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