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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chromeos/binder/writable_transaction_data.h"
#include "chromeos/binder/binder_driver_api.h"
#include "chromeos/binder/constants.h"
#include "chromeos/binder/local_object.h"
#include "chromeos/binder/object.h"
#include "chromeos/binder/remote_object.h"
namespace binder {
WritableTransactionData::WritableTransactionData() {}
WritableTransactionData::~WritableTransactionData() {}
uintptr_t WritableTransactionData::GetCookie() const {
return 0;
}
uint32_t WritableTransactionData::GetCode() const {
return code_;
}
pid_t WritableTransactionData::GetSenderPID() const {
return 0;
}
uid_t WritableTransactionData::GetSenderEUID() const {
return 0;
}
bool WritableTransactionData::IsOneWay() const {
return is_one_way_;
}
bool WritableTransactionData::HasStatus() const {
return false;
}
Status WritableTransactionData::GetStatus() const {
return Status::OK;
}
const void* WritableTransactionData::GetData() const {
return data_.data();
}
size_t WritableTransactionData::GetDataSize() const {
return data_.size();
}
const uintptr_t* WritableTransactionData::GetObjectOffsets() const {
return object_offsets_.data();
}
size_t WritableTransactionData::GetNumObjectOffsets() const {
return object_offsets_.size();
}
void WritableTransactionData::Reserve(size_t n) {
data_.reserve(n);
}
void WritableTransactionData::WriteData(const void* data, size_t n) {
data_.insert(data_.end(), static_cast<const char*>(data),
static_cast<const char*>(data) + n);
if (n % 4 != 0) { // Add padding.
data_.resize(data_.size() + 4 - (n % 4));
}
}
void WritableTransactionData::WriteInt32(int32_t value) {
WriteData(&value, sizeof(value));
}
void WritableTransactionData::WriteUint32(uint32_t value) {
WriteData(&value, sizeof(value));
}
void WritableTransactionData::WriteInt64(int64_t value) {
WriteData(&value, sizeof(value));
}
void WritableTransactionData::WriteUint64(uint64_t value) {
WriteData(&value, sizeof(value));
}
void WritableTransactionData::WriteFloat(float value) {
WriteData(&value, sizeof(value));
}
void WritableTransactionData::WriteDouble(double value) {
WriteData(&value, sizeof(value));
}
void WritableTransactionData::WriteCString(const char* value) {
WriteData(value, strlen(value) + 1);
}
void WritableTransactionData::WriteString(const std::string& value) {
WriteInt32(value.size());
if (value.size() > 0) {
// Write only when the string is not empty.
// This is different from WriteString16().
//
// Despite having the length info, null-terminate the data to be consistent
// with libbinder.
WriteData(value.c_str(), value.size() + 1);
}
}
void WritableTransactionData::WriteString16(const base::string16& value) {
WriteInt32(value.size());
// Despite having the length info, null-terminate the data to be consistent
// with libbinder.
WriteData(value.c_str(), (value.size() + 1) * sizeof(base::char16));
}
void WritableTransactionData::WriteInterfaceToken(
const base::string16& interface,
int32_t strict_mode_policy) {
WriteInt32(kStrictModePenaltyGather | strict_mode_policy);
WriteString16(interface);
}
void WritableTransactionData::WriteObject(scoped_refptr<Object> object) {
objects_.push_back(object); // Hold reference.
flat_binder_object flat = {};
flat.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS;
switch (object->GetType()) {
case Object::TYPE_LOCAL: {
auto* local = static_cast<LocalObject*>(object.get());
flat.type = BINDER_TYPE_BINDER;
flat.cookie = reinterpret_cast<uintptr_t>(local);
// flat.binder is unused, but the driver requires it to be a non-zero
// unique value.
flat.binder = reinterpret_cast<uintptr_t>(local);
break;
}
case Object::TYPE_REMOTE: {
auto* remote = static_cast<RemoteObject*>(object.get());
flat.type = BINDER_TYPE_HANDLE;
flat.handle = remote->GetHandle();
break;
}
}
object_offsets_.push_back(data_.size());
WriteData(&flat, sizeof(flat));
}
void WritableTransactionData::WriteFileDescriptor(base::ScopedFD fd) {
files_.push_back(std::move(fd));
flat_binder_object flat = {};
flat.type = BINDER_TYPE_FD;
flat.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS;
flat.handle = files_.back().get();
object_offsets_.push_back(data_.size());
WriteData(&flat, sizeof(flat));
}
} // namespace binder
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