Parcel.cpp revision a47f02afb1e1f2c4abd9379c13903a5dde89d354 
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/Binder.h>
23#include <binder/BpBinder.h>
24#include <utils/Debug.h>
25#include <binder/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    err = write(handle->data + handle->numFds, sizeof(int)*handle->numInts);
673    return err;
674}
675
676status_t Parcel::writeFileDescriptor(int fd)
677{
678    flat_binder_object obj;
679    obj.type = BINDER_TYPE_FD;
680    obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS;
681    obj.handle = fd;
682    obj.cookie = (void*)0;
683    return writeObject(obj, true);
684}
685
686status_t Parcel::writeDupFileDescriptor(int fd)
687{
688    flat_binder_object obj;
689    obj.type = BINDER_TYPE_FD;
690    obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS;
691    obj.handle = dup(fd);
692    obj.cookie = (void*)1;
693    return writeObject(obj, true);
694}
695
696status_t Parcel::writeObject(const flat_binder_object& val, bool nullMetaData)
697{
698    const bool enoughData = (mDataPos+sizeof(val)) <= mDataCapacity;
699    const bool enoughObjects = mObjectsSize < mObjectsCapacity;
700    if (enoughData && enoughObjects) {
701restart_write:
702        *reinterpret_cast<flat_binder_object*>(mData+mDataPos) = val;
703
704        // Need to write meta-data?
705        if (nullMetaData || val.binder != NULL) {
706            mObjects[mObjectsSize] = mDataPos;
707            acquire_object(ProcessState::self(), val, this);
708            mObjectsSize++;
709        }
710
711        // remember if it's a file descriptor
712        if (val.type == BINDER_TYPE_FD) {
713            mHasFds = mFdsKnown = true;
714        }
715
716        return finishWrite(sizeof(flat_binder_object));
717    }
718
719    if (!enoughData) {
720        const status_t err = growData(sizeof(val));
721        if (err != NO_ERROR) return err;
722    }
723    if (!enoughObjects) {
724        size_t newSize = ((mObjectsSize+2)*3)/2;
725        size_t* objects = (size_t*)realloc(mObjects, newSize*sizeof(size_t));
726        if (objects == NULL) return NO_MEMORY;
727        mObjects = objects;
728        mObjectsCapacity = newSize;
729    }
730
731    goto restart_write;
732}
733
734
735void Parcel::remove(size_t start, size_t amt)
736{
737    LOG_ALWAYS_FATAL("Parcel::remove() not yet implemented!");
738}
739
740status_t Parcel::read(void* outData, size_t len) const
741{
742    if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize) {
743        memcpy(outData, mData+mDataPos, len);
744        mDataPos += PAD_SIZE(len);
745        LOGV("read Setting data pos of %p to %d\n", this, mDataPos);
746        return NO_ERROR;
747    }
748    return NOT_ENOUGH_DATA;
749}
750
751const void* Parcel::readInplace(size_t len) const
752{
753    if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize) {
754        const void* data = mData+mDataPos;
755        mDataPos += PAD_SIZE(len);
756        LOGV("readInplace Setting data pos of %p to %d\n", this, mDataPos);
757        return data;
758    }
759    return NULL;
760}
761
762status_t Parcel::readInt32(int32_t *pArg) const
763{
764    if ((mDataPos+sizeof(int32_t)) <= mDataSize) {
765        const void* data = mData+mDataPos;
766        mDataPos += sizeof(int32_t);
767        *pArg =  *reinterpret_cast<const int32_t*>(data);
768        return NO_ERROR;
769    } else {
770        return NOT_ENOUGH_DATA;
771    }
772}
773
774int32_t Parcel::readInt32() const
775{
776    if ((mDataPos+sizeof(int32_t)) <= mDataSize) {
777        const void* data = mData+mDataPos;
778        mDataPos += sizeof(int32_t);
779        LOGV("readInt32 Setting data pos of %p to %d\n", this, mDataPos);
780        return *reinterpret_cast<const int32_t*>(data);
781    }
782    return 0;
783}
784
785
786status_t Parcel::readInt64(int64_t *pArg) const
787{
788    if ((mDataPos+sizeof(int64_t)) <= mDataSize) {
789        const void* data = mData+mDataPos;
790        mDataPos += sizeof(int64_t);
791        *pArg = *reinterpret_cast<const int64_t*>(data);
792        LOGV("readInt64 Setting data pos of %p to %d\n", this, mDataPos);
793        return NO_ERROR;
794    } else {
795        return NOT_ENOUGH_DATA;
796    }
797}
798
799
800int64_t Parcel::readInt64() const
801{
802    if ((mDataPos+sizeof(int64_t)) <= mDataSize) {
803        const void* data = mData+mDataPos;
804        mDataPos += sizeof(int64_t);
805        LOGV("readInt64 Setting data pos of %p to %d\n", this, mDataPos);
806        return *reinterpret_cast<const int64_t*>(data);
807    }
808    return 0;
809}
810
811status_t Parcel::readFloat(float *pArg) const
812{
813    if ((mDataPos+sizeof(float)) <= mDataSize) {
814        const void* data = mData+mDataPos;
815        mDataPos += sizeof(float);
816        LOGV("readFloat Setting data pos of %p to %d\n", this, mDataPos);
817        *pArg = *reinterpret_cast<const float*>(data);
818        return NO_ERROR;
819    } else {
820        return NOT_ENOUGH_DATA;
821    }
822}
823
824
825float Parcel::readFloat() const
826{
827    if ((mDataPos+sizeof(float)) <= mDataSize) {
828        const void* data = mData+mDataPos;
829        mDataPos += sizeof(float);
830        LOGV("readFloat Setting data pos of %p to %d\n", this, mDataPos);
831        return *reinterpret_cast<const float*>(data);
832    }
833    return 0;
834}
835
836status_t Parcel::readDouble(double *pArg) const
837{
838    if ((mDataPos+sizeof(double)) <= mDataSize) {
839        const void* data = mData+mDataPos;
840        mDataPos += sizeof(double);
841        LOGV("readDouble Setting data pos of %p to %d\n", this, mDataPos);
842        *pArg = *reinterpret_cast<const double*>(data);
843        return NO_ERROR;
844    } else {
845        return NOT_ENOUGH_DATA;
846    }
847}
848
849
850double Parcel::readDouble() const
851{
852    if ((mDataPos+sizeof(double)) <= mDataSize) {
853        const void* data = mData+mDataPos;
854        mDataPos += sizeof(double);
855        LOGV("readDouble Setting data pos of %p to %d\n", this, mDataPos);
856        return *reinterpret_cast<const double*>(data);
857    }
858    return 0;
859}
860
861
862const char* Parcel::readCString() const
863{
864    const size_t avail = mDataSize-mDataPos;
865    if (avail > 0) {
866        const char* str = reinterpret_cast<const char*>(mData+mDataPos);
867        // is the string's trailing NUL within the parcel's valid bounds?
868        const char* eos = reinterpret_cast<const char*>(memchr(str, 0, avail));
869        if (eos) {
870            const size_t len = eos - str;
871            mDataPos += PAD_SIZE(len+1);
872            LOGV("readCString Setting data pos of %p to %d\n", this, mDataPos);
873            return str;
874        }
875    }
876    return NULL;
877}
878
879String8 Parcel::readString8() const
880{
881    int32_t size = readInt32();
882    // watch for potential int overflow adding 1 for trailing NUL
883    if (size > 0 && size < INT32_MAX) {
884        const char* str = (const char*)readInplace(size+1);
885        if (str) return String8(str, size);
886    }
887    return String8();
888}
889
890String16 Parcel::readString16() const
891{
892    size_t len;
893    const char16_t* str = readString16Inplace(&len);
894    if (str) return String16(str, len);
895    LOGE("Reading a NULL string not supported here.");
896    return String16();
897}
898
899const char16_t* Parcel::readString16Inplace(size_t* outLen) const
900{
901    int32_t size = readInt32();
902    // watch for potential int overflow from size+1
903    if (size >= 0 && size < INT32_MAX) {
904        *outLen = size;
905        const char16_t* str = (const char16_t*)readInplace((size+1)*sizeof(char16_t));
906        if (str != NULL) {
907            return str;
908        }
909    }
910    *outLen = 0;
911    return NULL;
912}
913
914sp<IBinder> Parcel::readStrongBinder() const
915{
916    sp<IBinder> val;
917    unflatten_binder(ProcessState::self(), *this, &val);
918    return val;
919}
920
921wp<IBinder> Parcel::readWeakBinder() const
922{
923    wp<IBinder> val;
924    unflatten_binder(ProcessState::self(), *this, &val);
925    return val;
926}
927
928
929native_handle* Parcel::readNativeHandle() const
930{
931    int numFds, numInts;
932    status_t err;
933    err = readInt32(&numFds);
934    if (err != NO_ERROR) return 0;
935    err = readInt32(&numInts);
936    if (err != NO_ERROR) return 0;
937
938    native_handle* h = native_handle_create(numFds, numInts);
939    for (int i=0 ; err==NO_ERROR && i<numFds ; i++) {
940        h->data[i] = dup(readFileDescriptor());
941        if (h->data[i] < 0) err = BAD_VALUE;
942    }
943    err = read(h->data + numFds, sizeof(int)*numInts);
944    if (err != NO_ERROR) {
945        native_handle_close(h);
946        native_handle_delete(h);
947        h = 0;
948    }
949    return h;
950}
951
952
953int Parcel::readFileDescriptor() const
954{
955    const flat_binder_object* flat = readObject(true);
956    if (flat) {
957        switch (flat->type) {
958            case BINDER_TYPE_FD:
959                //LOGI("Returning file descriptor %ld from parcel %p\n", flat->handle, this);
960                return flat->handle;
961        }
962    }
963    return BAD_TYPE;
964}
965
966const flat_binder_object* Parcel::readObject(bool nullMetaData) const
967{
968    const size_t DPOS = mDataPos;
969    if ((DPOS+sizeof(flat_binder_object)) <= mDataSize) {
970        const flat_binder_object* obj
971                = reinterpret_cast<const flat_binder_object*>(mData+DPOS);
972        mDataPos = DPOS + sizeof(flat_binder_object);
973        if (!nullMetaData && (obj->cookie == NULL && obj->binder == NULL)) {
974            // When transferring a NULL object, we don't write it into
975            // the object list, so we don't want to check for it when
976            // reading.
977            LOGV("readObject Setting data pos of %p to %d\n", this, mDataPos);
978            return obj;
979        }
980
981        // Ensure that this object is valid...
982        size_t* const OBJS = mObjects;
983        const size_t N = mObjectsSize;
984        size_t opos = mNextObjectHint;
985
986        if (N > 0) {
987            LOGV("Parcel %p looking for obj at %d, hint=%d\n",
988                 this, DPOS, opos);
989
990            // Start at the current hint position, looking for an object at
991            // the current data position.
992            if (opos < N) {
993                while (opos < (N-1) && OBJS[opos] < DPOS) {
994                    opos++;
995                }
996            } else {
997                opos = N-1;
998            }
999            if (OBJS[opos] == DPOS) {
1000                // Found it!
1001                LOGV("Parcel found obj %d at index %d with forward search",
1002                     this, DPOS, opos);
1003                mNextObjectHint = opos+1;
1004                LOGV("readObject Setting data pos of %p to %d\n", this, mDataPos);
1005                return obj;
1006            }
1007
1008            // Look backwards for it...
1009            while (opos > 0 && OBJS[opos] > DPOS) {
1010                opos--;
1011            }
1012            if (OBJS[opos] == DPOS) {
1013                // Found it!
1014                LOGV("Parcel found obj %d at index %d with backward search",
1015                     this, DPOS, opos);
1016                mNextObjectHint = opos+1;
1017                LOGV("readObject Setting data pos of %p to %d\n", this, mDataPos);
1018                return obj;
1019            }
1020        }
1021        LOGW("Attempt to read object from Parcel %p at offset %d that is not in the object list",
1022             this, DPOS);
1023    }
1024    return NULL;
1025}
1026
1027void Parcel::closeFileDescriptors()
1028{
1029    size_t i = mObjectsSize;
1030    if (i > 0) {
1031        //LOGI("Closing file descriptors for %d objects...", mObjectsSize);
1032    }
1033    while (i > 0) {
1034        i--;
1035        const flat_binder_object* flat
1036            = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]);
1037        if (flat->type == BINDER_TYPE_FD) {
1038            //LOGI("Closing fd: %ld\n", flat->handle);
1039            close(flat->handle);
1040        }
1041    }
1042}
1043
1044const uint8_t* Parcel::ipcData() const
1045{
1046    return mData;
1047}
1048
1049size_t Parcel::ipcDataSize() const
1050{
1051    return (mDataSize > mDataPos ? mDataSize : mDataPos);
1052}
1053
1054const size_t* Parcel::ipcObjects() const
1055{
1056    return mObjects;
1057}
1058
1059size_t Parcel::ipcObjectsCount() const
1060{
1061    return mObjectsSize;
1062}
1063
1064void Parcel::ipcSetDataReference(const uint8_t* data, size_t dataSize,
1065    const size_t* objects, size_t objectsCount, release_func relFunc, void* relCookie)
1066{
1067    freeDataNoInit();
1068    mError = NO_ERROR;
1069    mData = const_cast<uint8_t*>(data);
1070    mDataSize = mDataCapacity = dataSize;
1071    //LOGI("setDataReference Setting data size of %p to %lu (pid=%d)\n", this, mDataSize, getpid());
1072    mDataPos = 0;
1073    LOGV("setDataReference Setting data pos of %p to %d\n", this, mDataPos);
1074    mObjects = const_cast<size_t*>(objects);
1075    mObjectsSize = mObjectsCapacity = objectsCount;
1076    mNextObjectHint = 0;
1077    mOwner = relFunc;
1078    mOwnerCookie = relCookie;
1079    scanForFds();
1080}
1081
1082void Parcel::print(TextOutput& to, uint32_t flags) const
1083{
1084    to << "Parcel(";
1085
1086    if (errorCheck() != NO_ERROR) {
1087        const status_t err = errorCheck();
1088        to << "Error: " << (void*)err << " \"" << strerror(-err) << "\"";
1089    } else if (dataSize() > 0) {
1090        const uint8_t* DATA = data();
1091        to << indent << HexDump(DATA, dataSize()) << dedent;
1092        const size_t* OBJS = objects();
1093        const size_t N = objectsCount();
1094        for (size_t i=0; i<N; i++) {
1095            const flat_binder_object* flat
1096                = reinterpret_cast<const flat_binder_object*>(DATA+OBJS[i]);
1097            to << endl << "Object #" << i << " @ " << (void*)OBJS[i] << ": "
1098                << TypeCode(flat->type & 0x7f7f7f00)
1099                << " = " << flat->binder;
1100        }
1101    } else {
1102        to << "NULL";
1103    }
1104
1105    to << ")";
1106}
1107
1108void Parcel::releaseObjects()
1109{
1110    const sp<ProcessState> proc(ProcessState::self());
1111    size_t i = mObjectsSize;
1112    uint8_t* const data = mData;
1113    size_t* const objects = mObjects;
1114    while (i > 0) {
1115        i--;
1116        const flat_binder_object* flat
1117            = reinterpret_cast<flat_binder_object*>(data+objects[i]);
1118        release_object(proc, *flat, this);
1119    }
1120}
1121
1122void Parcel::acquireObjects()
1123{
1124    const sp<ProcessState> proc(ProcessState::self());
1125    size_t i = mObjectsSize;
1126    uint8_t* const data = mData;
1127    size_t* const objects = mObjects;
1128    while (i > 0) {
1129        i--;
1130        const flat_binder_object* flat
1131            = reinterpret_cast<flat_binder_object*>(data+objects[i]);
1132        acquire_object(proc, *flat, this);
1133    }
1134}
1135
1136void Parcel::freeData()
1137{
1138    freeDataNoInit();
1139    initState();
1140}
1141
1142void Parcel::freeDataNoInit()
1143{
1144    if (mOwner) {
1145        //LOGI("Freeing data ref of %p (pid=%d)\n", this, getpid());
1146        mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie);
1147    } else {
1148        releaseObjects();
1149        if (mData) free(mData);
1150        if (mObjects) free(mObjects);
1151    }
1152}
1153
1154status_t Parcel::growData(size_t len)
1155{
1156    size_t newSize = ((mDataSize+len)*3)/2;
1157    return (newSize <= mDataSize)
1158            ? (status_t) NO_MEMORY
1159            : continueWrite(newSize);
1160}
1161
1162status_t Parcel::restartWrite(size_t desired)
1163{
1164    if (mOwner) {
1165        freeData();
1166        return continueWrite(desired);
1167    }
1168
1169    uint8_t* data = (uint8_t*)realloc(mData, desired);
1170    if (!data && desired > mDataCapacity) {
1171        mError = NO_MEMORY;
1172        return NO_MEMORY;
1173    }
1174
1175    releaseObjects();
1176
1177    if (data) {
1178        mData = data;
1179        mDataCapacity = desired;
1180    }
1181
1182    mDataSize = mDataPos = 0;
1183    LOGV("restartWrite Setting data size of %p to %d\n", this, mDataSize);
1184    LOGV("restartWrite Setting data pos of %p to %d\n", this, mDataPos);
1185
1186    free(mObjects);
1187    mObjects = NULL;
1188    mObjectsSize = mObjectsCapacity = 0;
1189    mNextObjectHint = 0;
1190    mHasFds = false;
1191    mFdsKnown = true;
1192
1193    return NO_ERROR;
1194}
1195
1196status_t Parcel::continueWrite(size_t desired)
1197{
1198    // If shrinking, first adjust for any objects that appear
1199    // after the new data size.
1200    size_t objectsSize = mObjectsSize;
1201    if (desired < mDataSize) {
1202        if (desired == 0) {
1203            objectsSize = 0;
1204        } else {
1205            while (objectsSize > 0) {
1206                if (mObjects[objectsSize-1] < desired)
1207                    break;
1208                objectsSize--;
1209            }
1210        }
1211    }
1212
1213    if (mOwner) {
1214        // If the size is going to zero, just release the owner's data.
1215        if (desired == 0) {
1216            freeData();
1217            return NO_ERROR;
1218        }
1219
1220        // If there is a different owner, we need to take
1221        // posession.
1222        uint8_t* data = (uint8_t*)malloc(desired);
1223        if (!data) {
1224            mError = NO_MEMORY;
1225            return NO_MEMORY;
1226        }
1227        size_t* objects = NULL;
1228
1229        if (objectsSize) {
1230            objects = (size_t*)malloc(objectsSize*sizeof(size_t));
1231            if (!objects) {
1232                mError = NO_MEMORY;
1233                return NO_MEMORY;
1234            }
1235
1236            // Little hack to only acquire references on objects
1237            // we will be keeping.
1238            size_t oldObjectsSize = mObjectsSize;
1239            mObjectsSize = objectsSize;
1240            acquireObjects();
1241            mObjectsSize = oldObjectsSize;
1242        }
1243
1244        if (mData) {
1245            memcpy(data, mData, mDataSize < desired ? mDataSize : desired);
1246        }
1247        if (objects && mObjects) {
1248            memcpy(objects, mObjects, objectsSize*sizeof(size_t));
1249        }
1250        //LOGI("Freeing data ref of %p (pid=%d)\n", this, getpid());
1251        mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie);
1252        mOwner = NULL;
1253
1254        mData = data;
1255        mObjects = objects;
1256        mDataSize = (mDataSize < desired) ? mDataSize : desired;
1257        LOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize);
1258        mDataCapacity = desired;
1259        mObjectsSize = mObjectsCapacity = objectsSize;
1260        mNextObjectHint = 0;
1261
1262    } else if (mData) {
1263        if (objectsSize < mObjectsSize) {
1264            // Need to release refs on any objects we are dropping.
1265            const sp<ProcessState> proc(ProcessState::self());
1266            for (size_t i=objectsSize; i<mObjectsSize; i++) {
1267                const flat_binder_object* flat
1268                    = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]);
1269                if (flat->type == BINDER_TYPE_FD) {
1270                    // will need to rescan because we may have lopped off the only FDs
1271                    mFdsKnown = false;
1272                }
1273                release_object(proc, *flat, this);
1274            }
1275            size_t* objects =
1276                (size_t*)realloc(mObjects, objectsSize*sizeof(size_t));
1277            if (objects) {
1278                mObjects = objects;
1279            }
1280            mObjectsSize = objectsSize;
1281            mNextObjectHint = 0;
1282        }
1283
1284        // We own the data, so we can just do a realloc().
1285        if (desired > mDataCapacity) {
1286            uint8_t* data = (uint8_t*)realloc(mData, desired);
1287            if (data) {
1288                mData = data;
1289                mDataCapacity = desired;
1290            } else if (desired > mDataCapacity) {
1291                mError = NO_MEMORY;
1292                return NO_MEMORY;
1293            }
1294        } else {
1295            mDataSize = desired;
1296            LOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize);
1297            if (mDataPos > desired) {
1298                mDataPos = desired;
1299                LOGV("continueWrite Setting data pos of %p to %d\n", this, mDataPos);
1300            }
1301        }
1302
1303    } else {
1304        // This is the first data.  Easy!
1305        uint8_t* data = (uint8_t*)malloc(desired);
1306        if (!data) {
1307            mError = NO_MEMORY;
1308            return NO_MEMORY;
1309        }
1310
1311        if(!(mDataCapacity == 0 && mObjects == NULL
1312             && mObjectsCapacity == 0)) {
1313            LOGE("continueWrite: %d/%p/%d/%d", mDataCapacity, mObjects, mObjectsCapacity, desired);
1314        }
1315
1316        mData = data;
1317        mDataSize = mDataPos = 0;
1318        LOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize);
1319        LOGV("continueWrite Setting data pos of %p to %d\n", this, mDataPos);
1320        mDataCapacity = desired;
1321    }
1322
1323    return NO_ERROR;
1324}
1325
1326void Parcel::initState()
1327{
1328    mError = NO_ERROR;
1329    mData = 0;
1330    mDataSize = 0;
1331    mDataCapacity = 0;
1332    mDataPos = 0;
1333    LOGV("initState Setting data size of %p to %d\n", this, mDataSize);
1334    LOGV("initState Setting data pos of %p to %d\n", this, mDataPos);
1335    mObjects = NULL;
1336    mObjectsSize = 0;
1337    mObjectsCapacity = 0;
1338    mNextObjectHint = 0;
1339    mHasFds = false;
1340    mFdsKnown = true;
1341    mOwner = NULL;
1342}
1343
1344void Parcel::scanForFds() const
1345{
1346    bool hasFds = false;
1347    for (size_t i=0; i<mObjectsSize; i++) {
1348        const flat_binder_object* flat
1349            = reinterpret_cast<const flat_binder_object*>(mData + mObjects[i]);
1350        if (flat->type == BINDER_TYPE_FD) {
1351            hasFds = true;
1352            break;
1353        }
1354    }
1355    mHasFds = hasFds;
1356    mFdsKnown = true;
1357}
1358
1359}; // namespace android
1360