LibCore+Userland: Add two more detectable formats

Second batch of detectable formats, this time with verious offsets, as
enabled by the previous commit.
This adds tar, and the three signature variants for iso-9660 image
files.

Userland/Libraries/LibCore/MimeData.cpp

@@ -93,6 +93,9 @@ String guess_mime_type_based_on_filename(const StringView& path)
     __ENUMERATE_MIME_TYPE_HEADER(gif_87, "image/gif", 0, 6, 'G', 'I', 'F', '8', '7', 'a')                                                        \
     __ENUMERATE_MIME_TYPE_HEADER(gif_89, "image/gif", 0, 6, 'G', 'I', 'F', '8', '9', 'a')                                                        \
     __ENUMERATE_MIME_TYPE_HEADER(gzip, "application/gzip", 0, 2, 0x1F, 0x8B)                                                                     \
+    __ENUMERATE_MIME_TYPE_HEADER(iso9660_0, "extra/iso-9660", 0x8001, 5, 0x43, 0x44, 0x30, 0x30, 0x31)                                           \
+    __ENUMERATE_MIME_TYPE_HEADER(iso9660_1, "extra/iso-9660", 0x8801, 5, 0x43, 0x44, 0x30, 0x30, 0x31)                                           \
+    __ENUMERATE_MIME_TYPE_HEADER(iso9660_2, "extra/iso-9660", 0x9001, 5, 0x43, 0x44, 0x30, 0x30, 0x31)                                           \
     __ENUMERATE_MIME_TYPE_HEADER(jpeg, "image/jpeg", 0, 4, 0xFF, 0xD8, 0xFF, 0xDB)                                                               \
     __ENUMERATE_MIME_TYPE_HEADER(jpeg_huh, "image/jpeg", 0, 4, 0xFF, 0xD8, 0xFF, 0xEE)                                                           \
     __ENUMERATE_MIME_TYPE_HEADER(jpeg_jfif, "image/jpeg", 0, 12, 0xFF, 0xD8, 0xFF, 0xE0, 0x00, 0x10, 'J', 'F', 'I', 'F', 0x00, 0x01)             \
@@ -104,6 +107,7 @@ String guess_mime_type_based_on_filename(const StringView& path)
     __ENUMERATE_MIME_TYPE_HEADER(sevenzip, "application/x-7z-compressed", 0, 6, 0x37, 0x7A, 0xBC, 0xAF, 0x27, 0x1C)                              \
     __ENUMERATE_MIME_TYPE_HEADER(shell, "text/x-shellscript", 0, 10, '#', '!', '/', 'b', 'i', 'n', '/', 's', 'h', '\n')                          \
     __ENUMERATE_MIME_TYPE_HEADER(sqlite, "extra/sqlite", 0, 16, 'S', 'Q', 'L', 'i', 't', 'e', ' ', 'f', 'o', 'r', 'm', 'a', 't', ' ', '3', 0x00) \
+    __ENUMERATE_MIME_TYPE_HEADER(tar, "application/tar", 0x101, 5, 0x75, 0x73, 0x74, 0x61, 0x72)                                                 \
     __ENUMERATE_MIME_TYPE_HEADER(tiff, "image/tiff", 0, 4, 'I', 'I', '*', 0x00)                                                                  \
     __ENUMERATE_MIME_TYPE_HEADER(tiff_bigendian, "image/tiff", 0, 4, 'M', 'M', 0x00, '*')
 

Userland/Utilities/file.cpp

@@ -56,9 +56,11 @@ static Optional<String> gzip_details(String description, const String& path)
     __ENUMERATE_MIME_TYPE_DESCRIPTION("application/gzip", "gzip compressed data", gzip_details)         \
     __ENUMERATE_MIME_TYPE_DESCRIPTION("application/javascript", "JavaScript source", description_only)  \
     __ENUMERATE_MIME_TYPE_DESCRIPTION("application/json", "JSON data", description_only)                \
+    __ENUMERATE_MIME_TYPE_DESCRIPTION("application/tar", "tape archive", description_only)              \
     __ENUMERATE_MIME_TYPE_DESCRIPTION("application/x-7z-compressed", "7-Zip archive", description_only) \
     __ENUMERATE_MIME_TYPE_DESCRIPTION("audio/midi", "MIDI sound", description_only)                     \
     __ENUMERATE_MIME_TYPE_DESCRIPTION("extra/flac", "FLAC audio", description_only)                     \
+    __ENUMERATE_MIME_TYPE_DESCRIPTION("extra/iso-9660", "ISO 9660 CD/DVD image", description_only)      \
     __ENUMERATE_MIME_TYPE_DESCRIPTION("extra/sqlite", "sqlite database", description_only)              \
     __ENUMERATE_MIME_TYPE_DESCRIPTION("image/bmp", "BMP image data", image_details)                     \
     __ENUMERATE_MIME_TYPE_DESCRIPTION("image/gif", "GIF image data", image_details)                     \
@@ -105,7 +107,8 @@ int main(int argc, char** argv)
             all_ok = false;
             continue;
         }
-        auto bytes = file->read(25);
+        // Read accounts for longest possible offset + signature we currently match against.
+        auto bytes = file->read(0x9006);
         auto file_name_guess = Core::guess_mime_type_based_on_filename(path);
         auto mime_type = Core::guess_mime_type_based_on_sniffed_bytes(bytes.bytes()).value_or(file_name_guess);
         auto human_readable_description = get_description_from_mime_type(mime_type, String(path)).value_or(mime_type);