Source/core/fileapi/Blob.h

/*
 * Copyright (C) 2010 Google Inc. All rights reserved.
 *
 * 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
 * distribution.
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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
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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 */

#ifndef Blob_h
#define Blob_h

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

namespace WebCore {

class ExecutionContext;

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

    static PassRefPtr<Blob> create(PassRefPtr<BlobDataHandle> blobDataHandle)
    {
        return adoptRef(new Blob(blobDataHandle));
    }

    virtual ~Blob();

    String uuid() const { return m_blobDataHandle->uuid(); }
    String type() const {  return m_blobDataHandle->type(); }
    virtual unsigned long long size() const { return m_blobDataHandle->size(); }
    // True for all File instances, including the user-built ones.
    virtual bool isFile() const { return false; }
    // Only true for File instances that are backed by platform files.
    virtual bool hasBackingFile() const { return false; }
    PassRefPtr<BlobDataHandle> blobDataHandle() const { return m_blobDataHandle; }
    PassRefPtr<Blob> slice(long long start = 0, long long end = std::numeric_limits<long long>::max(), const String& contentType = String()) const;

    // URLRegistrable to support PublicURLs.
    virtual URLRegistry& registry() const OVERRIDE;

protected:
    explicit Blob(PassRefPtr<BlobDataHandle>);

private:
    Blob();
    RefPtr<BlobDataHandle> m_blobDataHandle;
};

} // namespace WebCore

#endif // Blob_h