1 files changed, 114 insertions, 0 deletions
diff --git a/Source/WebKit2/Platform/qt/MappedMemoryPool.cpp b/Source/WebKit2/Platform/qt/MappedMemoryPool.cpp
new file mode 100644
index 0000000..d36d82b
--- /dev/null
+++ b/Source/WebKit2/Platform/qt/MappedMemoryPool.cpp
@@ -0,0 +1,114 @@
+/*
+ * Copyright (C) 2010 University of Szeged
+ * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY UNIVERSITY OF SZEGED ``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 UNIVERSITY OF SZEGED 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 "MappedMemoryPool.h"
+
+#include "CleanupHandler.h"
+#include "StdLibExtras.h"
+#include <QDir>
+#include <QIODevice>
+#include <QTemporaryFile>
+
+namespace WebKit {
+
+MappedMemoryPool* MappedMemoryPool::theInstance = 0;
+
+MappedMemoryPool* MappedMemoryPool::instance()
+{
+    if (!theInstance) {
+        theInstance = new MappedMemoryPool;
+
+        // Do not leave mapping files on the disk.
+        CleanupHandler::instance()->markForCleanup(theInstance);
+    }
+
+    return theInstance;
+}
+
+MappedMemoryPool::~MappedMemoryPool()
+{
+    CleanupHandler::instance()->unmark(theInstance);
+
+    for (unsigned n = 0; n < m_pool.size(); ++n) {
+        MappedMemory& current = m_pool.at(n);
+        if (!current.file)
+            continue;
+        current.file->remove();
+        delete current.file;
+    }
+    m_pool.clear();
+}
+
+MappedMemory* MappedMemoryPool::mapMemory(size_t size)
+{
+    for (unsigned n = 0; n < m_pool.size(); ++n) {
+        MappedMemory& current = m_pool.at(n);
+        if (current.dataSize >= size && current.isFree()) {
+            current.markUsed();
+            return &current;
+        }
+    }
+
+    MappedMemory newMap;
+    newMap.dataSize = size;
+    newMap.file = new QTemporaryFile(QDir::tempPath() + "/WebKit2UpdateChunk");
+    newMap.file->open(QIODevice::ReadWrite);
+    newMap.fileName = newMap.file->fileName();
+    newMap.file->resize(newMap.mapSize());
+    newMap.mappedBytes = newMap.file->map(0, newMap.mapSize());
+    newMap.file->close();
+    newMap.markUsed();
+    m_pool.append(newMap);
+    return &m_pool.last();
+}
+
+MappedMemory* MappedMemoryPool::mapFile(QString fileName, size_t size)
+{
+    for (unsigned n = 0; n < m_pool.size(); ++n) {
+        MappedMemory& current = m_pool.at(n);
+        if (current.fileName == fileName) {
+            ASSERT(!current.isFree());
+            return &current;
+        }
+    }
+
+    MappedMemory newMap;
+    newMap.file = new QFile(fileName);
+    newMap.fileName = fileName;
+    newMap.dataSize = size;
+    ASSERT(newMap.file->exists());
+    ASSERT(newMap.file->size() >= newMap.mapSize());
+    newMap.file->open(QIODevice::ReadWrite);
+    newMap.mappedBytes = newMap.file->map(0, newMap.mapSize());
+    ASSERT(newMap.mappedBytes);
+    ASSERT(!newMap.isFree());
+    newMap.file->close();
+    m_pool.append(newMap);
+    return &m_pool.last();
+}
+
+} // namespace WebKit