webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

1 files changed, 162 insertions, 0 deletions

diff --git a/Source/WebKit2/Platform/IPC/Decoder.h b/Source/WebKit2/Platform/IPC/Decoder.h
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+++ b/Source/WebKit2/Platform/IPC/Decoder.h
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+/*
+ * Copyright (C) 2010 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 INC. 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 INC. 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.
+ */
+
+#pragma once
+
+#include "ArgumentCoder.h"
+#include "Attachment.h"
+#include "StringReference.h"
+#include <wtf/EnumTraits.h>
+#include <wtf/Vector.h>
+
+#if HAVE(QOS_CLASSES)
+#include <pthread/qos.h>
+#endif
+
+namespace IPC {
+
+class DataReference;
+class ImportanceAssertion;
+
+class Decoder {
+    WTF_MAKE_FAST_ALLOCATED;
+public:
+    Decoder(const uint8_t* buffer, size_t bufferSize, void (*bufferDeallocator)(const uint8_t*, size_t), Vector<Attachment>);
+    ~Decoder();
+
+    Decoder(const Decoder&) = delete;
+    Decoder(Decoder&&) = delete;
+
+    StringReference messageReceiverName() const { return m_messageReceiverName; }
+    StringReference messageName() const { return m_messageName; }
+    uint64_t destinationID() const { return m_destinationID; }
+
+    bool isSyncMessage() const;
+    bool shouldDispatchMessageWhenWaitingForSyncReply() const;
+    bool shouldUseFullySynchronousModeForTesting() const;
+
+#if PLATFORM(MAC)
+    void setImportanceAssertion(std::unique_ptr<ImportanceAssertion>);
+#endif
+
+#if HAVE(QOS_CLASSES)
+    void setQOSClassOverride(pthread_override_t override) { m_qosClassOverride = override; }
+#endif
+
+    static std::unique_ptr<Decoder> unwrapForTesting(Decoder&);
+
+    size_t length() const { return m_bufferEnd - m_buffer; }
+
+    bool isInvalid() const { return m_bufferPos > m_bufferEnd; }
+    void markInvalid() { m_bufferPos = m_bufferEnd + 1; }
+
+    bool decodeFixedLengthData(uint8_t*, size_t, unsigned alignment);
+
+    // The data in the data reference here will only be valid for the lifetime of the ArgumentDecoder object.
+    bool decodeVariableLengthByteArray(DataReference&);
+
+    bool decode(bool&);
+    bool decode(uint8_t&);
+    bool decode(uint16_t&);
+    bool decode(uint32_t&);
+    bool decode(uint64_t&);
+    bool decode(int32_t&);
+    bool decode(int64_t&);
+    bool decode(float&);
+    bool decode(double&);
+
+    template<typename E>
+    auto decode(E& e) -> std::enable_if_t<std::is_enum<E>::value, bool>
+    {
+        uint64_t value;
+        if (!decode(value))
+            return false;
+        if (!isValidEnum<E>(value))
+            return false;
+
+        e = static_cast<E>(value);
+        return true;
+    }
+
+    template<typename T> bool decodeEnum(T& result)
+    {
+        static_assert(sizeof(T) <= 8, "Enum type T must not be larger than 64 bits!");
+
+        uint64_t value;
+        if (!decode(value))
+            return false;
+        
+        result = static_cast<T>(value);
+        return true;
+    }
+
+    template<typename T>
+    bool bufferIsLargeEnoughToContain(size_t numElements) const
+    {
+        static_assert(std::is_arithmetic<T>::value, "Type T must have a fixed, known encoded size!");
+
+        if (numElements > std::numeric_limits<size_t>::max() / sizeof(T))
+            return false;
+
+        return bufferIsLargeEnoughToContain(alignof(T), numElements * sizeof(T));
+    }
+
+    template<typename T>
+    auto decode(T& t) -> std::enable_if_t<!std::is_enum<T>::value, bool>
+    {
+        return ArgumentCoder<T>::decode(*this, t);
+    }
+
+    bool removeAttachment(Attachment&);
+
+    static const bool isIPCDecoder = true;
+
+private:
+    bool alignBufferPosition(unsigned alignment, size_t);
+    bool bufferIsLargeEnoughToContain(unsigned alignment, size_t) const;
+
+    const uint8_t* m_buffer;
+    const uint8_t* m_bufferPos;
+    const uint8_t* m_bufferEnd;
+    void (*m_bufferDeallocator)(const uint8_t*, size_t);
+
+    Vector<Attachment> m_attachments;
+
+    uint8_t m_messageFlags;
+    StringReference m_messageReceiverName;
+    StringReference m_messageName;
+
+    uint64_t m_destinationID;
+
+#if PLATFORM(MAC)
+    std::unique_ptr<ImportanceAssertion> m_importanceAssertion;
+#endif
+
+#if HAVE(QOS_CLASSES)
+    pthread_override_t m_qosClassOverride { nullptr };
+#endif
+};
+
+} // namespace IPC