1 files changed, 135 insertions, 0 deletions
diff --git a/WebCore/fileapi/BlobBuilder.cpp b/WebCore/fileapi/BlobBuilder.cpp
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+++ b/WebCore/fileapi/BlobBuilder.cpp
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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 "BlobBuilder.h"
+
+#include "Blob.h"
+#include "ExceptionCode.h"
+#include "File.h"
+#include "LineEnding.h"
+#include "TextEncoding.h"
+#include <wtf/text/AtomicString.h>
+
+namespace WebCore {
+
+static CString convertToCString(const String& text, const String& endingType, ExceptionCode& ec)
+{
+    DEFINE_STATIC_LOCAL(AtomicString, transparent, ("transparent"));
+    DEFINE_STATIC_LOCAL(AtomicString, native, ("native"));
+
+    ec = 0;
+
+    if (endingType.isEmpty() || endingType == transparent)
+        return UTF8Encoding().encode(text.characters(), text.length(), EntitiesForUnencodables);
+    if (endingType == native)
+        return normalizeLineEndingsToNative(UTF8Encoding().encode(text.characters(), text.length(), EntitiesForUnencodables));
+
+    ec = SYNTAX_ERR;
+    return CString();
+}
+
+static CString concatenateTwoCStrings(const CString& a, const CString& b)
+{
+    if (a.isNull() && b.isNull())
+        return CString();
+
+    char* q;
+    CString result = CString::newUninitialized(a.length() + b.length(), q);
+    if (a.length())
+        memcpy(q, a.data(), a.length());
+    if (b.length())
+        memcpy(q + a.length(), b.data(), b.length());
+    return result;
+}
+
+BlobBuilder::BlobBuilder()
+    : m_size(0)
+{
+}
+
+bool BlobBuilder::append(const String& text, const String& endingType, ExceptionCode& ec)
+{
+    CString cstr = convertToCString(text, endingType, ec);
+    if (ec)
+        return false;
+
+    m_size += cstr.length();
+
+    // If the last item is a string, concatenate it with current string.
+    if (!m_items.isEmpty() && m_items[m_items.size() - 1].type == BlobDataItem::Data)
+        m_items[m_items.size() - 1].data = concatenateTwoCStrings(m_items[m_items.size() - 1].data, cstr);
+    else
+        m_items.append(BlobDataItem(cstr));
+    return true;
+}
+
+bool BlobBuilder::append(const String& text, ExceptionCode& ec)
+{
+    return append(text, String(), ec);
+}
+
+bool BlobBuilder::append(PassRefPtr<Blob> blob)
+{
+    if (blob->isFile()) {
+        // If the blob is file that is not snapshoted, capture the snapshot now.
+        // FIXME: This involves synchronous file operation. We need to figure out how to make it asynchronous.
+        File* file = static_cast<File*>(blob.get());
+        long long snapshotSize;
+        double snapshotModificationTime;
+        file->captureSnapshot(snapshotSize, snapshotModificationTime);
+
+        m_size += snapshotSize;
+        m_items.append(BlobDataItem(file->path(), 0, snapshotSize, snapshotModificationTime));
+    } else {
+        long long blobSize = static_cast<long long>(blob->size());
+        m_size += blobSize;
+        m_items.append(BlobDataItem(blob->url(), 0, blobSize));
+    }
+    return true;
+}
+
+PassRefPtr<Blob> BlobBuilder::getBlob(ScriptExecutionContext* scriptExecutionContext, const String& contentType)
+{
+    OwnPtr<BlobData> blobData = BlobData::create();
+    blobData->setContentType(contentType);
+    blobData->swapItems(m_items);
+
+    RefPtr<Blob> blob = Blob::create(scriptExecutionContext, blobData.release(), m_size);
+
+    // After creating a blob from the current blob data, we do not need to keep the data around any more. Instead, we only
+    // need to keep a reference to the URL of the blob just created.
+    m_items.append(BlobDataItem(blob->url(), 0, m_size));
+
+    return blob;
+}
+
+} // namespace WebCore