_type(file_path+"\\"+file_name,type);
console.log(file_name+"'s type is "+type+",check result:"+result);
});
}
//测试各个is方法
function check_method(){
var file_path = __dirname+"\\test"
var files = fs.readdirSync(file_path);
files.forEach(function (file_name, index) {
var type = path.parse(file_name).ext.toLowerCase();
type = type.substr(1,type.length-1);
var result = false;
var new_path = file_path+"\\"+file_name;
switch(type){
case 'png':
result = file_type.isPng(new_path);
break;
case 'pdf':
result = file_type.isPdf(new_path);
break;
case 'zip':
result = file_type.isZip(new_path);
break;
case '7z':
result = file_type.is7z(new_path);
break;
case 'rar':
result = file_type.isRar(new_path);
break;
case 'xls':
result = file_type.isXls(new_path);
break;
case 'xlsx':
result = file_type.isXlsx(new_path);
break;
case 'doc':
result = file_type.isDoc(new_path);
break;
case 'docx':
result = file_type.isDocx(new_path);
break;
case 'jpg':
result = file_type.isJpg(new_path);
break;
case 'jpeg':
result = file_type.isJpeg(new_path);
break;
default:
result = false;
break;
}
console.log(file_name+"'s type is "+type+",check result:"+result);
});
}
//检查文件类型
function check_file_type(file_path,type){
const buffer = readChunk.sync(file_path, 0, 8);
if (!buffer || buffer.length < 8 || !type) {
return false;
}
var result = false;
//转为小写
type = type.toLowerCase();
if(type.indexOf(".") == 0){
//支持传入后缀
type = type.substr(1,type.length-1);
}
//判断类型
switch(type){
case 'png':
result = (
buffer[0] === 0x89 &&
buffer[1] === 0x50 &&
buffer[2] === 0x4E &&
buffer[3] === 0x47 &&
buffer[4] === 0x0D &&
buffer[5] === 0x0A &&
buffer[6] === 0x1A &&
buffer[7] === 0x0A
);
break;
case 'pdf':
result = (
buffer[0] === 0x25 &&
buffer[1] === 0x50 &&
buffer[2] === 0x44 &&
buffer[3] === 0x46
);
break;
case 'zip':
result = ((
buffer[0] === 0x50 &&
buffer[1] === 0x4B &&
buffer[2] === 0x03 &&
buffer[3] === 0x04
) || (
buffer[0] === 0x50 &&
buffer[1] === 0x4B &&
buffer[2] === 0x4C &&
buffer[3] === 0x49 &&
buffer[4] === 0x54 &&
buffer[5] === 0x45
) || (
buffer[0] === 0x50 &&
buffer[1] === 0x4B &&
buffer[2] === 0x53 &&
buffer[3] === 0x70 &&
buffer[4] === 0x58
) || (
buffer[0] === 0x50 &&
buffer[1] === 0x4B &&
buffer[2] === 0x05 &&
buffer[3] === 0x06
) || (
buffer[0] === 0x50 &&
buffer[1] === 0x4B &&
buffer[2] === 0x07 &&
buffer[3] === 0x08
) || (
buffer[0] === 0x57 &&
buffer[1] === 0x69 &&
buffer[2] === 0x6E &&
buffer[3] === 0x5A &&
buffer[4] === 0x69 &&
buffer[5] === 0x70
) || (
buffer[0] === 0x50 &&
buffer[1] === 0x4B &&
buffer[2] === 0x03 &&
buffer[3] === 0x04 &&
buffer[4] === 0x14 &&
buffer[5] === 0x00 &&
buffer[6] === 0x01 &&
buffer[7] === 0x00
) ) ;
break;
case '7z':
result = (
buffer[0] === 0x37 &&
buffer[1] === 0x7A &&
buffer[2] === 0xBC &&
buffer[3] === 0xAF &&
buffer[4] === 0x27 &&
buffer[5] === 0x1C
);
break;
case 'rar':
result = (
buffer[0] === 0x52 &&
buffer[1] === 0x61 &&
buffer[2] === 0x72 &&
buffer[3] === 0x21 &&
buffer[4] === 0x1A &&
buffer[5] === 0x07 &&
buffer[6] === 0x00
);
break;
case 'xls':
result = ((
buffer[0] === 0xD0 &&
buffer[1] === 0xCF &&
buffer[2] === 0x11 &&
buffer[3] === 0xE0 &&
buffer[4] === 0xA1 &&
buffer[5] === 0xB1 &&
buffer[6] === 0x1A &&
buffer[7] === 0xE1
) || (
buffer[0] === 0x09 &&
buffer[1] === 0x08 &&
buffer[2] === 0x10 &&
buffer[3] === 0x00 &&
buffer[4] === 0x00 &&
buffer[5] === 0x06 &&
buffer[6] === 0x05 &&
buffer[7] === 0x00
) || (
buffer[0] === 0xFD &&
buffer[1] === 0xFF &&
buffer[2] === 0xFF &&
buffer[3] === 0xFF &&
buffer[4] === 0x10
) || (
buffer[0] === 0xFD &&
buffer[1] === 0xFF &&
buffer[2] === 0xFF &&
buffer[3] === 0xFF &&
buffer[4] === 0x1F
) || (
buffer[0] === 0xFD &&
buffer[1] === 0xFF &&
buffer[2] === 0xFF &&
buffer[3] === 0xFF &&
buffer[4] === 0x22
) || (
buffer[0] === 0xFD &&
buffer[1] === 0xFF &&
buffer[2] === 0xFF &&
buffer[3] === 0xFF &&
buffer[4] === 0x23
) || (
buffer[0] === 0xFD &&
buffer[1] === 0xFF &&
buffer[2] === 0xFF &&
buffer[3] === 0xFF &&
buffer[4] === 0x23
) || (
buffer[0] === 0xFD &&
buffer[1] === 0xFF &&
buffer[2] === 0xFF &&
buffer[3] === 0xFF &&
buffer[4] === 0x29
) ) ;
break;
case 'xlsx':
result = ( (
buffer[0] === 0x50 &&
buffer[1] === 0x4B &&
buffer[2] === 0x03 &&
buffer[3] === 0x04
) || (
buffer[0] === 0x50 &&
buffer[1] === 0x4B &&
buffer[2] === 0x03 &&
buffer[3] === 0x04 &&
buffer[4] === 0x14 &&
buffer[5] === 0x00 &&
buffer[6] === 0x06 &&
buffer[7] === 0x00 )
);
break;
case 'doc':
result = ((
buffer[0] === 0xD0 &&
buffer[1] === 0xCF &&
buffer[2] === 0x11 &&
buffer[3] === 0xE0 &&
buffer[4] === 0xA1 &&
buffer[5] === 0xB1 &&
buffer[6] === 0x1A &&
buffer[7] === 0xE1
) || (
buffer[0] === 0x0D &&
buffer[1] === 0x44 &&
buffer[2] === 0x4F &&
buffer[3] === 0x43
) || (
buffer[0] === 0xCF &&
buffer[1] === 0x11 &&
buffer[2] === 0xE0 &&
buffer[3] === 0xA1 &&
buffer[4] === 0xB1 &&
buffer[5] === 0x1A &&
buffer[6] === 0xE1 &&
buffer[7] === 0x00
) || (
buffer[0] === 0xDB &&
buffer[1] === 0xA5 &&
buffer[2] === 0x2D &&
buffer[3] === 0x00
) || (
buffer[0] === 0xEC &&
buffer[1] === 0xA5 &&
buffer[2] === 0xC1 &&
buffer[3] === 0x00
)) ;
break;
case 'docx':
result = ( (
buffer[0] === 0x50 &&
buffer[1] === 0x4B &&
buffer[2] === 0x03 &&
buffer[3] === 0x04
) || (
buffer[0] === 0x50 &&
buffer[1] === 0x4B &&
buffer[2] === 0x03 &&
buffer[3] === 0x04 &&
buffer[4] === 0x14 &&
buffer[5] === 0x00 &&
buffer[6] === 0x06 &&
buffer[7] === 0x00
));
break;
case 'jpg':
result = ( (
buffer[0] === 0xFF &&
buffer[1] === 0xD8 &&
buffer[2] === 0xFF &&
buffer[3] === 0xE0
) || (
buffer[0] === 0xFF &&
buffer[1] === 0xD8 &&
buffer[2] === 0xFF &&
buffer[3] === 0xE1
) || (
buffer[0] === 0xFF &&
buffer[1] === 0xD8 &&
buffer[2] === 0xFF &&
buffer[3] === 0xE8 )
);
break;
case 'jpeg':
result = ( (
buffer[0] === 0xFF &&
buffer[1] === 0xD8 &&
buffer[2] === 0xFF &&
buffer[3] === 0xE0
) || (
buffer[0] === 0xFF &&
buffer[1] === 0xD8 &&
buffer[2] === 0xFF &&
buffer[3] === 0xE2
) || (
buffer[0] === 0xFF &&
buffer[1] === 0xD8 &&
buffer[2] === 0xFF &&
buffer[3] === 0xE3 )
);
break;
default:
result = false;
break;
}
return result;
}