56 lines
1.7 KiB
Dart
56 lines
1.7 KiB
Dart
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// Copyright (c) 2023, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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import 'default_extension_map.dart';
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/// Default extension for recognized MIME types.
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///
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/// Is the inverse of [defaultExtensionMap], and where that
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/// map has multiple extensions which map to the same
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/// MIME type, this map maps that MIME type to a *default*
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/// extension.
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///
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/// Used by [extensionFromMime].
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final Map<String, String> _defaultMimeTypeMap = {
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for (var entry in defaultExtensionMap.entries) entry.value: entry.key,
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'application/msword': 'doc',
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'application/vnd.ms-excel': 'xls',
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'application/vnd.ms-powerpoint': 'ppt',
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'application/x-debian-package': 'deb',
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'application/xhtml+xml': 'xhtml',
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'application/xml': 'xml',
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'audio/x-aiff': 'aif',
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'audio/midi': 'mid',
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'audio/mp4': 'm4a',
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'audio/ogg': 'ogg',
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'image/jpeg': 'jpg',
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'image/tiff': 'tif',
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'image/svg+xml': 'svg',
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'model/vrml': 'vrml',
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'text/calendar': 'ics',
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'text/html': 'html',
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'text/javascript': 'js',
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'text/markdown': 'md',
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'text/plain': 'txt',
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'text/sgml': 'sgml',
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'text/x-asm': 'asm',
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'text/x-c': 'c',
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'text/x-pascal': 'pas',
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'video/mp4': 'mp4',
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'video/mpeg': 'mpg',
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'video/quicktime': 'mov',
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'video/x-matroska': 'mkv',
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};
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/// The default file extension for a given MIME type.
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///
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/// If [mimeType] has multiple associated extensions,
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/// the returned string is one of those, chosen as the default
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/// extension for that MIME type.
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///
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/// Returns `null` if [mimeType] is not a recognized and
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/// supported MIME type.
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String? extensionFromMime(String mimeType) =>
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_defaultMimeTypeMap[mimeType.toLowerCase()];
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