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; }
本文来自博客园,作者:zwbsoft,转载请注明原文链接:https://www.cnblogs.com/zwbsoft/p/16401177.html
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