/*

 * 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.

 *     * Neither the name of Google Inc. nor the names of its

 * 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

 * OWNER 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 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

#include "config.h"

#include "Blob.h"

#include "BlobItem.h"

#include "FileSystem.h"

namespace WebCore {

Blob::Blob(const String& type, const BlobItemList& items)

    : m_type(type)

{

    for (size_t i = 0; i < items.size(); ++i)

        m_items.append(items[i]);

}

Blob::Blob(const PassRefPtr<BlobItem>& item)

{

    m_items.append(item);

}

Blob::Blob(const String& path)

{

    // Note: this doesn't initialize the type unlike File(path).

    m_items.append(FileBlobItem::create(path));

}

unsigned long long Blob::size() const

{

    // FIXME: JavaScript cannot represent sizes as large as unsigned long long, we need to

    // come up with an exception to throw if file size is not represetable.

    unsigned long long size = 0;

    for (size_t i = 0; i < m_items.size(); ++i)

        size += m_items[i]->size();

    return size;

}

const String& Blob::path() const

{

    ASSERT(m_items.size() == 1 && m_items[0]->toFileBlobItem());

    return m_items[0]->toFileBlobItem()->path();

}

#if ENABLE(BLOB_SLICE)

PassRefPtr<Blob> Blob::slice(long long start, long long length, const String& contentType) const

{

    if (start < 0)

        start = 0;

    if (length < 0)

        length = 0;

    // Clamp the range if it exceeds the size limit.

    unsigned long long totalSize = size();

    if (static_cast<unsigned long long>(start) > totalSize) {

        start = 0;

        length = 0;

    } else if (static_cast<unsigned long long>(start + length) > totalSize)

        length = totalSize - start;

    size_t i = 0;

    BlobItemList items;

    for (; i < m_items.size() && static_cast<unsigned long long>(start) >= m_items[i]->size(); ++i)

        start -= m_items[i]->size();

    for (; length > 0 && i < m_items.size(); ++i) {

        items.append(m_items[i]->slice(start, length));

        length -= items.last()->size();

        start = 0;

    }

    return Blob::create(contentType, items);

}

#endif // ENABLE(BLOB_SLICE)

} // namespace WebCore