********** WebCore blob hacking

WebCore/fileapi/Blob.cpp

 /*
  * 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
@@ skipping 22 matching lines @@
 
 #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)
+Blob::Blob(PassRefPtr<BlobDataHandle> dataHandle)
+    : m_blobDataHandle(dataHandle)
 {
-    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);
+    ASSERT(m_blobDataHandle);
 }
 
 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;
+        size = this->size();
+        ASSERT(size != -1);
     }
 
     // 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);
+            blobData->appendFileSystemURL(toFile(this)->fileSystemURL(), start, length, modificationTime);
         else
 #endif
         blobData->appendFile(toFile(this)->path(), start, length, modificationTime);
     } else
-        blobData->appendBlob(m_internalURL, start, length);
+        blobData->appendBlob(m_blobDataHandle, start, length);
 
-    return Blob::create(blobData.release(), length);
+    return Blob::create(BlobDataHandle::create(blobData.release(), length));
 }
 #endif
 
 } // namespace WebCore