Parcel.cpp revision ec4e0063a1c5cc6e01472cc2a9d27609ce3827d7 
1/*
2 * Copyright (C) 2005 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#define LOG_TAG "Parcel"
18//#define LOG_NDEBUG 0
19
20#include <binder/Parcel.h>
21
22#include <binder/IPCThreadState.h>
23#include <binder/Binder.h>
24#include <binder/BpBinder.h>
25#include <utils/Debug.h>
26#include <binder/ProcessState.h>
27#include <utils/Log.h>
28#include <utils/String8.h>
29#include <utils/String16.h>
30#include <utils/TextOutput.h>
31#include <utils/misc.h>
32#include <utils/Flattenable.h>
33#include <cutils/ashmem.h>
34
35#include <private/binder/binder_module.h>
36
37#include <stdio.h>
38#include <stdlib.h>
39#include <stdint.h>
40#include <sys/mman.h>
41
42#ifndef INT32_MAX
43#define INT32_MAX ((int32_t)(2147483647))
44#endif
45
46#define LOG_REFS(...)
47//#define LOG_REFS(...) LOG(LOG_DEBUG, "Parcel", __VA_ARGS__)
48
49// ---------------------------------------------------------------------------
50
51#define PAD_SIZE(s) (((s)+3)&~3)
52
53// Note: must be kept in sync with android/os/StrictMode.java's PENALTY_GATHER
54#define STRICT_MODE_PENALTY_GATHER 0x100
55
56// Note: must be kept in sync with android/os/Parcel.java's EX_HAS_REPLY_HEADER
57#define EX_HAS_REPLY_HEADER -128
58
59// Maximum size of a blob to transfer in-place.
60static const size_t IN_PLACE_BLOB_LIMIT = 40 * 1024;
61
62// XXX This can be made public if we want to provide
63// support for typed data.
64struct small_flat_data
65{
66    uint32_t type;
67    uint32_t data;
68};
69
70namespace android {
71
72void acquire_object(const sp<ProcessState>& proc,
73    const flat_binder_object& obj, const void* who)
74{
75    switch (obj.type) {
76        case BINDER_TYPE_BINDER:
77            if (obj.binder) {
78                LOG_REFS("Parcel %p acquiring reference on local %p", who, obj.cookie);
79                static_cast<IBinder*>(obj.cookie)->incStrong(who);
80            }
81            return;
82        case BINDER_TYPE_WEAK_BINDER:
83            if (obj.binder)
84                static_cast<RefBase::weakref_type*>(obj.binder)->incWeak(who);
85            return;
86        case BINDER_TYPE_HANDLE: {
87            const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle);
88            if (b != NULL) {
89                LOG_REFS("Parcel %p acquiring reference on remote %p", who, b.get());
90                b->incStrong(who);
91            }
92            return;
93        }
94        case BINDER_TYPE_WEAK_HANDLE: {
95            const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle);
96            if (b != NULL) b.get_refs()->incWeak(who);
97            return;
98        }
99        case BINDER_TYPE_FD: {
100            // intentionally blank -- nothing to do to acquire this, but we do
101            // recognize it as a legitimate object type.
102            return;
103        }
104    }
105
106    LOGD("Invalid object type 0x%08lx", obj.type);
107}
108
109void release_object(const sp<ProcessState>& proc,
110    const flat_binder_object& obj, const void* who)
111{
112    switch (obj.type) {
113        case BINDER_TYPE_BINDER:
114            if (obj.binder) {
115                LOG_REFS("Parcel %p releasing reference on local %p", who, obj.cookie);
116                static_cast<IBinder*>(obj.cookie)->decStrong(who);
117            }
118            return;
119        case BINDER_TYPE_WEAK_BINDER:
120            if (obj.binder)
121                static_cast<RefBase::weakref_type*>(obj.binder)->decWeak(who);
122            return;
123        case BINDER_TYPE_HANDLE: {
124            const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle);
125            if (b != NULL) {
126                LOG_REFS("Parcel %p releasing reference on remote %p", who, b.get());
127                b->decStrong(who);
128            }
129            return;
130        }
131        case BINDER_TYPE_WEAK_HANDLE: {
132            const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle);
133            if (b != NULL) b.get_refs()->decWeak(who);
134            return;
135        }
136        case BINDER_TYPE_FD: {
137            if (obj.cookie != (void*)0) close(obj.handle);
138            return;
139        }
140    }
141
142    LOGE("Invalid object type 0x%08lx", obj.type);
143}
144
145inline static status_t finish_flatten_binder(
146    const sp<IBinder>& binder, const flat_binder_object& flat, Parcel* out)
147{
148    return out->writeObject(flat, false);
149}
150
151status_t flatten_binder(const sp<ProcessState>& proc,
152    const sp<IBinder>& binder, Parcel* out)
153{
154    flat_binder_object obj;
155
156    obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS;
157    if (binder != NULL) {
158        IBinder *local = binder->localBinder();
159        if (!local) {
160            BpBinder *proxy = binder->remoteBinder();
161            if (proxy == NULL) {
162                LOGE("null proxy");
163            }
164            const int32_t handle = proxy ? proxy->handle() : 0;
165            obj.type = BINDER_TYPE_HANDLE;
166            obj.handle = handle;
167            obj.cookie = NULL;
168        } else {
169            obj.type = BINDER_TYPE_BINDER;
170            obj.binder = local->getWeakRefs();
171            obj.cookie = local;
172        }
173    } else {
174        obj.type = BINDER_TYPE_BINDER;
175        obj.binder = NULL;
176        obj.cookie = NULL;
177    }
178
179    return finish_flatten_binder(binder, obj, out);
180}
181
182status_t flatten_binder(const sp<ProcessState>& proc,
183    const wp<IBinder>& binder, Parcel* out)
184{
185    flat_binder_object obj;
186
187    obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS;
188    if (binder != NULL) {
189        sp<IBinder> real = binder.promote();
190        if (real != NULL) {
191            IBinder *local = real->localBinder();
192            if (!local) {
193                BpBinder *proxy = real->remoteBinder();
194                if (proxy == NULL) {
195                    LOGE("null proxy");
196                }
197                const int32_t handle = proxy ? proxy->handle() : 0;
198                obj.type = BINDER_TYPE_WEAK_HANDLE;
199                obj.handle = handle;
200                obj.cookie = NULL;
201            } else {
202                obj.type = BINDER_TYPE_WEAK_BINDER;
203                obj.binder = binder.get_refs();
204                obj.cookie = binder.unsafe_get();
205            }
206            return finish_flatten_binder(real, obj, out);
207        }
208
209        // XXX How to deal?  In order to flatten the given binder,
210        // we need to probe it for information, which requires a primary
211        // reference...  but we don't have one.
212        //
213        // The OpenBinder implementation uses a dynamic_cast<> here,
214        // but we can't do that with the different reference counting
215        // implementation we are using.
216        LOGE("Unable to unflatten Binder weak reference!");
217        obj.type = BINDER_TYPE_BINDER;
218        obj.binder = NULL;
219        obj.cookie = NULL;
220        return finish_flatten_binder(NULL, obj, out);
221
222    } else {
223        obj.type = BINDER_TYPE_BINDER;
224        obj.binder = NULL;
225        obj.cookie = NULL;
226        return finish_flatten_binder(NULL, obj, out);
227    }
228}
229
230inline static status_t finish_unflatten_binder(
231    BpBinder* proxy, const flat_binder_object& flat, const Parcel& in)
232{
233    return NO_ERROR;
234}
235
236status_t unflatten_binder(const sp<ProcessState>& proc,
237    const Parcel& in, sp<IBinder>* out)
238{
239    const flat_binder_object* flat = in.readObject(false);
240
241    if (flat) {
242        switch (flat->type) {
243            case BINDER_TYPE_BINDER:
244                *out = static_cast<IBinder*>(flat->cookie);
245                return finish_unflatten_binder(NULL, *flat, in);
246            case BINDER_TYPE_HANDLE:
247                *out = proc->getStrongProxyForHandle(flat->handle);
248                return finish_unflatten_binder(
249                    static_cast<BpBinder*>(out->get()), *flat, in);
250        }
251    }
252    return BAD_TYPE;
253}
254
255status_t unflatten_binder(const sp<ProcessState>& proc,
256    const Parcel& in, wp<IBinder>* out)
257{
258    const flat_binder_object* flat = in.readObject(false);
259
260    if (flat) {
261        switch (flat->type) {
262            case BINDER_TYPE_BINDER:
263                *out = static_cast<IBinder*>(flat->cookie);
264                return finish_unflatten_binder(NULL, *flat, in);
265            case BINDER_TYPE_WEAK_BINDER:
266                if (flat->binder != NULL) {
267                    out->set_object_and_refs(
268                        static_cast<IBinder*>(flat->cookie),
269                        static_cast<RefBase::weakref_type*>(flat->binder));
270                } else {
271                    *out = NULL;
272                }
273                return finish_unflatten_binder(NULL, *flat, in);
274            case BINDER_TYPE_HANDLE:
275            case BINDER_TYPE_WEAK_HANDLE:
276                *out = proc->getWeakProxyForHandle(flat->handle);
277                return finish_unflatten_binder(
278                    static_cast<BpBinder*>(out->unsafe_get()), *flat, in);
279        }
280    }
281    return BAD_TYPE;
282}
283
284// ---------------------------------------------------------------------------
285
286Parcel::Parcel()
287{
288    initState();
289}
290
291Parcel::~Parcel()
292{
293    freeDataNoInit();
294}
295
296const uint8_t* Parcel::data() const
297{
298    return mData;
299}
300
301size_t Parcel::dataSize() const
302{
303    return (mDataSize > mDataPos ? mDataSize : mDataPos);
304}
305
306size_t Parcel::dataAvail() const
307{
308    // TODO: decide what to do about the possibility that this can
309    // report an available-data size that exceeds a Java int's max
310    // positive value, causing havoc.  Fortunately this will only
311    // happen if someone constructs a Parcel containing more than two
312    // gigabytes of data, which on typical phone hardware is simply
313    // not possible.
314    return dataSize() - dataPosition();
315}
316
317size_t Parcel::dataPosition() const
318{
319    return mDataPos;
320}
321
322size_t Parcel::dataCapacity() const
323{
324    return mDataCapacity;
325}
326
327status_t Parcel::setDataSize(size_t size)
328{
329    status_t err;
330    err = continueWrite(size);
331    if (err == NO_ERROR) {
332        mDataSize = size;
333        LOGV("setDataSize Setting data size of %p to %d\n", this, mDataSize);
334    }
335    return err;
336}
337
338void Parcel::setDataPosition(size_t pos) const
339{
340    mDataPos = pos;
341    mNextObjectHint = 0;
342}
343
344status_t Parcel::setDataCapacity(size_t size)
345{
346    if (size > mDataCapacity) return continueWrite(size);
347    return NO_ERROR;
348}
349
350status_t Parcel::setData(const uint8_t* buffer, size_t len)
351{
352    status_t err = restartWrite(len);
353    if (err == NO_ERROR) {
354        memcpy(const_cast<uint8_t*>(data()), buffer, len);
355        mDataSize = len;
356        mFdsKnown = false;
357    }
358    return err;
359}
360
361status_t Parcel::appendFrom(const Parcel *parcel, size_t offset, size_t len)
362{
363    const sp<ProcessState> proc(ProcessState::self());
364    status_t err;
365    const uint8_t *data = parcel->mData;
366    const size_t *objects = parcel->mObjects;
367    size_t size = parcel->mObjectsSize;
368    int startPos = mDataPos;
369    int firstIndex = -1, lastIndex = -2;
370
371    if (len == 0) {
372        return NO_ERROR;
373    }
374
375    // range checks against the source parcel size
376    if ((offset > parcel->mDataSize)
377            || (len > parcel->mDataSize)
378            || (offset + len > parcel->mDataSize)) {
379        return BAD_VALUE;
380    }
381
382    // Count objects in range
383    for (int i = 0; i < (int) size; i++) {
384        size_t off = objects[i];
385        if ((off >= offset) && (off < offset + len)) {
386            if (firstIndex == -1) {
387                firstIndex = i;
388            }
389            lastIndex = i;
390        }
391    }
392    int numObjects = lastIndex - firstIndex + 1;
393
394    if ((mDataSize+len) > mDataCapacity) {
395        // grow data
396        err = growData(len);
397        if (err != NO_ERROR) {
398            return err;
399        }
400    }
401
402    // append data
403    memcpy(mData + mDataPos, data + offset, len);
404    mDataPos += len;
405    mDataSize += len;
406
407    err = NO_ERROR;
408
409    if (numObjects > 0) {
410        // grow objects
411        if (mObjectsCapacity < mObjectsSize + numObjects) {
412            int newSize = ((mObjectsSize + numObjects)*3)/2;
413            size_t *objects =
414                (size_t*)realloc(mObjects, newSize*sizeof(size_t));
415            if (objects == (size_t*)0) {
416                return NO_MEMORY;
417            }
418            mObjects = objects;
419            mObjectsCapacity = newSize;
420        }
421
422        // append and acquire objects
423        int idx = mObjectsSize;
424        for (int i = firstIndex; i <= lastIndex; i++) {
425            size_t off = objects[i] - offset + startPos;
426            mObjects[idx++] = off;
427            mObjectsSize++;
428
429            flat_binder_object* flat
430                = reinterpret_cast<flat_binder_object*>(mData + off);
431            acquire_object(proc, *flat, this);
432
433            if (flat->type == BINDER_TYPE_FD) {
434                // If this is a file descriptor, we need to dup it so the
435                // new Parcel now owns its own fd, and can declare that we
436                // officially know we have fds.
437                flat->handle = dup(flat->handle);
438                flat->cookie = (void*)1;
439                mHasFds = mFdsKnown = true;
440                if (!mAllowFds) {
441                    err = FDS_NOT_ALLOWED;
442                }
443            }
444        }
445    }
446
447    return err;
448}
449
450bool Parcel::pushAllowFds(bool allowFds)
451{
452    const bool origValue = mAllowFds;
453    if (!allowFds) {
454        mAllowFds = false;
455    }
456    return origValue;
457}
458
459void Parcel::restoreAllowFds(bool lastValue)
460{
461    mAllowFds = lastValue;
462}
463
464bool Parcel::hasFileDescriptors() const
465{
466    if (!mFdsKnown) {
467        scanForFds();
468    }
469    return mHasFds;
470}
471
472// Write RPC headers.  (previously just the interface token)
473status_t Parcel::writeInterfaceToken(const String16& interface)
474{
475    writeInt32(IPCThreadState::self()->getStrictModePolicy() |
476               STRICT_MODE_PENALTY_GATHER);
477    // currently the interface identification token is just its name as a string
478    return writeString16(interface);
479}
480
481bool Parcel::checkInterface(IBinder* binder) const
482{
483    return enforceInterface(binder->getInterfaceDescriptor());
484}
485
486bool Parcel::enforceInterface(const String16& interface,
487                              IPCThreadState* threadState) const
488{
489    int32_t strictPolicy = readInt32();
490    if (threadState == NULL) {
491        threadState = IPCThreadState::self();
492    }
493    if ((threadState->getLastTransactionBinderFlags() &
494         IBinder::FLAG_ONEWAY) != 0) {
495      // For one-way calls, the callee is running entirely
496      // disconnected from the caller, so disable StrictMode entirely.
497      // Not only does disk/network usage not impact the caller, but
498      // there's no way to commuicate back any violations anyway.
499      threadState->setStrictModePolicy(0);
500    } else {
501      threadState->setStrictModePolicy(strictPolicy);
502    }
503    const String16 str(readString16());
504    if (str == interface) {
505        return true;
506    } else {
507        LOGW("**** enforceInterface() expected '%s' but read '%s'\n",
508                String8(interface).string(), String8(str).string());
509        return false;
510    }
511}
512
513const size_t* Parcel::objects() const
514{
515    return mObjects;
516}
517
518size_t Parcel::objectsCount() const
519{
520    return mObjectsSize;
521}
522
523status_t Parcel::errorCheck() const
524{
525    return mError;
526}
527
528void Parcel::setError(status_t err)
529{
530    mError = err;
531}
532
533status_t Parcel::finishWrite(size_t len)
534{
535    //printf("Finish write of %d\n", len);
536    mDataPos += len;
537    LOGV("finishWrite Setting data pos of %p to %d\n", this, mDataPos);
538    if (mDataPos > mDataSize) {
539        mDataSize = mDataPos;
540        LOGV("finishWrite Setting data size of %p to %d\n", this, mDataSize);
541    }
542    //printf("New pos=%d, size=%d\n", mDataPos, mDataSize);
543    return NO_ERROR;
544}
545
546status_t Parcel::writeUnpadded(const void* data, size_t len)
547{
548    size_t end = mDataPos + len;
549    if (end < mDataPos) {
550        // integer overflow
551        return BAD_VALUE;
552    }
553
554    if (end <= mDataCapacity) {
555restart_write:
556        memcpy(mData+mDataPos, data, len);
557        return finishWrite(len);
558    }
559
560    status_t err = growData(len);
561    if (err == NO_ERROR) goto restart_write;
562    return err;
563}
564
565status_t Parcel::write(const void* data, size_t len)
566{
567    void* const d = writeInplace(len);
568    if (d) {
569        memcpy(d, data, len);
570        return NO_ERROR;
571    }
572    return mError;
573}
574
575void* Parcel::writeInplace(size_t len)
576{
577    const size_t padded = PAD_SIZE(len);
578
579    // sanity check for integer overflow
580    if (mDataPos+padded < mDataPos) {
581        return NULL;
582    }
583
584    if ((mDataPos+padded) <= mDataCapacity) {
585restart_write:
586        //printf("Writing %ld bytes, padded to %ld\n", len, padded);
587        uint8_t* const data = mData+mDataPos;
588
589        // Need to pad at end?
590        if (padded != len) {
591#if BYTE_ORDER == BIG_ENDIAN
592            static const uint32_t mask[4] = {
593                0x00000000, 0xffffff00, 0xffff0000, 0xff000000
594            };
595#endif
596#if BYTE_ORDER == LITTLE_ENDIAN
597            static const uint32_t mask[4] = {
598                0x00000000, 0x00ffffff, 0x0000ffff, 0x000000ff
599            };
600#endif
601            //printf("Applying pad mask: %p to %p\n", (void*)mask[padded-len],
602            //    *reinterpret_cast<void**>(data+padded-4));
603            *reinterpret_cast<uint32_t*>(data+padded-4) &= mask[padded-len];
604        }
605
606        finishWrite(padded);
607        return data;
608    }
609
610    status_t err = growData(padded);
611    if (err == NO_ERROR) goto restart_write;
612    return NULL;
613}
614
615status_t Parcel::writeInt32(int32_t val)
616{
617    return writeAligned(val);
618}
619
620status_t Parcel::writeInt64(int64_t val)
621{
622    return writeAligned(val);
623}
624
625status_t Parcel::writeFloat(float val)
626{
627    return writeAligned(val);
628}
629
630status_t Parcel::writeDouble(double val)
631{
632    return writeAligned(val);
633}
634
635status_t Parcel::writeIntPtr(intptr_t val)
636{
637    return writeAligned(val);
638}
639
640status_t Parcel::writeCString(const char* str)
641{
642    return write(str, strlen(str)+1);
643}
644
645status_t Parcel::writeString8(const String8& str)
646{
647    status_t err = writeInt32(str.bytes());
648    // only write string if its length is more than zero characters,
649    // as readString8 will only read if the length field is non-zero.
650    // this is slightly different from how writeString16 works.
651    if (str.bytes() > 0 && err == NO_ERROR) {
652        err = write(str.string(), str.bytes()+1);
653    }
654    return err;
655}
656
657status_t Parcel::writeString16(const String16& str)
658{
659    return writeString16(str.string(), str.size());
660}
661
662status_t Parcel::writeString16(const char16_t* str, size_t len)
663{
664    if (str == NULL) return writeInt32(-1);
665
666    status_t err = writeInt32(len);
667    if (err == NO_ERROR) {
668        len *= sizeof(char16_t);
669        uint8_t* data = (uint8_t*)writeInplace(len+sizeof(char16_t));
670        if (data) {
671            memcpy(data, str, len);
672            *reinterpret_cast<char16_t*>(data+len) = 0;
673            return NO_ERROR;
674        }
675        err = mError;
676    }
677    return err;
678}
679
680status_t Parcel::writeStrongBinder(const sp<IBinder>& val)
681{
682    return flatten_binder(ProcessState::self(), val, this);
683}
684
685status_t Parcel::writeWeakBinder(const wp<IBinder>& val)
686{
687    return flatten_binder(ProcessState::self(), val, this);
688}
689
690status_t Parcel::writeNativeHandle(const native_handle* handle)
691{
692    if (!handle || handle->version != sizeof(native_handle))
693        return BAD_TYPE;
694
695    status_t err;
696    err = writeInt32(handle->numFds);
697    if (err != NO_ERROR) return err;
698
699    err = writeInt32(handle->numInts);
700    if (err != NO_ERROR) return err;
701
702    for (int i=0 ; err==NO_ERROR && i<handle->numFds ; i++)
703        err = writeDupFileDescriptor(handle->data[i]);
704
705    if (err != NO_ERROR) {
706        LOGD("write native handle, write dup fd failed");
707        return err;
708    }
709    err = write(handle->data + handle->numFds, sizeof(int)*handle->numInts);
710    return err;
711}
712
713status_t Parcel::writeFileDescriptor(int fd)
714{
715    flat_binder_object obj;
716    obj.type = BINDER_TYPE_FD;
717    obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS;
718    obj.handle = fd;
719    obj.cookie = (void*)0;
720    return writeObject(obj, true);
721}
722
723status_t Parcel::writeDupFileDescriptor(int fd)
724{
725    flat_binder_object obj;
726    obj.type = BINDER_TYPE_FD;
727    obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS;
728    obj.handle = dup(fd);
729    obj.cookie = (void*)1;
730    return writeObject(obj, true);
731}
732
733status_t Parcel::writeBlob(size_t len, WritableBlob* outBlob)
734{
735    status_t status;
736
737    if (!mAllowFds || len <= IN_PLACE_BLOB_LIMIT) {
738        LOGV("writeBlob: write in place");
739        status = writeInt32(0);
740        if (status) return status;
741
742        void* ptr = writeInplace(len);
743        if (!ptr) return NO_MEMORY;
744
745        outBlob->init(false /*mapped*/, ptr, len);
746        return NO_ERROR;
747    }
748
749    LOGV("writeBlob: write to ashmem");
750    int fd = ashmem_create_region("Parcel Blob", len);
751    if (fd < 0) return NO_MEMORY;
752
753    int result = ashmem_set_prot_region(fd, PROT_READ | PROT_WRITE);
754    if (result < 0) {
755        status = result;
756    } else {
757        void* ptr = ::mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
758        if (ptr == MAP_FAILED) {
759            status = -errno;
760        } else {
761            result = ashmem_set_prot_region(fd, PROT_READ);
762            if (result < 0) {
763                status = result;
764            } else {
765                status = writeInt32(1);
766                if (!status) {
767                    status = writeFileDescriptor(fd);
768                    if (!status) {
769                        outBlob->init(true /*mapped*/, ptr, len);
770                        return NO_ERROR;
771                    }
772                }
773            }
774        }
775        ::munmap(ptr, len);
776    }
777    ::close(fd);
778    return status;
779}
780
781status_t Parcel::write(const Flattenable& val)
782{
783    status_t err;
784
785    // size if needed
786    size_t len = val.getFlattenedSize();
787    size_t fd_count = val.getFdCount();
788
789    err = this->writeInt32(len);
790    if (err) return err;
791
792    err = this->writeInt32(fd_count);
793    if (err) return err;
794
795    // payload
796    void* buf = this->writeInplace(PAD_SIZE(len));
797    if (buf == NULL)
798        return BAD_VALUE;
799
800    int* fds = NULL;
801    if (fd_count) {
802        fds = new int[fd_count];
803    }
804
805    err = val.flatten(buf, len, fds, fd_count);
806    for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) {
807        err = this->writeDupFileDescriptor( fds[i] );
808    }
809
810    if (fd_count) {
811        delete [] fds;
812    }
813
814    return err;
815}
816
817status_t Parcel::writeObject(const flat_binder_object& val, bool nullMetaData)
818{
819    const bool enoughData = (mDataPos+sizeof(val)) <= mDataCapacity;
820    const bool enoughObjects = mObjectsSize < mObjectsCapacity;
821    if (enoughData && enoughObjects) {
822restart_write:
823        *reinterpret_cast<flat_binder_object*>(mData+mDataPos) = val;
824
825        // Need to write meta-data?
826        if (nullMetaData || val.binder != NULL) {
827            mObjects[mObjectsSize] = mDataPos;
828            acquire_object(ProcessState::self(), val, this);
829            mObjectsSize++;
830        }
831
832        // remember if it's a file descriptor
833        if (val.type == BINDER_TYPE_FD) {
834            if (!mAllowFds) {
835                return FDS_NOT_ALLOWED;
836            }
837            mHasFds = mFdsKnown = true;
838        }
839
840        return finishWrite(sizeof(flat_binder_object));
841    }
842
843    if (!enoughData) {
844        const status_t err = growData(sizeof(val));
845        if (err != NO_ERROR) return err;
846    }
847    if (!enoughObjects) {
848        size_t newSize = ((mObjectsSize+2)*3)/2;
849        size_t* objects = (size_t*)realloc(mObjects, newSize*sizeof(size_t));
850        if (objects == NULL) return NO_MEMORY;
851        mObjects = objects;
852        mObjectsCapacity = newSize;
853    }
854
855    goto restart_write;
856}
857
858status_t Parcel::writeNoException()
859{
860    return writeInt32(0);
861}
862
863void Parcel::remove(size_t start, size_t amt)
864{
865    LOG_ALWAYS_FATAL("Parcel::remove() not yet implemented!");
866}
867
868status_t Parcel::read(void* outData, size_t len) const
869{
870    if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize) {
871        memcpy(outData, mData+mDataPos, len);
872        mDataPos += PAD_SIZE(len);
873        LOGV("read Setting data pos of %p to %d\n", this, mDataPos);
874        return NO_ERROR;
875    }
876    return NOT_ENOUGH_DATA;
877}
878
879const void* Parcel::readInplace(size_t len) const
880{
881    if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize) {
882        const void* data = mData+mDataPos;
883        mDataPos += PAD_SIZE(len);
884        LOGV("readInplace Setting data pos of %p to %d\n", this, mDataPos);
885        return data;
886    }
887    return NULL;
888}
889
890template<class T>
891status_t Parcel::readAligned(T *pArg) const {
892    COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE(sizeof(T)) == sizeof(T));
893
894    if ((mDataPos+sizeof(T)) <= mDataSize) {
895        const void* data = mData+mDataPos;
896        mDataPos += sizeof(T);
897        *pArg =  *reinterpret_cast<const T*>(data);
898        return NO_ERROR;
899    } else {
900        return NOT_ENOUGH_DATA;
901    }
902}
903
904template<class T>
905T Parcel::readAligned() const {
906    T result;
907    if (readAligned(&result) != NO_ERROR) {
908        result = 0;
909    }
910
911    return result;
912}
913
914template<class T>
915status_t Parcel::writeAligned(T val) {
916    COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE(sizeof(T)) == sizeof(T));
917
918    if ((mDataPos+sizeof(val)) <= mDataCapacity) {
919restart_write:
920        *reinterpret_cast<T*>(mData+mDataPos) = val;
921        return finishWrite(sizeof(val));
922    }
923
924    status_t err = growData(sizeof(val));
925    if (err == NO_ERROR) goto restart_write;
926    return err;
927}
928
929status_t Parcel::readInt32(int32_t *pArg) const
930{
931    return readAligned(pArg);
932}
933
934int32_t Parcel::readInt32() const
935{
936    return readAligned<int32_t>();
937}
938
939
940status_t Parcel::readInt64(int64_t *pArg) const
941{
942    return readAligned(pArg);
943}
944
945
946int64_t Parcel::readInt64() const
947{
948    return readAligned<int64_t>();
949}
950
951status_t Parcel::readFloat(float *pArg) const
952{
953    return readAligned(pArg);
954}
955
956
957float Parcel::readFloat() const
958{
959    return readAligned<float>();
960}
961
962status_t Parcel::readDouble(double *pArg) const
963{
964    return readAligned(pArg);
965}
966
967
968double Parcel::readDouble() const
969{
970    return readAligned<double>();
971}
972
973status_t Parcel::readIntPtr(intptr_t *pArg) const
974{
975    return readAligned(pArg);
976}
977
978
979intptr_t Parcel::readIntPtr() const
980{
981    return readAligned<intptr_t>();
982}
983
984
985const char* Parcel::readCString() const
986{
987    const size_t avail = mDataSize-mDataPos;
988    if (avail > 0) {
989        const char* str = reinterpret_cast<const char*>(mData+mDataPos);
990        // is the string's trailing NUL within the parcel's valid bounds?
991        const char* eos = reinterpret_cast<const char*>(memchr(str, 0, avail));
992        if (eos) {
993            const size_t len = eos - str;
994            mDataPos += PAD_SIZE(len+1);
995            LOGV("readCString Setting data pos of %p to %d\n", this, mDataPos);
996            return str;
997        }
998    }
999    return NULL;
1000}
1001
1002String8 Parcel::readString8() const
1003{
1004    int32_t size = readInt32();
1005    // watch for potential int overflow adding 1 for trailing NUL
1006    if (size > 0 && size < INT32_MAX) {
1007        const char* str = (const char*)readInplace(size+1);
1008        if (str) return String8(str, size);
1009    }
1010    return String8();
1011}
1012
1013String16 Parcel::readString16() const
1014{
1015    size_t len;
1016    const char16_t* str = readString16Inplace(&len);
1017    if (str) return String16(str, len);
1018    LOGE("Reading a NULL string not supported here.");
1019    return String16();
1020}
1021
1022const char16_t* Parcel::readString16Inplace(size_t* outLen) const
1023{
1024    int32_t size = readInt32();
1025    // watch for potential int overflow from size+1
1026    if (size >= 0 && size < INT32_MAX) {
1027        *outLen = size;
1028        const char16_t* str = (const char16_t*)readInplace((size+1)*sizeof(char16_t));
1029        if (str != NULL) {
1030            return str;
1031        }
1032    }
1033    *outLen = 0;
1034    return NULL;
1035}
1036
1037sp<IBinder> Parcel::readStrongBinder() const
1038{
1039    sp<IBinder> val;
1040    unflatten_binder(ProcessState::self(), *this, &val);
1041    return val;
1042}
1043
1044wp<IBinder> Parcel::readWeakBinder() const
1045{
1046    wp<IBinder> val;
1047    unflatten_binder(ProcessState::self(), *this, &val);
1048    return val;
1049}
1050
1051int32_t Parcel::readExceptionCode() const
1052{
1053  int32_t exception_code = readAligned<int32_t>();
1054  if (exception_code == EX_HAS_REPLY_HEADER) {
1055    int32_t header_size = readAligned<int32_t>();
1056    // Skip over fat responses headers.  Not used (or propagated) in
1057    // native code
1058    setDataPosition(dataPosition() + header_size);
1059    // And fat response headers are currently only used when there are no
1060    // exceptions, so return no error:
1061    return 0;
1062  }
1063  return exception_code;
1064}
1065
1066native_handle* Parcel::readNativeHandle() const
1067{
1068    int numFds, numInts;
1069    status_t err;
1070    err = readInt32(&numFds);
1071    if (err != NO_ERROR) return 0;
1072    err = readInt32(&numInts);
1073    if (err != NO_ERROR) return 0;
1074
1075    native_handle* h = native_handle_create(numFds, numInts);
1076    for (int i=0 ; err==NO_ERROR && i<numFds ; i++) {
1077        h->data[i] = dup(readFileDescriptor());
1078        if (h->data[i] < 0) err = BAD_VALUE;
1079    }
1080    err = read(h->data + numFds, sizeof(int)*numInts);
1081    if (err != NO_ERROR) {
1082        native_handle_close(h);
1083        native_handle_delete(h);
1084        h = 0;
1085    }
1086    return h;
1087}
1088
1089
1090int Parcel::readFileDescriptor() const
1091{
1092    const flat_binder_object* flat = readObject(true);
1093    if (flat) {
1094        switch (flat->type) {
1095            case BINDER_TYPE_FD:
1096                //LOGI("Returning file descriptor %ld from parcel %p\n", flat->handle, this);
1097                return flat->handle;
1098        }
1099    }
1100    return BAD_TYPE;
1101}
1102
1103status_t Parcel::readBlob(size_t len, ReadableBlob* outBlob) const
1104{
1105    int32_t useAshmem;
1106    status_t status = readInt32(&useAshmem);
1107    if (status) return status;
1108
1109    if (!useAshmem) {
1110        LOGV("readBlob: read in place");
1111        const void* ptr = readInplace(len);
1112        if (!ptr) return BAD_VALUE;
1113
1114        outBlob->init(false /*mapped*/, const_cast<void*>(ptr), len);
1115        return NO_ERROR;
1116    }
1117
1118    LOGV("readBlob: read from ashmem");
1119    int fd = readFileDescriptor();
1120    if (fd == int(BAD_TYPE)) return BAD_VALUE;
1121
1122    void* ptr = ::mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0);
1123    if (!ptr) return NO_MEMORY;
1124
1125    outBlob->init(true /*mapped*/, ptr, len);
1126    return NO_ERROR;
1127}
1128
1129status_t Parcel::read(Flattenable& val) const
1130{
1131    // size
1132    const size_t len = this->readInt32();
1133    const size_t fd_count = this->readInt32();
1134
1135    // payload
1136    void const* buf = this->readInplace(PAD_SIZE(len));
1137    if (buf == NULL)
1138        return BAD_VALUE;
1139
1140    int* fds = NULL;
1141    if (fd_count) {
1142        fds = new int[fd_count];
1143    }
1144
1145    status_t err = NO_ERROR;
1146    for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) {
1147        fds[i] = dup(this->readFileDescriptor());
1148        if (fds[i] < 0) err = BAD_VALUE;
1149    }
1150
1151    if (err == NO_ERROR) {
1152        err = val.unflatten(buf, len, fds, fd_count);
1153    }
1154
1155    if (fd_count) {
1156        delete [] fds;
1157    }
1158
1159    return err;
1160}
1161const flat_binder_object* Parcel::readObject(bool nullMetaData) const
1162{
1163    const size_t DPOS = mDataPos;
1164    if ((DPOS+sizeof(flat_binder_object)) <= mDataSize) {
1165        const flat_binder_object* obj
1166                = reinterpret_cast<const flat_binder_object*>(mData+DPOS);
1167        mDataPos = DPOS + sizeof(flat_binder_object);
1168        if (!nullMetaData && (obj->cookie == NULL && obj->binder == NULL)) {
1169            // When transferring a NULL object, we don't write it into
1170            // the object list, so we don't want to check for it when
1171            // reading.
1172            LOGV("readObject Setting data pos of %p to %d\n", this, mDataPos);
1173            return obj;
1174        }
1175
1176        // Ensure that this object is valid...
1177        size_t* const OBJS = mObjects;
1178        const size_t N = mObjectsSize;
1179        size_t opos = mNextObjectHint;
1180
1181        if (N > 0) {
1182            LOGV("Parcel %p looking for obj at %d, hint=%d\n",
1183                 this, DPOS, opos);
1184
1185            // Start at the current hint position, looking for an object at
1186            // the current data position.
1187            if (opos < N) {
1188                while (opos < (N-1) && OBJS[opos] < DPOS) {
1189                    opos++;
1190                }
1191            } else {
1192                opos = N-1;
1193            }
1194            if (OBJS[opos] == DPOS) {
1195                // Found it!
1196                LOGV("Parcel found obj %d at index %d with forward search",
1197                     this, DPOS, opos);
1198                mNextObjectHint = opos+1;
1199                LOGV("readObject Setting data pos of %p to %d\n", this, mDataPos);
1200                return obj;
1201            }
1202
1203            // Look backwards for it...
1204            while (opos > 0 && OBJS[opos] > DPOS) {
1205                opos--;
1206            }
1207            if (OBJS[opos] == DPOS) {
1208                // Found it!
1209                LOGV("Parcel found obj %d at index %d with backward search",
1210                     this, DPOS, opos);
1211                mNextObjectHint = opos+1;
1212                LOGV("readObject Setting data pos of %p to %d\n", this, mDataPos);
1213                return obj;
1214            }
1215        }
1216        LOGW("Attempt to read object from Parcel %p at offset %d that is not in the object list",
1217             this, DPOS);
1218    }
1219    return NULL;
1220}
1221
1222void Parcel::closeFileDescriptors()
1223{
1224    size_t i = mObjectsSize;
1225    if (i > 0) {
1226        //LOGI("Closing file descriptors for %d objects...", mObjectsSize);
1227    }
1228    while (i > 0) {
1229        i--;
1230        const flat_binder_object* flat
1231            = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]);
1232        if (flat->type == BINDER_TYPE_FD) {
1233            //LOGI("Closing fd: %ld\n", flat->handle);
1234            close(flat->handle);
1235        }
1236    }
1237}
1238
1239const uint8_t* Parcel::ipcData() const
1240{
1241    return mData;
1242}
1243
1244size_t Parcel::ipcDataSize() const
1245{
1246    return (mDataSize > mDataPos ? mDataSize : mDataPos);
1247}
1248
1249const size_t* Parcel::ipcObjects() const
1250{
1251    return mObjects;
1252}
1253
1254size_t Parcel::ipcObjectsCount() const
1255{
1256    return mObjectsSize;
1257}
1258
1259void Parcel::ipcSetDataReference(const uint8_t* data, size_t dataSize,
1260    const size_t* objects, size_t objectsCount, release_func relFunc, void* relCookie)
1261{
1262    freeDataNoInit();
1263    mError = NO_ERROR;
1264    mData = const_cast<uint8_t*>(data);
1265    mDataSize = mDataCapacity = dataSize;
1266    //LOGI("setDataReference Setting data size of %p to %lu (pid=%d)\n", this, mDataSize, getpid());
1267    mDataPos = 0;
1268    LOGV("setDataReference Setting data pos of %p to %d\n", this, mDataPos);
1269    mObjects = const_cast<size_t*>(objects);
1270    mObjectsSize = mObjectsCapacity = objectsCount;
1271    mNextObjectHint = 0;
1272    mOwner = relFunc;
1273    mOwnerCookie = relCookie;
1274    scanForFds();
1275}
1276
1277void Parcel::print(TextOutput& to, uint32_t flags) const
1278{
1279    to << "Parcel(";
1280
1281    if (errorCheck() != NO_ERROR) {
1282        const status_t err = errorCheck();
1283        to << "Error: " << (void*)err << " \"" << strerror(-err) << "\"";
1284    } else if (dataSize() > 0) {
1285        const uint8_t* DATA = data();
1286        to << indent << HexDump(DATA, dataSize()) << dedent;
1287        const size_t* OBJS = objects();
1288        const size_t N = objectsCount();
1289        for (size_t i=0; i<N; i++) {
1290            const flat_binder_object* flat
1291                = reinterpret_cast<const flat_binder_object*>(DATA+OBJS[i]);
1292            to << endl << "Object #" << i << " @ " << (void*)OBJS[i] << ": "
1293                << TypeCode(flat->type & 0x7f7f7f00)
1294                << " = " << flat->binder;
1295        }
1296    } else {
1297        to << "NULL";
1298    }
1299
1300    to << ")";
1301}
1302
1303void Parcel::releaseObjects()
1304{
1305    const sp<ProcessState> proc(ProcessState::self());
1306    size_t i = mObjectsSize;
1307    uint8_t* const data = mData;
1308    size_t* const objects = mObjects;
1309    while (i > 0) {
1310        i--;
1311        const flat_binder_object* flat
1312            = reinterpret_cast<flat_binder_object*>(data+objects[i]);
1313        release_object(proc, *flat, this);
1314    }
1315}
1316
1317void Parcel::acquireObjects()
1318{
1319    const sp<ProcessState> proc(ProcessState::self());
1320    size_t i = mObjectsSize;
1321    uint8_t* const data = mData;
1322    size_t* const objects = mObjects;
1323    while (i > 0) {
1324        i--;
1325        const flat_binder_object* flat
1326            = reinterpret_cast<flat_binder_object*>(data+objects[i]);
1327        acquire_object(proc, *flat, this);
1328    }
1329}
1330
1331void Parcel::freeData()
1332{
1333    freeDataNoInit();
1334    initState();
1335}
1336
1337void Parcel::freeDataNoInit()
1338{
1339    if (mOwner) {
1340        //LOGI("Freeing data ref of %p (pid=%d)\n", this, getpid());
1341        mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie);
1342    } else {
1343        releaseObjects();
1344        if (mData) free(mData);
1345        if (mObjects) free(mObjects);
1346    }
1347}
1348
1349status_t Parcel::growData(size_t len)
1350{
1351    size_t newSize = ((mDataSize+len)*3)/2;
1352    return (newSize <= mDataSize)
1353            ? (status_t) NO_MEMORY
1354            : continueWrite(newSize);
1355}
1356
1357status_t Parcel::restartWrite(size_t desired)
1358{
1359    if (mOwner) {
1360        freeData();
1361        return continueWrite(desired);
1362    }
1363
1364    uint8_t* data = (uint8_t*)realloc(mData, desired);
1365    if (!data && desired > mDataCapacity) {
1366        mError = NO_MEMORY;
1367        return NO_MEMORY;
1368    }
1369
1370    releaseObjects();
1371
1372    if (data) {
1373        mData = data;
1374        mDataCapacity = desired;
1375    }
1376
1377    mDataSize = mDataPos = 0;
1378    LOGV("restartWrite Setting data size of %p to %d\n", this, mDataSize);
1379    LOGV("restartWrite Setting data pos of %p to %d\n", this, mDataPos);
1380
1381    free(mObjects);
1382    mObjects = NULL;
1383    mObjectsSize = mObjectsCapacity = 0;
1384    mNextObjectHint = 0;
1385    mHasFds = false;
1386    mFdsKnown = true;
1387    mAllowFds = true;
1388
1389    return NO_ERROR;
1390}
1391
1392status_t Parcel::continueWrite(size_t desired)
1393{
1394    // If shrinking, first adjust for any objects that appear
1395    // after the new data size.
1396    size_t objectsSize = mObjectsSize;
1397    if (desired < mDataSize) {
1398        if (desired == 0) {
1399            objectsSize = 0;
1400        } else {
1401            while (objectsSize > 0) {
1402                if (mObjects[objectsSize-1] < desired)
1403                    break;
1404                objectsSize--;
1405            }
1406        }
1407    }
1408
1409    if (mOwner) {
1410        // If the size is going to zero, just release the owner's data.
1411        if (desired == 0) {
1412            freeData();
1413            return NO_ERROR;
1414        }
1415
1416        // If there is a different owner, we need to take
1417        // posession.
1418        uint8_t* data = (uint8_t*)malloc(desired);
1419        if (!data) {
1420            mError = NO_MEMORY;
1421            return NO_MEMORY;
1422        }
1423        size_t* objects = NULL;
1424
1425        if (objectsSize) {
1426            objects = (size_t*)malloc(objectsSize*sizeof(size_t));
1427            if (!objects) {
1428                mError = NO_MEMORY;
1429                return NO_MEMORY;
1430            }
1431
1432            // Little hack to only acquire references on objects
1433            // we will be keeping.
1434            size_t oldObjectsSize = mObjectsSize;
1435            mObjectsSize = objectsSize;
1436            acquireObjects();
1437            mObjectsSize = oldObjectsSize;
1438        }
1439
1440        if (mData) {
1441            memcpy(data, mData, mDataSize < desired ? mDataSize : desired);
1442        }
1443        if (objects && mObjects) {
1444            memcpy(objects, mObjects, objectsSize*sizeof(size_t));
1445        }
1446        //LOGI("Freeing data ref of %p (pid=%d)\n", this, getpid());
1447        mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie);
1448        mOwner = NULL;
1449
1450        mData = data;
1451        mObjects = objects;
1452        mDataSize = (mDataSize < desired) ? mDataSize : desired;
1453        LOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize);
1454        mDataCapacity = desired;
1455        mObjectsSize = mObjectsCapacity = objectsSize;
1456        mNextObjectHint = 0;
1457
1458    } else if (mData) {
1459        if (objectsSize < mObjectsSize) {
1460            // Need to release refs on any objects we are dropping.
1461            const sp<ProcessState> proc(ProcessState::self());
1462            for (size_t i=objectsSize; i<mObjectsSize; i++) {
1463                const flat_binder_object* flat
1464                    = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]);
1465                if (flat->type == BINDER_TYPE_FD) {
1466                    // will need to rescan because we may have lopped off the only FDs
1467                    mFdsKnown = false;
1468                }
1469                release_object(proc, *flat, this);
1470            }
1471            size_t* objects =
1472                (size_t*)realloc(mObjects, objectsSize*sizeof(size_t));
1473            if (objects) {
1474                mObjects = objects;
1475            }
1476            mObjectsSize = objectsSize;
1477            mNextObjectHint = 0;
1478        }
1479
1480        // We own the data, so we can just do a realloc().
1481        if (desired > mDataCapacity) {
1482            uint8_t* data = (uint8_t*)realloc(mData, desired);
1483            if (data) {
1484                mData = data;
1485                mDataCapacity = desired;
1486            } else if (desired > mDataCapacity) {
1487                mError = NO_MEMORY;
1488                return NO_MEMORY;
1489            }
1490        } else {
1491            if (mDataSize > desired) {
1492                mDataSize = desired;
1493                LOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize);
1494            }
1495            if (mDataPos > desired) {
1496                mDataPos = desired;
1497                LOGV("continueWrite Setting data pos of %p to %d\n", this, mDataPos);
1498            }
1499        }
1500
1501    } else {
1502        // This is the first data.  Easy!
1503        uint8_t* data = (uint8_t*)malloc(desired);
1504        if (!data) {
1505            mError = NO_MEMORY;
1506            return NO_MEMORY;
1507        }
1508
1509        if(!(mDataCapacity == 0 && mObjects == NULL
1510             && mObjectsCapacity == 0)) {
1511            LOGE("continueWrite: %d/%p/%d/%d", mDataCapacity, mObjects, mObjectsCapacity, desired);
1512        }
1513
1514        mData = data;
1515        mDataSize = mDataPos = 0;
1516        LOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize);
1517        LOGV("continueWrite Setting data pos of %p to %d\n", this, mDataPos);
1518        mDataCapacity = desired;
1519    }
1520
1521    return NO_ERROR;
1522}
1523
1524void Parcel::initState()
1525{
1526    mError = NO_ERROR;
1527    mData = 0;
1528    mDataSize = 0;
1529    mDataCapacity = 0;
1530    mDataPos = 0;
1531    LOGV("initState Setting data size of %p to %d\n", this, mDataSize);
1532    LOGV("initState Setting data pos of %p to %d\n", this, mDataPos);
1533    mObjects = NULL;
1534    mObjectsSize = 0;
1535    mObjectsCapacity = 0;
1536    mNextObjectHint = 0;
1537    mHasFds = false;
1538    mFdsKnown = true;
1539    mAllowFds = true;
1540    mOwner = NULL;
1541}
1542
1543void Parcel::scanForFds() const
1544{
1545    bool hasFds = false;
1546    for (size_t i=0; i<mObjectsSize; i++) {
1547        const flat_binder_object* flat
1548            = reinterpret_cast<const flat_binder_object*>(mData + mObjects[i]);
1549        if (flat->type == BINDER_TYPE_FD) {
1550            hasFds = true;
1551            break;
1552        }
1553    }
1554    mHasFds = hasFds;
1555    mFdsKnown = true;
1556}
1557
1558// --- Parcel::Blob ---
1559
1560Parcel::Blob::Blob() :
1561        mMapped(false), mData(NULL), mSize(0) {
1562}
1563
1564Parcel::Blob::~Blob() {
1565    release();
1566}
1567
1568void Parcel::Blob::release() {
1569    if (mMapped && mData) {
1570        ::munmap(mData, mSize);
1571    }
1572    clear();
1573}
1574
1575void Parcel::Blob::init(bool mapped, void* data, size_t size) {
1576    mMapped = mapped;
1577    mData = data;
1578    mSize = size;
1579}
1580
1581void Parcel::Blob::clear() {
1582    mMapped = false;
1583    mData = NULL;
1584    mSize = 0;
1585}
1586
1587}; // namespace android
1588