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/*
* 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 "BlobURL.h"
#include "File.h"
#include "HistogramSupport.h"
#include "ScriptCallStack.h"
#include "ScriptExecutionContext.h"
#include "ThreadableBlobRegistry.h"
namespace WebCore {
namespace {
// Used in histograms to see when we can actually deprecate the prefixed slice.
enum SliceHistogramEnum {
SliceWithoutPrefix,
SliceWithPrefix,
SliceHistogramEnumMax,
};
} // namespace
Blob::Blob()
: m_size(0)
{
OwnPtr<BlobData> blobData = BlobData::create();
// Create a new internal URL and register it with the provided blob data.
m_internalURL = BlobURL::createInternalURL();
ThreadableBlobRegistry::registerBlobURL(m_internalURL, blobData.release());
}
Blob::Blob(PassOwnPtr<BlobData> blobData, long long size)
: m_type(blobData->contentType())
, m_size(size)
{
ASSERT(blobData);
// Create a new internal URL and register it with the provided blob data.
m_internalURL = BlobURL::createInternalURL();
ThreadableBlobRegistry::registerBlobURL(m_internalURL, blobData);
}
Blob::Blob(const KURL& srcURL, const String& type, long long size)
: m_type(type)
, m_size(size)
{
// Create a new internal URL and register it with the same blob data as the source URL.
m_internalURL = BlobURL::createInternalURL();
ThreadableBlobRegistry::registerBlobURL(0, m_internalURL, srcURL);
}
Blob::~Blob()
{
ThreadableBlobRegistry::unregisterBlobURL(m_internalURL);
}
#if ENABLE(BLOB)
PassRefPtr<Blob> Blob::slice(long long start, long long end, const String& contentType) const
{
// When we slice a file for the first time, we obtain a snapshot of the file by capturing its current size and modification time.
// The modification time will be used to verify if the file has been changed or not, when the underlying data are accessed.
long long size;
double modificationTime;
if (isFile()) {
// FIXME: This involves synchronous file operation. We need to figure out how to make it asynchronous.
toFile(this)->captureSnapshot(size, modificationTime);
} else {
ASSERT(m_size != -1);
size = m_size;
}
// Convert the negative value that is used to select from the end.
if (start < 0)
start = start + size;
if (end < 0)
end = end + size;
// Clamp the range if it exceeds the size limit.
if (start < 0)
start = 0;
if (end < 0)
end = 0;
if (start >= size) {
start = 0;
end = 0;
} else if (end < start)
end = start;
else if (end > size)
end = size;
long long length = end - start;
OwnPtr<BlobData> blobData = BlobData::create();
blobData->setContentType(contentType);
if (isFile()) {
#if ENABLE(FILE_SYSTEM)
if (!toFile(this)->fileSystemURL().isEmpty())
blobData->appendURL(toFile(this)->fileSystemURL(), start, length, modificationTime);
else
#endif
blobData->appendFile(toFile(this)->path(), start, length, modificationTime);
} else
blobData->appendBlob(m_internalURL, start, length);
return Blob::create(blobData.release(), length);
}
#endif
} // namespace WebCore
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