Parcel.cpp revision 208059f67ed2dd9fa025e07fcb6954d3cb61c79e 
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 <utils/Parcel.h>
21
22#include <utils/Binder.h>
23#include <utils/BpBinder.h>
24#include <utils/Debug.h>
25#include <utils/ProcessState.h>
26#include <utils/Log.h>
27#include <utils/String8.h>
28#include <utils/String16.h>
29#include <utils/TextOutput.h>
30#include <utils/misc.h>
31
32#include <private/binder/binder_module.h>
33
34#include <stdio.h>
35#include <stdlib.h>
36#include <stdint.h>
37
38#ifndef INT32_MAX
39#define INT32_MAX ((int32_t)(2147483647))
40#endif
41
42#define LOG_REFS(...)
43//#define LOG_REFS(...) LOG(LOG_DEBUG, "Parcel", __VA_ARGS__)
44
45// ---------------------------------------------------------------------------
46
47#define PAD_SIZE(s) (((s)+3)&~3)
48
49// XXX This can be made public if we want to provide
50// support for typed data.
51struct small_flat_data
52{
53    uint32_t type;
54    uint32_t data;
55};
56
57namespace android {
58
59void acquire_object(const sp<ProcessState>& proc,
60    const flat_binder_object& obj, const void* who)
61{
62    switch (obj.type) {
63        case BINDER_TYPE_BINDER:
64            if (obj.binder) {
65                LOG_REFS("Parcel %p acquiring reference on local %p", who, obj.cookie);
66                static_cast<IBinder*>(obj.cookie)->incStrong(who);
67            }
68            return;
69        case BINDER_TYPE_WEAK_BINDER:
70            if (obj.binder)
71                static_cast<RefBase::weakref_type*>(obj.binder)->incWeak(who);
72            return;
73        case BINDER_TYPE_HANDLE: {
74            const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle);
75            if (b != NULL) {
76                LOG_REFS("Parcel %p acquiring reference on remote %p", who, b.get());
77                b->incStrong(who);
78            }
79            return;
80        }
81        case BINDER_TYPE_WEAK_HANDLE: {
82            const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle);
83            if (b != NULL) b.get_refs()->incWeak(who);
84            return;
85        }
86        case BINDER_TYPE_FD: {
87            // intentionally blank -- nothing to do to acquire this, but we do
88            // recognize it as a legitimate object type.
89            return;
90        }
91    }
92
93    LOGD("Invalid object type 0x%08lx", obj.type);
94}
95
96void release_object(const sp<ProcessState>& proc,
97    const flat_binder_object& obj, const void* who)
98{
99    switch (obj.type) {
100        case BINDER_TYPE_BINDER:
101            if (obj.binder) {
102                LOG_REFS("Parcel %p releasing reference on local %p", who, obj.cookie);
103                static_cast<IBinder*>(obj.cookie)->decStrong(who);
104            }
105            return;
106        case BINDER_TYPE_WEAK_BINDER:
107            if (obj.binder)
108                static_cast<RefBase::weakref_type*>(obj.binder)->decWeak(who);
109            return;
110        case BINDER_TYPE_HANDLE: {
111            const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle);
112            if (b != NULL) {
113                LOG_REFS("Parcel %p releasing reference on remote %p", who, b.get());
114                b->decStrong(who);
115            }
116            return;
117        }
118        case BINDER_TYPE_WEAK_HANDLE: {
119            const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle);
120            if (b != NULL) b.get_refs()->decWeak(who);
121            return;
122        }
123        case BINDER_TYPE_FD: {
124            if (obj.cookie != (void*)0) close(obj.handle);
125            return;
126        }
127    }
128
129    LOGE("Invalid object type 0x%08lx", obj.type);
130}
131
132inline static status_t finish_flatten_binder(
133    const sp<IBinder>& binder, const flat_binder_object& flat, Parcel* out)
134{
135    return out->writeObject(flat, false);
136}
137
138status_t flatten_binder(const sp<ProcessState>& proc,
139    const sp<IBinder>& binder, Parcel* out)
140{
141    flat_binder_object obj;
142
143    obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS;
144    if (binder != NULL) {
145        IBinder *local = binder->localBinder();
146        if (!local) {
147            BpBinder *proxy = binder->remoteBinder();
148            if (proxy == NULL) {
149                LOGE("null proxy");
150            }
151            const int32_t handle = proxy ? proxy->handle() : 0;
152            obj.type = BINDER_TYPE_HANDLE;
153            obj.handle = handle;
154            obj.cookie = NULL;
155        } else {
156            obj.type = BINDER_TYPE_BINDER;
157            obj.binder = local->getWeakRefs();
158            obj.cookie = local;
159        }
160    } else {
161        obj.type = BINDER_TYPE_BINDER;
162        obj.binder = NULL;
163        obj.cookie = NULL;
164    }
165
166    return finish_flatten_binder(binder, obj, out);
167}
168
169status_t flatten_binder(const sp<ProcessState>& proc,
170    const wp<IBinder>& binder, Parcel* out)
171{
172    flat_binder_object obj;
173
174    obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS;
175    if (binder != NULL) {
176        sp<IBinder> real = binder.promote();
177        if (real != NULL) {
178            IBinder *local = real->localBinder();
179            if (!local) {
180                BpBinder *proxy = real->remoteBinder();
181                if (proxy == NULL) {
182                    LOGE("null proxy");
183                }
184                const int32_t handle = proxy ? proxy->handle() : 0;
185                obj.type = BINDER_TYPE_WEAK_HANDLE;
186                obj.handle = handle;
187                obj.cookie = NULL;
188            } else {
189                obj.type = BINDER_TYPE_WEAK_BINDER;
190                obj.binder = binder.get_refs();
191                obj.cookie = binder.unsafe_get();
192            }
193            return finish_flatten_binder(real, obj, out);
194        }
195
196        // XXX How to deal?  In order to flatten the given binder,
197        // we need to probe it for information, which requires a primary
198        // reference...  but we don't have one.
199        //
200        // The OpenBinder implementation uses a dynamic_cast<> here,
201        // but we can't do that with the different reference counting
202        // implementation we are using.
203        LOGE("Unable to unflatten Binder weak reference!");
204        obj.type = BINDER_TYPE_BINDER;
205        obj.binder = NULL;
206        obj.cookie = NULL;
207        return finish_flatten_binder(NULL, obj, out);
208
209    } else {
210        obj.type = BINDER_TYPE_BINDER;
211        obj.binder = NULL;
212        obj.cookie = NULL;
213        return finish_flatten_binder(NULL, obj, out);
214    }
215}
216
217inline static status_t finish_unflatten_binder(
218    BpBinder* proxy, const flat_binder_object& flat, const Parcel& in)
219{
220    return NO_ERROR;
221}
222
223status_t unflatten_binder(const sp<ProcessState>& proc,
224    const Parcel& in, sp<IBinder>* out)
225{
226    const flat_binder_object* flat = in.readObject(false);
227
228    if (flat) {
229        switch (flat->type) {
230            case BINDER_TYPE_BINDER:
231                *out = static_cast<IBinder*>(flat->cookie);
232                return finish_unflatten_binder(NULL, *flat, in);
233            case BINDER_TYPE_HANDLE:
234                *out = proc->getStrongProxyForHandle(flat->handle);
235                return finish_unflatten_binder(
236                    static_cast<BpBinder*>(out->get()), *flat, in);
237        }
238    }
239    return BAD_TYPE;
240}
241
242status_t unflatten_binder(const sp<ProcessState>& proc,
243    const Parcel& in, wp<IBinder>* out)
244{
245    const flat_binder_object* flat = in.readObject(false);
246
247    if (flat) {
248        switch (flat->type) {
249            case BINDER_TYPE_BINDER:
250                *out = static_cast<IBinder*>(flat->cookie);
251                return finish_unflatten_binder(NULL, *flat, in);
252            case BINDER_TYPE_WEAK_BINDER:
253                if (flat->binder != NULL) {
254                    out->set_object_and_refs(
255                        static_cast<IBinder*>(flat->cookie),
256                        static_cast<RefBase::weakref_type*>(flat->binder));
257                } else {
258                    *out = NULL;
259                }
260                return finish_unflatten_binder(NULL, *flat, in);
261            case BINDER_TYPE_HANDLE:
262            case BINDER_TYPE_WEAK_HANDLE:
263                *out = proc->getWeakProxyForHandle(flat->handle);
264                return finish_unflatten_binder(
265                    static_cast<BpBinder*>(out->unsafe_get()), *flat, in);
266        }
267    }
268    return BAD_TYPE;
269}
270
271// ---------------------------------------------------------------------------
272
273Parcel::Parcel()
274{
275    initState();
276}
277
278Parcel::~Parcel()
279{
280    freeDataNoInit();
281}
282
283const uint8_t* Parcel::data() const
284{
285    return mData;
286}
287
288size_t Parcel::dataSize() const
289{
290    return (mDataSize > mDataPos ? mDataSize : mDataPos);
291}
292
293size_t Parcel::dataAvail() const
294{
295    // TODO: decide what to do about the possibility that this can
296    // report an available-data size that exceeds a Java int's max
297    // positive value, causing havoc.  Fortunately this will only
298    // happen if someone constructs a Parcel containing more than two
299    // gigabytes of data, which on typical phone hardware is simply
300    // not possible.
301    return dataSize() - dataPosition();
302}
303
304size_t Parcel::dataPosition() const
305{
306    return mDataPos;
307}
308
309size_t Parcel::dataCapacity() const
310{
311    return mDataCapacity;
312}
313
314status_t Parcel::setDataSize(size_t size)
315{
316    status_t err;
317    err = continueWrite(size);
318    if (err == NO_ERROR) {
319        mDataSize = size;
320        LOGV("setDataSize Setting data size of %p to %d\n", this, mDataSize);
321    }
322    return err;
323}
324
325void Parcel::setDataPosition(size_t pos) const
326{
327    mDataPos = pos;
328    mNextObjectHint = 0;
329}
330
331status_t Parcel::setDataCapacity(size_t size)
332{
333    if (size > mDataSize) return continueWrite(size);
334    return NO_ERROR;
335}
336
337status_t Parcel::setData(const uint8_t* buffer, size_t len)
338{
339    status_t err = restartWrite(len);
340    if (err == NO_ERROR) {
341        memcpy(const_cast<uint8_t*>(data()), buffer, len);
342        mDataSize = len;
343        mFdsKnown = false;
344    }
345    return err;
346}
347
348status_t Parcel::appendFrom(Parcel *parcel, size_t offset, size_t len)
349{
350    const sp<ProcessState> proc(ProcessState::self());
351    status_t err;
352    uint8_t *data = parcel->mData;
353    size_t *objects = parcel->mObjects;
354    size_t size = parcel->mObjectsSize;
355    int startPos = mDataPos;
356    int firstIndex = -1, lastIndex = -2;
357
358    if (len == 0) {
359        return NO_ERROR;
360    }
361
362    // range checks against the source parcel size
363    if ((offset > parcel->mDataSize)
364            || (len > parcel->mDataSize)
365            || (offset + len > parcel->mDataSize)) {
366        return BAD_VALUE;
367    }
368
369    // Count objects in range
370    for (int i = 0; i < (int) size; i++) {
371        size_t off = objects[i];
372        if ((off >= offset) && (off < offset + len)) {
373            if (firstIndex == -1) {
374                firstIndex = i;
375            }
376            lastIndex = i;
377        }
378    }
379    int numObjects = lastIndex - firstIndex + 1;
380
381    // grow data
382    err = growData(len);
383    if (err != NO_ERROR) {
384        return err;
385    }
386
387    // append data
388    memcpy(mData + mDataPos, data + offset, len);
389    mDataPos += len;
390    mDataSize += len;
391
392    if (numObjects > 0) {
393        // grow objects
394        if (mObjectsCapacity < mObjectsSize + numObjects) {
395            int newSize = ((mObjectsSize + numObjects)*3)/2;
396            size_t *objects =
397                (size_t*)realloc(mObjects, newSize*sizeof(size_t));
398            if (objects == (size_t*)0) {
399                return NO_MEMORY;
400            }
401            mObjects = objects;
402            mObjectsCapacity = newSize;
403        }
404
405        // append and acquire objects
406        int idx = mObjectsSize;
407        for (int i = firstIndex; i <= lastIndex; i++) {
408            size_t off = objects[i] - offset + startPos;
409            mObjects[idx++] = off;
410            mObjectsSize++;
411
412            const flat_binder_object* flat
413                = reinterpret_cast<flat_binder_object*>(mData + off);
414            acquire_object(proc, *flat, this);
415
416            // take note if the object is a file descriptor
417            if (flat->type == BINDER_TYPE_FD) {
418                mHasFds = mFdsKnown = true;
419            }
420        }
421    }
422
423    return NO_ERROR;
424}
425
426bool Parcel::hasFileDescriptors() const
427{
428    if (!mFdsKnown) {
429        scanForFds();
430    }
431    return mHasFds;
432}
433
434status_t Parcel::writeInterfaceToken(const String16& interface)
435{
436    // currently the interface identification token is just its name as a string
437    return writeString16(interface);
438}
439
440bool Parcel::enforceInterface(const String16& interface) const
441{
442    String16 str = readString16();
443    if (str == interface) {
444        return true;
445    } else {
446        LOGW("**** enforceInterface() expected '%s' but read '%s'\n",
447                String8(interface).string(), String8(str).string());
448        return false;
449    }
450}
451
452const size_t* Parcel::objects() const
453{
454    return mObjects;
455}
456
457size_t Parcel::objectsCount() const
458{
459    return mObjectsSize;
460}
461
462status_t Parcel::errorCheck() const
463{
464    return mError;
465}
466
467void Parcel::setError(status_t err)
468{
469    mError = err;
470}
471
472status_t Parcel::finishWrite(size_t len)
473{
474    //printf("Finish write of %d\n", len);
475    mDataPos += len;
476    LOGV("finishWrite Setting data pos of %p to %d\n", this, mDataPos);
477    if (mDataPos > mDataSize) {
478        mDataSize = mDataPos;
479        LOGV("finishWrite Setting data size of %p to %d\n", this, mDataSize);
480    }
481    //printf("New pos=%d, size=%d\n", mDataPos, mDataSize);
482    return NO_ERROR;
483}
484
485status_t Parcel::writeUnpadded(const void* data, size_t len)
486{
487    size_t end = mDataPos + len;
488    if (end < mDataPos) {
489        // integer overflow
490        return BAD_VALUE;
491    }
492
493    if (end <= mDataCapacity) {
494restart_write:
495        memcpy(mData+mDataPos, data, len);
496        return finishWrite(len);
497    }
498
499    status_t err = growData(len);
500    if (err == NO_ERROR) goto restart_write;
501    return err;
502}
503
504status_t Parcel::write(const void* data, size_t len)
505{
506    void* const d = writeInplace(len);
507    if (d) {
508        memcpy(d, data, len);
509        return NO_ERROR;
510    }
511    return mError;
512}
513
514void* Parcel::writeInplace(size_t len)
515{
516    const size_t padded = PAD_SIZE(len);
517
518    // sanity check for integer overflow
519    if (mDataPos+padded < mDataPos) {
520        return NULL;
521    }
522
523    if ((mDataPos+padded) <= mDataCapacity) {
524restart_write:
525        //printf("Writing %ld bytes, padded to %ld\n", len, padded);
526        uint8_t* const data = mData+mDataPos;
527
528        // Need to pad at end?
529        if (padded != len) {
530#if BYTE_ORDER == BIG_ENDIAN
531            static const uint32_t mask[4] = {
532                0x00000000, 0xffffff00, 0xffff0000, 0xff000000
533            };
534#endif
535#if BYTE_ORDER == LITTLE_ENDIAN
536            static const uint32_t mask[4] = {
537                0x00000000, 0x00ffffff, 0x0000ffff, 0x000000ff
538            };
539#endif
540            //printf("Applying pad mask: %p to %p\n", (void*)mask[padded-len],
541            //    *reinterpret_cast<void**>(data+padded-4));
542            *reinterpret_cast<uint32_t*>(data+padded-4) &= mask[padded-len];
543        }
544
545        finishWrite(padded);
546        return data;
547    }
548
549    status_t err = growData(padded);
550    if (err == NO_ERROR) goto restart_write;
551    return NULL;
552}
553
554status_t Parcel::writeInt32(int32_t val)
555{
556    if ((mDataPos+sizeof(val)) <= mDataCapacity) {
557restart_write:
558        *reinterpret_cast<int32_t*>(mData+mDataPos) = val;
559        return finishWrite(sizeof(val));
560    }
561
562    status_t err = growData(sizeof(val));
563    if (err == NO_ERROR) goto restart_write;
564    return err;
565}
566
567status_t Parcel::writeInt64(int64_t val)
568{
569    if ((mDataPos+sizeof(val)) <= mDataCapacity) {
570restart_write:
571        *reinterpret_cast<int64_t*>(mData+mDataPos) = val;
572        return finishWrite(sizeof(val));
573    }
574
575    status_t err = growData(sizeof(val));
576    if (err == NO_ERROR) goto restart_write;
577    return err;
578}
579
580status_t Parcel::writeFloat(float val)
581{
582    if ((mDataPos+sizeof(val)) <= mDataCapacity) {
583restart_write:
584        *reinterpret_cast<float*>(mData+mDataPos) = val;
585        return finishWrite(sizeof(val));
586    }
587
588    status_t err = growData(sizeof(val));
589    if (err == NO_ERROR) goto restart_write;
590    return err;
591}
592
593status_t Parcel::writeDouble(double val)
594{
595    if ((mDataPos+sizeof(val)) <= mDataCapacity) {
596restart_write:
597        *reinterpret_cast<double*>(mData+mDataPos) = val;
598        return finishWrite(sizeof(val));
599    }
600
601    status_t err = growData(sizeof(val));
602    if (err == NO_ERROR) goto restart_write;
603    return err;
604}
605
606status_t Parcel::writeCString(const char* str)
607{
608    return write(str, strlen(str)+1);
609}
610
611status_t Parcel::writeString8(const String8& str)
612{
613    status_t err = writeInt32(str.bytes());
614    if (err == NO_ERROR) {
615        err = write(str.string(), str.bytes()+1);
616    }
617    return err;
618}
619
620status_t Parcel::writeString16(const String16& str)
621{
622    return writeString16(str.string(), str.size());
623}
624
625status_t Parcel::writeString16(const char16_t* str, size_t len)
626{
627    if (str == NULL) return writeInt32(-1);
628
629    status_t err = writeInt32(len);
630    if (err == NO_ERROR) {
631        len *= sizeof(char16_t);
632        uint8_t* data = (uint8_t*)writeInplace(len+sizeof(char16_t));
633        if (data) {
634            memcpy(data, str, len);
635            *reinterpret_cast<char16_t*>(data+len) = 0;
636            return NO_ERROR;
637        }
638        err = mError;
639    }
640    return err;
641}
642
643status_t Parcel::writeStrongBinder(const sp<IBinder>& val)
644{
645    return flatten_binder(ProcessState::self(), val, this);
646}
647
648status_t Parcel::writeWeakBinder(const wp<IBinder>& val)
649{
650    return flatten_binder(ProcessState::self(), val, this);
651}
652
653status_t Parcel::writeNativeHandle(const native_handle& handle)
654{
655    if (handle.version != sizeof(native_handle))
656        return BAD_TYPE;
657
658    status_t err;
659    err = writeInt32(handle.numFds);
660    if (err != NO_ERROR) return err;
661
662    err = writeInt32(handle.numInts);
663    if (err != NO_ERROR) return err;
664
665    for (int i=0 ; err==NO_ERROR && i<handle.numFds ; i++)
666        err = writeDupFileDescriptor(handle.data[i]);
667
668    if (err != NO_ERROR) {
669        LOGD("write native handle, write dup fd failed");
670        return err;
671    }
672
673    err = write(handle.data + handle.numFds, sizeof(int)*handle.numInts);
674
675    return err;
676}
677
678status_t Parcel::writeFileDescriptor(int fd)
679{
680    flat_binder_object obj;
681    obj.type = BINDER_TYPE_FD;
682    obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS;
683    obj.handle = fd;
684    obj.cookie = (void*)0;
685    return writeObject(obj, true);
686}
687
688status_t Parcel::writeDupFileDescriptor(int fd)
689{
690    flat_binder_object obj;
691    obj.type = BINDER_TYPE_FD;
692    obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS;
693    obj.handle = dup(fd);
694    obj.cookie = (void*)1;
695    return writeObject(obj, true);
696}
697
698status_t Parcel::writeObject(const flat_binder_object& val, bool nullMetaData)
699{
700    const bool enoughData = (mDataPos+sizeof(val)) <= mDataCapacity;
701    const bool enoughObjects = mObjectsSize < mObjectsCapacity;
702    if (enoughData && enoughObjects) {
703restart_write:
704        *reinterpret_cast<flat_binder_object*>(mData+mDataPos) = val;
705
706        // Need to write meta-data?
707        if (nullMetaData || val.binder != NULL) {
708            mObjects[mObjectsSize] = mDataPos;
709            acquire_object(ProcessState::self(), val, this);
710            mObjectsSize++;
711        }
712
713        // remember if it's a file descriptor
714        if (val.type == BINDER_TYPE_FD) {
715            mHasFds = mFdsKnown = true;
716        }
717
718        return finishWrite(sizeof(flat_binder_object));
719    }
720
721    if (!enoughData) {
722        const status_t err = growData(sizeof(val));
723        if (err != NO_ERROR) return err;
724    }
725    if (!enoughObjects) {
726        size_t newSize = ((mObjectsSize+2)*3)/2;
727        size_t* objects = (size_t*)realloc(mObjects, newSize*sizeof(size_t));
728        if (objects == NULL) return NO_MEMORY;
729        mObjects = objects;
730        mObjectsCapacity = newSize;
731    }
732
733    goto restart_write;
734}
735
736
737void Parcel::remove(size_t start, size_t amt)
738{
739    LOG_ALWAYS_FATAL("Parcel::remove() not yet implemented!");
740}
741
742status_t Parcel::read(void* outData, size_t len) const
743{
744    if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize) {
745        memcpy(outData, mData+mDataPos, len);
746        mDataPos += PAD_SIZE(len);
747        LOGV("read Setting data pos of %p to %d\n", this, mDataPos);
748        return NO_ERROR;
749    }
750    return NOT_ENOUGH_DATA;
751}
752
753const void* Parcel::readInplace(size_t len) const
754{
755    if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize) {
756        const void* data = mData+mDataPos;
757        mDataPos += PAD_SIZE(len);
758        LOGV("readInplace Setting data pos of %p to %d\n", this, mDataPos);
759        return data;
760    }
761    return NULL;
762}
763
764status_t Parcel::readInt32(int32_t *pArg) const
765{
766    if ((mDataPos+sizeof(int32_t)) <= mDataSize) {
767        const void* data = mData+mDataPos;
768        mDataPos += sizeof(int32_t);
769        *pArg =  *reinterpret_cast<const int32_t*>(data);
770        return NO_ERROR;
771    } else {
772        return NOT_ENOUGH_DATA;
773    }
774}
775
776int32_t Parcel::readInt32() const
777{
778    if ((mDataPos+sizeof(int32_t)) <= mDataSize) {
779        const void* data = mData+mDataPos;
780        mDataPos += sizeof(int32_t);
781        LOGV("readInt32 Setting data pos of %p to %d\n", this, mDataPos);
782        return *reinterpret_cast<const int32_t*>(data);
783    }
784    return 0;
785}
786
787
788status_t Parcel::readInt64(int64_t *pArg) const
789{
790    if ((mDataPos+sizeof(int64_t)) <= mDataSize) {
791        const void* data = mData+mDataPos;
792        mDataPos += sizeof(int64_t);
793        *pArg = *reinterpret_cast<const int64_t*>(data);
794        LOGV("readInt64 Setting data pos of %p to %d\n", this, mDataPos);
795        return NO_ERROR;
796    } else {
797        return NOT_ENOUGH_DATA;
798    }
799}
800
801
802int64_t Parcel::readInt64() const
803{
804    if ((mDataPos+sizeof(int64_t)) <= mDataSize) {
805        const void* data = mData+mDataPos;
806        mDataPos += sizeof(int64_t);
807        LOGV("readInt64 Setting data pos of %p to %d\n", this, mDataPos);
808        return *reinterpret_cast<const int64_t*>(data);
809    }
810    return 0;
811}
812
813status_t Parcel::readFloat(float *pArg) const
814{
815    if ((mDataPos+sizeof(float)) <= mDataSize) {
816        const void* data = mData+mDataPos;
817        mDataPos += sizeof(float);
818        LOGV("readFloat Setting data pos of %p to %d\n", this, mDataPos);
819        *pArg = *reinterpret_cast<const float*>(data);
820        return NO_ERROR;
821    } else {
822        return NOT_ENOUGH_DATA;
823    }
824}
825
826
827float Parcel::readFloat() const
828{
829    if ((mDataPos+sizeof(float)) <= mDataSize) {
830        const void* data = mData+mDataPos;
831        mDataPos += sizeof(float);
832        LOGV("readFloat Setting data pos of %p to %d\n", this, mDataPos);
833        return *reinterpret_cast<const float*>(data);
834    }
835    return 0;
836}
837
838status_t Parcel::readDouble(double *pArg) const
839{
840    if ((mDataPos+sizeof(double)) <= mDataSize) {
841        const void* data = mData+mDataPos;
842        mDataPos += sizeof(double);
843        LOGV("readDouble Setting data pos of %p to %d\n", this, mDataPos);
844        *pArg = *reinterpret_cast<const double*>(data);
845        return NO_ERROR;
846    } else {
847        return NOT_ENOUGH_DATA;
848    }
849}
850
851
852double Parcel::readDouble() const
853{
854    if ((mDataPos+sizeof(double)) <= mDataSize) {
855        const void* data = mData+mDataPos;
856        mDataPos += sizeof(double);
857        LOGV("readDouble Setting data pos of %p to %d\n", this, mDataPos);
858        return *reinterpret_cast<const double*>(data);
859    }
860    return 0;
861}
862
863
864const char* Parcel::readCString() const
865{
866    const size_t avail = mDataSize-mDataPos;
867    if (avail > 0) {
868        const char* str = reinterpret_cast<const char*>(mData+mDataPos);
869        // is the string's trailing NUL within the parcel's valid bounds?
870        const char* eos = reinterpret_cast<const char*>(memchr(str, 0, avail));
871        if (eos) {
872            const size_t len = eos - str;
873            mDataPos += PAD_SIZE(len+1);
874            LOGV("readCString Setting data pos of %p to %d\n", this, mDataPos);
875            return str;
876        }
877    }
878    return NULL;
879}
880
881String8 Parcel::readString8() const
882{
883    int32_t size = readInt32();
884    // watch for potential int overflow adding 1 for trailing NUL
885    if (size > 0 && size < INT32_MAX) {
886        const char* str = (const char*)readInplace(size+1);
887        if (str) return String8(str, size);
888    }
889    return String8();
890}
891
892String16 Parcel::readString16() const
893{
894    size_t len;
895    const char16_t* str = readString16Inplace(&len);
896    if (str) return String16(str, len);
897    LOGE("Reading a NULL string not supported here.");
898    return String16();
899}
900
901const char16_t* Parcel::readString16Inplace(size_t* outLen) const
902{
903    int32_t size = readInt32();
904    // watch for potential int overflow from size+1
905    if (size >= 0 && size < INT32_MAX) {
906        *outLen = size;
907        const char16_t* str = (const char16_t*)readInplace((size+1)*sizeof(char16_t));
908        if (str != NULL) {
909            return str;
910        }
911    }
912    *outLen = 0;
913    return NULL;
914}
915
916sp<IBinder> Parcel::readStrongBinder() const
917{
918    sp<IBinder> val;
919    unflatten_binder(ProcessState::self(), *this, &val);
920    return val;
921}
922
923wp<IBinder> Parcel::readWeakBinder() const
924{
925    wp<IBinder> val;
926    unflatten_binder(ProcessState::self(), *this, &val);
927    return val;
928}
929
930
931native_handle* Parcel::readNativeHandle(native_handle* (*alloc)(void*, int, int), void* cookie) const
932{
933    int numFds, numInts;
934    status_t err;
935    err = readInt32(&numFds);
936    if (err != NO_ERROR) return 0;
937    err = readInt32(&numInts);
938    if (err != NO_ERROR) return 0;
939
940    native_handle* h;
941    if (alloc == 0) {
942        size_t size = sizeof(native_handle) + sizeof(int)*(numFds + numInts);
943        h = (native_handle*)malloc(size);
944        h->version = sizeof(native_handle);
945        h->numFds = numFds;
946        h->numInts = numInts;
947    } else {
948        h = alloc(cookie, numFds, numInts);
949        if (h->version != sizeof(native_handle)) {
950            return 0;
951        }
952    }
953    for (int i=0 ; err==NO_ERROR && i<numFds ; i++) {
954        h->data[i] = dup(readFileDescriptor());
955        if (h->data[i] < 0) err = BAD_VALUE;
956    }
957
958    err = read(h->data + numFds, sizeof(int)*numInts);
959
960    if (err != NO_ERROR) {
961        if (alloc == 0) {
962            free(h);
963        }
964        h = 0;
965    }
966    return h;
967}
968
969
970int Parcel::readFileDescriptor() const
971{
972    const flat_binder_object* flat = readObject(true);
973    if (flat) {
974        switch (flat->type) {
975            case BINDER_TYPE_FD:
976                //LOGI("Returning file descriptor %ld from parcel %p\n", flat->handle, this);
977                return flat->handle;
978        }
979    }
980    return BAD_TYPE;
981}
982
983const flat_binder_object* Parcel::readObject(bool nullMetaData) const
984{
985    const size_t DPOS = mDataPos;
986    if ((DPOS+sizeof(flat_binder_object)) <= mDataSize) {
987        const flat_binder_object* obj
988                = reinterpret_cast<const flat_binder_object*>(mData+DPOS);
989        mDataPos = DPOS + sizeof(flat_binder_object);
990        if (!nullMetaData && (obj->cookie == NULL && obj->binder == NULL)) {
991            // When transferring a NULL object, we don't write it into
992            // the object list, so we don't want to check for it when
993            // reading.
994            LOGV("readObject Setting data pos of %p to %d\n", this, mDataPos);
995            return obj;
996        }
997
998        // Ensure that this object is valid...
999        size_t* const OBJS = mObjects;
1000        const size_t N = mObjectsSize;
1001        size_t opos = mNextObjectHint;
1002
1003        if (N > 0) {
1004            LOGV("Parcel %p looking for obj at %d, hint=%d\n",
1005                 this, DPOS, opos);
1006
1007            // Start at the current hint position, looking for an object at
1008            // the current data position.
1009            if (opos < N) {
1010                while (opos < (N-1) && OBJS[opos] < DPOS) {
1011                    opos++;
1012                }
1013            } else {
1014                opos = N-1;
1015            }
1016            if (OBJS[opos] == DPOS) {
1017                // Found it!
1018                LOGV("Parcel found obj %d at index %d with forward search",
1019                     this, DPOS, opos);
1020                mNextObjectHint = opos+1;
1021                LOGV("readObject Setting data pos of %p to %d\n", this, mDataPos);
1022                return obj;
1023            }
1024
1025            // Look backwards for it...
1026            while (opos > 0 && OBJS[opos] > DPOS) {
1027                opos--;
1028            }
1029            if (OBJS[opos] == DPOS) {
1030                // Found it!
1031                LOGV("Parcel found obj %d at index %d with backward search",
1032                     this, DPOS, opos);
1033                mNextObjectHint = opos+1;
1034                LOGV("readObject Setting data pos of %p to %d\n", this, mDataPos);
1035                return obj;
1036            }
1037        }
1038        LOGW("Attempt to read object from Parcel %p at offset %d that is not in the object list",
1039             this, DPOS);
1040    }
1041    return NULL;
1042}
1043
1044void Parcel::closeFileDescriptors()
1045{
1046    size_t i = mObjectsSize;
1047    if (i > 0) {
1048        //LOGI("Closing file descriptors for %d objects...", mObjectsSize);
1049    }
1050    while (i > 0) {
1051        i--;
1052        const flat_binder_object* flat
1053            = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]);
1054        if (flat->type == BINDER_TYPE_FD) {
1055            //LOGI("Closing fd: %ld\n", flat->handle);
1056            close(flat->handle);
1057        }
1058    }
1059}
1060
1061const uint8_t* Parcel::ipcData() const
1062{
1063    return mData;
1064}
1065
1066size_t Parcel::ipcDataSize() const
1067{
1068    return (mDataSize > mDataPos ? mDataSize : mDataPos);
1069}
1070
1071const size_t* Parcel::ipcObjects() const
1072{
1073    return mObjects;
1074}
1075
1076size_t Parcel::ipcObjectsCount() const
1077{
1078    return mObjectsSize;
1079}
1080
1081void Parcel::ipcSetDataReference(const uint8_t* data, size_t dataSize,
1082    const size_t* objects, size_t objectsCount, release_func relFunc, void* relCookie)
1083{
1084    freeDataNoInit();
1085    mError = NO_ERROR;
1086    mData = const_cast<uint8_t*>(data);
1087    mDataSize = mDataCapacity = dataSize;
1088    //LOGI("setDataReference Setting data size of %p to %lu (pid=%d)\n", this, mDataSize, getpid());
1089    mDataPos = 0;
1090    LOGV("setDataReference Setting data pos of %p to %d\n", this, mDataPos);
1091    mObjects = const_cast<size_t*>(objects);
1092    mObjectsSize = mObjectsCapacity = objectsCount;
1093    mNextObjectHint = 0;
1094    mOwner = relFunc;
1095    mOwnerCookie = relCookie;
1096    scanForFds();
1097}
1098
1099void Parcel::print(TextOutput& to, uint32_t flags) const
1100{
1101    to << "Parcel(";
1102
1103    if (errorCheck() != NO_ERROR) {
1104        const status_t err = errorCheck();
1105        to << "Error: " << (void*)err << " \"" << strerror(-err) << "\"";
1106    } else if (dataSize() > 0) {
1107        const uint8_t* DATA = data();
1108        to << indent << HexDump(DATA, dataSize()) << dedent;
1109        const size_t* OBJS = objects();
1110        const size_t N = objectsCount();
1111        for (size_t i=0; i<N; i++) {
1112            const flat_binder_object* flat
1113                = reinterpret_cast<const flat_binder_object*>(DATA+OBJS[i]);
1114            to << endl << "Object #" << i << " @ " << (void*)OBJS[i] << ": "
1115                << TypeCode(flat->type & 0x7f7f7f00)
1116                << " = " << flat->binder;
1117        }
1118    } else {
1119        to << "NULL";
1120    }
1121
1122    to << ")";
1123}
1124
1125void Parcel::releaseObjects()
1126{
1127    const sp<ProcessState> proc(ProcessState::self());
1128    size_t i = mObjectsSize;
1129    uint8_t* const data = mData;
1130    size_t* const objects = mObjects;
1131    while (i > 0) {
1132        i--;
1133        const flat_binder_object* flat
1134            = reinterpret_cast<flat_binder_object*>(data+objects[i]);
1135        release_object(proc, *flat, this);
1136    }
1137}
1138
1139void Parcel::acquireObjects()
1140{
1141    const sp<ProcessState> proc(ProcessState::self());
1142    size_t i = mObjectsSize;
1143    uint8_t* const data = mData;
1144    size_t* const objects = mObjects;
1145    while (i > 0) {
1146        i--;
1147        const flat_binder_object* flat
1148            = reinterpret_cast<flat_binder_object*>(data+objects[i]);
1149        acquire_object(proc, *flat, this);
1150    }
1151}
1152
1153void Parcel::freeData()
1154{
1155    freeDataNoInit();
1156    initState();
1157}
1158
1159void Parcel::freeDataNoInit()
1160{
1161    if (mOwner) {
1162        //LOGI("Freeing data ref of %p (pid=%d)\n", this, getpid());
1163        mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie);
1164    } else {
1165        releaseObjects();
1166        if (mData) free(mData);
1167        if (mObjects) free(mObjects);
1168    }
1169}
1170
1171status_t Parcel::growData(size_t len)
1172{
1173    size_t newSize = ((mDataSize+len)*3)/2;
1174    return (newSize <= mDataSize)
1175            ? (status_t) NO_MEMORY
1176            : continueWrite(newSize);
1177}
1178
1179status_t Parcel::restartWrite(size_t desired)
1180{
1181    if (mOwner) {
1182        freeData();
1183        return continueWrite(desired);
1184    }
1185
1186    uint8_t* data = (uint8_t*)realloc(mData, desired);
1187    if (!data && desired > mDataCapacity) {
1188        mError = NO_MEMORY;
1189        return NO_MEMORY;
1190    }
1191
1192    releaseObjects();
1193
1194    if (data) {
1195        mData = data;
1196        mDataCapacity = desired;
1197    }
1198
1199    mDataSize = mDataPos = 0;
1200    LOGV("restartWrite Setting data size of %p to %d\n", this, mDataSize);
1201    LOGV("restartWrite Setting data pos of %p to %d\n", this, mDataPos);
1202
1203    free(mObjects);
1204    mObjects = NULL;
1205    mObjectsSize = mObjectsCapacity = 0;
1206    mNextObjectHint = 0;
1207    mHasFds = false;
1208    mFdsKnown = true;
1209
1210    return NO_ERROR;
1211}
1212
1213status_t Parcel::continueWrite(size_t desired)
1214{
1215    // If shrinking, first adjust for any objects that appear
1216    // after the new data size.
1217    size_t objectsSize = mObjectsSize;
1218    if (desired < mDataSize) {
1219        if (desired == 0) {
1220            objectsSize = 0;
1221        } else {
1222            while (objectsSize > 0) {
1223                if (mObjects[objectsSize-1] < desired)
1224                    break;
1225                objectsSize--;
1226            }
1227        }
1228    }
1229
1230    if (mOwner) {
1231        // If the size is going to zero, just release the owner's data.
1232        if (desired == 0) {
1233            freeData();
1234            return NO_ERROR;
1235        }
1236
1237        // If there is a different owner, we need to take
1238        // posession.
1239        uint8_t* data = (uint8_t*)malloc(desired);
1240        if (!data) {
1241            mError = NO_MEMORY;
1242            return NO_MEMORY;
1243        }
1244        size_t* objects = NULL;
1245
1246        if (objectsSize) {
1247            objects = (size_t*)malloc(objectsSize*sizeof(size_t));
1248            if (!objects) {
1249                mError = NO_MEMORY;
1250                return NO_MEMORY;
1251            }
1252
1253            // Little hack to only acquire references on objects
1254            // we will be keeping.
1255            size_t oldObjectsSize = mObjectsSize;
1256            mObjectsSize = objectsSize;
1257            acquireObjects();
1258            mObjectsSize = oldObjectsSize;
1259        }
1260
1261        if (mData) {
1262            memcpy(data, mData, mDataSize < desired ? mDataSize : desired);
1263        }
1264        if (objects && mObjects) {
1265            memcpy(objects, mObjects, objectsSize*sizeof(size_t));
1266        }
1267        //LOGI("Freeing data ref of %p (pid=%d)\n", this, getpid());
1268        mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie);
1269        mOwner = NULL;
1270
1271        mData = data;
1272        mObjects = objects;
1273        mDataSize = (mDataSize < desired) ? mDataSize : desired;
1274        LOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize);
1275        mDataCapacity = desired;
1276        mObjectsSize = mObjectsCapacity = objectsSize;
1277        mNextObjectHint = 0;
1278
1279    } else if (mData) {
1280        if (objectsSize < mObjectsSize) {
1281            // Need to release refs on any objects we are dropping.
1282            const sp<ProcessState> proc(ProcessState::self());
1283            for (size_t i=objectsSize; i<mObjectsSize; i++) {
1284                const flat_binder_object* flat
1285                    = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]);
1286                if (flat->type == BINDER_TYPE_FD) {
1287                    // will need to rescan because we may have lopped off the only FDs
1288                    mFdsKnown = false;
1289                }
1290                release_object(proc, *flat, this);
1291            }
1292            size_t* objects =
1293                (size_t*)realloc(mObjects, objectsSize*sizeof(size_t));
1294            if (objects) {
1295                mObjects = objects;
1296            }
1297            mObjectsSize = objectsSize;
1298            mNextObjectHint = 0;
1299        }
1300
1301        // We own the data, so we can just do a realloc().
1302        if (desired > mDataCapacity) {
1303            uint8_t* data = (uint8_t*)realloc(mData, desired);
1304            if (data) {
1305                mData = data;
1306                mDataCapacity = desired;
1307            } else if (desired > mDataCapacity) {
1308                mError = NO_MEMORY;
1309                return NO_MEMORY;
1310            }
1311        } else {
1312            mDataSize = desired;
1313            LOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize);
1314            if (mDataPos > desired) {
1315                mDataPos = desired;
1316                LOGV("continueWrite Setting data pos of %p to %d\n", this, mDataPos);
1317            }
1318        }
1319
1320    } else {
1321        // This is the first data.  Easy!
1322        uint8_t* data = (uint8_t*)malloc(desired);
1323        if (!data) {
1324            mError = NO_MEMORY;
1325            return NO_MEMORY;
1326        }
1327
1328        if(!(mDataCapacity == 0 && mObjects == NULL
1329             && mObjectsCapacity == 0)) {
1330            LOGE("continueWrite: %d/%p/%d/%d", mDataCapacity, mObjects, mObjectsCapacity, desired);
1331        }
1332
1333        mData = data;
1334        mDataSize = mDataPos = 0;
1335        LOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize);
1336        LOGV("continueWrite Setting data pos of %p to %d\n", this, mDataPos);
1337        mDataCapacity = desired;
1338    }
1339
1340    return NO_ERROR;
1341}
1342
1343void Parcel::initState()
1344{
1345    mError = NO_ERROR;
1346    mData = 0;
1347    mDataSize = 0;
1348    mDataCapacity = 0;
1349    mDataPos = 0;
1350    LOGV("initState Setting data size of %p to %d\n", this, mDataSize);
1351    LOGV("initState Setting data pos of %p to %d\n", this, mDataPos);
1352    mObjects = NULL;
1353    mObjectsSize = 0;
1354    mObjectsCapacity = 0;
1355    mNextObjectHint = 0;
1356    mHasFds = false;
1357    mFdsKnown = true;
1358    mOwner = NULL;
1359}
1360
1361void Parcel::scanForFds() const
1362{
1363    bool hasFds = false;
1364    for (size_t i=0; i<mObjectsSize; i++) {
1365        const flat_binder_object* flat
1366            = reinterpret_cast<const flat_binder_object*>(mData + mObjects[i]);
1367        if (flat->type == BINDER_TYPE_FD) {
1368            hasFds = true;
1369            break;
1370        }
1371    }
1372    mHasFds = hasFds;
1373    mFdsKnown = true;
1374}
1375
1376}; // namespace android
1377