94 lines
2.4 KiB
C++
94 lines
2.4 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* vim: sw=2 ts=8 et :
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*/
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "GonkNativeHandleUtils.h"
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#include "mozilla/UniquePtr.h"
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#include "mozilla/Unused.h"
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using namespace mozilla::layers;
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namespace IPC {
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namespace {
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class native_handle_Delete
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{
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public:
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void operator()(native_handle* aNativeHandle) const
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{
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native_handle_close(aNativeHandle); // closes file descriptors
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native_handle_delete(aNativeHandle);
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}
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};
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} // anonymous namespace
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void
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ParamTraits<GonkNativeHandle>::Write(Message* aMsg,
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const paramType& aParam)
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{
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GonkNativeHandle handle = aParam;
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MOZ_ASSERT(handle.IsValid());
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RefPtr<GonkNativeHandle::NhObj> nhObj = handle.GetAndResetNhObj();
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native_handle_t* nativeHandle = nhObj->GetAndResetNativeHandle();
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size_t nbytes = nativeHandle->numInts * sizeof(int);
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aMsg->WriteSize(nbytes);
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aMsg->WriteBytes((nativeHandle->data + nativeHandle->numFds), nbytes);
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for (size_t i = 0; i < static_cast<size_t>(nativeHandle->numFds); ++i) {
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aMsg->WriteFileDescriptor(base::FileDescriptor(nativeHandle->data[i], true));
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}
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}
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bool
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ParamTraits<GonkNativeHandle>::Read(const Message* aMsg,
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PickleIterator* aIter, paramType* aResult)
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{
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size_t nbytes;
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if (!aMsg->ReadSize(aIter, &nbytes)) {
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return false;
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}
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if (nbytes % sizeof(int) != 0) {
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return false;
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}
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size_t numInts = nbytes / sizeof(int);
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size_t numFds = aMsg->num_fds();
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mozilla::UniquePtr<native_handle, native_handle_Delete> nativeHandle(
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native_handle_create(numFds, numInts));
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if (!nativeHandle) {
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return false;
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}
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auto data =
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reinterpret_cast<char*>(nativeHandle->data + nativeHandle->numFds);
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if (!aMsg->ReadBytesInto(aIter, data, nbytes)) {
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return false;
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}
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for (size_t i = 0; i < numFds; ++i) {
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base::FileDescriptor fd;
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if (!aMsg->ReadFileDescriptor(aIter, &fd)) {
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return false;
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}
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nativeHandle->data[i] = fd.fd;
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nativeHandle->numFds = i + 1; // set number of valid file descriptors
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}
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GonkNativeHandle handle(new GonkNativeHandle::NhObj(nativeHandle.get()));
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handle.TransferToAnother(*aResult);
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mozilla::Unused << nativeHandle.release();
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return true;
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}
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} // namespace IPC
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