C# net core 从文件流中获取文件头、匹配文件类型

常用文件的文件头如下:

(以前六位为准) JPEG (jpg),文件头:FFD8FF

PNG (png),文件头:89504E47

GIF (gif),文件头:47494638

TIFF (tif),文件头:49492A00

Windows Bitmap (bmp),文件头:424D

CAD (dwg),文件头:41433130

Adobe Photoshop (psd),文件头:38425053

Rich Text Format (rtf),文件头:7B5C727466

XML (xml),文件头:3C3F786D6C

HTML (html),文件头:68746D6C3E

Email [thorough only] (eml),文件头:44656C69766572792D646174653A

Outlook Express (dbx),文件头:CFAD12FEC5FD746F

Outlook (pst),文件头:2142444E

MS Word/Excel (xls.or.doc),文件头:D0CF11E0

MS Access (mdb),文件头:5374616E64617264204A

WordPerfect (wpd),文件头:FF575043

Postscript (eps.or.ps),文件头:252150532D41646F6265

Adobe Acrobat (pdf),文件头:255044462D312E

Quicken (qdf),文件头:AC9EBD8F

Windows Password (pwl),文件头:E3828596

ZIP Archive (zip),文件头:504B0304

RAR Archive (rar),文件头:52617221

Wave (wav),文件头:57415645

AVI (avi),文件头:41564920

Real Audio (ram),文件头:2E7261FD

Real Media (rm),文件头:2E524D46

MPEG (mpg),文件头:000001BA

MPEG (mpg),文件头:000001B3

Quicktime (mov),文件头:6D6F6F76

Windows Media (asf),文件头:3026B2758E66CF11

MIDI (mid),文件头:4D546864 

 

 

///
filetype  文件后缀。如.doc

downdata byte[]文件流

///
public bool CheckFileheader(string filetype,byte[] downdata) { if(downdata == null || downdata.Count() <= 0) return false; StringBuilder sbmodel = new StringBuilder(); int filetitlecount = 4; if(".jpeg,jpg".Contains(filetype))filetitlecount = 3; for(int i = 0;i< filetitlecount;i++) { int v = downdata[i] & 0xFF; string str16 = Convert.ToString(v,16).ToUpper(); sbmodel.Append(str16); } if(sbmodel.ToString() == "D0CF11E0" || sbmodel.ToString() == "504B0304" || sbmodel.ToString() == "504B34" ) return true; else return false; }

 

posted @ 2022-06-22 16:39  zwbsoft  阅读(608)  评论(0编辑  收藏  举报