• 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; }
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  • 原文地址:https://www.cnblogs.com/zwbsoft/p/16401177.html
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