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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "HidlSupport"
#include <hidl/HidlSupport.h>
#include <unordered_map>
#include <android-base/logging.h>
#include <android-base/parseint.h>
namespace android {
namespace hardware {
namespace details {
bool debuggable() {
#ifdef LIBHIDL_TARGET_DEBUGGABLE
return true;
#else
return false;
#endif
}
} // namespace details
hidl_handle::hidl_handle() : mHandle(nullptr), mOwnsHandle(false) {
memset(mPad, 0, sizeof(mPad));
}
hidl_handle::~hidl_handle() {
freeHandle();
}
hidl_handle::hidl_handle(const native_handle_t* handle) : hidl_handle() {
mHandle = handle;
mOwnsHandle = false;
}
// copy constructor.
hidl_handle::hidl_handle(const hidl_handle& other) : hidl_handle() {
mOwnsHandle = false;
*this = other;
}
// move constructor.
hidl_handle::hidl_handle(hidl_handle&& other) noexcept : hidl_handle() {
mOwnsHandle = false;
*this = std::move(other);
}
// assignment operators
hidl_handle &hidl_handle::operator=(const hidl_handle &other) {
if (this == &other) {
return *this;
}
freeHandle();
if (other.mHandle != nullptr) {
mHandle = native_handle_clone(other.mHandle);
if (mHandle == nullptr) {
PLOG(FATAL) << "Failed to clone native_handle in hidl_handle";
}
mOwnsHandle = true;
} else {
mHandle = nullptr;
mOwnsHandle = false;
}
return *this;
}
hidl_handle &hidl_handle::operator=(const native_handle_t *native_handle) {
freeHandle();
mHandle = native_handle;
mOwnsHandle = false;
return *this;
}
hidl_handle& hidl_handle::operator=(hidl_handle&& other) noexcept {
if (this != &other) {
freeHandle();
mHandle = other.mHandle;
mOwnsHandle = other.mOwnsHandle;
other.mHandle = nullptr;
other.mOwnsHandle = false;
}
return *this;
}
void hidl_handle::setTo(native_handle_t* handle, bool shouldOwn) {
freeHandle();
mHandle = handle;
mOwnsHandle = shouldOwn;
}
const native_handle_t* hidl_handle::operator->() const {
return mHandle;
}
// implicit conversion to const native_handle_t*
hidl_handle::operator const native_handle_t *() const {
return mHandle;
}
// explicit conversion
const native_handle_t *hidl_handle::getNativeHandle() const {
return mHandle;
}
void hidl_handle::freeHandle() {
if (mOwnsHandle && mHandle != nullptr) {
// This can only be true if:
// 1. Somebody called setTo() with shouldOwn=true, so we know the handle
// wasn't const to begin with.
// 2. Copy/assignment from another hidl_handle, in which case we have
// cloned the handle.
// 3. Move constructor from another hidl_handle, in which case the original
// hidl_handle must have been non-const as well.
native_handle_t *handle = const_cast<native_handle_t*>(
static_cast<const native_handle_t*>(mHandle));
native_handle_close(handle);
native_handle_delete(handle);
mHandle = nullptr;
}
}
static const char *const kEmptyString = "";
hidl_string::hidl_string() : mBuffer(kEmptyString), mSize(0), mOwnsBuffer(false) {
memset(mPad, 0, sizeof(mPad));
}
hidl_string::~hidl_string() {
clear();
}
hidl_string::hidl_string(const char *s) : hidl_string() {
if (s == nullptr) {
return;
}
copyFrom(s, strlen(s));
}
hidl_string::hidl_string(const char *s, size_t length) : hidl_string() {
copyFrom(s, length);
}
hidl_string::hidl_string(const hidl_string &other): hidl_string() {
copyFrom(other.c_str(), other.size());
}
hidl_string::hidl_string(const std::string &s) : hidl_string() {
copyFrom(s.c_str(), s.size());
}
hidl_string::hidl_string(hidl_string&& other) noexcept : hidl_string() {
moveFrom(std::forward<hidl_string>(other));
}
hidl_string& hidl_string::operator=(hidl_string&& other) noexcept {
if (this != &other) {
clear();
moveFrom(std::forward<hidl_string>(other));
}
return *this;
}
hidl_string &hidl_string::operator=(const hidl_string &other) {
if (this != &other) {
clear();
copyFrom(other.c_str(), other.size());
}
return *this;
}
hidl_string &hidl_string::operator=(const char *s) {
clear();
if (s == nullptr) {
return *this;
}
copyFrom(s, strlen(s));
return *this;
}
hidl_string &hidl_string::operator=(const std::string &s) {
clear();
copyFrom(s.c_str(), s.size());
return *this;
}
hidl_string::operator std::string() const {
return std::string(mBuffer, mSize);
}
std::ostream& operator<<(std::ostream& os, const hidl_string& str) {
os << str.c_str();
return os;
}
void hidl_string::copyFrom(const char *data, size_t size) {
// assume my resources are freed.
if (size >= UINT32_MAX) {
LOG(FATAL) << "string size can't exceed 2^32 bytes: " << size;
}
if (size == 0) {
mBuffer = kEmptyString;
mSize = 0;
mOwnsBuffer = false;
return;
}
char *buf = (char *)malloc(size + 1);
memcpy(buf, data, size);
buf[size] = '\0';
mBuffer = buf;
mSize = static_cast<uint32_t>(size);
mOwnsBuffer = true;
}
void hidl_string::moveFrom(hidl_string &&other) {
// assume my resources are freed.
mBuffer = std::move(other.mBuffer);
mSize = other.mSize;
mOwnsBuffer = other.mOwnsBuffer;
other.mOwnsBuffer = false;
other.clear();
}
void hidl_string::clear() {
if (mOwnsBuffer && (mBuffer != kEmptyString)) {
free(const_cast<char *>(static_cast<const char *>(mBuffer)));
}
mBuffer = kEmptyString;
mSize = 0;
mOwnsBuffer = false;
}
void hidl_string::setToExternal(const char *data, size_t size) {
if (size > UINT32_MAX) {
LOG(FATAL) << "string size can't exceed 2^32 bytes: " << size;
}
// When the binder driver copies this data into its buffer, it must
// have a zero byte there because the remote process will have a pointer
// directly into the read-only binder buffer. If we manually copy the
// data now to add a zero, then we lose the efficiency of this method.
// Checking here (it's also checked in the parceling code later).
CHECK(data[size] == '\0');
clear();
mBuffer = data;
mSize = static_cast<uint32_t>(size);
mOwnsBuffer = false;
}
const char *hidl_string::c_str() const {
return mBuffer;
}
size_t hidl_string::size() const {
return mSize;
}
bool hidl_string::empty() const {
return mSize == 0;
}
sp<HidlMemory> HidlMemory::getInstance(const hidl_memory& mem) {
sp<HidlMemory> instance = new HidlMemory();
instance->hidl_memory::operator=(mem);
return instance;
}
sp<HidlMemory> HidlMemory::getInstance(hidl_memory&& mem) {
sp<HidlMemory> instance = new HidlMemory();
instance->hidl_memory::operator=(std::move(mem));
return instance;
}
sp<HidlMemory> HidlMemory::getInstance(const hidl_string& name, int fd, uint64_t size) {
native_handle_t* handle = native_handle_create(1, 0);
if (!handle) {
close(fd);
LOG(ERROR) << "native_handle_create fails";
return new HidlMemory();
}
handle->data[0] = fd;
hidl_handle hidlHandle;
hidlHandle.setTo(handle, true /* shouldOwn */);
sp<HidlMemory> instance = new HidlMemory(name, std::move(hidlHandle), size);
return instance;
}
HidlMemory::HidlMemory() : hidl_memory() {}
HidlMemory::HidlMemory(const hidl_string& name, hidl_handle&& handle, size_t size)
: hidl_memory(name, std::move(handle), size) {}
// it's required to have at least one out-of-line method to avoid weak vtable
HidlMemory::~HidlMemory() {}
} // namespace hardware
} // namespace android