Parcel.cpp revision 2f340be345612d9fc2ecb1ea2a4c9e147610a593 
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/TextOutput.h>
27
28#include <errno.h>
29#include <utils/Debug.h>
30#include <utils/Log.h>
31#include <utils/String8.h>
32#include <utils/String16.h>
33#include <utils/misc.h>
34#include <utils/Flattenable.h>
35#include <cutils/ashmem.h>
36
37#include <private/binder/binder_module.h>
38#include <private/binder/Static.h>
39
40#include <inttypes.h>
41#include <stdio.h>
42#include <stdlib.h>
43#include <stdint.h>
44#include <sys/mman.h>
45
46#ifndef INT32_MAX
47#define INT32_MAX ((int32_t)(2147483647))
48#endif
49
50#define LOG_REFS(...)
51//#define LOG_REFS(...) ALOG(LOG_DEBUG, "Parcel", __VA_ARGS__)
52#define LOG_ALLOC(...)
53//#define LOG_ALLOC(...) ALOG(LOG_DEBUG, "Parcel", __VA_ARGS__)
54
55// ---------------------------------------------------------------------------
56
57#define PAD_SIZE(s) (((s)+3)&~3)
58
59// Note: must be kept in sync with android/os/StrictMode.java's PENALTY_GATHER
60#define STRICT_MODE_PENALTY_GATHER 0x100
61
62// Note: must be kept in sync with android/os/Parcel.java's EX_HAS_REPLY_HEADER
63#define EX_HAS_REPLY_HEADER -128
64
65// Maximum size of a blob to transfer in-place.
66static const size_t IN_PLACE_BLOB_LIMIT = 40 * 1024;
67
68// XXX This can be made public if we want to provide
69// support for typed data.
70struct small_flat_data
71{
72    uint32_t type;
73    uint32_t data;
74};
75
76namespace android {
77
78static pthread_mutex_t gParcelGlobalAllocSizeLock = PTHREAD_MUTEX_INITIALIZER;
79static size_t gParcelGlobalAllocSize = 0;
80static size_t gParcelGlobalAllocCount = 0;
81
82void acquire_object(const sp<ProcessState>& proc,
83    const flat_binder_object& obj, const void* who)
84{
85    switch (obj.type) {
86        case BINDER_TYPE_BINDER:
87            if (obj.binder) {
88                LOG_REFS("Parcel %p acquiring reference on local %p", who, obj.cookie);
89                reinterpret_cast<IBinder*>(obj.cookie)->incStrong(who);
90            }
91            return;
92        case BINDER_TYPE_WEAK_BINDER:
93            if (obj.binder)
94                reinterpret_cast<RefBase::weakref_type*>(obj.binder)->incWeak(who);
95            return;
96        case BINDER_TYPE_HANDLE: {
97            const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle);
98            if (b != NULL) {
99                LOG_REFS("Parcel %p acquiring reference on remote %p", who, b.get());
100                b->incStrong(who);
101            }
102            return;
103        }
104        case BINDER_TYPE_WEAK_HANDLE: {
105            const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle);
106            if (b != NULL) b.get_refs()->incWeak(who);
107            return;
108        }
109        case BINDER_TYPE_FD: {
110            // intentionally blank -- nothing to do to acquire this, but we do
111            // recognize it as a legitimate object type.
112            return;
113        }
114    }
115
116    ALOGD("Invalid object type 0x%08x", obj.type);
117}
118
119void release_object(const sp<ProcessState>& proc,
120    const flat_binder_object& obj, const void* who)
121{
122    switch (obj.type) {
123        case BINDER_TYPE_BINDER:
124            if (obj.binder) {
125                LOG_REFS("Parcel %p releasing reference on local %p", who, obj.cookie);
126                reinterpret_cast<IBinder*>(obj.cookie)->decStrong(who);
127            }
128            return;
129        case BINDER_TYPE_WEAK_BINDER:
130            if (obj.binder)
131                reinterpret_cast<RefBase::weakref_type*>(obj.binder)->decWeak(who);
132            return;
133        case BINDER_TYPE_HANDLE: {
134            const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle);
135            if (b != NULL) {
136                LOG_REFS("Parcel %p releasing reference on remote %p", who, b.get());
137                b->decStrong(who);
138            }
139            return;
140        }
141        case BINDER_TYPE_WEAK_HANDLE: {
142            const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle);
143            if (b != NULL) b.get_refs()->decWeak(who);
144            return;
145        }
146        case BINDER_TYPE_FD: {
147            if (obj.cookie != 0) close(obj.handle);
148            return;
149        }
150    }
151
152    ALOGE("Invalid object type 0x%08x", obj.type);
153}
154
155inline static status_t finish_flatten_binder(
156    const sp<IBinder>& /*binder*/, const flat_binder_object& flat, Parcel* out)
157{
158    return out->writeObject(flat, false);
159}
160
161status_t flatten_binder(const sp<ProcessState>& /*proc*/,
162    const sp<IBinder>& binder, Parcel* out)
163{
164    flat_binder_object obj;
165
166    obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS;
167    if (binder != NULL) {
168        IBinder *local = binder->localBinder();
169        if (!local) {
170            BpBinder *proxy = binder->remoteBinder();
171            if (proxy == NULL) {
172                ALOGE("null proxy");
173            }
174            const int32_t handle = proxy ? proxy->handle() : 0;
175            obj.type = BINDER_TYPE_HANDLE;
176            obj.binder = 0; /* Don't pass uninitialized stack data to a remote process */
177            obj.handle = handle;
178            obj.cookie = 0;
179        } else {
180            obj.type = BINDER_TYPE_BINDER;
181            obj.binder = reinterpret_cast<uintptr_t>(local->getWeakRefs());
182            obj.cookie = reinterpret_cast<uintptr_t>(local);
183        }
184    } else {
185        obj.type = BINDER_TYPE_BINDER;
186        obj.binder = 0;
187        obj.cookie = 0;
188    }
189
190    return finish_flatten_binder(binder, obj, out);
191}
192
193status_t flatten_binder(const sp<ProcessState>& /*proc*/,
194    const wp<IBinder>& binder, Parcel* out)
195{
196    flat_binder_object obj;
197
198    obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS;
199    if (binder != NULL) {
200        sp<IBinder> real = binder.promote();
201        if (real != NULL) {
202            IBinder *local = real->localBinder();
203            if (!local) {
204                BpBinder *proxy = real->remoteBinder();
205                if (proxy == NULL) {
206                    ALOGE("null proxy");
207                }
208                const int32_t handle = proxy ? proxy->handle() : 0;
209                obj.type = BINDER_TYPE_WEAK_HANDLE;
210                obj.binder = 0; /* Don't pass uninitialized stack data to a remote process */
211                obj.handle = handle;
212                obj.cookie = 0;
213            } else {
214                obj.type = BINDER_TYPE_WEAK_BINDER;
215                obj.binder = reinterpret_cast<uintptr_t>(binder.get_refs());
216                obj.cookie = reinterpret_cast<uintptr_t>(binder.unsafe_get());
217            }
218            return finish_flatten_binder(real, obj, out);
219        }
220
221        // XXX How to deal?  In order to flatten the given binder,
222        // we need to probe it for information, which requires a primary
223        // reference...  but we don't have one.
224        //
225        // The OpenBinder implementation uses a dynamic_cast<> here,
226        // but we can't do that with the different reference counting
227        // implementation we are using.
228        ALOGE("Unable to unflatten Binder weak reference!");
229        obj.type = BINDER_TYPE_BINDER;
230        obj.binder = 0;
231        obj.cookie = 0;
232        return finish_flatten_binder(NULL, obj, out);
233
234    } else {
235        obj.type = BINDER_TYPE_BINDER;
236        obj.binder = 0;
237        obj.cookie = 0;
238        return finish_flatten_binder(NULL, obj, out);
239    }
240}
241
242inline static status_t finish_unflatten_binder(
243    BpBinder* /*proxy*/, const flat_binder_object& /*flat*/,
244    const Parcel& /*in*/)
245{
246    return NO_ERROR;
247}
248
249status_t unflatten_binder(const sp<ProcessState>& proc,
250    const Parcel& in, sp<IBinder>* out)
251{
252    const flat_binder_object* flat = in.readObject(false);
253
254    if (flat) {
255        switch (flat->type) {
256            case BINDER_TYPE_BINDER:
257                *out = reinterpret_cast<IBinder*>(flat->cookie);
258                return finish_unflatten_binder(NULL, *flat, in);
259            case BINDER_TYPE_HANDLE:
260                *out = proc->getStrongProxyForHandle(flat->handle);
261                return finish_unflatten_binder(
262                    static_cast<BpBinder*>(out->get()), *flat, in);
263        }
264    }
265    return BAD_TYPE;
266}
267
268status_t unflatten_binder(const sp<ProcessState>& proc,
269    const Parcel& in, wp<IBinder>* out)
270{
271    const flat_binder_object* flat = in.readObject(false);
272
273    if (flat) {
274        switch (flat->type) {
275            case BINDER_TYPE_BINDER:
276                *out = reinterpret_cast<IBinder*>(flat->cookie);
277                return finish_unflatten_binder(NULL, *flat, in);
278            case BINDER_TYPE_WEAK_BINDER:
279                if (flat->binder != 0) {
280                    out->set_object_and_refs(
281                        reinterpret_cast<IBinder*>(flat->cookie),
282                        reinterpret_cast<RefBase::weakref_type*>(flat->binder));
283                } else {
284                    *out = NULL;
285                }
286                return finish_unflatten_binder(NULL, *flat, in);
287            case BINDER_TYPE_HANDLE:
288            case BINDER_TYPE_WEAK_HANDLE:
289                *out = proc->getWeakProxyForHandle(flat->handle);
290                return finish_unflatten_binder(
291                    static_cast<BpBinder*>(out->unsafe_get()), *flat, in);
292        }
293    }
294    return BAD_TYPE;
295}
296
297// ---------------------------------------------------------------------------
298
299Parcel::Parcel()
300{
301    LOG_ALLOC("Parcel %p: constructing", this);
302    initState();
303}
304
305Parcel::~Parcel()
306{
307    freeDataNoInit();
308    LOG_ALLOC("Parcel %p: destroyed", this);
309}
310
311size_t Parcel::getGlobalAllocSize() {
312    pthread_mutex_lock(&gParcelGlobalAllocSizeLock);
313    size_t size = gParcelGlobalAllocSize;
314    pthread_mutex_unlock(&gParcelGlobalAllocSizeLock);
315    return size;
316}
317
318size_t Parcel::getGlobalAllocCount() {
319    pthread_mutex_lock(&gParcelGlobalAllocSizeLock);
320    size_t count = gParcelGlobalAllocCount;
321    pthread_mutex_unlock(&gParcelGlobalAllocSizeLock);
322    return count;
323}
324
325const uint8_t* Parcel::data() const
326{
327    return mData;
328}
329
330size_t Parcel::dataSize() const
331{
332    return (mDataSize > mDataPos ? mDataSize : mDataPos);
333}
334
335size_t Parcel::dataAvail() const
336{
337    // TODO: decide what to do about the possibility that this can
338    // report an available-data size that exceeds a Java int's max
339    // positive value, causing havoc.  Fortunately this will only
340    // happen if someone constructs a Parcel containing more than two
341    // gigabytes of data, which on typical phone hardware is simply
342    // not possible.
343    return dataSize() - dataPosition();
344}
345
346size_t Parcel::dataPosition() const
347{
348    return mDataPos;
349}
350
351size_t Parcel::dataCapacity() const
352{
353    return mDataCapacity;
354}
355
356status_t Parcel::setDataSize(size_t size)
357{
358    status_t err;
359    err = continueWrite(size);
360    if (err == NO_ERROR) {
361        mDataSize = size;
362        ALOGV("setDataSize Setting data size of %p to %zu", this, mDataSize);
363    }
364    return err;
365}
366
367void Parcel::setDataPosition(size_t pos) const
368{
369    mDataPos = pos;
370    mNextObjectHint = 0;
371}
372
373status_t Parcel::setDataCapacity(size_t size)
374{
375    if (size > mDataCapacity) return continueWrite(size);
376    return NO_ERROR;
377}
378
379status_t Parcel::setData(const uint8_t* buffer, size_t len)
380{
381    status_t err = restartWrite(len);
382    if (err == NO_ERROR) {
383        memcpy(const_cast<uint8_t*>(data()), buffer, len);
384        mDataSize = len;
385        mFdsKnown = false;
386    }
387    return err;
388}
389
390status_t Parcel::appendFrom(const Parcel *parcel, size_t offset, size_t len)
391{
392    const sp<ProcessState> proc(ProcessState::self());
393    status_t err;
394    const uint8_t *data = parcel->mData;
395    const binder_size_t *objects = parcel->mObjects;
396    size_t size = parcel->mObjectsSize;
397    int startPos = mDataPos;
398    int firstIndex = -1, lastIndex = -2;
399
400    if (len == 0) {
401        return NO_ERROR;
402    }
403
404    // range checks against the source parcel size
405    if ((offset > parcel->mDataSize)
406            || (len > parcel->mDataSize)
407            || (offset + len > parcel->mDataSize)) {
408        return BAD_VALUE;
409    }
410
411    // Count objects in range
412    for (int i = 0; i < (int) size; i++) {
413        size_t off = objects[i];
414        if ((off >= offset) && (off + sizeof(flat_binder_object) <= offset + len)) {
415            if (firstIndex == -1) {
416                firstIndex = i;
417            }
418            lastIndex = i;
419        }
420    }
421    int numObjects = lastIndex - firstIndex + 1;
422
423    if ((mDataSize+len) > mDataCapacity) {
424        // grow data
425        err = growData(len);
426        if (err != NO_ERROR) {
427            return err;
428        }
429    }
430
431    // append data
432    memcpy(mData + mDataPos, data + offset, len);
433    mDataPos += len;
434    mDataSize += len;
435
436    err = NO_ERROR;
437
438    if (numObjects > 0) {
439        // grow objects
440        if (mObjectsCapacity < mObjectsSize + numObjects) {
441            int newSize = ((mObjectsSize + numObjects)*3)/2;
442            binder_size_t *objects =
443                (binder_size_t*)realloc(mObjects, newSize*sizeof(binder_size_t));
444            if (objects == (binder_size_t*)0) {
445                return NO_MEMORY;
446            }
447            mObjects = objects;
448            mObjectsCapacity = newSize;
449        }
450
451        // append and acquire objects
452        int idx = mObjectsSize;
453        for (int i = firstIndex; i <= lastIndex; i++) {
454            size_t off = objects[i] - offset + startPos;
455            mObjects[idx++] = off;
456            mObjectsSize++;
457
458            flat_binder_object* flat
459                = reinterpret_cast<flat_binder_object*>(mData + off);
460            acquire_object(proc, *flat, this);
461
462            if (flat->type == BINDER_TYPE_FD) {
463                // If this is a file descriptor, we need to dup it so the
464                // new Parcel now owns its own fd, and can declare that we
465                // officially know we have fds.
466                flat->handle = dup(flat->handle);
467                flat->cookie = 1;
468                mHasFds = mFdsKnown = true;
469                if (!mAllowFds) {
470                    err = FDS_NOT_ALLOWED;
471                }
472            }
473        }
474    }
475
476    return err;
477}
478
479bool Parcel::pushAllowFds(bool allowFds)
480{
481    const bool origValue = mAllowFds;
482    if (!allowFds) {
483        mAllowFds = false;
484    }
485    return origValue;
486}
487
488void Parcel::restoreAllowFds(bool lastValue)
489{
490    mAllowFds = lastValue;
491}
492
493bool Parcel::hasFileDescriptors() const
494{
495    if (!mFdsKnown) {
496        scanForFds();
497    }
498    return mHasFds;
499}
500
501// Write RPC headers.  (previously just the interface token)
502status_t Parcel::writeInterfaceToken(const String16& interface)
503{
504    writeInt32(IPCThreadState::self()->getStrictModePolicy() |
505               STRICT_MODE_PENALTY_GATHER);
506    // currently the interface identification token is just its name as a string
507    return writeString16(interface);
508}
509
510bool Parcel::checkInterface(IBinder* binder) const
511{
512    return enforceInterface(binder->getInterfaceDescriptor());
513}
514
515bool Parcel::enforceInterface(const String16& interface,
516                              IPCThreadState* threadState) const
517{
518    int32_t strictPolicy = readInt32();
519    if (threadState == NULL) {
520        threadState = IPCThreadState::self();
521    }
522    if ((threadState->getLastTransactionBinderFlags() &
523         IBinder::FLAG_ONEWAY) != 0) {
524      // For one-way calls, the callee is running entirely
525      // disconnected from the caller, so disable StrictMode entirely.
526      // Not only does disk/network usage not impact the caller, but
527      // there's no way to commuicate back any violations anyway.
528      threadState->setStrictModePolicy(0);
529    } else {
530      threadState->setStrictModePolicy(strictPolicy);
531    }
532    const String16 str(readString16());
533    if (str == interface) {
534        return true;
535    } else {
536        ALOGW("**** enforceInterface() expected '%s' but read '%s'",
537                String8(interface).string(), String8(str).string());
538        return false;
539    }
540}
541
542const binder_size_t* Parcel::objects() const
543{
544    return mObjects;
545}
546
547size_t Parcel::objectsCount() const
548{
549    return mObjectsSize;
550}
551
552status_t Parcel::errorCheck() const
553{
554    return mError;
555}
556
557void Parcel::setError(status_t err)
558{
559    mError = err;
560}
561
562status_t Parcel::finishWrite(size_t len)
563{
564    //printf("Finish write of %d\n", len);
565    mDataPos += len;
566    ALOGV("finishWrite Setting data pos of %p to %zu", this, mDataPos);
567    if (mDataPos > mDataSize) {
568        mDataSize = mDataPos;
569        ALOGV("finishWrite Setting data size of %p to %zu", this, mDataSize);
570    }
571    //printf("New pos=%d, size=%d\n", mDataPos, mDataSize);
572    return NO_ERROR;
573}
574
575status_t Parcel::writeUnpadded(const void* data, size_t len)
576{
577    size_t end = mDataPos + len;
578    if (end < mDataPos) {
579        // integer overflow
580        return BAD_VALUE;
581    }
582
583    if (end <= mDataCapacity) {
584restart_write:
585        memcpy(mData+mDataPos, data, len);
586        return finishWrite(len);
587    }
588
589    status_t err = growData(len);
590    if (err == NO_ERROR) goto restart_write;
591    return err;
592}
593
594status_t Parcel::write(const void* data, size_t len)
595{
596    void* const d = writeInplace(len);
597    if (d) {
598        memcpy(d, data, len);
599        return NO_ERROR;
600    }
601    return mError;
602}
603
604void* Parcel::writeInplace(size_t len)
605{
606    const size_t padded = PAD_SIZE(len);
607
608    // sanity check for integer overflow
609    if (mDataPos+padded < mDataPos) {
610        return NULL;
611    }
612
613    if ((mDataPos+padded) <= mDataCapacity) {
614restart_write:
615        //printf("Writing %ld bytes, padded to %ld\n", len, padded);
616        uint8_t* const data = mData+mDataPos;
617
618        // Need to pad at end?
619        if (padded != len) {
620#if BYTE_ORDER == BIG_ENDIAN
621            static const uint32_t mask[4] = {
622                0x00000000, 0xffffff00, 0xffff0000, 0xff000000
623            };
624#endif
625#if BYTE_ORDER == LITTLE_ENDIAN
626            static const uint32_t mask[4] = {
627                0x00000000, 0x00ffffff, 0x0000ffff, 0x000000ff
628            };
629#endif
630            //printf("Applying pad mask: %p to %p\n", (void*)mask[padded-len],
631            //    *reinterpret_cast<void**>(data+padded-4));
632            *reinterpret_cast<uint32_t*>(data+padded-4) &= mask[padded-len];
633        }
634
635        finishWrite(padded);
636        return data;
637    }
638
639    status_t err = growData(padded);
640    if (err == NO_ERROR) goto restart_write;
641    return NULL;
642}
643
644status_t Parcel::writeInt32(int32_t val)
645{
646    return writeAligned(val);
647}
648status_t Parcel::writeInt32Array(size_t len, const int32_t *val) {
649    if (!val) {
650        return writeAligned(-1);
651    }
652    status_t ret = writeAligned(len);
653    if (ret == NO_ERROR) {
654        ret = write(val, len * sizeof(*val));
655    }
656    return ret;
657}
658status_t Parcel::writeByteArray(size_t len, const uint8_t *val) {
659    if (!val) {
660        return writeAligned(-1);
661    }
662    status_t ret = writeAligned(len);
663    if (ret == NO_ERROR) {
664        ret = write(val, len * sizeof(*val));
665    }
666    return ret;
667}
668
669status_t Parcel::writeInt64(int64_t val)
670{
671    return writeAligned(val);
672}
673
674status_t Parcel::writePointer(uintptr_t val)
675{
676    return writeAligned<binder_uintptr_t>(val);
677}
678
679status_t Parcel::writeFloat(float val)
680{
681    return writeAligned(val);
682}
683
684#if defined(__mips__) && defined(__mips_hard_float)
685
686status_t Parcel::writeDouble(double val)
687{
688    union {
689        double d;
690        unsigned long long ll;
691    } u;
692    u.d = val;
693    return writeAligned(u.ll);
694}
695
696#else
697
698status_t Parcel::writeDouble(double val)
699{
700    return writeAligned(val);
701}
702
703#endif
704
705status_t Parcel::writeCString(const char* str)
706{
707    return write(str, strlen(str)+1);
708}
709
710status_t Parcel::writeString8(const String8& str)
711{
712    status_t err = writeInt32(str.bytes());
713    // only write string if its length is more than zero characters,
714    // as readString8 will only read if the length field is non-zero.
715    // this is slightly different from how writeString16 works.
716    if (str.bytes() > 0 && err == NO_ERROR) {
717        err = write(str.string(), str.bytes()+1);
718    }
719    return err;
720}
721
722status_t Parcel::writeString16(const String16& str)
723{
724    return writeString16(str.string(), str.size());
725}
726
727status_t Parcel::writeString16(const char16_t* str, size_t len)
728{
729    if (str == NULL) return writeInt32(-1);
730
731    status_t err = writeInt32(len);
732    if (err == NO_ERROR) {
733        len *= sizeof(char16_t);
734        uint8_t* data = (uint8_t*)writeInplace(len+sizeof(char16_t));
735        if (data) {
736            memcpy(data, str, len);
737            *reinterpret_cast<char16_t*>(data+len) = 0;
738            return NO_ERROR;
739        }
740        err = mError;
741    }
742    return err;
743}
744
745status_t Parcel::writeStrongBinder(const sp<IBinder>& val)
746{
747    return flatten_binder(ProcessState::self(), val, this);
748}
749
750status_t Parcel::writeWeakBinder(const wp<IBinder>& val)
751{
752    return flatten_binder(ProcessState::self(), val, this);
753}
754
755status_t Parcel::writeNativeHandle(const native_handle* handle)
756{
757    if (!handle || handle->version != sizeof(native_handle))
758        return BAD_TYPE;
759
760    status_t err;
761    err = writeInt32(handle->numFds);
762    if (err != NO_ERROR) return err;
763
764    err = writeInt32(handle->numInts);
765    if (err != NO_ERROR) return err;
766
767    for (int i=0 ; err==NO_ERROR && i<handle->numFds ; i++)
768        err = writeDupFileDescriptor(handle->data[i]);
769
770    if (err != NO_ERROR) {
771        ALOGD("write native handle, write dup fd failed");
772        return err;
773    }
774    err = write(handle->data + handle->numFds, sizeof(int)*handle->numInts);
775    return err;
776}
777
778status_t Parcel::writeFileDescriptor(int fd, bool takeOwnership)
779{
780    flat_binder_object obj;
781    obj.type = BINDER_TYPE_FD;
782    obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS;
783    obj.binder = 0; /* Don't pass uninitialized stack data to a remote process */
784    obj.handle = fd;
785    obj.cookie = takeOwnership ? 1 : 0;
786    return writeObject(obj, true);
787}
788
789status_t Parcel::writeDupFileDescriptor(int fd)
790{
791    int dupFd = dup(fd);
792    if (dupFd < 0) {
793        return -errno;
794    }
795    status_t err = writeFileDescriptor(dupFd, true /*takeOwnership*/);
796    if (err) {
797        close(dupFd);
798    }
799    return err;
800}
801
802// WARNING: This method must stay in sync with
803// Parcelable.Creator<ParcelFileDescriptor> CREATOR
804// in frameworks/base/core/java/android/os/ParcelFileDescriptor.java
805status_t Parcel::writeParcelFileDescriptor(int fd, int commChannel) {
806    status_t status;
807
808    if (fd < 0) {
809        status = writeInt32(0); // ParcelFileDescriptor is null
810        if (status) return status;
811    } else {
812        status = writeInt32(1); // ParcelFileDescriptor is not null
813        if (status) return status;
814        status = writeDupFileDescriptor(fd);
815        if (status) return status;
816        if (commChannel < 0) {
817            status = writeInt32(0); // commChannel is null
818            if (status) return status;
819        } else {
820            status = writeInt32(1); // commChannel is not null
821            if (status) return status;
822            status = writeDupFileDescriptor(commChannel);
823        }
824    }
825    return status;
826}
827
828status_t Parcel::writeBlob(size_t len, WritableBlob* outBlob)
829{
830    status_t status;
831
832    if (!mAllowFds || len <= IN_PLACE_BLOB_LIMIT) {
833        ALOGV("writeBlob: write in place");
834        status = writeInt32(0);
835        if (status) return status;
836
837        void* ptr = writeInplace(len);
838        if (!ptr) return NO_MEMORY;
839
840        outBlob->init(false /*mapped*/, ptr, len);
841        return NO_ERROR;
842    }
843
844    ALOGV("writeBlob: write to ashmem");
845    int fd = ashmem_create_region("Parcel Blob", len);
846    if (fd < 0) return NO_MEMORY;
847
848    int result = ashmem_set_prot_region(fd, PROT_READ | PROT_WRITE);
849    if (result < 0) {
850        status = result;
851    } else {
852        void* ptr = ::mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
853        if (ptr == MAP_FAILED) {
854            status = -errno;
855        } else {
856            result = ashmem_set_prot_region(fd, PROT_READ);
857            if (result < 0) {
858                status = result;
859            } else {
860                status = writeInt32(1);
861                if (!status) {
862                    status = writeFileDescriptor(fd, true /*takeOwnership*/);
863                    if (!status) {
864                        outBlob->init(true /*mapped*/, ptr, len);
865                        return NO_ERROR;
866                    }
867                }
868            }
869        }
870        ::munmap(ptr, len);
871    }
872    ::close(fd);
873    return status;
874}
875
876status_t Parcel::write(const FlattenableHelperInterface& val)
877{
878    status_t err;
879
880    // size if needed
881    const size_t len = val.getFlattenedSize();
882    const size_t fd_count = val.getFdCount();
883
884    err = this->writeInt32(len);
885    if (err) return err;
886
887    err = this->writeInt32(fd_count);
888    if (err) return err;
889
890    // payload
891    void* const buf = this->writeInplace(PAD_SIZE(len));
892    if (buf == NULL)
893        return BAD_VALUE;
894
895    int* fds = NULL;
896    if (fd_count) {
897        fds = new int[fd_count];
898    }
899
900    err = val.flatten(buf, len, fds, fd_count);
901    for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) {
902        err = this->writeDupFileDescriptor( fds[i] );
903    }
904
905    if (fd_count) {
906        delete [] fds;
907    }
908
909    return err;
910}
911
912status_t Parcel::writeObject(const flat_binder_object& val, bool nullMetaData)
913{
914    const bool enoughData = (mDataPos+sizeof(val)) <= mDataCapacity;
915    const bool enoughObjects = mObjectsSize < mObjectsCapacity;
916    if (enoughData && enoughObjects) {
917restart_write:
918        *reinterpret_cast<flat_binder_object*>(mData+mDataPos) = val;
919
920        // Need to write meta-data?
921        if (nullMetaData || val.binder != 0) {
922            mObjects[mObjectsSize] = mDataPos;
923            acquire_object(ProcessState::self(), val, this);
924            mObjectsSize++;
925        }
926
927        // remember if it's a file descriptor
928        if (val.type == BINDER_TYPE_FD) {
929            if (!mAllowFds) {
930                return FDS_NOT_ALLOWED;
931            }
932            mHasFds = mFdsKnown = true;
933        }
934
935        return finishWrite(sizeof(flat_binder_object));
936    }
937
938    if (!enoughData) {
939        const status_t err = growData(sizeof(val));
940        if (err != NO_ERROR) return err;
941    }
942    if (!enoughObjects) {
943        size_t newSize = ((mObjectsSize+2)*3)/2;
944        binder_size_t* objects = (binder_size_t*)realloc(mObjects, newSize*sizeof(binder_size_t));
945        if (objects == NULL) return NO_MEMORY;
946        mObjects = objects;
947        mObjectsCapacity = newSize;
948    }
949
950    goto restart_write;
951}
952
953status_t Parcel::writeNoException()
954{
955    return writeInt32(0);
956}
957
958void Parcel::remove(size_t /*start*/, size_t /*amt*/)
959{
960    LOG_ALWAYS_FATAL("Parcel::remove() not yet implemented!");
961}
962
963status_t Parcel::read(void* outData, size_t len) const
964{
965    if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize
966            && len <= PAD_SIZE(len)) {
967        memcpy(outData, mData+mDataPos, len);
968        mDataPos += PAD_SIZE(len);
969        ALOGV("read Setting data pos of %p to %zu", this, mDataPos);
970        return NO_ERROR;
971    }
972    return NOT_ENOUGH_DATA;
973}
974
975const void* Parcel::readInplace(size_t len) const
976{
977    if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize
978            && len <= PAD_SIZE(len)) {
979        const void* data = mData+mDataPos;
980        mDataPos += PAD_SIZE(len);
981        ALOGV("readInplace Setting data pos of %p to %zu", this, mDataPos);
982        return data;
983    }
984    return NULL;
985}
986
987template<class T>
988status_t Parcel::readAligned(T *pArg) const {
989    COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE(sizeof(T)) == sizeof(T));
990
991    if ((mDataPos+sizeof(T)) <= mDataSize) {
992        const void* data = mData+mDataPos;
993        mDataPos += sizeof(T);
994        *pArg =  *reinterpret_cast<const T*>(data);
995        return NO_ERROR;
996    } else {
997        return NOT_ENOUGH_DATA;
998    }
999}
1000
1001template<class T>
1002T Parcel::readAligned() const {
1003    T result;
1004    if (readAligned(&result) != NO_ERROR) {
1005        result = 0;
1006    }
1007
1008    return result;
1009}
1010
1011template<class T>
1012status_t Parcel::writeAligned(T val) {
1013    COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE(sizeof(T)) == sizeof(T));
1014
1015    if ((mDataPos+sizeof(val)) <= mDataCapacity) {
1016restart_write:
1017        *reinterpret_cast<T*>(mData+mDataPos) = val;
1018        return finishWrite(sizeof(val));
1019    }
1020
1021    status_t err = growData(sizeof(val));
1022    if (err == NO_ERROR) goto restart_write;
1023    return err;
1024}
1025
1026status_t Parcel::readInt32(int32_t *pArg) const
1027{
1028    return readAligned(pArg);
1029}
1030
1031int32_t Parcel::readInt32() const
1032{
1033    return readAligned<int32_t>();
1034}
1035
1036
1037status_t Parcel::readInt64(int64_t *pArg) const
1038{
1039    return readAligned(pArg);
1040}
1041
1042
1043int64_t Parcel::readInt64() const
1044{
1045    return readAligned<int64_t>();
1046}
1047
1048status_t Parcel::readPointer(uintptr_t *pArg) const
1049{
1050    status_t ret;
1051    binder_uintptr_t ptr;
1052    ret = readAligned(&ptr);
1053    if (!ret)
1054        *pArg = ptr;
1055    return ret;
1056}
1057
1058uintptr_t Parcel::readPointer() const
1059{
1060    return readAligned<binder_uintptr_t>();
1061}
1062
1063
1064status_t Parcel::readFloat(float *pArg) const
1065{
1066    return readAligned(pArg);
1067}
1068
1069
1070float Parcel::readFloat() const
1071{
1072    return readAligned<float>();
1073}
1074
1075#if defined(__mips__) && defined(__mips_hard_float)
1076
1077status_t Parcel::readDouble(double *pArg) const
1078{
1079    union {
1080      double d;
1081      unsigned long long ll;
1082    } u;
1083    u.d = 0;
1084    status_t status;
1085    status = readAligned(&u.ll);
1086    *pArg = u.d;
1087    return status;
1088}
1089
1090double Parcel::readDouble() const
1091{
1092    union {
1093      double d;
1094      unsigned long long ll;
1095    } u;
1096    u.ll = readAligned<unsigned long long>();
1097    return u.d;
1098}
1099
1100#else
1101
1102status_t Parcel::readDouble(double *pArg) const
1103{
1104    return readAligned(pArg);
1105}
1106
1107double Parcel::readDouble() const
1108{
1109    return readAligned<double>();
1110}
1111
1112#endif
1113
1114status_t Parcel::readIntPtr(intptr_t *pArg) const
1115{
1116    return readAligned(pArg);
1117}
1118
1119
1120intptr_t Parcel::readIntPtr() const
1121{
1122    return readAligned<intptr_t>();
1123}
1124
1125
1126const char* Parcel::readCString() const
1127{
1128    const size_t avail = mDataSize-mDataPos;
1129    if (avail > 0) {
1130        const char* str = reinterpret_cast<const char*>(mData+mDataPos);
1131        // is the string's trailing NUL within the parcel's valid bounds?
1132        const char* eos = reinterpret_cast<const char*>(memchr(str, 0, avail));
1133        if (eos) {
1134            const size_t len = eos - str;
1135            mDataPos += PAD_SIZE(len+1);
1136            ALOGV("readCString Setting data pos of %p to %zu", this, mDataPos);
1137            return str;
1138        }
1139    }
1140    return NULL;
1141}
1142
1143String8 Parcel::readString8() const
1144{
1145    int32_t size = readInt32();
1146    // watch for potential int overflow adding 1 for trailing NUL
1147    if (size > 0 && size < INT32_MAX) {
1148        const char* str = (const char*)readInplace(size+1);
1149        if (str) return String8(str, size);
1150    }
1151    return String8();
1152}
1153
1154String16 Parcel::readString16() const
1155{
1156    size_t len;
1157    const char16_t* str = readString16Inplace(&len);
1158    if (str) return String16(str, len);
1159    ALOGE("Reading a NULL string not supported here.");
1160    return String16();
1161}
1162
1163const char16_t* Parcel::readString16Inplace(size_t* outLen) const
1164{
1165    int32_t size = readInt32();
1166    // watch for potential int overflow from size+1
1167    if (size >= 0 && size < INT32_MAX) {
1168        *outLen = size;
1169        const char16_t* str = (const char16_t*)readInplace((size+1)*sizeof(char16_t));
1170        if (str != NULL) {
1171            return str;
1172        }
1173    }
1174    *outLen = 0;
1175    return NULL;
1176}
1177
1178sp<IBinder> Parcel::readStrongBinder() const
1179{
1180    sp<IBinder> val;
1181    unflatten_binder(ProcessState::self(), *this, &val);
1182    return val;
1183}
1184
1185wp<IBinder> Parcel::readWeakBinder() const
1186{
1187    wp<IBinder> val;
1188    unflatten_binder(ProcessState::self(), *this, &val);
1189    return val;
1190}
1191
1192int32_t Parcel::readExceptionCode() const
1193{
1194  int32_t exception_code = readAligned<int32_t>();
1195  if (exception_code == EX_HAS_REPLY_HEADER) {
1196    int32_t header_start = dataPosition();
1197    int32_t header_size = readAligned<int32_t>();
1198    // Skip over fat responses headers.  Not used (or propagated) in
1199    // native code
1200    setDataPosition(header_start + header_size);
1201    // And fat response headers are currently only used when there are no
1202    // exceptions, so return no error:
1203    return 0;
1204  }
1205  return exception_code;
1206}
1207
1208native_handle* Parcel::readNativeHandle() const
1209{
1210    int numFds, numInts;
1211    status_t err;
1212    err = readInt32(&numFds);
1213    if (err != NO_ERROR) return 0;
1214    err = readInt32(&numInts);
1215    if (err != NO_ERROR) return 0;
1216
1217    native_handle* h = native_handle_create(numFds, numInts);
1218    if (!h) {
1219        return 0;
1220    }
1221
1222    for (int i=0 ; err==NO_ERROR && i<numFds ; i++) {
1223        h->data[i] = dup(readFileDescriptor());
1224        if (h->data[i] < 0) err = BAD_VALUE;
1225    }
1226    err = read(h->data + numFds, sizeof(int)*numInts);
1227    if (err != NO_ERROR) {
1228        native_handle_close(h);
1229        native_handle_delete(h);
1230        h = 0;
1231    }
1232    return h;
1233}
1234
1235
1236int Parcel::readFileDescriptor() const
1237{
1238    const flat_binder_object* flat = readObject(true);
1239    if (flat) {
1240        switch (flat->type) {
1241            case BINDER_TYPE_FD:
1242                //ALOGI("Returning file descriptor %ld from parcel %p", flat->handle, this);
1243                return flat->handle;
1244        }
1245    }
1246    return BAD_TYPE;
1247}
1248
1249// WARNING: This method must stay in sync with writeToParcel()
1250// in frameworks/base/core/java/android/os/ParcelFileDescriptor.java
1251int Parcel::readParcelFileDescriptor(int& outCommChannel) const {
1252    int fd;
1253    outCommChannel = -1;
1254
1255    if (readInt32() == 0) {
1256        fd = -1;
1257    } else {
1258        fd = readFileDescriptor();
1259        if (fd >= 0 && readInt32() != 0) {
1260            outCommChannel = readFileDescriptor();
1261        }
1262    }
1263    return fd;
1264}
1265
1266status_t Parcel::readBlob(size_t len, ReadableBlob* outBlob) const
1267{
1268    int32_t useAshmem;
1269    status_t status = readInt32(&useAshmem);
1270    if (status) return status;
1271
1272    if (!useAshmem) {
1273        ALOGV("readBlob: read in place");
1274        const void* ptr = readInplace(len);
1275        if (!ptr) return BAD_VALUE;
1276
1277        outBlob->init(false /*mapped*/, const_cast<void*>(ptr), len);
1278        return NO_ERROR;
1279    }
1280
1281    ALOGV("readBlob: read from ashmem");
1282    int fd = readFileDescriptor();
1283    if (fd == int(BAD_TYPE)) return BAD_VALUE;
1284
1285    void* ptr = ::mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0);
1286    if (ptr == MAP_FAILED) return NO_MEMORY;
1287
1288    outBlob->init(true /*mapped*/, ptr, len);
1289    return NO_ERROR;
1290}
1291
1292status_t Parcel::read(FlattenableHelperInterface& val) const
1293{
1294    // size
1295    const size_t len = this->readInt32();
1296    const size_t fd_count = this->readInt32();
1297
1298    // payload
1299    void const* const buf = this->readInplace(PAD_SIZE(len));
1300    if (buf == NULL)
1301        return BAD_VALUE;
1302
1303    int* fds = NULL;
1304    if (fd_count) {
1305        fds = new int[fd_count];
1306    }
1307
1308    status_t err = NO_ERROR;
1309    for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) {
1310        fds[i] = dup(this->readFileDescriptor());
1311        if (fds[i] < 0) {
1312            err = BAD_VALUE;
1313            ALOGE("dup() failed in Parcel::read, i is %zu, fds[i] is %d, fd_count is %zu, error: %s",
1314                i, fds[i], fd_count, strerror(errno));
1315        }
1316    }
1317
1318    if (err == NO_ERROR) {
1319        err = val.unflatten(buf, len, fds, fd_count);
1320    }
1321
1322    if (fd_count) {
1323        delete [] fds;
1324    }
1325
1326    return err;
1327}
1328const flat_binder_object* Parcel::readObject(bool nullMetaData) const
1329{
1330    const size_t DPOS = mDataPos;
1331    if ((DPOS+sizeof(flat_binder_object)) <= mDataSize) {
1332        const flat_binder_object* obj
1333                = reinterpret_cast<const flat_binder_object*>(mData+DPOS);
1334        mDataPos = DPOS + sizeof(flat_binder_object);
1335        if (!nullMetaData && (obj->cookie == 0 && obj->binder == 0)) {
1336            // When transferring a NULL object, we don't write it into
1337            // the object list, so we don't want to check for it when
1338            // reading.
1339            ALOGV("readObject Setting data pos of %p to %zu", this, mDataPos);
1340            return obj;
1341        }
1342
1343        // Ensure that this object is valid...
1344        binder_size_t* const OBJS = mObjects;
1345        const size_t N = mObjectsSize;
1346        size_t opos = mNextObjectHint;
1347
1348        if (N > 0) {
1349            ALOGV("Parcel %p looking for obj at %zu, hint=%zu",
1350                 this, DPOS, opos);
1351
1352            // Start at the current hint position, looking for an object at
1353            // the current data position.
1354            if (opos < N) {
1355                while (opos < (N-1) && OBJS[opos] < DPOS) {
1356                    opos++;
1357                }
1358            } else {
1359                opos = N-1;
1360            }
1361            if (OBJS[opos] == DPOS) {
1362                // Found it!
1363                ALOGV("Parcel %p found obj %zu at index %zu with forward search",
1364                     this, DPOS, opos);
1365                mNextObjectHint = opos+1;
1366                ALOGV("readObject Setting data pos of %p to %zu", this, mDataPos);
1367                return obj;
1368            }
1369
1370            // Look backwards for it...
1371            while (opos > 0 && OBJS[opos] > DPOS) {
1372                opos--;
1373            }
1374            if (OBJS[opos] == DPOS) {
1375                // Found it!
1376                ALOGV("Parcel %p found obj %zu at index %zu with backward search",
1377                     this, DPOS, opos);
1378                mNextObjectHint = opos+1;
1379                ALOGV("readObject Setting data pos of %p to %zu", this, mDataPos);
1380                return obj;
1381            }
1382        }
1383        ALOGW("Attempt to read object from Parcel %p at offset %zu that is not in the object list",
1384             this, DPOS);
1385    }
1386    return NULL;
1387}
1388
1389void Parcel::closeFileDescriptors()
1390{
1391    size_t i = mObjectsSize;
1392    if (i > 0) {
1393        //ALOGI("Closing file descriptors for %zu objects...", i);
1394    }
1395    while (i > 0) {
1396        i--;
1397        const flat_binder_object* flat
1398            = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]);
1399        if (flat->type == BINDER_TYPE_FD) {
1400            //ALOGI("Closing fd: %ld", flat->handle);
1401            close(flat->handle);
1402        }
1403    }
1404}
1405
1406uintptr_t Parcel::ipcData() const
1407{
1408    return reinterpret_cast<uintptr_t>(mData);
1409}
1410
1411size_t Parcel::ipcDataSize() const
1412{
1413    return (mDataSize > mDataPos ? mDataSize : mDataPos);
1414}
1415
1416uintptr_t Parcel::ipcObjects() const
1417{
1418    return reinterpret_cast<uintptr_t>(mObjects);
1419}
1420
1421size_t Parcel::ipcObjectsCount() const
1422{
1423    return mObjectsSize;
1424}
1425
1426void Parcel::ipcSetDataReference(const uint8_t* data, size_t dataSize,
1427    const binder_size_t* objects, size_t objectsCount, release_func relFunc, void* relCookie)
1428{
1429    binder_size_t minOffset = 0;
1430    freeDataNoInit();
1431    mError = NO_ERROR;
1432    mData = const_cast<uint8_t*>(data);
1433    mDataSize = mDataCapacity = dataSize;
1434    //ALOGI("setDataReference Setting data size of %p to %lu (pid=%d)", this, mDataSize, getpid());
1435    mDataPos = 0;
1436    ALOGV("setDataReference Setting data pos of %p to %zu", this, mDataPos);
1437    mObjects = const_cast<binder_size_t*>(objects);
1438    mObjectsSize = mObjectsCapacity = objectsCount;
1439    mNextObjectHint = 0;
1440    mOwner = relFunc;
1441    mOwnerCookie = relCookie;
1442    for (size_t i = 0; i < mObjectsSize; i++) {
1443        binder_size_t offset = mObjects[i];
1444        if (offset < minOffset) {
1445            ALOGE("%s: bad object offset %"PRIu64" < %"PRIu64"\n",
1446                  __func__, (uint64_t)offset, (uint64_t)minOffset);
1447            mObjectsSize = 0;
1448            break;
1449        }
1450        minOffset = offset + sizeof(flat_binder_object);
1451    }
1452    scanForFds();
1453}
1454
1455void Parcel::print(TextOutput& to, uint32_t /*flags*/) const
1456{
1457    to << "Parcel(";
1458
1459    if (errorCheck() != NO_ERROR) {
1460        const status_t err = errorCheck();
1461        to << "Error: " << (void*)(intptr_t)err << " \"" << strerror(-err) << "\"";
1462    } else if (dataSize() > 0) {
1463        const uint8_t* DATA = data();
1464        to << indent << HexDump(DATA, dataSize()) << dedent;
1465        const binder_size_t* OBJS = objects();
1466        const size_t N = objectsCount();
1467        for (size_t i=0; i<N; i++) {
1468            const flat_binder_object* flat
1469                = reinterpret_cast<const flat_binder_object*>(DATA+OBJS[i]);
1470            to << endl << "Object #" << i << " @ " << (void*)OBJS[i] << ": "
1471                << TypeCode(flat->type & 0x7f7f7f00)
1472                << " = " << flat->binder;
1473        }
1474    } else {
1475        to << "NULL";
1476    }
1477
1478    to << ")";
1479}
1480
1481void Parcel::releaseObjects()
1482{
1483    const sp<ProcessState> proc(ProcessState::self());
1484    size_t i = mObjectsSize;
1485    uint8_t* const data = mData;
1486    binder_size_t* const objects = mObjects;
1487    while (i > 0) {
1488        i--;
1489        const flat_binder_object* flat
1490            = reinterpret_cast<flat_binder_object*>(data+objects[i]);
1491        release_object(proc, *flat, this);
1492    }
1493}
1494
1495void Parcel::acquireObjects()
1496{
1497    const sp<ProcessState> proc(ProcessState::self());
1498    size_t i = mObjectsSize;
1499    uint8_t* const data = mData;
1500    binder_size_t* const objects = mObjects;
1501    while (i > 0) {
1502        i--;
1503        const flat_binder_object* flat
1504            = reinterpret_cast<flat_binder_object*>(data+objects[i]);
1505        acquire_object(proc, *flat, this);
1506    }
1507}
1508
1509void Parcel::freeData()
1510{
1511    freeDataNoInit();
1512    initState();
1513}
1514
1515void Parcel::freeDataNoInit()
1516{
1517    if (mOwner) {
1518        LOG_ALLOC("Parcel %p: freeing other owner data", this);
1519        //ALOGI("Freeing data ref of %p (pid=%d)", this, getpid());
1520        mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie);
1521    } else {
1522        LOG_ALLOC("Parcel %p: freeing allocated data", this);
1523        releaseObjects();
1524        if (mData) {
1525            LOG_ALLOC("Parcel %p: freeing with %zu capacity", this, mDataCapacity);
1526            pthread_mutex_lock(&gParcelGlobalAllocSizeLock);
1527            gParcelGlobalAllocSize -= mDataCapacity;
1528            gParcelGlobalAllocCount--;
1529            pthread_mutex_unlock(&gParcelGlobalAllocSizeLock);
1530            free(mData);
1531        }
1532        if (mObjects) free(mObjects);
1533    }
1534}
1535
1536status_t Parcel::growData(size_t len)
1537{
1538    size_t newSize = ((mDataSize+len)*3)/2;
1539    return (newSize <= mDataSize)
1540            ? (status_t) NO_MEMORY
1541            : continueWrite(newSize);
1542}
1543
1544status_t Parcel::restartWrite(size_t desired)
1545{
1546    if (mOwner) {
1547        freeData();
1548        return continueWrite(desired);
1549    }
1550
1551    uint8_t* data = (uint8_t*)realloc(mData, desired);
1552    if (!data && desired > mDataCapacity) {
1553        mError = NO_MEMORY;
1554        return NO_MEMORY;
1555    }
1556
1557    releaseObjects();
1558
1559    if (data) {
1560        LOG_ALLOC("Parcel %p: restart from %zu to %zu capacity", this, mDataCapacity, desired);
1561        pthread_mutex_lock(&gParcelGlobalAllocSizeLock);
1562        gParcelGlobalAllocSize += desired;
1563        gParcelGlobalAllocSize -= mDataCapacity;
1564        pthread_mutex_unlock(&gParcelGlobalAllocSizeLock);
1565        mData = data;
1566        mDataCapacity = desired;
1567    }
1568
1569    mDataSize = mDataPos = 0;
1570    ALOGV("restartWrite Setting data size of %p to %zu", this, mDataSize);
1571    ALOGV("restartWrite Setting data pos of %p to %zu", this, mDataPos);
1572
1573    free(mObjects);
1574    mObjects = NULL;
1575    mObjectsSize = mObjectsCapacity = 0;
1576    mNextObjectHint = 0;
1577    mHasFds = false;
1578    mFdsKnown = true;
1579    mAllowFds = true;
1580
1581    return NO_ERROR;
1582}
1583
1584status_t Parcel::continueWrite(size_t desired)
1585{
1586    // If shrinking, first adjust for any objects that appear
1587    // after the new data size.
1588    size_t objectsSize = mObjectsSize;
1589    if (desired < mDataSize) {
1590        if (desired == 0) {
1591            objectsSize = 0;
1592        } else {
1593            while (objectsSize > 0) {
1594                if (mObjects[objectsSize-1] < desired)
1595                    break;
1596                objectsSize--;
1597            }
1598        }
1599    }
1600
1601    if (mOwner) {
1602        // If the size is going to zero, just release the owner's data.
1603        if (desired == 0) {
1604            freeData();
1605            return NO_ERROR;
1606        }
1607
1608        // If there is a different owner, we need to take
1609        // posession.
1610        uint8_t* data = (uint8_t*)malloc(desired);
1611        if (!data) {
1612            mError = NO_MEMORY;
1613            return NO_MEMORY;
1614        }
1615        binder_size_t* objects = NULL;
1616
1617        if (objectsSize) {
1618            objects = (binder_size_t*)malloc(objectsSize*sizeof(binder_size_t));
1619            if (!objects) {
1620                free(data);
1621
1622                mError = NO_MEMORY;
1623                return NO_MEMORY;
1624            }
1625
1626            // Little hack to only acquire references on objects
1627            // we will be keeping.
1628            size_t oldObjectsSize = mObjectsSize;
1629            mObjectsSize = objectsSize;
1630            acquireObjects();
1631            mObjectsSize = oldObjectsSize;
1632        }
1633
1634        if (mData) {
1635            memcpy(data, mData, mDataSize < desired ? mDataSize : desired);
1636        }
1637        if (objects && mObjects) {
1638            memcpy(objects, mObjects, objectsSize*sizeof(binder_size_t));
1639        }
1640        //ALOGI("Freeing data ref of %p (pid=%d)", this, getpid());
1641        mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie);
1642        mOwner = NULL;
1643
1644        LOG_ALLOC("Parcel %p: taking ownership of %zu capacity", this, desired);
1645        pthread_mutex_lock(&gParcelGlobalAllocSizeLock);
1646        gParcelGlobalAllocSize += desired;
1647        gParcelGlobalAllocCount++;
1648        pthread_mutex_unlock(&gParcelGlobalAllocSizeLock);
1649
1650        mData = data;
1651        mObjects = objects;
1652        mDataSize = (mDataSize < desired) ? mDataSize : desired;
1653        ALOGV("continueWrite Setting data size of %p to %zu", this, mDataSize);
1654        mDataCapacity = desired;
1655        mObjectsSize = mObjectsCapacity = objectsSize;
1656        mNextObjectHint = 0;
1657
1658    } else if (mData) {
1659        if (objectsSize < mObjectsSize) {
1660            // Need to release refs on any objects we are dropping.
1661            const sp<ProcessState> proc(ProcessState::self());
1662            for (size_t i=objectsSize; i<mObjectsSize; i++) {
1663                const flat_binder_object* flat
1664                    = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]);
1665                if (flat->type == BINDER_TYPE_FD) {
1666                    // will need to rescan because we may have lopped off the only FDs
1667                    mFdsKnown = false;
1668                }
1669                release_object(proc, *flat, this);
1670            }
1671            binder_size_t* objects =
1672                (binder_size_t*)realloc(mObjects, objectsSize*sizeof(binder_size_t));
1673            if (objects) {
1674                mObjects = objects;
1675            }
1676            mObjectsSize = objectsSize;
1677            mNextObjectHint = 0;
1678        }
1679
1680        // We own the data, so we can just do a realloc().
1681        if (desired > mDataCapacity) {
1682            uint8_t* data = (uint8_t*)realloc(mData, desired);
1683            if (data) {
1684                LOG_ALLOC("Parcel %p: continue from %zu to %zu capacity", this, mDataCapacity,
1685                        desired);
1686                pthread_mutex_lock(&gParcelGlobalAllocSizeLock);
1687                gParcelGlobalAllocSize += desired;
1688                gParcelGlobalAllocSize -= mDataCapacity;
1689                pthread_mutex_unlock(&gParcelGlobalAllocSizeLock);
1690                mData = data;
1691                mDataCapacity = desired;
1692            } else if (desired > mDataCapacity) {
1693                mError = NO_MEMORY;
1694                return NO_MEMORY;
1695            }
1696        } else {
1697            if (mDataSize > desired) {
1698                mDataSize = desired;
1699                ALOGV("continueWrite Setting data size of %p to %zu", this, mDataSize);
1700            }
1701            if (mDataPos > desired) {
1702                mDataPos = desired;
1703                ALOGV("continueWrite Setting data pos of %p to %zu", this, mDataPos);
1704            }
1705        }
1706
1707    } else {
1708        // This is the first data.  Easy!
1709        uint8_t* data = (uint8_t*)malloc(desired);
1710        if (!data) {
1711            mError = NO_MEMORY;
1712            return NO_MEMORY;
1713        }
1714
1715        if(!(mDataCapacity == 0 && mObjects == NULL
1716             && mObjectsCapacity == 0)) {
1717            ALOGE("continueWrite: %zu/%p/%zu/%zu", mDataCapacity, mObjects, mObjectsCapacity, desired);
1718        }
1719
1720        LOG_ALLOC("Parcel %p: allocating with %zu capacity", this, desired);
1721        pthread_mutex_lock(&gParcelGlobalAllocSizeLock);
1722        gParcelGlobalAllocSize += desired;
1723        gParcelGlobalAllocCount++;
1724        pthread_mutex_unlock(&gParcelGlobalAllocSizeLock);
1725
1726        mData = data;
1727        mDataSize = mDataPos = 0;
1728        ALOGV("continueWrite Setting data size of %p to %zu", this, mDataSize);
1729        ALOGV("continueWrite Setting data pos of %p to %zu", this, mDataPos);
1730        mDataCapacity = desired;
1731    }
1732
1733    return NO_ERROR;
1734}
1735
1736void Parcel::initState()
1737{
1738    LOG_ALLOC("Parcel %p: initState", this);
1739    mError = NO_ERROR;
1740    mData = 0;
1741    mDataSize = 0;
1742    mDataCapacity = 0;
1743    mDataPos = 0;
1744    ALOGV("initState Setting data size of %p to %zu", this, mDataSize);
1745    ALOGV("initState Setting data pos of %p to %zu", this, mDataPos);
1746    mObjects = NULL;
1747    mObjectsSize = 0;
1748    mObjectsCapacity = 0;
1749    mNextObjectHint = 0;
1750    mHasFds = false;
1751    mFdsKnown = true;
1752    mAllowFds = true;
1753    mOwner = NULL;
1754}
1755
1756void Parcel::scanForFds() const
1757{
1758    bool hasFds = false;
1759    for (size_t i=0; i<mObjectsSize; i++) {
1760        const flat_binder_object* flat
1761            = reinterpret_cast<const flat_binder_object*>(mData + mObjects[i]);
1762        if (flat->type == BINDER_TYPE_FD) {
1763            hasFds = true;
1764            break;
1765        }
1766    }
1767    mHasFds = hasFds;
1768    mFdsKnown = true;
1769}
1770
1771// --- Parcel::Blob ---
1772
1773Parcel::Blob::Blob() :
1774        mMapped(false), mData(NULL), mSize(0) {
1775}
1776
1777Parcel::Blob::~Blob() {
1778    release();
1779}
1780
1781void Parcel::Blob::release() {
1782    if (mMapped && mData) {
1783        ::munmap(mData, mSize);
1784    }
1785    clear();
1786}
1787
1788void Parcel::Blob::init(bool mapped, void* data, size_t size) {
1789    mMapped = mapped;
1790    mData = data;
1791    mSize = size;
1792}
1793
1794void Parcel::Blob::clear() {
1795    mMapped = false;
1796    mData = NULL;
1797    mSize = 0;
1798}
1799
1800}; // namespace android
1801