419 lines
15 KiB
C++
419 lines
15 KiB
C++
/*
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* Copyright (C) 2005 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_PARCEL_H
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#define ANDROID_PARCEL_H
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#include <cutils/native_handle.h>
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#include <utils/Errors.h>
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#include <utils/RefBase.h>
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#include <utils/String16.h>
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#include <utils/Vector.h>
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#include <utils/Flattenable.h>
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#include <linux/binder.h>
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// ---------------------------------------------------------------------------
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namespace android {
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template <typename T> class Flattenable;
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template <typename T> class LightFlattenable;
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class IBinder;
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class IPCThreadState;
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class ProcessState;
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class String8;
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class TextOutput;
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class Parcel {
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friend class IPCThreadState;
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public:
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class ReadableBlob;
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class WritableBlob;
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Parcel();
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~Parcel();
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const uint8_t* data() const;
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size_t dataSize() const;
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size_t dataAvail() const;
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size_t dataPosition() const;
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size_t dataCapacity() const;
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status_t setDataSize(size_t size);
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void setDataPosition(size_t pos) const;
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status_t setDataCapacity(size_t size);
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status_t setData(const uint8_t* buffer, size_t len);
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status_t appendFrom(const Parcel *parcel,
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size_t start, size_t len);
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bool pushAllowFds(bool allowFds);
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void restoreAllowFds(bool lastValue);
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bool hasFileDescriptors() const;
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// Writes the RPC header.
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status_t writeInterfaceToken(const String16& interface);
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// Parses the RPC header, returning true if the interface name
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// in the header matches the expected interface from the caller.
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//
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// Additionally, enforceInterface does part of the work of
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// propagating the StrictMode policy mask, populating the current
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// IPCThreadState, which as an optimization may optionally be
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// passed in.
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bool enforceInterface(const String16& interface,
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IPCThreadState* threadState = NULL) const;
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bool checkInterface(IBinder*) const;
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void freeData();
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private:
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const binder_size_t* objects() const;
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public:
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size_t objectsCount() const;
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status_t errorCheck() const;
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void setError(status_t err);
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status_t write(const void* data, size_t len);
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void* writeInplace(size_t len);
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status_t writeUnpadded(const void* data, size_t len);
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status_t writeInt32(int32_t val);
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status_t writeInt64(int64_t val);
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status_t writeFloat(float val);
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status_t writeDouble(double val);
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status_t writeCString(const char* str);
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status_t writeString8(const String8& str);
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status_t writeString16(const String16& str);
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status_t writeString16(const char16_t* str, size_t len);
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status_t writeStrongBinder(const sp<IBinder>& val);
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status_t writeWeakBinder(const wp<IBinder>& val);
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status_t writeInt32Array(size_t len, const int32_t *val);
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status_t writeByteArray(size_t len, const uint8_t *val);
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template<typename T>
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status_t write(const Flattenable<T>& val);
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template<typename T>
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status_t write(const LightFlattenable<T>& val);
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// Place a native_handle into the parcel (the native_handle's file-
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// descriptors are dup'ed, so it is safe to delete the native_handle
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// when this function returns).
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// Doesn't take ownership of the native_handle.
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status_t writeNativeHandle(const native_handle* handle);
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// Place a file descriptor into the parcel. The given fd must remain
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// valid for the lifetime of the parcel.
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// The Parcel does not take ownership of the given fd unless you ask it to.
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status_t writeFileDescriptor(int fd, bool takeOwnership = false);
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// Place a file descriptor into the parcel. A dup of the fd is made, which
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// will be closed once the parcel is destroyed.
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status_t writeDupFileDescriptor(int fd);
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// Writes a raw fd and optional comm channel fd to the parcel as a ParcelFileDescriptor.
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// A dup's of the fds are made, which will be closed once the parcel is destroyed.
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// Null values are passed as -1.
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status_t writeParcelFileDescriptor(int fd, int commChannel = -1);
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// Writes a blob to the parcel.
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// If the blob is small, then it is stored in-place, otherwise it is
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// transferred by way of an anonymous shared memory region.
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// The caller should call release() on the blob after writing its contents.
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status_t writeBlob(size_t len, WritableBlob* outBlob);
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status_t writeObject(const flat_binder_object& val, bool nullMetaData);
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// Like Parcel.java's writeNoException(). Just writes a zero int32.
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// Currently the native implementation doesn't do any of the StrictMode
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// stack gathering and serialization that the Java implementation does.
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status_t writeNoException();
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void remove(size_t start, size_t amt);
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status_t read(void* outData, size_t len) const;
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const void* readInplace(size_t len) const;
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int32_t readInt32() const;
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status_t readInt32(int32_t *pArg) const;
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int64_t readInt64() const;
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status_t readInt64(int64_t *pArg) const;
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float readFloat() const;
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status_t readFloat(float *pArg) const;
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double readDouble() const;
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status_t readDouble(double *pArg) const;
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intptr_t readIntPtr() const;
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status_t readIntPtr(intptr_t *pArg) const;
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const char* readCString() const;
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String8 readString8() const;
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String16 readString16() const;
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const char16_t* readString16Inplace(size_t* outLen) const;
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sp<IBinder> readStrongBinder() const;
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wp<IBinder> readWeakBinder() const;
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template<typename T>
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status_t read(Flattenable<T>& val) const;
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template<typename T>
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status_t read(LightFlattenable<T>& val) const;
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// Like Parcel.java's readExceptionCode(). Reads the first int32
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// off of a Parcel's header, returning 0 or the negative error
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// code on exceptions, but also deals with skipping over rich
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// response headers. Callers should use this to read & parse the
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// response headers rather than doing it by hand.
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int32_t readExceptionCode() const;
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// Retrieve native_handle from the parcel. This returns a copy of the
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// parcel's native_handle (the caller takes ownership). The caller
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// must free the native_handle with native_handle_close() and
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// native_handle_delete().
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native_handle* readNativeHandle() const;
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// Retrieve a file descriptor from the parcel. This returns the raw fd
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// in the parcel, which you do not own -- use dup() to get your own copy.
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int readFileDescriptor() const;
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// Reads a ParcelFileDescriptor from the parcel. Returns the raw fd as
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// the result, and the optional comm channel fd in outCommChannel.
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// Null values are returned as -1.
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int readParcelFileDescriptor(int& outCommChannel) const;
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// Reads a blob from the parcel.
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// The caller should call release() on the blob after reading its contents.
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status_t readBlob(size_t len, ReadableBlob* outBlob) const;
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const flat_binder_object* readObject(bool nullMetaData) const;
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// Explicitly close all file descriptors in the parcel.
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void closeFileDescriptors();
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// Debugging: get metrics on current allocations.
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static size_t getGlobalAllocSize();
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static size_t getGlobalAllocCount();
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private:
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typedef void (*release_func)(Parcel* parcel,
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const uint8_t* data, size_t dataSize,
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const binder_size_t* objects, size_t objectsSize,
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void* cookie);
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uintptr_t ipcData() const;
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size_t ipcDataSize() const;
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uintptr_t ipcObjects() const;
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size_t ipcObjectsCount() const;
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void ipcSetDataReference(const uint8_t* data, size_t dataSize,
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const binder_size_t* objects, size_t objectsCount,
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release_func relFunc, void* relCookie);
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public:
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void print(TextOutput& to, uint32_t flags = 0) const;
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private:
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Parcel(const Parcel& o);
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Parcel& operator=(const Parcel& o);
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status_t finishWrite(size_t len);
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void releaseObjects();
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void acquireObjects();
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status_t growData(size_t len);
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status_t restartWrite(size_t desired);
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status_t continueWrite(size_t desired);
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status_t writePointer(uintptr_t val);
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status_t readPointer(uintptr_t *pArg) const;
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uintptr_t readPointer() const;
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void freeDataNoInit();
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void initState();
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void scanForFds() const;
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template<class T>
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status_t readAligned(T *pArg) const;
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template<class T> T readAligned() const;
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template<class T>
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status_t writeAligned(T val);
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status_t mError;
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uint8_t* mData;
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size_t mDataSize;
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size_t mDataCapacity;
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mutable size_t mDataPos;
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binder_size_t* mObjects;
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size_t mObjectsSize;
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size_t mObjectsCapacity;
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mutable size_t mNextObjectHint;
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mutable bool mFdsKnown;
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mutable bool mHasFds;
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bool mAllowFds;
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release_func mOwner;
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void* mOwnerCookie;
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class Blob {
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public:
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Blob();
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~Blob();
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void release();
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inline size_t size() const { return mSize; }
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protected:
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void init(bool mapped, void* data, size_t size);
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void clear();
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bool mMapped;
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void* mData;
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size_t mSize;
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};
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class FlattenableHelperInterface {
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protected:
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~FlattenableHelperInterface() { }
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public:
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virtual size_t getFlattenedSize() const = 0;
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virtual size_t getFdCount() const = 0;
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virtual status_t flatten(void* buffer, size_t size, int* fds, size_t count) const = 0;
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virtual status_t unflatten(void const* buffer, size_t size, int const* fds, size_t count) = 0;
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};
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template<typename T>
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class FlattenableHelper : public FlattenableHelperInterface {
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friend class Parcel;
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const Flattenable<T>& val;
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explicit FlattenableHelper(const Flattenable<T>& val) : val(val) { }
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public:
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virtual size_t getFlattenedSize() const {
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return val.getFlattenedSize();
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}
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virtual size_t getFdCount() const {
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return val.getFdCount();
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}
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virtual status_t flatten(void* buffer, size_t size, int* fds, size_t count) const {
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return val.flatten(buffer, size, fds, count);
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}
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virtual status_t unflatten(void const* buffer, size_t size, int const* fds, size_t count) {
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return const_cast<Flattenable<T>&>(val).unflatten(buffer, size, fds, count);
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}
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};
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status_t write(const FlattenableHelperInterface& val);
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status_t read(FlattenableHelperInterface& val) const;
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public:
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class ReadableBlob : public Blob {
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friend class Parcel;
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public:
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inline const void* data() const { return mData; }
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};
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class WritableBlob : public Blob {
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friend class Parcel;
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public:
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inline void* data() { return mData; }
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};
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};
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// ---------------------------------------------------------------------------
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template<typename T>
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status_t Parcel::write(const Flattenable<T>& val) {
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const FlattenableHelper<T> helper(val);
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return write(helper);
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}
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template<typename T>
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status_t Parcel::write(const LightFlattenable<T>& val) {
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size_t size(val.getFlattenedSize());
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if (!val.isFixedSize()) {
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status_t err = writeInt32(size);
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if (err != NO_ERROR) {
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return err;
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}
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}
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if (size) {
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void* buffer = writeInplace(size);
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if (buffer == NULL)
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return NO_MEMORY;
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return val.flatten(buffer, size);
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}
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return NO_ERROR;
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}
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template<typename T>
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status_t Parcel::read(Flattenable<T>& val) const {
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FlattenableHelper<T> helper(val);
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return read(helper);
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}
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template<typename T>
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status_t Parcel::read(LightFlattenable<T>& val) const {
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size_t size;
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if (val.isFixedSize()) {
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size = val.getFlattenedSize();
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} else {
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int32_t s;
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status_t err = readInt32(&s);
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if (err != NO_ERROR) {
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return err;
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}
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size = s;
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}
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if (size) {
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void const* buffer = readInplace(size);
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return buffer == NULL ? NO_MEMORY :
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val.unflatten(buffer, size);
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}
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return NO_ERROR;
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}
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// ---------------------------------------------------------------------------
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inline TextOutput& operator<<(TextOutput& to, const Parcel& parcel)
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{
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parcel.print(to);
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return to;
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}
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// ---------------------------------------------------------------------------
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// Generic acquire and release of objects.
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void acquire_object(const sp<ProcessState>& proc,
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const flat_binder_object& obj, const void* who);
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void release_object(const sp<ProcessState>& proc,
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const flat_binder_object& obj, const void* who);
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void flatten_binder(const sp<ProcessState>& proc,
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const sp<IBinder>& binder, flat_binder_object* out);
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void flatten_binder(const sp<ProcessState>& proc,
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const wp<IBinder>& binder, flat_binder_object* out);
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status_t unflatten_binder(const sp<ProcessState>& proc,
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const flat_binder_object& flat, sp<IBinder>* out);
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status_t unflatten_binder(const sp<ProcessState>& proc,
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const flat_binder_object& flat, wp<IBinder>* out);
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}; // namespace android
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// ---------------------------------------------------------------------------
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#endif // ANDROID_PARCEL_H
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