Source/core/fileapi/Blob.h

/*
 * Copyright (C) 2010 Google Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * 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
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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 */

#ifndef Blob_h
#define Blob_h

#include "bindings/v8/ScriptWrappable.h"
#include "core/html/URLRegistry.h"
#include "core/platform/network/BlobData.h"
#include "weborigin/KURL.h"
#include "wtf/PassOwnPtr.h"
#include "wtf/PassRefPtr.h"
#include "wtf/RefCounted.h"
#include "wtf/text/WTFString.h"

namespace WebCore {

class ScriptExecutionContext;

class Blob : public ScriptWrappable, public URLRegistrable, public RefCounted<Blob> {
public:
    static PassRefPtr<Blob> create()
    {
        return adoptRef(new Blob);
    }

    static PassRefPtr<Blob> create(PassOwnPtr<BlobData> blobData, long long size)
    {
        return adoptRef(new Blob(blobData, size));
    }

    // For deserialization.
    static PassRefPtr<Blob> create(const KURL& srcURL, const String& type, long long size)
    {
        return adoptRef(new Blob(srcURL, type, size));
    }

    virtual ~Blob();

    const KURL& url() const { return m_internalURL; }
    const String& type() const { return m_type; }

    virtual unsigned long long size() const { return static_cast<unsigned long long>(m_size); }
    virtual bool isFile() const { return false; }

    // URLRegistrable
    virtual URLRegistry& registry() const OVERRIDE;

    PassRefPtr<Blob> slice(long long start = 0, long long end = std::numeric_limits<long long>::max(), const String& contentType = String()) const;

protected:
    Blob();
    Blob(PassOwnPtr<BlobData>, long long size);

    // For deserialization.
    Blob(const KURL& srcURL, const String& type, long long size);

    // This is an internal URL referring to the blob data associated with this object. It serves
    // as an identifier for this blob. The internal URL is never used to source the blob's content
    // into an HTML or for FileRead'ing, public blob URLs must be used for those purposes.
    KURL m_internalURL;

    String m_type;
    long long m_size;
};

} // namespace WebCore

#endif // Blob_h