Parcel.cpp revision 4ba492f23b6fb0d5a95174cc194ce04e1497c0d7 
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 <utils/Debug.h>
29#include <utils/Log.h>
30#include <utils/String8.h>
31#include <utils/String16.h>
32#include <utils/misc.h>
33#include <utils/Flattenable.h>
34#include <cutils/ashmem.h>
35
36#include <private/binder/binder_module.h>
37
38#include <stdio.h>
39#include <stdlib.h>
40#include <stdint.h>
41#include <sys/mman.h>
42
43#ifndef INT32_MAX
44#define INT32_MAX ((int32_t)(2147483647))
45#endif
46
47#define LOG_REFS(...)
48//#define LOG_REFS(...) ALOG(LOG_DEBUG, "Parcel", __VA_ARGS__)
49
50// ---------------------------------------------------------------------------
51
52#define PAD_SIZE(s) (((s)+3)&~3)
53
54// Note: must be kept in sync with android/os/StrictMode.java's PENALTY_GATHER
55#define STRICT_MODE_PENALTY_GATHER 0x100
56
57// Note: must be kept in sync with android/os/Parcel.java's EX_HAS_REPLY_HEADER
58#define EX_HAS_REPLY_HEADER -128
59
60// Maximum size of a blob to transfer in-place.
61static const size_t IN_PLACE_BLOB_LIMIT = 40 * 1024;
62
63// XXX This can be made public if we want to provide
64// support for typed data.
65struct small_flat_data
66{
67    uint32_t type;
68    uint32_t data;
69};
70
71namespace android {
72
73void acquire_object(const sp<ProcessState>& proc,
74    const flat_binder_object& obj, const void* who)
75{
76    switch (obj.type) {
77        case BINDER_TYPE_BINDER:
78            if (obj.binder) {
79                LOG_REFS("Parcel %p acquiring reference on local %p", who, obj.cookie);
80                reinterpret_cast<IBinder*>(obj.cookie)->incStrong(who);
81            }
82            return;
83        case BINDER_TYPE_WEAK_BINDER:
84            if (obj.binder)
85                reinterpret_cast<RefBase::weakref_type*>(obj.binder)->incWeak(who);
86            return;
87        case BINDER_TYPE_HANDLE: {
88            const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle);
89            if (b != NULL) {
90                LOG_REFS("Parcel %p acquiring reference on remote %p", who, b.get());
91                b->incStrong(who);
92            }
93            return;
94        }
95        case BINDER_TYPE_WEAK_HANDLE: {
96            const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle);
97            if (b != NULL) b.get_refs()->incWeak(who);
98            return;
99        }
100        case BINDER_TYPE_FD: {
101            // intentionally blank -- nothing to do to acquire this, but we do
102            // recognize it as a legitimate object type.
103            return;
104        }
105    }
106
107    ALOGD("Invalid object type 0x%08x", obj.type);
108}
109
110void release_object(const sp<ProcessState>& proc,
111    const flat_binder_object& obj, const void* who)
112{
113    switch (obj.type) {
114        case BINDER_TYPE_BINDER:
115            if (obj.binder) {
116                LOG_REFS("Parcel %p releasing reference on local %p", who, obj.cookie);
117                reinterpret_cast<IBinder*>(obj.cookie)->decStrong(who);
118            }
119            return;
120        case BINDER_TYPE_WEAK_BINDER:
121            if (obj.binder)
122                reinterpret_cast<RefBase::weakref_type*>(obj.binder)->decWeak(who);
123            return;
124        case BINDER_TYPE_HANDLE: {
125            const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle);
126            if (b != NULL) {
127                LOG_REFS("Parcel %p releasing reference on remote %p", who, b.get());
128                b->decStrong(who);
129            }
130            return;
131        }
132        case BINDER_TYPE_WEAK_HANDLE: {
133            const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle);
134            if (b != NULL) b.get_refs()->decWeak(who);
135            return;
136        }
137        case BINDER_TYPE_FD: {
138            if (obj.cookie != 0) close(obj.handle);
139            return;
140        }
141    }
142
143    ALOGE("Invalid object type 0x%08x", obj.type);
144}
145
146inline static status_t finish_flatten_binder(
147    const sp<IBinder>& /*binder*/, const flat_binder_object& flat, Parcel* out)
148{
149    return out->writeObject(flat, false);
150}
151
152status_t flatten_binder(const sp<ProcessState>& /*proc*/,
153    const sp<IBinder>& binder, Parcel* out)
154{
155    flat_binder_object obj;
156
157    obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS;
158    if (binder != NULL) {
159        IBinder *local = binder->localBinder();
160        if (!local) {
161            BpBinder *proxy = binder->remoteBinder();
162            if (proxy == NULL) {
163                ALOGE("null proxy");
164            }
165            const int32_t handle = proxy ? proxy->handle() : 0;
166            obj.type = BINDER_TYPE_HANDLE;
167            obj.handle = handle;
168            obj.cookie = 0;
169        } else {
170            obj.type = BINDER_TYPE_BINDER;
171            obj.binder = reinterpret_cast<uintptr_t>(local->getWeakRefs());
172            obj.cookie = reinterpret_cast<uintptr_t>(local);
173        }
174    } else {
175        obj.type = BINDER_TYPE_BINDER;
176        obj.binder = 0;
177        obj.cookie = 0;
178    }
179
180    return finish_flatten_binder(binder, obj, out);
181}
182
183status_t flatten_binder(const sp<ProcessState>& /*proc*/,
184    const wp<IBinder>& binder, Parcel* out)
185{
186    flat_binder_object obj;
187
188    obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS;
189    if (binder != NULL) {
190        sp<IBinder> real = binder.promote();
191        if (real != NULL) {
192            IBinder *local = real->localBinder();
193            if (!local) {
194                BpBinder *proxy = real->remoteBinder();
195                if (proxy == NULL) {
196                    ALOGE("null proxy");
197                }
198                const int32_t handle = proxy ? proxy->handle() : 0;
199                obj.type = BINDER_TYPE_WEAK_HANDLE;
200                obj.handle = handle;
201                obj.cookie = 0;
202            } else {
203                obj.type = BINDER_TYPE_WEAK_BINDER;
204                obj.binder = reinterpret_cast<uintptr_t>(binder.get_refs());
205                obj.cookie = reinterpret_cast<uintptr_t>(binder.unsafe_get());
206            }
207            return finish_flatten_binder(real, obj, out);
208        }
209
210        // XXX How to deal?  In order to flatten the given binder,
211        // we need to probe it for information, which requires a primary
212        // reference...  but we don't have one.
213        //
214        // The OpenBinder implementation uses a dynamic_cast<> here,
215        // but we can't do that with the different reference counting
216        // implementation we are using.
217        ALOGE("Unable to unflatten Binder weak reference!");
218        obj.type = BINDER_TYPE_BINDER;
219        obj.binder = 0;
220        obj.cookie = 0;
221        return finish_flatten_binder(NULL, obj, out);
222
223    } else {
224        obj.type = BINDER_TYPE_BINDER;
225        obj.binder = 0;
226        obj.cookie = 0;
227        return finish_flatten_binder(NULL, obj, out);
228    }
229}
230
231inline static status_t finish_unflatten_binder(
232    BpBinder* /*proxy*/, const flat_binder_object& /*flat*/,
233    const Parcel& /*in*/)
234{
235    return NO_ERROR;
236}
237
238status_t unflatten_binder(const sp<ProcessState>& proc,
239    const Parcel& in, sp<IBinder>* out)
240{
241    const flat_binder_object* flat = in.readObject(false);
242
243    if (flat) {
244        switch (flat->type) {
245            case BINDER_TYPE_BINDER:
246                *out = reinterpret_cast<IBinder*>(flat->cookie);
247                return finish_unflatten_binder(NULL, *flat, in);
248            case BINDER_TYPE_HANDLE:
249                *out = proc->getStrongProxyForHandle(flat->handle);
250                return finish_unflatten_binder(
251                    static_cast<BpBinder*>(out->get()), *flat, in);
252        }
253    }
254    return BAD_TYPE;
255}
256
257status_t unflatten_binder(const sp<ProcessState>& proc,
258    const Parcel& in, wp<IBinder>* out)
259{
260    const flat_binder_object* flat = in.readObject(false);
261
262    if (flat) {
263        switch (flat->type) {
264            case BINDER_TYPE_BINDER:
265                *out = reinterpret_cast<IBinder*>(flat->cookie);
266                return finish_unflatten_binder(NULL, *flat, in);
267            case BINDER_TYPE_WEAK_BINDER:
268                if (flat->binder != 0) {
269                    out->set_object_and_refs(
270                        reinterpret_cast<IBinder*>(flat->cookie),
271                        reinterpret_cast<RefBase::weakref_type*>(flat->binder));
272                } else {
273                    *out = NULL;
274                }
275                return finish_unflatten_binder(NULL, *flat, in);
276            case BINDER_TYPE_HANDLE:
277            case BINDER_TYPE_WEAK_HANDLE:
278                *out = proc->getWeakProxyForHandle(flat->handle);
279                return finish_unflatten_binder(
280                    static_cast<BpBinder*>(out->unsafe_get()), *flat, in);
281        }
282    }
283    return BAD_TYPE;
284}
285
286// ---------------------------------------------------------------------------
287
288Parcel::Parcel()
289{
290    initState();
291}
292
293Parcel::~Parcel()
294{
295    freeDataNoInit();
296}
297
298const uint8_t* Parcel::data() const
299{
300    return mData;
301}
302
303size_t Parcel::dataSize() const
304{
305    return (mDataSize > mDataPos ? mDataSize : mDataPos);
306}
307
308size_t Parcel::dataAvail() const
309{
310    // TODO: decide what to do about the possibility that this can
311    // report an available-data size that exceeds a Java int's max
312    // positive value, causing havoc.  Fortunately this will only
313    // happen if someone constructs a Parcel containing more than two
314    // gigabytes of data, which on typical phone hardware is simply
315    // not possible.
316    return dataSize() - dataPosition();
317}
318
319size_t Parcel::dataPosition() const
320{
321    return mDataPos;
322}
323
324size_t Parcel::dataCapacity() const
325{
326    return mDataCapacity;
327}
328
329status_t Parcel::setDataSize(size_t size)
330{
331    status_t err;
332    err = continueWrite(size);
333    if (err == NO_ERROR) {
334        mDataSize = size;
335        ALOGV("setDataSize Setting data size of %p to %d\n", this, mDataSize);
336    }
337    return err;
338}
339
340void Parcel::setDataPosition(size_t pos) const
341{
342    mDataPos = pos;
343    mNextObjectHint = 0;
344}
345
346status_t Parcel::setDataCapacity(size_t size)
347{
348    if (size > mDataCapacity) return continueWrite(size);
349    return NO_ERROR;
350}
351
352status_t Parcel::setData(const uint8_t* buffer, size_t len)
353{
354    status_t err = restartWrite(len);
355    if (err == NO_ERROR) {
356        memcpy(const_cast<uint8_t*>(data()), buffer, len);
357        mDataSize = len;
358        mFdsKnown = false;
359    }
360    return err;
361}
362
363status_t Parcel::appendFrom(const Parcel *parcel, size_t offset, size_t len)
364{
365    const sp<ProcessState> proc(ProcessState::self());
366    status_t err;
367    const uint8_t *data = parcel->mData;
368    const binder_size_t *objects = parcel->mObjects;
369    size_t size = parcel->mObjectsSize;
370    int startPos = mDataPos;
371    int firstIndex = -1, lastIndex = -2;
372
373    if (len == 0) {
374        return NO_ERROR;
375    }
376
377    // range checks against the source parcel size
378    if ((offset > parcel->mDataSize)
379            || (len > parcel->mDataSize)
380            || (offset + len > parcel->mDataSize)) {
381        return BAD_VALUE;
382    }
383
384    // Count objects in range
385    for (int i = 0; i < (int) size; i++) {
386        size_t off = objects[i];
387        if ((off >= offset) && (off < offset + len)) {
388            if (firstIndex == -1) {
389                firstIndex = i;
390            }
391            lastIndex = i;
392        }
393    }
394    int numObjects = lastIndex - firstIndex + 1;
395
396    if ((mDataSize+len) > mDataCapacity) {
397        // grow data
398        err = growData(len);
399        if (err != NO_ERROR) {
400            return err;
401        }
402    }
403
404    // append data
405    memcpy(mData + mDataPos, data + offset, len);
406    mDataPos += len;
407    mDataSize += len;
408
409    err = NO_ERROR;
410
411    if (numObjects > 0) {
412        // grow objects
413        if (mObjectsCapacity < mObjectsSize + numObjects) {
414            int newSize = ((mObjectsSize + numObjects)*3)/2;
415            binder_size_t *objects =
416                (binder_size_t*)realloc(mObjects, newSize*sizeof(binder_size_t));
417            if (objects == (binder_size_t*)0) {
418                return NO_MEMORY;
419            }
420            mObjects = objects;
421            mObjectsCapacity = newSize;
422        }
423
424        // append and acquire objects
425        int idx = mObjectsSize;
426        for (int i = firstIndex; i <= lastIndex; i++) {
427            size_t off = objects[i] - offset + startPos;
428            mObjects[idx++] = off;
429            mObjectsSize++;
430
431            flat_binder_object* flat
432                = reinterpret_cast<flat_binder_object*>(mData + off);
433            acquire_object(proc, *flat, this);
434
435            if (flat->type == BINDER_TYPE_FD) {
436                // If this is a file descriptor, we need to dup it so the
437                // new Parcel now owns its own fd, and can declare that we
438                // officially know we have fds.
439                flat->handle = dup(flat->handle);
440                flat->cookie = 1;
441                mHasFds = mFdsKnown = true;
442                if (!mAllowFds) {
443                    err = FDS_NOT_ALLOWED;
444                }
445            }
446        }
447    }
448
449    return err;
450}
451
452bool Parcel::pushAllowFds(bool allowFds)
453{
454    const bool origValue = mAllowFds;
455    if (!allowFds) {
456        mAllowFds = false;
457    }
458    return origValue;
459}
460
461void Parcel::restoreAllowFds(bool lastValue)
462{
463    mAllowFds = lastValue;
464}
465
466bool Parcel::hasFileDescriptors() const
467{
468    if (!mFdsKnown) {
469        scanForFds();
470    }
471    return mHasFds;
472}
473
474// Write RPC headers.  (previously just the interface token)
475status_t Parcel::writeInterfaceToken(const String16& interface)
476{
477    writeInt32(IPCThreadState::self()->getStrictModePolicy() |
478               STRICT_MODE_PENALTY_GATHER);
479    // currently the interface identification token is just its name as a string
480    return writeString16(interface);
481}
482
483bool Parcel::checkInterface(IBinder* binder) const
484{
485    return enforceInterface(binder->getInterfaceDescriptor());
486}
487
488bool Parcel::enforceInterface(const String16& interface,
489                              IPCThreadState* threadState) const
490{
491    int32_t strictPolicy = readInt32();
492    if (threadState == NULL) {
493        threadState = IPCThreadState::self();
494    }
495    if ((threadState->getLastTransactionBinderFlags() &
496         IBinder::FLAG_ONEWAY) != 0) {
497      // For one-way calls, the callee is running entirely
498      // disconnected from the caller, so disable StrictMode entirely.
499      // Not only does disk/network usage not impact the caller, but
500      // there's no way to commuicate back any violations anyway.
501      threadState->setStrictModePolicy(0);
502    } else {
503      threadState->setStrictModePolicy(strictPolicy);
504    }
505    const String16 str(readString16());
506    if (str == interface) {
507        return true;
508    } else {
509        ALOGW("**** enforceInterface() expected '%s' but read '%s'\n",
510                String8(interface).string(), String8(str).string());
511        return false;
512    }
513}
514
515const binder_size_t* Parcel::objects() const
516{
517    return mObjects;
518}
519
520size_t Parcel::objectsCount() const
521{
522    return mObjectsSize;
523}
524
525status_t Parcel::errorCheck() const
526{
527    return mError;
528}
529
530void Parcel::setError(status_t err)
531{
532    mError = err;
533}
534
535status_t Parcel::finishWrite(size_t len)
536{
537    //printf("Finish write of %d\n", len);
538    mDataPos += len;
539    ALOGV("finishWrite Setting data pos of %p to %d\n", this, mDataPos);
540    if (mDataPos > mDataSize) {
541        mDataSize = mDataPos;
542        ALOGV("finishWrite Setting data size of %p to %d\n", this, mDataSize);
543    }
544    //printf("New pos=%d, size=%d\n", mDataPos, mDataSize);
545    return NO_ERROR;
546}
547
548status_t Parcel::writeUnpadded(const void* data, size_t len)
549{
550    size_t end = mDataPos + len;
551    if (end < mDataPos) {
552        // integer overflow
553        return BAD_VALUE;
554    }
555
556    if (end <= mDataCapacity) {
557restart_write:
558        memcpy(mData+mDataPos, data, len);
559        return finishWrite(len);
560    }
561
562    status_t err = growData(len);
563    if (err == NO_ERROR) goto restart_write;
564    return err;
565}
566
567status_t Parcel::write(const void* data, size_t len)
568{
569    void* const d = writeInplace(len);
570    if (d) {
571        memcpy(d, data, len);
572        return NO_ERROR;
573    }
574    return mError;
575}
576
577void* Parcel::writeInplace(size_t len)
578{
579    const size_t padded = PAD_SIZE(len);
580
581    // sanity check for integer overflow
582    if (mDataPos+padded < mDataPos) {
583        return NULL;
584    }
585
586    if ((mDataPos+padded) <= mDataCapacity) {
587restart_write:
588        //printf("Writing %ld bytes, padded to %ld\n", len, padded);
589        uint8_t* const data = mData+mDataPos;
590
591        // Need to pad at end?
592        if (padded != len) {
593#if BYTE_ORDER == BIG_ENDIAN
594            static const uint32_t mask[4] = {
595                0x00000000, 0xffffff00, 0xffff0000, 0xff000000
596            };
597#endif
598#if BYTE_ORDER == LITTLE_ENDIAN
599            static const uint32_t mask[4] = {
600                0x00000000, 0x00ffffff, 0x0000ffff, 0x000000ff
601            };
602#endif
603            //printf("Applying pad mask: %p to %p\n", (void*)mask[padded-len],
604            //    *reinterpret_cast<void**>(data+padded-4));
605            *reinterpret_cast<uint32_t*>(data+padded-4) &= mask[padded-len];
606        }
607
608        finishWrite(padded);
609        return data;
610    }
611
612    status_t err = growData(padded);
613    if (err == NO_ERROR) goto restart_write;
614    return NULL;
615}
616
617status_t Parcel::writeInt32(int32_t val)
618{
619    return writeAligned(val);
620}
621status_t Parcel::writeInt32Array(size_t len, const int32_t *val) {
622    if (!val) {
623        return writeAligned(-1);
624    }
625    status_t ret = writeAligned(len);
626    if (ret == NO_ERROR) {
627        ret = write(val, len * sizeof(*val));
628    }
629    return ret;
630}
631
632status_t Parcel::writeInt64(int64_t val)
633{
634    return writeAligned(val);
635}
636
637status_t Parcel::writePointer(uintptr_t val)
638{
639    return writeAligned<binder_uintptr_t>(val);
640}
641
642status_t Parcel::writeFloat(float val)
643{
644    return writeAligned(val);
645}
646
647#if defined(__mips__) && defined(__mips_hard_float)
648
649status_t Parcel::writeDouble(double val)
650{
651    union {
652        double d;
653        unsigned long long ll;
654    } u;
655    u.d = val;
656    return writeAligned(u.ll);
657}
658
659#else
660
661status_t Parcel::writeDouble(double val)
662{
663    return writeAligned(val);
664}
665
666#endif
667
668status_t Parcel::writeIntPtr(intptr_t val)
669{
670    return writeAligned(val);
671}
672
673status_t Parcel::writeCString(const char* str)
674{
675    return write(str, strlen(str)+1);
676}
677
678status_t Parcel::writeString8(const String8& str)
679{
680    status_t err = writeInt32(str.bytes());
681    // only write string if its length is more than zero characters,
682    // as readString8 will only read if the length field is non-zero.
683    // this is slightly different from how writeString16 works.
684    if (str.bytes() > 0 && err == NO_ERROR) {
685        err = write(str.string(), str.bytes()+1);
686    }
687    return err;
688}
689
690status_t Parcel::writeString16(const String16& str)
691{
692    return writeString16(str.string(), str.size());
693}
694
695status_t Parcel::writeString16(const char16_t* str, size_t len)
696{
697    if (str == NULL) return writeInt32(-1);
698
699    status_t err = writeInt32(len);
700    if (err == NO_ERROR) {
701        len *= sizeof(char16_t);
702        uint8_t* data = (uint8_t*)writeInplace(len+sizeof(char16_t));
703        if (data) {
704            memcpy(data, str, len);
705            *reinterpret_cast<char16_t*>(data+len) = 0;
706            return NO_ERROR;
707        }
708        err = mError;
709    }
710    return err;
711}
712
713status_t Parcel::writeStrongBinder(const sp<IBinder>& val)
714{
715    return flatten_binder(ProcessState::self(), val, this);
716}
717
718status_t Parcel::writeWeakBinder(const wp<IBinder>& val)
719{
720    return flatten_binder(ProcessState::self(), val, this);
721}
722
723status_t Parcel::writeNativeHandle(const native_handle* handle)
724{
725    if (!handle || handle->version != sizeof(native_handle))
726        return BAD_TYPE;
727
728    status_t err;
729    err = writeInt32(handle->numFds);
730    if (err != NO_ERROR) return err;
731
732    err = writeInt32(handle->numInts);
733    if (err != NO_ERROR) return err;
734
735    for (int i=0 ; err==NO_ERROR && i<handle->numFds ; i++)
736        err = writeDupFileDescriptor(handle->data[i]);
737
738    if (err != NO_ERROR) {
739        ALOGD("write native handle, write dup fd failed");
740        return err;
741    }
742    err = write(handle->data + handle->numFds, sizeof(int)*handle->numInts);
743    return err;
744}
745
746status_t Parcel::writeFileDescriptor(int fd, bool takeOwnership)
747{
748    flat_binder_object obj;
749    obj.type = BINDER_TYPE_FD;
750    obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS;
751    obj.handle = fd;
752    obj.cookie = takeOwnership ? 1 : 0;
753    return writeObject(obj, true);
754}
755
756status_t Parcel::writeDupFileDescriptor(int fd)
757{
758    int dupFd = dup(fd);
759    if (dupFd < 0) {
760        return -errno;
761    }
762    status_t err = writeFileDescriptor(dupFd, true /*takeOwnership*/);
763    if (err) {
764        close(dupFd);
765    }
766    return err;
767}
768
769// WARNING: This method must stay in sync with
770// Parcelable.Creator<ParcelFileDescriptor> CREATOR
771// in frameworks/base/core/java/android/os/ParcelFileDescriptor.java
772status_t Parcel::writeParcelFileDescriptor(int fd, int commChannel) {
773    status_t status;
774
775    if (fd < 0) {
776        status = writeInt32(0); // ParcelFileDescriptor is null
777        if (status) return status;
778    } else {
779        status = writeInt32(1); // ParcelFileDescriptor is not null
780        if (status) return status;
781        status = writeDupFileDescriptor(fd);
782        if (status) return status;
783        if (commChannel < 0) {
784            status = writeInt32(0); // commChannel is null
785            if (status) return status;
786        } else {
787            status = writeInt32(1); // commChannel is not null
788            if (status) return status;
789            status = writeDupFileDescriptor(commChannel);
790        }
791    }
792    return status;
793}
794
795status_t Parcel::writeBlob(size_t len, WritableBlob* outBlob)
796{
797    status_t status;
798
799    if (!mAllowFds || len <= IN_PLACE_BLOB_LIMIT) {
800        ALOGV("writeBlob: write in place");
801        status = writeInt32(0);
802        if (status) return status;
803
804        void* ptr = writeInplace(len);
805        if (!ptr) return NO_MEMORY;
806
807        outBlob->init(false /*mapped*/, ptr, len);
808        return NO_ERROR;
809    }
810
811    ALOGV("writeBlob: write to ashmem");
812    int fd = ashmem_create_region("Parcel Blob", len);
813    if (fd < 0) return NO_MEMORY;
814
815    int result = ashmem_set_prot_region(fd, PROT_READ | PROT_WRITE);
816    if (result < 0) {
817        status = result;
818    } else {
819        void* ptr = ::mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
820        if (ptr == MAP_FAILED) {
821            status = -errno;
822        } else {
823            result = ashmem_set_prot_region(fd, PROT_READ);
824            if (result < 0) {
825                status = result;
826            } else {
827                status = writeInt32(1);
828                if (!status) {
829                    status = writeFileDescriptor(fd, true /*takeOwnership*/);
830                    if (!status) {
831                        outBlob->init(true /*mapped*/, ptr, len);
832                        return NO_ERROR;
833                    }
834                }
835            }
836        }
837        ::munmap(ptr, len);
838    }
839    ::close(fd);
840    return status;
841}
842
843status_t Parcel::write(const FlattenableHelperInterface& val)
844{
845    status_t err;
846
847    // size if needed
848    const size_t len = val.getFlattenedSize();
849    const size_t fd_count = val.getFdCount();
850
851    err = this->writeInt32(len);
852    if (err) return err;
853
854    err = this->writeInt32(fd_count);
855    if (err) return err;
856
857    // payload
858    void* const buf = this->writeInplace(PAD_SIZE(len));
859    if (buf == NULL)
860        return BAD_VALUE;
861
862    int* fds = NULL;
863    if (fd_count) {
864        fds = new int[fd_count];
865    }
866
867    err = val.flatten(buf, len, fds, fd_count);
868    for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) {
869        err = this->writeDupFileDescriptor( fds[i] );
870    }
871
872    if (fd_count) {
873        delete [] fds;
874    }
875
876    return err;
877}
878
879status_t Parcel::writeObject(const flat_binder_object& val, bool nullMetaData)
880{
881    const bool enoughData = (mDataPos+sizeof(val)) <= mDataCapacity;
882    const bool enoughObjects = mObjectsSize < mObjectsCapacity;
883    if (enoughData && enoughObjects) {
884restart_write:
885        *reinterpret_cast<flat_binder_object*>(mData+mDataPos) = val;
886
887        // Need to write meta-data?
888        if (nullMetaData || val.binder != 0) {
889            mObjects[mObjectsSize] = mDataPos;
890            acquire_object(ProcessState::self(), val, this);
891            mObjectsSize++;
892        }
893
894        // remember if it's a file descriptor
895        if (val.type == BINDER_TYPE_FD) {
896            if (!mAllowFds) {
897                return FDS_NOT_ALLOWED;
898            }
899            mHasFds = mFdsKnown = true;
900        }
901
902        return finishWrite(sizeof(flat_binder_object));
903    }
904
905    if (!enoughData) {
906        const status_t err = growData(sizeof(val));
907        if (err != NO_ERROR) return err;
908    }
909    if (!enoughObjects) {
910        size_t newSize = ((mObjectsSize+2)*3)/2;
911        binder_size_t* objects = (binder_size_t*)realloc(mObjects, newSize*sizeof(binder_size_t));
912        if (objects == NULL) return NO_MEMORY;
913        mObjects = objects;
914        mObjectsCapacity = newSize;
915    }
916
917    goto restart_write;
918}
919
920status_t Parcel::writeNoException()
921{
922    return writeInt32(0);
923}
924
925void Parcel::remove(size_t /*start*/, size_t /*amt*/)
926{
927    LOG_ALWAYS_FATAL("Parcel::remove() not yet implemented!");
928}
929
930status_t Parcel::read(void* outData, size_t len) const
931{
932    if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize) {
933        memcpy(outData, mData+mDataPos, len);
934        mDataPos += PAD_SIZE(len);
935        ALOGV("read Setting data pos of %p to %d\n", this, mDataPos);
936        return NO_ERROR;
937    }
938    return NOT_ENOUGH_DATA;
939}
940
941const void* Parcel::readInplace(size_t len) const
942{
943    if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize) {
944        const void* data = mData+mDataPos;
945        mDataPos += PAD_SIZE(len);
946        ALOGV("readInplace Setting data pos of %p to %d\n", this, mDataPos);
947        return data;
948    }
949    return NULL;
950}
951
952template<class T>
953status_t Parcel::readAligned(T *pArg) const {
954    COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE(sizeof(T)) == sizeof(T));
955
956    if ((mDataPos+sizeof(T)) <= mDataSize) {
957        const void* data = mData+mDataPos;
958        mDataPos += sizeof(T);
959        *pArg =  *reinterpret_cast<const T*>(data);
960        return NO_ERROR;
961    } else {
962        return NOT_ENOUGH_DATA;
963    }
964}
965
966template<class T>
967T Parcel::readAligned() const {
968    T result;
969    if (readAligned(&result) != NO_ERROR) {
970        result = 0;
971    }
972
973    return result;
974}
975
976template<class T>
977status_t Parcel::writeAligned(T val) {
978    COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE(sizeof(T)) == sizeof(T));
979
980    if ((mDataPos+sizeof(val)) <= mDataCapacity) {
981restart_write:
982        *reinterpret_cast<T*>(mData+mDataPos) = val;
983        return finishWrite(sizeof(val));
984    }
985
986    status_t err = growData(sizeof(val));
987    if (err == NO_ERROR) goto restart_write;
988    return err;
989}
990
991status_t Parcel::readInt32(int32_t *pArg) const
992{
993    return readAligned(pArg);
994}
995
996int32_t Parcel::readInt32() const
997{
998    return readAligned<int32_t>();
999}
1000
1001
1002status_t Parcel::readInt64(int64_t *pArg) const
1003{
1004    return readAligned(pArg);
1005}
1006
1007
1008int64_t Parcel::readInt64() const
1009{
1010    return readAligned<int64_t>();
1011}
1012
1013status_t Parcel::readPointer(uintptr_t *pArg) const
1014{
1015    status_t ret;
1016    binder_uintptr_t ptr;
1017    ret = readAligned(&ptr);
1018    if (!ret)
1019        *pArg = ptr;
1020    return ret;
1021}
1022
1023uintptr_t Parcel::readPointer() const
1024{
1025    return readAligned<binder_uintptr_t>();
1026}
1027
1028
1029status_t Parcel::readFloat(float *pArg) const
1030{
1031    return readAligned(pArg);
1032}
1033
1034
1035float Parcel::readFloat() const
1036{
1037    return readAligned<float>();
1038}
1039
1040#if defined(__mips__) && defined(__mips_hard_float)
1041
1042status_t Parcel::readDouble(double *pArg) const
1043{
1044    union {
1045      double d;
1046      unsigned long long ll;
1047    } u;
1048    status_t status;
1049    status = readAligned(&u.ll);
1050    *pArg = u.d;
1051    return status;
1052}
1053
1054double Parcel::readDouble() const
1055{
1056    union {
1057      double d;
1058      unsigned long long ll;
1059    } u;
1060    u.ll = readAligned<unsigned long long>();
1061    return u.d;
1062}
1063
1064#else
1065
1066status_t Parcel::readDouble(double *pArg) const
1067{
1068    return readAligned(pArg);
1069}
1070
1071double Parcel::readDouble() const
1072{
1073    return readAligned<double>();
1074}
1075
1076#endif
1077
1078status_t Parcel::readIntPtr(intptr_t *pArg) const
1079{
1080    return readAligned(pArg);
1081}
1082
1083
1084intptr_t Parcel::readIntPtr() const
1085{
1086    return readAligned<intptr_t>();
1087}
1088
1089
1090const char* Parcel::readCString() const
1091{
1092    const size_t avail = mDataSize-mDataPos;
1093    if (avail > 0) {
1094        const char* str = reinterpret_cast<const char*>(mData+mDataPos);
1095        // is the string's trailing NUL within the parcel's valid bounds?
1096        const char* eos = reinterpret_cast<const char*>(memchr(str, 0, avail));
1097        if (eos) {
1098            const size_t len = eos - str;
1099            mDataPos += PAD_SIZE(len+1);
1100            ALOGV("readCString Setting data pos of %p to %d\n", this, mDataPos);
1101            return str;
1102        }
1103    }
1104    return NULL;
1105}
1106
1107String8 Parcel::readString8() const
1108{
1109    int32_t size = readInt32();
1110    // watch for potential int overflow adding 1 for trailing NUL
1111    if (size > 0 && size < INT32_MAX) {
1112        const char* str = (const char*)readInplace(size+1);
1113        if (str) return String8(str, size);
1114    }
1115    return String8();
1116}
1117
1118String16 Parcel::readString16() const
1119{
1120    size_t len;
1121    const char16_t* str = readString16Inplace(&len);
1122    if (str) return String16(str, len);
1123    ALOGE("Reading a NULL string not supported here.");
1124    return String16();
1125}
1126
1127const char16_t* Parcel::readString16Inplace(size_t* outLen) const
1128{
1129    int32_t size = readInt32();
1130    // watch for potential int overflow from size+1
1131    if (size >= 0 && size < INT32_MAX) {
1132        *outLen = size;
1133        const char16_t* str = (const char16_t*)readInplace((size+1)*sizeof(char16_t));
1134        if (str != NULL) {
1135            return str;
1136        }
1137    }
1138    *outLen = 0;
1139    return NULL;
1140}
1141
1142sp<IBinder> Parcel::readStrongBinder() const
1143{
1144    sp<IBinder> val;
1145    unflatten_binder(ProcessState::self(), *this, &val);
1146    return val;
1147}
1148
1149wp<IBinder> Parcel::readWeakBinder() const
1150{
1151    wp<IBinder> val;
1152    unflatten_binder(ProcessState::self(), *this, &val);
1153    return val;
1154}
1155
1156int32_t Parcel::readExceptionCode() const
1157{
1158  int32_t exception_code = readAligned<int32_t>();
1159  if (exception_code == EX_HAS_REPLY_HEADER) {
1160    int32_t header_start = dataPosition();
1161    int32_t header_size = readAligned<int32_t>();
1162    // Skip over fat responses headers.  Not used (or propagated) in
1163    // native code
1164    setDataPosition(header_start + header_size);
1165    // And fat response headers are currently only used when there are no
1166    // exceptions, so return no error:
1167    return 0;
1168  }
1169  return exception_code;
1170}
1171
1172native_handle* Parcel::readNativeHandle() const
1173{
1174    int numFds, numInts;
1175    status_t err;
1176    err = readInt32(&numFds);
1177    if (err != NO_ERROR) return 0;
1178    err = readInt32(&numInts);
1179    if (err != NO_ERROR) return 0;
1180
1181    native_handle* h = native_handle_create(numFds, numInts);
1182    for (int i=0 ; err==NO_ERROR && i<numFds ; i++) {
1183        h->data[i] = dup(readFileDescriptor());
1184        if (h->data[i] < 0) err = BAD_VALUE;
1185    }
1186    err = read(h->data + numFds, sizeof(int)*numInts);
1187    if (err != NO_ERROR) {
1188        native_handle_close(h);
1189        native_handle_delete(h);
1190        h = 0;
1191    }
1192    return h;
1193}
1194
1195
1196int Parcel::readFileDescriptor() const
1197{
1198    const flat_binder_object* flat = readObject(true);
1199    if (flat) {
1200        switch (flat->type) {
1201            case BINDER_TYPE_FD:
1202                //ALOGI("Returning file descriptor %ld from parcel %p\n", flat->handle, this);
1203                return flat->handle;
1204        }
1205    }
1206    return BAD_TYPE;
1207}
1208
1209// WARNING: This method must stay in sync with writeToParcel()
1210// in frameworks/base/core/java/android/os/ParcelFileDescriptor.java
1211int Parcel::readParcelFileDescriptor(int& outCommChannel) const {
1212    int fd;
1213    outCommChannel = -1;
1214
1215    if (readInt32() == 0) {
1216        fd = -1;
1217    } else {
1218        fd = readFileDescriptor();
1219        if (fd >= 0 && readInt32() != 0) {
1220            outCommChannel = readFileDescriptor();
1221        }
1222    }
1223    return fd;
1224}
1225
1226status_t Parcel::readBlob(size_t len, ReadableBlob* outBlob) const
1227{
1228    int32_t useAshmem;
1229    status_t status = readInt32(&useAshmem);
1230    if (status) return status;
1231
1232    if (!useAshmem) {
1233        ALOGV("readBlob: read in place");
1234        const void* ptr = readInplace(len);
1235        if (!ptr) return BAD_VALUE;
1236
1237        outBlob->init(false /*mapped*/, const_cast<void*>(ptr), len);
1238        return NO_ERROR;
1239    }
1240
1241    ALOGV("readBlob: read from ashmem");
1242    int fd = readFileDescriptor();
1243    if (fd == int(BAD_TYPE)) return BAD_VALUE;
1244
1245    void* ptr = ::mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0);
1246    if (!ptr) return NO_MEMORY;
1247
1248    outBlob->init(true /*mapped*/, ptr, len);
1249    return NO_ERROR;
1250}
1251
1252status_t Parcel::read(FlattenableHelperInterface& val) const
1253{
1254    // size
1255    const size_t len = this->readInt32();
1256    const size_t fd_count = this->readInt32();
1257
1258    // payload
1259    void const* const buf = this->readInplace(PAD_SIZE(len));
1260    if (buf == NULL)
1261        return BAD_VALUE;
1262
1263    int* fds = NULL;
1264    if (fd_count) {
1265        fds = new int[fd_count];
1266    }
1267
1268    status_t err = NO_ERROR;
1269    for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) {
1270        fds[i] = dup(this->readFileDescriptor());
1271        if (fds[i] < 0) err = BAD_VALUE;
1272    }
1273
1274    if (err == NO_ERROR) {
1275        err = val.unflatten(buf, len, fds, fd_count);
1276    }
1277
1278    if (fd_count) {
1279        delete [] fds;
1280    }
1281
1282    return err;
1283}
1284const flat_binder_object* Parcel::readObject(bool nullMetaData) const
1285{
1286    const size_t DPOS = mDataPos;
1287    if ((DPOS+sizeof(flat_binder_object)) <= mDataSize) {
1288        const flat_binder_object* obj
1289                = reinterpret_cast<const flat_binder_object*>(mData+DPOS);
1290        mDataPos = DPOS + sizeof(flat_binder_object);
1291        if (!nullMetaData && (obj->cookie == 0 && obj->binder == 0)) {
1292            // When transferring a NULL object, we don't write it into
1293            // the object list, so we don't want to check for it when
1294            // reading.
1295            ALOGV("readObject Setting data pos of %p to %d\n", this, mDataPos);
1296            return obj;
1297        }
1298
1299        // Ensure that this object is valid...
1300        binder_size_t* const OBJS = mObjects;
1301        const size_t N = mObjectsSize;
1302        size_t opos = mNextObjectHint;
1303
1304        if (N > 0) {
1305            ALOGV("Parcel %p looking for obj at %d, hint=%d\n",
1306                 this, DPOS, opos);
1307
1308            // Start at the current hint position, looking for an object at
1309            // the current data position.
1310            if (opos < N) {
1311                while (opos < (N-1) && OBJS[opos] < DPOS) {
1312                    opos++;
1313                }
1314            } else {
1315                opos = N-1;
1316            }
1317            if (OBJS[opos] == DPOS) {
1318                // Found it!
1319                ALOGV("Parcel found obj %d at index %d with forward search",
1320                     this, DPOS, opos);
1321                mNextObjectHint = opos+1;
1322                ALOGV("readObject Setting data pos of %p to %d\n", this, mDataPos);
1323                return obj;
1324            }
1325
1326            // Look backwards for it...
1327            while (opos > 0 && OBJS[opos] > DPOS) {
1328                opos--;
1329            }
1330            if (OBJS[opos] == DPOS) {
1331                // Found it!
1332                ALOGV("Parcel found obj %d at index %d with backward search",
1333                     this, DPOS, opos);
1334                mNextObjectHint = opos+1;
1335                ALOGV("readObject Setting data pos of %p to %d\n", this, mDataPos);
1336                return obj;
1337            }
1338        }
1339        ALOGW("Attempt to read object from Parcel %p at offset %zu that is not in the object list",
1340             this, DPOS);
1341    }
1342    return NULL;
1343}
1344
1345void Parcel::closeFileDescriptors()
1346{
1347    size_t i = mObjectsSize;
1348    if (i > 0) {
1349        //ALOGI("Closing file descriptors for %d objects...", mObjectsSize);
1350    }
1351    while (i > 0) {
1352        i--;
1353        const flat_binder_object* flat
1354            = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]);
1355        if (flat->type == BINDER_TYPE_FD) {
1356            //ALOGI("Closing fd: %ld\n", flat->handle);
1357            close(flat->handle);
1358        }
1359    }
1360}
1361
1362uintptr_t Parcel::ipcData() const
1363{
1364    return reinterpret_cast<uintptr_t>(mData);
1365}
1366
1367size_t Parcel::ipcDataSize() const
1368{
1369    return (mDataSize > mDataPos ? mDataSize : mDataPos);
1370}
1371
1372uintptr_t Parcel::ipcObjects() const
1373{
1374    return reinterpret_cast<uintptr_t>(mObjects);
1375}
1376
1377size_t Parcel::ipcObjectsCount() const
1378{
1379    return mObjectsSize;
1380}
1381
1382void Parcel::ipcSetDataReference(const uint8_t* data, size_t dataSize,
1383    const binder_size_t* objects, size_t objectsCount, release_func relFunc, void* relCookie)
1384{
1385    freeDataNoInit();
1386    mError = NO_ERROR;
1387    mData = const_cast<uint8_t*>(data);
1388    mDataSize = mDataCapacity = dataSize;
1389    //ALOGI("setDataReference Setting data size of %p to %lu (pid=%d)\n", this, mDataSize, getpid());
1390    mDataPos = 0;
1391    ALOGV("setDataReference Setting data pos of %p to %d\n", this, mDataPos);
1392    mObjects = const_cast<binder_size_t*>(objects);
1393    mObjectsSize = mObjectsCapacity = objectsCount;
1394    mNextObjectHint = 0;
1395    mOwner = relFunc;
1396    mOwnerCookie = relCookie;
1397    scanForFds();
1398}
1399
1400void Parcel::print(TextOutput& to, uint32_t /*flags*/) const
1401{
1402    to << "Parcel(";
1403
1404    if (errorCheck() != NO_ERROR) {
1405        const status_t err = errorCheck();
1406        to << "Error: " << (void*)(intptr_t)err << " \"" << strerror(-err) << "\"";
1407    } else if (dataSize() > 0) {
1408        const uint8_t* DATA = data();
1409        to << indent << HexDump(DATA, dataSize()) << dedent;
1410        const binder_size_t* OBJS = objects();
1411        const size_t N = objectsCount();
1412        for (size_t i=0; i<N; i++) {
1413            const flat_binder_object* flat
1414                = reinterpret_cast<const flat_binder_object*>(DATA+OBJS[i]);
1415            to << endl << "Object #" << i << " @ " << (void*)OBJS[i] << ": "
1416                << TypeCode(flat->type & 0x7f7f7f00)
1417                << " = " << flat->binder;
1418        }
1419    } else {
1420        to << "NULL";
1421    }
1422
1423    to << ")";
1424}
1425
1426void Parcel::releaseObjects()
1427{
1428    const sp<ProcessState> proc(ProcessState::self());
1429    size_t i = mObjectsSize;
1430    uint8_t* const data = mData;
1431    binder_size_t* const objects = mObjects;
1432    while (i > 0) {
1433        i--;
1434        const flat_binder_object* flat
1435            = reinterpret_cast<flat_binder_object*>(data+objects[i]);
1436        release_object(proc, *flat, this);
1437    }
1438}
1439
1440void Parcel::acquireObjects()
1441{
1442    const sp<ProcessState> proc(ProcessState::self());
1443    size_t i = mObjectsSize;
1444    uint8_t* const data = mData;
1445    binder_size_t* const objects = mObjects;
1446    while (i > 0) {
1447        i--;
1448        const flat_binder_object* flat
1449            = reinterpret_cast<flat_binder_object*>(data+objects[i]);
1450        acquire_object(proc, *flat, this);
1451    }
1452}
1453
1454void Parcel::freeData()
1455{
1456    freeDataNoInit();
1457    initState();
1458}
1459
1460void Parcel::freeDataNoInit()
1461{
1462    if (mOwner) {
1463        //ALOGI("Freeing data ref of %p (pid=%d)\n", this, getpid());
1464        mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie);
1465    } else {
1466        releaseObjects();
1467        if (mData) free(mData);
1468        if (mObjects) free(mObjects);
1469    }
1470}
1471
1472status_t Parcel::growData(size_t len)
1473{
1474    size_t newSize = ((mDataSize+len)*3)/2;
1475    return (newSize <= mDataSize)
1476            ? (status_t) NO_MEMORY
1477            : continueWrite(newSize);
1478}
1479
1480status_t Parcel::restartWrite(size_t desired)
1481{
1482    if (mOwner) {
1483        freeData();
1484        return continueWrite(desired);
1485    }
1486
1487    uint8_t* data = (uint8_t*)realloc(mData, desired);
1488    if (!data && desired > mDataCapacity) {
1489        mError = NO_MEMORY;
1490        return NO_MEMORY;
1491    }
1492
1493    releaseObjects();
1494
1495    if (data) {
1496        mData = data;
1497        mDataCapacity = desired;
1498    }
1499
1500    mDataSize = mDataPos = 0;
1501    ALOGV("restartWrite Setting data size of %p to %d\n", this, mDataSize);
1502    ALOGV("restartWrite Setting data pos of %p to %d\n", this, mDataPos);
1503
1504    free(mObjects);
1505    mObjects = NULL;
1506    mObjectsSize = mObjectsCapacity = 0;
1507    mNextObjectHint = 0;
1508    mHasFds = false;
1509    mFdsKnown = true;
1510    mAllowFds = true;
1511
1512    return NO_ERROR;
1513}
1514
1515status_t Parcel::continueWrite(size_t desired)
1516{
1517    // If shrinking, first adjust for any objects that appear
1518    // after the new data size.
1519    size_t objectsSize = mObjectsSize;
1520    if (desired < mDataSize) {
1521        if (desired == 0) {
1522            objectsSize = 0;
1523        } else {
1524            while (objectsSize > 0) {
1525                if (mObjects[objectsSize-1] < desired)
1526                    break;
1527                objectsSize--;
1528            }
1529        }
1530    }
1531
1532    if (mOwner) {
1533        // If the size is going to zero, just release the owner's data.
1534        if (desired == 0) {
1535            freeData();
1536            return NO_ERROR;
1537        }
1538
1539        // If there is a different owner, we need to take
1540        // posession.
1541        uint8_t* data = (uint8_t*)malloc(desired);
1542        if (!data) {
1543            mError = NO_MEMORY;
1544            return NO_MEMORY;
1545        }
1546        binder_size_t* objects = NULL;
1547
1548        if (objectsSize) {
1549            objects = (binder_size_t*)malloc(objectsSize*sizeof(binder_size_t));
1550            if (!objects) {
1551                free(data);
1552
1553                mError = NO_MEMORY;
1554                return NO_MEMORY;
1555            }
1556
1557            // Little hack to only acquire references on objects
1558            // we will be keeping.
1559            size_t oldObjectsSize = mObjectsSize;
1560            mObjectsSize = objectsSize;
1561            acquireObjects();
1562            mObjectsSize = oldObjectsSize;
1563        }
1564
1565        if (mData) {
1566            memcpy(data, mData, mDataSize < desired ? mDataSize : desired);
1567        }
1568        if (objects && mObjects) {
1569            memcpy(objects, mObjects, objectsSize*sizeof(binder_size_t));
1570        }
1571        //ALOGI("Freeing data ref of %p (pid=%d)\n", this, getpid());
1572        mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie);
1573        mOwner = NULL;
1574
1575        mData = data;
1576        mObjects = objects;
1577        mDataSize = (mDataSize < desired) ? mDataSize : desired;
1578        ALOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize);
1579        mDataCapacity = desired;
1580        mObjectsSize = mObjectsCapacity = objectsSize;
1581        mNextObjectHint = 0;
1582
1583    } else if (mData) {
1584        if (objectsSize < mObjectsSize) {
1585            // Need to release refs on any objects we are dropping.
1586            const sp<ProcessState> proc(ProcessState::self());
1587            for (size_t i=objectsSize; i<mObjectsSize; i++) {
1588                const flat_binder_object* flat
1589                    = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]);
1590                if (flat->type == BINDER_TYPE_FD) {
1591                    // will need to rescan because we may have lopped off the only FDs
1592                    mFdsKnown = false;
1593                }
1594                release_object(proc, *flat, this);
1595            }
1596            binder_size_t* objects =
1597                (binder_size_t*)realloc(mObjects, objectsSize*sizeof(binder_size_t));
1598            if (objects) {
1599                mObjects = objects;
1600            }
1601            mObjectsSize = objectsSize;
1602            mNextObjectHint = 0;
1603        }
1604
1605        // We own the data, so we can just do a realloc().
1606        if (desired > mDataCapacity) {
1607            uint8_t* data = (uint8_t*)realloc(mData, desired);
1608            if (data) {
1609                mData = data;
1610                mDataCapacity = desired;
1611            } else if (desired > mDataCapacity) {
1612                mError = NO_MEMORY;
1613                return NO_MEMORY;
1614            }
1615        } else {
1616            if (mDataSize > desired) {
1617                mDataSize = desired;
1618                ALOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize);
1619            }
1620            if (mDataPos > desired) {
1621                mDataPos = desired;
1622                ALOGV("continueWrite Setting data pos of %p to %d\n", this, mDataPos);
1623            }
1624        }
1625
1626    } else {
1627        // This is the first data.  Easy!
1628        uint8_t* data = (uint8_t*)malloc(desired);
1629        if (!data) {
1630            mError = NO_MEMORY;
1631            return NO_MEMORY;
1632        }
1633
1634        if(!(mDataCapacity == 0 && mObjects == NULL
1635             && mObjectsCapacity == 0)) {
1636            ALOGE("continueWrite: %zu/%p/%zu/%zu", mDataCapacity, mObjects, mObjectsCapacity, desired);
1637        }
1638
1639        mData = data;
1640        mDataSize = mDataPos = 0;
1641        ALOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize);
1642        ALOGV("continueWrite Setting data pos of %p to %d\n", this, mDataPos);
1643        mDataCapacity = desired;
1644    }
1645
1646    return NO_ERROR;
1647}
1648
1649void Parcel::initState()
1650{
1651    mError = NO_ERROR;
1652    mData = 0;
1653    mDataSize = 0;
1654    mDataCapacity = 0;
1655    mDataPos = 0;
1656    ALOGV("initState Setting data size of %p to %d\n", this, mDataSize);
1657    ALOGV("initState Setting data pos of %p to %d\n", this, mDataPos);
1658    mObjects = NULL;
1659    mObjectsSize = 0;
1660    mObjectsCapacity = 0;
1661    mNextObjectHint = 0;
1662    mHasFds = false;
1663    mFdsKnown = true;
1664    mAllowFds = true;
1665    mOwner = NULL;
1666}
1667
1668void Parcel::scanForFds() const
1669{
1670    bool hasFds = false;
1671    for (size_t i=0; i<mObjectsSize; i++) {
1672        const flat_binder_object* flat
1673            = reinterpret_cast<const flat_binder_object*>(mData + mObjects[i]);
1674        if (flat->type == BINDER_TYPE_FD) {
1675            hasFds = true;
1676            break;
1677        }
1678    }
1679    mHasFds = hasFds;
1680    mFdsKnown = true;
1681}
1682
1683// --- Parcel::Blob ---
1684
1685Parcel::Blob::Blob() :
1686        mMapped(false), mData(NULL), mSize(0) {
1687}
1688
1689Parcel::Blob::~Blob() {
1690    release();
1691}
1692
1693void Parcel::Blob::release() {
1694    if (mMapped && mData) {
1695        ::munmap(mData, mSize);
1696    }
1697    clear();
1698}
1699
1700void Parcel::Blob::init(bool mapped, void* data, size_t size) {
1701    mMapped = mapped;
1702    mData = data;
1703    mSize = size;
1704}
1705
1706void Parcel::Blob::clear() {
1707    mMapped = false;
1708    mData = NULL;
1709    mSize = 0;
1710}
1711
1712}; // namespace android
1713