Parcel.cpp revision 6790329358d1c84af2fe9ba093bcfc1c6176e758
1326e0ddf89e8df2837752fbfd7a014814b32082cJason Sams/* 2a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk * Copyright (C) 2005 The Android Open Source Project 3326e0ddf89e8df2837752fbfd7a014814b32082cJason Sams * 4326e0ddf89e8df2837752fbfd7a014814b32082cJason Sams * Licensed under the Apache License, Version 2.0 (the "License"); 5326e0ddf89e8df2837752fbfd7a014814b32082cJason Sams * you may not use this file except in compliance with the License. 6326e0ddf89e8df2837752fbfd7a014814b32082cJason Sams * You may obtain a copy of the License at 7326e0ddf89e8df2837752fbfd7a014814b32082cJason Sams * 8326e0ddf89e8df2837752fbfd7a014814b32082cJason Sams * http://www.apache.org/licenses/LICENSE-2.0 9326e0ddf89e8df2837752fbfd7a014814b32082cJason Sams * 10326e0ddf89e8df2837752fbfd7a014814b32082cJason Sams * Unless required by applicable law or agreed to in writing, software 11326e0ddf89e8df2837752fbfd7a014814b32082cJason Sams * distributed under the License is distributed on an "AS IS" BASIS, 12326e0ddf89e8df2837752fbfd7a014814b32082cJason Sams * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13326e0ddf89e8df2837752fbfd7a014814b32082cJason Sams * See the License for the specific language governing permissions and 14326e0ddf89e8df2837752fbfd7a014814b32082cJason Sams * limitations under the License. 15326e0ddf89e8df2837752fbfd7a014814b32082cJason Sams */ 16326e0ddf89e8df2837752fbfd7a014814b32082cJason Sams 17326e0ddf89e8df2837752fbfd7a014814b32082cJason Sams#define LOG_TAG "Parcel" 18fb6b614bcea88a587a7ea4530be45ff0ffa0210eAlex Sakhartchouk//#define LOG_NDEBUG 0 19c460e55d78cbe8bee95c5c947dfe541218142a5bJason Sams 20326e0ddf89e8df2837752fbfd7a014814b32082cJason Sams#include <binder/Parcel.h> 21326e0ddf89e8df2837752fbfd7a014814b32082cJason Sams 22326e0ddf89e8df2837752fbfd7a014814b32082cJason Sams#include <binder/IPCThreadState.h> 23afb743aca56c18beb7ab924e75cb6e070ef3e55aAlex Sakhartchouk#include <binder/Binder.h> 2454929cce0bf44090424b1f91b676529a2422378fAlex Sakhartchouk#include <binder/BpBinder.h> 254815c0d121310cfcd6a8aba4eab77a9910af53acJason Sams#include <binder/ProcessState.h> 264815c0d121310cfcd6a8aba4eab77a9910af53acJason Sams#include <binder/TextOutput.h> 274815c0d121310cfcd6a8aba4eab77a9910af53acJason Sams 28afb743aca56c18beb7ab924e75cb6e070ef3e55aAlex Sakhartchouk#include <utils/Debug.h> 29afb743aca56c18beb7ab924e75cb6e070ef3e55aAlex Sakhartchouk#include <utils/Log.h> 304815c0d121310cfcd6a8aba4eab77a9910af53acJason Sams#include <utils/String8.h> 31afb743aca56c18beb7ab924e75cb6e070ef3e55aAlex Sakhartchouk#include <utils/String16.h> 324815c0d121310cfcd6a8aba4eab77a9910af53acJason Sams#include <utils/misc.h> 334815c0d121310cfcd6a8aba4eab77a9910af53acJason Sams#include <utils/Flattenable.h> 34a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk#include <cutils/ashmem.h> 354815c0d121310cfcd6a8aba4eab77a9910af53acJason Sams 364815c0d121310cfcd6a8aba4eab77a9910af53acJason Sams#include <private/binder/binder_module.h> 37a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk 384815c0d121310cfcd6a8aba4eab77a9910af53acJason Sams#include <inttypes.h> 3984e4027f83b20af59f5b1fc52be6e45f159d3970Alex Sakhartchouk#include <stdio.h> 40a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk#include <stdlib.h> 41f2e4fa215c420cf0f8d226e9a59acb1f312e5e40Jason Sams#include <stdint.h> 424815c0d121310cfcd6a8aba4eab77a9910af53acJason Sams#include <sys/mman.h> 434815c0d121310cfcd6a8aba4eab77a9910af53acJason Sams 44a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk#ifndef INT32_MAX 45a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk#define INT32_MAX ((int32_t)(2147483647)) 46a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk#endif 47a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk 48a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk#define LOG_REFS(...) 49a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk//#define LOG_REFS(...) ALOG(LOG_DEBUG, "Parcel", __VA_ARGS__) 504815c0d121310cfcd6a8aba4eab77a9910af53acJason Sams 514815c0d121310cfcd6a8aba4eab77a9910af53acJason Sams// --------------------------------------------------------------------------- 524815c0d121310cfcd6a8aba4eab77a9910af53acJason Sams 534815c0d121310cfcd6a8aba4eab77a9910af53acJason Sams#define PAD_SIZE(s) (((s)+3)&~3) 5484e4027f83b20af59f5b1fc52be6e45f159d3970Alex Sakhartchouk 554815c0d121310cfcd6a8aba4eab77a9910af53acJason Sams// Note: must be kept in sync with android/os/StrictMode.java's PENALTY_GATHER 564815c0d121310cfcd6a8aba4eab77a9910af53acJason Sams#define STRICT_MODE_PENALTY_GATHER 0x100 57a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk 584815c0d121310cfcd6a8aba4eab77a9910af53acJason Sams// Note: must be kept in sync with android/os/Parcel.java's EX_HAS_REPLY_HEADER 594815c0d121310cfcd6a8aba4eab77a9910af53acJason Sams#define EX_HAS_REPLY_HEADER -128 60a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk 614815c0d121310cfcd6a8aba4eab77a9910af53acJason Sams// Maximum size of a blob to transfer in-place. 6284e4027f83b20af59f5b1fc52be6e45f159d3970Alex Sakhartchoukstatic const size_t IN_PLACE_BLOB_LIMIT = 40 * 1024; 63a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk 6484e4027f83b20af59f5b1fc52be6e45f159d3970Alex Sakhartchouk// XXX This can be made public if we want to provide 654815c0d121310cfcd6a8aba4eab77a9910af53acJason Sams// support for typed data. 66e7ae69f4a70f1813cf8086ebd9714192c635300aAlex Sakhartchoukstruct small_flat_data 67e7ae69f4a70f1813cf8086ebd9714192c635300aAlex Sakhartchouk{ 68afb743aca56c18beb7ab924e75cb6e070ef3e55aAlex Sakhartchouk uint32_t type; 69e7ae69f4a70f1813cf8086ebd9714192c635300aAlex Sakhartchouk uint32_t data; 70e7ae69f4a70f1813cf8086ebd9714192c635300aAlex Sakhartchouk}; 71e7ae69f4a70f1813cf8086ebd9714192c635300aAlex Sakhartchouk 72e7ae69f4a70f1813cf8086ebd9714192c635300aAlex Sakhartchouknamespace android { 73e7ae69f4a70f1813cf8086ebd9714192c635300aAlex Sakhartchouk 744815c0d121310cfcd6a8aba4eab77a9910af53acJason Samsvoid acquire_object(const sp<ProcessState>& proc, 75326e0ddf89e8df2837752fbfd7a014814b32082cJason Sams const flat_binder_object& obj, const void* who) 76326e0ddf89e8df2837752fbfd7a014814b32082cJason Sams{ 77afb743aca56c18beb7ab924e75cb6e070ef3e55aAlex Sakhartchouk switch (obj.type) { 78889fe50e7aaebed8cb8284b16a0e51e64e8a3a9cAlex Sakhartchouk case BINDER_TYPE_BINDER: 79a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk if (obj.binder) { 80383e5b1f68c321a77bfd7466fa1171a9bfab4a6fAlex Sakhartchouk LOG_REFS("Parcel %p acquiring reference on local %p", who, obj.cookie); 819ebb0c44ece47531f3d0a98ba52ae448de42032bJason Sams static_cast<IBinder*>(obj.cookie)->incStrong(who); 824815c0d121310cfcd6a8aba4eab77a9910af53acJason Sams } 83a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk return; 84383e5b1f68c321a77bfd7466fa1171a9bfab4a6fAlex Sakhartchouk case BINDER_TYPE_WEAK_BINDER: 85383e5b1f68c321a77bfd7466fa1171a9bfab4a6fAlex Sakhartchouk if (obj.binder) 86383e5b1f68c321a77bfd7466fa1171a9bfab4a6fAlex Sakhartchouk static_cast<RefBase::weakref_type*>(obj.binder)->incWeak(who); 87a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk return; 88a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk case BINDER_TYPE_HANDLE: { 89a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle); 90a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk if (b != NULL) { 91a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk LOG_REFS("Parcel %p acquiring reference on remote %p", who, b.get()); 92a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk b->incStrong(who); 93a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk } 94a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk return; 95a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk } 96326e0ddf89e8df2837752fbfd7a014814b32082cJason Sams case BINDER_TYPE_WEAK_HANDLE: { 97326e0ddf89e8df2837752fbfd7a014814b32082cJason Sams const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle); 9854929cce0bf44090424b1f91b676529a2422378fAlex Sakhartchouk if (b != NULL) b.get_refs()->incWeak(who); 9954929cce0bf44090424b1f91b676529a2422378fAlex Sakhartchouk return; 10054929cce0bf44090424b1f91b676529a2422378fAlex Sakhartchouk } 101a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk case BINDER_TYPE_FD: { 102a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk // intentionally blank -- nothing to do to acquire this, but we do 103a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk // recognize it as a legitimate object type. 104a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk return; 105a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk } 106a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk } 107a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk 108a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk ALOGD("Invalid object type 0x%08lx", obj.type); 109a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk} 110a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk 111a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchoukvoid release_object(const sp<ProcessState>& proc, 112a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk const flat_binder_object& obj, const void* who) 11354929cce0bf44090424b1f91b676529a2422378fAlex Sakhartchouk{ 11454929cce0bf44090424b1f91b676529a2422378fAlex Sakhartchouk switch (obj.type) { 115326e0ddf89e8df2837752fbfd7a014814b32082cJason Sams case BINDER_TYPE_BINDER: 116afb743aca56c18beb7ab924e75cb6e070ef3e55aAlex Sakhartchouk if (obj.binder) { 117383e5b1f68c321a77bfd7466fa1171a9bfab4a6fAlex Sakhartchouk LOG_REFS("Parcel %p releasing reference on local %p", who, obj.cookie); 118a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk static_cast<IBinder*>(obj.cookie)->decStrong(who); 119383e5b1f68c321a77bfd7466fa1171a9bfab4a6fAlex Sakhartchouk } 120a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk return; 121383e5b1f68c321a77bfd7466fa1171a9bfab4a6fAlex Sakhartchouk case BINDER_TYPE_WEAK_BINDER: 122383e5b1f68c321a77bfd7466fa1171a9bfab4a6fAlex Sakhartchouk if (obj.binder) 123383e5b1f68c321a77bfd7466fa1171a9bfab4a6fAlex Sakhartchouk static_cast<RefBase::weakref_type*>(obj.binder)->decWeak(who); 124a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk return; 125383e5b1f68c321a77bfd7466fa1171a9bfab4a6fAlex Sakhartchouk case BINDER_TYPE_HANDLE: { 126383e5b1f68c321a77bfd7466fa1171a9bfab4a6fAlex Sakhartchouk const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle); 127383e5b1f68c321a77bfd7466fa1171a9bfab4a6fAlex Sakhartchouk if (b != NULL) { 128383e5b1f68c321a77bfd7466fa1171a9bfab4a6fAlex Sakhartchouk LOG_REFS("Parcel %p releasing reference on remote %p", who, b.get()); 129383e5b1f68c321a77bfd7466fa1171a9bfab4a6fAlex Sakhartchouk b->decStrong(who); 130383e5b1f68c321a77bfd7466fa1171a9bfab4a6fAlex Sakhartchouk } 131a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk return; 1325c3e3bc8af6de6be5e6bd68e1d5168496f99e6cfJason Sams } 1335c3e3bc8af6de6be5e6bd68e1d5168496f99e6cfJason Sams case BINDER_TYPE_WEAK_HANDLE: { 134a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle); 135a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk if (b != NULL) b.get_refs()->decWeak(who); 1365c3e3bc8af6de6be5e6bd68e1d5168496f99e6cfJason Sams return; 137a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk } 1385c3e3bc8af6de6be5e6bd68e1d5168496f99e6cfJason Sams case BINDER_TYPE_FD: { 1395c3e3bc8af6de6be5e6bd68e1d5168496f99e6cfJason Sams if (obj.cookie != (void*)0) close(obj.handle); 1405c3e3bc8af6de6be5e6bd68e1d5168496f99e6cfJason Sams return; 141326e0ddf89e8df2837752fbfd7a014814b32082cJason Sams } 142326e0ddf89e8df2837752fbfd7a014814b32082cJason Sams } 143326e0ddf89e8df2837752fbfd7a014814b32082cJason Sams 144afb743aca56c18beb7ab924e75cb6e070ef3e55aAlex Sakhartchouk ALOGE("Invalid object type 0x%08lx", obj.type); 145a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk} 146a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk 147383e5b1f68c321a77bfd7466fa1171a9bfab4a6fAlex Sakhartchoukinline static status_t finish_flatten_binder( 1487dad9c30a59c99b57269e1b498807b6f034d56e9Jason Sams const sp<IBinder>& binder, const flat_binder_object& flat, Parcel* out) 1497dad9c30a59c99b57269e1b498807b6f034d56e9Jason Sams{ 1507dad9c30a59c99b57269e1b498807b6f034d56e9Jason Sams return out->writeObject(flat, false); 151a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk} 15284e4027f83b20af59f5b1fc52be6e45f159d3970Alex Sakhartchouk 15384e4027f83b20af59f5b1fc52be6e45f159d3970Alex Sakhartchoukstatus_t flatten_binder(const sp<ProcessState>& proc, 15484e4027f83b20af59f5b1fc52be6e45f159d3970Alex Sakhartchouk const sp<IBinder>& binder, Parcel* out) 15584e4027f83b20af59f5b1fc52be6e45f159d3970Alex Sakhartchouk{ 15684e4027f83b20af59f5b1fc52be6e45f159d3970Alex Sakhartchouk flat_binder_object obj; 1577dad9c30a59c99b57269e1b498807b6f034d56e9Jason Sams 158a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 1597dad9c30a59c99b57269e1b498807b6f034d56e9Jason Sams if (binder != NULL) { 1607dad9c30a59c99b57269e1b498807b6f034d56e9Jason Sams IBinder *local = binder->localBinder(); 1617dad9c30a59c99b57269e1b498807b6f034d56e9Jason Sams if (!local) { 162afb743aca56c18beb7ab924e75cb6e070ef3e55aAlex Sakhartchouk BpBinder *proxy = binder->remoteBinder(); 163a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk if (proxy == NULL) { 164a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk ALOGE("null proxy"); 165383e5b1f68c321a77bfd7466fa1171a9bfab4a6fAlex Sakhartchouk } 1667dad9c30a59c99b57269e1b498807b6f034d56e9Jason Sams const int32_t handle = proxy ? proxy->handle() : 0; 1677dad9c30a59c99b57269e1b498807b6f034d56e9Jason Sams obj.type = BINDER_TYPE_HANDLE; 1687dad9c30a59c99b57269e1b498807b6f034d56e9Jason Sams obj.handle = handle; 169a04e30dbb5ab11592b03666bb3d102070759c58eAlex Sakhartchouk obj.cookie = NULL; 1707dad9c30a59c99b57269e1b498807b6f034d56e9Jason Sams } else { 1717dad9c30a59c99b57269e1b498807b6f034d56e9Jason Sams obj.type = BINDER_TYPE_BINDER; 1727dad9c30a59c99b57269e1b498807b6f034d56e9Jason Sams obj.binder = local->getWeakRefs(); 173afb743aca56c18beb7ab924e75cb6e070ef3e55aAlex Sakhartchouk obj.cookie = local; 174f2a5d7326b38e5a28b6618f9b1e5a021aef7179fJason Sams } 175f2a5d7326b38e5a28b6618f9b1e5a021aef7179fJason Sams } else { 176f2a5d7326b38e5a28b6618f9b1e5a021aef7179fJason Sams obj.type = BINDER_TYPE_BINDER; 1774815c0d121310cfcd6a8aba4eab77a9910af53acJason Sams obj.binder = NULL; 1784815c0d121310cfcd6a8aba4eab77a9910af53acJason Sams obj.cookie = NULL; 1794815c0d121310cfcd6a8aba4eab77a9910af53acJason Sams } 180afb743aca56c18beb7ab924e75cb6e070ef3e55aAlex Sakhartchouk 1814815c0d121310cfcd6a8aba4eab77a9910af53acJason Sams return finish_flatten_binder(binder, obj, out); 182383e5b1f68c321a77bfd7466fa1171a9bfab4a6fAlex Sakhartchouk} 1834815c0d121310cfcd6a8aba4eab77a9910af53acJason Sams 1844815c0d121310cfcd6a8aba4eab77a9910af53acJason Samsstatus_t flatten_binder(const sp<ProcessState>& proc, 185afb743aca56c18beb7ab924e75cb6e070ef3e55aAlex Sakhartchouk const wp<IBinder>& binder, Parcel* out) 1867dad9c30a59c99b57269e1b498807b6f034d56e9Jason Sams{ 187383e5b1f68c321a77bfd7466fa1171a9bfab4a6fAlex Sakhartchouk flat_binder_object obj; 1887dad9c30a59c99b57269e1b498807b6f034d56e9Jason Sams 1897dad9c30a59c99b57269e1b498807b6f034d56e9Jason Sams obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 190afb743aca56c18beb7ab924e75cb6e070ef3e55aAlex Sakhartchouk if (binder != NULL) { 1917dad9c30a59c99b57269e1b498807b6f034d56e9Jason Sams sp<IBinder> real = binder.promote(); 192383e5b1f68c321a77bfd7466fa1171a9bfab4a6fAlex Sakhartchouk if (real != NULL) { 1937dad9c30a59c99b57269e1b498807b6f034d56e9Jason Sams IBinder *local = real->localBinder(); 1944815c0d121310cfcd6a8aba4eab77a9910af53acJason Sams if (!local) { 1954815c0d121310cfcd6a8aba4eab77a9910af53acJason Sams BpBinder *proxy = real->remoteBinder(); 1964815c0d121310cfcd6a8aba4eab77a9910af53acJason Sams if (proxy == NULL) { 1974815c0d121310cfcd6a8aba4eab77a9910af53acJason Sams ALOGE("null proxy"); 198 } 199 const int32_t handle = proxy ? proxy->handle() : 0; 200 obj.type = BINDER_TYPE_WEAK_HANDLE; 201 obj.handle = handle; 202 obj.cookie = NULL; 203 } else { 204 obj.type = BINDER_TYPE_WEAK_BINDER; 205 obj.binder = binder.get_refs(); 206 obj.cookie = binder.unsafe_get(); 207 } 208 return finish_flatten_binder(real, obj, out); 209 } 210 211 // XXX How to deal? In order to flatten the given binder, 212 // we need to probe it for information, which requires a primary 213 // reference... but we don't have one. 214 // 215 // The OpenBinder implementation uses a dynamic_cast<> here, 216 // but we can't do that with the different reference counting 217 // implementation we are using. 218 ALOGE("Unable to unflatten Binder weak reference!"); 219 obj.type = BINDER_TYPE_BINDER; 220 obj.binder = NULL; 221 obj.cookie = NULL; 222 return finish_flatten_binder(NULL, obj, out); 223 224 } else { 225 obj.type = BINDER_TYPE_BINDER; 226 obj.binder = NULL; 227 obj.cookie = NULL; 228 return finish_flatten_binder(NULL, obj, out); 229 } 230} 231 232inline static status_t finish_unflatten_binder( 233 BpBinder* proxy, const flat_binder_object& flat, const Parcel& in) 234{ 235 return NO_ERROR; 236} 237 238status_t unflatten_binder(const sp<ProcessState>& proc, 239 const Parcel& in, sp<IBinder>* out) 240{ 241 const flat_binder_object* flat = in.readObject(false); 242 243 if (flat) { 244 switch (flat->type) { 245 case BINDER_TYPE_BINDER: 246 *out = static_cast<IBinder*>(flat->cookie); 247 return finish_unflatten_binder(NULL, *flat, in); 248 case BINDER_TYPE_HANDLE: 249 *out = proc->getStrongProxyForHandle(flat->handle); 250 return finish_unflatten_binder( 251 static_cast<BpBinder*>(out->get()), *flat, in); 252 } 253 } 254 return BAD_TYPE; 255} 256 257status_t unflatten_binder(const sp<ProcessState>& proc, 258 const Parcel& in, wp<IBinder>* out) 259{ 260 const flat_binder_object* flat = in.readObject(false); 261 262 if (flat) { 263 switch (flat->type) { 264 case BINDER_TYPE_BINDER: 265 *out = static_cast<IBinder*>(flat->cookie); 266 return finish_unflatten_binder(NULL, *flat, in); 267 case BINDER_TYPE_WEAK_BINDER: 268 if (flat->binder != NULL) { 269 out->set_object_and_refs( 270 static_cast<IBinder*>(flat->cookie), 271 static_cast<RefBase::weakref_type*>(flat->binder)); 272 } else { 273 *out = NULL; 274 } 275 return finish_unflatten_binder(NULL, *flat, in); 276 case BINDER_TYPE_HANDLE: 277 case BINDER_TYPE_WEAK_HANDLE: 278 *out = proc->getWeakProxyForHandle(flat->handle); 279 return finish_unflatten_binder( 280 static_cast<BpBinder*>(out->unsafe_get()), *flat, in); 281 } 282 } 283 return BAD_TYPE; 284} 285 286// --------------------------------------------------------------------------- 287 288Parcel::Parcel() 289{ 290 initState(); 291} 292 293Parcel::~Parcel() 294{ 295 freeDataNoInit(); 296} 297 298const uint8_t* Parcel::data() const 299{ 300 return mData; 301} 302 303size_t Parcel::dataSize() const 304{ 305 return (mDataSize > mDataPos ? mDataSize : mDataPos); 306} 307 308size_t Parcel::dataAvail() const 309{ 310 // TODO: decide what to do about the possibility that this can 311 // report an available-data size that exceeds a Java int's max 312 // positive value, causing havoc. Fortunately this will only 313 // happen if someone constructs a Parcel containing more than two 314 // gigabytes of data, which on typical phone hardware is simply 315 // not possible. 316 return dataSize() - dataPosition(); 317} 318 319size_t Parcel::dataPosition() const 320{ 321 return mDataPos; 322} 323 324size_t Parcel::dataCapacity() const 325{ 326 return mDataCapacity; 327} 328 329status_t Parcel::setDataSize(size_t size) 330{ 331 status_t err; 332 err = continueWrite(size); 333 if (err == NO_ERROR) { 334 mDataSize = size; 335 ALOGV("setDataSize Setting data size of %p to %d\n", this, mDataSize); 336 } 337 return err; 338} 339 340void Parcel::setDataPosition(size_t pos) const 341{ 342 mDataPos = pos; 343 mNextObjectHint = 0; 344} 345 346status_t Parcel::setDataCapacity(size_t size) 347{ 348 if (size > mDataCapacity) return continueWrite(size); 349 return NO_ERROR; 350} 351 352status_t Parcel::setData(const uint8_t* buffer, size_t len) 353{ 354 status_t err = restartWrite(len); 355 if (err == NO_ERROR) { 356 memcpy(const_cast<uint8_t*>(data()), buffer, len); 357 mDataSize = len; 358 mFdsKnown = false; 359 } 360 return err; 361} 362 363status_t Parcel::appendFrom(const Parcel *parcel, size_t offset, size_t len) 364{ 365 const sp<ProcessState> proc(ProcessState::self()); 366 status_t err; 367 const uint8_t *data = parcel->mData; 368 const size_t *objects = parcel->mObjects; 369 size_t size = parcel->mObjectsSize; 370 int startPos = mDataPos; 371 int firstIndex = -1, lastIndex = -2; 372 373 if (len == 0) { 374 return NO_ERROR; 375 } 376 377 // range checks against the source parcel size 378 if ((offset > parcel->mDataSize) 379 || (len > parcel->mDataSize) 380 || (offset + len > parcel->mDataSize)) { 381 return BAD_VALUE; 382 } 383 384 // Count objects in range 385 for (int i = 0; i < (int) size; i++) { 386 size_t off = objects[i]; 387 if ((off >= offset) && (off < offset + len)) { 388 if (firstIndex == -1) { 389 firstIndex = i; 390 } 391 lastIndex = i; 392 } 393 } 394 int numObjects = lastIndex - firstIndex + 1; 395 396 if ((mDataSize+len) > mDataCapacity) { 397 // grow data 398 err = growData(len); 399 if (err != NO_ERROR) { 400 return err; 401 } 402 } 403 404 // append data 405 memcpy(mData + mDataPos, data + offset, len); 406 mDataPos += len; 407 mDataSize += len; 408 409 err = NO_ERROR; 410 411 if (numObjects > 0) { 412 // grow objects 413 if (mObjectsCapacity < mObjectsSize + numObjects) { 414 int newSize = ((mObjectsSize + numObjects)*3)/2; 415 size_t *objects = 416 (size_t*)realloc(mObjects, newSize*sizeof(size_t)); 417 if (objects == (size_t*)0) { 418 return NO_MEMORY; 419 } 420 mObjects = objects; 421 mObjectsCapacity = newSize; 422 } 423 424 // append and acquire objects 425 int idx = mObjectsSize; 426 for (int i = firstIndex; i <= lastIndex; i++) { 427 size_t off = objects[i] - offset + startPos; 428 mObjects[idx++] = off; 429 mObjectsSize++; 430 431 flat_binder_object* flat 432 = reinterpret_cast<flat_binder_object*>(mData + off); 433 acquire_object(proc, *flat, this); 434 435 if (flat->type == BINDER_TYPE_FD) { 436 // If this is a file descriptor, we need to dup it so the 437 // new Parcel now owns its own fd, and can declare that we 438 // officially know we have fds. 439 flat->handle = dup(flat->handle); 440 flat->cookie = (void*)1; 441 mHasFds = mFdsKnown = true; 442 if (!mAllowFds) { 443 err = FDS_NOT_ALLOWED; 444 } 445 } 446 } 447 } 448 449 return err; 450} 451 452bool Parcel::pushAllowFds(bool allowFds) 453{ 454 const bool origValue = mAllowFds; 455 if (!allowFds) { 456 mAllowFds = false; 457 } 458 return origValue; 459} 460 461void Parcel::restoreAllowFds(bool lastValue) 462{ 463 mAllowFds = lastValue; 464} 465 466bool Parcel::hasFileDescriptors() const 467{ 468 if (!mFdsKnown) { 469 scanForFds(); 470 } 471 return mHasFds; 472} 473 474// Write RPC headers. (previously just the interface token) 475status_t Parcel::writeInterfaceToken(const String16& interface) 476{ 477 writeInt32(IPCThreadState::self()->getStrictModePolicy() | 478 STRICT_MODE_PENALTY_GATHER); 479 // currently the interface identification token is just its name as a string 480 return writeString16(interface); 481} 482 483bool Parcel::checkInterface(IBinder* binder) const 484{ 485 return enforceInterface(binder->getInterfaceDescriptor()); 486} 487 488bool Parcel::enforceInterface(const String16& interface, 489 IPCThreadState* threadState) const 490{ 491 int32_t strictPolicy = readInt32(); 492 if (threadState == NULL) { 493 threadState = IPCThreadState::self(); 494 } 495 if ((threadState->getLastTransactionBinderFlags() & 496 IBinder::FLAG_ONEWAY) != 0) { 497 // For one-way calls, the callee is running entirely 498 // disconnected from the caller, so disable StrictMode entirely. 499 // Not only does disk/network usage not impact the caller, but 500 // there's no way to commuicate back any violations anyway. 501 threadState->setStrictModePolicy(0); 502 } else { 503 threadState->setStrictModePolicy(strictPolicy); 504 } 505 const String16 str(readString16()); 506 if (str == interface) { 507 return true; 508 } else { 509 ALOGW("**** enforceInterface() expected '%s' but read '%s'\n", 510 String8(interface).string(), String8(str).string()); 511 return false; 512 } 513} 514 515const size_t* Parcel::objects() const 516{ 517 return mObjects; 518} 519 520size_t Parcel::objectsCount() const 521{ 522 return mObjectsSize; 523} 524 525status_t Parcel::errorCheck() const 526{ 527 return mError; 528} 529 530void Parcel::setError(status_t err) 531{ 532 mError = err; 533} 534 535status_t Parcel::finishWrite(size_t len) 536{ 537 //printf("Finish write of %d\n", len); 538 mDataPos += len; 539 ALOGV("finishWrite Setting data pos of %p to %d\n", this, mDataPos); 540 if (mDataPos > mDataSize) { 541 mDataSize = mDataPos; 542 ALOGV("finishWrite Setting data size of %p to %d\n", this, mDataSize); 543 } 544 //printf("New pos=%d, size=%d\n", mDataPos, mDataSize); 545 return NO_ERROR; 546} 547 548status_t Parcel::writeUnpadded(const void* data, size_t len) 549{ 550 size_t end = mDataPos + len; 551 if (end < mDataPos) { 552 // integer overflow 553 return BAD_VALUE; 554 } 555 556 if (end <= mDataCapacity) { 557restart_write: 558 memcpy(mData+mDataPos, data, len); 559 return finishWrite(len); 560 } 561 562 status_t err = growData(len); 563 if (err == NO_ERROR) goto restart_write; 564 return err; 565} 566 567status_t Parcel::write(const void* data, size_t len) 568{ 569 void* const d = writeInplace(len); 570 if (d) { 571 memcpy(d, data, len); 572 return NO_ERROR; 573 } 574 return mError; 575} 576 577void* Parcel::writeInplace(size_t len) 578{ 579 const size_t padded = PAD_SIZE(len); 580 581 // sanity check for integer overflow 582 if (mDataPos+padded < mDataPos) { 583 return NULL; 584 } 585 586 if ((mDataPos+padded) <= mDataCapacity) { 587restart_write: 588 //printf("Writing %ld bytes, padded to %ld\n", len, padded); 589 uint8_t* const data = mData+mDataPos; 590 591 // Need to pad at end? 592 if (padded != len) { 593#if BYTE_ORDER == BIG_ENDIAN 594 static const uint32_t mask[4] = { 595 0x00000000, 0xffffff00, 0xffff0000, 0xff000000 596 }; 597#endif 598#if BYTE_ORDER == LITTLE_ENDIAN 599 static const uint32_t mask[4] = { 600 0x00000000, 0x00ffffff, 0x0000ffff, 0x000000ff 601 }; 602#endif 603 //printf("Applying pad mask: %p to %p\n", (void*)mask[padded-len], 604 // *reinterpret_cast<void**>(data+padded-4)); 605 *reinterpret_cast<uint32_t*>(data+padded-4) &= mask[padded-len]; 606 } 607 608 finishWrite(padded); 609 return data; 610 } 611 612 status_t err = growData(padded); 613 if (err == NO_ERROR) goto restart_write; 614 return NULL; 615} 616 617status_t Parcel::writeInt32(int32_t val) 618{ 619 return writeAligned(val); 620} 621status_t Parcel::writeInt32Array(size_t len, const int32_t *val) { 622 if (!val) { 623 return writeAligned(-1); 624 } 625 status_t ret = writeAligned(len); 626 if (ret == NO_ERROR) { 627 ret = write(val, len * sizeof(*val)); 628 } 629 return ret; 630} 631 632status_t Parcel::writeInt64(int64_t val) 633{ 634 return writeAligned(val); 635} 636 637status_t Parcel::writeFloat(float val) 638{ 639 return writeAligned(val); 640} 641 642#if defined(__mips__) && defined(__mips_hard_float) 643 644status_t Parcel::writeDouble(double val) 645{ 646 union { 647 double d; 648 unsigned long long ll; 649 } u; 650 u.d = val; 651 return writeAligned(u.ll); 652} 653 654#else 655 656status_t Parcel::writeDouble(double val) 657{ 658 return writeAligned(val); 659} 660 661#endif 662 663status_t Parcel::writeIntPtr(intptr_t val) 664{ 665 return writeAligned(val); 666} 667 668status_t Parcel::writeCString(const char* str) 669{ 670 return write(str, strlen(str)+1); 671} 672 673status_t Parcel::writeString8(const String8& str) 674{ 675 status_t err = writeInt32(str.bytes()); 676 // only write string if its length is more than zero characters, 677 // as readString8 will only read if the length field is non-zero. 678 // this is slightly different from how writeString16 works. 679 if (str.bytes() > 0 && err == NO_ERROR) { 680 err = write(str.string(), str.bytes()+1); 681 } 682 return err; 683} 684 685status_t Parcel::writeString16(const String16& str) 686{ 687 return writeString16(str.string(), str.size()); 688} 689 690status_t Parcel::writeString16(const char16_t* str, size_t len) 691{ 692 if (str == NULL) return writeInt32(-1); 693 694 status_t err = writeInt32(len); 695 if (err == NO_ERROR) { 696 len *= sizeof(char16_t); 697 uint8_t* data = (uint8_t*)writeInplace(len+sizeof(char16_t)); 698 if (data) { 699 memcpy(data, str, len); 700 *reinterpret_cast<char16_t*>(data+len) = 0; 701 return NO_ERROR; 702 } 703 err = mError; 704 } 705 return err; 706} 707 708status_t Parcel::writeStrongBinder(const sp<IBinder>& val) 709{ 710 return flatten_binder(ProcessState::self(), val, this); 711} 712 713status_t Parcel::writeWeakBinder(const wp<IBinder>& val) 714{ 715 return flatten_binder(ProcessState::self(), val, this); 716} 717 718status_t Parcel::writeNativeHandle(const native_handle* handle) 719{ 720 if (!handle || handle->version != sizeof(native_handle)) 721 return BAD_TYPE; 722 723 status_t err; 724 err = writeInt32(handle->numFds); 725 if (err != NO_ERROR) return err; 726 727 err = writeInt32(handle->numInts); 728 if (err != NO_ERROR) return err; 729 730 for (int i=0 ; err==NO_ERROR && i<handle->numFds ; i++) 731 err = writeDupFileDescriptor(handle->data[i]); 732 733 if (err != NO_ERROR) { 734 ALOGD("write native handle, write dup fd failed"); 735 return err; 736 } 737 err = write(handle->data + handle->numFds, sizeof(int)*handle->numInts); 738 return err; 739} 740 741status_t Parcel::writeFileDescriptor(int fd, bool takeOwnership) 742{ 743 flat_binder_object obj; 744 obj.type = BINDER_TYPE_FD; 745 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 746 obj.handle = fd; 747 obj.cookie = (void*) (takeOwnership ? 1 : 0); 748 return writeObject(obj, true); 749} 750 751status_t Parcel::writeDupFileDescriptor(int fd) 752{ 753 int dupFd = dup(fd); 754 if (dupFd < 0) { 755 return -errno; 756 } 757 status_t err = writeFileDescriptor(dupFd, true /*takeOwnership*/); 758 if (err) { 759 close(dupFd); 760 } 761 return err; 762} 763 764status_t Parcel::writeBlob(size_t len, WritableBlob* outBlob) 765{ 766 status_t status; 767 768 if (!mAllowFds || len <= IN_PLACE_BLOB_LIMIT) { 769 ALOGV("writeBlob: write in place"); 770 status = writeInt32(0); 771 if (status) return status; 772 773 void* ptr = writeInplace(len); 774 if (!ptr) return NO_MEMORY; 775 776 outBlob->init(false /*mapped*/, ptr, len); 777 return NO_ERROR; 778 } 779 780 ALOGV("writeBlob: write to ashmem"); 781 int fd = ashmem_create_region("Parcel Blob", len); 782 if (fd < 0) return NO_MEMORY; 783 784 int result = ashmem_set_prot_region(fd, PROT_READ | PROT_WRITE); 785 if (result < 0) { 786 status = result; 787 } else { 788 void* ptr = ::mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); 789 if (ptr == MAP_FAILED) { 790 status = -errno; 791 } else { 792 result = ashmem_set_prot_region(fd, PROT_READ); 793 if (result < 0) { 794 status = result; 795 } else { 796 status = writeInt32(1); 797 if (!status) { 798 status = writeFileDescriptor(fd, true /*takeOwnership*/); 799 if (!status) { 800 outBlob->init(true /*mapped*/, ptr, len); 801 return NO_ERROR; 802 } 803 } 804 } 805 } 806 ::munmap(ptr, len); 807 } 808 ::close(fd); 809 return status; 810} 811 812status_t Parcel::write(const FlattenableHelperInterface& val) 813{ 814 status_t err; 815 816 // size if needed 817 const size_t len = val.getFlattenedSize(); 818 const size_t fd_count = val.getFdCount(); 819 820 err = this->writeInt32(len); 821 if (err) return err; 822 823 err = this->writeInt32(fd_count); 824 if (err) return err; 825 826 // payload 827 void* const buf = this->writeInplace(PAD_SIZE(len)); 828 if (buf == NULL) 829 return BAD_VALUE; 830 831 int* fds = NULL; 832 if (fd_count) { 833 fds = new int[fd_count]; 834 } 835 836 err = val.flatten(buf, len, fds, fd_count); 837 for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) { 838 err = this->writeDupFileDescriptor( fds[i] ); 839 } 840 841 if (fd_count) { 842 delete [] fds; 843 } 844 845 return err; 846} 847 848status_t Parcel::writeObject(const flat_binder_object& val, bool nullMetaData) 849{ 850 const bool enoughData = (mDataPos+sizeof(val)) <= mDataCapacity; 851 const bool enoughObjects = mObjectsSize < mObjectsCapacity; 852 if (enoughData && enoughObjects) { 853restart_write: 854 *reinterpret_cast<flat_binder_object*>(mData+mDataPos) = val; 855 856 // Need to write meta-data? 857 if (nullMetaData || val.binder != NULL) { 858 mObjects[mObjectsSize] = mDataPos; 859 acquire_object(ProcessState::self(), val, this); 860 mObjectsSize++; 861 } 862 863 // remember if it's a file descriptor 864 if (val.type == BINDER_TYPE_FD) { 865 if (!mAllowFds) { 866 return FDS_NOT_ALLOWED; 867 } 868 mHasFds = mFdsKnown = true; 869 } 870 871 return finishWrite(sizeof(flat_binder_object)); 872 } 873 874 if (!enoughData) { 875 const status_t err = growData(sizeof(val)); 876 if (err != NO_ERROR) return err; 877 } 878 if (!enoughObjects) { 879 size_t newSize = ((mObjectsSize+2)*3)/2; 880 size_t* objects = (size_t*)realloc(mObjects, newSize*sizeof(size_t)); 881 if (objects == NULL) return NO_MEMORY; 882 mObjects = objects; 883 mObjectsCapacity = newSize; 884 } 885 886 goto restart_write; 887} 888 889status_t Parcel::writeNoException() 890{ 891 return writeInt32(0); 892} 893 894void Parcel::remove(size_t start, size_t amt) 895{ 896 LOG_ALWAYS_FATAL("Parcel::remove() not yet implemented!"); 897} 898 899status_t Parcel::read(void* outData, size_t len) const 900{ 901 if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize) { 902 memcpy(outData, mData+mDataPos, len); 903 mDataPos += PAD_SIZE(len); 904 ALOGV("read Setting data pos of %p to %d\n", this, mDataPos); 905 return NO_ERROR; 906 } 907 return NOT_ENOUGH_DATA; 908} 909 910const void* Parcel::readInplace(size_t len) const 911{ 912 if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize) { 913 const void* data = mData+mDataPos; 914 mDataPos += PAD_SIZE(len); 915 ALOGV("readInplace Setting data pos of %p to %d\n", this, mDataPos); 916 return data; 917 } 918 return NULL; 919} 920 921template<class T> 922status_t Parcel::readAligned(T *pArg) const { 923 COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE(sizeof(T)) == sizeof(T)); 924 925 if ((mDataPos+sizeof(T)) <= mDataSize) { 926 const void* data = mData+mDataPos; 927 mDataPos += sizeof(T); 928 *pArg = *reinterpret_cast<const T*>(data); 929 return NO_ERROR; 930 } else { 931 return NOT_ENOUGH_DATA; 932 } 933} 934 935template<class T> 936T Parcel::readAligned() const { 937 T result; 938 if (readAligned(&result) != NO_ERROR) { 939 result = 0; 940 } 941 942 return result; 943} 944 945template<class T> 946status_t Parcel::writeAligned(T val) { 947 COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE(sizeof(T)) == sizeof(T)); 948 949 if ((mDataPos+sizeof(val)) <= mDataCapacity) { 950restart_write: 951 *reinterpret_cast<T*>(mData+mDataPos) = val; 952 return finishWrite(sizeof(val)); 953 } 954 955 status_t err = growData(sizeof(val)); 956 if (err == NO_ERROR) goto restart_write; 957 return err; 958} 959 960status_t Parcel::readInt32(int32_t *pArg) const 961{ 962 return readAligned(pArg); 963} 964 965int32_t Parcel::readInt32() const 966{ 967 return readAligned<int32_t>(); 968} 969 970 971status_t Parcel::readInt64(int64_t *pArg) const 972{ 973 return readAligned(pArg); 974} 975 976 977int64_t Parcel::readInt64() const 978{ 979 return readAligned<int64_t>(); 980} 981 982status_t Parcel::readFloat(float *pArg) const 983{ 984 return readAligned(pArg); 985} 986 987 988float Parcel::readFloat() const 989{ 990 return readAligned<float>(); 991} 992 993#if defined(__mips__) && defined(__mips_hard_float) 994 995status_t Parcel::readDouble(double *pArg) const 996{ 997 union { 998 double d; 999 unsigned long long ll; 1000 } u; 1001 status_t status; 1002 status = readAligned(&u.ll); 1003 *pArg = u.d; 1004 return status; 1005} 1006 1007double Parcel::readDouble() const 1008{ 1009 union { 1010 double d; 1011 unsigned long long ll; 1012 } u; 1013 u.ll = readAligned<unsigned long long>(); 1014 return u.d; 1015} 1016 1017#else 1018 1019status_t Parcel::readDouble(double *pArg) const 1020{ 1021 return readAligned(pArg); 1022} 1023 1024double Parcel::readDouble() const 1025{ 1026 return readAligned<double>(); 1027} 1028 1029#endif 1030 1031status_t Parcel::readIntPtr(intptr_t *pArg) const 1032{ 1033 return readAligned(pArg); 1034} 1035 1036 1037intptr_t Parcel::readIntPtr() const 1038{ 1039 return readAligned<intptr_t>(); 1040} 1041 1042 1043const char* Parcel::readCString() const 1044{ 1045 const size_t avail = mDataSize-mDataPos; 1046 if (avail > 0) { 1047 const char* str = reinterpret_cast<const char*>(mData+mDataPos); 1048 // is the string's trailing NUL within the parcel's valid bounds? 1049 const char* eos = reinterpret_cast<const char*>(memchr(str, 0, avail)); 1050 if (eos) { 1051 const size_t len = eos - str; 1052 mDataPos += PAD_SIZE(len+1); 1053 ALOGV("readCString Setting data pos of %p to %d\n", this, mDataPos); 1054 return str; 1055 } 1056 } 1057 return NULL; 1058} 1059 1060String8 Parcel::readString8() const 1061{ 1062 int32_t size = readInt32(); 1063 // watch for potential int overflow adding 1 for trailing NUL 1064 if (size > 0 && size < INT32_MAX) { 1065 const char* str = (const char*)readInplace(size+1); 1066 if (str) return String8(str, size); 1067 } 1068 return String8(); 1069} 1070 1071String16 Parcel::readString16() const 1072{ 1073 size_t len; 1074 const char16_t* str = readString16Inplace(&len); 1075 if (str) return String16(str, len); 1076 ALOGE("Reading a NULL string not supported here."); 1077 return String16(); 1078} 1079 1080const char16_t* Parcel::readString16Inplace(size_t* outLen) const 1081{ 1082 int32_t size = readInt32(); 1083 // watch for potential int overflow from size+1 1084 if (size >= 0 && size < INT32_MAX) { 1085 *outLen = size; 1086 const char16_t* str = (const char16_t*)readInplace((size+1)*sizeof(char16_t)); 1087 if (str != NULL) { 1088 return str; 1089 } 1090 } 1091 *outLen = 0; 1092 return NULL; 1093} 1094 1095sp<IBinder> Parcel::readStrongBinder() const 1096{ 1097 sp<IBinder> val; 1098 unflatten_binder(ProcessState::self(), *this, &val); 1099 return val; 1100} 1101 1102wp<IBinder> Parcel::readWeakBinder() const 1103{ 1104 wp<IBinder> val; 1105 unflatten_binder(ProcessState::self(), *this, &val); 1106 return val; 1107} 1108 1109int32_t Parcel::readExceptionCode() const 1110{ 1111 int32_t exception_code = readAligned<int32_t>(); 1112 if (exception_code == EX_HAS_REPLY_HEADER) { 1113 int32_t header_start = dataPosition(); 1114 int32_t header_size = readAligned<int32_t>(); 1115 // Skip over fat responses headers. Not used (or propagated) in 1116 // native code 1117 setDataPosition(header_start + header_size); 1118 // And fat response headers are currently only used when there are no 1119 // exceptions, so return no error: 1120 return 0; 1121 } 1122 return exception_code; 1123} 1124 1125native_handle* Parcel::readNativeHandle() const 1126{ 1127 int numFds, numInts; 1128 status_t err; 1129 err = readInt32(&numFds); 1130 if (err != NO_ERROR) return 0; 1131 err = readInt32(&numInts); 1132 if (err != NO_ERROR) return 0; 1133 1134 native_handle* h = native_handle_create(numFds, numInts); 1135 for (int i=0 ; err==NO_ERROR && i<numFds ; i++) { 1136 h->data[i] = dup(readFileDescriptor()); 1137 if (h->data[i] < 0) err = BAD_VALUE; 1138 } 1139 err = read(h->data + numFds, sizeof(int)*numInts); 1140 if (err != NO_ERROR) { 1141 native_handle_close(h); 1142 native_handle_delete(h); 1143 h = 0; 1144 } 1145 return h; 1146} 1147 1148 1149int Parcel::readFileDescriptor() const 1150{ 1151 const flat_binder_object* flat = readObject(true); 1152 if (flat) { 1153 switch (flat->type) { 1154 case BINDER_TYPE_FD: 1155 //ALOGI("Returning file descriptor %ld from parcel %p\n", flat->handle, this); 1156 return flat->handle; 1157 } 1158 } 1159 return BAD_TYPE; 1160} 1161 1162status_t Parcel::readBlob(size_t len, ReadableBlob* outBlob) const 1163{ 1164 int32_t useAshmem; 1165 status_t status = readInt32(&useAshmem); 1166 if (status) return status; 1167 1168 if (!useAshmem) { 1169 ALOGV("readBlob: read in place"); 1170 const void* ptr = readInplace(len); 1171 if (!ptr) return BAD_VALUE; 1172 1173 outBlob->init(false /*mapped*/, const_cast<void*>(ptr), len); 1174 return NO_ERROR; 1175 } 1176 1177 ALOGV("readBlob: read from ashmem"); 1178 int fd = readFileDescriptor(); 1179 if (fd == int(BAD_TYPE)) return BAD_VALUE; 1180 1181 void* ptr = ::mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0); 1182 if (!ptr) return NO_MEMORY; 1183 1184 outBlob->init(true /*mapped*/, ptr, len); 1185 return NO_ERROR; 1186} 1187 1188status_t Parcel::read(FlattenableHelperInterface& val) const 1189{ 1190 // size 1191 const size_t len = this->readInt32(); 1192 const size_t fd_count = this->readInt32(); 1193 1194 // payload 1195 void const* const buf = this->readInplace(PAD_SIZE(len)); 1196 if (buf == NULL) 1197 return BAD_VALUE; 1198 1199 int* fds = NULL; 1200 if (fd_count) { 1201 fds = new int[fd_count]; 1202 } 1203 1204 status_t err = NO_ERROR; 1205 for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) { 1206 fds[i] = dup(this->readFileDescriptor()); 1207 if (fds[i] < 0) err = BAD_VALUE; 1208 } 1209 1210 if (err == NO_ERROR) { 1211 err = val.unflatten(buf, len, fds, fd_count); 1212 } 1213 1214 if (fd_count) { 1215 delete [] fds; 1216 } 1217 1218 return err; 1219} 1220const flat_binder_object* Parcel::readObject(bool nullMetaData) const 1221{ 1222 const size_t DPOS = mDataPos; 1223 if ((DPOS+sizeof(flat_binder_object)) <= mDataSize) { 1224 const flat_binder_object* obj 1225 = reinterpret_cast<const flat_binder_object*>(mData+DPOS); 1226 mDataPos = DPOS + sizeof(flat_binder_object); 1227 if (!nullMetaData && (obj->cookie == NULL && obj->binder == NULL)) { 1228 // When transferring a NULL object, we don't write it into 1229 // the object list, so we don't want to check for it when 1230 // reading. 1231 ALOGV("readObject Setting data pos of %p to %d\n", this, mDataPos); 1232 return obj; 1233 } 1234 1235 // Ensure that this object is valid... 1236 size_t* const OBJS = mObjects; 1237 const size_t N = mObjectsSize; 1238 size_t opos = mNextObjectHint; 1239 1240 if (N > 0) { 1241 ALOGV("Parcel %p looking for obj at %d, hint=%d\n", 1242 this, DPOS, opos); 1243 1244 // Start at the current hint position, looking for an object at 1245 // the current data position. 1246 if (opos < N) { 1247 while (opos < (N-1) && OBJS[opos] < DPOS) { 1248 opos++; 1249 } 1250 } else { 1251 opos = N-1; 1252 } 1253 if (OBJS[opos] == DPOS) { 1254 // Found it! 1255 ALOGV("Parcel found obj %d at index %d with forward search", 1256 this, DPOS, opos); 1257 mNextObjectHint = opos+1; 1258 ALOGV("readObject Setting data pos of %p to %d\n", this, mDataPos); 1259 return obj; 1260 } 1261 1262 // Look backwards for it... 1263 while (opos > 0 && OBJS[opos] > DPOS) { 1264 opos--; 1265 } 1266 if (OBJS[opos] == DPOS) { 1267 // Found it! 1268 ALOGV("Parcel found obj %d at index %d with backward search", 1269 this, DPOS, opos); 1270 mNextObjectHint = opos+1; 1271 ALOGV("readObject Setting data pos of %p to %d\n", this, mDataPos); 1272 return obj; 1273 } 1274 } 1275 ALOGW("Attempt to read object from Parcel %p at offset %d that is not in the object list", 1276 this, DPOS); 1277 } 1278 return NULL; 1279} 1280 1281void Parcel::closeFileDescriptors() 1282{ 1283 size_t i = mObjectsSize; 1284 if (i > 0) { 1285 //ALOGI("Closing file descriptors for %d objects...", mObjectsSize); 1286 } 1287 while (i > 0) { 1288 i--; 1289 const flat_binder_object* flat 1290 = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]); 1291 if (flat->type == BINDER_TYPE_FD) { 1292 //ALOGI("Closing fd: %ld\n", flat->handle); 1293 close(flat->handle); 1294 } 1295 } 1296} 1297 1298const uint8_t* Parcel::ipcData() const 1299{ 1300 return mData; 1301} 1302 1303size_t Parcel::ipcDataSize() const 1304{ 1305 return (mDataSize > mDataPos ? mDataSize : mDataPos); 1306} 1307 1308const size_t* Parcel::ipcObjects() const 1309{ 1310 return mObjects; 1311} 1312 1313size_t Parcel::ipcObjectsCount() const 1314{ 1315 return mObjectsSize; 1316} 1317 1318void Parcel::ipcSetDataReference(const uint8_t* data, size_t dataSize, 1319 const size_t* objects, size_t objectsCount, release_func relFunc, void* relCookie) 1320{ 1321 size_t minOffset = 0; 1322 freeDataNoInit(); 1323 mError = NO_ERROR; 1324 mData = const_cast<uint8_t*>(data); 1325 mDataSize = mDataCapacity = dataSize; 1326 //ALOGI("setDataReference Setting data size of %p to %lu (pid=%d)\n", this, mDataSize, getpid()); 1327 mDataPos = 0; 1328 ALOGV("setDataReference Setting data pos of %p to %d\n", this, mDataPos); 1329 mObjects = const_cast<size_t*>(objects); 1330 mObjectsSize = mObjectsCapacity = objectsCount; 1331 mNextObjectHint = 0; 1332 mOwner = relFunc; 1333 mOwnerCookie = relCookie; 1334 for (size_t i = 0; i < mObjectsSize; i++) { 1335 size_t offset = mObjects[i]; 1336 if (offset < minOffset) { 1337 ALOGE("%s: bad object offset %zu < %zu\n", 1338 __func__, offset, minOffset); 1339 mObjectsSize = 0; 1340 break; 1341 } 1342 minOffset = offset + sizeof(flat_binder_object); 1343 } 1344 scanForFds(); 1345} 1346 1347void Parcel::print(TextOutput& to, uint32_t flags) const 1348{ 1349 to << "Parcel("; 1350 1351 if (errorCheck() != NO_ERROR) { 1352 const status_t err = errorCheck(); 1353 to << "Error: " << (void*)err << " \"" << strerror(-err) << "\""; 1354 } else if (dataSize() > 0) { 1355 const uint8_t* DATA = data(); 1356 to << indent << HexDump(DATA, dataSize()) << dedent; 1357 const size_t* OBJS = objects(); 1358 const size_t N = objectsCount(); 1359 for (size_t i=0; i<N; i++) { 1360 const flat_binder_object* flat 1361 = reinterpret_cast<const flat_binder_object*>(DATA+OBJS[i]); 1362 to << endl << "Object #" << i << " @ " << (void*)OBJS[i] << ": " 1363 << TypeCode(flat->type & 0x7f7f7f00) 1364 << " = " << flat->binder; 1365 } 1366 } else { 1367 to << "NULL"; 1368 } 1369 1370 to << ")"; 1371} 1372 1373void Parcel::releaseObjects() 1374{ 1375 const sp<ProcessState> proc(ProcessState::self()); 1376 size_t i = mObjectsSize; 1377 uint8_t* const data = mData; 1378 size_t* const objects = mObjects; 1379 while (i > 0) { 1380 i--; 1381 const flat_binder_object* flat 1382 = reinterpret_cast<flat_binder_object*>(data+objects[i]); 1383 release_object(proc, *flat, this); 1384 } 1385} 1386 1387void Parcel::acquireObjects() 1388{ 1389 const sp<ProcessState> proc(ProcessState::self()); 1390 size_t i = mObjectsSize; 1391 uint8_t* const data = mData; 1392 size_t* const objects = mObjects; 1393 while (i > 0) { 1394 i--; 1395 const flat_binder_object* flat 1396 = reinterpret_cast<flat_binder_object*>(data+objects[i]); 1397 acquire_object(proc, *flat, this); 1398 } 1399} 1400 1401void Parcel::freeData() 1402{ 1403 freeDataNoInit(); 1404 initState(); 1405} 1406 1407void Parcel::freeDataNoInit() 1408{ 1409 if (mOwner) { 1410 //ALOGI("Freeing data ref of %p (pid=%d)\n", this, getpid()); 1411 mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie); 1412 } else { 1413 releaseObjects(); 1414 if (mData) free(mData); 1415 if (mObjects) free(mObjects); 1416 } 1417} 1418 1419status_t Parcel::growData(size_t len) 1420{ 1421 size_t newSize = ((mDataSize+len)*3)/2; 1422 return (newSize <= mDataSize) 1423 ? (status_t) NO_MEMORY 1424 : continueWrite(newSize); 1425} 1426 1427status_t Parcel::restartWrite(size_t desired) 1428{ 1429 if (mOwner) { 1430 freeData(); 1431 return continueWrite(desired); 1432 } 1433 1434 uint8_t* data = (uint8_t*)realloc(mData, desired); 1435 if (!data && desired > mDataCapacity) { 1436 mError = NO_MEMORY; 1437 return NO_MEMORY; 1438 } 1439 1440 releaseObjects(); 1441 1442 if (data) { 1443 mData = data; 1444 mDataCapacity = desired; 1445 } 1446 1447 mDataSize = mDataPos = 0; 1448 ALOGV("restartWrite Setting data size of %p to %d\n", this, mDataSize); 1449 ALOGV("restartWrite Setting data pos of %p to %d\n", this, mDataPos); 1450 1451 free(mObjects); 1452 mObjects = NULL; 1453 mObjectsSize = mObjectsCapacity = 0; 1454 mNextObjectHint = 0; 1455 mHasFds = false; 1456 mFdsKnown = true; 1457 mAllowFds = true; 1458 1459 return NO_ERROR; 1460} 1461 1462status_t Parcel::continueWrite(size_t desired) 1463{ 1464 // If shrinking, first adjust for any objects that appear 1465 // after the new data size. 1466 size_t objectsSize = mObjectsSize; 1467 if (desired < mDataSize) { 1468 if (desired == 0) { 1469 objectsSize = 0; 1470 } else { 1471 while (objectsSize > 0) { 1472 if (mObjects[objectsSize-1] < desired) 1473 break; 1474 objectsSize--; 1475 } 1476 } 1477 } 1478 1479 if (mOwner) { 1480 // If the size is going to zero, just release the owner's data. 1481 if (desired == 0) { 1482 freeData(); 1483 return NO_ERROR; 1484 } 1485 1486 // If there is a different owner, we need to take 1487 // posession. 1488 uint8_t* data = (uint8_t*)malloc(desired); 1489 if (!data) { 1490 mError = NO_MEMORY; 1491 return NO_MEMORY; 1492 } 1493 size_t* objects = NULL; 1494 1495 if (objectsSize) { 1496 objects = (size_t*)malloc(objectsSize*sizeof(size_t)); 1497 if (!objects) { 1498 free(data); 1499 1500 mError = NO_MEMORY; 1501 return NO_MEMORY; 1502 } 1503 1504 // Little hack to only acquire references on objects 1505 // we will be keeping. 1506 size_t oldObjectsSize = mObjectsSize; 1507 mObjectsSize = objectsSize; 1508 acquireObjects(); 1509 mObjectsSize = oldObjectsSize; 1510 } 1511 1512 if (mData) { 1513 memcpy(data, mData, mDataSize < desired ? mDataSize : desired); 1514 } 1515 if (objects && mObjects) { 1516 memcpy(objects, mObjects, objectsSize*sizeof(size_t)); 1517 } 1518 //ALOGI("Freeing data ref of %p (pid=%d)\n", this, getpid()); 1519 mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie); 1520 mOwner = NULL; 1521 1522 mData = data; 1523 mObjects = objects; 1524 mDataSize = (mDataSize < desired) ? mDataSize : desired; 1525 ALOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize); 1526 mDataCapacity = desired; 1527 mObjectsSize = mObjectsCapacity = objectsSize; 1528 mNextObjectHint = 0; 1529 1530 } else if (mData) { 1531 if (objectsSize < mObjectsSize) { 1532 // Need to release refs on any objects we are dropping. 1533 const sp<ProcessState> proc(ProcessState::self()); 1534 for (size_t i=objectsSize; i<mObjectsSize; i++) { 1535 const flat_binder_object* flat 1536 = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]); 1537 if (flat->type == BINDER_TYPE_FD) { 1538 // will need to rescan because we may have lopped off the only FDs 1539 mFdsKnown = false; 1540 } 1541 release_object(proc, *flat, this); 1542 } 1543 size_t* objects = 1544 (size_t*)realloc(mObjects, objectsSize*sizeof(size_t)); 1545 if (objects) { 1546 mObjects = objects; 1547 } 1548 mObjectsSize = objectsSize; 1549 mNextObjectHint = 0; 1550 } 1551 1552 // We own the data, so we can just do a realloc(). 1553 if (desired > mDataCapacity) { 1554 uint8_t* data = (uint8_t*)realloc(mData, desired); 1555 if (data) { 1556 mData = data; 1557 mDataCapacity = desired; 1558 } else if (desired > mDataCapacity) { 1559 mError = NO_MEMORY; 1560 return NO_MEMORY; 1561 } 1562 } else { 1563 if (mDataSize > desired) { 1564 mDataSize = desired; 1565 ALOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize); 1566 } 1567 if (mDataPos > desired) { 1568 mDataPos = desired; 1569 ALOGV("continueWrite Setting data pos of %p to %d\n", this, mDataPos); 1570 } 1571 } 1572 1573 } else { 1574 // This is the first data. Easy! 1575 uint8_t* data = (uint8_t*)malloc(desired); 1576 if (!data) { 1577 mError = NO_MEMORY; 1578 return NO_MEMORY; 1579 } 1580 1581 if(!(mDataCapacity == 0 && mObjects == NULL 1582 && mObjectsCapacity == 0)) { 1583 ALOGE("continueWrite: %d/%p/%d/%d", mDataCapacity, mObjects, mObjectsCapacity, desired); 1584 } 1585 1586 mData = data; 1587 mDataSize = mDataPos = 0; 1588 ALOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize); 1589 ALOGV("continueWrite Setting data pos of %p to %d\n", this, mDataPos); 1590 mDataCapacity = desired; 1591 } 1592 1593 return NO_ERROR; 1594} 1595 1596void Parcel::initState() 1597{ 1598 mError = NO_ERROR; 1599 mData = 0; 1600 mDataSize = 0; 1601 mDataCapacity = 0; 1602 mDataPos = 0; 1603 ALOGV("initState Setting data size of %p to %d\n", this, mDataSize); 1604 ALOGV("initState Setting data pos of %p to %d\n", this, mDataPos); 1605 mObjects = NULL; 1606 mObjectsSize = 0; 1607 mObjectsCapacity = 0; 1608 mNextObjectHint = 0; 1609 mHasFds = false; 1610 mFdsKnown = true; 1611 mAllowFds = true; 1612 mOwner = NULL; 1613} 1614 1615void Parcel::scanForFds() const 1616{ 1617 bool hasFds = false; 1618 for (size_t i=0; i<mObjectsSize; i++) { 1619 const flat_binder_object* flat 1620 = reinterpret_cast<const flat_binder_object*>(mData + mObjects[i]); 1621 if (flat->type == BINDER_TYPE_FD) { 1622 hasFds = true; 1623 break; 1624 } 1625 } 1626 mHasFds = hasFds; 1627 mFdsKnown = true; 1628} 1629 1630// --- Parcel::Blob --- 1631 1632Parcel::Blob::Blob() : 1633 mMapped(false), mData(NULL), mSize(0) { 1634} 1635 1636Parcel::Blob::~Blob() { 1637 release(); 1638} 1639 1640void Parcel::Blob::release() { 1641 if (mMapped && mData) { 1642 ::munmap(mData, mSize); 1643 } 1644 clear(); 1645} 1646 1647void Parcel::Blob::init(bool mapped, void* data, size_t size) { 1648 mMapped = mapped; 1649 mData = data; 1650 mSize = size; 1651} 1652 1653void Parcel::Blob::clear() { 1654 mMapped = false; 1655 mData = NULL; 1656 mSize = 0; 1657} 1658 1659}; // namespace android 1660