【.Net 6.0--通用帮助类--FileTypeCheckHelper】
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前言
文件格式检查帮助类，包含了以下常用的29种文件格式的检查：
1、文档格式：.DOC、.DOCX
2、PDF格式：.PDF
3、电子表格：.XLS、.XLSX
4、图片格式：.PNG、.JPG、.JPEG、.GIF、.BMP、.JFIF
5、视频格式：.MP4、.MKV、.MOV、.M4V、.WEBM、.WMV、.AVI、.FLV
6、压缩包格式：.ZIP
7、可执行文件：.EXE、.DLL、.DRV、.VXD、.SYS、.OCX、.VBX、.BAT、.DB
代码示例
using System;
using System.Collections.Generic;
using System.Linq;
namespace VW.API.Common.Utils
{
///
/// FileTypeCheckHelper 的摘要说明：文件格式检查帮助类
///
public class FileTypeCheckHelper
{
public enum EnumFileType
{
Word,
Pdf,
Excel,
Image,
Video,
Zip,
ExecuteFile
};
private readonly static Dictionary> _fileSignature = new Dictionary>
{
//文档格式
{ ".DOC", new List { new byte[] { 0xD0, 0xCF, 0x11, 0xE0, 0xA1, 0xB1, 0x1A, 0xE1 } } },
{ ".DOCX", new List { new byte[] { 0x50, 0x4B, 0x03, 0x04 } } },
//PDF格式
{ ".PDF", new List { new byte[] { 0x25, 0x50, 0x44, 0x46 } } },
//电子表格
{ ".XLS", new List {
new byte[] { 0xD0, 0xCF, 0x11, 0xE0, 0xA1, 0xB1, 0x1A, 0xE1 },
new byte[] { 0x09, 0x08, 0x10, 0x00, 0x00, 0x06, 0x05, 0x00 },
new byte[] { 0xFD, 0xFF, 0xFF, 0xFF } } },
{ ".XLSX", new List { new byte[] { 0x50, 0x4B, 0x03, 0x04 } } },
//图片格式
{ ".PNG", new List { new byte[] { 0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A } } },
{ ".JPG", new List {
new byte[] { 0xFF, 0xD8, 0xFF, 0xE0 },
new byte[] { 0xFF, 0xD8, 0xFF, 0xE1 },
new byte[] { 0xFF, 0xD8, 0xFF, 0xE8 } } },
{ ".JPEG", new List {
new byte[] { 0xFF, 0xD8, 0xFF, 0xE0 },
new byte[] { 0xFF, 0xD8, 0xFF, 0xE2 },
new byte[] { 0xFF, 0xD8, 0xFF, 0xE3 } } },
{ ".GIF", new List { new byte[] { 0x47, 0x49, 0x46, 0x38 } } },
{ ".BMP", new List { new byte[] { 0x42, 0x4D } } },
{ ".JFIF", new List { new byte[] { 0xFF, 0xD8, 0xFF, 0xE0, 0x00, 0x10, 0x4A, 0x46, 0x49, 0x46 } } },
//视频格式
{ ".MP4", new List {
new byte[] { 0x00,0x00,0x00,0x18,0x66,0x74,0x79,0x70,0x6D,0x70,0x34,0x32 },
new byte[] { 0x00,0x00,0x00,0x1C,0x66,0x74,0x79,0x70,0x6D,0x70,0x34,0x32 },
new byte[] { 0x00,0x00,0x00,0x20,0x66,0x74,0x79,0x70,0x69,0x73,0x6F, 0x6D } } },
{ ".MKV", new List { new byte[] { 0x1A, 0x45, 0xDF, 0xA3, 0xA3, 0x42, 0x86, 0x81, 0x01, 0x42, 0xF7 } } },
{ ".MOV", new List { new byte[] { 0x00, 0x00, 0x00, 0x14, 0x66, 0x74, 0x79, 0x70, 0x71, 0x74 } } },
{ ".M4V", new List { new byte[] { 0x00, 0x00, 0x00, 0x20, 0x66, 0x74, 0x79, 0x70, 0x4D, 0x34, 0x56 } } },
{ ".WEBM", new List { new byte[] { 0x1A, 0x45, 0xDF, 0xA3, 0x9F, 0x42, 0x86, 0x81, 0x01, 0x42, 0xF7, 0x81, 0x01, 0x42, 0xF2 } } },
{ ".WMV", new List { new byte[] { 0x30,0x26,0xB2,0x75,0x8E,0x66,0xCF,0x11 } } },
{ ".AVI", new List { new byte[] { 0x52, 0x49, 0x46, 0x46, 0x84, 0x4A, 0x1E, 0x00, 0x41, 0x56, 0x49 } } },
{ ".FLV", new List { new byte[] { 0x46, 0x4C, 0x56 } } },
//压缩包
{ ".ZIP", new List {
new byte[] { 0x50, 0x4B, 0x03, 0x04 },
new byte[] { 0x50, 0x4B, 0x4C, 0x49, 0x54, 0x55 },
new byte[] { 0x50, 0x4B, 0x53, 0x70, 0x58 },
new byte[] { 0x50, 0x4B, 0x05, 0x06 },
new byte[] { 0x50, 0x4B, 0x07, 0x08 },
new byte[] { 0x57, 0x69, 0x6E, 0x5A, 0x69, 0x70 } } },
//可执行文件
{ ".EXE", new List { new byte[] { 0x4D, 0x5A, 0x90, 0x00, 0x03 } } },
{ ".DLL", new List { new byte[] { 0x4D, 0x5A, 0x90, 0x00, 0x03 } } },
{ ".DRV", new List { new byte[] { 0x4D, 0x5A, 0x90, 0x00, 0x03 } } },
{ ".VXD", new List { new byte[] { 0x4D, 0x5A, 0x90, 0x00, 0x03 } } },
{ ".SYS", new List { new byte[] { 0x4D, 0x5A, 0x90, 0x00, 0x03 } } },
{ ".OCX", new List { new byte[] { 0x4D, 0x5A, 0x90, 0x00, 0x03 } } },
{ ".VBX", new List { new byte[] { 0x4D, 0x5A, 0x90, 0x00, 0x03 } } },
{ ".BAT", new List { new byte[] { 0x40, 0x65, 0x63, 0x68, 0x6F } } },
{ ".DB", new List { new byte[] { 0x53, 0x51, 0x4C, 0x69, 0x74 } } },
};
///
/// 格式检查
///
/// 后缀
/// 文件头字节数组，请传200个以内
/// sig = _fileSignature[ext];
foreach (byte[] b in sig)
{
var curFileSig = new byte[b.Length];
Array.Copy(fileData, curFileSig, b.Length);
if (curFileSig.SequenceEqual(b))
{
//验证格式通过
flag = true;
break;
}
}
return flag;
}
///
/// 格式检查
///
/// 后缀
/// 文件头字节数组，请传200个以内
///
/// 格式检查
///
/// 文件类型
/// 文件头字节数组，请传200个以内
/// exts = new List();
switch (enumFileType)
{
case EnumFileType.Word:
exts.AddRange(new List { ".DOC", ".DOCX" });
break;
case EnumFileType.Pdf:
exts.AddRange(new List { ".PDF" });
break;
case EnumFileType.Excel:
exts.AddRange(new List { ".XLS", ".XLSX" });
break;
case EnumFileType.Image:
exts.AddRange(new List { ".PNG", ".JPG", ".JPEG", ".GIF", ".BMP", ".JFIF" });
break;
case EnumFileType.Video:
exts.AddRange(new List { ".MP4", ".MKV", ".MOV", ".M4V", ".WEBM", ".WMV", ".AVI", ".FLV" });
break;
case EnumFileType.Zip:
exts.AddRange(new List { ".ZIP" });
break;
case EnumFileType.ExecuteFile:
exts.AddRange(new List { ".EXE", ".DLL", ".DRV", ".VXD", ".SYS", ".OCX", ".VBX", ".BAT", "DB" });
break;
}
foreach (string ext in exts)
{
flag = CheckExtension(ext, fileData);
if (flag)
break;
}
return flag;
}
///
/// 格式检查
///
/// 文件类型
/// 文件头字节数组，请传200个以内
///