X-Git-Url: https://git.saurik.com/apple/javascriptcore.git/blobdiff_plain/4be4e30906bcb8ee30b4d189205cb70bad6707ce..81345200c95645a1b0d2635520f96ad55dfde63f:/runtime/DataView.h

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+/*
+ * Copyright (C) 2013 Apple 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:
+ *
+ * 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 APPLE AND ITS 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 APPLE OR ITS 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.
+ */
+
+#ifndef DataView_h
+#define DataView_h
+
+#include "ArrayBufferView.h"
+#include <wtf/FlipBytes.h>
+#include <wtf/PassRefPtr.h>
+
+namespace JSC {
+
+class DataView : public ArrayBufferView {
+protected:
+    DataView(PassRefPtr<ArrayBuffer>, unsigned byteOffset, unsigned byteLength);
+    
+public:
+    JS_EXPORT_PRIVATE static PassRefPtr<DataView> create(PassRefPtr<ArrayBuffer>, unsigned byteOffset, unsigned length);
+    static PassRefPtr<DataView> create(PassRefPtr<ArrayBuffer>);
+    
+    virtual unsigned byteLength() const override
+    {
+        return m_byteLength;
+    }
+    
+    virtual TypedArrayType getType() const override
+    {
+        return TypeDataView;
+    }
+
+    virtual JSArrayBufferView* wrap(ExecState*, JSGlobalObject*) override;
+    
+    template<typename T>
+    T get(unsigned offset, bool littleEndian, bool* status = 0)
+    {
+        if (status) {
+            if (offset + sizeof(T) > byteLength()) {
+                *status = false;
+                return T();
+            }
+            *status = true;
+        } else
+            ASSERT_WITH_SECURITY_IMPLICATION(offset + sizeof(T) <= byteLength());
+        return flipBytesIfLittleEndian(
+            *reinterpret_cast<T*>(static_cast<uint8_t*>(m_baseAddress) + offset),
+            littleEndian);
+    }
+    
+    template<typename T>
+    T read(unsigned& offset, bool littleEndian, bool* status = 0)
+    {
+        T result = this->template get<T>(offset, littleEndian, status);
+        if (!status || *status)
+            offset += sizeof(T);
+        return result;
+    }
+    
+    template<typename T>
+    void set(unsigned offset, T value, bool littleEndian, bool* status = 0)
+    {
+        if (status) {
+            if (offset + sizeof(T) > byteLength()) {
+                *status = false;
+                return;
+            }
+            *status = true;
+        } else
+            ASSERT_WITH_SECURITY_IMPLICATION(offset + sizeof(T) <= byteLength());
+        *reinterpret_cast<T*>(static_cast<uint8_t*>(m_baseAddress) + offset) =
+            flipBytesIfLittleEndian(value, littleEndian);
+    }
+
+private:
+    unsigned m_byteLength;
+};
+
+} // namespace JSC
+
+#endif // DataView_h
+