Parcel.cpp revision 4e97f8c62f3eb3c51343e9f4bbd898992a13903d 
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            flat_binder_object* flat
413                = reinterpret_cast<flat_binder_object*>(mData + off);
414            acquire_object(proc, *flat, this);
415
416            if (flat->type == BINDER_TYPE_FD) {
417                // If this is a file descriptor, we need to dup it so the
418                // new Parcel now owns its own fd, and can declare that we
419                // officially know we have fds.
420                flat->handle = dup(flat->handle);
421                flat->cookie = (void*)1;
422                mHasFds = mFdsKnown = true;
423            }
424        }
425    }
426
427    return NO_ERROR;
428}
429
430bool Parcel::hasFileDescriptors() const
431{
432    if (!mFdsKnown) {
433        scanForFds();
434    }
435    return mHasFds;
436}
437
438status_t Parcel::writeInterfaceToken(const String16& interface)
439{
440    // currently the interface identification token is just its name as a string
441    return writeString16(interface);
442}
443
444bool Parcel::enforceInterface(const String16& interface) const
445{
446    String16 str = readString16();
447    if (str == interface) {
448        return true;
449    } else {
450        LOGW("**** enforceInterface() expected '%s' but read '%s'\n",
451                String8(interface).string(), String8(str).string());
452        return false;
453    }
454}
455
456const size_t* Parcel::objects() const
457{
458    return mObjects;
459}
460
461size_t Parcel::objectsCount() const
462{
463    return mObjectsSize;
464}
465
466status_t Parcel::errorCheck() const
467{
468    return mError;
469}
470
471void Parcel::setError(status_t err)
472{
473    mError = err;
474}
475
476status_t Parcel::finishWrite(size_t len)
477{
478    //printf("Finish write of %d\n", len);
479    mDataPos += len;
480    LOGV("finishWrite Setting data pos of %p to %d\n", this, mDataPos);
481    if (mDataPos > mDataSize) {
482        mDataSize = mDataPos;
483        LOGV("finishWrite Setting data size of %p to %d\n", this, mDataSize);
484    }
485    //printf("New pos=%d, size=%d\n", mDataPos, mDataSize);
486    return NO_ERROR;
487}
488
489status_t Parcel::writeUnpadded(const void* data, size_t len)
490{
491    size_t end = mDataPos + len;
492    if (end < mDataPos) {
493        // integer overflow
494        return BAD_VALUE;
495    }
496
497    if (end <= mDataCapacity) {
498restart_write:
499        memcpy(mData+mDataPos, data, len);
500        return finishWrite(len);
501    }
502
503    status_t err = growData(len);
504    if (err == NO_ERROR) goto restart_write;
505    return err;
506}
507
508status_t Parcel::write(const void* data, size_t len)
509{
510    void* const d = writeInplace(len);
511    if (d) {
512        memcpy(d, data, len);
513        return NO_ERROR;
514    }
515    return mError;
516}
517
518void* Parcel::writeInplace(size_t len)
519{
520    const size_t padded = PAD_SIZE(len);
521
522    // sanity check for integer overflow
523    if (mDataPos+padded < mDataPos) {
524        return NULL;
525    }
526
527    if ((mDataPos+padded) <= mDataCapacity) {
528restart_write:
529        //printf("Writing %ld bytes, padded to %ld\n", len, padded);
530        uint8_t* const data = mData+mDataPos;
531
532        // Need to pad at end?
533        if (padded != len) {
534#if BYTE_ORDER == BIG_ENDIAN
535            static const uint32_t mask[4] = {
536                0x00000000, 0xffffff00, 0xffff0000, 0xff000000
537            };
538#endif
539#if BYTE_ORDER == LITTLE_ENDIAN
540            static const uint32_t mask[4] = {
541                0x00000000, 0x00ffffff, 0x0000ffff, 0x000000ff
542            };
543#endif
544            //printf("Applying pad mask: %p to %p\n", (void*)mask[padded-len],
545            //    *reinterpret_cast<void**>(data+padded-4));
546            *reinterpret_cast<uint32_t*>(data+padded-4) &= mask[padded-len];
547        }
548
549        finishWrite(padded);
550        return data;
551    }
552
553    status_t err = growData(padded);
554    if (err == NO_ERROR) goto restart_write;
555    return NULL;
556}
557
558status_t Parcel::writeInt32(int32_t val)
559{
560    if ((mDataPos+sizeof(val)) <= mDataCapacity) {
561restart_write:
562        *reinterpret_cast<int32_t*>(mData+mDataPos) = val;
563        return finishWrite(sizeof(val));
564    }
565
566    status_t err = growData(sizeof(val));
567    if (err == NO_ERROR) goto restart_write;
568    return err;
569}
570
571status_t Parcel::writeInt64(int64_t val)
572{
573    if ((mDataPos+sizeof(val)) <= mDataCapacity) {
574restart_write:
575        *reinterpret_cast<int64_t*>(mData+mDataPos) = val;
576        return finishWrite(sizeof(val));
577    }
578
579    status_t err = growData(sizeof(val));
580    if (err == NO_ERROR) goto restart_write;
581    return err;
582}
583
584status_t Parcel::writeFloat(float val)
585{
586    if ((mDataPos+sizeof(val)) <= mDataCapacity) {
587restart_write:
588        *reinterpret_cast<float*>(mData+mDataPos) = val;
589        return finishWrite(sizeof(val));
590    }
591
592    status_t err = growData(sizeof(val));
593    if (err == NO_ERROR) goto restart_write;
594    return err;
595}
596
597status_t Parcel::writeDouble(double val)
598{
599    if ((mDataPos+sizeof(val)) <= mDataCapacity) {
600restart_write:
601        *reinterpret_cast<double*>(mData+mDataPos) = val;
602        return finishWrite(sizeof(val));
603    }
604
605    status_t err = growData(sizeof(val));
606    if (err == NO_ERROR) goto restart_write;
607    return err;
608}
609
610status_t Parcel::writeCString(const char* str)
611{
612    return write(str, strlen(str)+1);
613}
614
615status_t Parcel::writeString8(const String8& str)
616{
617    status_t err = writeInt32(str.bytes());
618    if (err == NO_ERROR) {
619        err = write(str.string(), str.bytes()+1);
620    }
621    return err;
622}
623
624status_t Parcel::writeString16(const String16& str)
625{
626    return writeString16(str.string(), str.size());
627}
628
629status_t Parcel::writeString16(const char16_t* str, size_t len)
630{
631    if (str == NULL) return writeInt32(-1);
632
633    status_t err = writeInt32(len);
634    if (err == NO_ERROR) {
635        len *= sizeof(char16_t);
636        uint8_t* data = (uint8_t*)writeInplace(len+sizeof(char16_t));
637        if (data) {
638            memcpy(data, str, len);
639            *reinterpret_cast<char16_t*>(data+len) = 0;
640            return NO_ERROR;
641        }
642        err = mError;
643    }
644    return err;
645}
646
647status_t Parcel::writeStrongBinder(const sp<IBinder>& val)
648{
649    return flatten_binder(ProcessState::self(), val, this);
650}
651
652status_t Parcel::writeWeakBinder(const wp<IBinder>& val)
653{
654    return flatten_binder(ProcessState::self(), val, this);
655}
656
657status_t Parcel::writeNativeHandle(const native_handle* handle)
658{
659    if (handle->version != sizeof(native_handle))
660        return BAD_TYPE;
661
662    status_t err;
663    err = writeInt32(handle->numFds);
664    if (err != NO_ERROR) return err;
665
666    err = writeInt32(handle->numInts);
667    if (err != NO_ERROR) return err;
668
669    for (int i=0 ; err==NO_ERROR && i<handle->numFds ; i++)
670        err = writeDupFileDescriptor(handle->data[i]);
671
672    if (err != NO_ERROR) {
673        LOGD("write native handle, write dup fd failed");
674        return err;
675    }
676    err = write(handle->data + handle->numFds, sizeof(int)*handle->numInts);
677    return err;
678}
679
680status_t Parcel::writeFileDescriptor(int fd)
681{
682    flat_binder_object obj;
683    obj.type = BINDER_TYPE_FD;
684    obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS;
685    obj.handle = fd;
686    obj.cookie = (void*)0;
687    return writeObject(obj, true);
688}
689
690status_t Parcel::writeDupFileDescriptor(int fd)
691{
692    flat_binder_object obj;
693    obj.type = BINDER_TYPE_FD;
694    obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS;
695    obj.handle = dup(fd);
696    obj.cookie = (void*)1;
697    return writeObject(obj, true);
698}
699
700status_t Parcel::writeObject(const flat_binder_object& val, bool nullMetaData)
701{
702    const bool enoughData = (mDataPos+sizeof(val)) <= mDataCapacity;
703    const bool enoughObjects = mObjectsSize < mObjectsCapacity;
704    if (enoughData && enoughObjects) {
705restart_write:
706        *reinterpret_cast<flat_binder_object*>(mData+mDataPos) = val;
707
708        // Need to write meta-data?
709        if (nullMetaData || val.binder != NULL) {
710            mObjects[mObjectsSize] = mDataPos;
711            acquire_object(ProcessState::self(), val, this);
712            mObjectsSize++;
713        }
714
715        // remember if it's a file descriptor
716        if (val.type == BINDER_TYPE_FD) {
717            mHasFds = mFdsKnown = true;
718        }
719
720        return finishWrite(sizeof(flat_binder_object));
721    }
722
723    if (!enoughData) {
724        const status_t err = growData(sizeof(val));
725        if (err != NO_ERROR) return err;
726    }
727    if (!enoughObjects) {
728        size_t newSize = ((mObjectsSize+2)*3)/2;
729        size_t* objects = (size_t*)realloc(mObjects, newSize*sizeof(size_t));
730        if (objects == NULL) return NO_MEMORY;
731        mObjects = objects;
732        mObjectsCapacity = newSize;
733    }
734
735    goto restart_write;
736}
737
738
739void Parcel::remove(size_t start, size_t amt)
740{
741    LOG_ALWAYS_FATAL("Parcel::remove() not yet implemented!");
742}
743
744status_t Parcel::read(void* outData, size_t len) const
745{
746    if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize) {
747        memcpy(outData, mData+mDataPos, len);
748        mDataPos += PAD_SIZE(len);
749        LOGV("read Setting data pos of %p to %d\n", this, mDataPos);
750        return NO_ERROR;
751    }
752    return NOT_ENOUGH_DATA;
753}
754
755const void* Parcel::readInplace(size_t len) const
756{
757    if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize) {
758        const void* data = mData+mDataPos;
759        mDataPos += PAD_SIZE(len);
760        LOGV("readInplace Setting data pos of %p to %d\n", this, mDataPos);
761        return data;
762    }
763    return NULL;
764}
765
766status_t Parcel::readInt32(int32_t *pArg) const
767{
768    if ((mDataPos+sizeof(int32_t)) <= mDataSize) {
769        const void* data = mData+mDataPos;
770        mDataPos += sizeof(int32_t);
771        *pArg =  *reinterpret_cast<const int32_t*>(data);
772        return NO_ERROR;
773    } else {
774        return NOT_ENOUGH_DATA;
775    }
776}
777
778int32_t Parcel::readInt32() const
779{
780    if ((mDataPos+sizeof(int32_t)) <= mDataSize) {
781        const void* data = mData+mDataPos;
782        mDataPos += sizeof(int32_t);
783        LOGV("readInt32 Setting data pos of %p to %d\n", this, mDataPos);
784        return *reinterpret_cast<const int32_t*>(data);
785    }
786    return 0;
787}
788
789
790status_t Parcel::readInt64(int64_t *pArg) const
791{
792    if ((mDataPos+sizeof(int64_t)) <= mDataSize) {
793        const void* data = mData+mDataPos;
794        mDataPos += sizeof(int64_t);
795        *pArg = *reinterpret_cast<const int64_t*>(data);
796        LOGV("readInt64 Setting data pos of %p to %d\n", this, mDataPos);
797        return NO_ERROR;
798    } else {
799        return NOT_ENOUGH_DATA;
800    }
801}
802
803
804int64_t Parcel::readInt64() const
805{
806    if ((mDataPos+sizeof(int64_t)) <= mDataSize) {
807        const void* data = mData+mDataPos;
808        mDataPos += sizeof(int64_t);
809        LOGV("readInt64 Setting data pos of %p to %d\n", this, mDataPos);
810        return *reinterpret_cast<const int64_t*>(data);
811    }
812    return 0;
813}
814
815status_t Parcel::readFloat(float *pArg) const
816{
817    if ((mDataPos+sizeof(float)) <= mDataSize) {
818        const void* data = mData+mDataPos;
819        mDataPos += sizeof(float);
820        LOGV("readFloat Setting data pos of %p to %d\n", this, mDataPos);
821        *pArg = *reinterpret_cast<const float*>(data);
822        return NO_ERROR;
823    } else {
824        return NOT_ENOUGH_DATA;
825    }
826}
827
828
829float Parcel::readFloat() const
830{
831    if ((mDataPos+sizeof(float)) <= mDataSize) {
832        const void* data = mData+mDataPos;
833        mDataPos += sizeof(float);
834        LOGV("readFloat Setting data pos of %p to %d\n", this, mDataPos);
835        return *reinterpret_cast<const float*>(data);
836    }
837    return 0;
838}
839
840status_t Parcel::readDouble(double *pArg) const
841{
842    if ((mDataPos+sizeof(double)) <= mDataSize) {
843        const void* data = mData+mDataPos;
844        mDataPos += sizeof(double);
845        LOGV("readDouble Setting data pos of %p to %d\n", this, mDataPos);
846        *pArg = *reinterpret_cast<const double*>(data);
847        return NO_ERROR;
848    } else {
849        return NOT_ENOUGH_DATA;
850    }
851}
852
853
854double Parcel::readDouble() const
855{
856    if ((mDataPos+sizeof(double)) <= mDataSize) {
857        const void* data = mData+mDataPos;
858        mDataPos += sizeof(double);
859        LOGV("readDouble Setting data pos of %p to %d\n", this, mDataPos);
860        return *reinterpret_cast<const double*>(data);
861    }
862    return 0;
863}
864
865
866const char* Parcel::readCString() const
867{
868    const size_t avail = mDataSize-mDataPos;
869    if (avail > 0) {
870        const char* str = reinterpret_cast<const char*>(mData+mDataPos);
871        // is the string's trailing NUL within the parcel's valid bounds?
872        const char* eos = reinterpret_cast<const char*>(memchr(str, 0, avail));
873        if (eos) {
874            const size_t len = eos - str;
875            mDataPos += PAD_SIZE(len+1);
876            LOGV("readCString Setting data pos of %p to %d\n", this, mDataPos);
877            return str;
878        }
879    }
880    return NULL;
881}
882
883String8 Parcel::readString8() const
884{
885    int32_t size = readInt32();
886    // watch for potential int overflow adding 1 for trailing NUL
887    if (size > 0 && size < INT32_MAX) {
888        const char* str = (const char*)readInplace(size+1);
889        if (str) return String8(str, size);
890    }
891    return String8();
892}
893
894String16 Parcel::readString16() const
895{
896    size_t len;
897    const char16_t* str = readString16Inplace(&len);
898    if (str) return String16(str, len);
899    LOGE("Reading a NULL string not supported here.");
900    return String16();
901}
902
903const char16_t* Parcel::readString16Inplace(size_t* outLen) const
904{
905    int32_t size = readInt32();
906    // watch for potential int overflow from size+1
907    if (size >= 0 && size < INT32_MAX) {
908        *outLen = size;
909        const char16_t* str = (const char16_t*)readInplace((size+1)*sizeof(char16_t));
910        if (str != NULL) {
911            return str;
912        }
913    }
914    *outLen = 0;
915    return NULL;
916}
917
918sp<IBinder> Parcel::readStrongBinder() const
919{
920    sp<IBinder> val;
921    unflatten_binder(ProcessState::self(), *this, &val);
922    return val;
923}
924
925wp<IBinder> Parcel::readWeakBinder() const
926{
927    wp<IBinder> val;
928    unflatten_binder(ProcessState::self(), *this, &val);
929    return val;
930}
931
932
933native_handle* Parcel::readNativeHandle() const
934{
935    int numFds, numInts;
936    status_t err;
937    err = readInt32(&numFds);
938    if (err != NO_ERROR) return 0;
939    err = readInt32(&numInts);
940    if (err != NO_ERROR) return 0;
941
942    native_handle* h = native_handle_create(numFds, numInts);
943    for (int i=0 ; err==NO_ERROR && i<numFds ; i++) {
944        h->data[i] = dup(readFileDescriptor());
945        if (h->data[i] < 0) err = BAD_VALUE;
946    }
947    err = read(h->data + numFds, sizeof(int)*numInts);
948    if (err != NO_ERROR) {
949        native_handle_close(h);
950        native_handle_delete(h);
951        h = 0;
952    }
953    return h;
954}
955
956
957int Parcel::readFileDescriptor() const
958{
959    const flat_binder_object* flat = readObject(true);
960    if (flat) {
961        switch (flat->type) {
962            case BINDER_TYPE_FD:
963                //LOGI("Returning file descriptor %ld from parcel %p\n", flat->handle, this);
964                return flat->handle;
965        }
966    }
967    return BAD_TYPE;
968}
969
970const flat_binder_object* Parcel::readObject(bool nullMetaData) const
971{
972    const size_t DPOS = mDataPos;
973    if ((DPOS+sizeof(flat_binder_object)) <= mDataSize) {
974        const flat_binder_object* obj
975                = reinterpret_cast<const flat_binder_object*>(mData+DPOS);
976        mDataPos = DPOS + sizeof(flat_binder_object);
977        if (!nullMetaData && (obj->cookie == NULL && obj->binder == NULL)) {
978            // When transferring a NULL object, we don't write it into
979            // the object list, so we don't want to check for it when
980            // reading.
981            LOGV("readObject Setting data pos of %p to %d\n", this, mDataPos);
982            return obj;
983        }
984
985        // Ensure that this object is valid...
986        size_t* const OBJS = mObjects;
987        const size_t N = mObjectsSize;
988        size_t opos = mNextObjectHint;
989
990        if (N > 0) {
991            LOGV("Parcel %p looking for obj at %d, hint=%d\n",
992                 this, DPOS, opos);
993
994            // Start at the current hint position, looking for an object at
995            // the current data position.
996            if (opos < N) {
997                while (opos < (N-1) && OBJS[opos] < DPOS) {
998                    opos++;
999                }
1000            } else {
1001                opos = N-1;
1002            }
1003            if (OBJS[opos] == DPOS) {
1004                // Found it!
1005                LOGV("Parcel found obj %d at index %d with forward search",
1006                     this, DPOS, opos);
1007                mNextObjectHint = opos+1;
1008                LOGV("readObject Setting data pos of %p to %d\n", this, mDataPos);
1009                return obj;
1010            }
1011
1012            // Look backwards for it...
1013            while (opos > 0 && OBJS[opos] > DPOS) {
1014                opos--;
1015            }
1016            if (OBJS[opos] == DPOS) {
1017                // Found it!
1018                LOGV("Parcel found obj %d at index %d with backward 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        LOGW("Attempt to read object from Parcel %p at offset %d that is not in the object list",
1026             this, DPOS);
1027    }
1028    return NULL;
1029}
1030
1031void Parcel::closeFileDescriptors()
1032{
1033    size_t i = mObjectsSize;
1034    if (i > 0) {
1035        //LOGI("Closing file descriptors for %d objects...", mObjectsSize);
1036    }
1037    while (i > 0) {
1038        i--;
1039        const flat_binder_object* flat
1040            = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]);
1041        if (flat->type == BINDER_TYPE_FD) {
1042            //LOGI("Closing fd: %ld\n", flat->handle);
1043            close(flat->handle);
1044        }
1045    }
1046}
1047
1048const uint8_t* Parcel::ipcData() const
1049{
1050    return mData;
1051}
1052
1053size_t Parcel::ipcDataSize() const
1054{
1055    return (mDataSize > mDataPos ? mDataSize : mDataPos);
1056}
1057
1058const size_t* Parcel::ipcObjects() const
1059{
1060    return mObjects;
1061}
1062
1063size_t Parcel::ipcObjectsCount() const
1064{
1065    return mObjectsSize;
1066}
1067
1068void Parcel::ipcSetDataReference(const uint8_t* data, size_t dataSize,
1069    const size_t* objects, size_t objectsCount, release_func relFunc, void* relCookie)
1070{
1071    freeDataNoInit();
1072    mError = NO_ERROR;
1073    mData = const_cast<uint8_t*>(data);
1074    mDataSize = mDataCapacity = dataSize;
1075    //LOGI("setDataReference Setting data size of %p to %lu (pid=%d)\n", this, mDataSize, getpid());
1076    mDataPos = 0;
1077    LOGV("setDataReference Setting data pos of %p to %d\n", this, mDataPos);
1078    mObjects = const_cast<size_t*>(objects);
1079    mObjectsSize = mObjectsCapacity = objectsCount;
1080    mNextObjectHint = 0;
1081    mOwner = relFunc;
1082    mOwnerCookie = relCookie;
1083    scanForFds();
1084}
1085
1086void Parcel::print(TextOutput& to, uint32_t flags) const
1087{
1088    to << "Parcel(";
1089
1090    if (errorCheck() != NO_ERROR) {
1091        const status_t err = errorCheck();
1092        to << "Error: " << (void*)err << " \"" << strerror(-err) << "\"";
1093    } else if (dataSize() > 0) {
1094        const uint8_t* DATA = data();
1095        to << indent << HexDump(DATA, dataSize()) << dedent;
1096        const size_t* OBJS = objects();
1097        const size_t N = objectsCount();
1098        for (size_t i=0; i<N; i++) {
1099            const flat_binder_object* flat
1100                = reinterpret_cast<const flat_binder_object*>(DATA+OBJS[i]);
1101            to << endl << "Object #" << i << " @ " << (void*)OBJS[i] << ": "
1102                << TypeCode(flat->type & 0x7f7f7f00)
1103                << " = " << flat->binder;
1104        }
1105    } else {
1106        to << "NULL";
1107    }
1108
1109    to << ")";
1110}
1111
1112void Parcel::releaseObjects()
1113{
1114    const sp<ProcessState> proc(ProcessState::self());
1115    size_t i = mObjectsSize;
1116    uint8_t* const data = mData;
1117    size_t* const objects = mObjects;
1118    while (i > 0) {
1119        i--;
1120        const flat_binder_object* flat
1121            = reinterpret_cast<flat_binder_object*>(data+objects[i]);
1122        release_object(proc, *flat, this);
1123    }
1124}
1125
1126void Parcel::acquireObjects()
1127{
1128    const sp<ProcessState> proc(ProcessState::self());
1129    size_t i = mObjectsSize;
1130    uint8_t* const data = mData;
1131    size_t* const objects = mObjects;
1132    while (i > 0) {
1133        i--;
1134        const flat_binder_object* flat
1135            = reinterpret_cast<flat_binder_object*>(data+objects[i]);
1136        acquire_object(proc, *flat, this);
1137    }
1138}
1139
1140void Parcel::freeData()
1141{
1142    freeDataNoInit();
1143    initState();
1144}
1145
1146void Parcel::freeDataNoInit()
1147{
1148    if (mOwner) {
1149        //LOGI("Freeing data ref of %p (pid=%d)\n", this, getpid());
1150        mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie);
1151    } else {
1152        releaseObjects();
1153        if (mData) free(mData);
1154        if (mObjects) free(mObjects);
1155    }
1156}
1157
1158status_t Parcel::growData(size_t len)
1159{
1160    size_t newSize = ((mDataSize+len)*3)/2;
1161    return (newSize <= mDataSize)
1162            ? (status_t) NO_MEMORY
1163            : continueWrite(newSize);
1164}
1165
1166status_t Parcel::restartWrite(size_t desired)
1167{
1168    if (mOwner) {
1169        freeData();
1170        return continueWrite(desired);
1171    }
1172
1173    uint8_t* data = (uint8_t*)realloc(mData, desired);
1174    if (!data && desired > mDataCapacity) {
1175        mError = NO_MEMORY;
1176        return NO_MEMORY;
1177    }
1178
1179    releaseObjects();
1180
1181    if (data) {
1182        mData = data;
1183        mDataCapacity = desired;
1184    }
1185
1186    mDataSize = mDataPos = 0;
1187    LOGV("restartWrite Setting data size of %p to %d\n", this, mDataSize);
1188    LOGV("restartWrite Setting data pos of %p to %d\n", this, mDataPos);
1189
1190    free(mObjects);
1191    mObjects = NULL;
1192    mObjectsSize = mObjectsCapacity = 0;
1193    mNextObjectHint = 0;
1194    mHasFds = false;
1195    mFdsKnown = true;
1196
1197    return NO_ERROR;
1198}
1199
1200status_t Parcel::continueWrite(size_t desired)
1201{
1202    // If shrinking, first adjust for any objects that appear
1203    // after the new data size.
1204    size_t objectsSize = mObjectsSize;
1205    if (desired < mDataSize) {
1206        if (desired == 0) {
1207            objectsSize = 0;
1208        } else {
1209            while (objectsSize > 0) {
1210                if (mObjects[objectsSize-1] < desired)
1211                    break;
1212                objectsSize--;
1213            }
1214        }
1215    }
1216
1217    if (mOwner) {
1218        // If the size is going to zero, just release the owner's data.
1219        if (desired == 0) {
1220            freeData();
1221            return NO_ERROR;
1222        }
1223
1224        // If there is a different owner, we need to take
1225        // posession.
1226        uint8_t* data = (uint8_t*)malloc(desired);
1227        if (!data) {
1228            mError = NO_MEMORY;
1229            return NO_MEMORY;
1230        }
1231        size_t* objects = NULL;
1232
1233        if (objectsSize) {
1234            objects = (size_t*)malloc(objectsSize*sizeof(size_t));
1235            if (!objects) {
1236                mError = NO_MEMORY;
1237                return NO_MEMORY;
1238            }
1239
1240            // Little hack to only acquire references on objects
1241            // we will be keeping.
1242            size_t oldObjectsSize = mObjectsSize;
1243            mObjectsSize = objectsSize;
1244            acquireObjects();
1245            mObjectsSize = oldObjectsSize;
1246        }
1247
1248        if (mData) {
1249            memcpy(data, mData, mDataSize < desired ? mDataSize : desired);
1250        }
1251        if (objects && mObjects) {
1252            memcpy(objects, mObjects, objectsSize*sizeof(size_t));
1253        }
1254        //LOGI("Freeing data ref of %p (pid=%d)\n", this, getpid());
1255        mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie);
1256        mOwner = NULL;
1257
1258        mData = data;
1259        mObjects = objects;
1260        mDataSize = (mDataSize < desired) ? mDataSize : desired;
1261        LOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize);
1262        mDataCapacity = desired;
1263        mObjectsSize = mObjectsCapacity = objectsSize;
1264        mNextObjectHint = 0;
1265
1266    } else if (mData) {
1267        if (objectsSize < mObjectsSize) {
1268            // Need to release refs on any objects we are dropping.
1269            const sp<ProcessState> proc(ProcessState::self());
1270            for (size_t i=objectsSize; i<mObjectsSize; i++) {
1271                const flat_binder_object* flat
1272                    = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]);
1273                if (flat->type == BINDER_TYPE_FD) {
1274                    // will need to rescan because we may have lopped off the only FDs
1275                    mFdsKnown = false;
1276                }
1277                release_object(proc, *flat, this);
1278            }
1279            size_t* objects =
1280                (size_t*)realloc(mObjects, objectsSize*sizeof(size_t));
1281            if (objects) {
1282                mObjects = objects;
1283            }
1284            mObjectsSize = objectsSize;
1285            mNextObjectHint = 0;
1286        }
1287
1288        // We own the data, so we can just do a realloc().
1289        if (desired > mDataCapacity) {
1290            uint8_t* data = (uint8_t*)realloc(mData, desired);
1291            if (data) {
1292                mData = data;
1293                mDataCapacity = desired;
1294            } else if (desired > mDataCapacity) {
1295                mError = NO_MEMORY;
1296                return NO_MEMORY;
1297            }
1298        } else {
1299            mDataSize = desired;
1300            LOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize);
1301            if (mDataPos > desired) {
1302                mDataPos = desired;
1303                LOGV("continueWrite Setting data pos of %p to %d\n", this, mDataPos);
1304            }
1305        }
1306
1307    } else {
1308        // This is the first data.  Easy!
1309        uint8_t* data = (uint8_t*)malloc(desired);
1310        if (!data) {
1311            mError = NO_MEMORY;
1312            return NO_MEMORY;
1313        }
1314
1315        if(!(mDataCapacity == 0 && mObjects == NULL
1316             && mObjectsCapacity == 0)) {
1317            LOGE("continueWrite: %d/%p/%d/%d", mDataCapacity, mObjects, mObjectsCapacity, desired);
1318        }
1319
1320        mData = data;
1321        mDataSize = mDataPos = 0;
1322        LOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize);
1323        LOGV("continueWrite Setting data pos of %p to %d\n", this, mDataPos);
1324        mDataCapacity = desired;
1325    }
1326
1327    return NO_ERROR;
1328}
1329
1330void Parcel::initState()
1331{
1332    mError = NO_ERROR;
1333    mData = 0;
1334    mDataSize = 0;
1335    mDataCapacity = 0;
1336    mDataPos = 0;
1337    LOGV("initState Setting data size of %p to %d\n", this, mDataSize);
1338    LOGV("initState Setting data pos of %p to %d\n", this, mDataPos);
1339    mObjects = NULL;
1340    mObjectsSize = 0;
1341    mObjectsCapacity = 0;
1342    mNextObjectHint = 0;
1343    mHasFds = false;
1344    mFdsKnown = true;
1345    mOwner = NULL;
1346}
1347
1348void Parcel::scanForFds() const
1349{
1350    bool hasFds = false;
1351    for (size_t i=0; i<mObjectsSize; i++) {
1352        const flat_binder_object* flat
1353            = reinterpret_cast<const flat_binder_object*>(mData + mObjects[i]);
1354        if (flat->type == BINDER_TYPE_FD) {
1355            hasFds = true;
1356            break;
1357        }
1358    }
1359    mHasFds = hasFds;
1360    mFdsKnown = true;
1361}
1362
1363}; // namespace android
1364