Parcel.cpp revision 709ae9a0a5775c75b81d011ae9624f28787e5b15 
1/*
2 * Copyright (C) 2005 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#define LOG_TAG "Parcel"
18//#define LOG_NDEBUG 0
19
20#include <binder/Parcel.h>
21
22#include <binder/IPCThreadState.h>
23#include <binder/Binder.h>
24#include <binder/BpBinder.h>
25#include <binder/ProcessState.h>
26#include <binder/Status.h>
27#include <binder/TextOutput.h>
28
29#include <errno.h>
30#include <utils/Debug.h>
31#include <utils/Log.h>
32#include <utils/String8.h>
33#include <utils/String16.h>
34#include <utils/misc.h>
35#include <utils/Flattenable.h>
36#include <cutils/ashmem.h>
37
38#include <private/binder/binder_module.h>
39#include <private/binder/Static.h>
40
41#include <inttypes.h>
42#include <stdio.h>
43#include <stdlib.h>
44#include <stdint.h>
45#include <sys/mman.h>
46
47#ifndef INT32_MAX
48#define INT32_MAX ((int32_t)(2147483647))
49#endif
50
51#define LOG_REFS(...)
52//#define LOG_REFS(...) ALOG(LOG_DEBUG, "Parcel", __VA_ARGS__)
53#define LOG_ALLOC(...)
54//#define LOG_ALLOC(...) ALOG(LOG_DEBUG, "Parcel", __VA_ARGS__)
55
56// ---------------------------------------------------------------------------
57
58// This macro should never be used at runtime, as a too large value
59// of s could cause an integer overflow. Instead, you should always
60// use the wrapper function pad_size()
61#define PAD_SIZE_UNSAFE(s) (((s)+3)&~3)
62
63static size_t pad_size(size_t s) {
64    if (s > (SIZE_T_MAX - 3)) {
65        abort();
66    }
67    return PAD_SIZE_UNSAFE(s);
68}
69
70// Note: must be kept in sync with android/os/StrictMode.java's PENALTY_GATHER
71#define STRICT_MODE_PENALTY_GATHER (0x40 << 16)
72
73// XXX This can be made public if we want to provide
74// support for typed data.
75struct small_flat_data
76{
77    uint32_t type;
78    uint32_t data;
79};
80
81namespace android {
82
83static pthread_mutex_t gParcelGlobalAllocSizeLock = PTHREAD_MUTEX_INITIALIZER;
84static size_t gParcelGlobalAllocSize = 0;
85static size_t gParcelGlobalAllocCount = 0;
86
87// Maximum size of a blob to transfer in-place.
88static const size_t BLOB_INPLACE_LIMIT = 16 * 1024;
89
90enum {
91    BLOB_INPLACE = 0,
92    BLOB_ASHMEM_IMMUTABLE = 1,
93    BLOB_ASHMEM_MUTABLE = 2,
94};
95
96void acquire_object(const sp<ProcessState>& proc,
97    const flat_binder_object& obj, const void* who, size_t* outAshmemSize)
98{
99    switch (obj.type) {
100        case BINDER_TYPE_BINDER:
101            if (obj.binder) {
102                LOG_REFS("Parcel %p acquiring reference on local %p", who, obj.cookie);
103                reinterpret_cast<IBinder*>(obj.cookie)->incStrong(who);
104            }
105            return;
106        case BINDER_TYPE_WEAK_BINDER:
107            if (obj.binder)
108                reinterpret_cast<RefBase::weakref_type*>(obj.binder)->incWeak(who);
109            return;
110        case BINDER_TYPE_HANDLE: {
111            const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle);
112            if (b != NULL) {
113                LOG_REFS("Parcel %p acquiring reference on remote %p", who, b.get());
114                b->incStrong(who);
115            }
116            return;
117        }
118        case BINDER_TYPE_WEAK_HANDLE: {
119            const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle);
120            if (b != NULL) b.get_refs()->incWeak(who);
121            return;
122        }
123        case BINDER_TYPE_FD: {
124            if (obj.cookie != 0) {
125                if (outAshmemSize != NULL) {
126                    // If we own an ashmem fd, keep track of how much memory it refers to.
127                    int size = ashmem_get_size_region(obj.handle);
128                    if (size > 0) {
129                        *outAshmemSize += size;
130                    }
131                }
132            }
133            return;
134        }
135    }
136
137    ALOGD("Invalid object type 0x%08x", obj.type);
138}
139
140void acquire_object(const sp<ProcessState>& proc,
141    const flat_binder_object& obj, const void* who)
142{
143    acquire_object(proc, obj, who, NULL);
144}
145
146static void release_object(const sp<ProcessState>& proc,
147    const flat_binder_object& obj, const void* who, size_t* outAshmemSize)
148{
149    switch (obj.type) {
150        case BINDER_TYPE_BINDER:
151            if (obj.binder) {
152                LOG_REFS("Parcel %p releasing reference on local %p", who, obj.cookie);
153                reinterpret_cast<IBinder*>(obj.cookie)->decStrong(who);
154            }
155            return;
156        case BINDER_TYPE_WEAK_BINDER:
157            if (obj.binder)
158                reinterpret_cast<RefBase::weakref_type*>(obj.binder)->decWeak(who);
159            return;
160        case BINDER_TYPE_HANDLE: {
161            const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle);
162            if (b != NULL) {
163                LOG_REFS("Parcel %p releasing reference on remote %p", who, b.get());
164                b->decStrong(who);
165            }
166            return;
167        }
168        case BINDER_TYPE_WEAK_HANDLE: {
169            const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle);
170            if (b != NULL) b.get_refs()->decWeak(who);
171            return;
172        }
173        case BINDER_TYPE_FD: {
174            if (outAshmemSize != NULL) {
175                if (obj.cookie != 0) {
176                    int size = ashmem_get_size_region(obj.handle);
177                    if (size > 0) {
178                        *outAshmemSize -= size;
179                    }
180
181                    close(obj.handle);
182                }
183            }
184            return;
185        }
186    }
187
188    ALOGE("Invalid object type 0x%08x", obj.type);
189}
190
191void release_object(const sp<ProcessState>& proc,
192    const flat_binder_object& obj, const void* who)
193{
194    release_object(proc, obj, who, NULL);
195}
196
197inline static status_t finish_flatten_binder(
198    const sp<IBinder>& /*binder*/, const flat_binder_object& flat, Parcel* out)
199{
200    return out->writeObject(flat, false);
201}
202
203status_t flatten_binder(const sp<ProcessState>& /*proc*/,
204    const sp<IBinder>& binder, Parcel* out)
205{
206    flat_binder_object obj;
207
208    obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS;
209    if (binder != NULL) {
210        IBinder *local = binder->localBinder();
211        if (!local) {
212            BpBinder *proxy = binder->remoteBinder();
213            if (proxy == NULL) {
214                ALOGE("null proxy");
215            }
216            const int32_t handle = proxy ? proxy->handle() : 0;
217            obj.type = BINDER_TYPE_HANDLE;
218            obj.binder = 0; /* Don't pass uninitialized stack data to a remote process */
219            obj.handle = handle;
220            obj.cookie = 0;
221        } else {
222            obj.type = BINDER_TYPE_BINDER;
223            obj.binder = reinterpret_cast<uintptr_t>(local->getWeakRefs());
224            obj.cookie = reinterpret_cast<uintptr_t>(local);
225        }
226    } else {
227        obj.type = BINDER_TYPE_BINDER;
228        obj.binder = 0;
229        obj.cookie = 0;
230    }
231
232    return finish_flatten_binder(binder, obj, out);
233}
234
235status_t flatten_binder(const sp<ProcessState>& /*proc*/,
236    const wp<IBinder>& binder, Parcel* out)
237{
238    flat_binder_object obj;
239
240    obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS;
241    if (binder != NULL) {
242        sp<IBinder> real = binder.promote();
243        if (real != NULL) {
244            IBinder *local = real->localBinder();
245            if (!local) {
246                BpBinder *proxy = real->remoteBinder();
247                if (proxy == NULL) {
248                    ALOGE("null proxy");
249                }
250                const int32_t handle = proxy ? proxy->handle() : 0;
251                obj.type = BINDER_TYPE_WEAK_HANDLE;
252                obj.binder = 0; /* Don't pass uninitialized stack data to a remote process */
253                obj.handle = handle;
254                obj.cookie = 0;
255            } else {
256                obj.type = BINDER_TYPE_WEAK_BINDER;
257                obj.binder = reinterpret_cast<uintptr_t>(binder.get_refs());
258                obj.cookie = reinterpret_cast<uintptr_t>(binder.unsafe_get());
259            }
260            return finish_flatten_binder(real, obj, out);
261        }
262
263        // XXX How to deal?  In order to flatten the given binder,
264        // we need to probe it for information, which requires a primary
265        // reference...  but we don't have one.
266        //
267        // The OpenBinder implementation uses a dynamic_cast<> here,
268        // but we can't do that with the different reference counting
269        // implementation we are using.
270        ALOGE("Unable to unflatten Binder weak reference!");
271        obj.type = BINDER_TYPE_BINDER;
272        obj.binder = 0;
273        obj.cookie = 0;
274        return finish_flatten_binder(NULL, obj, out);
275
276    } else {
277        obj.type = BINDER_TYPE_BINDER;
278        obj.binder = 0;
279        obj.cookie = 0;
280        return finish_flatten_binder(NULL, obj, out);
281    }
282}
283
284inline static status_t finish_unflatten_binder(
285    BpBinder* /*proxy*/, const flat_binder_object& /*flat*/,
286    const Parcel& /*in*/)
287{
288    return NO_ERROR;
289}
290
291status_t unflatten_binder(const sp<ProcessState>& proc,
292    const Parcel& in, sp<IBinder>* out)
293{
294    const flat_binder_object* flat = in.readObject(false);
295
296    if (flat) {
297        switch (flat->type) {
298            case BINDER_TYPE_BINDER:
299                *out = reinterpret_cast<IBinder*>(flat->cookie);
300                return finish_unflatten_binder(NULL, *flat, in);
301            case BINDER_TYPE_HANDLE:
302                *out = proc->getStrongProxyForHandle(flat->handle);
303                return finish_unflatten_binder(
304                    static_cast<BpBinder*>(out->get()), *flat, in);
305        }
306    }
307    return BAD_TYPE;
308}
309
310status_t unflatten_binder(const sp<ProcessState>& proc,
311    const Parcel& in, wp<IBinder>* out)
312{
313    const flat_binder_object* flat = in.readObject(false);
314
315    if (flat) {
316        switch (flat->type) {
317            case BINDER_TYPE_BINDER:
318                *out = reinterpret_cast<IBinder*>(flat->cookie);
319                return finish_unflatten_binder(NULL, *flat, in);
320            case BINDER_TYPE_WEAK_BINDER:
321                if (flat->binder != 0) {
322                    out->set_object_and_refs(
323                        reinterpret_cast<IBinder*>(flat->cookie),
324                        reinterpret_cast<RefBase::weakref_type*>(flat->binder));
325                } else {
326                    *out = NULL;
327                }
328                return finish_unflatten_binder(NULL, *flat, in);
329            case BINDER_TYPE_HANDLE:
330            case BINDER_TYPE_WEAK_HANDLE:
331                *out = proc->getWeakProxyForHandle(flat->handle);
332                return finish_unflatten_binder(
333                    static_cast<BpBinder*>(out->unsafe_get()), *flat, in);
334        }
335    }
336    return BAD_TYPE;
337}
338
339// ---------------------------------------------------------------------------
340
341Parcel::Parcel()
342{
343    LOG_ALLOC("Parcel %p: constructing", this);
344    initState();
345}
346
347Parcel::~Parcel()
348{
349    freeDataNoInit();
350    LOG_ALLOC("Parcel %p: destroyed", this);
351}
352
353size_t Parcel::getGlobalAllocSize() {
354    pthread_mutex_lock(&gParcelGlobalAllocSizeLock);
355    size_t size = gParcelGlobalAllocSize;
356    pthread_mutex_unlock(&gParcelGlobalAllocSizeLock);
357    return size;
358}
359
360size_t Parcel::getGlobalAllocCount() {
361    pthread_mutex_lock(&gParcelGlobalAllocSizeLock);
362    size_t count = gParcelGlobalAllocCount;
363    pthread_mutex_unlock(&gParcelGlobalAllocSizeLock);
364    return count;
365}
366
367const uint8_t* Parcel::data() const
368{
369    return mData;
370}
371
372size_t Parcel::dataSize() const
373{
374    return (mDataSize > mDataPos ? mDataSize : mDataPos);
375}
376
377size_t Parcel::dataAvail() const
378{
379    // TODO: decide what to do about the possibility that this can
380    // report an available-data size that exceeds a Java int's max
381    // positive value, causing havoc.  Fortunately this will only
382    // happen if someone constructs a Parcel containing more than two
383    // gigabytes of data, which on typical phone hardware is simply
384    // not possible.
385    return dataSize() - dataPosition();
386}
387
388size_t Parcel::dataPosition() const
389{
390    return mDataPos;
391}
392
393size_t Parcel::dataCapacity() const
394{
395    return mDataCapacity;
396}
397
398status_t Parcel::setDataSize(size_t size)
399{
400    if (size > INT32_MAX) {
401        // don't accept size_t values which may have come from an
402        // inadvertent conversion from a negative int.
403        return BAD_VALUE;
404    }
405
406    status_t err;
407    err = continueWrite(size);
408    if (err == NO_ERROR) {
409        mDataSize = size;
410        ALOGV("setDataSize Setting data size of %p to %zu", this, mDataSize);
411    }
412    return err;
413}
414
415void Parcel::setDataPosition(size_t pos) const
416{
417    if (pos > INT32_MAX) {
418        // don't accept size_t values which may have come from an
419        // inadvertent conversion from a negative int.
420        abort();
421    }
422
423    mDataPos = pos;
424    mNextObjectHint = 0;
425}
426
427status_t Parcel::setDataCapacity(size_t size)
428{
429    if (size > INT32_MAX) {
430        // don't accept size_t values which may have come from an
431        // inadvertent conversion from a negative int.
432        return BAD_VALUE;
433    }
434
435    if (size > mDataCapacity) return continueWrite(size);
436    return NO_ERROR;
437}
438
439status_t Parcel::setData(const uint8_t* buffer, size_t len)
440{
441    if (len > INT32_MAX) {
442        // don't accept size_t values which may have come from an
443        // inadvertent conversion from a negative int.
444        return BAD_VALUE;
445    }
446
447    status_t err = restartWrite(len);
448    if (err == NO_ERROR) {
449        memcpy(const_cast<uint8_t*>(data()), buffer, len);
450        mDataSize = len;
451        mFdsKnown = false;
452    }
453    return err;
454}
455
456status_t Parcel::appendFrom(const Parcel *parcel, size_t offset, size_t len)
457{
458    const sp<ProcessState> proc(ProcessState::self());
459    status_t err;
460    const uint8_t *data = parcel->mData;
461    const binder_size_t *objects = parcel->mObjects;
462    size_t size = parcel->mObjectsSize;
463    int startPos = mDataPos;
464    int firstIndex = -1, lastIndex = -2;
465
466    if (len == 0) {
467        return NO_ERROR;
468    }
469
470    if (len > INT32_MAX) {
471        // don't accept size_t values which may have come from an
472        // inadvertent conversion from a negative int.
473        return BAD_VALUE;
474    }
475
476    // range checks against the source parcel size
477    if ((offset > parcel->mDataSize)
478            || (len > parcel->mDataSize)
479            || (offset + len > parcel->mDataSize)) {
480        return BAD_VALUE;
481    }
482
483    // Count objects in range
484    for (int i = 0; i < (int) size; i++) {
485        size_t off = objects[i];
486        if ((off >= offset) && (off + sizeof(flat_binder_object) <= offset + len)) {
487            if (firstIndex == -1) {
488                firstIndex = i;
489            }
490            lastIndex = i;
491        }
492    }
493    int numObjects = lastIndex - firstIndex + 1;
494
495    if ((mDataSize+len) > mDataCapacity) {
496        // grow data
497        err = growData(len);
498        if (err != NO_ERROR) {
499            return err;
500        }
501    }
502
503    // append data
504    memcpy(mData + mDataPos, data + offset, len);
505    mDataPos += len;
506    mDataSize += len;
507
508    err = NO_ERROR;
509
510    if (numObjects > 0) {
511        // grow objects
512        if (mObjectsCapacity < mObjectsSize + numObjects) {
513            size_t newSize = ((mObjectsSize + numObjects)*3)/2;
514            if (newSize < mObjectsSize) return NO_MEMORY;   // overflow
515            binder_size_t *objects =
516                (binder_size_t*)realloc(mObjects, newSize*sizeof(binder_size_t));
517            if (objects == (binder_size_t*)0) {
518                return NO_MEMORY;
519            }
520            mObjects = objects;
521            mObjectsCapacity = newSize;
522        }
523
524        // append and acquire objects
525        int idx = mObjectsSize;
526        for (int i = firstIndex; i <= lastIndex; i++) {
527            size_t off = objects[i] - offset + startPos;
528            mObjects[idx++] = off;
529            mObjectsSize++;
530
531            flat_binder_object* flat
532                = reinterpret_cast<flat_binder_object*>(mData + off);
533            acquire_object(proc, *flat, this, &mOpenAshmemSize);
534
535            if (flat->type == BINDER_TYPE_FD) {
536                // If this is a file descriptor, we need to dup it so the
537                // new Parcel now owns its own fd, and can declare that we
538                // officially know we have fds.
539                flat->handle = dup(flat->handle);
540                flat->cookie = 1;
541                mHasFds = mFdsKnown = true;
542                if (!mAllowFds) {
543                    err = FDS_NOT_ALLOWED;
544                }
545            }
546        }
547    }
548
549    return err;
550}
551
552bool Parcel::allowFds() const
553{
554    return mAllowFds;
555}
556
557bool Parcel::pushAllowFds(bool allowFds)
558{
559    const bool origValue = mAllowFds;
560    if (!allowFds) {
561        mAllowFds = false;
562    }
563    return origValue;
564}
565
566void Parcel::restoreAllowFds(bool lastValue)
567{
568    mAllowFds = lastValue;
569}
570
571bool Parcel::hasFileDescriptors() const
572{
573    if (!mFdsKnown) {
574        scanForFds();
575    }
576    return mHasFds;
577}
578
579// Write RPC headers.  (previously just the interface token)
580status_t Parcel::writeInterfaceToken(const String16& interface)
581{
582    writeInt32(IPCThreadState::self()->getStrictModePolicy() |
583               STRICT_MODE_PENALTY_GATHER);
584    // currently the interface identification token is just its name as a string
585    return writeString16(interface);
586}
587
588bool Parcel::checkInterface(IBinder* binder) const
589{
590    return enforceInterface(binder->getInterfaceDescriptor());
591}
592
593bool Parcel::enforceInterface(const String16& interface,
594                              IPCThreadState* threadState) const
595{
596    int32_t strictPolicy = readInt32();
597    if (threadState == NULL) {
598        threadState = IPCThreadState::self();
599    }
600    if ((threadState->getLastTransactionBinderFlags() &
601         IBinder::FLAG_ONEWAY) != 0) {
602      // For one-way calls, the callee is running entirely
603      // disconnected from the caller, so disable StrictMode entirely.
604      // Not only does disk/network usage not impact the caller, but
605      // there's no way to commuicate back any violations anyway.
606      threadState->setStrictModePolicy(0);
607    } else {
608      threadState->setStrictModePolicy(strictPolicy);
609    }
610    const String16 str(readString16());
611    if (str == interface) {
612        return true;
613    } else {
614        ALOGW("**** enforceInterface() expected '%s' but read '%s'",
615                String8(interface).string(), String8(str).string());
616        return false;
617    }
618}
619
620const binder_size_t* Parcel::objects() const
621{
622    return mObjects;
623}
624
625size_t Parcel::objectsCount() const
626{
627    return mObjectsSize;
628}
629
630status_t Parcel::errorCheck() const
631{
632    return mError;
633}
634
635void Parcel::setError(status_t err)
636{
637    mError = err;
638}
639
640status_t Parcel::finishWrite(size_t len)
641{
642    if (len > INT32_MAX) {
643        // don't accept size_t values which may have come from an
644        // inadvertent conversion from a negative int.
645        return BAD_VALUE;
646    }
647
648    //printf("Finish write of %d\n", len);
649    mDataPos += len;
650    ALOGV("finishWrite Setting data pos of %p to %zu", this, mDataPos);
651    if (mDataPos > mDataSize) {
652        mDataSize = mDataPos;
653        ALOGV("finishWrite Setting data size of %p to %zu", this, mDataSize);
654    }
655    //printf("New pos=%d, size=%d\n", mDataPos, mDataSize);
656    return NO_ERROR;
657}
658
659status_t Parcel::writeUnpadded(const void* data, size_t len)
660{
661    if (len > INT32_MAX) {
662        // don't accept size_t values which may have come from an
663        // inadvertent conversion from a negative int.
664        return BAD_VALUE;
665    }
666
667    size_t end = mDataPos + len;
668    if (end < mDataPos) {
669        // integer overflow
670        return BAD_VALUE;
671    }
672
673    if (end <= mDataCapacity) {
674restart_write:
675        memcpy(mData+mDataPos, data, len);
676        return finishWrite(len);
677    }
678
679    status_t err = growData(len);
680    if (err == NO_ERROR) goto restart_write;
681    return err;
682}
683
684status_t Parcel::write(const void* data, size_t len)
685{
686    if (len > INT32_MAX) {
687        // don't accept size_t values which may have come from an
688        // inadvertent conversion from a negative int.
689        return BAD_VALUE;
690    }
691
692    void* const d = writeInplace(len);
693    if (d) {
694        memcpy(d, data, len);
695        return NO_ERROR;
696    }
697    return mError;
698}
699
700void* Parcel::writeInplace(size_t len)
701{
702    if (len > INT32_MAX) {
703        // don't accept size_t values which may have come from an
704        // inadvertent conversion from a negative int.
705        return NULL;
706    }
707
708    const size_t padded = pad_size(len);
709
710    // sanity check for integer overflow
711    if (mDataPos+padded < mDataPos) {
712        return NULL;
713    }
714
715    if ((mDataPos+padded) <= mDataCapacity) {
716restart_write:
717        //printf("Writing %ld bytes, padded to %ld\n", len, padded);
718        uint8_t* const data = mData+mDataPos;
719
720        // Need to pad at end?
721        if (padded != len) {
722#if BYTE_ORDER == BIG_ENDIAN
723            static const uint32_t mask[4] = {
724                0x00000000, 0xffffff00, 0xffff0000, 0xff000000
725            };
726#endif
727#if BYTE_ORDER == LITTLE_ENDIAN
728            static const uint32_t mask[4] = {
729                0x00000000, 0x00ffffff, 0x0000ffff, 0x000000ff
730            };
731#endif
732            //printf("Applying pad mask: %p to %p\n", (void*)mask[padded-len],
733            //    *reinterpret_cast<void**>(data+padded-4));
734            *reinterpret_cast<uint32_t*>(data+padded-4) &= mask[padded-len];
735        }
736
737        finishWrite(padded);
738        return data;
739    }
740
741    status_t err = growData(padded);
742    if (err == NO_ERROR) goto restart_write;
743    return NULL;
744}
745
746status_t Parcel::writeByteVector(const std::vector<int8_t>& val)
747{
748    status_t status;
749    if (val.size() > std::numeric_limits<int32_t>::max()) {
750        status = BAD_VALUE;
751        return status;
752    }
753
754    status = writeInt32(val.size());
755    if (status != OK) {
756        return status;
757    }
758
759    void* data = writeInplace(val.size());
760    if (!data) {
761        status = BAD_VALUE;
762        return status;
763    }
764
765    memcpy(data, val.data(), val.size());
766    return status;
767}
768
769status_t Parcel::writeInt32Vector(const std::vector<int32_t>& val)
770{
771    return writeTypedVector(val, &Parcel::writeInt32);
772}
773
774status_t Parcel::writeInt64Vector(const std::vector<int64_t>& val)
775{
776    return writeTypedVector(val, &Parcel::writeInt64);
777}
778
779status_t Parcel::writeFloatVector(const std::vector<float>& val)
780{
781    return writeTypedVector(val, &Parcel::writeFloat);
782}
783
784status_t Parcel::writeDoubleVector(const std::vector<double>& val)
785{
786    return writeTypedVector(val, &Parcel::writeDouble);
787}
788
789status_t Parcel::writeBoolVector(const std::vector<bool>& val)
790{
791    return writeTypedVector(val, &Parcel::writeBool);
792}
793
794status_t Parcel::writeCharVector(const std::vector<char16_t>& val)
795{
796    return writeTypedVector(val, &Parcel::writeChar);
797}
798
799status_t Parcel::writeString16Vector(const std::vector<String16>& val)
800{
801    return writeTypedVector(val, &Parcel::writeString16);
802}
803
804status_t Parcel::writeInt32(int32_t val)
805{
806    return writeAligned(val);
807}
808
809status_t Parcel::writeUint32(uint32_t val)
810{
811    return writeAligned(val);
812}
813
814status_t Parcel::writeInt32Array(size_t len, const int32_t *val) {
815    if (len > INT32_MAX) {
816        // don't accept size_t values which may have come from an
817        // inadvertent conversion from a negative int.
818        return BAD_VALUE;
819    }
820
821    if (!val) {
822        return writeInt32(-1);
823    }
824    status_t ret = writeInt32(static_cast<uint32_t>(len));
825    if (ret == NO_ERROR) {
826        ret = write(val, len * sizeof(*val));
827    }
828    return ret;
829}
830status_t Parcel::writeByteArray(size_t len, const uint8_t *val) {
831    if (len > INT32_MAX) {
832        // don't accept size_t values which may have come from an
833        // inadvertent conversion from a negative int.
834        return BAD_VALUE;
835    }
836
837    if (!val) {
838        return writeInt32(-1);
839    }
840    status_t ret = writeInt32(static_cast<uint32_t>(len));
841    if (ret == NO_ERROR) {
842        ret = write(val, len * sizeof(*val));
843    }
844    return ret;
845}
846
847status_t Parcel::writeBool(bool val)
848{
849    return writeInt32(int32_t(val));
850}
851
852status_t Parcel::writeChar(char16_t val)
853{
854    return writeInt32(int32_t(val));
855}
856
857status_t Parcel::writeByte(int8_t val)
858{
859    return writeInt32(int32_t(val));
860}
861
862status_t Parcel::writeInt64(int64_t val)
863{
864    return writeAligned(val);
865}
866
867status_t Parcel::writeUint64(uint64_t val)
868{
869    return writeAligned(val);
870}
871
872status_t Parcel::writePointer(uintptr_t val)
873{
874    return writeAligned<binder_uintptr_t>(val);
875}
876
877status_t Parcel::writeFloat(float val)
878{
879    return writeAligned(val);
880}
881
882#if defined(__mips__) && defined(__mips_hard_float)
883
884status_t Parcel::writeDouble(double val)
885{
886    union {
887        double d;
888        unsigned long long ll;
889    } u;
890    u.d = val;
891    return writeAligned(u.ll);
892}
893
894#else
895
896status_t Parcel::writeDouble(double val)
897{
898    return writeAligned(val);
899}
900
901#endif
902
903status_t Parcel::writeCString(const char* str)
904{
905    return write(str, strlen(str)+1);
906}
907
908status_t Parcel::writeString8(const String8& str)
909{
910    status_t err = writeInt32(str.bytes());
911    // only write string if its length is more than zero characters,
912    // as readString8 will only read if the length field is non-zero.
913    // this is slightly different from how writeString16 works.
914    if (str.bytes() > 0 && err == NO_ERROR) {
915        err = write(str.string(), str.bytes()+1);
916    }
917    return err;
918}
919
920status_t Parcel::writeString16(const String16& str)
921{
922    return writeString16(str.string(), str.size());
923}
924
925status_t Parcel::writeString16(const char16_t* str, size_t len)
926{
927    if (str == NULL) return writeInt32(-1);
928
929    status_t err = writeInt32(len);
930    if (err == NO_ERROR) {
931        len *= sizeof(char16_t);
932        uint8_t* data = (uint8_t*)writeInplace(len+sizeof(char16_t));
933        if (data) {
934            memcpy(data, str, len);
935            *reinterpret_cast<char16_t*>(data+len) = 0;
936            return NO_ERROR;
937        }
938        err = mError;
939    }
940    return err;
941}
942
943status_t Parcel::writeStrongBinder(const sp<IBinder>& val)
944{
945    return flatten_binder(ProcessState::self(), val, this);
946}
947
948status_t Parcel::writeStrongBinderVector(const std::vector<sp<IBinder>>& val)
949{
950    return writeTypedVector(val, &Parcel::writeStrongBinder);
951}
952
953status_t Parcel::readStrongBinderVector(std::vector<sp<IBinder>>* val) const {
954    return readTypedVector(val, &Parcel::readStrongBinder);
955}
956
957status_t Parcel::writeWeakBinder(const wp<IBinder>& val)
958{
959    return flatten_binder(ProcessState::self(), val, this);
960}
961
962status_t Parcel::writeNativeHandle(const native_handle* handle)
963{
964    if (!handle || handle->version != sizeof(native_handle))
965        return BAD_TYPE;
966
967    status_t err;
968    err = writeInt32(handle->numFds);
969    if (err != NO_ERROR) return err;
970
971    err = writeInt32(handle->numInts);
972    if (err != NO_ERROR) return err;
973
974    for (int i=0 ; err==NO_ERROR && i<handle->numFds ; i++)
975        err = writeDupFileDescriptor(handle->data[i]);
976
977    if (err != NO_ERROR) {
978        ALOGD("write native handle, write dup fd failed");
979        return err;
980    }
981    err = write(handle->data + handle->numFds, sizeof(int)*handle->numInts);
982    return err;
983}
984
985status_t Parcel::writeFileDescriptor(int fd, bool takeOwnership)
986{
987    flat_binder_object obj;
988    obj.type = BINDER_TYPE_FD;
989    obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS;
990    obj.binder = 0; /* Don't pass uninitialized stack data to a remote process */
991    obj.handle = fd;
992    obj.cookie = takeOwnership ? 1 : 0;
993    return writeObject(obj, true);
994}
995
996status_t Parcel::writeDupFileDescriptor(int fd)
997{
998    int dupFd = dup(fd);
999    if (dupFd < 0) {
1000        return -errno;
1001    }
1002    status_t err = writeFileDescriptor(dupFd, true /*takeOwnership*/);
1003    if (err) {
1004        close(dupFd);
1005    }
1006    return err;
1007}
1008
1009status_t Parcel::writeBlob(size_t len, bool mutableCopy, WritableBlob* outBlob)
1010{
1011    if (len > INT32_MAX) {
1012        // don't accept size_t values which may have come from an
1013        // inadvertent conversion from a negative int.
1014        return BAD_VALUE;
1015    }
1016
1017    status_t status;
1018    if (!mAllowFds || len <= BLOB_INPLACE_LIMIT) {
1019        ALOGV("writeBlob: write in place");
1020        status = writeInt32(BLOB_INPLACE);
1021        if (status) return status;
1022
1023        void* ptr = writeInplace(len);
1024        if (!ptr) return NO_MEMORY;
1025
1026        outBlob->init(-1, ptr, len, false);
1027        return NO_ERROR;
1028    }
1029
1030    ALOGV("writeBlob: write to ashmem");
1031    int fd = ashmem_create_region("Parcel Blob", len);
1032    if (fd < 0) return NO_MEMORY;
1033
1034    int result = ashmem_set_prot_region(fd, PROT_READ | PROT_WRITE);
1035    if (result < 0) {
1036        status = result;
1037    } else {
1038        void* ptr = ::mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
1039        if (ptr == MAP_FAILED) {
1040            status = -errno;
1041        } else {
1042            if (!mutableCopy) {
1043                result = ashmem_set_prot_region(fd, PROT_READ);
1044            }
1045            if (result < 0) {
1046                status = result;
1047            } else {
1048                status = writeInt32(mutableCopy ? BLOB_ASHMEM_MUTABLE : BLOB_ASHMEM_IMMUTABLE);
1049                if (!status) {
1050                    status = writeFileDescriptor(fd, true /*takeOwnership*/);
1051                    if (!status) {
1052                        outBlob->init(fd, ptr, len, mutableCopy);
1053                        return NO_ERROR;
1054                    }
1055                }
1056            }
1057        }
1058        ::munmap(ptr, len);
1059    }
1060    ::close(fd);
1061    return status;
1062}
1063
1064status_t Parcel::writeDupImmutableBlobFileDescriptor(int fd)
1065{
1066    // Must match up with what's done in writeBlob.
1067    if (!mAllowFds) return FDS_NOT_ALLOWED;
1068    status_t status = writeInt32(BLOB_ASHMEM_IMMUTABLE);
1069    if (status) return status;
1070    return writeDupFileDescriptor(fd);
1071}
1072
1073status_t Parcel::write(const FlattenableHelperInterface& val)
1074{
1075    status_t err;
1076
1077    // size if needed
1078    const size_t len = val.getFlattenedSize();
1079    const size_t fd_count = val.getFdCount();
1080
1081    if ((len > INT32_MAX) || (fd_count > INT32_MAX)) {
1082        // don't accept size_t values which may have come from an
1083        // inadvertent conversion from a negative int.
1084        return BAD_VALUE;
1085    }
1086
1087    err = this->writeInt32(len);
1088    if (err) return err;
1089
1090    err = this->writeInt32(fd_count);
1091    if (err) return err;
1092
1093    // payload
1094    void* const buf = this->writeInplace(pad_size(len));
1095    if (buf == NULL)
1096        return BAD_VALUE;
1097
1098    int* fds = NULL;
1099    if (fd_count) {
1100        fds = new int[fd_count];
1101    }
1102
1103    err = val.flatten(buf, len, fds, fd_count);
1104    for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) {
1105        err = this->writeDupFileDescriptor( fds[i] );
1106    }
1107
1108    if (fd_count) {
1109        delete [] fds;
1110    }
1111
1112    return err;
1113}
1114
1115status_t Parcel::writeObject(const flat_binder_object& val, bool nullMetaData)
1116{
1117    const bool enoughData = (mDataPos+sizeof(val)) <= mDataCapacity;
1118    const bool enoughObjects = mObjectsSize < mObjectsCapacity;
1119    if (enoughData && enoughObjects) {
1120restart_write:
1121        *reinterpret_cast<flat_binder_object*>(mData+mDataPos) = val;
1122
1123        // remember if it's a file descriptor
1124        if (val.type == BINDER_TYPE_FD) {
1125            if (!mAllowFds) {
1126                // fail before modifying our object index
1127                return FDS_NOT_ALLOWED;
1128            }
1129            mHasFds = mFdsKnown = true;
1130        }
1131
1132        // Need to write meta-data?
1133        if (nullMetaData || val.binder != 0) {
1134            mObjects[mObjectsSize] = mDataPos;
1135            acquire_object(ProcessState::self(), val, this, &mOpenAshmemSize);
1136            mObjectsSize++;
1137        }
1138
1139        return finishWrite(sizeof(flat_binder_object));
1140    }
1141
1142    if (!enoughData) {
1143        const status_t err = growData(sizeof(val));
1144        if (err != NO_ERROR) return err;
1145    }
1146    if (!enoughObjects) {
1147        size_t newSize = ((mObjectsSize+2)*3)/2;
1148        if (newSize < mObjectsSize) return NO_MEMORY;   // overflow
1149        binder_size_t* objects = (binder_size_t*)realloc(mObjects, newSize*sizeof(binder_size_t));
1150        if (objects == NULL) return NO_MEMORY;
1151        mObjects = objects;
1152        mObjectsCapacity = newSize;
1153    }
1154
1155    goto restart_write;
1156}
1157
1158status_t Parcel::writeNoException()
1159{
1160    binder::Status status;
1161    return status.writeToParcel(this);
1162}
1163
1164void Parcel::remove(size_t /*start*/, size_t /*amt*/)
1165{
1166    LOG_ALWAYS_FATAL("Parcel::remove() not yet implemented!");
1167}
1168
1169status_t Parcel::read(void* outData, size_t len) const
1170{
1171    if (len > INT32_MAX) {
1172        // don't accept size_t values which may have come from an
1173        // inadvertent conversion from a negative int.
1174        return BAD_VALUE;
1175    }
1176
1177    if ((mDataPos+pad_size(len)) >= mDataPos && (mDataPos+pad_size(len)) <= mDataSize
1178            && len <= pad_size(len)) {
1179        memcpy(outData, mData+mDataPos, len);
1180        mDataPos += pad_size(len);
1181        ALOGV("read Setting data pos of %p to %zu", this, mDataPos);
1182        return NO_ERROR;
1183    }
1184    return NOT_ENOUGH_DATA;
1185}
1186
1187const void* Parcel::readInplace(size_t len) const
1188{
1189    if (len > INT32_MAX) {
1190        // don't accept size_t values which may have come from an
1191        // inadvertent conversion from a negative int.
1192        return NULL;
1193    }
1194
1195    if ((mDataPos+pad_size(len)) >= mDataPos && (mDataPos+pad_size(len)) <= mDataSize
1196            && len <= pad_size(len)) {
1197        const void* data = mData+mDataPos;
1198        mDataPos += pad_size(len);
1199        ALOGV("readInplace Setting data pos of %p to %zu", this, mDataPos);
1200        return data;
1201    }
1202    return NULL;
1203}
1204
1205template<class T>
1206status_t Parcel::readAligned(T *pArg) const {
1207    COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE_UNSAFE(sizeof(T)) == sizeof(T));
1208
1209    if ((mDataPos+sizeof(T)) <= mDataSize) {
1210        const void* data = mData+mDataPos;
1211        mDataPos += sizeof(T);
1212        *pArg =  *reinterpret_cast<const T*>(data);
1213        return NO_ERROR;
1214    } else {
1215        return NOT_ENOUGH_DATA;
1216    }
1217}
1218
1219template<class T>
1220T Parcel::readAligned() const {
1221    T result;
1222    if (readAligned(&result) != NO_ERROR) {
1223        result = 0;
1224    }
1225
1226    return result;
1227}
1228
1229template<class T>
1230status_t Parcel::writeAligned(T val) {
1231    COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE_UNSAFE(sizeof(T)) == sizeof(T));
1232
1233    if ((mDataPos+sizeof(val)) <= mDataCapacity) {
1234restart_write:
1235        *reinterpret_cast<T*>(mData+mDataPos) = val;
1236        return finishWrite(sizeof(val));
1237    }
1238
1239    status_t err = growData(sizeof(val));
1240    if (err == NO_ERROR) goto restart_write;
1241    return err;
1242}
1243
1244status_t Parcel::readByteVector(std::vector<int8_t>* val) const {
1245    val->clear();
1246
1247    int32_t size;
1248    status_t status = readInt32(&size);
1249
1250    if (status != OK) {
1251        return status;
1252    }
1253
1254    if (size < 0) {
1255        status = UNEXPECTED_NULL;
1256        return status;
1257    }
1258    if (size_t(size) > dataAvail()) {
1259        status = BAD_VALUE;
1260        return status;
1261    }
1262
1263    const void* data = readInplace(size);
1264    if (!data) {
1265        status = BAD_VALUE;
1266        return status;
1267    }
1268    val->resize(size);
1269    memcpy(val->data(), data, size);
1270
1271    return status;
1272}
1273
1274status_t Parcel::readInt32Vector(std::vector<int32_t>* val) const {
1275    return readTypedVector(val, &Parcel::readInt32);
1276}
1277
1278status_t Parcel::readInt64Vector(std::vector<int64_t>* val) const {
1279    return readTypedVector(val, &Parcel::readInt64);
1280}
1281
1282status_t Parcel::readFloatVector(std::vector<float>* val) const {
1283    return readTypedVector(val, &Parcel::readFloat);
1284}
1285
1286status_t Parcel::readDoubleVector(std::vector<double>* val) const {
1287    return readTypedVector(val, &Parcel::readDouble);
1288}
1289
1290status_t Parcel::readBoolVector(std::vector<bool>* val) const {
1291    val->clear();
1292
1293    int32_t size;
1294    status_t status = readInt32(&size);
1295
1296    if (status != OK) {
1297        return status;
1298    }
1299
1300    if (size < 0) {
1301        return UNEXPECTED_NULL;
1302    }
1303
1304    val->resize(size);
1305
1306    /* C++ bool handling means a vector of bools isn't necessarily addressable
1307     * (we might use individual bits)
1308     */
1309    bool data;
1310    for (int32_t i = 0; i < size; ++i) {
1311        status = readBool(&data);
1312        (*val)[i] = data;
1313
1314        if (status != OK) {
1315            return status;
1316        }
1317    }
1318
1319    return OK;
1320}
1321
1322status_t Parcel::readCharVector(std::vector<char16_t>* val) const {
1323    return readTypedVector(val, &Parcel::readChar);
1324}
1325
1326status_t Parcel::readString16Vector(std::vector<String16>* val) const {
1327    return readTypedVector(val, &Parcel::readString16);
1328}
1329
1330
1331status_t Parcel::readInt32(int32_t *pArg) const
1332{
1333    return readAligned(pArg);
1334}
1335
1336int32_t Parcel::readInt32() const
1337{
1338    return readAligned<int32_t>();
1339}
1340
1341status_t Parcel::readUint32(uint32_t *pArg) const
1342{
1343    return readAligned(pArg);
1344}
1345
1346uint32_t Parcel::readUint32() const
1347{
1348    return readAligned<uint32_t>();
1349}
1350
1351status_t Parcel::readInt64(int64_t *pArg) const
1352{
1353    return readAligned(pArg);
1354}
1355
1356
1357int64_t Parcel::readInt64() const
1358{
1359    return readAligned<int64_t>();
1360}
1361
1362status_t Parcel::readUint64(uint64_t *pArg) const
1363{
1364    return readAligned(pArg);
1365}
1366
1367uint64_t Parcel::readUint64() const
1368{
1369    return readAligned<uint64_t>();
1370}
1371
1372status_t Parcel::readPointer(uintptr_t *pArg) const
1373{
1374    status_t ret;
1375    binder_uintptr_t ptr;
1376    ret = readAligned(&ptr);
1377    if (!ret)
1378        *pArg = ptr;
1379    return ret;
1380}
1381
1382uintptr_t Parcel::readPointer() const
1383{
1384    return readAligned<binder_uintptr_t>();
1385}
1386
1387
1388status_t Parcel::readFloat(float *pArg) const
1389{
1390    return readAligned(pArg);
1391}
1392
1393
1394float Parcel::readFloat() const
1395{
1396    return readAligned<float>();
1397}
1398
1399#if defined(__mips__) && defined(__mips_hard_float)
1400
1401status_t Parcel::readDouble(double *pArg) const
1402{
1403    union {
1404      double d;
1405      unsigned long long ll;
1406    } u;
1407    u.d = 0;
1408    status_t status;
1409    status = readAligned(&u.ll);
1410    *pArg = u.d;
1411    return status;
1412}
1413
1414double Parcel::readDouble() const
1415{
1416    union {
1417      double d;
1418      unsigned long long ll;
1419    } u;
1420    u.ll = readAligned<unsigned long long>();
1421    return u.d;
1422}
1423
1424#else
1425
1426status_t Parcel::readDouble(double *pArg) const
1427{
1428    return readAligned(pArg);
1429}
1430
1431double Parcel::readDouble() const
1432{
1433    return readAligned<double>();
1434}
1435
1436#endif
1437
1438status_t Parcel::readIntPtr(intptr_t *pArg) const
1439{
1440    return readAligned(pArg);
1441}
1442
1443
1444intptr_t Parcel::readIntPtr() const
1445{
1446    return readAligned<intptr_t>();
1447}
1448
1449status_t Parcel::readBool(bool *pArg) const
1450{
1451    int32_t tmp;
1452    status_t ret = readInt32(&tmp);
1453    *pArg = (tmp != 0);
1454    return ret;
1455}
1456
1457bool Parcel::readBool() const
1458{
1459    return readInt32() != 0;
1460}
1461
1462status_t Parcel::readChar(char16_t *pArg) const
1463{
1464    int32_t tmp;
1465    status_t ret = readInt32(&tmp);
1466    *pArg = char16_t(tmp);
1467    return ret;
1468}
1469
1470char16_t Parcel::readChar() const
1471{
1472    return char16_t(readInt32());
1473}
1474
1475status_t Parcel::readByte(int8_t *pArg) const
1476{
1477    int32_t tmp;
1478    status_t ret = readInt32(&tmp);
1479    *pArg = int8_t(tmp);
1480    return ret;
1481}
1482
1483int8_t Parcel::readByte() const
1484{
1485    return int8_t(readInt32());
1486}
1487
1488const char* Parcel::readCString() const
1489{
1490    const size_t avail = mDataSize-mDataPos;
1491    if (avail > 0) {
1492        const char* str = reinterpret_cast<const char*>(mData+mDataPos);
1493        // is the string's trailing NUL within the parcel's valid bounds?
1494        const char* eos = reinterpret_cast<const char*>(memchr(str, 0, avail));
1495        if (eos) {
1496            const size_t len = eos - str;
1497            mDataPos += pad_size(len+1);
1498            ALOGV("readCString Setting data pos of %p to %zu", this, mDataPos);
1499            return str;
1500        }
1501    }
1502    return NULL;
1503}
1504
1505String8 Parcel::readString8() const
1506{
1507    int32_t size = readInt32();
1508    // watch for potential int overflow adding 1 for trailing NUL
1509    if (size > 0 && size < INT32_MAX) {
1510        const char* str = (const char*)readInplace(size+1);
1511        if (str) return String8(str, size);
1512    }
1513    return String8();
1514}
1515
1516String16 Parcel::readString16() const
1517{
1518    size_t len;
1519    const char16_t* str = readString16Inplace(&len);
1520    if (str) return String16(str, len);
1521    ALOGE("Reading a NULL string not supported here.");
1522    return String16();
1523}
1524
1525status_t Parcel::readString16(String16* pArg) const
1526{
1527    size_t len;
1528    const char16_t* str = readString16Inplace(&len);
1529    if (str) {
1530        pArg->setTo(str, len);
1531        return 0;
1532    } else {
1533        *pArg = String16();
1534        return UNEXPECTED_NULL;
1535    }
1536}
1537
1538const char16_t* Parcel::readString16Inplace(size_t* outLen) const
1539{
1540    int32_t size = readInt32();
1541    // watch for potential int overflow from size+1
1542    if (size >= 0 && size < INT32_MAX) {
1543        *outLen = size;
1544        const char16_t* str = (const char16_t*)readInplace((size+1)*sizeof(char16_t));
1545        if (str != NULL) {
1546            return str;
1547        }
1548    }
1549    *outLen = 0;
1550    return NULL;
1551}
1552
1553status_t Parcel::readStrongBinder(sp<IBinder>* val) const
1554{
1555    return unflatten_binder(ProcessState::self(), *this, val);
1556}
1557
1558sp<IBinder> Parcel::readStrongBinder() const
1559{
1560    sp<IBinder> val;
1561    readStrongBinder(&val);
1562    return val;
1563}
1564
1565wp<IBinder> Parcel::readWeakBinder() const
1566{
1567    wp<IBinder> val;
1568    unflatten_binder(ProcessState::self(), *this, &val);
1569    return val;
1570}
1571
1572int32_t Parcel::readExceptionCode() const
1573{
1574    binder::Status status;
1575    status.readFromParcel(*this);
1576    return status.exceptionCode();
1577}
1578
1579native_handle* Parcel::readNativeHandle() const
1580{
1581    int numFds, numInts;
1582    status_t err;
1583    err = readInt32(&numFds);
1584    if (err != NO_ERROR) return 0;
1585    err = readInt32(&numInts);
1586    if (err != NO_ERROR) return 0;
1587
1588    native_handle* h = native_handle_create(numFds, numInts);
1589    if (!h) {
1590        return 0;
1591    }
1592
1593    for (int i=0 ; err==NO_ERROR && i<numFds ; i++) {
1594        h->data[i] = dup(readFileDescriptor());
1595        if (h->data[i] < 0) err = BAD_VALUE;
1596    }
1597    err = read(h->data + numFds, sizeof(int)*numInts);
1598    if (err != NO_ERROR) {
1599        native_handle_close(h);
1600        native_handle_delete(h);
1601        h = 0;
1602    }
1603    return h;
1604}
1605
1606
1607int Parcel::readFileDescriptor() const
1608{
1609    const flat_binder_object* flat = readObject(true);
1610    if (flat) {
1611        switch (flat->type) {
1612            case BINDER_TYPE_FD:
1613                //ALOGI("Returning file descriptor %ld from parcel %p", flat->handle, this);
1614                return flat->handle;
1615        }
1616    }
1617    return BAD_TYPE;
1618}
1619
1620status_t Parcel::readBlob(size_t len, ReadableBlob* outBlob) const
1621{
1622    int32_t blobType;
1623    status_t status = readInt32(&blobType);
1624    if (status) return status;
1625
1626    if (blobType == BLOB_INPLACE) {
1627        ALOGV("readBlob: read in place");
1628        const void* ptr = readInplace(len);
1629        if (!ptr) return BAD_VALUE;
1630
1631        outBlob->init(-1, const_cast<void*>(ptr), len, false);
1632        return NO_ERROR;
1633    }
1634
1635    ALOGV("readBlob: read from ashmem");
1636    bool isMutable = (blobType == BLOB_ASHMEM_MUTABLE);
1637    int fd = readFileDescriptor();
1638    if (fd == int(BAD_TYPE)) return BAD_VALUE;
1639
1640    void* ptr = ::mmap(NULL, len, isMutable ? PROT_READ | PROT_WRITE : PROT_READ,
1641            MAP_SHARED, fd, 0);
1642    if (ptr == MAP_FAILED) return NO_MEMORY;
1643
1644    outBlob->init(fd, ptr, len, isMutable);
1645    return NO_ERROR;
1646}
1647
1648status_t Parcel::read(FlattenableHelperInterface& val) const
1649{
1650    // size
1651    const size_t len = this->readInt32();
1652    const size_t fd_count = this->readInt32();
1653
1654    if (len > INT32_MAX) {
1655        // don't accept size_t values which may have come from an
1656        // inadvertent conversion from a negative int.
1657        return BAD_VALUE;
1658    }
1659
1660    // payload
1661    void const* const buf = this->readInplace(pad_size(len));
1662    if (buf == NULL)
1663        return BAD_VALUE;
1664
1665    int* fds = NULL;
1666    if (fd_count) {
1667        fds = new int[fd_count];
1668    }
1669
1670    status_t err = NO_ERROR;
1671    for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) {
1672        fds[i] = dup(this->readFileDescriptor());
1673        if (fds[i] < 0) {
1674            err = BAD_VALUE;
1675            ALOGE("dup() failed in Parcel::read, i is %zu, fds[i] is %d, fd_count is %zu, error: %s",
1676                i, fds[i], fd_count, strerror(errno));
1677        }
1678    }
1679
1680    if (err == NO_ERROR) {
1681        err = val.unflatten(buf, len, fds, fd_count);
1682    }
1683
1684    if (fd_count) {
1685        delete [] fds;
1686    }
1687
1688    return err;
1689}
1690const flat_binder_object* Parcel::readObject(bool nullMetaData) const
1691{
1692    const size_t DPOS = mDataPos;
1693    if ((DPOS+sizeof(flat_binder_object)) <= mDataSize) {
1694        const flat_binder_object* obj
1695                = reinterpret_cast<const flat_binder_object*>(mData+DPOS);
1696        mDataPos = DPOS + sizeof(flat_binder_object);
1697        if (!nullMetaData && (obj->cookie == 0 && obj->binder == 0)) {
1698            // When transferring a NULL object, we don't write it into
1699            // the object list, so we don't want to check for it when
1700            // reading.
1701            ALOGV("readObject Setting data pos of %p to %zu", this, mDataPos);
1702            return obj;
1703        }
1704
1705        // Ensure that this object is valid...
1706        binder_size_t* const OBJS = mObjects;
1707        const size_t N = mObjectsSize;
1708        size_t opos = mNextObjectHint;
1709
1710        if (N > 0) {
1711            ALOGV("Parcel %p looking for obj at %zu, hint=%zu",
1712                 this, DPOS, opos);
1713
1714            // Start at the current hint position, looking for an object at
1715            // the current data position.
1716            if (opos < N) {
1717                while (opos < (N-1) && OBJS[opos] < DPOS) {
1718                    opos++;
1719                }
1720            } else {
1721                opos = N-1;
1722            }
1723            if (OBJS[opos] == DPOS) {
1724                // Found it!
1725                ALOGV("Parcel %p found obj %zu at index %zu with forward search",
1726                     this, DPOS, opos);
1727                mNextObjectHint = opos+1;
1728                ALOGV("readObject Setting data pos of %p to %zu", this, mDataPos);
1729                return obj;
1730            }
1731
1732            // Look backwards for it...
1733            while (opos > 0 && OBJS[opos] > DPOS) {
1734                opos--;
1735            }
1736            if (OBJS[opos] == DPOS) {
1737                // Found it!
1738                ALOGV("Parcel %p found obj %zu at index %zu with backward search",
1739                     this, DPOS, opos);
1740                mNextObjectHint = opos+1;
1741                ALOGV("readObject Setting data pos of %p to %zu", this, mDataPos);
1742                return obj;
1743            }
1744        }
1745        ALOGW("Attempt to read object from Parcel %p at offset %zu that is not in the object list",
1746             this, DPOS);
1747    }
1748    return NULL;
1749}
1750
1751void Parcel::closeFileDescriptors()
1752{
1753    size_t i = mObjectsSize;
1754    if (i > 0) {
1755        //ALOGI("Closing file descriptors for %zu objects...", i);
1756    }
1757    while (i > 0) {
1758        i--;
1759        const flat_binder_object* flat
1760            = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]);
1761        if (flat->type == BINDER_TYPE_FD) {
1762            //ALOGI("Closing fd: %ld", flat->handle);
1763            close(flat->handle);
1764        }
1765    }
1766}
1767
1768uintptr_t Parcel::ipcData() const
1769{
1770    return reinterpret_cast<uintptr_t>(mData);
1771}
1772
1773size_t Parcel::ipcDataSize() const
1774{
1775    return (mDataSize > mDataPos ? mDataSize : mDataPos);
1776}
1777
1778uintptr_t Parcel::ipcObjects() const
1779{
1780    return reinterpret_cast<uintptr_t>(mObjects);
1781}
1782
1783size_t Parcel::ipcObjectsCount() const
1784{
1785    return mObjectsSize;
1786}
1787
1788void Parcel::ipcSetDataReference(const uint8_t* data, size_t dataSize,
1789    const binder_size_t* objects, size_t objectsCount, release_func relFunc, void* relCookie)
1790{
1791    binder_size_t minOffset = 0;
1792    freeDataNoInit();
1793    mError = NO_ERROR;
1794    mData = const_cast<uint8_t*>(data);
1795    mDataSize = mDataCapacity = dataSize;
1796    //ALOGI("setDataReference Setting data size of %p to %lu (pid=%d)", this, mDataSize, getpid());
1797    mDataPos = 0;
1798    ALOGV("setDataReference Setting data pos of %p to %zu", this, mDataPos);
1799    mObjects = const_cast<binder_size_t*>(objects);
1800    mObjectsSize = mObjectsCapacity = objectsCount;
1801    mNextObjectHint = 0;
1802    mOwner = relFunc;
1803    mOwnerCookie = relCookie;
1804    for (size_t i = 0; i < mObjectsSize; i++) {
1805        binder_size_t offset = mObjects[i];
1806        if (offset < minOffset) {
1807            ALOGE("%s: bad object offset %" PRIu64 " < %" PRIu64 "\n",
1808                  __func__, (uint64_t)offset, (uint64_t)minOffset);
1809            mObjectsSize = 0;
1810            break;
1811        }
1812        minOffset = offset + sizeof(flat_binder_object);
1813    }
1814    scanForFds();
1815}
1816
1817void Parcel::print(TextOutput& to, uint32_t /*flags*/) const
1818{
1819    to << "Parcel(";
1820
1821    if (errorCheck() != NO_ERROR) {
1822        const status_t err = errorCheck();
1823        to << "Error: " << (void*)(intptr_t)err << " \"" << strerror(-err) << "\"";
1824    } else if (dataSize() > 0) {
1825        const uint8_t* DATA = data();
1826        to << indent << HexDump(DATA, dataSize()) << dedent;
1827        const binder_size_t* OBJS = objects();
1828        const size_t N = objectsCount();
1829        for (size_t i=0; i<N; i++) {
1830            const flat_binder_object* flat
1831                = reinterpret_cast<const flat_binder_object*>(DATA+OBJS[i]);
1832            to << endl << "Object #" << i << " @ " << (void*)OBJS[i] << ": "
1833                << TypeCode(flat->type & 0x7f7f7f00)
1834                << " = " << flat->binder;
1835        }
1836    } else {
1837        to << "NULL";
1838    }
1839
1840    to << ")";
1841}
1842
1843void Parcel::releaseObjects()
1844{
1845    const sp<ProcessState> proc(ProcessState::self());
1846    size_t i = mObjectsSize;
1847    uint8_t* const data = mData;
1848    binder_size_t* const objects = mObjects;
1849    while (i > 0) {
1850        i--;
1851        const flat_binder_object* flat
1852            = reinterpret_cast<flat_binder_object*>(data+objects[i]);
1853        release_object(proc, *flat, this, &mOpenAshmemSize);
1854    }
1855}
1856
1857void Parcel::acquireObjects()
1858{
1859    const sp<ProcessState> proc(ProcessState::self());
1860    size_t i = mObjectsSize;
1861    uint8_t* const data = mData;
1862    binder_size_t* const objects = mObjects;
1863    while (i > 0) {
1864        i--;
1865        const flat_binder_object* flat
1866            = reinterpret_cast<flat_binder_object*>(data+objects[i]);
1867        acquire_object(proc, *flat, this, &mOpenAshmemSize);
1868    }
1869}
1870
1871void Parcel::freeData()
1872{
1873    freeDataNoInit();
1874    initState();
1875}
1876
1877void Parcel::freeDataNoInit()
1878{
1879    if (mOwner) {
1880        LOG_ALLOC("Parcel %p: freeing other owner data", this);
1881        //ALOGI("Freeing data ref of %p (pid=%d)", this, getpid());
1882        mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie);
1883    } else {
1884        LOG_ALLOC("Parcel %p: freeing allocated data", this);
1885        releaseObjects();
1886        if (mData) {
1887            LOG_ALLOC("Parcel %p: freeing with %zu capacity", this, mDataCapacity);
1888            pthread_mutex_lock(&gParcelGlobalAllocSizeLock);
1889            if (mDataCapacity <= gParcelGlobalAllocSize) {
1890              gParcelGlobalAllocSize = gParcelGlobalAllocSize - mDataCapacity;
1891            } else {
1892              gParcelGlobalAllocSize = 0;
1893            }
1894            if (gParcelGlobalAllocCount > 0) {
1895              gParcelGlobalAllocCount--;
1896            }
1897            pthread_mutex_unlock(&gParcelGlobalAllocSizeLock);
1898            free(mData);
1899        }
1900        if (mObjects) free(mObjects);
1901    }
1902}
1903
1904status_t Parcel::growData(size_t len)
1905{
1906    if (len > INT32_MAX) {
1907        // don't accept size_t values which may have come from an
1908        // inadvertent conversion from a negative int.
1909        return BAD_VALUE;
1910    }
1911
1912    size_t newSize = ((mDataSize+len)*3)/2;
1913    return (newSize <= mDataSize)
1914            ? (status_t) NO_MEMORY
1915            : continueWrite(newSize);
1916}
1917
1918status_t Parcel::restartWrite(size_t desired)
1919{
1920    if (desired > INT32_MAX) {
1921        // don't accept size_t values which may have come from an
1922        // inadvertent conversion from a negative int.
1923        return BAD_VALUE;
1924    }
1925
1926    if (mOwner) {
1927        freeData();
1928        return continueWrite(desired);
1929    }
1930
1931    uint8_t* data = (uint8_t*)realloc(mData, desired);
1932    if (!data && desired > mDataCapacity) {
1933        mError = NO_MEMORY;
1934        return NO_MEMORY;
1935    }
1936
1937    releaseObjects();
1938
1939    if (data) {
1940        LOG_ALLOC("Parcel %p: restart from %zu to %zu capacity", this, mDataCapacity, desired);
1941        pthread_mutex_lock(&gParcelGlobalAllocSizeLock);
1942        gParcelGlobalAllocSize += desired;
1943        gParcelGlobalAllocSize -= mDataCapacity;
1944        pthread_mutex_unlock(&gParcelGlobalAllocSizeLock);
1945        mData = data;
1946        mDataCapacity = desired;
1947    }
1948
1949    mDataSize = mDataPos = 0;
1950    ALOGV("restartWrite Setting data size of %p to %zu", this, mDataSize);
1951    ALOGV("restartWrite Setting data pos of %p to %zu", this, mDataPos);
1952
1953    free(mObjects);
1954    mObjects = NULL;
1955    mObjectsSize = mObjectsCapacity = 0;
1956    mNextObjectHint = 0;
1957    mHasFds = false;
1958    mFdsKnown = true;
1959    mAllowFds = true;
1960
1961    return NO_ERROR;
1962}
1963
1964status_t Parcel::continueWrite(size_t desired)
1965{
1966    if (desired > INT32_MAX) {
1967        // don't accept size_t values which may have come from an
1968        // inadvertent conversion from a negative int.
1969        return BAD_VALUE;
1970    }
1971
1972    // If shrinking, first adjust for any objects that appear
1973    // after the new data size.
1974    size_t objectsSize = mObjectsSize;
1975    if (desired < mDataSize) {
1976        if (desired == 0) {
1977            objectsSize = 0;
1978        } else {
1979            while (objectsSize > 0) {
1980                if (mObjects[objectsSize-1] < desired)
1981                    break;
1982                objectsSize--;
1983            }
1984        }
1985    }
1986
1987    if (mOwner) {
1988        // If the size is going to zero, just release the owner's data.
1989        if (desired == 0) {
1990            freeData();
1991            return NO_ERROR;
1992        }
1993
1994        // If there is a different owner, we need to take
1995        // posession.
1996        uint8_t* data = (uint8_t*)malloc(desired);
1997        if (!data) {
1998            mError = NO_MEMORY;
1999            return NO_MEMORY;
2000        }
2001        binder_size_t* objects = NULL;
2002
2003        if (objectsSize) {
2004            objects = (binder_size_t*)calloc(objectsSize, sizeof(binder_size_t));
2005            if (!objects) {
2006                free(data);
2007
2008                mError = NO_MEMORY;
2009                return NO_MEMORY;
2010            }
2011
2012            // Little hack to only acquire references on objects
2013            // we will be keeping.
2014            size_t oldObjectsSize = mObjectsSize;
2015            mObjectsSize = objectsSize;
2016            acquireObjects();
2017            mObjectsSize = oldObjectsSize;
2018        }
2019
2020        if (mData) {
2021            memcpy(data, mData, mDataSize < desired ? mDataSize : desired);
2022        }
2023        if (objects && mObjects) {
2024            memcpy(objects, mObjects, objectsSize*sizeof(binder_size_t));
2025        }
2026        //ALOGI("Freeing data ref of %p (pid=%d)", this, getpid());
2027        mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie);
2028        mOwner = NULL;
2029
2030        LOG_ALLOC("Parcel %p: taking ownership of %zu capacity", this, desired);
2031        pthread_mutex_lock(&gParcelGlobalAllocSizeLock);
2032        gParcelGlobalAllocSize += desired;
2033        gParcelGlobalAllocCount++;
2034        pthread_mutex_unlock(&gParcelGlobalAllocSizeLock);
2035
2036        mData = data;
2037        mObjects = objects;
2038        mDataSize = (mDataSize < desired) ? mDataSize : desired;
2039        ALOGV("continueWrite Setting data size of %p to %zu", this, mDataSize);
2040        mDataCapacity = desired;
2041        mObjectsSize = mObjectsCapacity = objectsSize;
2042        mNextObjectHint = 0;
2043
2044    } else if (mData) {
2045        if (objectsSize < mObjectsSize) {
2046            // Need to release refs on any objects we are dropping.
2047            const sp<ProcessState> proc(ProcessState::self());
2048            for (size_t i=objectsSize; i<mObjectsSize; i++) {
2049                const flat_binder_object* flat
2050                    = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]);
2051                if (flat->type == BINDER_TYPE_FD) {
2052                    // will need to rescan because we may have lopped off the only FDs
2053                    mFdsKnown = false;
2054                }
2055                release_object(proc, *flat, this, &mOpenAshmemSize);
2056            }
2057            binder_size_t* objects =
2058                (binder_size_t*)realloc(mObjects, objectsSize*sizeof(binder_size_t));
2059            if (objects) {
2060                mObjects = objects;
2061            }
2062            mObjectsSize = objectsSize;
2063            mNextObjectHint = 0;
2064        }
2065
2066        // We own the data, so we can just do a realloc().
2067        if (desired > mDataCapacity) {
2068            uint8_t* data = (uint8_t*)realloc(mData, desired);
2069            if (data) {
2070                LOG_ALLOC("Parcel %p: continue from %zu to %zu capacity", this, mDataCapacity,
2071                        desired);
2072                pthread_mutex_lock(&gParcelGlobalAllocSizeLock);
2073                gParcelGlobalAllocSize += desired;
2074                gParcelGlobalAllocSize -= mDataCapacity;
2075                gParcelGlobalAllocCount++;
2076                pthread_mutex_unlock(&gParcelGlobalAllocSizeLock);
2077                mData = data;
2078                mDataCapacity = desired;
2079            } else if (desired > mDataCapacity) {
2080                mError = NO_MEMORY;
2081                return NO_MEMORY;
2082            }
2083        } else {
2084            if (mDataSize > desired) {
2085                mDataSize = desired;
2086                ALOGV("continueWrite Setting data size of %p to %zu", this, mDataSize);
2087            }
2088            if (mDataPos > desired) {
2089                mDataPos = desired;
2090                ALOGV("continueWrite Setting data pos of %p to %zu", this, mDataPos);
2091            }
2092        }
2093
2094    } else {
2095        // This is the first data.  Easy!
2096        uint8_t* data = (uint8_t*)malloc(desired);
2097        if (!data) {
2098            mError = NO_MEMORY;
2099            return NO_MEMORY;
2100        }
2101
2102        if(!(mDataCapacity == 0 && mObjects == NULL
2103             && mObjectsCapacity == 0)) {
2104            ALOGE("continueWrite: %zu/%p/%zu/%zu", mDataCapacity, mObjects, mObjectsCapacity, desired);
2105        }
2106
2107        LOG_ALLOC("Parcel %p: allocating with %zu capacity", this, desired);
2108        pthread_mutex_lock(&gParcelGlobalAllocSizeLock);
2109        gParcelGlobalAllocSize += desired;
2110        gParcelGlobalAllocCount++;
2111        pthread_mutex_unlock(&gParcelGlobalAllocSizeLock);
2112
2113        mData = data;
2114        mDataSize = mDataPos = 0;
2115        ALOGV("continueWrite Setting data size of %p to %zu", this, mDataSize);
2116        ALOGV("continueWrite Setting data pos of %p to %zu", this, mDataPos);
2117        mDataCapacity = desired;
2118    }
2119
2120    return NO_ERROR;
2121}
2122
2123void Parcel::initState()
2124{
2125    LOG_ALLOC("Parcel %p: initState", this);
2126    mError = NO_ERROR;
2127    mData = 0;
2128    mDataSize = 0;
2129    mDataCapacity = 0;
2130    mDataPos = 0;
2131    ALOGV("initState Setting data size of %p to %zu", this, mDataSize);
2132    ALOGV("initState Setting data pos of %p to %zu", this, mDataPos);
2133    mObjects = NULL;
2134    mObjectsSize = 0;
2135    mObjectsCapacity = 0;
2136    mNextObjectHint = 0;
2137    mHasFds = false;
2138    mFdsKnown = true;
2139    mAllowFds = true;
2140    mOwner = NULL;
2141    mOpenAshmemSize = 0;
2142}
2143
2144void Parcel::scanForFds() const
2145{
2146    bool hasFds = false;
2147    for (size_t i=0; i<mObjectsSize; i++) {
2148        const flat_binder_object* flat
2149            = reinterpret_cast<const flat_binder_object*>(mData + mObjects[i]);
2150        if (flat->type == BINDER_TYPE_FD) {
2151            hasFds = true;
2152            break;
2153        }
2154    }
2155    mHasFds = hasFds;
2156    mFdsKnown = true;
2157}
2158
2159size_t Parcel::getBlobAshmemSize() const
2160{
2161    // This used to return the size of all blobs that were written to ashmem, now we're returning
2162    // the ashmem currently referenced by this Parcel, which should be equivalent.
2163    // TODO: Remove method once ABI can be changed.
2164    return mOpenAshmemSize;
2165}
2166
2167size_t Parcel::getOpenAshmemSize() const
2168{
2169    return mOpenAshmemSize;
2170}
2171
2172// --- Parcel::Blob ---
2173
2174Parcel::Blob::Blob() :
2175        mFd(-1), mData(NULL), mSize(0), mMutable(false) {
2176}
2177
2178Parcel::Blob::~Blob() {
2179    release();
2180}
2181
2182void Parcel::Blob::release() {
2183    if (mFd != -1 && mData) {
2184        ::munmap(mData, mSize);
2185    }
2186    clear();
2187}
2188
2189void Parcel::Blob::init(int fd, void* data, size_t size, bool isMutable) {
2190    mFd = fd;
2191    mData = data;
2192    mSize = size;
2193    mMutable = isMutable;
2194}
2195
2196void Parcel::Blob::clear() {
2197    mFd = -1;
2198    mData = NULL;
2199    mSize = 0;
2200    mMutable = false;
2201}
2202
2203}; // namespace android
2204