third_party/WebKit/Source/platform/MIMETypeFromURL.cpp

/*
 * Copyright (C) 2004, 2007, 2008, 2011, 2012 Apple Inc. All rights reserved.
 * Copyright (C) 2012 Research In Motion Limited. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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#include "platform/MIMETypeFromURL.h"

#include "platform/MIMETypeRegistry.h"
#include "platform/weborigin/KURL.h"
#include "wtf/text/WTFString.h"

namespace blink {

String mimeTypeFromDataURL(const String& url) {
  ASSERT(protocolIs(url, "data"));
  size_t index = url.find(';');
  if (index == kNotFound)
    index = url.find(',');
  if (index != kNotFound) {
    if (index > 5)
      return url.substring(5, index - 5).lower();
    // Data URLs with no MIME type are considered text/plain.
    return "text/plain";
  }
  return "";
}

String mimeTypeFromURL(const KURL& url) {
  String decodedPath = decodeURLEscapeSequences(url.path());
  String extension = decodedPath.substring(decodedPath.reverseFind('.') + 1);

  // We don't use MIMETypeRegistry::getMIMETypeForPath() because it returns
  // "application/octet-stream" upon failure
  return MIMETypeRegistry::getMIMETypeForExtension(extension);
}

}  // namespace blink