webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

1 files changed, 261 insertions, 0 deletions

diff --git a/Source/WebKit2/Platform/IPC/Encoder.cpp b/Source/WebKit2/Platform/IPC/Encoder.cpp
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index 000000000..6cd7471d1
--- /dev/null
+++ b/Source/WebKit2/Platform/IPC/Encoder.cpp
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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.
+ */
+
+#include "config.h"
+#include "Encoder.h"
+
+#include "DataReference.h"
+#include "MessageFlags.h"
+#include <algorithm>
+#include <stdio.h>
+
+#if OS(DARWIN)
+#include <sys/mman.h>
+#endif
+
+namespace IPC {
+
+static const uint8_t defaultMessageFlags = 0;
+
+template <typename T>
+static inline bool allocBuffer(T*& buffer, size_t size)
+{
+#if OS(DARWIN)
+    buffer = static_cast<T*>(mmap(0, size, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0));
+    return buffer != MAP_FAILED;
+#else
+    buffer = static_cast<T*>(fastMalloc(size));
+    return !!buffer;
+#endif
+}
+
+static inline void freeBuffer(void* addr, size_t size)
+{
+#if OS(DARWIN)
+    munmap(addr, size);
+#else
+    UNUSED_PARAM(size);
+    fastFree(addr);
+#endif
+}
+
+Encoder::Encoder(StringReference messageReceiverName, StringReference messageName, uint64_t destinationID)
+    : m_messageReceiverName(messageReceiverName)
+    , m_messageName(messageName)
+    , m_destinationID(destinationID)
+    , m_buffer(m_inlineBuffer)
+    , m_bufferPointer(m_inlineBuffer)
+    , m_bufferSize(0)
+    , m_bufferCapacity(sizeof(m_inlineBuffer))
+{
+    encodeHeader();
+}
+
+Encoder::~Encoder()
+{
+    if (m_buffer != m_inlineBuffer)
+        freeBuffer(m_buffer, m_bufferCapacity);
+    // FIXME: We need to dispose of the attachments in cases of failure.
+}
+
+bool Encoder::isSyncMessage() const
+{
+    return *buffer() & SyncMessage;
+}
+
+bool Encoder::shouldDispatchMessageWhenWaitingForSyncReply() const
+{
+    return *buffer() & DispatchMessageWhenWaitingForSyncReply;
+}
+
+void Encoder::setIsSyncMessage(bool isSyncMessage)
+{
+    if (isSyncMessage)
+        *buffer() |= SyncMessage;
+    else
+        *buffer() &= ~SyncMessage;
+}
+
+void Encoder::setShouldDispatchMessageWhenWaitingForSyncReply(bool shouldDispatchMessageWhenWaitingForSyncReply)
+{
+    if (shouldDispatchMessageWhenWaitingForSyncReply)
+        *buffer() |= DispatchMessageWhenWaitingForSyncReply;
+    else
+        *buffer() &= ~DispatchMessageWhenWaitingForSyncReply;
+}
+
+void Encoder::setFullySynchronousModeForTesting()
+{
+    *buffer() |= UseFullySynchronousModeForTesting;
+}
+
+void Encoder::wrapForTesting(std::unique_ptr<Encoder> original)
+{
+    ASSERT(isSyncMessage());
+    ASSERT(!original->isSyncMessage());
+
+    original->setShouldDispatchMessageWhenWaitingForSyncReply(true);
+
+    encodeVariableLengthByteArray(DataReference(original->buffer(), original->bufferSize()));
+
+    Vector<Attachment> attachments = original->releaseAttachments();
+    reserve(attachments.size());
+    for (Attachment& attachment : attachments)
+        addAttachment(WTFMove(attachment));
+}
+
+static inline size_t roundUpToAlignment(size_t value, unsigned alignment)
+{
+    return ((value + alignment - 1) / alignment) * alignment;
+}
+
+void Encoder::reserve(size_t size)
+{
+    if (size <= m_bufferCapacity)
+        return;
+
+    size_t newCapacity = roundUpToAlignment(m_bufferCapacity * 2, 4096);
+    while (newCapacity < size)
+        newCapacity *= 2;
+
+    uint8_t* newBuffer;
+    if (!allocBuffer(newBuffer, newCapacity))
+        CRASH();
+
+    memcpy(newBuffer, m_buffer, m_bufferSize);
+
+    if (m_buffer != m_inlineBuffer)
+        freeBuffer(m_buffer, m_bufferCapacity);
+
+    m_buffer = newBuffer;
+    m_bufferCapacity = newCapacity;
+}
+
+void Encoder::encodeHeader()
+{
+    ASSERT(!m_messageReceiverName.isEmpty());
+
+    *this << defaultMessageFlags;
+    *this << m_messageReceiverName;
+    *this << m_messageName;
+    *this << m_destinationID;
+}
+
+uint8_t* Encoder::grow(unsigned alignment, size_t size)
+{
+    size_t alignedSize = roundUpToAlignment(m_bufferSize, alignment);
+    reserve(alignedSize + size);
+
+    m_bufferSize = alignedSize + size;
+    m_bufferPointer = m_buffer + alignedSize + size;
+    
+    return m_buffer + alignedSize;
+}
+
+void Encoder::encodeFixedLengthData(const uint8_t* data, size_t size, unsigned alignment)
+{
+    ASSERT(!(reinterpret_cast<uintptr_t>(data) % alignment));
+
+    uint8_t* buffer = grow(alignment, size);
+    memcpy(buffer, data, size);
+}
+
+void Encoder::encodeVariableLengthByteArray(const DataReference& dataReference)
+{
+    encode(static_cast<uint64_t>(dataReference.size()));
+    encodeFixedLengthData(dataReference.data(), dataReference.size(), 1);
+}
+
+template<typename Type>
+static void copyValueToBuffer(Type value, uint8_t* bufferPosition)
+{
+    memcpy(bufferPosition, &value, sizeof(Type));
+}
+
+void Encoder::encode(bool n)
+{
+    uint8_t* buffer = grow(sizeof(n), sizeof(n));
+    copyValueToBuffer(n, buffer);
+}
+
+void Encoder::encode(uint8_t n)
+{
+    uint8_t* buffer = grow(sizeof(n), sizeof(n));
+    copyValueToBuffer(n, buffer);
+}
+
+void Encoder::encode(uint16_t n)
+{
+    uint8_t* buffer = grow(sizeof(n), sizeof(n));
+    copyValueToBuffer(n, buffer);
+}
+
+void Encoder::encode(uint32_t n)
+{
+    uint8_t* buffer = grow(sizeof(n), sizeof(n));
+    copyValueToBuffer(n, buffer);
+}
+
+void Encoder::encode(uint64_t n)
+{
+    uint8_t* buffer = grow(sizeof(n), sizeof(n));
+    copyValueToBuffer(n, buffer);
+}
+
+void Encoder::encode(int32_t n)
+{
+    uint8_t* buffer = grow(sizeof(n), sizeof(n));
+    copyValueToBuffer(n, buffer);
+}
+
+void Encoder::encode(int64_t n)
+{
+    uint8_t* buffer = grow(sizeof(n), sizeof(n));
+    copyValueToBuffer(n, buffer);
+}
+
+void Encoder::encode(float n)
+{
+    uint8_t* buffer = grow(sizeof(n), sizeof(n));
+    copyValueToBuffer(n, buffer);
+}
+
+void Encoder::encode(double n)
+{
+    uint8_t* buffer = grow(sizeof(n), sizeof(n));
+    copyValueToBuffer(n, buffer);
+}
+
+void Encoder::addAttachment(Attachment&& attachment)
+{
+    m_attachments.append(WTFMove(attachment));
+}
+
+Vector<Attachment> Encoder::releaseAttachments()
+{
+    return WTFMove(m_attachments);
+}
+
+} // namespace IPC