package com.fsck.k9.mail.internet;

import com.fsck.k9.mail.Body;
import com.fsck.k9.mail.BodyPart;
import com.fsck.k9.mail.Message;
import com.fsck.k9.mail.MessagingException;
import com.fsck.k9.mail.Multipart;
import com.fsck.k9.mail.Part;

import org.apache.commons.io.IOUtils;
import org.apache.james.mime4j.codec.Base64InputStream;
import org.apache.james.mime4j.codec.QuotedPrintableInputStream;
import org.apache.james.mime4j.util.MimeUtil;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import java.util.Set;
import java.util.regex.Pattern;


public class MimeUtility {
    public static final String DEFAULT_ATTACHMENT_MIME_TYPE = "application/octet-stream";
    public static final String K9_SETTINGS_MIME_TYPE = "application/x-k9settings";

    /*
     * http://www.w3schools.com/media/media_mimeref.asp
     * +
     * http://www.stdicon.com/mimetypes
     */
    private static final String[][] MIME_TYPE_BY_EXTENSION_MAP = new String[][] {
        //* Do not delete the next two lines
    { "", DEFAULT_ATTACHMENT_MIME_TYPE },
    { "k9s", K9_SETTINGS_MIME_TYPE},
    //* Do not delete the previous two lines
    { "123", "application/vnd.lotus-1-2-3"},
    { "323", "text/h323"},
    { "3dml", "text/vnd.in3d.3dml"},
    { "3g2", "video/3gpp2"},
    { "3gp", "video/3gpp"},
    { "aab", "application/x-authorware-bin"},
    { "aac", "audio/x-aac"},
    { "aam", "application/x-authorware-map"},
    { "a", "application/octet-stream"},
    { "aas", "application/x-authorware-seg"},
    { "abw", "application/x-abiword"},
    { "acc", "application/vnd.americandynamics.acc"},
    { "ace", "application/x-ace-compressed"},
    { "acu", "application/vnd.acucobol"},
    { "acutc", "application/vnd.acucorp"},
    { "acx", "application/internet-property-stream"},
    { "adp", "audio/adpcm"},
    { "aep", "application/vnd.audiograph"},
    { "afm", "application/x-font-type1"},
    { "afp", "application/vnd.ibm.modcap"},
    { "ai", "application/postscript"},
    { "aif", "audio/x-aiff"},
    { "aifc", "audio/x-aiff"},
    { "aiff", "audio/x-aiff"},
    { "air", "application/vnd.adobe.air-application-installer-package+zip"},
    { "ami", "application/vnd.amiga.ami"},
    { "apk", "application/vnd.android.package-archive"},
    { "application", "application/x-ms-application"},
    { "apr", "application/vnd.lotus-approach"},
    { "asc", "application/pgp-signature"},
    { "asf", "video/x-ms-asf"},
    { "asm", "text/x-asm"},
    { "aso", "application/vnd.accpac.simply.aso"},
    { "asr", "video/x-ms-asf"},
    { "asx", "video/x-ms-asf"},
    { "atc", "application/vnd.acucorp"},
    { "atom", "application/atom+xml"},
    { "atomcat", "application/atomcat+xml"},
    { "atomsvc", "application/atomsvc+xml"},
    { "atx", "application/vnd.antix.game-component"},
    { "au", "audio/basic"},
    { "avi", "video/x-msvideo"},
    { "aw", "application/applixware"},
    { "axs", "application/olescript"},
    { "azf", "application/vnd.airzip.filesecure.azf"},
    { "azs", "application/vnd.airzip.filesecure.azs"},
    { "azw", "application/vnd.amazon.ebook"},
    { "bas", "text/plain"},
    { "bat", "application/x-msdownload"},
    { "bcpio", "application/x-bcpio"},
    { "bdf", "application/x-font-bdf"},
    { "bdm", "application/vnd.syncml.dm+wbxml"},
    { "bh2", "application/vnd.fujitsu.oasysprs"},
    { "bin", "application/octet-stream"},
    { "bmi", "application/vnd.bmi"},
    { "bmp", "image/bmp"},
    { "book", "application/vnd.framemaker"},
    { "box", "application/vnd.previewsystems.box"},
    { "boz", "application/x-bzip2"},
    { "bpk", "application/octet-stream"},
    { "btif", "image/prs.btif"},
    { "bz2", "application/x-bzip2"},
    { "bz", "application/x-bzip"},
    { "c4d", "application/vnd.clonk.c4group"},
    { "c4f", "application/vnd.clonk.c4group"},
    { "c4g", "application/vnd.clonk.c4group"},
    { "c4p", "application/vnd.clonk.c4group"},
    { "c4u", "application/vnd.clonk.c4group"},
    { "cab", "application/vnd.ms-cab-compressed"},
    { "car", "application/vnd.curl.car"},
    { "cat", "application/vnd.ms-pki.seccat"},
    { "cct", "application/x-director"},
    { "cc", "text/x-c"},
    { "ccxml", "application/ccxml+xml"},
    { "cdbcmsg", "application/vnd.contact.cmsg"},
    { "cdf", "application/x-cdf"},
    { "cdkey", "application/vnd.mediastation.cdkey"},
    { "cdx", "chemical/x-cdx"},
    { "cdxml", "application/vnd.chemdraw+xml"},
    { "cdy", "application/vnd.cinderella"},
    { "cer", "application/x-x509-ca-cert"},
    { "cgm", "image/cgm"},
    { "chat", "application/x-chat"},
    { "chm", "application/vnd.ms-htmlhelp"},
    { "chrt", "application/vnd.kde.kchart"},
    { "cif", "chemical/x-cif"},
    { "cii", "application/vnd.anser-web-certificate-issue-initiation"},
    { "cla", "application/vnd.claymore"},
    { "class", "application/java-vm"},
    { "clkk", "application/vnd.crick.clicker.keyboard"},
    { "clkp", "application/vnd.crick.clicker.palette"},
    { "clkt", "application/vnd.crick.clicker.template"},
    { "clkw", "application/vnd.crick.clicker.wordbank"},
    { "clkx", "application/vnd.crick.clicker"},
    { "clp", "application/x-msclip"},
    { "cmc", "application/vnd.cosmocaller"},
    { "cmdf", "chemical/x-cmdf"},
    { "cml", "chemical/x-cml"},
    { "cmp", "application/vnd.yellowriver-custom-menu"},
    { "cmx", "image/x-cmx"},
    { "cod", "application/vnd.rim.cod"},
    { "com", "application/x-msdownload"},
    { "conf", "text/plain"},
    { "cpio", "application/x-cpio"},
    { "cpp", "text/x-c"},
    { "cpt", "application/mac-compactpro"},
    { "crd", "application/x-mscardfile"},
    { "crl", "application/pkix-crl"},
    { "crt", "application/x-x509-ca-cert"},
    { "csh", "application/x-csh"},
    { "csml", "chemical/x-csml"},
    { "csp", "application/vnd.commonspace"},
    { "css", "text/css"},
    { "cst", "application/x-director"},
    { "csv", "text/csv"},
    { "c", "text/plain"},
    { "cu", "application/cu-seeme"},
    { "curl", "text/vnd.curl"},
    { "cww", "application/prs.cww"},
    { "cxt", "application/x-director"},
    { "cxx", "text/x-c"},
    { "daf", "application/vnd.mobius.daf"},
    { "dataless", "application/vnd.fdsn.seed"},
    { "davmount", "application/davmount+xml"},
    { "dcr", "application/x-director"},
    { "dcurl", "text/vnd.curl.dcurl"},
    { "dd2", "application/vnd.oma.dd2+xml"},
    { "ddd", "application/vnd.fujixerox.ddd"},
    { "deb", "application/x-debian-package"},
    { "def", "text/plain"},
    { "deploy", "application/octet-stream"},
    { "der", "application/x-x509-ca-cert"},
    { "dfac", "application/vnd.dreamfactory"},
    { "dic", "text/x-c"},
    { "diff", "text/plain"},
    { "dir", "application/x-director"},
    { "dis", "application/vnd.mobius.dis"},
    { "dist", "application/octet-stream"},
    { "distz", "application/octet-stream"},
    { "djv", "image/vnd.djvu"},
    { "djvu", "image/vnd.djvu"},
    { "dll", "application/x-msdownload"},
    { "dmg", "application/octet-stream"},
    { "dms", "application/octet-stream"},
    { "dna", "application/vnd.dna"},
    { "doc", "application/msword"},
    { "docm", "application/vnd.ms-word.document.macroenabled.12"},
    { "docx", "application/vnd.openxmlformats-officedocument.wordprocessingml.document"},
    { "dot", "application/msword"},
    { "dotm", "application/vnd.ms-word.template.macroenabled.12"},
    { "dotx", "application/vnd.openxmlformats-officedocument.wordprocessingml.template"},
    { "dp", "application/vnd.osgi.dp"},
    { "dpg", "application/vnd.dpgraph"},
    { "dsc", "text/prs.lines.tag"},
    { "dtb", "application/x-dtbook+xml"},
    { "dtd", "application/xml-dtd"},
    { "dts", "audio/vnd.dts"},
    { "dtshd", "audio/vnd.dts.hd"},
    { "dump", "application/octet-stream"},
    { "dvi", "application/x-dvi"},
    { "dwf", "model/vnd.dwf"},
    { "dwg", "image/vnd.dwg"},
    { "dxf", "image/vnd.dxf"},
    { "dxp", "application/vnd.spotfire.dxp"},
    { "dxr", "application/x-director"},
    { "ecelp4800", "audio/vnd.nuera.ecelp4800"},
    { "ecelp7470", "audio/vnd.nuera.ecelp7470"},
    { "ecelp9600", "audio/vnd.nuera.ecelp9600"},
    { "ecma", "application/ecmascript"},
    { "edm", "application/vnd.novadigm.edm"},
    { "edx", "application/vnd.novadigm.edx"},
    { "efif", "application/vnd.picsel"},
    { "ei6", "application/vnd.pg.osasli"},
    { "elc", "application/octet-stream"},
    { "eml", "message/rfc822"},
    { "emma", "application/emma+xml"},
    { "eol", "audio/vnd.digital-winds"},
    { "eot", "application/vnd.ms-fontobject"},
    { "eps", "application/postscript"},
    { "epub", "application/epub+zip"},
    { "es3", "application/vnd.eszigno3+xml"},
    { "esf", "application/vnd.epson.esf"},
    { "et3", "application/vnd.eszigno3+xml"},
    { "etx", "text/x-setext"},
    { "evy", "application/envoy"},
    { "exe", "application/octet-stream"},
    { "ext", "application/vnd.novadigm.ext"},
    { "ez2", "application/vnd.ezpix-album"},
    { "ez3", "application/vnd.ezpix-package"},
    { "ez", "application/andrew-inset"},
    { "f4v", "video/x-f4v"},
    { "f77", "text/x-fortran"},
    { "f90", "text/x-fortran"},
    { "fbs", "image/vnd.fastbidsheet"},
    { "fdf", "application/vnd.fdf"},
    { "fe_launch", "application/vnd.denovo.fcselayout-link"},
    { "fg5", "application/vnd.fujitsu.oasysgp"},
    { "fgd", "application/x-director"},
    { "fh4", "image/x-freehand"},
    { "fh5", "image/x-freehand"},
    { "fh7", "image/x-freehand"},
    { "fhc", "image/x-freehand"},
    { "fh", "image/x-freehand"},
    { "fif", "application/fractals"},
    { "fig", "application/x-xfig"},
    { "fli", "video/x-fli"},
    { "flo", "application/vnd.micrografx.flo"},
    { "flr", "x-world/x-vrml"},
    { "flv", "video/x-flv"},
    { "flw", "application/vnd.kde.kivio"},
    { "flx", "text/vnd.fmi.flexstor"},
    { "fly", "text/vnd.fly"},
    { "fm", "application/vnd.framemaker"},
    { "fnc", "application/vnd.frogans.fnc"},
    { "for", "text/x-fortran"},
    { "fpx", "image/vnd.fpx"},
    { "frame", "application/vnd.framemaker"},
    { "fsc", "application/vnd.fsc.weblaunch"},
    { "fst", "image/vnd.fst"},
    { "ftc", "application/vnd.fluxtime.clip"},
    { "f", "text/x-fortran"},
    { "fti", "application/vnd.anser-web-funds-transfer-initiation"},
    { "fvt", "video/vnd.fvt"},
    { "fzs", "application/vnd.fuzzysheet"},
    { "g3", "image/g3fax"},
    { "gac", "application/vnd.groove-account"},
    { "gdl", "model/vnd.gdl"},
    { "geo", "application/vnd.dynageo"},
    { "gex", "application/vnd.geometry-explorer"},
    { "ggb", "application/vnd.geogebra.file"},
    { "ggt", "application/vnd.geogebra.tool"},
    { "ghf", "application/vnd.groove-help"},
    { "gif", "image/gif"},
    { "gim", "application/vnd.groove-identity-message"},
    { "gmx", "application/vnd.gmx"},
    { "gnumeric", "application/x-gnumeric"},
    { "gph", "application/vnd.flographit"},
    { "gqf", "application/vnd.grafeq"},
    { "gqs", "application/vnd.grafeq"},
    { "gram", "application/srgs"},
    { "gre", "application/vnd.geometry-explorer"},
    { "grv", "application/vnd.groove-injector"},
    { "grxml", "application/srgs+xml"},
    { "gsf", "application/x-font-ghostscript"},
    { "gtar", "application/x-gtar"},
    { "gtm", "application/vnd.groove-tool-message"},
    { "gtw", "model/vnd.gtw"},
    { "gv", "text/vnd.graphviz"},
    { "gz", "application/x-gzip"},
    { "h261", "video/h261"},
    { "h263", "video/h263"},
    { "h264", "video/h264"},
    { "hbci", "application/vnd.hbci"},
    { "hdf", "application/x-hdf"},
    { "hh", "text/x-c"},
    { "hlp", "application/winhlp"},
    { "hpgl", "application/vnd.hp-hpgl"},
    { "hpid", "application/vnd.hp-hpid"},
    { "hps", "application/vnd.hp-hps"},
    { "hqx", "application/mac-binhex40"},
    { "hta", "application/hta"},
    { "htc", "text/x-component"},
    { "h", "text/plain"},
    { "htke", "application/vnd.kenameaapp"},
    { "html", "text/html"},
    { "htm", "text/html"},
    { "htt", "text/webviewhtml"},
    { "hvd", "application/vnd.yamaha.hv-dic"},
    { "hvp", "application/vnd.yamaha.hv-voice"},
    { "hvs", "application/vnd.yamaha.hv-script"},
    { "icc", "application/vnd.iccprofile"},
    { "ice", "x-conference/x-cooltalk"},
    { "icm", "application/vnd.iccprofile"},
    { "ico", "image/x-icon"},
    { "ics", "text/calendar"},
    { "ief", "image/ief"},
    { "ifb", "text/calendar"},
    { "ifm", "application/vnd.shana.informed.formdata"},
    { "iges", "model/iges"},
    { "igl", "application/vnd.igloader"},
    { "igs", "model/iges"},
    { "igx", "application/vnd.micrografx.igx"},
    { "iif", "application/vnd.shana.informed.interchange"},
    { "iii", "application/x-iphone"},
    { "imp", "application/vnd.accpac.simply.imp"},
    { "ims", "application/vnd.ms-ims"},
    { "ins", "application/x-internet-signup"},
    { "in", "text/plain"},
    { "ipk", "application/vnd.shana.informed.package"},
    { "irm", "application/vnd.ibm.rights-management"},
    { "irp", "application/vnd.irepository.package+xml"},
    { "iso", "application/octet-stream"},
    { "isp", "application/x-internet-signup"},
    { "itp", "application/vnd.shana.informed.formtemplate"},
    { "ivp", "application/vnd.immervision-ivp"},
    { "ivu", "application/vnd.immervision-ivu"},
    { "jad", "text/vnd.sun.j2me.app-descriptor"},
    { "jam", "application/vnd.jam"},
    { "jar", "application/java-archive"},
    { "java", "text/x-java-source"},
    { "jfif", "image/pipeg"},
    { "jisp", "application/vnd.jisp"},
    { "jlt", "application/vnd.hp-jlyt"},
    { "jnlp", "application/x-java-jnlp-file"},
    { "joda", "application/vnd.joost.joda-archive"},
    { "jpeg", "image/jpeg"},
    { "jpe", "image/jpeg"},
    { "jpg", "image/jpeg"},
    { "jpgm", "video/jpm"},
    { "jpgv", "video/jpeg"},
    { "jpm", "video/jpm"},
    { "js", "application/x-javascript"},
    { "json", "application/json"},
    { "kar", "audio/midi"},
    { "karbon", "application/vnd.kde.karbon"},
    { "kfo", "application/vnd.kde.kformula"},
    { "kia", "application/vnd.kidspiration"},
    { "kil", "application/x-killustrator"},
    { "kml", "application/vnd.google-earth.kml+xml"},
    { "kmz", "application/vnd.google-earth.kmz"},
    { "kne", "application/vnd.kinar"},
    { "knp", "application/vnd.kinar"},
    { "kon", "application/vnd.kde.kontour"},
    { "kpr", "application/vnd.kde.kpresenter"},
    { "kpt", "application/vnd.kde.kpresenter"},
    { "ksh", "text/plain"},
    { "ksp", "application/vnd.kde.kspread"},
    { "ktr", "application/vnd.kahootz"},
    { "ktz", "application/vnd.kahootz"},
    { "kwd", "application/vnd.kde.kword"},
    { "kwt", "application/vnd.kde.kword"},
    { "latex", "application/x-latex"},
    { "lbd", "application/vnd.llamagraphics.life-balance.desktop"},
    { "lbe", "application/vnd.llamagraphics.life-balance.exchange+xml"},
    { "les", "application/vnd.hhe.lesson-player"},
    { "lha", "application/octet-stream"},
    { "link66", "application/vnd.route66.link66+xml"},
    { "list3820", "application/vnd.ibm.modcap"},
    { "listafp", "application/vnd.ibm.modcap"},
    { "list", "text/plain"},
    { "log", "text/plain"},
    { "lostxml", "application/lost+xml"},
    { "lrf", "application/octet-stream"},
    { "lrm", "application/vnd.ms-lrm"},
    { "lsf", "video/x-la-asf"},
    { "lsx", "video/x-la-asf"},
    { "ltf", "application/vnd.frogans.ltf"},
    { "lvp", "audio/vnd.lucent.voice"},
    { "lwp", "application/vnd.lotus-wordpro"},
    { "lzh", "application/octet-stream"},
    { "m13", "application/x-msmediaview"},
    { "m14", "application/x-msmediaview"},
    { "m1v", "video/mpeg"},
    { "m2a", "audio/mpeg"},
    { "m2v", "video/mpeg"},
    { "m3a", "audio/mpeg"},
    { "m3u", "audio/x-mpegurl"},
    { "m4u", "video/vnd.mpegurl"},
    { "m4v", "video/x-m4v"},
    { "ma", "application/mathematica"},
    { "mag", "application/vnd.ecowin.chart"},
    { "maker", "application/vnd.framemaker"},
    { "man", "text/troff"},
    { "mathml", "application/mathml+xml"},
    { "mb", "application/mathematica"},
    { "mbk", "application/vnd.mobius.mbk"},
    { "mbox", "application/mbox"},
    { "mc1", "application/vnd.medcalcdata"},
    { "mcd", "application/vnd.mcd"},
    { "mcurl", "text/vnd.curl.mcurl"},
    { "mdb", "application/x-msaccess"},
    { "mdi", "image/vnd.ms-modi"},
    { "mesh", "model/mesh"},
    { "me", "text/troff"},
    { "mfm", "application/vnd.mfmp"},
    { "mgz", "application/vnd.proteus.magazine"},
    { "mht", "message/rfc822"},
    { "mhtml", "message/rfc822"},
    { "mid", "audio/midi"},
    { "midi", "audio/midi"},
    { "mif", "application/vnd.mif"},
    { "mime", "message/rfc822"},
    { "mj2", "video/mj2"},
    { "mjp2", "video/mj2"},
    { "mlp", "application/vnd.dolby.mlp"},
    { "mmd", "application/vnd.chipnuts.karaoke-mmd"},
    { "mmf", "application/vnd.smaf"},
    { "mmr", "image/vnd.fujixerox.edmics-mmr"},
    { "mny", "application/x-msmoney"},
    { "mobi", "application/x-mobipocket-ebook"},
    { "movie", "video/x-sgi-movie"},
    { "mov", "video/quicktime"},
    { "mp2a", "audio/mpeg"},
    { "mp2", "video/mpeg"},
    { "mp3", "audio/mpeg"},
    { "mp4a", "audio/mp4"},
    { "mp4s", "application/mp4"},
    { "mp4", "video/mp4"},
    { "mp4v", "video/mp4"},
    { "mpa", "video/mpeg"},
    { "mpc", "application/vnd.mophun.certificate"},
    { "mpeg", "video/mpeg"},
    { "mpe", "video/mpeg"},
    { "mpg4", "video/mp4"},
    { "mpga", "audio/mpeg"},
    { "mpg", "video/mpeg"},
    { "mpkg", "application/vnd.apple.installer+xml"},
    { "mpm", "application/vnd.blueice.multipass"},
    { "mpn", "application/vnd.mophun.application"},
    { "mpp", "application/vnd.ms-project"},
    { "mpt", "application/vnd.ms-project"},
    { "mpv2", "video/mpeg"},
    { "mpy", "application/vnd.ibm.minipay"},
    { "mqy", "application/vnd.mobius.mqy"},
    { "mrc", "application/marc"},
    { "mscml", "application/mediaservercontrol+xml"},
    { "mseed", "application/vnd.fdsn.mseed"},
    { "mseq", "application/vnd.mseq"},
    { "msf", "application/vnd.epson.msf"},
    { "msh", "model/mesh"},
    { "msi", "application/x-msdownload"},
    { "ms", "text/troff"},
    { "msty", "application/vnd.muvee.style"},
    { "mts", "model/vnd.mts"},
    { "mus", "application/vnd.musician"},
    { "musicxml", "application/vnd.recordare.musicxml+xml"},
    { "mvb", "application/x-msmediaview"},
    { "mxf", "application/mxf"},
    { "mxl", "application/vnd.recordare.musicxml"},
    { "mxml", "application/xv+xml"},
    { "mxs", "application/vnd.triscape.mxs"},
    { "mxu", "video/vnd.mpegurl"},
    { "nb", "application/mathematica"},
    { "nc", "application/x-netcdf"},
    { "ncx", "application/x-dtbncx+xml"},
    { "n-gage", "application/vnd.nokia.n-gage.symbian.install"},
    { "ngdat", "application/vnd.nokia.n-gage.data"},
    { "nlu", "application/vnd.neurolanguage.nlu"},
    { "nml", "application/vnd.enliven"},
    { "nnd", "application/vnd.noblenet-directory"},
    { "nns", "application/vnd.noblenet-sealer"},
    { "nnw", "application/vnd.noblenet-web"},
    { "npx", "image/vnd.net-fpx"},
    { "nsf", "application/vnd.lotus-notes"},
    { "nws", "message/rfc822"},
    { "oa2", "application/vnd.fujitsu.oasys2"},
    { "oa3", "application/vnd.fujitsu.oasys3"},
    { "o", "application/octet-stream"},
    { "oas", "application/vnd.fujitsu.oasys"},
    { "obd", "application/x-msbinder"},
    { "obj", "application/octet-stream"},
    { "oda", "application/oda"},
    { "odb", "application/vnd.oasis.opendocument.database"},
    { "odc", "application/vnd.oasis.opendocument.chart"},
    { "odf", "application/vnd.oasis.opendocument.formula"},
    { "odft", "application/vnd.oasis.opendocument.formula-template"},
    { "odg", "application/vnd.oasis.opendocument.graphics"},
    { "odi", "application/vnd.oasis.opendocument.image"},
    { "odp", "application/vnd.oasis.opendocument.presentation"},
    { "ods", "application/vnd.oasis.opendocument.spreadsheet"},
    { "odt", "application/vnd.oasis.opendocument.text"},
    { "oga", "audio/ogg"},
    { "ogg", "audio/ogg"},
    { "ogv", "video/ogg"},
    { "ogx", "application/ogg"},
    { "onepkg", "application/onenote"},
    { "onetmp", "application/onenote"},
    { "onetoc2", "application/onenote"},
    { "onetoc", "application/onenote"},
    { "opf", "application/oebps-package+xml"},
    { "oprc", "application/vnd.palm"},
    { "org", "application/vnd.lotus-organizer"},
    { "osf", "application/vnd.yamaha.openscoreformat"},
    { "osfpvg", "application/vnd.yamaha.openscoreformat.osfpvg+xml"},
    { "otc", "application/vnd.oasis.opendocument.chart-template"},
    { "otf", "application/x-font-otf"},
    { "otg", "application/vnd.oasis.opendocument.graphics-template"},
    { "oth", "application/vnd.oasis.opendocument.text-web"},
    { "oti", "application/vnd.oasis.opendocument.image-template"},
    { "otm", "application/vnd.oasis.opendocument.text-master"},
    { "otp", "application/vnd.oasis.opendocument.presentation-template"},
    { "ots", "application/vnd.oasis.opendocument.spreadsheet-template"},
    { "ott", "application/vnd.oasis.opendocument.text-template"},
    { "oxt", "application/vnd.openofficeorg.extension"},
    { "p10", "application/pkcs10"},
    { "p12", "application/x-pkcs12"},
    { "p7b", "application/x-pkcs7-certificates"},
    { "p7c", "application/x-pkcs7-mime"},
    { "p7m", "application/x-pkcs7-mime"},
    { "p7r", "application/x-pkcs7-certreqresp"},
    { "p7s", "application/x-pkcs7-signature"},
    { "pas", "text/x-pascal"},
    { "pbd", "application/vnd.powerbuilder6"},
    { "pbm", "image/x-portable-bitmap"},
    { "pcf", "application/x-font-pcf"},
    { "pcl", "application/vnd.hp-pcl"},
    { "pclxl", "application/vnd.hp-pclxl"},
    { "pct", "image/x-pict"},
    { "pcurl", "application/vnd.curl.pcurl"},
    { "pcx", "image/x-pcx"},
    { "pdb", "application/vnd.palm"},
    { "pdf", "application/pdf"},
    { "pfa", "application/x-font-type1"},
    { "pfb", "application/x-font-type1"},
    { "pfm", "application/x-font-type1"},
    { "pfr", "application/font-tdpfr"},
    { "pfx", "application/x-pkcs12"},
    { "pgm", "image/x-portable-graymap"},
    { "pgn", "application/x-chess-pgn"},
    { "pgp", "application/pgp-encrypted"},
    { "pic", "image/x-pict"},
    { "pkg", "application/octet-stream"},
    { "pki", "application/pkixcmp"},
    { "pkipath", "application/pkix-pkipath"},
    { "pko", "application/ynd.ms-pkipko"},
    { "plb", "application/vnd.3gpp.pic-bw-large"},
    { "plc", "application/vnd.mobius.plc"},
    { "plf", "application/vnd.pocketlearn"},
    { "pls", "application/pls+xml"},
    { "pl", "text/plain"},
    { "pma", "application/x-perfmon"},
    { "pmc", "application/x-perfmon"},
    { "pml", "application/x-perfmon"},
    { "pmr", "application/x-perfmon"},
    { "pmw", "application/x-perfmon"},
    { "png", "image/png"},
    { "pnm", "image/x-portable-anymap"},
    { "portpkg", "application/vnd.macports.portpkg"},
    { "pot,", "application/vnd.ms-powerpoint"},
    { "pot", "application/vnd.ms-powerpoint"},
    { "potm", "application/vnd.ms-powerpoint.template.macroenabled.12"},
    { "potx", "application/vnd.openxmlformats-officedocument.presentationml.template"},
    { "ppa", "application/vnd.ms-powerpoint"},
    { "ppam", "application/vnd.ms-powerpoint.addin.macroenabled.12"},
    { "ppd", "application/vnd.cups-ppd"},
    { "ppm", "image/x-portable-pixmap"},
    { "pps", "application/vnd.ms-powerpoint"},
    { "ppsm", "application/vnd.ms-powerpoint.slideshow.macroenabled.12"},
    { "ppsx", "application/vnd.openxmlformats-officedocument.presentationml.slideshow"},
    { "ppt", "application/vnd.ms-powerpoint"},
    { "pptm", "application/vnd.ms-powerpoint.presentation.macroenabled.12"},
    { "pptx", "application/vnd.openxmlformats-officedocument.presentationml.presentation"},
    { "pqa", "application/vnd.palm"},
    { "prc", "application/x-mobipocket-ebook"},
    { "pre", "application/vnd.lotus-freelance"},
    { "prf", "application/pics-rules"},
    { "ps", "application/postscript"},
    { "psb", "application/vnd.3gpp.pic-bw-small"},
    { "psd", "image/vnd.adobe.photoshop"},
    { "psf", "application/x-font-linux-psf"},
    { "p", "text/x-pascal"},
    { "ptid", "application/vnd.pvi.ptid1"},
    { "pub", "application/x-mspublisher"},
    { "pvb", "application/vnd.3gpp.pic-bw-var"},
    { "pwn", "application/vnd.3m.post-it-notes"},
    { "pwz", "application/vnd.ms-powerpoint"},
    { "pya", "audio/vnd.ms-playready.media.pya"},
    { "pyc", "application/x-python-code"},
    { "pyo", "application/x-python-code"},
    { "py", "text/x-python"},
    { "pyv", "video/vnd.ms-playready.media.pyv"},
    { "qam", "application/vnd.epson.quickanime"},
    { "qbo", "application/vnd.intu.qbo"},
    { "qfx", "application/vnd.intu.qfx"},
    { "qps", "application/vnd.publishare-delta-tree"},
    { "qt", "video/quicktime"},
    { "qwd", "application/vnd.quark.quarkxpress"},
    { "qwt", "application/vnd.quark.quarkxpress"},
    { "qxb", "application/vnd.quark.quarkxpress"},
    { "qxd", "application/vnd.quark.quarkxpress"},
    { "qxl", "application/vnd.quark.quarkxpress"},
    { "qxt", "application/vnd.quark.quarkxpress"},
    { "ra", "audio/x-pn-realaudio"},
    { "ram", "audio/x-pn-realaudio"},
    { "rar", "application/x-rar-compressed"},
    { "ras", "image/x-cmu-raster"},
    { "rcprofile", "application/vnd.ipunplugged.rcprofile"},
    { "rdf", "application/rdf+xml"},
    { "rdz", "application/vnd.data-vision.rdz"},
    { "rep", "application/vnd.businessobjects"},
    { "res", "application/x-dtbresource+xml"},
    { "rgb", "image/x-rgb"},
    { "rif", "application/reginfo+xml"},
    { "rl", "application/resource-lists+xml"},
    { "rlc", "image/vnd.fujixerox.edmics-rlc"},
    { "rld", "application/resource-lists-diff+xml"},
    { "rm", "application/vnd.rn-realmedia"},
    { "rmi", "audio/midi"},
    { "rmp", "audio/x-pn-realaudio-plugin"},
    { "rms", "application/vnd.jcp.javame.midlet-rms"},
    { "rnc", "application/relax-ng-compact-syntax"},
    { "roff", "text/troff"},
    { "rpm", "application/x-rpm"},
    { "rpss", "application/vnd.nokia.radio-presets"},
    { "rpst", "application/vnd.nokia.radio-preset"},
    { "rq", "application/sparql-query"},
    { "rs", "application/rls-services+xml"},
    { "rsd", "application/rsd+xml"},
    { "rss", "application/rss+xml"},
    { "rtf", "application/rtf"},
    { "rtx", "text/richtext"},
    { "saf", "application/vnd.yamaha.smaf-audio"},
    { "sbml", "application/sbml+xml"},
    { "sc", "application/vnd.ibm.secure-container"},
    { "scd", "application/x-msschedule"},
    { "scm", "application/vnd.lotus-screencam"},
    { "scq", "application/scvp-cv-request"},
    { "scs", "application/scvp-cv-response"},
    { "sct", "text/scriptlet"},
    { "scurl", "text/vnd.curl.scurl"},
    { "sda", "application/vnd.stardivision.draw"},
    { "sdc", "application/vnd.stardivision.calc"},
    { "sdd", "application/vnd.stardivision.impress"},
    { "sdkd", "application/vnd.solent.sdkm+xml"},
    { "sdkm", "application/vnd.solent.sdkm+xml"},
    { "sdp", "application/sdp"},
    { "sdw", "application/vnd.stardivision.writer"},
    { "see", "application/vnd.seemail"},
    { "seed", "application/vnd.fdsn.seed"},
    { "sema", "application/vnd.sema"},
    { "semd", "application/vnd.semd"},
    { "semf", "application/vnd.semf"},
    { "ser", "application/java-serialized-object"},
    { "setpay", "application/set-payment-initiation"},
    { "setreg", "application/set-registration-initiation"},
    { "sfd-hdstx", "application/vnd.hydrostatix.sof-data"},
    { "sfs", "application/vnd.spotfire.sfs"},
    { "sgl", "application/vnd.stardivision.writer-global"},
    { "sgml", "text/sgml"},
    { "sgm", "text/sgml"},
    { "sh", "application/x-sh"},
    { "shar", "application/x-shar"},
    { "shf", "application/shf+xml"},
    { "sic", "application/vnd.wap.sic"},
    { "sig", "application/pgp-signature"},
    { "silo", "model/mesh"},
    { "sis", "application/vnd.symbian.install"},
    { "sisx", "application/vnd.symbian.install"},
    { "sit", "application/x-stuffit"},
    { "si", "text/vnd.wap.si"},
    { "sitx", "application/x-stuffitx"},
    { "skd", "application/vnd.koan"},
    { "skm", "application/vnd.koan"},
    { "skp", "application/vnd.koan"},
    { "skt", "application/vnd.koan"},
    { "slc", "application/vnd.wap.slc"},
    { "sldm", "application/vnd.ms-powerpoint.slide.macroenabled.12"},
    { "sldx", "application/vnd.openxmlformats-officedocument.presentationml.slide"},
    { "slt", "application/vnd.epson.salt"},
    { "sl", "text/vnd.wap.sl"},
    { "smf", "application/vnd.stardivision.math"},
    { "smi", "application/smil+xml"},
    { "smil", "application/smil+xml"},
    { "snd", "audio/basic"},
    { "snf", "application/x-font-snf"},
    { "so", "application/octet-stream"},
    { "spc", "application/x-pkcs7-certificates"},
    { "spf", "application/vnd.yamaha.smaf-phrase"},
    { "spl", "application/x-futuresplash"},
    { "spot", "text/vnd.in3d.spot"},
    { "spp", "application/scvp-vp-response"},
    { "spq", "application/scvp-vp-request"},
    { "spx", "audio/ogg"},
    { "src", "application/x-wais-source"},
    { "srx", "application/sparql-results+xml"},
    { "sse", "application/vnd.kodak-descriptor"},
    { "ssf", "application/vnd.epson.ssf"},
    { "ssml", "application/ssml+xml"},
    { "sst", "application/vnd.ms-pkicertstore"},
    { "stc", "application/vnd.sun.xml.calc.template"},
    { "std", "application/vnd.sun.xml.draw.template"},
    { "s", "text/x-asm"},
    { "stf", "application/vnd.wt.stf"},
    { "sti", "application/vnd.sun.xml.impress.template"},
    { "stk", "application/hyperstudio"},
    { "stl", "application/vnd.ms-pki.stl"},
    { "stm", "text/html"},
    { "str", "application/vnd.pg.format"},
    { "stw", "application/vnd.sun.xml.writer.template"},
    { "sus", "application/vnd.sus-calendar"},
    { "susp", "application/vnd.sus-calendar"},
    { "sv4cpio", "application/x-sv4cpio"},
    { "sv4crc", "application/x-sv4crc"},
    { "svd", "application/vnd.svd"},
    { "svg", "image/svg+xml"},
    { "svgz", "image/svg+xml"},
    { "swa", "application/x-director"},
    { "swf", "application/x-shockwave-flash"},
    { "swi", "application/vnd.arastra.swi"},
    { "sxc", "application/vnd.sun.xml.calc"},
    { "sxd", "application/vnd.sun.xml.draw"},
    { "sxg", "application/vnd.sun.xml.writer.global"},
    { "sxi", "application/vnd.sun.xml.impress"},
    { "sxm", "application/vnd.sun.xml.math"},
    { "sxw", "application/vnd.sun.xml.writer"},
    { "tao", "application/vnd.tao.intent-module-archive"},
    { "t", "application/x-troff"},
    { "tar", "application/x-tar"},
    { "tcap", "application/vnd.3gpp2.tcap"},
    { "tcl", "application/x-tcl"},
    { "teacher", "application/vnd.smart.teacher"},
    { "tex", "application/x-tex"},
    { "texi", "application/x-texinfo"},
    { "texinfo", "application/x-texinfo"},
    { "text", "text/plain"},
    { "tfm", "application/x-tex-tfm"},
    { "tgz", "application/x-gzip"},
    { "tiff", "image/tiff"},
    { "tif", "image/tiff"},
    { "tmo", "application/vnd.tmobile-livetv"},
    { "torrent", "application/x-bittorrent"},
    { "tpl", "application/vnd.groove-tool-template"},
    { "tpt", "application/vnd.trid.tpt"},
    { "tra", "application/vnd.trueapp"},
    { "trm", "application/x-msterminal"},
    { "tr", "text/troff"},
    { "tsv", "text/tab-separated-values"},
    { "ttc", "application/x-font-ttf"},
    { "ttf", "application/x-font-ttf"},
    { "twd", "application/vnd.simtech-mindmapper"},
    { "twds", "application/vnd.simtech-mindmapper"},
    { "txd", "application/vnd.genomatix.tuxedo"},
    { "txf", "application/vnd.mobius.txf"},
    { "txt", "text/plain"},
    { "u32", "application/x-authorware-bin"},
    { "udeb", "application/x-debian-package"},
    { "ufd", "application/vnd.ufdl"},
    { "ufdl", "application/vnd.ufdl"},
    { "uls", "text/iuls"},
    { "umj", "application/vnd.umajin"},
    { "unityweb", "application/vnd.unity"},
    { "uoml", "application/vnd.uoml+xml"},
    { "uris", "text/uri-list"},
    { "uri", "text/uri-list"},
    { "urls", "text/uri-list"},
    { "ustar", "application/x-ustar"},
    { "utz", "application/vnd.uiq.theme"},
    { "uu", "text/x-uuencode"},
    { "vcd", "application/x-cdlink"},
    { "vcf", "text/x-vcard"},
    { "vcg", "application/vnd.groove-vcard"},
    { "vcs", "text/x-vcalendar"},
    { "vcx", "application/vnd.vcx"},
    { "vis", "application/vnd.visionary"},
    { "viv", "video/vnd.vivo"},
    { "vor", "application/vnd.stardivision.writer"},
    { "vox", "application/x-authorware-bin"},
    { "vrml", "x-world/x-vrml"},
    { "vsd", "application/vnd.visio"},
    { "vsf", "application/vnd.vsf"},
    { "vss", "application/vnd.visio"},
    { "vst", "application/vnd.visio"},
    { "vsw", "application/vnd.visio"},
    { "vtu", "model/vnd.vtu"},
    { "vxml", "application/voicexml+xml"},
    { "w3d", "application/x-director"},
    { "wad", "application/x-doom"},
    { "wav", "audio/x-wav"},
    { "wax", "audio/x-ms-wax"},
    { "wbmp", "image/vnd.wap.wbmp"},
    { "wbs", "application/vnd.criticaltools.wbs+xml"},
    { "wbxml", "application/vnd.wap.wbxml"},
    { "wcm", "application/vnd.ms-works"},
    { "wdb", "application/vnd.ms-works"},
    { "wiz", "application/msword"},
    { "wks", "application/vnd.ms-works"},
    { "wma", "audio/x-ms-wma"},
    { "wmd", "application/x-ms-wmd"},
    { "wmf", "application/x-msmetafile"},
    { "wmlc", "application/vnd.wap.wmlc"},
    { "wmlsc", "application/vnd.wap.wmlscriptc"},
    { "wmls", "text/vnd.wap.wmlscript"},
    { "wml", "text/vnd.wap.wml"},
    { "wm", "video/x-ms-wm"},
    { "wmv", "video/x-ms-wmv"},
    { "wmx", "video/x-ms-wmx"},
    { "wmz", "application/x-ms-wmz"},
    { "wpd", "application/vnd.wordperfect"},
    { "wpl", "application/vnd.ms-wpl"},
    { "wps", "application/vnd.ms-works"},
    { "wqd", "application/vnd.wqd"},
    { "wri", "application/x-mswrite"},
    { "wrl", "x-world/x-vrml"},
    { "wrz", "x-world/x-vrml"},
    { "wsdl", "application/wsdl+xml"},
    { "wspolicy", "application/wspolicy+xml"},
    { "wtb", "application/vnd.webturbo"},
    { "wvx", "video/x-ms-wvx"},
    { "x32", "application/x-authorware-bin"},
    { "x3d", "application/vnd.hzn-3d-crossword"},
    { "xaf", "x-world/x-vrml"},
    { "xap", "application/x-silverlight-app"},
    { "xar", "application/vnd.xara"},
    { "xbap", "application/x-ms-xbap"},
    { "xbd", "application/vnd.fujixerox.docuworks.binder"},
    { "xbm", "image/x-xbitmap"},
    { "xdm", "application/vnd.syncml.dm+xml"},
    { "xdp", "application/vnd.adobe.xdp+xml"},
    { "xdw", "application/vnd.fujixerox.docuworks"},
    { "xenc", "application/xenc+xml"},
    { "xer", "application/patch-ops-error+xml"},
    { "xfdf", "application/vnd.adobe.xfdf"},
    { "xfdl", "application/vnd.xfdl"},
    { "xht", "application/xhtml+xml"},
    { "xhtml", "application/xhtml+xml"},
    { "xhvml", "application/xv+xml"},
    { "xif", "image/vnd.xiff"},
    { "xla", "application/vnd.ms-excel"},
    { "xlam", "application/vnd.ms-excel.addin.macroenabled.12"},
    { "xlb", "application/vnd.ms-excel"},
    { "xlc", "application/vnd.ms-excel"},
    { "xlm", "application/vnd.ms-excel"},
    { "xls", "application/vnd.ms-excel"},
    { "xlsb", "application/vnd.ms-excel.sheet.binary.macroenabled.12"},
    { "xlsm", "application/vnd.ms-excel.sheet.macroenabled.12"},
    { "xlsx", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"},
    { "xlt", "application/vnd.ms-excel"},
    { "xltm", "application/vnd.ms-excel.template.macroenabled.12"},
    { "xltx", "application/vnd.openxmlformats-officedocument.spreadsheetml.template"},
    { "xlw", "application/vnd.ms-excel"},
    { "xml", "application/xml"},
    { "xo", "application/vnd.olpc-sugar"},
    { "xof", "x-world/x-vrml"},
    { "xop", "application/xop+xml"},
    { "xpdl", "application/xml"},
    { "xpi", "application/x-xpinstall"},
    { "xpm", "image/x-xpixmap"},
    { "xpr", "application/vnd.is-xpr"},
    { "xps", "application/vnd.ms-xpsdocument"},
    { "xpw", "application/vnd.intercon.formnet"},
    { "xpx", "application/vnd.intercon.formnet"},
    { "xsl", "application/xml"},
    { "xslt", "application/xslt+xml"},
    { "xsm", "application/vnd.syncml+xml"},
    { "xspf", "application/xspf+xml"},
    { "xul", "application/vnd.mozilla.xul+xml"},
    { "xvm", "application/xv+xml"},
    { "xvml", "application/xv+xml"},
    { "xwd", "image/x-xwindowdump"},
    { "xyz", "chemical/x-xyz"},
    { "z", "application/x-compress"},
    { "zaz", "application/vnd.zzazz.deck+xml"},
    { "zip", "application/zip"},
    { "zir", "application/vnd.zul"},
    { "zirz", "application/vnd.zul"},
    { "zmm", "application/vnd.handheld-entertainment+xml"}
    };


    public static String unfold(String s) {
        if (s == null) {
            return null;
        }
        return s.replaceAll("\r|\n", "");
    }

    private static String decode(String s, Message message) {
        if (s == null) {
            return null;
        } else {
            return DecoderUtil.decodeEncodedWords(s, message);
        }
    }

    public static String unfoldAndDecode(String s) {
        return unfoldAndDecode(s, null);
    }

    public static String unfoldAndDecode(String s, Message message) {
        return decode(unfold(s), message);
    }

    // TODO implement proper foldAndEncode
    public static String foldAndEncode(String s) {
        return s;
    }

    /**
     * Returns the named parameter of a header field. If name is null the first
     * parameter is returned, or if there are no additional parameters in the
     * field the entire field is returned. Otherwise the named parameter is
     * searched for in a case insensitive fashion and returned.
     *
     * @param headerValue the header value
     * @param parameterName the parameter name
     * @return the value. if the parameter cannot be found the method returns null.
     */
    public static String getHeaderParameter(String headerValue, String parameterName) {
        if (headerValue == null) {
            return null;
        }
        headerValue = headerValue.replaceAll("\r|\n", "");
        String[] parts = headerValue.split(";");
        if (parameterName == null && parts.length > 0) {
            return parts[0].trim();
        }
        for (String part : parts) {
            if (parameterName != null &&
                    part.trim().toLowerCase(Locale.US).startsWith(parameterName.toLowerCase(Locale.US))) {
                String[] partParts = part.split("=", 2);
                if (partParts.length == 2) {
                    String parameter = partParts[1].trim();
                    int len = parameter.length();
                    if (len >= 2 && parameter.startsWith("\"") && parameter.endsWith("\"")) {
                        return parameter.substring(1, len - 1);
                    } else {
                        return parameter;
                    }
                }
            }
        }
        return null;
    }

    public static Part findFirstPartByMimeType(Part part, String mimeType) throws MessagingException {
        if (part.getBody() instanceof Multipart) {
            Multipart multipart = (Multipart)part.getBody();
            for (BodyPart bodyPart : multipart.getBodyParts()) {
                Part ret = MimeUtility.findFirstPartByMimeType(bodyPart, mimeType);
                if (ret != null) {
                    return ret;
                }
            }
        } else if (part.getMimeType().equalsIgnoreCase(mimeType)) {
            return part;
        }
        return null;
    }

    /**
     * Returns true if the given mimeType matches the matchAgainst specification.
     * @param mimeType A MIME type to check.
     * @param matchAgainst A MIME type to check against. May include wildcards such as image/* or
     * * /*.
     * @return
     */
    public static boolean mimeTypeMatches(String mimeType, String matchAgainst) {
        Pattern p = Pattern.compile(matchAgainst.replaceAll("\\*", "\\.\\*"), Pattern.CASE_INSENSITIVE);
        return p.matcher(mimeType).matches();
    }

    public static boolean isDefaultMimeType(String mimeType) {
        return DEFAULT_ATTACHMENT_MIME_TYPE.equalsIgnoreCase(mimeType);
    }

    public static Body createBody(InputStream in, String contentTransferEncoding, String contentType)
            throws IOException, MessagingException {

        if (contentTransferEncoding != null) {
            contentTransferEncoding = MimeUtility.getHeaderParameter(contentTransferEncoding, null);
        }

        BinaryTempFileBody tempBody;
        if (MimeUtil.isMessage(contentType)) {
            tempBody = new BinaryTempFileMessageBody(contentTransferEncoding);
        } else {
            tempBody = new BinaryTempFileBody(contentTransferEncoding);
        }

        OutputStream out = tempBody.getOutputStream();
        try {
            IOUtils.copy(in, out);
        } finally {
            out.close();
        }

        return tempBody;
    }

    /**
     * Get decoded contents of a body.
     * <p/>
     * Right now only some classes retain the original encoding of the body contents. Those classes have to implement
     * the {@link RawDataBody} interface in order for this method to decode the data delivered by
     * {@link Body#getInputStream()}.
     * <p/>
     * The ultimate goal is to get to a point where all classes retain the original data and {@code RawDataBody} can be
     * merged into {@link Body}.
     */
    public static InputStream decodeBody(Body body) throws MessagingException {
        InputStream inputStream;
        if (body instanceof RawDataBody) {
            RawDataBody rawDataBody = (RawDataBody) body;
            String encoding = rawDataBody.getEncoding();
            final InputStream rawInputStream = rawDataBody.getInputStream();
            if (MimeUtil.ENC_7BIT.equalsIgnoreCase(encoding) || MimeUtil.ENC_8BIT.equalsIgnoreCase(encoding)) {
                inputStream = rawInputStream;
            } else if (MimeUtil.ENC_BASE64.equalsIgnoreCase(encoding)) {
                inputStream = new Base64InputStream(rawInputStream, false) {
                    @Override
                    public void close() throws IOException {
                        super.close();
                        rawInputStream.close();
                    }
                };
            } else if (MimeUtil.ENC_QUOTED_PRINTABLE.equalsIgnoreCase(encoding)) {
                inputStream = new QuotedPrintableInputStream(rawInputStream) {
                    @Override
                    public void close() throws IOException {
                        super.close();
                        rawInputStream.close();
                    }
                };
            } else {
                throw new RuntimeException("Encoding for RawDataBody not supported: " + encoding);
            }
        } else {
            inputStream = body.getInputStream();
        }

        return inputStream;
    }

    public static String getMimeTypeByExtension(String filename) {
        String returnedType = null;
        String extension = null;

        if (filename != null && filename.lastIndexOf('.') != -1) {
            extension = filename.substring(filename.lastIndexOf('.') + 1).toLowerCase(Locale.US);
            returnedType = android.webkit.MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension);
        }
        // If the MIME type set by the user's mailer is application/octet-stream, try to figure
        // out whether there's a sane file type extension.
        if (returnedType != null && !DEFAULT_ATTACHMENT_MIME_TYPE.equalsIgnoreCase(returnedType)) {
            return returnedType;
        } else if (extension != null) {
            for (String[] contentTypeMapEntry : MIME_TYPE_BY_EXTENSION_MAP) {
                if (contentTypeMapEntry[0].equals(extension)) {
                    return contentTypeMapEntry[1];
                }
            }
        }

        return DEFAULT_ATTACHMENT_MIME_TYPE;
    }

    public static String getExtensionByMimeType(String mimeType) {
        String lowerCaseMimeType = mimeType.toLowerCase(Locale.US);
        for (String[] contentTypeMapEntry : MIME_TYPE_BY_EXTENSION_MAP) {
            if (contentTypeMapEntry[1].equals(lowerCaseMimeType)) {
                return contentTypeMapEntry[0];
            }
        }

        return null;
    }

    /**
     * Get a default content-transfer-encoding for use with a given content-type
     * when adding an unencoded attachment. It's possible that 8bit encodings
     * may later be converted to 7bit for 7bit transport.
     * <ul>
     * <li>null: base64
     * <li>message/rfc822: 8bit
     * <li>message/*: 7bit
     * <li>multipart/signed: 7bit
     * <li>multipart/*: 8bit
     * <li>*&#47;*: base64
     * </ul>
     *
     * @param type
     *            A String representing a MIME content-type
     * @return A String representing a MIME content-transfer-encoding
     */
    public static String getEncodingforType(String type) {
        if (type == null) {
            return (MimeUtil.ENC_BASE64);
        } else if (MimeUtil.isMessage(type)) {
            return (MimeUtil.ENC_8BIT);
        } else if ("multipart/signed".equalsIgnoreCase(type) || type.toLowerCase(Locale.US).startsWith("message/")) {
            return (MimeUtil.ENC_7BIT);
        } else if (type.toLowerCase(Locale.US).startsWith("multipart/")) {
            return (MimeUtil.ENC_8BIT);
        } else {
            return (MimeUtil.ENC_BASE64);
        }
    }
}