diff options
Diffstat (limited to 'libs/binder/Parcel.cpp')
| -rw-r--r-- | libs/binder/Parcel.cpp | 1336 |
1 files changed, 1336 insertions, 0 deletions
diff --git a/libs/binder/Parcel.cpp b/libs/binder/Parcel.cpp new file mode 100644 index 0000000..e397bce --- /dev/null +++ b/libs/binder/Parcel.cpp @@ -0,0 +1,1336 @@ +/* + * Copyright (C) 2005 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 "Parcel" +//#define LOG_NDEBUG 0 + +#include <binder/Parcel.h> + +#include <binder/Binder.h> +#include <binder/BpBinder.h> +#include <utils/Debug.h> +#include <binder/ProcessState.h> +#include <utils/Log.h> +#include <utils/String8.h> +#include <utils/String16.h> +#include <utils/TextOutput.h> +#include <utils/misc.h> + +#include <private/binder/binder_module.h> + +#include <stdio.h> +#include <stdlib.h> +#include <stdint.h> + +#ifndef INT32_MAX +#define INT32_MAX ((int32_t)(2147483647)) +#endif + +#define LOG_REFS(...) +//#define LOG_REFS(...) LOG(LOG_DEBUG, "Parcel", __VA_ARGS__) + +// --------------------------------------------------------------------------- + +#define PAD_SIZE(s) (((s)+3)&~3) + +// XXX This can be made public if we want to provide +// support for typed data. +struct small_flat_data +{ + uint32_t type; + uint32_t data; +}; + +namespace android { + +void acquire_object(const sp<ProcessState>& proc, + const flat_binder_object& obj, const void* who) +{ + switch (obj.type) { + case BINDER_TYPE_BINDER: + if (obj.binder) { + LOG_REFS("Parcel %p acquiring reference on local %p", who, obj.cookie); + static_cast<IBinder*>(obj.cookie)->incStrong(who); + } + return; + case BINDER_TYPE_WEAK_BINDER: + if (obj.binder) + static_cast<RefBase::weakref_type*>(obj.binder)->incWeak(who); + return; + case BINDER_TYPE_HANDLE: { + const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle); + if (b != NULL) { + LOG_REFS("Parcel %p acquiring reference on remote %p", who, b.get()); + b->incStrong(who); + } + return; + } + case BINDER_TYPE_WEAK_HANDLE: { + const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle); + if (b != NULL) b.get_refs()->incWeak(who); + return; + } + case BINDER_TYPE_FD: { + // intentionally blank -- nothing to do to acquire this, but we do + // recognize it as a legitimate object type. + return; + } + } + + LOGD("Invalid object type 0x%08lx", obj.type); +} + +void release_object(const sp<ProcessState>& proc, + const flat_binder_object& obj, const void* who) +{ + switch (obj.type) { + case BINDER_TYPE_BINDER: + if (obj.binder) { + LOG_REFS("Parcel %p releasing reference on local %p", who, obj.cookie); + static_cast<IBinder*>(obj.cookie)->decStrong(who); + } + return; + case BINDER_TYPE_WEAK_BINDER: + if (obj.binder) + static_cast<RefBase::weakref_type*>(obj.binder)->decWeak(who); + return; + case BINDER_TYPE_HANDLE: { + const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle); + if (b != NULL) { + LOG_REFS("Parcel %p releasing reference on remote %p", who, b.get()); + b->decStrong(who); + } + return; + } + case BINDER_TYPE_WEAK_HANDLE: { + const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle); + if (b != NULL) b.get_refs()->decWeak(who); + return; + } + case BINDER_TYPE_FD: { + if (obj.cookie != (void*)0) close(obj.handle); + return; + } + } + + LOGE("Invalid object type 0x%08lx", obj.type); +} + +inline static status_t finish_flatten_binder( + const sp<IBinder>& binder, const flat_binder_object& flat, Parcel* out) +{ + return out->writeObject(flat, false); +} + +status_t flatten_binder(const sp<ProcessState>& proc, + const sp<IBinder>& binder, Parcel* out) +{ + flat_binder_object obj; + + obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; + if (binder != NULL) { + IBinder *local = binder->localBinder(); + if (!local) { + BpBinder *proxy = binder->remoteBinder(); + if (proxy == NULL) { + LOGE("null proxy"); + } + const int32_t handle = proxy ? proxy->handle() : 0; + obj.type = BINDER_TYPE_HANDLE; + obj.handle = handle; + obj.cookie = NULL; + } else { + obj.type = BINDER_TYPE_BINDER; + obj.binder = local->getWeakRefs(); + obj.cookie = local; + } + } else { + obj.type = BINDER_TYPE_BINDER; + obj.binder = NULL; + obj.cookie = NULL; + } + + return finish_flatten_binder(binder, obj, out); +} + +status_t flatten_binder(const sp<ProcessState>& proc, + const wp<IBinder>& binder, Parcel* out) +{ + flat_binder_object obj; + + obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; + if (binder != NULL) { + sp<IBinder> real = binder.promote(); + if (real != NULL) { + IBinder *local = real->localBinder(); + if (!local) { + BpBinder *proxy = real->remoteBinder(); + if (proxy == NULL) { + LOGE("null proxy"); + } + const int32_t handle = proxy ? proxy->handle() : 0; + obj.type = BINDER_TYPE_WEAK_HANDLE; + obj.handle = handle; + obj.cookie = NULL; + } else { + obj.type = BINDER_TYPE_WEAK_BINDER; + obj.binder = binder.get_refs(); + obj.cookie = binder.unsafe_get(); + } + return finish_flatten_binder(real, obj, out); + } + + // XXX How to deal? In order to flatten the given binder, + // we need to probe it for information, which requires a primary + // reference... but we don't have one. + // + // The OpenBinder implementation uses a dynamic_cast<> here, + // but we can't do that with the different reference counting + // implementation we are using. + LOGE("Unable to unflatten Binder weak reference!"); + obj.type = BINDER_TYPE_BINDER; + obj.binder = NULL; + obj.cookie = NULL; + return finish_flatten_binder(NULL, obj, out); + + } else { + obj.type = BINDER_TYPE_BINDER; + obj.binder = NULL; + obj.cookie = NULL; + return finish_flatten_binder(NULL, obj, out); + } +} + +inline static status_t finish_unflatten_binder( + BpBinder* proxy, const flat_binder_object& flat, const Parcel& in) +{ + return NO_ERROR; +} + +status_t unflatten_binder(const sp<ProcessState>& proc, + const Parcel& in, sp<IBinder>* out) +{ + const flat_binder_object* flat = in.readObject(false); + + if (flat) { + switch (flat->type) { + case BINDER_TYPE_BINDER: + *out = static_cast<IBinder*>(flat->cookie); + return finish_unflatten_binder(NULL, *flat, in); + case BINDER_TYPE_HANDLE: + *out = proc->getStrongProxyForHandle(flat->handle); + return finish_unflatten_binder( + static_cast<BpBinder*>(out->get()), *flat, in); + } + } + return BAD_TYPE; +} + +status_t unflatten_binder(const sp<ProcessState>& proc, + const Parcel& in, wp<IBinder>* out) +{ + const flat_binder_object* flat = in.readObject(false); + + if (flat) { + switch (flat->type) { + case BINDER_TYPE_BINDER: + *out = static_cast<IBinder*>(flat->cookie); + return finish_unflatten_binder(NULL, *flat, in); + case BINDER_TYPE_WEAK_BINDER: + if (flat->binder != NULL) { + out->set_object_and_refs( + static_cast<IBinder*>(flat->cookie), + static_cast<RefBase::weakref_type*>(flat->binder)); + } else { + *out = NULL; + } + return finish_unflatten_binder(NULL, *flat, in); + case BINDER_TYPE_HANDLE: + case BINDER_TYPE_WEAK_HANDLE: + *out = proc->getWeakProxyForHandle(flat->handle); + return finish_unflatten_binder( + static_cast<BpBinder*>(out->unsafe_get()), *flat, in); + } + } + return BAD_TYPE; +} + +// --------------------------------------------------------------------------- + +Parcel::Parcel() +{ + initState(); +} + +Parcel::~Parcel() +{ + freeDataNoInit(); +} + +const uint8_t* Parcel::data() const +{ + return mData; +} + +size_t Parcel::dataSize() const +{ + return (mDataSize > mDataPos ? mDataSize : mDataPos); +} + +size_t Parcel::dataAvail() const +{ + // TODO: decide what to do about the possibility that this can + // report an available-data size that exceeds a Java int's max + // positive value, causing havoc. Fortunately this will only + // happen if someone constructs a Parcel containing more than two + // gigabytes of data, which on typical phone hardware is simply + // not possible. + return dataSize() - dataPosition(); +} + +size_t Parcel::dataPosition() const +{ + return mDataPos; +} + +size_t Parcel::dataCapacity() const +{ + return mDataCapacity; +} + +status_t Parcel::setDataSize(size_t size) +{ + status_t err; + err = continueWrite(size); + if (err == NO_ERROR) { + mDataSize = size; + LOGV("setDataSize Setting data size of %p to %d\n", this, mDataSize); + } + return err; +} + +void Parcel::setDataPosition(size_t pos) const +{ + mDataPos = pos; + mNextObjectHint = 0; +} + +status_t Parcel::setDataCapacity(size_t size) +{ + if (size > mDataSize) return continueWrite(size); + return NO_ERROR; +} + +status_t Parcel::setData(const uint8_t* buffer, size_t len) +{ + status_t err = restartWrite(len); + if (err == NO_ERROR) { + memcpy(const_cast<uint8_t*>(data()), buffer, len); + mDataSize = len; + mFdsKnown = false; + } + return err; +} + +status_t Parcel::appendFrom(Parcel *parcel, size_t offset, size_t len) +{ + const sp<ProcessState> proc(ProcessState::self()); + status_t err; + uint8_t *data = parcel->mData; + size_t *objects = parcel->mObjects; + size_t size = parcel->mObjectsSize; + int startPos = mDataPos; + int firstIndex = -1, lastIndex = -2; + + if (len == 0) { + return NO_ERROR; + } + + // range checks against the source parcel size + if ((offset > parcel->mDataSize) + || (len > parcel->mDataSize) + || (offset + len > parcel->mDataSize)) { + return BAD_VALUE; + } + + // Count objects in range + for (int i = 0; i < (int) size; i++) { + size_t off = objects[i]; + if ((off >= offset) && (off < offset + len)) { + if (firstIndex == -1) { + firstIndex = i; + } + lastIndex = i; + } + } + int numObjects = lastIndex - firstIndex + 1; + + // grow data + err = growData(len); + if (err != NO_ERROR) { + return err; + } + + // append data + memcpy(mData + mDataPos, data + offset, len); + mDataPos += len; + mDataSize += len; + + if (numObjects > 0) { + // grow objects + if (mObjectsCapacity < mObjectsSize + numObjects) { + int newSize = ((mObjectsSize + numObjects)*3)/2; + size_t *objects = + (size_t*)realloc(mObjects, newSize*sizeof(size_t)); + if (objects == (size_t*)0) { + return NO_MEMORY; + } + mObjects = objects; + mObjectsCapacity = newSize; + } + + // append and acquire objects + int idx = mObjectsSize; + for (int i = firstIndex; i <= lastIndex; i++) { + size_t off = objects[i] - offset + startPos; + mObjects[idx++] = off; + mObjectsSize++; + + flat_binder_object* flat + = reinterpret_cast<flat_binder_object*>(mData + off); + acquire_object(proc, *flat, this); + + if (flat->type == BINDER_TYPE_FD) { + // If this is a file descriptor, we need to dup it so the + // new Parcel now owns its own fd, and can declare that we + // officially know we have fds. + flat->handle = dup(flat->handle); + flat->cookie = (void*)1; + mHasFds = mFdsKnown = true; + } + } + } + + return NO_ERROR; +} + +bool Parcel::hasFileDescriptors() const +{ + if (!mFdsKnown) { + scanForFds(); + } + return mHasFds; +} + +status_t Parcel::writeInterfaceToken(const String16& interface) +{ + // currently the interface identification token is just its name as a string + return writeString16(interface); +} + +bool Parcel::checkInterface(IBinder* binder) const +{ + return enforceInterface(binder->getInterfaceDescriptor()); +} + +bool Parcel::enforceInterface(const String16& interface) const +{ + const String16 str(readString16()); + if (str == interface) { + return true; + } else { + LOGW("**** enforceInterface() expected '%s' but read '%s'\n", + String8(interface).string(), String8(str).string()); + return false; + } +} + +const size_t* Parcel::objects() const +{ + return mObjects; +} + +size_t Parcel::objectsCount() const +{ + return mObjectsSize; +} + +status_t Parcel::errorCheck() const +{ + return mError; +} + +void Parcel::setError(status_t err) +{ + mError = err; +} + +status_t Parcel::finishWrite(size_t len) +{ + //printf("Finish write of %d\n", len); + mDataPos += len; + LOGV("finishWrite Setting data pos of %p to %d\n", this, mDataPos); + if (mDataPos > mDataSize) { + mDataSize = mDataPos; + LOGV("finishWrite Setting data size of %p to %d\n", this, mDataSize); + } + //printf("New pos=%d, size=%d\n", mDataPos, mDataSize); + return NO_ERROR; +} + +status_t Parcel::writeUnpadded(const void* data, size_t len) +{ + size_t end = mDataPos + len; + if (end < mDataPos) { + // integer overflow + return BAD_VALUE; + } + + if (end <= mDataCapacity) { +restart_write: + memcpy(mData+mDataPos, data, len); + return finishWrite(len); + } + + status_t err = growData(len); + if (err == NO_ERROR) goto restart_write; + return err; +} + +status_t Parcel::write(const void* data, size_t len) +{ + void* const d = writeInplace(len); + if (d) { + memcpy(d, data, len); + return NO_ERROR; + } + return mError; +} + +void* Parcel::writeInplace(size_t len) +{ + const size_t padded = PAD_SIZE(len); + + // sanity check for integer overflow + if (mDataPos+padded < mDataPos) { + return NULL; + } + + if ((mDataPos+padded) <= mDataCapacity) { +restart_write: + //printf("Writing %ld bytes, padded to %ld\n", len, padded); + uint8_t* const data = mData+mDataPos; + + // Need to pad at end? + if (padded != len) { +#if BYTE_ORDER == BIG_ENDIAN + static const uint32_t mask[4] = { + 0x00000000, 0xffffff00, 0xffff0000, 0xff000000 + }; +#endif +#if BYTE_ORDER == LITTLE_ENDIAN + static const uint32_t mask[4] = { + 0x00000000, 0x00ffffff, 0x0000ffff, 0x000000ff + }; +#endif + //printf("Applying pad mask: %p to %p\n", (void*)mask[padded-len], + // *reinterpret_cast<void**>(data+padded-4)); + *reinterpret_cast<uint32_t*>(data+padded-4) &= mask[padded-len]; + } + + finishWrite(padded); + return data; + } + + status_t err = growData(padded); + if (err == NO_ERROR) goto restart_write; + return NULL; +} + +status_t Parcel::writeInt32(int32_t val) +{ + return writeAligned(val); +} + +status_t Parcel::writeInt64(int64_t val) +{ + return writeAligned(val); +} + +status_t Parcel::writeFloat(float val) +{ + return writeAligned(val); +} + +status_t Parcel::writeDouble(double val) +{ + return writeAligned(val); +} + +status_t Parcel::writeIntPtr(intptr_t val) +{ + return writeAligned(val); +} + +status_t Parcel::writeCString(const char* str) +{ + return write(str, strlen(str)+1); +} + +status_t Parcel::writeString8(const String8& str) +{ + status_t err = writeInt32(str.bytes()); + if (err == NO_ERROR) { + err = write(str.string(), str.bytes()+1); + } + return err; +} + +status_t Parcel::writeString16(const String16& str) +{ + return writeString16(str.string(), str.size()); +} + +status_t Parcel::writeString16(const char16_t* str, size_t len) +{ + if (str == NULL) return writeInt32(-1); + + status_t err = writeInt32(len); + if (err == NO_ERROR) { + len *= sizeof(char16_t); + uint8_t* data = (uint8_t*)writeInplace(len+sizeof(char16_t)); + if (data) { + memcpy(data, str, len); + *reinterpret_cast<char16_t*>(data+len) = 0; + return NO_ERROR; + } + err = mError; + } + return err; +} + +status_t Parcel::writeStrongBinder(const sp<IBinder>& val) +{ + return flatten_binder(ProcessState::self(), val, this); +} + +status_t Parcel::writeWeakBinder(const wp<IBinder>& val) +{ + return flatten_binder(ProcessState::self(), val, this); +} + +status_t Parcel::writeNativeHandle(const native_handle* handle) +{ + if (!handle || handle->version != sizeof(native_handle)) + return BAD_TYPE; + + status_t err; + err = writeInt32(handle->numFds); + if (err != NO_ERROR) return err; + + err = writeInt32(handle->numInts); + if (err != NO_ERROR) return err; + + for (int i=0 ; err==NO_ERROR && i<handle->numFds ; i++) + err = writeDupFileDescriptor(handle->data[i]); + + if (err != NO_ERROR) { + LOGD("write native handle, write dup fd failed"); + return err; + } + err = write(handle->data + handle->numFds, sizeof(int)*handle->numInts); + return err; +} + +status_t Parcel::writeFileDescriptor(int fd) +{ + flat_binder_object obj; + obj.type = BINDER_TYPE_FD; + obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; + obj.handle = fd; + obj.cookie = (void*)0; + return writeObject(obj, true); +} + +status_t Parcel::writeDupFileDescriptor(int fd) +{ + flat_binder_object obj; + obj.type = BINDER_TYPE_FD; + obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; + obj.handle = dup(fd); + obj.cookie = (void*)1; + return writeObject(obj, true); +} + +status_t Parcel::writeObject(const flat_binder_object& val, bool nullMetaData) +{ + const bool enoughData = (mDataPos+sizeof(val)) <= mDataCapacity; + const bool enoughObjects = mObjectsSize < mObjectsCapacity; + if (enoughData && enoughObjects) { +restart_write: + *reinterpret_cast<flat_binder_object*>(mData+mDataPos) = val; + + // Need to write meta-data? + if (nullMetaData || val.binder != NULL) { + mObjects[mObjectsSize] = mDataPos; + acquire_object(ProcessState::self(), val, this); + mObjectsSize++; + } + + // remember if it's a file descriptor + if (val.type == BINDER_TYPE_FD) { + mHasFds = mFdsKnown = true; + } + + return finishWrite(sizeof(flat_binder_object)); + } + + if (!enoughData) { + const status_t err = growData(sizeof(val)); + if (err != NO_ERROR) return err; + } + if (!enoughObjects) { + size_t newSize = ((mObjectsSize+2)*3)/2; + size_t* objects = (size_t*)realloc(mObjects, newSize*sizeof(size_t)); + if (objects == NULL) return NO_MEMORY; + mObjects = objects; + mObjectsCapacity = newSize; + } + + goto restart_write; +} + + +void Parcel::remove(size_t start, size_t amt) +{ + LOG_ALWAYS_FATAL("Parcel::remove() not yet implemented!"); +} + +status_t Parcel::read(void* outData, size_t len) const +{ + if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize) { + memcpy(outData, mData+mDataPos, len); + mDataPos += PAD_SIZE(len); + LOGV("read Setting data pos of %p to %d\n", this, mDataPos); + return NO_ERROR; + } + return NOT_ENOUGH_DATA; +} + +const void* Parcel::readInplace(size_t len) const +{ + if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize) { + const void* data = mData+mDataPos; + mDataPos += PAD_SIZE(len); + LOGV("readInplace Setting data pos of %p to %d\n", this, mDataPos); + return data; + } + return NULL; +} + +template<class T> +status_t Parcel::readAligned(T *pArg) const { + COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE(sizeof(T)) == sizeof(T)); + + if ((mDataPos+sizeof(T)) <= mDataSize) { + const void* data = mData+mDataPos; + mDataPos += sizeof(T); + *pArg = *reinterpret_cast<const T*>(data); + return NO_ERROR; + } else { + return NOT_ENOUGH_DATA; + } +} + +template<class T> +T Parcel::readAligned() const { + T result; + if (readAligned(&result) != NO_ERROR) { + result = 0; + } + + return result; +} + +template<class T> +status_t Parcel::writeAligned(T val) { + COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE(sizeof(T)) == sizeof(T)); + + if ((mDataPos+sizeof(val)) <= mDataCapacity) { +restart_write: + *reinterpret_cast<T*>(mData+mDataPos) = val; + return finishWrite(sizeof(val)); + } + + status_t err = growData(sizeof(val)); + if (err == NO_ERROR) goto restart_write; + return err; +} + +status_t Parcel::readInt32(int32_t *pArg) const +{ + return readAligned(pArg); +} + +int32_t Parcel::readInt32() const +{ + return readAligned<int32_t>(); +} + + +status_t Parcel::readInt64(int64_t *pArg) const +{ + return readAligned(pArg); +} + + +int64_t Parcel::readInt64() const +{ + return readAligned<int64_t>(); +} + +status_t Parcel::readFloat(float *pArg) const +{ + return readAligned(pArg); +} + + +float Parcel::readFloat() const +{ + return readAligned<float>(); +} + +status_t Parcel::readDouble(double *pArg) const +{ + return readAligned(pArg); +} + + +double Parcel::readDouble() const +{ + return readAligned<double>(); +} + +status_t Parcel::readIntPtr(intptr_t *pArg) const +{ + return readAligned(pArg); +} + + +intptr_t Parcel::readIntPtr() const +{ + return readAligned<intptr_t>(); +} + + +const char* Parcel::readCString() const +{ + const size_t avail = mDataSize-mDataPos; + if (avail > 0) { + const char* str = reinterpret_cast<const char*>(mData+mDataPos); + // is the string's trailing NUL within the parcel's valid bounds? + const char* eos = reinterpret_cast<const char*>(memchr(str, 0, avail)); + if (eos) { + const size_t len = eos - str; + mDataPos += PAD_SIZE(len+1); + LOGV("readCString Setting data pos of %p to %d\n", this, mDataPos); + return str; + } + } + return NULL; +} + +String8 Parcel::readString8() const +{ + int32_t size = readInt32(); + // watch for potential int overflow adding 1 for trailing NUL + if (size > 0 && size < INT32_MAX) { + const char* str = (const char*)readInplace(size+1); + if (str) return String8(str, size); + } + return String8(); +} + +String16 Parcel::readString16() const +{ + size_t len; + const char16_t* str = readString16Inplace(&len); + if (str) return String16(str, len); + LOGE("Reading a NULL string not supported here."); + return String16(); +} + +const char16_t* Parcel::readString16Inplace(size_t* outLen) const +{ + int32_t size = readInt32(); + // watch for potential int overflow from size+1 + if (size >= 0 && size < INT32_MAX) { + *outLen = size; + const char16_t* str = (const char16_t*)readInplace((size+1)*sizeof(char16_t)); + if (str != NULL) { + return str; + } + } + *outLen = 0; + return NULL; +} + +sp<IBinder> Parcel::readStrongBinder() const +{ + sp<IBinder> val; + unflatten_binder(ProcessState::self(), *this, &val); + return val; +} + +wp<IBinder> Parcel::readWeakBinder() const +{ + wp<IBinder> val; + unflatten_binder(ProcessState::self(), *this, &val); + return val; +} + + +native_handle* Parcel::readNativeHandle() const +{ + int numFds, numInts; + status_t err; + err = readInt32(&numFds); + if (err != NO_ERROR) return 0; + err = readInt32(&numInts); + if (err != NO_ERROR) return 0; + + native_handle* h = native_handle_create(numFds, numInts); + for (int i=0 ; err==NO_ERROR && i<numFds ; i++) { + h->data[i] = dup(readFileDescriptor()); + if (h->data[i] < 0) err = BAD_VALUE; + } + err = read(h->data + numFds, sizeof(int)*numInts); + if (err != NO_ERROR) { + native_handle_close(h); + native_handle_delete(h); + h = 0; + } + return h; +} + + +int Parcel::readFileDescriptor() const +{ + const flat_binder_object* flat = readObject(true); + if (flat) { + switch (flat->type) { + case BINDER_TYPE_FD: + //LOGI("Returning file descriptor %ld from parcel %p\n", flat->handle, this); + return flat->handle; + } + } + return BAD_TYPE; +} + +const flat_binder_object* Parcel::readObject(bool nullMetaData) const +{ + const size_t DPOS = mDataPos; + if ((DPOS+sizeof(flat_binder_object)) <= mDataSize) { + const flat_binder_object* obj + = reinterpret_cast<const flat_binder_object*>(mData+DPOS); + mDataPos = DPOS + sizeof(flat_binder_object); + if (!nullMetaData && (obj->cookie == NULL && obj->binder == NULL)) { + // When transferring a NULL object, we don't write it into + // the object list, so we don't want to check for it when + // reading. + LOGV("readObject Setting data pos of %p to %d\n", this, mDataPos); + return obj; + } + + // Ensure that this object is valid... + size_t* const OBJS = mObjects; + const size_t N = mObjectsSize; + size_t opos = mNextObjectHint; + + if (N > 0) { + LOGV("Parcel %p looking for obj at %d, hint=%d\n", + this, DPOS, opos); + + // Start at the current hint position, looking for an object at + // the current data position. + if (opos < N) { + while (opos < (N-1) && OBJS[opos] < DPOS) { + opos++; + } + } else { + opos = N-1; + } + if (OBJS[opos] == DPOS) { + // Found it! + LOGV("Parcel found obj %d at index %d with forward search", + this, DPOS, opos); + mNextObjectHint = opos+1; + LOGV("readObject Setting data pos of %p to %d\n", this, mDataPos); + return obj; + } + + // Look backwards for it... + while (opos > 0 && OBJS[opos] > DPOS) { + opos--; + } + if (OBJS[opos] == DPOS) { + // Found it! + LOGV("Parcel found obj %d at index %d with backward search", + this, DPOS, opos); + mNextObjectHint = opos+1; + LOGV("readObject Setting data pos of %p to %d\n", this, mDataPos); + return obj; + } + } + LOGW("Attempt to read object from Parcel %p at offset %d that is not in the object list", + this, DPOS); + } + return NULL; +} + +void Parcel::closeFileDescriptors() +{ + size_t i = mObjectsSize; + if (i > 0) { + //LOGI("Closing file descriptors for %d objects...", mObjectsSize); + } + while (i > 0) { + i--; + const flat_binder_object* flat + = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]); + if (flat->type == BINDER_TYPE_FD) { + //LOGI("Closing fd: %ld\n", flat->handle); + close(flat->handle); + } + } +} + +const uint8_t* Parcel::ipcData() const +{ + return mData; +} + +size_t Parcel::ipcDataSize() const +{ + return (mDataSize > mDataPos ? mDataSize : mDataPos); +} + +const size_t* Parcel::ipcObjects() const +{ + return mObjects; +} + +size_t Parcel::ipcObjectsCount() const +{ + return mObjectsSize; +} + +void Parcel::ipcSetDataReference(const uint8_t* data, size_t dataSize, + const size_t* objects, size_t objectsCount, release_func relFunc, void* relCookie) +{ + freeDataNoInit(); + mError = NO_ERROR; + mData = const_cast<uint8_t*>(data); + mDataSize = mDataCapacity = dataSize; + //LOGI("setDataReference Setting data size of %p to %lu (pid=%d)\n", this, mDataSize, getpid()); + mDataPos = 0; + LOGV("setDataReference Setting data pos of %p to %d\n", this, mDataPos); + mObjects = const_cast<size_t*>(objects); + mObjectsSize = mObjectsCapacity = objectsCount; + mNextObjectHint = 0; + mOwner = relFunc; + mOwnerCookie = relCookie; + scanForFds(); +} + +void Parcel::print(TextOutput& to, uint32_t flags) const +{ + to << "Parcel("; + + if (errorCheck() != NO_ERROR) { + const status_t err = errorCheck(); + to << "Error: " << (void*)err << " \"" << strerror(-err) << "\""; + } else if (dataSize() > 0) { + const uint8_t* DATA = data(); + to << indent << HexDump(DATA, dataSize()) << dedent; + const size_t* OBJS = objects(); + const size_t N = objectsCount(); + for (size_t i=0; i<N; i++) { + const flat_binder_object* flat + = reinterpret_cast<const flat_binder_object*>(DATA+OBJS[i]); + to << endl << "Object #" << i << " @ " << (void*)OBJS[i] << ": " + << TypeCode(flat->type & 0x7f7f7f00) + << " = " << flat->binder; + } + } else { + to << "NULL"; + } + + to << ")"; +} + +void Parcel::releaseObjects() +{ + const sp<ProcessState> proc(ProcessState::self()); + size_t i = mObjectsSize; + uint8_t* const data = mData; + size_t* const objects = mObjects; + while (i > 0) { + i--; + const flat_binder_object* flat + = reinterpret_cast<flat_binder_object*>(data+objects[i]); + release_object(proc, *flat, this); + } +} + +void Parcel::acquireObjects() +{ + const sp<ProcessState> proc(ProcessState::self()); + size_t i = mObjectsSize; + uint8_t* const data = mData; + size_t* const objects = mObjects; + while (i > 0) { + i--; + const flat_binder_object* flat + = reinterpret_cast<flat_binder_object*>(data+objects[i]); + acquire_object(proc, *flat, this); + } +} + +void Parcel::freeData() +{ + freeDataNoInit(); + initState(); +} + +void Parcel::freeDataNoInit() +{ + if (mOwner) { + //LOGI("Freeing data ref of %p (pid=%d)\n", this, getpid()); + mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie); + } else { + releaseObjects(); + if (mData) free(mData); + if (mObjects) free(mObjects); + } +} + +status_t Parcel::growData(size_t len) +{ + size_t newSize = ((mDataSize+len)*3)/2; + return (newSize <= mDataSize) + ? (status_t) NO_MEMORY + : continueWrite(newSize); +} + +status_t Parcel::restartWrite(size_t desired) +{ + if (mOwner) { + freeData(); + return continueWrite(desired); + } + + uint8_t* data = (uint8_t*)realloc(mData, desired); + if (!data && desired > mDataCapacity) { + mError = NO_MEMORY; + return NO_MEMORY; + } + + releaseObjects(); + + if (data) { + mData = data; + mDataCapacity = desired; + } + + mDataSize = mDataPos = 0; + LOGV("restartWrite Setting data size of %p to %d\n", this, mDataSize); + LOGV("restartWrite Setting data pos of %p to %d\n", this, mDataPos); + + free(mObjects); + mObjects = NULL; + mObjectsSize = mObjectsCapacity = 0; + mNextObjectHint = 0; + mHasFds = false; + mFdsKnown = true; + + return NO_ERROR; +} + +status_t Parcel::continueWrite(size_t desired) +{ + // If shrinking, first adjust for any objects that appear + // after the new data size. + size_t objectsSize = mObjectsSize; + if (desired < mDataSize) { + if (desired == 0) { + objectsSize = 0; + } else { + while (objectsSize > 0) { + if (mObjects[objectsSize-1] < desired) + break; + objectsSize--; + } + } + } + + if (mOwner) { + // If the size is going to zero, just release the owner's data. + if (desired == 0) { + freeData(); + return NO_ERROR; + } + + // If there is a different owner, we need to take + // posession. + uint8_t* data = (uint8_t*)malloc(desired); + if (!data) { + mError = NO_MEMORY; + return NO_MEMORY; + } + size_t* objects = NULL; + + if (objectsSize) { + objects = (size_t*)malloc(objectsSize*sizeof(size_t)); + if (!objects) { + mError = NO_MEMORY; + return NO_MEMORY; + } + + // Little hack to only acquire references on objects + // we will be keeping. + size_t oldObjectsSize = mObjectsSize; + mObjectsSize = objectsSize; + acquireObjects(); + mObjectsSize = oldObjectsSize; + } + + if (mData) { + memcpy(data, mData, mDataSize < desired ? mDataSize : desired); + } + if (objects && mObjects) { + memcpy(objects, mObjects, objectsSize*sizeof(size_t)); + } + //LOGI("Freeing data ref of %p (pid=%d)\n", this, getpid()); + mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie); + mOwner = NULL; + + mData = data; + mObjects = objects; + mDataSize = (mDataSize < desired) ? mDataSize : desired; + LOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize); + mDataCapacity = desired; + mObjectsSize = mObjectsCapacity = objectsSize; + mNextObjectHint = 0; + + } else if (mData) { + if (objectsSize < mObjectsSize) { + // Need to release refs on any objects we are dropping. + const sp<ProcessState> proc(ProcessState::self()); + for (size_t i=objectsSize; i<mObjectsSize; i++) { + const flat_binder_object* flat + = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]); + if (flat->type == BINDER_TYPE_FD) { + // will need to rescan because we may have lopped off the only FDs + mFdsKnown = false; + } + release_object(proc, *flat, this); + } + size_t* objects = + (size_t*)realloc(mObjects, objectsSize*sizeof(size_t)); + if (objects) { + mObjects = objects; + } + mObjectsSize = objectsSize; + mNextObjectHint = 0; + } + + // We own the data, so we can just do a realloc(). + if (desired > mDataCapacity) { + uint8_t* data = (uint8_t*)realloc(mData, desired); + if (data) { + mData = data; + mDataCapacity = desired; + } else if (desired > mDataCapacity) { + mError = NO_MEMORY; + return NO_MEMORY; + } + } else { + mDataSize = desired; + LOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize); + if (mDataPos > desired) { + mDataPos = desired; + LOGV("continueWrite Setting data pos of %p to %d\n", this, mDataPos); + } + } + + } else { + // This is the first data. Easy! + uint8_t* data = (uint8_t*)malloc(desired); + if (!data) { + mError = NO_MEMORY; + return NO_MEMORY; + } + + if(!(mDataCapacity == 0 && mObjects == NULL + && mObjectsCapacity == 0)) { + LOGE("continueWrite: %d/%p/%d/%d", mDataCapacity, mObjects, mObjectsCapacity, desired); + } + + mData = data; + mDataSize = mDataPos = 0; + LOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize); + LOGV("continueWrite Setting data pos of %p to %d\n", this, mDataPos); + mDataCapacity = desired; + } + + return NO_ERROR; +} + +void Parcel::initState() +{ + mError = NO_ERROR; + mData = 0; + mDataSize = 0; + mDataCapacity = 0; + mDataPos = 0; + LOGV("initState Setting data size of %p to %d\n", this, mDataSize); + LOGV("initState Setting data pos of %p to %d\n", this, mDataPos); + mObjects = NULL; + mObjectsSize = 0; + mObjectsCapacity = 0; + mNextObjectHint = 0; + mHasFds = false; + mFdsKnown = true; + mOwner = NULL; +} + +void Parcel::scanForFds() const +{ + bool hasFds = false; + for (size_t i=0; i<mObjectsSize; i++) { + const flat_binder_object* flat + = reinterpret_cast<const flat_binder_object*>(mData + mObjects[i]); + if (flat->type == BINDER_TYPE_FD) { + hasFds = true; + break; + } + } + mHasFds = hasFds; + mFdsKnown = true; +} + +}; // namespace android |