Parcel.cpp revision cbe36fe1ec21e22e6649d47144c91260ba51d753 
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                static_cast<IBinder*>(obj.cookie)->incStrong(who);
81            }
82            return;
83        case BINDER_TYPE_WEAK_BINDER:
84            if (obj.binder)
85                static_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%08lx", 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                static_cast<IBinder*>(obj.cookie)->decStrong(who);
118            }
119            return;
120        case BINDER_TYPE_WEAK_BINDER:
121            if (obj.binder)
122                static_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 != (void*)0) close(obj.handle);
139            return;
140        }
141    }
142
143    ALOGE("Invalid object type 0x%08lx", 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 = NULL;
169        } else {
170            obj.type = BINDER_TYPE_BINDER;
171            obj.binder = local->getWeakRefs();
172            obj.cookie = local;
173        }
174    } else {
175        obj.type = BINDER_TYPE_BINDER;
176        obj.binder = NULL;
177        obj.cookie = NULL;
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 = NULL;
202            } else {
203                obj.type = BINDER_TYPE_WEAK_BINDER;
204                obj.binder = binder.get_refs();
205                obj.cookie = 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 = NULL;
220        obj.cookie = NULL;
221        return finish_flatten_binder(NULL, obj, out);
222
223    } else {
224        obj.type = BINDER_TYPE_BINDER;
225        obj.binder = NULL;
226        obj.cookie = NULL;
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, const Parcel& in)
233{
234    return NO_ERROR;
235}
236
237status_t unflatten_binder(const sp<ProcessState>& proc,
238    const Parcel& in, sp<IBinder>* out)
239{
240    const flat_binder_object* flat = in.readObject(false);
241
242    if (flat) {
243        switch (flat->type) {
244            case BINDER_TYPE_BINDER:
245                *out = static_cast<IBinder*>(flat->cookie);
246                return finish_unflatten_binder(NULL, *flat, in);
247            case BINDER_TYPE_HANDLE:
248                *out = proc->getStrongProxyForHandle(flat->handle);
249                return finish_unflatten_binder(
250                    static_cast<BpBinder*>(out->get()), *flat, in);
251        }
252    }
253    return BAD_TYPE;
254}
255
256status_t unflatten_binder(const sp<ProcessState>& proc,
257    const Parcel& in, wp<IBinder>* out)
258{
259    const flat_binder_object* flat = in.readObject(false);
260
261    if (flat) {
262        switch (flat->type) {
263            case BINDER_TYPE_BINDER:
264                *out = static_cast<IBinder*>(flat->cookie);
265                return finish_unflatten_binder(NULL, *flat, in);
266            case BINDER_TYPE_WEAK_BINDER:
267                if (flat->binder != NULL) {
268                    out->set_object_and_refs(
269                        static_cast<IBinder*>(flat->cookie),
270                        static_cast<RefBase::weakref_type*>(flat->binder));
271                } else {
272                    *out = NULL;
273                }
274                return finish_unflatten_binder(NULL, *flat, in);
275            case BINDER_TYPE_HANDLE:
276            case BINDER_TYPE_WEAK_HANDLE:
277                *out = proc->getWeakProxyForHandle(flat->handle);
278                return finish_unflatten_binder(
279                    static_cast<BpBinder*>(out->unsafe_get()), *flat, in);
280        }
281    }
282    return BAD_TYPE;
283}
284
285// ---------------------------------------------------------------------------
286
287Parcel::Parcel()
288{
289    initState();
290}
291
292Parcel::~Parcel()
293{
294    freeDataNoInit();
295}
296
297const uint8_t* Parcel::data() const
298{
299    return mData;
300}
301
302size_t Parcel::dataSize() const
303{
304    return (mDataSize > mDataPos ? mDataSize : mDataPos);
305}
306
307size_t Parcel::dataAvail() const
308{
309    // TODO: decide what to do about the possibility that this can
310    // report an available-data size that exceeds a Java int's max
311    // positive value, causing havoc.  Fortunately this will only
312    // happen if someone constructs a Parcel containing more than two
313    // gigabytes of data, which on typical phone hardware is simply
314    // not possible.
315    return dataSize() - dataPosition();
316}
317
318size_t Parcel::dataPosition() const
319{
320    return mDataPos;
321}
322
323size_t Parcel::dataCapacity() const
324{
325    return mDataCapacity;
326}
327
328status_t Parcel::setDataSize(size_t size)
329{
330    status_t err;
331    err = continueWrite(size);
332    if (err == NO_ERROR) {
333        mDataSize = size;
334        ALOGV("setDataSize Setting data size of %p to %d\n", this, mDataSize);
335    }
336    return err;
337}
338
339void Parcel::setDataPosition(size_t pos) const
340{
341    mDataPos = pos;
342    mNextObjectHint = 0;
343}
344
345status_t Parcel::setDataCapacity(size_t size)
346{
347    if (size > mDataCapacity) return continueWrite(size);
348    return NO_ERROR;
349}
350
351status_t Parcel::setData(const uint8_t* buffer, size_t len)
352{
353    status_t err = restartWrite(len);
354    if (err == NO_ERROR) {
355        memcpy(const_cast<uint8_t*>(data()), buffer, len);
356        mDataSize = len;
357        mFdsKnown = false;
358    }
359    return err;
360}
361
362status_t Parcel::appendFrom(const Parcel *parcel, size_t offset, size_t len)
363{
364    const sp<ProcessState> proc(ProcessState::self());
365    status_t err;
366    const uint8_t *data = parcel->mData;
367    const size_t *objects = parcel->mObjects;
368    size_t size = parcel->mObjectsSize;
369    int startPos = mDataPos;
370    int firstIndex = -1, lastIndex = -2;
371
372    if (len == 0) {
373        return NO_ERROR;
374    }
375
376    // range checks against the source parcel size
377    if ((offset > parcel->mDataSize)
378            || (len > parcel->mDataSize)
379            || (offset + len > parcel->mDataSize)) {
380        return BAD_VALUE;
381    }
382
383    // Count objects in range
384    for (int i = 0; i < (int) size; i++) {
385        size_t off = objects[i];
386        if ((off >= offset) && (off < offset + len)) {
387            if (firstIndex == -1) {
388                firstIndex = i;
389            }
390            lastIndex = i;
391        }
392    }
393    int numObjects = lastIndex - firstIndex + 1;
394
395    if ((mDataSize+len) > mDataCapacity) {
396        // grow data
397        err = growData(len);
398        if (err != NO_ERROR) {
399            return err;
400        }
401    }
402
403    // append data
404    memcpy(mData + mDataPos, data + offset, len);
405    mDataPos += len;
406    mDataSize += len;
407
408    err = NO_ERROR;
409
410    if (numObjects > 0) {
411        // grow objects
412        if (mObjectsCapacity < mObjectsSize + numObjects) {
413            int newSize = ((mObjectsSize + numObjects)*3)/2;
414            size_t *objects =
415                (size_t*)realloc(mObjects, newSize*sizeof(size_t));
416            if (objects == (size_t*)0) {
417                return NO_MEMORY;
418            }
419            mObjects = objects;
420            mObjectsCapacity = newSize;
421        }
422
423        // append and acquire objects
424        int idx = mObjectsSize;
425        for (int i = firstIndex; i <= lastIndex; i++) {
426            size_t off = objects[i] - offset + startPos;
427            mObjects[idx++] = off;
428            mObjectsSize++;
429
430            flat_binder_object* flat
431                = reinterpret_cast<flat_binder_object*>(mData + off);
432            acquire_object(proc, *flat, this);
433
434            if (flat->type == BINDER_TYPE_FD) {
435                // If this is a file descriptor, we need to dup it so the
436                // new Parcel now owns its own fd, and can declare that we
437                // officially know we have fds.
438                flat->handle = dup(flat->handle);
439                flat->cookie = (void*)1;
440                mHasFds = mFdsKnown = true;
441                if (!mAllowFds) {
442                    err = FDS_NOT_ALLOWED;
443                }
444            }
445        }
446    }
447
448    return err;
449}
450
451bool Parcel::pushAllowFds(bool allowFds)
452{
453    const bool origValue = mAllowFds;
454    if (!allowFds) {
455        mAllowFds = false;
456    }
457    return origValue;
458}
459
460void Parcel::restoreAllowFds(bool lastValue)
461{
462    mAllowFds = lastValue;
463}
464
465bool Parcel::hasFileDescriptors() const
466{
467    if (!mFdsKnown) {
468        scanForFds();
469    }
470    return mHasFds;
471}
472
473// Write RPC headers.  (previously just the interface token)
474status_t Parcel::writeInterfaceToken(const String16& interface)
475{
476    writeInt32(IPCThreadState::self()->getStrictModePolicy() |
477               STRICT_MODE_PENALTY_GATHER);
478    // currently the interface identification token is just its name as a string
479    return writeString16(interface);
480}
481
482bool Parcel::checkInterface(IBinder* binder) const
483{
484    return enforceInterface(binder->getInterfaceDescriptor());
485}
486
487bool Parcel::enforceInterface(const String16& interface,
488                              IPCThreadState* threadState) const
489{
490    int32_t strictPolicy = readInt32();
491    if (threadState == NULL) {
492        threadState = IPCThreadState::self();
493    }
494    if ((threadState->getLastTransactionBinderFlags() &
495         IBinder::FLAG_ONEWAY) != 0) {
496      // For one-way calls, the callee is running entirely
497      // disconnected from the caller, so disable StrictMode entirely.
498      // Not only does disk/network usage not impact the caller, but
499      // there's no way to commuicate back any violations anyway.
500      threadState->setStrictModePolicy(0);
501    } else {
502      threadState->setStrictModePolicy(strictPolicy);
503    }
504    const String16 str(readString16());
505    if (str == interface) {
506        return true;
507    } else {
508        ALOGW("**** enforceInterface() expected '%s' but read '%s'\n",
509                String8(interface).string(), String8(str).string());
510        return false;
511    }
512}
513
514const size_t* Parcel::objects() const
515{
516    return mObjects;
517}
518
519size_t Parcel::objectsCount() const
520{
521    return mObjectsSize;
522}
523
524status_t Parcel::errorCheck() const
525{
526    return mError;
527}
528
529void Parcel::setError(status_t err)
530{
531    mError = err;
532}
533
534status_t Parcel::finishWrite(size_t len)
535{
536    //printf("Finish write of %d\n", len);
537    mDataPos += len;
538    ALOGV("finishWrite Setting data pos of %p to %d\n", this, mDataPos);
539    if (mDataPos > mDataSize) {
540        mDataSize = mDataPos;
541        ALOGV("finishWrite Setting data size of %p to %d\n", this, mDataSize);
542    }
543    //printf("New pos=%d, size=%d\n", mDataPos, mDataSize);
544    return NO_ERROR;
545}
546
547status_t Parcel::writeUnpadded(const void* data, size_t len)
548{
549    size_t end = mDataPos + len;
550    if (end < mDataPos) {
551        // integer overflow
552        return BAD_VALUE;
553    }
554
555    if (end <= mDataCapacity) {
556restart_write:
557        memcpy(mData+mDataPos, data, len);
558        return finishWrite(len);
559    }
560
561    status_t err = growData(len);
562    if (err == NO_ERROR) goto restart_write;
563    return err;
564}
565
566status_t Parcel::write(const void* data, size_t len)
567{
568    void* const d = writeInplace(len);
569    if (d) {
570        memcpy(d, data, len);
571        return NO_ERROR;
572    }
573    return mError;
574}
575
576void* Parcel::writeInplace(size_t len)
577{
578    const size_t padded = PAD_SIZE(len);
579
580    // sanity check for integer overflow
581    if (mDataPos+padded < mDataPos) {
582        return NULL;
583    }
584
585    if ((mDataPos+padded) <= mDataCapacity) {
586restart_write:
587        //printf("Writing %ld bytes, padded to %ld\n", len, padded);
588        uint8_t* const data = mData+mDataPos;
589
590        // Need to pad at end?
591        if (padded != len) {
592#if BYTE_ORDER == BIG_ENDIAN
593            static const uint32_t mask[4] = {
594                0x00000000, 0xffffff00, 0xffff0000, 0xff000000
595            };
596#endif
597#if BYTE_ORDER == LITTLE_ENDIAN
598            static const uint32_t mask[4] = {
599                0x00000000, 0x00ffffff, 0x0000ffff, 0x000000ff
600            };
601#endif
602            //printf("Applying pad mask: %p to %p\n", (void*)mask[padded-len],
603            //    *reinterpret_cast<void**>(data+padded-4));
604            *reinterpret_cast<uint32_t*>(data+padded-4) &= mask[padded-len];
605        }
606
607        finishWrite(padded);
608        return data;
609    }
610
611    status_t err = growData(padded);
612    if (err == NO_ERROR) goto restart_write;
613    return NULL;
614}
615
616status_t Parcel::writeInt32(int32_t val)
617{
618    return writeAligned(val);
619}
620
621status_t Parcel::writeInt64(int64_t val)
622{
623    return writeAligned(val);
624}
625
626status_t Parcel::writeFloat(float val)
627{
628    return writeAligned(val);
629}
630
631#if defined(__mips__) && defined(__mips_hard_float)
632
633status_t Parcel::writeDouble(double val)
634{
635    union {
636        double d;
637        unsigned long long ll;
638    } u;
639    u.d = val;
640    return writeAligned(u.ll);
641}
642
643#else
644
645status_t Parcel::writeDouble(double val)
646{
647    return writeAligned(val);
648}
649
650#endif
651
652status_t Parcel::writeIntPtr(intptr_t val)
653{
654    return writeAligned(val);
655}
656
657status_t Parcel::writeCString(const char* str)
658{
659    return write(str, strlen(str)+1);
660}
661
662status_t Parcel::writeString8(const String8& str)
663{
664    status_t err = writeInt32(str.bytes());
665    // only write string if its length is more than zero characters,
666    // as readString8 will only read if the length field is non-zero.
667    // this is slightly different from how writeString16 works.
668    if (str.bytes() > 0 && err == NO_ERROR) {
669        err = write(str.string(), str.bytes()+1);
670    }
671    return err;
672}
673
674status_t Parcel::writeString16(const String16& str)
675{
676    return writeString16(str.string(), str.size());
677}
678
679status_t Parcel::writeString16(const char16_t* str, size_t len)
680{
681    if (str == NULL) return writeInt32(-1);
682
683    status_t err = writeInt32(len);
684    if (err == NO_ERROR) {
685        len *= sizeof(char16_t);
686        uint8_t* data = (uint8_t*)writeInplace(len+sizeof(char16_t));
687        if (data) {
688            memcpy(data, str, len);
689            *reinterpret_cast<char16_t*>(data+len) = 0;
690            return NO_ERROR;
691        }
692        err = mError;
693    }
694    return err;
695}
696
697status_t Parcel::writeStrongBinder(const sp<IBinder>& val)
698{
699    return flatten_binder(ProcessState::self(), val, this);
700}
701
702status_t Parcel::writeWeakBinder(const wp<IBinder>& val)
703{
704    return flatten_binder(ProcessState::self(), val, this);
705}
706
707status_t Parcel::writeNativeHandle(const native_handle* handle)
708{
709    if (!handle || handle->version != sizeof(native_handle))
710        return BAD_TYPE;
711
712    status_t err;
713    err = writeInt32(handle->numFds);
714    if (err != NO_ERROR) return err;
715
716    err = writeInt32(handle->numInts);
717    if (err != NO_ERROR) return err;
718
719    for (int i=0 ; err==NO_ERROR && i<handle->numFds ; i++)
720        err = writeDupFileDescriptor(handle->data[i]);
721
722    if (err != NO_ERROR) {
723        ALOGD("write native handle, write dup fd failed");
724        return err;
725    }
726    err = write(handle->data + handle->numFds, sizeof(int)*handle->numInts);
727    return err;
728}
729
730status_t Parcel::writeFileDescriptor(int fd, bool takeOwnership)
731{
732    flat_binder_object obj;
733    obj.type = BINDER_TYPE_FD;
734    obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS;
735    obj.handle = fd;
736    obj.cookie = (void*) (takeOwnership ? 1 : 0);
737    return writeObject(obj, true);
738}
739
740status_t Parcel::writeDupFileDescriptor(int fd)
741{
742    int dupFd = dup(fd);
743    if (dupFd < 0) {
744        return -errno;
745    }
746    status_t err = writeFileDescriptor(dupFd, true /*takeOwnership*/);
747    if (err) {
748        close(dupFd);
749    }
750    return err;
751}
752
753// WARNING: This method must stay in sync with
754// Parcelable.Creator<ParcelFileDescriptor> CREATOR
755// in frameworks/base/core/java/android/os/ParcelFileDescriptor.java
756status_t Parcel::writeParcelFileDescriptor(int fd, int commChannel) {
757    status_t status;
758
759    if (fd < 0) {
760        status = writeInt32(0); // ParcelFileDescriptor is null
761        if (status) return status;
762    } else {
763        status = writeInt32(1); // ParcelFileDescriptor is not null
764        if (status) return status;
765        status = writeDupFileDescriptor(fd);
766        if (status) return status;
767        if (commChannel < 0) {
768            status = writeInt32(0); // commChannel is null
769            if (status) return status;
770        } else {
771            status = writeInt32(1); // commChannel is not null
772            if (status) return status;
773            status = writeDupFileDescriptor(commChannel);
774        }
775    }
776    return status;
777}
778
779status_t Parcel::writeBlob(size_t len, WritableBlob* outBlob)
780{
781    status_t status;
782
783    if (!mAllowFds || len <= IN_PLACE_BLOB_LIMIT) {
784        ALOGV("writeBlob: write in place");
785        status = writeInt32(0);
786        if (status) return status;
787
788        void* ptr = writeInplace(len);
789        if (!ptr) return NO_MEMORY;
790
791        outBlob->init(false /*mapped*/, ptr, len);
792        return NO_ERROR;
793    }
794
795    ALOGV("writeBlob: write to ashmem");
796    int fd = ashmem_create_region("Parcel Blob", len);
797    if (fd < 0) return NO_MEMORY;
798
799    int result = ashmem_set_prot_region(fd, PROT_READ | PROT_WRITE);
800    if (result < 0) {
801        status = result;
802    } else {
803        void* ptr = ::mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
804        if (ptr == MAP_FAILED) {
805            status = -errno;
806        } else {
807            result = ashmem_set_prot_region(fd, PROT_READ);
808            if (result < 0) {
809                status = result;
810            } else {
811                status = writeInt32(1);
812                if (!status) {
813                    status = writeFileDescriptor(fd, true /*takeOwnership*/);
814                    if (!status) {
815                        outBlob->init(true /*mapped*/, ptr, len);
816                        return NO_ERROR;
817                    }
818                }
819            }
820        }
821        ::munmap(ptr, len);
822    }
823    ::close(fd);
824    return status;
825}
826
827status_t Parcel::write(const FlattenableHelperInterface& val)
828{
829    status_t err;
830
831    // size if needed
832    const size_t len = val.getFlattenedSize();
833    const size_t fd_count = val.getFdCount();
834
835    err = this->writeInt32(len);
836    if (err) return err;
837
838    err = this->writeInt32(fd_count);
839    if (err) return err;
840
841    // payload
842    void* const buf = this->writeInplace(PAD_SIZE(len));
843    if (buf == NULL)
844        return BAD_VALUE;
845
846    int* fds = NULL;
847    if (fd_count) {
848        fds = new int[fd_count];
849    }
850
851    err = val.flatten(buf, len, fds, fd_count);
852    for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) {
853        err = this->writeDupFileDescriptor( fds[i] );
854    }
855
856    if (fd_count) {
857        delete [] fds;
858    }
859
860    return err;
861}
862
863status_t Parcel::writeObject(const flat_binder_object& val, bool nullMetaData)
864{
865    const bool enoughData = (mDataPos+sizeof(val)) <= mDataCapacity;
866    const bool enoughObjects = mObjectsSize < mObjectsCapacity;
867    if (enoughData && enoughObjects) {
868restart_write:
869        *reinterpret_cast<flat_binder_object*>(mData+mDataPos) = val;
870
871        // Need to write meta-data?
872        if (nullMetaData || val.binder != NULL) {
873            mObjects[mObjectsSize] = mDataPos;
874            acquire_object(ProcessState::self(), val, this);
875            mObjectsSize++;
876        }
877
878        // remember if it's a file descriptor
879        if (val.type == BINDER_TYPE_FD) {
880            if (!mAllowFds) {
881                return FDS_NOT_ALLOWED;
882            }
883            mHasFds = mFdsKnown = true;
884        }
885
886        return finishWrite(sizeof(flat_binder_object));
887    }
888
889    if (!enoughData) {
890        const status_t err = growData(sizeof(val));
891        if (err != NO_ERROR) return err;
892    }
893    if (!enoughObjects) {
894        size_t newSize = ((mObjectsSize+2)*3)/2;
895        size_t* objects = (size_t*)realloc(mObjects, newSize*sizeof(size_t));
896        if (objects == NULL) return NO_MEMORY;
897        mObjects = objects;
898        mObjectsCapacity = newSize;
899    }
900
901    goto restart_write;
902}
903
904status_t Parcel::writeNoException()
905{
906    return writeInt32(0);
907}
908
909void Parcel::remove(size_t start, size_t amt)
910{
911    LOG_ALWAYS_FATAL("Parcel::remove() not yet implemented!");
912}
913
914status_t Parcel::read(void* outData, size_t len) const
915{
916    if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize) {
917        memcpy(outData, mData+mDataPos, len);
918        mDataPos += PAD_SIZE(len);
919        ALOGV("read Setting data pos of %p to %d\n", this, mDataPos);
920        return NO_ERROR;
921    }
922    return NOT_ENOUGH_DATA;
923}
924
925const void* Parcel::readInplace(size_t len) const
926{
927    if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize) {
928        const void* data = mData+mDataPos;
929        mDataPos += PAD_SIZE(len);
930        ALOGV("readInplace Setting data pos of %p to %d\n", this, mDataPos);
931        return data;
932    }
933    return NULL;
934}
935
936template<class T>
937status_t Parcel::readAligned(T *pArg) const {
938    COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE(sizeof(T)) == sizeof(T));
939
940    if ((mDataPos+sizeof(T)) <= mDataSize) {
941        const void* data = mData+mDataPos;
942        mDataPos += sizeof(T);
943        *pArg =  *reinterpret_cast<const T*>(data);
944        return NO_ERROR;
945    } else {
946        return NOT_ENOUGH_DATA;
947    }
948}
949
950template<class T>
951T Parcel::readAligned() const {
952    T result;
953    if (readAligned(&result) != NO_ERROR) {
954        result = 0;
955    }
956
957    return result;
958}
959
960template<class T>
961status_t Parcel::writeAligned(T val) {
962    COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE(sizeof(T)) == sizeof(T));
963
964    if ((mDataPos+sizeof(val)) <= mDataCapacity) {
965restart_write:
966        *reinterpret_cast<T*>(mData+mDataPos) = val;
967        return finishWrite(sizeof(val));
968    }
969
970    status_t err = growData(sizeof(val));
971    if (err == NO_ERROR) goto restart_write;
972    return err;
973}
974
975status_t Parcel::readInt32(int32_t *pArg) const
976{
977    return readAligned(pArg);
978}
979
980int32_t Parcel::readInt32() const
981{
982    return readAligned<int32_t>();
983}
984
985
986status_t Parcel::readInt64(int64_t *pArg) const
987{
988    return readAligned(pArg);
989}
990
991
992int64_t Parcel::readInt64() const
993{
994    return readAligned<int64_t>();
995}
996
997status_t Parcel::readFloat(float *pArg) const
998{
999    return readAligned(pArg);
1000}
1001
1002
1003float Parcel::readFloat() const
1004{
1005    return readAligned<float>();
1006}
1007
1008#if defined(__mips__) && defined(__mips_hard_float)
1009
1010status_t Parcel::readDouble(double *pArg) const
1011{
1012    union {
1013      double d;
1014      unsigned long long ll;
1015    } u;
1016    status_t status;
1017    status = readAligned(&u.ll);
1018    *pArg = u.d;
1019    return status;
1020}
1021
1022double Parcel::readDouble() const
1023{
1024    union {
1025      double d;
1026      unsigned long long ll;
1027    } u;
1028    u.ll = readAligned<unsigned long long>();
1029    return u.d;
1030}
1031
1032#else
1033
1034status_t Parcel::readDouble(double *pArg) const
1035{
1036    return readAligned(pArg);
1037}
1038
1039double Parcel::readDouble() const
1040{
1041    return readAligned<double>();
1042}
1043
1044#endif
1045
1046status_t Parcel::readIntPtr(intptr_t *pArg) const
1047{
1048    return readAligned(pArg);
1049}
1050
1051
1052intptr_t Parcel::readIntPtr() const
1053{
1054    return readAligned<intptr_t>();
1055}
1056
1057
1058const char* Parcel::readCString() const
1059{
1060    const size_t avail = mDataSize-mDataPos;
1061    if (avail > 0) {
1062        const char* str = reinterpret_cast<const char*>(mData+mDataPos);
1063        // is the string's trailing NUL within the parcel's valid bounds?
1064        const char* eos = reinterpret_cast<const char*>(memchr(str, 0, avail));
1065        if (eos) {
1066            const size_t len = eos - str;
1067            mDataPos += PAD_SIZE(len+1);
1068            ALOGV("readCString Setting data pos of %p to %d\n", this, mDataPos);
1069            return str;
1070        }
1071    }
1072    return NULL;
1073}
1074
1075String8 Parcel::readString8() const
1076{
1077    int32_t size = readInt32();
1078    // watch for potential int overflow adding 1 for trailing NUL
1079    if (size > 0 && size < INT32_MAX) {
1080        const char* str = (const char*)readInplace(size+1);
1081        if (str) return String8(str, size);
1082    }
1083    return String8();
1084}
1085
1086String16 Parcel::readString16() const
1087{
1088    size_t len;
1089    const char16_t* str = readString16Inplace(&len);
1090    if (str) return String16(str, len);
1091    ALOGE("Reading a NULL string not supported here.");
1092    return String16();
1093}
1094
1095const char16_t* Parcel::readString16Inplace(size_t* outLen) const
1096{
1097    int32_t size = readInt32();
1098    // watch for potential int overflow from size+1
1099    if (size >= 0 && size < INT32_MAX) {
1100        *outLen = size;
1101        const char16_t* str = (const char16_t*)readInplace((size+1)*sizeof(char16_t));
1102        if (str != NULL) {
1103            return str;
1104        }
1105    }
1106    *outLen = 0;
1107    return NULL;
1108}
1109
1110sp<IBinder> Parcel::readStrongBinder() const
1111{
1112    sp<IBinder> val;
1113    unflatten_binder(ProcessState::self(), *this, &val);
1114    return val;
1115}
1116
1117wp<IBinder> Parcel::readWeakBinder() const
1118{
1119    wp<IBinder> val;
1120    unflatten_binder(ProcessState::self(), *this, &val);
1121    return val;
1122}
1123
1124int32_t Parcel::readExceptionCode() const
1125{
1126  int32_t exception_code = readAligned<int32_t>();
1127  if (exception_code == EX_HAS_REPLY_HEADER) {
1128    int32_t header_start = dataPosition();
1129    int32_t header_size = readAligned<int32_t>();
1130    // Skip over fat responses headers.  Not used (or propagated) in
1131    // native code
1132    setDataPosition(header_start + header_size);
1133    // And fat response headers are currently only used when there are no
1134    // exceptions, so return no error:
1135    return 0;
1136  }
1137  return exception_code;
1138}
1139
1140native_handle* Parcel::readNativeHandle() const
1141{
1142    int numFds, numInts;
1143    status_t err;
1144    err = readInt32(&numFds);
1145    if (err != NO_ERROR) return 0;
1146    err = readInt32(&numInts);
1147    if (err != NO_ERROR) return 0;
1148
1149    native_handle* h = native_handle_create(numFds, numInts);
1150    for (int i=0 ; err==NO_ERROR && i<numFds ; i++) {
1151        h->data[i] = dup(readFileDescriptor());
1152        if (h->data[i] < 0) err = BAD_VALUE;
1153    }
1154    err = read(h->data + numFds, sizeof(int)*numInts);
1155    if (err != NO_ERROR) {
1156        native_handle_close(h);
1157        native_handle_delete(h);
1158        h = 0;
1159    }
1160    return h;
1161}
1162
1163
1164int Parcel::readFileDescriptor() const
1165{
1166    const flat_binder_object* flat = readObject(true);
1167    if (flat) {
1168        switch (flat->type) {
1169            case BINDER_TYPE_FD:
1170                //ALOGI("Returning file descriptor %ld from parcel %p\n", flat->handle, this);
1171                return flat->handle;
1172        }
1173    }
1174    return BAD_TYPE;
1175}
1176
1177// WARNING: This method must stay in sync with writeToParcel()
1178// in frameworks/base/core/java/android/os/ParcelFileDescriptor.java
1179int Parcel::readParcelFileDescriptor(int& outCommChannel) const {
1180    int fd;
1181    outCommChannel = -1;
1182
1183    if (readInt32() == 0) {
1184        fd = -1;
1185    } else {
1186        fd = readFileDescriptor();
1187        if (fd >= 0 && readInt32() != 0) {
1188            outCommChannel = readFileDescriptor();
1189        }
1190    }
1191    return fd;
1192}
1193
1194status_t Parcel::readBlob(size_t len, ReadableBlob* outBlob) const
1195{
1196    int32_t useAshmem;
1197    status_t status = readInt32(&useAshmem);
1198    if (status) return status;
1199
1200    if (!useAshmem) {
1201        ALOGV("readBlob: read in place");
1202        const void* ptr = readInplace(len);
1203        if (!ptr) return BAD_VALUE;
1204
1205        outBlob->init(false /*mapped*/, const_cast<void*>(ptr), len);
1206        return NO_ERROR;
1207    }
1208
1209    ALOGV("readBlob: read from ashmem");
1210    int fd = readFileDescriptor();
1211    if (fd == int(BAD_TYPE)) return BAD_VALUE;
1212
1213    void* ptr = ::mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0);
1214    if (!ptr) return NO_MEMORY;
1215
1216    outBlob->init(true /*mapped*/, ptr, len);
1217    return NO_ERROR;
1218}
1219
1220status_t Parcel::read(FlattenableHelperInterface& val) const
1221{
1222    // size
1223    const size_t len = this->readInt32();
1224    const size_t fd_count = this->readInt32();
1225
1226    // payload
1227    void const* const buf = this->readInplace(PAD_SIZE(len));
1228    if (buf == NULL)
1229        return BAD_VALUE;
1230
1231    int* fds = NULL;
1232    if (fd_count) {
1233        fds = new int[fd_count];
1234    }
1235
1236    status_t err = NO_ERROR;
1237    for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) {
1238        fds[i] = dup(this->readFileDescriptor());
1239        if (fds[i] < 0) err = BAD_VALUE;
1240    }
1241
1242    if (err == NO_ERROR) {
1243        err = val.unflatten(buf, len, fds, fd_count);
1244    }
1245
1246    if (fd_count) {
1247        delete [] fds;
1248    }
1249
1250    return err;
1251}
1252const flat_binder_object* Parcel::readObject(bool nullMetaData) const
1253{
1254    const size_t DPOS = mDataPos;
1255    if ((DPOS+sizeof(flat_binder_object)) <= mDataSize) {
1256        const flat_binder_object* obj
1257                = reinterpret_cast<const flat_binder_object*>(mData+DPOS);
1258        mDataPos = DPOS + sizeof(flat_binder_object);
1259        if (!nullMetaData && (obj->cookie == NULL && obj->binder == NULL)) {
1260            // When transferring a NULL object, we don't write it into
1261            // the object list, so we don't want to check for it when
1262            // reading.
1263            ALOGV("readObject Setting data pos of %p to %d\n", this, mDataPos);
1264            return obj;
1265        }
1266
1267        // Ensure that this object is valid...
1268        size_t* const OBJS = mObjects;
1269        const size_t N = mObjectsSize;
1270        size_t opos = mNextObjectHint;
1271
1272        if (N > 0) {
1273            ALOGV("Parcel %p looking for obj at %d, hint=%d\n",
1274                 this, DPOS, opos);
1275
1276            // Start at the current hint position, looking for an object at
1277            // the current data position.
1278            if (opos < N) {
1279                while (opos < (N-1) && OBJS[opos] < DPOS) {
1280                    opos++;
1281                }
1282            } else {
1283                opos = N-1;
1284            }
1285            if (OBJS[opos] == DPOS) {
1286                // Found it!
1287                ALOGV("Parcel found obj %d at index %d with forward search",
1288                     this, DPOS, opos);
1289                mNextObjectHint = opos+1;
1290                ALOGV("readObject Setting data pos of %p to %d\n", this, mDataPos);
1291                return obj;
1292            }
1293
1294            // Look backwards for it...
1295            while (opos > 0 && OBJS[opos] > DPOS) {
1296                opos--;
1297            }
1298            if (OBJS[opos] == DPOS) {
1299                // Found it!
1300                ALOGV("Parcel found obj %d at index %d with backward search",
1301                     this, DPOS, opos);
1302                mNextObjectHint = opos+1;
1303                ALOGV("readObject Setting data pos of %p to %d\n", this, mDataPos);
1304                return obj;
1305            }
1306        }
1307        ALOGW("Attempt to read object from Parcel %p at offset %d that is not in the object list",
1308             this, DPOS);
1309    }
1310    return NULL;
1311}
1312
1313void Parcel::closeFileDescriptors()
1314{
1315    size_t i = mObjectsSize;
1316    if (i > 0) {
1317        //ALOGI("Closing file descriptors for %d objects...", mObjectsSize);
1318    }
1319    while (i > 0) {
1320        i--;
1321        const flat_binder_object* flat
1322            = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]);
1323        if (flat->type == BINDER_TYPE_FD) {
1324            //ALOGI("Closing fd: %ld\n", flat->handle);
1325            close(flat->handle);
1326        }
1327    }
1328}
1329
1330const uint8_t* Parcel::ipcData() const
1331{
1332    return mData;
1333}
1334
1335size_t Parcel::ipcDataSize() const
1336{
1337    return (mDataSize > mDataPos ? mDataSize : mDataPos);
1338}
1339
1340const size_t* Parcel::ipcObjects() const
1341{
1342    return mObjects;
1343}
1344
1345size_t Parcel::ipcObjectsCount() const
1346{
1347    return mObjectsSize;
1348}
1349
1350void Parcel::ipcSetDataReference(const uint8_t* data, size_t dataSize,
1351    const size_t* objects, size_t objectsCount, release_func relFunc, void* relCookie)
1352{
1353    freeDataNoInit();
1354    mError = NO_ERROR;
1355    mData = const_cast<uint8_t*>(data);
1356    mDataSize = mDataCapacity = dataSize;
1357    //ALOGI("setDataReference Setting data size of %p to %lu (pid=%d)\n", this, mDataSize, getpid());
1358    mDataPos = 0;
1359    ALOGV("setDataReference Setting data pos of %p to %d\n", this, mDataPos);
1360    mObjects = const_cast<size_t*>(objects);
1361    mObjectsSize = mObjectsCapacity = objectsCount;
1362    mNextObjectHint = 0;
1363    mOwner = relFunc;
1364    mOwnerCookie = relCookie;
1365    scanForFds();
1366}
1367
1368void Parcel::print(TextOutput& to, uint32_t flags) const
1369{
1370    to << "Parcel(";
1371
1372    if (errorCheck() != NO_ERROR) {
1373        const status_t err = errorCheck();
1374        to << "Error: " << (void*)err << " \"" << strerror(-err) << "\"";
1375    } else if (dataSize() > 0) {
1376        const uint8_t* DATA = data();
1377        to << indent << HexDump(DATA, dataSize()) << dedent;
1378        const size_t* OBJS = objects();
1379        const size_t N = objectsCount();
1380        for (size_t i=0; i<N; i++) {
1381            const flat_binder_object* flat
1382                = reinterpret_cast<const flat_binder_object*>(DATA+OBJS[i]);
1383            to << endl << "Object #" << i << " @ " << (void*)OBJS[i] << ": "
1384                << TypeCode(flat->type & 0x7f7f7f00)
1385                << " = " << flat->binder;
1386        }
1387    } else {
1388        to << "NULL";
1389    }
1390
1391    to << ")";
1392}
1393
1394void Parcel::releaseObjects()
1395{
1396    const sp<ProcessState> proc(ProcessState::self());
1397    size_t i = mObjectsSize;
1398    uint8_t* const data = mData;
1399    size_t* const objects = mObjects;
1400    while (i > 0) {
1401        i--;
1402        const flat_binder_object* flat
1403            = reinterpret_cast<flat_binder_object*>(data+objects[i]);
1404        release_object(proc, *flat, this);
1405    }
1406}
1407
1408void Parcel::acquireObjects()
1409{
1410    const sp<ProcessState> proc(ProcessState::self());
1411    size_t i = mObjectsSize;
1412    uint8_t* const data = mData;
1413    size_t* const objects = mObjects;
1414    while (i > 0) {
1415        i--;
1416        const flat_binder_object* flat
1417            = reinterpret_cast<flat_binder_object*>(data+objects[i]);
1418        acquire_object(proc, *flat, this);
1419    }
1420}
1421
1422void Parcel::freeData()
1423{
1424    freeDataNoInit();
1425    initState();
1426}
1427
1428void Parcel::freeDataNoInit()
1429{
1430    if (mOwner) {
1431        //ALOGI("Freeing data ref of %p (pid=%d)\n", this, getpid());
1432        mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie);
1433    } else {
1434        releaseObjects();
1435        if (mData) free(mData);
1436        if (mObjects) free(mObjects);
1437    }
1438}
1439
1440status_t Parcel::growData(size_t len)
1441{
1442    size_t newSize = ((mDataSize+len)*3)/2;
1443    return (newSize <= mDataSize)
1444            ? (status_t) NO_MEMORY
1445            : continueWrite(newSize);
1446}
1447
1448status_t Parcel::restartWrite(size_t desired)
1449{
1450    if (mOwner) {
1451        freeData();
1452        return continueWrite(desired);
1453    }
1454
1455    uint8_t* data = (uint8_t*)realloc(mData, desired);
1456    if (!data && desired > mDataCapacity) {
1457        mError = NO_MEMORY;
1458        return NO_MEMORY;
1459    }
1460
1461    releaseObjects();
1462
1463    if (data) {
1464        mData = data;
1465        mDataCapacity = desired;
1466    }
1467
1468    mDataSize = mDataPos = 0;
1469    ALOGV("restartWrite Setting data size of %p to %d\n", this, mDataSize);
1470    ALOGV("restartWrite Setting data pos of %p to %d\n", this, mDataPos);
1471
1472    free(mObjects);
1473    mObjects = NULL;
1474    mObjectsSize = mObjectsCapacity = 0;
1475    mNextObjectHint = 0;
1476    mHasFds = false;
1477    mFdsKnown = true;
1478    mAllowFds = true;
1479
1480    return NO_ERROR;
1481}
1482
1483status_t Parcel::continueWrite(size_t desired)
1484{
1485    // If shrinking, first adjust for any objects that appear
1486    // after the new data size.
1487    size_t objectsSize = mObjectsSize;
1488    if (desired < mDataSize) {
1489        if (desired == 0) {
1490            objectsSize = 0;
1491        } else {
1492            while (objectsSize > 0) {
1493                if (mObjects[objectsSize-1] < desired)
1494                    break;
1495                objectsSize--;
1496            }
1497        }
1498    }
1499
1500    if (mOwner) {
1501        // If the size is going to zero, just release the owner's data.
1502        if (desired == 0) {
1503            freeData();
1504            return NO_ERROR;
1505        }
1506
1507        // If there is a different owner, we need to take
1508        // posession.
1509        uint8_t* data = (uint8_t*)malloc(desired);
1510        if (!data) {
1511            mError = NO_MEMORY;
1512            return NO_MEMORY;
1513        }
1514        size_t* objects = NULL;
1515
1516        if (objectsSize) {
1517            objects = (size_t*)malloc(objectsSize*sizeof(size_t));
1518            if (!objects) {
1519                free(data);
1520
1521                mError = NO_MEMORY;
1522                return NO_MEMORY;
1523            }
1524
1525            // Little hack to only acquire references on objects
1526            // we will be keeping.
1527            size_t oldObjectsSize = mObjectsSize;
1528            mObjectsSize = objectsSize;
1529            acquireObjects();
1530            mObjectsSize = oldObjectsSize;
1531        }
1532
1533        if (mData) {
1534            memcpy(data, mData, mDataSize < desired ? mDataSize : desired);
1535        }
1536        if (objects && mObjects) {
1537            memcpy(objects, mObjects, objectsSize*sizeof(size_t));
1538        }
1539        //ALOGI("Freeing data ref of %p (pid=%d)\n", this, getpid());
1540        mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie);
1541        mOwner = NULL;
1542
1543        mData = data;
1544        mObjects = objects;
1545        mDataSize = (mDataSize < desired) ? mDataSize : desired;
1546        ALOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize);
1547        mDataCapacity = desired;
1548        mObjectsSize = mObjectsCapacity = objectsSize;
1549        mNextObjectHint = 0;
1550
1551    } else if (mData) {
1552        if (objectsSize < mObjectsSize) {
1553            // Need to release refs on any objects we are dropping.
1554            const sp<ProcessState> proc(ProcessState::self());
1555            for (size_t i=objectsSize; i<mObjectsSize; i++) {
1556                const flat_binder_object* flat
1557                    = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]);
1558                if (flat->type == BINDER_TYPE_FD) {
1559                    // will need to rescan because we may have lopped off the only FDs
1560                    mFdsKnown = false;
1561                }
1562                release_object(proc, *flat, this);
1563            }
1564            size_t* objects =
1565                (size_t*)realloc(mObjects, objectsSize*sizeof(size_t));
1566            if (objects) {
1567                mObjects = objects;
1568            }
1569            mObjectsSize = objectsSize;
1570            mNextObjectHint = 0;
1571        }
1572
1573        // We own the data, so we can just do a realloc().
1574        if (desired > mDataCapacity) {
1575            uint8_t* data = (uint8_t*)realloc(mData, desired);
1576            if (data) {
1577                mData = data;
1578                mDataCapacity = desired;
1579            } else if (desired > mDataCapacity) {
1580                mError = NO_MEMORY;
1581                return NO_MEMORY;
1582            }
1583        } else {
1584            if (mDataSize > desired) {
1585                mDataSize = desired;
1586                ALOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize);
1587            }
1588            if (mDataPos > desired) {
1589                mDataPos = desired;
1590                ALOGV("continueWrite Setting data pos of %p to %d\n", this, mDataPos);
1591            }
1592        }
1593
1594    } else {
1595        // This is the first data.  Easy!
1596        uint8_t* data = (uint8_t*)malloc(desired);
1597        if (!data) {
1598            mError = NO_MEMORY;
1599            return NO_MEMORY;
1600        }
1601
1602        if(!(mDataCapacity == 0 && mObjects == NULL
1603             && mObjectsCapacity == 0)) {
1604            ALOGE("continueWrite: %d/%p/%d/%d", mDataCapacity, mObjects, mObjectsCapacity, desired);
1605        }
1606
1607        mData = data;
1608        mDataSize = mDataPos = 0;
1609        ALOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize);
1610        ALOGV("continueWrite Setting data pos of %p to %d\n", this, mDataPos);
1611        mDataCapacity = desired;
1612    }
1613
1614    return NO_ERROR;
1615}
1616
1617void Parcel::initState()
1618{
1619    mError = NO_ERROR;
1620    mData = 0;
1621    mDataSize = 0;
1622    mDataCapacity = 0;
1623    mDataPos = 0;
1624    ALOGV("initState Setting data size of %p to %d\n", this, mDataSize);
1625    ALOGV("initState Setting data pos of %p to %d\n", this, mDataPos);
1626    mObjects = NULL;
1627    mObjectsSize = 0;
1628    mObjectsCapacity = 0;
1629    mNextObjectHint = 0;
1630    mHasFds = false;
1631    mFdsKnown = true;
1632    mAllowFds = true;
1633    mOwner = NULL;
1634}
1635
1636void Parcel::scanForFds() const
1637{
1638    bool hasFds = false;
1639    for (size_t i=0; i<mObjectsSize; i++) {
1640        const flat_binder_object* flat
1641            = reinterpret_cast<const flat_binder_object*>(mData + mObjects[i]);
1642        if (flat->type == BINDER_TYPE_FD) {
1643            hasFds = true;
1644            break;
1645        }
1646    }
1647    mHasFds = hasFds;
1648    mFdsKnown = true;
1649}
1650
1651// --- Parcel::Blob ---
1652
1653Parcel::Blob::Blob() :
1654        mMapped(false), mData(NULL), mSize(0) {
1655}
1656
1657Parcel::Blob::~Blob() {
1658    release();
1659}
1660
1661void Parcel::Blob::release() {
1662    if (mMapped && mData) {
1663        ::munmap(mData, mSize);
1664    }
1665    clear();
1666}
1667
1668void Parcel::Blob::init(bool mapped, void* data, size_t size) {
1669    mMapped = mapped;
1670    mData = data;
1671    mSize = size;
1672}
1673
1674void Parcel::Blob::clear() {
1675    mMapped = false;
1676    mData = NULL;
1677    mSize = 0;
1678}
1679
1680}; // namespace android
1681