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const (
	ZstdMagicSkippableStart = 0x184D2A50
	ZstdMagicSkippableMask  = 0xFFFFFFF0
)

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const (
	TYPE_DOC docType = iota
	TYPE_DOCX
	TYPE_XLS
	TYPE_XLSX
	TYPE_PPT
	TYPE_PPTX
	TYPE_OOXML
)

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var (
	TypeWasm = newType("wasm", "application/wasm")
	TypeDex  = newType("dex", "application/vnd.android.dex")
	TypeDey  = newType("dey", "application/vnd.android.dey")
)

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var (
	TypeEpub   = newType("epub", "application/epub+zip")
	TypeZip    = newType("zip", "application/zip")
	TypeTar    = newType("tar", "application/x-tar")
	TypeRar    = newType("rar", "application/vnd.rar")
	TypeGz     = newType("gz", "application/gzip")
	TypeBz2    = newType("bz2", "application/x-bzip2")
	Type7z     = newType("7z", "application/x-7z-compressed")
	TypeXz     = newType("xz", "application/x-xz")
	TypeZstd   = newType("zst", "application/zstd")
	TypePdf    = newType("pdf", "application/pdf")
	TypeExe    = newType("exe", "application/vnd.microsoft.portable-executable")
	TypeSwf    = newType("swf", "application/x-shockwave-flash")
	TypeRtf    = newType("rtf", "application/rtf")
	TypeEot    = newType("eot", "application/octet-stream")
	TypePs     = newType("ps", "application/postscript")
	TypeSqlite = newType("sqlite", "application/vnd.sqlite3")
	TypeNes    = newType("nes", "application/x-nintendo-nes-rom")
	TypeCrx    = newType("crx", "application/x-google-chrome-extension")
	TypeCab    = newType("cab", "application/vnd.ms-cab-compressed")
	TypeDeb    = newType("deb", "application/vnd.debian.binary-package")
	TypeAr     = newType("ar", "application/x-unix-archive")
	TypeZ      = newType("Z", "application/x-compress")
	TypeLz     = newType("lz", "application/x-lzip")
	TypeRpm    = newType("rpm", "application/x-rpm")
	TypeElf    = newType("elf", "application/x-executable")
	TypeDcm    = newType("dcm", "application/dicom")
	TypeIso    = newType("iso", "application/x-iso9660-image")
	TypeMachO  = newType("macho", "application/x-mach-binary") 
)

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var (
	TypeMidi = newType("mid", "audio/midi")
	TypeMp3  = newType("mp3", "audio/mpeg")
	TypeM4a  = newType("m4a", "audio/m4a")
	TypeOgg  = newType("ogg", "audio/ogg")
	TypeFlac = newType("flac", "audio/x-flac")
	TypeWav  = newType("wav", "audio/x-wav")
	TypeAmr  = newType("amr", "audio/amr")
	TypeAac  = newType("aac", "audio/aac")
	TypeAiff = newType("aiff", "audio/x-aiff")
)

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var (
	TypeDoc  = newType("doc", "application/msword")
	TypeDocx = newType("docx", "application/vnd.openxmlformats-officedocument.wordprocessingml.document")
	TypeXls  = newType("xls", "application/vnd.ms-excel")
	TypeXlsx = newType("xlsx", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet")
	TypePpt  = newType("ppt", "application/vnd.ms-powerpoint")
	TypePptx = newType("pptx", "application/vnd.openxmlformats-officedocument.presentationml.presentation")
)

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var (
	TypeWoff  = newType("woff", "application/font-woff")
	TypeWoff2 = newType("woff2", "application/font-woff")
	TypeTtf   = newType("ttf", "application/font-sfnt")
	TypeOtf   = newType("otf", "application/font-sfnt")
)

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var (
	TypeJpeg     = newType("jpg", "image/jpeg")
	TypeJpeg2000 = newType("jp2", "image/jp2")
	TypePng      = newType("png", "image/png")
	TypeGif      = newType("gif", "image/gif")
	TypeWebp     = newType("webp", "image/webp")
	TypeCR2      = newType("cr2", "image/x-canon-cr2")
	TypeTiff     = newType("tif", "image/tiff")
	TypeBmp      = newType("bmp", "image/bmp")
	TypeJxr      = newType("jxr", "image/vnd.ms-photo")
	TypePsd      = newType("psd", "image/vnd.adobe.photoshop")
	TypeIco      = newType("ico", "image/vnd.microsoft.icon")
	TypeHeif     = newType("heif", "image/heif")
	TypeDwg      = newType("dwg", "image/vnd.dwg")
)

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var (
	TypeMp4  = newType("mp4", "video/mp4")
	TypeM4v  = newType("m4v", "video/x-m4v")
	TypeMkv  = newType("mkv", "video/x-matroska")
	TypeWebm = newType("webm", "video/webm")
	TypeMov  = newType("mov", "video/quicktime")
	TypeAvi  = newType("avi", "video/x-msvideo")
	TypeWmv  = newType("wmv", "video/x-ms-wmv")
	TypeMpeg = newType("mpg", "video/mpeg")
	TypeFlv  = newType("flv", "video/x-flv")
	Type3gp  = newType("3gp", "video/3gpp")
)

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var Archive = Map{
	TypeEpub:   bytePrefixMatcher(epubMagic),
	TypeZip:    Zip,
	TypeTar:    Tar,
	TypeRar:    Rar,
	TypeGz:     bytePrefixMatcher(gzMagic),
	TypeBz2:    bytePrefixMatcher(bz2Magic),
	Type7z:     bytePrefixMatcher(sevenzMagic),
	TypeXz:     bytePrefixMatcher(xzMagic),
	TypeZstd:   Zst,
	TypePdf:    bytePrefixMatcher(pdfMagic),
	TypeExe:    bytePrefixMatcher(exeMagic),
	TypeSwf:    Swf,
	TypeRtf:    bytePrefixMatcher(rtfMagic),
	TypeEot:    Eot,
	TypePs:     bytePrefixMatcher(psMagic),
	TypeSqlite: bytePrefixMatcher(sqliteMagic),
	TypeNes:    bytePrefixMatcher(nesMagic),
	TypeCrx:    bytePrefixMatcher(crxMagic),
	TypeCab:    Cab,
	TypeDeb:    bytePrefixMatcher(debMagic),
	TypeAr:     bytePrefixMatcher(arMagic),
	TypeZ:      Z,
	TypeLz:     bytePrefixMatcher(lzMagic),
	TypeRpm:    Rpm,
	TypeElf:    Elf,
	TypeDcm:    Dcm,
	TypeIso:    Iso,
	TypeMachO:  MachO,
}

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var Image = Map{
	TypeJpeg:     Jpeg,
	TypeJpeg2000: Jpeg2000,
	TypePng:      Png,
	TypeGif:      Gif,
	TypeWebp:     Webp,
	TypeCR2:      CR2,
	TypeTiff:     Tiff,
	TypeBmp:      Bmp,
	TypeJxr:      Jxr,
	TypePsd:      Psd,
	TypeIco:      Ico,
	TypeHeif:     Heif,
	TypeDwg:      Dwg,
}

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var Video = Map{
	TypeMp4:  Mp4,
	TypeM4v:  M4v,
	TypeMkv:  Mkv,
	TypeWebm: Webm,
	TypeMov:  Mov,
	TypeAvi:  Avi,
	TypeWmv:  Wmv,
	TypeMpeg: Mpeg,
	TypeFlv:  Flv,
	Type3gp:  Match3gp,
}

Dex detects dalvik executable(DEX)

Dey Optimized Dalvik Executable(ODEX)

Wasm detects a Web Assembly 1.0 filetype.

Type interface to store pairs of type with its matcher function

Matcher function interface as type alias

Type specific matcher function interface