#region Imports

using System;
using System.Collections.Generic;
using System.Linq;
using System.Collections;
using System.Configuration;
using System.IO;

#endregion

public static class MimeMap
{
    public const string ApplicationOctetStream = "application/octet-stream";

    private static readonly Dictionary<string, string> _map;

    static MimeMap()
    {
        _map = CreateDefaultMap();
    }

    public static string ContentTypeFromPath(string path)
    {
        return ContentTypeFromExtension(Path.GetExtension(path));
    }

    public static string ContentTypeFromExtension(string extension)
    {
        extension = extension ?? string.Empty;
        
        if (extension.Length > 0)
        {
            if (extension[0] != '.')
                throw new ArgumentOutOfRangeException("extension");
            
            if (extension.Length == 1)
                extension = string.Empty;
        }

        var contentType = _map[extension];
        return !string.IsNullOrEmpty(contentType) ? contentType : ApplicationOctetStream;
    }

    #region Default MIME map

    private static Dictionary<string, string> CreateDefaultMap()
    {
        var map = new Dictionary<string, string>(
            /* capacity */ 220,
            /* comparer */ StringComparer.OrdinalIgnoreCase)
        {
            { ".323"    , "text/h323" },
            { ".asx"    , "video/x-ms-asf" },
            { ".acx"    , "application/internet-property-stream" },
            { ".ai"     , "application/postscript" },
            { ".aif"    , "audio/x-aiff" },
            { ".aiff"   , "audio/aiff" },
            { ".axs"    , "application/olescript" },
            { ".aifc"   , "audio/aiff" },
            { ".asr"    , "video/x-ms-asf" },
            { ".avi"    , "video/x-msvideo" },
            { ".asf"    , "video/x-ms-asf" },
            { ".au"     , "audio/basic" },
            { ".bin"    , "application/octet-stream" },
            { ".bas"    , "text/plain" },
            { ".bcpio"  , "application/x-bcpio" },
            { ".bmp"    , "image/bmp" },
            { ".cdf"    , "application/x-cdf" },
            { ".cat"    , "application/vndms-pkiseccat" },
            { ".crt"    , "application/x-x509-ca-cert" },
            { ".c"      , "text/plain" },
            { ".css"    , "text/css" },
            { ".cer"    , "application/x-x509-ca-cert" },
            { ".crl"    , "application/pkix-crl" },
            { ".cmx"    , "image/x-cmx" },
            { ".csh"    , "application/x-csh" },
            { ".cod"    , "image/cis-cod" },
            { ".cpio"   , "application/x-cpio" },
            { ".clp"    , "application/x-msclip" },
            { ".crd"    , "application/x-mscardfile" },
            { ".dll"    , "application/x-msdownload" },
            { ".dot"    , "application/msword" },
            { ".doc"    , "application/msword" },
            { ".dvi"    , "application/x-dvi" },
            { ".dir"    , "application/x-director" },
            { ".dxr"    , "application/x-director" },
            { ".der"    , "application/x-x509-ca-cert" },
            { ".dib"    , "image/bmp" },
            { ".dcr"    , "application/x-director" },
            { ".disco"  , "text/xml" },
            { ".exe"    , "application/octet-stream" },
            { ".etx"    , "text/x-setext" },
            { ".evy"    , "application/envoy" },
            { ".eml"    , "message/rfc822" },
            { ".eps"    , "application/postscript" },
            { ".flr"    , "x-world/x-vrml" },
            { ".fif"    , "application/fractals" },
            { ".gtar"   , "application/x-gtar" },
            { ".gif"    , "image/gif" },
            { ".gz"     , "application/x-gzip" },
            { ".hta"    , "application/hta" },
            { ".htc"    , "text/x-component" },
            { ".htt"    , "text/webviewhtml" },
            { ".h"      , "text/plain" },
            { ".hdf"    , "application/x-hdf" },
            { ".hlp"    , "application/winhlp" },
            { ".html"   , "text/html" },
            { ".htm"    , "text/html" },
            { ".hqx"    , "application/mac-binhex40" },
            { ".isp"    , "application/x-internet-signup" },
            { ".iii"    , "application/x-iphone" },
            { ".ief"    , "image/ief" },
            { ".ivf"    , "video/x-ivf" },
            { ".ins"    , "application/x-internet-signup" },
            { ".ico"    , "image/x-icon" },
            { ".jpg"    , "image/jpeg" },
            { ".jfif"   , "image/pjpeg" },
            { ".jpe"    , "image/jpeg" },
            { ".jpeg"   , "image/jpeg" },
            { ".js"     , "application/x-javascript" },
            { ".lsx"    , "video/x-la-asf" },
            { ".latex"  , "application/x-latex" },
            { ".lsf"    , "video/x-la-asf" },
            { ".mhtml"  , "message/rfc822" },
            { ".mny"    , "application/x-msmoney" },
            { ".mht"    , "message/rfc822" },
            { ".mid"    , "audio/mid" },
            { ".mpv2"   , "video/mpeg" },
            { ".man"    , "application/x-troff-man" },
            { ".mvb"    , "application/x-msmediaview" },
            { ".mpeg"   , "video/mpeg" },
            { ".m3u"    , "audio/x-mpegurl" },
            { ".mdb"    , "application/x-msaccess" },
            { ".mpp"    , "application/vnd.ms-project" },
            { ".m1v"    , "video/mpeg" },
            { ".mpa"    , "video/mpeg" },
            { ".me"     , "application/x-troff-me" },
            { ".m13"    , "application/x-msmediaview" },
            { ".movie"  , "video/x-sgi-movie" },
            { ".m14"    , "application/x-msmediaview" },
            { ".mpe"    , "video/mpeg" },
            { ".mp2"    , "video/mpeg" },
            { ".mov"    , "video/quicktime" },
            { ".mp3"    , "audio/mpeg" },
            { ".mpg"    , "video/mpeg" },
            { ".ms"     , "application/x-troff-ms" },
            { ".nc"     , "application/x-netcdf" },
            { ".nws"    , "message/rfc822" },
            { ".oda"    , "application/oda" },
            { ".ods"    , "application/oleobject" },
            { ".pmc"    , "application/x-perfmon" },
            { ".p7r"    , "application/x-pkcs7-certreqresp" },
            { ".p7b"    , "application/x-pkcs7-certificates" },
            { ".p7s"    , "application/pkcs7-signature" },
            { ".pmw"    , "application/x-perfmon" },
            { ".ps"     , "application/postscript" },
            { ".p7c"    , "application/pkcs7-mime" },
            { ".pbm"    , "image/x-portable-bitmap" },
            { ".ppm"    , "image/x-portable-pixmap" },
            { ".pub"    , "application/x-mspublisher" },
            { ".png"    , "image/png" },
            { ".pnm"    , "image/x-portable-anymap" },
            { ".pml"    , "application/x-perfmon" },
            { ".p10"    , "application/pkcs10" },
            { ".pfx"    , "application/x-pkcs12" },
            { ".p12"    , "application/x-pkcs12" },
            { ".pdf"    , "application/pdf" },
            { ".pps"    , "application/vnd.ms-powerpoint" },
            { ".p7m"    , "application/pkcs7-mime" },
            { ".pko"    , "application/vndms-pkipko" },
            { ".ppt"    , "application/vnd.ms-powerpoint" },
            { ".pmr"    , "application/x-perfmon" },
            { ".pma"    , "application/x-perfmon" },
            { ".pot"    , "application/vnd.ms-powerpoint" },
            { ".prf"    , "application/pics-rules" },
            { ".pgm"    , "image/x-portable-graymap" },
            { ".qt"     , "video/quicktime" },
            { ".ra"     , "audio/x-pn-realaudio" },
            { ".rgb"    , "image/x-rgb" },
            { ".ram"    , "audio/x-pn-realaudio" },
            { ".rmi"    , "audio/mid" },
            { ".ras"    , "image/x-cmu-raster" },
            { ".roff"   , "application/x-troff" },
            { ".rtf"    , "application/rtf" },
            { ".rtx"    , "text/richtext" },
            { ".sv4crc" , "application/x-sv4crc" },
            { ".spc"    , "application/x-pkcs7-certificates" },
            { ".setreg" , "application/set-registration-initiation" },
            { ".snd"    , "audio/basic" },
            { ".stl"    , "application/vndms-pkistl" },
            { ".setpay" , "application/set-payment-initiation" },
            { ".stm"    , "text/html" },
            { ".shar"   , "application/x-shar" },
            { ".sh"     , "application/x-sh" },
            { ".sit"    , "application/x-stuffit" },
            { ".spl"    , "application/futuresplash" },
            { ".sct"    , "text/scriptlet" },
            { ".scd"    , "application/x-msschedule" },
            { ".sst"    , "application/vndms-pkicertstore" },
            { ".src"    , "application/x-wais-source" },
            { ".sv4cpio", "application/x-sv4cpio" },
            { ".tex"    , "application/x-tex" },
            { ".tgz"    , "application/x-compressed" },
            { ".t"      , "application/x-troff" },
            { ".tar"    , "application/x-tar" },
            { ".tr"     , "application/x-troff" },
            { ".tif"    , "image/tiff" },
            { ".txt"    , "text/plain" },
            { ".texinfo", "application/x-texinfo" },
            { ".trm"    , "application/x-msterminal" },
            { ".tiff"   , "image/tiff" },
            { ".tcl"    , "application/x-tcl" },
            { ".texi"   , "application/x-texinfo" },
            { ".tsv"    , "text/tab-separated-values" },
            { ".ustar"  , "application/x-ustar" },
            { ".uls"    , "text/iuls" },
            { ".vcf"    , "text/x-vcard" },
            { ".wps"    , "application/vnd.ms-works" },
            { ".wav"    , "audio/wav" },
            { ".wrz"    , "x-world/x-vrml" },
            { ".wri"    , "application/x-mswrite" },
            { ".wks"    , "application/vnd.ms-works" },
            { ".wmf"    , "application/x-msmetafile" },
            { ".wcm"    , "application/vnd.ms-works" },
            { ".wrl"    , "x-world/x-vrml" },
            { ".wdb"    , "application/vnd.ms-works" },
            { ".wsdl"   , "text/xml" },
            { ".xml"    , "text/xml" },
            { ".xlm"    , "application/vnd.ms-excel" },
            { ".xaf"    , "x-world/x-vrml" },
            { ".xla"    , "application/vnd.ms-excel" },
            { ".xls"    , "application/vnd.ms-excel" },
            { ".xof"    , "x-world/x-vrml" },
            { ".xlt"    , "application/vnd.ms-excel" },
            { ".xlc"    , "application/vnd.ms-excel" },
            { ".xsl"    , "text/xml" },
            { ".xbm"    , "image/x-xbitmap" },
            { ".xlw"    , "application/vnd.ms-excel" },
            { ".xpm"    , "image/x-xpixmap" },
            { ".xwd"    , "image/x-xwindowdump" },
            { ".xsd"    , "text/xml" },
            { ".z"      , "application/x-compress" },
            { ".zip"    , "application/x-zip-compressed" },
            { ".*"      , "application/octet-stream" },
            // Office 2007 MIME types
            // http://www.bram.us/2007/05/25/office-2007-mime-types-for-iis/
            { ".docm"   , "application/vnd.ms-word.document.macroEnabled.12" },
            { ".docx"   , "application/vnd.openxmlformats-officedocument.wordprocessingml.document" },
            { ".dotm"   , "application/vnd.ms-word.template.macroEnabled.12" },
            { ".dotx"   , "application/vnd.openxmlformats-officedocument.wordprocessingml.template" },
            { ".potm"   , "application/vnd.ms-powerpoint.template.macroEnabled.12" },
            { ".potx"   , "application/vnd.openxmlformats-officedocument.presentationml.template" },
            { ".ppam"   , "application/vnd.ms-powerpoint.addin.macroEnabled.12" },
            { ".ppsm"   , "application/vnd.ms-powerpoint.slideshow.macroEnabled.12" },
            { ".ppsx"   , "application/vnd.openxmlformats-officedocument.presentationml.slideshow" },
            { ".pptm"   , "application/vnd.ms-powerpoint.presentation.macroEnabled.12" },
            { ".pptx"   , "application/vnd.openxmlformats-officedocument.presentationml.presentation" },
            { ".xlam"   , "application/vnd.ms-excel.addin.macroEnabled.12" },
            { ".xlsb"   , "application/vnd.ms-excel.sheet.binary.macroEnabled.12" },
            { ".xlsm"   , "application/vnd.ms-excel.sheet.macroEnabled.12" },
            { ".xlsx"   , "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" },
            { ".xltm"   , "application/vnd.ms-excel.template.macroEnabled.12" },
            { ".xltx"   , "application/vnd.openxmlformats-officedocument.spreadsheetml.template" },
        };

        //
        // NOTE! If you add more MIME mappings here, do not forget to
        // update the capacity of the hashtable.
        //

        return map;
    }

    #endregion
}