bufr: add support (#754)

Author: gabriel-vasile

internal/magic/meteo.go

@@ -10,3 +10,11 @@ func GRIB(raw []byte, _ uint32) bool {
 		bytes.HasPrefix(raw, []byte("GRIB")) &&
 		(raw[7] == 1 || raw[7] == 2)
 }
+
+// BUFR matches meteorological data format for storing point or time series data.
+// https://confluence.ecmwf.int/download/attachments/31064617/ecCodes_BUFR_in_a_nutshell.pdf?version=1&modificationDate=1457000352419&api=v2
+func BUFR(raw []byte, _ uint32) bool {
+	return len(raw) > 7 &&
+		bytes.HasPrefix(raw, []byte("BUFR")) &&
+		(raw[7] == 0x03 || raw[7] == 0x04)
+}

mimetype_test.go

@@ -61,6 +61,7 @@ var testcases = []testcase{
 	{"bmp\x7C", "BM            \x7C\x00\x00\x00", "image/bmp", none},
 	{"bmp\x6C", "BM            \x6C\x00\x00\x00", "image/bmp", none},
 	{"bpg", "\x42\x50\x47\xFB", "image/bpg", one},
+	{"bufr", "BUFR   \x03", "application/bufr", one},
 	{"bz2", "\x42\x5A\x68", "application/x-bzip2", one},
 	{"cab", "MSCF\x00\x00\x00\x00", "application/vnd.ms-cab-compressed", one},
 	{"cab.is", "ISc(\x00\x00\x00\x01", "application/x-installshield", one},

supported_mimes.md

@@ -1,4 +1,4 @@
-## 198 Supported MIME types
+## 199 Supported MIME types
 This file is automatically generated when running tests. Do not edit manually.
 
 Extension | MIME type <br> Aliases | Hierarchy
@@ -157,6 +157,7 @@ Extension | MIME type <br> Aliases | Hierarchy
 **.inf** | **application/x-os2-inf** | inf>root
 **.hlp** | **application/x-os2-hlp** | hlp>root
 **.fm** | **application/vnd.framemaker** | fm>root
+**.bufr** | **application/bufr** | bufr>root
 **.txt** | **text/plain** | txt>root
 **.svg** | **image/svg+xml** | svg>txt>root
 **.html** | **text/html** | html>txt>root

tree.go

@@ -24,7 +24,7 @@ var root = newMIME("application/octet-stream", "",
 	woff2, otf, ttc, eot, wasm, shx, dbf, dcm, rar, djvu, mobi, lit, bpg, cbor,
 	sqlite3, dwg, nes, lnk, macho, qcp, icns, hdr, mrc, mdb, accdb, zstd, cab,
 	rpm, xz, lzip, torrent, cpio, tzif, xcf, pat, gbr, glb, cabIS, jxr, parquet,
-	oneNote, chm, wpd, dxf, grib, zlib, inf, hlp, fm,
+	oneNote, chm, wpd, dxf, grib, zlib, inf, hlp, fm, bufr,
 	// Keep text last because it is the slowest check.
 	text,
 )
@@ -293,4 +293,5 @@ var (
 	inf     = newMIME("application/x-os2-inf", ".inf", magic.Inf)
 	hlp     = newMIME("application/x-os2-hlp", ".hlp", magic.Hlp)
 	fm      = newMIME("application/vnd.framemaker", ".fm", magic.FrameMaker)
+	bufr    = newMIME("application/bufr", ".bufr", magic.BUFR)
 )