third_party/WebKit/Source/platform/MIMETypeRegistry.cpp

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#include "platform/MIMETypeRegistry.h"

#include "platform/plugins/PluginData.h"
#include "public/platform/Platform.h"
#include "public/platform/WebMimeRegistry.h"
#include "wtf/text/CString.h"

namespace blink {

String MIMETypeRegistry::getMIMETypeForExtension(const String &ext)
{
    return Platform::current()->mimeRegistry()->mimeTypeForExtension(ext);
}

String MIMETypeRegistry::getWellKnownMIMETypeForExtension(const String &ext)
{
    // This method must be thread safe and should not consult the OS/registry.
    return Platform::current()->mimeRegistry()->wellKnownMimeTypeForExtension(ext);
}

String MIMETypeRegistry::getMIMETypeForPath(const String& path)
{
    int pos = path.reverseFind('.');
    if (pos < 0)
        return "application/octet-stream";
    String extension = path.substring(pos + 1);
    String mimeType = getMIMETypeForExtension(extension);
    if (mimeType.isEmpty()) {
        // If there's no mimetype registered for the extension, check to see
        // if a plugin can handle the extension.
        mimeType = getPluginMimeTypeFromExtension(extension);
    }
    if (mimeType.isEmpty())
        return "application/octet-stream";
    return mimeType;
}

bool MIMETypeRegistry::isSupportedImageMIMEType(const String& mimeType)
{
    return Platform::current()->mimeRegistry()->supportsImageMIMEType(mimeType.lower())
        != WebMimeRegistry::IsNotSupported;
}

bool MIMETypeRegistry::isSupportedImageResourceMIMEType(const String& mimeType)
{
    return isSupportedImageMIMEType(mimeType);
}

bool MIMETypeRegistry::isSupportedImagePrefixedMIMEType(const String& mimeType)
{
    return Platform::current()->mimeRegistry()->supportsImagePrefixedMIMEType(mimeType.lower())
        != WebMimeRegistry::IsNotSupported;
}

bool MIMETypeRegistry::isSupportedImageMIMETypeForEncoding(const String& mimeType)
{
    if (equalIgnoringCase(mimeType, "image/jpeg") || equalIgnoringCase(mimeType, "image/png"))
        return true;
    if (equalIgnoringCase(mimeType, "image/webp"))
        return true;
    return false;
}

bool MIMETypeRegistry::isSupportedJavaScriptMIMEType(const String& mimeType)
{
    return Platform::current()->mimeRegistry()->supportsJavaScriptMIMEType(mimeType.lower())
        != WebMimeRegistry::IsNotSupported;
}

bool MIMETypeRegistry::isSupportedNonImageMIMEType(const String& mimeType)
{
    return Platform::current()->mimeRegistry()->supportsNonImageMIMEType(mimeType.lower())
        != WebMimeRegistry::IsNotSupported;
}

bool MIMETypeRegistry::isSupportedMediaSourceMIMEType(const String& mimeType, const String& codecs)
{
    return !mimeType.isEmpty()
        && Platform::current()->mimeRegistry()->supportsMediaSourceMIMEType(mimeType.lower(), codecs);
}

bool MIMETypeRegistry::isJavaAppletMIMEType(const String& mimeType)
{
    // Since this set is very limited and is likely to remain so we won't bother with the overhead
    // of using a hash set.
    // Any of the MIME types below may be followed by any number of specific versions of the JVM,
    // which is why we use startsWith()
    return mimeType.startsWith("application/x-java-applet", TextCaseInsensitive)
        || mimeType.startsWith("application/x-java-bean", TextCaseInsensitive)
        || mimeType.startsWith("application/x-java-vm", TextCaseInsensitive);
}

bool MIMETypeRegistry::isSupportedStyleSheetMIMEType(const String& mimeType)
{
    return equalIgnoringCase(mimeType, "text/css");
}

bool MIMETypeRegistry::isSupportedFontMIMEType(const String& mimeType)
{
    static const unsigned fontLen = 5;
    if (!mimeType.startsWith("font/", TextCaseInsensitive))
        return false;
    String subType = mimeType.substring(fontLen).lower();
    return subType == "woff" || subType == "woff2" || subType == "otf" || subType == "ttf" || subType == "sfnt";
}

bool MIMETypeRegistry::isSupportedTextTrackMIMEType(const String& mimeType)
{
    return equalIgnoringCase(mimeType, "text/vtt");
}

} // namespace blink