Parcel.cpp revision 5febeff15f71f3826b91a51990c901746f97e950 
1/*
2 * Copyright (C) 2005 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#define LOG_TAG "Parcel"
18//#define LOG_NDEBUG 0
19
20#include <binder/Parcel.h>
21
22#include <binder/IPCThreadState.h>
23#include <binder/Binder.h>
24#include <binder/BpBinder.h>
25#include <binder/ProcessState.h>
26#include <binder/TextOutput.h>
27
28#include <utils/Debug.h>
29#include <utils/Log.h>
30#include <utils/String8.h>
31#include <utils/String16.h>
32#include <utils/misc.h>
33#include <utils/Flattenable.h>
34#include <cutils/ashmem.h>
35
36#include <private/binder/binder_module.h>
37
38#include <inttypes.h>
39#include <stdio.h>
40#include <stdlib.h>
41#include <stdint.h>
42#include <sys/mman.h>
43
44#ifndef INT32_MAX
45#define INT32_MAX ((int32_t)(2147483647))
46#endif
47
48#define LOG_REFS(...)
49//#define LOG_REFS(...) ALOG(LOG_DEBUG, "Parcel", __VA_ARGS__)
50
51// ---------------------------------------------------------------------------
52
53#define PAD_SIZE(s) (((s)+3)&~3)
54
55// Note: must be kept in sync with android/os/StrictMode.java's PENALTY_GATHER
56#define STRICT_MODE_PENALTY_GATHER 0x100
57
58// Note: must be kept in sync with android/os/Parcel.java's EX_HAS_REPLY_HEADER
59#define EX_HAS_REPLY_HEADER -128
60
61// Maximum size of a blob to transfer in-place.
62static const size_t IN_PLACE_BLOB_LIMIT = 40 * 1024;
63
64// XXX This can be made public if we want to provide
65// support for typed data.
66struct small_flat_data
67{
68    uint32_t type;
69    uint32_t data;
70};
71
72namespace android {
73
74void acquire_object(const sp<ProcessState>& proc,
75    const flat_binder_object& obj, const void* who)
76{
77    switch (obj.type) {
78        case BINDER_TYPE_BINDER:
79            if (obj.binder) {
80                LOG_REFS("Parcel %p acquiring reference on local %p", who, obj.cookie);
81                reinterpret_cast<IBinder*>(obj.cookie)->incStrong(who);
82            }
83            return;
84        case BINDER_TYPE_WEAK_BINDER:
85            if (obj.binder)
86                reinterpret_cast<RefBase::weakref_type*>(obj.binder)->incWeak(who);
87            return;
88        case BINDER_TYPE_HANDLE: {
89            const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle);
90            if (b != NULL) {
91                LOG_REFS("Parcel %p acquiring reference on remote %p", who, b.get());
92                b->incStrong(who);
93            }
94            return;
95        }
96        case BINDER_TYPE_WEAK_HANDLE: {
97            const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle);
98            if (b != NULL) b.get_refs()->incWeak(who);
99            return;
100        }
101        case BINDER_TYPE_FD: {
102            // intentionally blank -- nothing to do to acquire this, but we do
103            // recognize it as a legitimate object type.
104            return;
105        }
106    }
107
108    ALOGD("Invalid object type 0x%08x", obj.type);
109}
110
111void release_object(const sp<ProcessState>& proc,
112    const flat_binder_object& obj, const void* who)
113{
114    switch (obj.type) {
115        case BINDER_TYPE_BINDER:
116            if (obj.binder) {
117                LOG_REFS("Parcel %p releasing reference on local %p", who, obj.cookie);
118                reinterpret_cast<IBinder*>(obj.cookie)->decStrong(who);
119            }
120            return;
121        case BINDER_TYPE_WEAK_BINDER:
122            if (obj.binder)
123                reinterpret_cast<RefBase::weakref_type*>(obj.binder)->decWeak(who);
124            return;
125        case BINDER_TYPE_HANDLE: {
126            const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle);
127            if (b != NULL) {
128                LOG_REFS("Parcel %p releasing reference on remote %p", who, b.get());
129                b->decStrong(who);
130            }
131            return;
132        }
133        case BINDER_TYPE_WEAK_HANDLE: {
134            const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle);
135            if (b != NULL) b.get_refs()->decWeak(who);
136            return;
137        }
138        case BINDER_TYPE_FD: {
139            if (obj.cookie != 0) close(obj.handle);
140            return;
141        }
142    }
143
144    ALOGE("Invalid object type 0x%08x", obj.type);
145}
146
147inline static status_t finish_flatten_binder(
148    const sp<IBinder>& /*binder*/, const flat_binder_object& flat, Parcel* out)
149{
150    return out->writeObject(flat, false);
151}
152
153status_t flatten_binder(const sp<ProcessState>& /*proc*/,
154    const sp<IBinder>& binder, Parcel* out)
155{
156    flat_binder_object obj;
157
158    obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS;
159    if (binder != NULL) {
160        IBinder *local = binder->localBinder();
161        if (!local) {
162            BpBinder *proxy = binder->remoteBinder();
163            if (proxy == NULL) {
164                ALOGE("null proxy");
165            }
166            const int32_t handle = proxy ? proxy->handle() : 0;
167            obj.type = BINDER_TYPE_HANDLE;
168            obj.handle = handle;
169            obj.cookie = 0;
170        } else {
171            obj.type = BINDER_TYPE_BINDER;
172            obj.binder = reinterpret_cast<uintptr_t>(local->getWeakRefs());
173            obj.cookie = reinterpret_cast<uintptr_t>(local);
174        }
175    } else {
176        obj.type = BINDER_TYPE_BINDER;
177        obj.binder = 0;
178        obj.cookie = 0;
179    }
180
181    return finish_flatten_binder(binder, obj, out);
182}
183
184status_t flatten_binder(const sp<ProcessState>& /*proc*/,
185    const wp<IBinder>& binder, Parcel* out)
186{
187    flat_binder_object obj;
188
189    obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS;
190    if (binder != NULL) {
191        sp<IBinder> real = binder.promote();
192        if (real != NULL) {
193            IBinder *local = real->localBinder();
194            if (!local) {
195                BpBinder *proxy = real->remoteBinder();
196                if (proxy == NULL) {
197                    ALOGE("null proxy");
198                }
199                const int32_t handle = proxy ? proxy->handle() : 0;
200                obj.type = BINDER_TYPE_WEAK_HANDLE;
201                obj.handle = handle;
202                obj.cookie = 0;
203            } else {
204                obj.type = BINDER_TYPE_WEAK_BINDER;
205                obj.binder = reinterpret_cast<uintptr_t>(binder.get_refs());
206                obj.cookie = reinterpret_cast<uintptr_t>(binder.unsafe_get());
207            }
208            return finish_flatten_binder(real, obj, out);
209        }
210
211        // XXX How to deal?  In order to flatten the given binder,
212        // we need to probe it for information, which requires a primary
213        // reference...  but we don't have one.
214        //
215        // The OpenBinder implementation uses a dynamic_cast<> here,
216        // but we can't do that with the different reference counting
217        // implementation we are using.
218        ALOGE("Unable to unflatten Binder weak reference!");
219        obj.type = BINDER_TYPE_BINDER;
220        obj.binder = 0;
221        obj.cookie = 0;
222        return finish_flatten_binder(NULL, obj, out);
223
224    } else {
225        obj.type = BINDER_TYPE_BINDER;
226        obj.binder = 0;
227        obj.cookie = 0;
228        return finish_flatten_binder(NULL, obj, out);
229    }
230}
231
232inline static status_t finish_unflatten_binder(
233    BpBinder* /*proxy*/, const flat_binder_object& /*flat*/,
234    const Parcel& /*in*/)
235{
236    return NO_ERROR;
237}
238
239status_t unflatten_binder(const sp<ProcessState>& proc,
240    const Parcel& in, sp<IBinder>* out)
241{
242    const flat_binder_object* flat = in.readObject(false);
243
244    if (flat) {
245        switch (flat->type) {
246            case BINDER_TYPE_BINDER:
247                *out = reinterpret_cast<IBinder*>(flat->cookie);
248                return finish_unflatten_binder(NULL, *flat, in);
249            case BINDER_TYPE_HANDLE:
250                *out = proc->getStrongProxyForHandle(flat->handle);
251                return finish_unflatten_binder(
252                    static_cast<BpBinder*>(out->get()), *flat, in);
253        }
254    }
255    return BAD_TYPE;
256}
257
258status_t unflatten_binder(const sp<ProcessState>& proc,
259    const Parcel& in, wp<IBinder>* out)
260{
261    const flat_binder_object* flat = in.readObject(false);
262
263    if (flat) {
264        switch (flat->type) {
265            case BINDER_TYPE_BINDER:
266                *out = reinterpret_cast<IBinder*>(flat->cookie);
267                return finish_unflatten_binder(NULL, *flat, in);
268            case BINDER_TYPE_WEAK_BINDER:
269                if (flat->binder != 0) {
270                    out->set_object_and_refs(
271                        reinterpret_cast<IBinder*>(flat->cookie),
272                        reinterpret_cast<RefBase::weakref_type*>(flat->binder));
273                } else {
274                    *out = NULL;
275                }
276                return finish_unflatten_binder(NULL, *flat, in);
277            case BINDER_TYPE_HANDLE:
278            case BINDER_TYPE_WEAK_HANDLE:
279                *out = proc->getWeakProxyForHandle(flat->handle);
280                return finish_unflatten_binder(
281                    static_cast<BpBinder*>(out->unsafe_get()), *flat, in);
282        }
283    }
284    return BAD_TYPE;
285}
286
287// ---------------------------------------------------------------------------
288
289Parcel::Parcel()
290{
291    initState();
292}
293
294Parcel::~Parcel()
295{
296    freeDataNoInit();
297}
298
299const uint8_t* Parcel::data() const
300{
301    return mData;
302}
303
304size_t Parcel::dataSize() const
305{
306    return (mDataSize > mDataPos ? mDataSize : mDataPos);
307}
308
309size_t Parcel::dataAvail() const
310{
311    // TODO: decide what to do about the possibility that this can
312    // report an available-data size that exceeds a Java int's max
313    // positive value, causing havoc.  Fortunately this will only
314    // happen if someone constructs a Parcel containing more than two
315    // gigabytes of data, which on typical phone hardware is simply
316    // not possible.
317    return dataSize() - dataPosition();
318}
319
320size_t Parcel::dataPosition() const
321{
322    return mDataPos;
323}
324
325size_t Parcel::dataCapacity() const
326{
327    return mDataCapacity;
328}
329
330status_t Parcel::setDataSize(size_t size)
331{
332    status_t err;
333    err = continueWrite(size);
334    if (err == NO_ERROR) {
335        mDataSize = size;
336        ALOGV("setDataSize Setting data size of %p to %d\n", this, mDataSize);
337    }
338    return err;
339}
340
341void Parcel::setDataPosition(size_t pos) const
342{
343    mDataPos = pos;
344    mNextObjectHint = 0;
345}
346
347status_t Parcel::setDataCapacity(size_t size)
348{
349    if (size > mDataCapacity) return continueWrite(size);
350    return NO_ERROR;
351}
352
353status_t Parcel::setData(const uint8_t* buffer, size_t len)
354{
355    status_t err = restartWrite(len);
356    if (err == NO_ERROR) {
357        memcpy(const_cast<uint8_t*>(data()), buffer, len);
358        mDataSize = len;
359        mFdsKnown = false;
360    }
361    return err;
362}
363
364status_t Parcel::appendFrom(const Parcel *parcel, size_t offset, size_t len)
365{
366    const sp<ProcessState> proc(ProcessState::self());
367    status_t err;
368    const uint8_t *data = parcel->mData;
369    const binder_size_t *objects = parcel->mObjects;
370    size_t size = parcel->mObjectsSize;
371    int startPos = mDataPos;
372    int firstIndex = -1, lastIndex = -2;
373
374    if (len == 0) {
375        return NO_ERROR;
376    }
377
378    // range checks against the source parcel size
379    if ((offset > parcel->mDataSize)
380            || (len > parcel->mDataSize)
381            || (offset + len > parcel->mDataSize)) {
382        return BAD_VALUE;
383    }
384
385    // Count objects in range
386    for (int i = 0; i < (int) size; i++) {
387        size_t off = objects[i];
388        if ((off >= offset) && (off < offset + len)) {
389            if (firstIndex == -1) {
390                firstIndex = i;
391            }
392            lastIndex = i;
393        }
394    }
395    int numObjects = lastIndex - firstIndex + 1;
396
397    if ((mDataSize+len) > mDataCapacity) {
398        // grow data
399        err = growData(len);
400        if (err != NO_ERROR) {
401            return err;
402        }
403    }
404
405    // append data
406    memcpy(mData + mDataPos, data + offset, len);
407    mDataPos += len;
408    mDataSize += len;
409
410    err = NO_ERROR;
411
412    if (numObjects > 0) {
413        // grow objects
414        if (mObjectsCapacity < mObjectsSize + numObjects) {
415            int newSize = ((mObjectsSize + numObjects)*3)/2;
416            binder_size_t *objects =
417                (binder_size_t*)realloc(mObjects, newSize*sizeof(binder_size_t));
418            if (objects == (binder_size_t*)0) {
419                return NO_MEMORY;
420            }
421            mObjects = objects;
422            mObjectsCapacity = newSize;
423        }
424
425        // append and acquire objects
426        int idx = mObjectsSize;
427        for (int i = firstIndex; i <= lastIndex; i++) {
428            size_t off = objects[i] - offset + startPos;
429            mObjects[idx++] = off;
430            mObjectsSize++;
431
432            flat_binder_object* flat
433                = reinterpret_cast<flat_binder_object*>(mData + off);
434            acquire_object(proc, *flat, this);
435
436            if (flat->type == BINDER_TYPE_FD) {
437                // If this is a file descriptor, we need to dup it so the
438                // new Parcel now owns its own fd, and can declare that we
439                // officially know we have fds.
440                flat->handle = dup(flat->handle);
441                flat->cookie = 1;
442                mHasFds = mFdsKnown = true;
443                if (!mAllowFds) {
444                    err = FDS_NOT_ALLOWED;
445                }
446            }
447        }
448    }
449
450    return err;
451}
452
453bool Parcel::pushAllowFds(bool allowFds)
454{
455    const bool origValue = mAllowFds;
456    if (!allowFds) {
457        mAllowFds = false;
458    }
459    return origValue;
460}
461
462void Parcel::restoreAllowFds(bool lastValue)
463{
464    mAllowFds = lastValue;
465}
466
467bool Parcel::hasFileDescriptors() const
468{
469    if (!mFdsKnown) {
470        scanForFds();
471    }
472    return mHasFds;
473}
474
475// Write RPC headers.  (previously just the interface token)
476status_t Parcel::writeInterfaceToken(const String16& interface)
477{
478    writeInt32(IPCThreadState::self()->getStrictModePolicy() |
479               STRICT_MODE_PENALTY_GATHER);
480    // currently the interface identification token is just its name as a string
481    return writeString16(interface);
482}
483
484bool Parcel::checkInterface(IBinder* binder) const
485{
486    return enforceInterface(binder->getInterfaceDescriptor());
487}
488
489bool Parcel::enforceInterface(const String16& interface,
490                              IPCThreadState* threadState) const
491{
492    int32_t strictPolicy = readInt32();
493    if (threadState == NULL) {
494        threadState = IPCThreadState::self();
495    }
496    if ((threadState->getLastTransactionBinderFlags() &
497         IBinder::FLAG_ONEWAY) != 0) {
498      // For one-way calls, the callee is running entirely
499      // disconnected from the caller, so disable StrictMode entirely.
500      // Not only does disk/network usage not impact the caller, but
501      // there's no way to commuicate back any violations anyway.
502      threadState->setStrictModePolicy(0);
503    } else {
504      threadState->setStrictModePolicy(strictPolicy);
505    }
506    const String16 str(readString16());
507    if (str == interface) {
508        return true;
509    } else {
510        ALOGW("**** enforceInterface() expected '%s' but read '%s'\n",
511                String8(interface).string(), String8(str).string());
512        return false;
513    }
514}
515
516const binder_size_t* Parcel::objects() const
517{
518    return mObjects;
519}
520
521size_t Parcel::objectsCount() const
522{
523    return mObjectsSize;
524}
525
526status_t Parcel::errorCheck() const
527{
528    return mError;
529}
530
531void Parcel::setError(status_t err)
532{
533    mError = err;
534}
535
536status_t Parcel::finishWrite(size_t len)
537{
538    //printf("Finish write of %d\n", len);
539    mDataPos += len;
540    ALOGV("finishWrite Setting data pos of %p to %d\n", this, mDataPos);
541    if (mDataPos > mDataSize) {
542        mDataSize = mDataPos;
543        ALOGV("finishWrite Setting data size of %p to %d\n", this, mDataSize);
544    }
545    //printf("New pos=%d, size=%d\n", mDataPos, mDataSize);
546    return NO_ERROR;
547}
548
549status_t Parcel::writeUnpadded(const void* data, size_t len)
550{
551    size_t end = mDataPos + len;
552    if (end < mDataPos) {
553        // integer overflow
554        return BAD_VALUE;
555    }
556
557    if (end <= mDataCapacity) {
558restart_write:
559        memcpy(mData+mDataPos, data, len);
560        return finishWrite(len);
561    }
562
563    status_t err = growData(len);
564    if (err == NO_ERROR) goto restart_write;
565    return err;
566}
567
568status_t Parcel::write(const void* data, size_t len)
569{
570    void* const d = writeInplace(len);
571    if (d) {
572        memcpy(d, data, len);
573        return NO_ERROR;
574    }
575    return mError;
576}
577
578void* Parcel::writeInplace(size_t len)
579{
580    const size_t padded = PAD_SIZE(len);
581
582    // sanity check for integer overflow
583    if (mDataPos+padded < mDataPos) {
584        return NULL;
585    }
586
587    if ((mDataPos+padded) <= mDataCapacity) {
588restart_write:
589        //printf("Writing %ld bytes, padded to %ld\n", len, padded);
590        uint8_t* const data = mData+mDataPos;
591
592        // Need to pad at end?
593        if (padded != len) {
594#if BYTE_ORDER == BIG_ENDIAN
595            static const uint32_t mask[4] = {
596                0x00000000, 0xffffff00, 0xffff0000, 0xff000000
597            };
598#endif
599#if BYTE_ORDER == LITTLE_ENDIAN
600            static const uint32_t mask[4] = {
601                0x00000000, 0x00ffffff, 0x0000ffff, 0x000000ff
602            };
603#endif
604            //printf("Applying pad mask: %p to %p\n", (void*)mask[padded-len],
605            //    *reinterpret_cast<void**>(data+padded-4));
606            *reinterpret_cast<uint32_t*>(data+padded-4) &= mask[padded-len];
607        }
608
609        finishWrite(padded);
610        return data;
611    }
612
613    status_t err = growData(padded);
614    if (err == NO_ERROR) goto restart_write;
615    return NULL;
616}
617
618status_t Parcel::writeInt32(int32_t val)
619{
620    return writeAligned(val);
621}
622status_t Parcel::writeInt32Array(size_t len, const int32_t *val) {
623    if (!val) {
624        return writeAligned(-1);
625    }
626    status_t ret = writeAligned(len);
627    if (ret == NO_ERROR) {
628        ret = write(val, len * sizeof(*val));
629    }
630    return ret;
631}
632
633status_t Parcel::writeInt64(int64_t val)
634{
635    return writeAligned(val);
636}
637
638status_t Parcel::writePointer(uintptr_t val)
639{
640    return writeAligned<binder_uintptr_t>(val);
641}
642
643status_t Parcel::writeFloat(float val)
644{
645    return writeAligned(val);
646}
647
648#if defined(__mips__) && defined(__mips_hard_float)
649
650status_t Parcel::writeDouble(double val)
651{
652    union {
653        double d;
654        unsigned long long ll;
655    } u;
656    u.d = val;
657    return writeAligned(u.ll);
658}
659
660#else
661
662status_t Parcel::writeDouble(double val)
663{
664    return writeAligned(val);
665}
666
667#endif
668
669status_t Parcel::writeIntPtr(intptr_t val)
670{
671    return writeAligned(val);
672}
673
674status_t Parcel::writeCString(const char* str)
675{
676    return write(str, strlen(str)+1);
677}
678
679status_t Parcel::writeString8(const String8& str)
680{
681    status_t err = writeInt32(str.bytes());
682    // only write string if its length is more than zero characters,
683    // as readString8 will only read if the length field is non-zero.
684    // this is slightly different from how writeString16 works.
685    if (str.bytes() > 0 && err == NO_ERROR) {
686        err = write(str.string(), str.bytes()+1);
687    }
688    return err;
689}
690
691status_t Parcel::writeString16(const String16& str)
692{
693    return writeString16(str.string(), str.size());
694}
695
696status_t Parcel::writeString16(const char16_t* str, size_t len)
697{
698    if (str == NULL) return writeInt32(-1);
699
700    status_t err = writeInt32(len);
701    if (err == NO_ERROR) {
702        len *= sizeof(char16_t);
703        uint8_t* data = (uint8_t*)writeInplace(len+sizeof(char16_t));
704        if (data) {
705            memcpy(data, str, len);
706            *reinterpret_cast<char16_t*>(data+len) = 0;
707            return NO_ERROR;
708        }
709        err = mError;
710    }
711    return err;
712}
713
714status_t Parcel::writeStrongBinder(const sp<IBinder>& val)
715{
716    return flatten_binder(ProcessState::self(), val, this);
717}
718
719status_t Parcel::writeWeakBinder(const wp<IBinder>& val)
720{
721    return flatten_binder(ProcessState::self(), val, this);
722}
723
724status_t Parcel::writeNativeHandle(const native_handle* handle)
725{
726    if (!handle || handle->version != sizeof(native_handle))
727        return BAD_TYPE;
728
729    status_t err;
730    err = writeInt32(handle->numFds);
731    if (err != NO_ERROR) return err;
732
733    err = writeInt32(handle->numInts);
734    if (err != NO_ERROR) return err;
735
736    for (int i=0 ; err==NO_ERROR && i<handle->numFds ; i++)
737        err = writeDupFileDescriptor(handle->data[i]);
738
739    if (err != NO_ERROR) {
740        ALOGD("write native handle, write dup fd failed");
741        return err;
742    }
743    err = write(handle->data + handle->numFds, sizeof(int)*handle->numInts);
744    return err;
745}
746
747status_t Parcel::writeFileDescriptor(int fd, bool takeOwnership)
748{
749    flat_binder_object obj;
750    obj.type = BINDER_TYPE_FD;
751    obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS;
752    obj.handle = fd;
753    obj.cookie = takeOwnership ? 1 : 0;
754    return writeObject(obj, true);
755}
756
757status_t Parcel::writeDupFileDescriptor(int fd)
758{
759    int dupFd = dup(fd);
760    if (dupFd < 0) {
761        return -errno;
762    }
763    status_t err = writeFileDescriptor(dupFd, true /*takeOwnership*/);
764    if (err) {
765        close(dupFd);
766    }
767    return err;
768}
769
770// WARNING: This method must stay in sync with
771// Parcelable.Creator<ParcelFileDescriptor> CREATOR
772// in frameworks/base/core/java/android/os/ParcelFileDescriptor.java
773status_t Parcel::writeParcelFileDescriptor(int fd, int commChannel) {
774    status_t status;
775
776    if (fd < 0) {
777        status = writeInt32(0); // ParcelFileDescriptor is null
778        if (status) return status;
779    } else {
780        status = writeInt32(1); // ParcelFileDescriptor is not null
781        if (status) return status;
782        status = writeDupFileDescriptor(fd);
783        if (status) return status;
784        if (commChannel < 0) {
785            status = writeInt32(0); // commChannel is null
786            if (status) return status;
787        } else {
788            status = writeInt32(1); // commChannel is not null
789            if (status) return status;
790            status = writeDupFileDescriptor(commChannel);
791        }
792    }
793    return status;
794}
795
796status_t Parcel::writeBlob(size_t len, WritableBlob* outBlob)
797{
798    status_t status;
799
800    if (!mAllowFds || len <= IN_PLACE_BLOB_LIMIT) {
801        ALOGV("writeBlob: write in place");
802        status = writeInt32(0);
803        if (status) return status;
804
805        void* ptr = writeInplace(len);
806        if (!ptr) return NO_MEMORY;
807
808        outBlob->init(false /*mapped*/, ptr, len);
809        return NO_ERROR;
810    }
811
812    ALOGV("writeBlob: write to ashmem");
813    int fd = ashmem_create_region("Parcel Blob", len);
814    if (fd < 0) return NO_MEMORY;
815
816    int result = ashmem_set_prot_region(fd, PROT_READ | PROT_WRITE);
817    if (result < 0) {
818        status = result;
819    } else {
820        void* ptr = ::mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
821        if (ptr == MAP_FAILED) {
822            status = -errno;
823        } else {
824            result = ashmem_set_prot_region(fd, PROT_READ);
825            if (result < 0) {
826                status = result;
827            } else {
828                status = writeInt32(1);
829                if (!status) {
830                    status = writeFileDescriptor(fd, true /*takeOwnership*/);
831                    if (!status) {
832                        outBlob->init(true /*mapped*/, ptr, len);
833                        return NO_ERROR;
834                    }
835                }
836            }
837        }
838        ::munmap(ptr, len);
839    }
840    ::close(fd);
841    return status;
842}
843
844status_t Parcel::write(const FlattenableHelperInterface& val)
845{
846    status_t err;
847
848    // size if needed
849    const size_t len = val.getFlattenedSize();
850    const size_t fd_count = val.getFdCount();
851
852    err = this->writeInt32(len);
853    if (err) return err;
854
855    err = this->writeInt32(fd_count);
856    if (err) return err;
857
858    // payload
859    void* const buf = this->writeInplace(PAD_SIZE(len));
860    if (buf == NULL)
861        return BAD_VALUE;
862
863    int* fds = NULL;
864    if (fd_count) {
865        fds = new int[fd_count];
866    }
867
868    err = val.flatten(buf, len, fds, fd_count);
869    for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) {
870        err = this->writeDupFileDescriptor( fds[i] );
871    }
872
873    if (fd_count) {
874        delete [] fds;
875    }
876
877    return err;
878}
879
880status_t Parcel::writeObject(const flat_binder_object& val, bool nullMetaData)
881{
882    const bool enoughData = (mDataPos+sizeof(val)) <= mDataCapacity;
883    const bool enoughObjects = mObjectsSize < mObjectsCapacity;
884    if (enoughData && enoughObjects) {
885restart_write:
886        *reinterpret_cast<flat_binder_object*>(mData+mDataPos) = val;
887
888        // Need to write meta-data?
889        if (nullMetaData || val.binder != 0) {
890            mObjects[mObjectsSize] = mDataPos;
891            acquire_object(ProcessState::self(), val, this);
892            mObjectsSize++;
893        }
894
895        // remember if it's a file descriptor
896        if (val.type == BINDER_TYPE_FD) {
897            if (!mAllowFds) {
898                return FDS_NOT_ALLOWED;
899            }
900            mHasFds = mFdsKnown = true;
901        }
902
903        return finishWrite(sizeof(flat_binder_object));
904    }
905
906    if (!enoughData) {
907        const status_t err = growData(sizeof(val));
908        if (err != NO_ERROR) return err;
909    }
910    if (!enoughObjects) {
911        size_t newSize = ((mObjectsSize+2)*3)/2;
912        binder_size_t* objects = (binder_size_t*)realloc(mObjects, newSize*sizeof(binder_size_t));
913        if (objects == NULL) return NO_MEMORY;
914        mObjects = objects;
915        mObjectsCapacity = newSize;
916    }
917
918    goto restart_write;
919}
920
921status_t Parcel::writeNoException()
922{
923    return writeInt32(0);
924}
925
926void Parcel::remove(size_t /*start*/, size_t /*amt*/)
927{
928    LOG_ALWAYS_FATAL("Parcel::remove() not yet implemented!");
929}
930
931status_t Parcel::read(void* outData, size_t len) const
932{
933    if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize) {
934        memcpy(outData, mData+mDataPos, len);
935        mDataPos += PAD_SIZE(len);
936        ALOGV("read Setting data pos of %p to %d\n", this, mDataPos);
937        return NO_ERROR;
938    }
939    return NOT_ENOUGH_DATA;
940}
941
942const void* Parcel::readInplace(size_t len) const
943{
944    if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize) {
945        const void* data = mData+mDataPos;
946        mDataPos += PAD_SIZE(len);
947        ALOGV("readInplace Setting data pos of %p to %d\n", this, mDataPos);
948        return data;
949    }
950    return NULL;
951}
952
953template<class T>
954status_t Parcel::readAligned(T *pArg) const {
955    COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE(sizeof(T)) == sizeof(T));
956
957    if ((mDataPos+sizeof(T)) <= mDataSize) {
958        const void* data = mData+mDataPos;
959        mDataPos += sizeof(T);
960        *pArg =  *reinterpret_cast<const T*>(data);
961        return NO_ERROR;
962    } else {
963        return NOT_ENOUGH_DATA;
964    }
965}
966
967template<class T>
968T Parcel::readAligned() const {
969    T result;
970    if (readAligned(&result) != NO_ERROR) {
971        result = 0;
972    }
973
974    return result;
975}
976
977template<class T>
978status_t Parcel::writeAligned(T val) {
979    COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE(sizeof(T)) == sizeof(T));
980
981    if ((mDataPos+sizeof(val)) <= mDataCapacity) {
982restart_write:
983        *reinterpret_cast<T*>(mData+mDataPos) = val;
984        return finishWrite(sizeof(val));
985    }
986
987    status_t err = growData(sizeof(val));
988    if (err == NO_ERROR) goto restart_write;
989    return err;
990}
991
992status_t Parcel::readInt32(int32_t *pArg) const
993{
994    return readAligned(pArg);
995}
996
997int32_t Parcel::readInt32() const
998{
999    return readAligned<int32_t>();
1000}
1001
1002
1003status_t Parcel::readInt64(int64_t *pArg) const
1004{
1005    return readAligned(pArg);
1006}
1007
1008
1009int64_t Parcel::readInt64() const
1010{
1011    return readAligned<int64_t>();
1012}
1013
1014status_t Parcel::readPointer(uintptr_t *pArg) const
1015{
1016    status_t ret;
1017    binder_uintptr_t ptr;
1018    ret = readAligned(&ptr);
1019    if (!ret)
1020        *pArg = ptr;
1021    return ret;
1022}
1023
1024uintptr_t Parcel::readPointer() const
1025{
1026    return readAligned<binder_uintptr_t>();
1027}
1028
1029
1030status_t Parcel::readFloat(float *pArg) const
1031{
1032    return readAligned(pArg);
1033}
1034
1035
1036float Parcel::readFloat() const
1037{
1038    return readAligned<float>();
1039}
1040
1041#if defined(__mips__) && defined(__mips_hard_float)
1042
1043status_t Parcel::readDouble(double *pArg) const
1044{
1045    union {
1046      double d;
1047      unsigned long long ll;
1048    } u;
1049    status_t status;
1050    status = readAligned(&u.ll);
1051    *pArg = u.d;
1052    return status;
1053}
1054
1055double Parcel::readDouble() const
1056{
1057    union {
1058      double d;
1059      unsigned long long ll;
1060    } u;
1061    u.ll = readAligned<unsigned long long>();
1062    return u.d;
1063}
1064
1065#else
1066
1067status_t Parcel::readDouble(double *pArg) const
1068{
1069    return readAligned(pArg);
1070}
1071
1072double Parcel::readDouble() const
1073{
1074    return readAligned<double>();
1075}
1076
1077#endif
1078
1079status_t Parcel::readIntPtr(intptr_t *pArg) const
1080{
1081    return readAligned(pArg);
1082}
1083
1084
1085intptr_t Parcel::readIntPtr() const
1086{
1087    return readAligned<intptr_t>();
1088}
1089
1090
1091const char* Parcel::readCString() const
1092{
1093    const size_t avail = mDataSize-mDataPos;
1094    if (avail > 0) {
1095        const char* str = reinterpret_cast<const char*>(mData+mDataPos);
1096        // is the string's trailing NUL within the parcel's valid bounds?
1097        const char* eos = reinterpret_cast<const char*>(memchr(str, 0, avail));
1098        if (eos) {
1099            const size_t len = eos - str;
1100            mDataPos += PAD_SIZE(len+1);
1101            ALOGV("readCString Setting data pos of %p to %d\n", this, mDataPos);
1102            return str;
1103        }
1104    }
1105    return NULL;
1106}
1107
1108String8 Parcel::readString8() const
1109{
1110    int32_t size = readInt32();
1111    // watch for potential int overflow adding 1 for trailing NUL
1112    if (size > 0 && size < INT32_MAX) {
1113        const char* str = (const char*)readInplace(size+1);
1114        if (str) return String8(str, size);
1115    }
1116    return String8();
1117}
1118
1119String16 Parcel::readString16() const
1120{
1121    size_t len;
1122    const char16_t* str = readString16Inplace(&len);
1123    if (str) return String16(str, len);
1124    ALOGE("Reading a NULL string not supported here.");
1125    return String16();
1126}
1127
1128const char16_t* Parcel::readString16Inplace(size_t* outLen) const
1129{
1130    int32_t size = readInt32();
1131    // watch for potential int overflow from size+1
1132    if (size >= 0 && size < INT32_MAX) {
1133        *outLen = size;
1134        const char16_t* str = (const char16_t*)readInplace((size+1)*sizeof(char16_t));
1135        if (str != NULL) {
1136            return str;
1137        }
1138    }
1139    *outLen = 0;
1140    return NULL;
1141}
1142
1143sp<IBinder> Parcel::readStrongBinder() const
1144{
1145    sp<IBinder> val;
1146    unflatten_binder(ProcessState::self(), *this, &val);
1147    return val;
1148}
1149
1150wp<IBinder> Parcel::readWeakBinder() const
1151{
1152    wp<IBinder> val;
1153    unflatten_binder(ProcessState::self(), *this, &val);
1154    return val;
1155}
1156
1157int32_t Parcel::readExceptionCode() const
1158{
1159  int32_t exception_code = readAligned<int32_t>();
1160  if (exception_code == EX_HAS_REPLY_HEADER) {
1161    int32_t header_start = dataPosition();
1162    int32_t header_size = readAligned<int32_t>();
1163    // Skip over fat responses headers.  Not used (or propagated) in
1164    // native code
1165    setDataPosition(header_start + header_size);
1166    // And fat response headers are currently only used when there are no
1167    // exceptions, so return no error:
1168    return 0;
1169  }
1170  return exception_code;
1171}
1172
1173native_handle* Parcel::readNativeHandle() const
1174{
1175    int numFds, numInts;
1176    status_t err;
1177    err = readInt32(&numFds);
1178    if (err != NO_ERROR) return 0;
1179    err = readInt32(&numInts);
1180    if (err != NO_ERROR) return 0;
1181
1182    native_handle* h = native_handle_create(numFds, numInts);
1183    for (int i=0 ; err==NO_ERROR && i<numFds ; i++) {
1184        h->data[i] = dup(readFileDescriptor());
1185        if (h->data[i] < 0) err = BAD_VALUE;
1186    }
1187    err = read(h->data + numFds, sizeof(int)*numInts);
1188    if (err != NO_ERROR) {
1189        native_handle_close(h);
1190        native_handle_delete(h);
1191        h = 0;
1192    }
1193    return h;
1194}
1195
1196
1197int Parcel::readFileDescriptor() const
1198{
1199    const flat_binder_object* flat = readObject(true);
1200    if (flat) {
1201        switch (flat->type) {
1202            case BINDER_TYPE_FD:
1203                //ALOGI("Returning file descriptor %ld from parcel %p\n", flat->handle, this);
1204                return flat->handle;
1205        }
1206    }
1207    return BAD_TYPE;
1208}
1209
1210// WARNING: This method must stay in sync with writeToParcel()
1211// in frameworks/base/core/java/android/os/ParcelFileDescriptor.java
1212int Parcel::readParcelFileDescriptor(int& outCommChannel) const {
1213    int fd;
1214    outCommChannel = -1;
1215
1216    if (readInt32() == 0) {
1217        fd = -1;
1218    } else {
1219        fd = readFileDescriptor();
1220        if (fd >= 0 && readInt32() != 0) {
1221            outCommChannel = readFileDescriptor();
1222        }
1223    }
1224    return fd;
1225}
1226
1227status_t Parcel::readBlob(size_t len, ReadableBlob* outBlob) const
1228{
1229    int32_t useAshmem;
1230    status_t status = readInt32(&useAshmem);
1231    if (status) return status;
1232
1233    if (!useAshmem) {
1234        ALOGV("readBlob: read in place");
1235        const void* ptr = readInplace(len);
1236        if (!ptr) return BAD_VALUE;
1237
1238        outBlob->init(false /*mapped*/, const_cast<void*>(ptr), len);
1239        return NO_ERROR;
1240    }
1241
1242    ALOGV("readBlob: read from ashmem");
1243    int fd = readFileDescriptor();
1244    if (fd == int(BAD_TYPE)) return BAD_VALUE;
1245
1246    void* ptr = ::mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0);
1247    if (!ptr) return NO_MEMORY;
1248
1249    outBlob->init(true /*mapped*/, ptr, len);
1250    return NO_ERROR;
1251}
1252
1253status_t Parcel::read(FlattenableHelperInterface& val) const
1254{
1255    // size
1256    const size_t len = this->readInt32();
1257    const size_t fd_count = this->readInt32();
1258
1259    // payload
1260    void const* const buf = this->readInplace(PAD_SIZE(len));
1261    if (buf == NULL)
1262        return BAD_VALUE;
1263
1264    int* fds = NULL;
1265    if (fd_count) {
1266        fds = new int[fd_count];
1267    }
1268
1269    status_t err = NO_ERROR;
1270    for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) {
1271        fds[i] = dup(this->readFileDescriptor());
1272        if (fds[i] < 0) err = BAD_VALUE;
1273    }
1274
1275    if (err == NO_ERROR) {
1276        err = val.unflatten(buf, len, fds, fd_count);
1277    }
1278
1279    if (fd_count) {
1280        delete [] fds;
1281    }
1282
1283    return err;
1284}
1285const flat_binder_object* Parcel::readObject(bool nullMetaData) const
1286{
1287    const size_t DPOS = mDataPos;
1288    if ((DPOS+sizeof(flat_binder_object)) <= mDataSize) {
1289        const flat_binder_object* obj
1290                = reinterpret_cast<const flat_binder_object*>(mData+DPOS);
1291        mDataPos = DPOS + sizeof(flat_binder_object);
1292        if (!nullMetaData && (obj->cookie == 0 && obj->binder == 0)) {
1293            // When transferring a NULL object, we don't write it into
1294            // the object list, so we don't want to check for it when
1295            // reading.
1296            ALOGV("readObject Setting data pos of %p to %d\n", this, mDataPos);
1297            return obj;
1298        }
1299
1300        // Ensure that this object is valid...
1301        binder_size_t* const OBJS = mObjects;
1302        const size_t N = mObjectsSize;
1303        size_t opos = mNextObjectHint;
1304
1305        if (N > 0) {
1306            ALOGV("Parcel %p looking for obj at %d, hint=%d\n",
1307                 this, DPOS, opos);
1308
1309            // Start at the current hint position, looking for an object at
1310            // the current data position.
1311            if (opos < N) {
1312                while (opos < (N-1) && OBJS[opos] < DPOS) {
1313                    opos++;
1314                }
1315            } else {
1316                opos = N-1;
1317            }
1318            if (OBJS[opos] == DPOS) {
1319                // Found it!
1320                ALOGV("Parcel found obj %d at index %d with forward search",
1321                     this, DPOS, opos);
1322                mNextObjectHint = opos+1;
1323                ALOGV("readObject Setting data pos of %p to %d\n", this, mDataPos);
1324                return obj;
1325            }
1326
1327            // Look backwards for it...
1328            while (opos > 0 && OBJS[opos] > DPOS) {
1329                opos--;
1330            }
1331            if (OBJS[opos] == DPOS) {
1332                // Found it!
1333                ALOGV("Parcel found obj %d at index %d with backward search",
1334                     this, DPOS, opos);
1335                mNextObjectHint = opos+1;
1336                ALOGV("readObject Setting data pos of %p to %d\n", this, mDataPos);
1337                return obj;
1338            }
1339        }
1340        ALOGW("Attempt to read object from Parcel %p at offset %zu that is not in the object list",
1341             this, DPOS);
1342    }
1343    return NULL;
1344}
1345
1346void Parcel::closeFileDescriptors()
1347{
1348    size_t i = mObjectsSize;
1349    if (i > 0) {
1350        //ALOGI("Closing file descriptors for %d objects...", mObjectsSize);
1351    }
1352    while (i > 0) {
1353        i--;
1354        const flat_binder_object* flat
1355            = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]);
1356        if (flat->type == BINDER_TYPE_FD) {
1357            //ALOGI("Closing fd: %ld\n", flat->handle);
1358            close(flat->handle);
1359        }
1360    }
1361}
1362
1363uintptr_t Parcel::ipcData() const
1364{
1365    return reinterpret_cast<uintptr_t>(mData);
1366}
1367
1368size_t Parcel::ipcDataSize() const
1369{
1370    return (mDataSize > mDataPos ? mDataSize : mDataPos);
1371}
1372
1373uintptr_t Parcel::ipcObjects() const
1374{
1375    return reinterpret_cast<uintptr_t>(mObjects);
1376}
1377
1378size_t Parcel::ipcObjectsCount() const
1379{
1380    return mObjectsSize;
1381}
1382
1383void Parcel::ipcSetDataReference(const uint8_t* data, size_t dataSize,
1384    const binder_size_t* objects, size_t objectsCount, release_func relFunc, void* relCookie)
1385{
1386    size_t minOffset = 0;
1387    freeDataNoInit();
1388    mError = NO_ERROR;
1389    mData = const_cast<uint8_t*>(data);
1390    mDataSize = mDataCapacity = dataSize;
1391    //ALOGI("setDataReference Setting data size of %p to %lu (pid=%d)\n", this, mDataSize, getpid());
1392    mDataPos = 0;
1393    ALOGV("setDataReference Setting data pos of %p to %d\n", this, mDataPos);
1394    mObjects = const_cast<binder_size_t*>(objects);
1395    mObjectsSize = mObjectsCapacity = objectsCount;
1396    mNextObjectHint = 0;
1397    mOwner = relFunc;
1398    mOwnerCookie = relCookie;
1399    for (size_t i = 0; i < mObjectsSize; i++) {
1400        size_t offset = mObjects[i];
1401        if (offset < minOffset) {
1402            ALOGE("%s: bad object offset %zu < %zu\n",
1403                  __func__, offset, minOffset);
1404            mObjectsSize = 0;
1405            break;
1406        }
1407        minOffset = offset + sizeof(flat_binder_object);
1408    }
1409    scanForFds();
1410}
1411
1412void Parcel::print(TextOutput& to, uint32_t /*flags*/) const
1413{
1414    to << "Parcel(";
1415
1416    if (errorCheck() != NO_ERROR) {
1417        const status_t err = errorCheck();
1418        to << "Error: " << (void*)(intptr_t)err << " \"" << strerror(-err) << "\"";
1419    } else if (dataSize() > 0) {
1420        const uint8_t* DATA = data();
1421        to << indent << HexDump(DATA, dataSize()) << dedent;
1422        const binder_size_t* OBJS = objects();
1423        const size_t N = objectsCount();
1424        for (size_t i=0; i<N; i++) {
1425            const flat_binder_object* flat
1426                = reinterpret_cast<const flat_binder_object*>(DATA+OBJS[i]);
1427            to << endl << "Object #" << i << " @ " << (void*)OBJS[i] << ": "
1428                << TypeCode(flat->type & 0x7f7f7f00)
1429                << " = " << flat->binder;
1430        }
1431    } else {
1432        to << "NULL";
1433    }
1434
1435    to << ")";
1436}
1437
1438void Parcel::releaseObjects()
1439{
1440    const sp<ProcessState> proc(ProcessState::self());
1441    size_t i = mObjectsSize;
1442    uint8_t* const data = mData;
1443    binder_size_t* const objects = mObjects;
1444    while (i > 0) {
1445        i--;
1446        const flat_binder_object* flat
1447            = reinterpret_cast<flat_binder_object*>(data+objects[i]);
1448        release_object(proc, *flat, this);
1449    }
1450}
1451
1452void Parcel::acquireObjects()
1453{
1454    const sp<ProcessState> proc(ProcessState::self());
1455    size_t i = mObjectsSize;
1456    uint8_t* const data = mData;
1457    binder_size_t* const objects = mObjects;
1458    while (i > 0) {
1459        i--;
1460        const flat_binder_object* flat
1461            = reinterpret_cast<flat_binder_object*>(data+objects[i]);
1462        acquire_object(proc, *flat, this);
1463    }
1464}
1465
1466void Parcel::freeData()
1467{
1468    freeDataNoInit();
1469    initState();
1470}
1471
1472void Parcel::freeDataNoInit()
1473{
1474    if (mOwner) {
1475        //ALOGI("Freeing data ref of %p (pid=%d)\n", this, getpid());
1476        mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie);
1477    } else {
1478        releaseObjects();
1479        if (mData) free(mData);
1480        if (mObjects) free(mObjects);
1481    }
1482}
1483
1484status_t Parcel::growData(size_t len)
1485{
1486    size_t newSize = ((mDataSize+len)*3)/2;
1487    return (newSize <= mDataSize)
1488            ? (status_t) NO_MEMORY
1489            : continueWrite(newSize);
1490}
1491
1492status_t Parcel::restartWrite(size_t desired)
1493{
1494    if (mOwner) {
1495        freeData();
1496        return continueWrite(desired);
1497    }
1498
1499    uint8_t* data = (uint8_t*)realloc(mData, desired);
1500    if (!data && desired > mDataCapacity) {
1501        mError = NO_MEMORY;
1502        return NO_MEMORY;
1503    }
1504
1505    releaseObjects();
1506
1507    if (data) {
1508        mData = data;
1509        mDataCapacity = desired;
1510    }
1511
1512    mDataSize = mDataPos = 0;
1513    ALOGV("restartWrite Setting data size of %p to %d\n", this, mDataSize);
1514    ALOGV("restartWrite Setting data pos of %p to %d\n", this, mDataPos);
1515
1516    free(mObjects);
1517    mObjects = NULL;
1518    mObjectsSize = mObjectsCapacity = 0;
1519    mNextObjectHint = 0;
1520    mHasFds = false;
1521    mFdsKnown = true;
1522    mAllowFds = true;
1523
1524    return NO_ERROR;
1525}
1526
1527status_t Parcel::continueWrite(size_t desired)
1528{
1529    // If shrinking, first adjust for any objects that appear
1530    // after the new data size.
1531    size_t objectsSize = mObjectsSize;
1532    if (desired < mDataSize) {
1533        if (desired == 0) {
1534            objectsSize = 0;
1535        } else {
1536            while (objectsSize > 0) {
1537                if (mObjects[objectsSize-1] < desired)
1538                    break;
1539                objectsSize--;
1540            }
1541        }
1542    }
1543
1544    if (mOwner) {
1545        // If the size is going to zero, just release the owner's data.
1546        if (desired == 0) {
1547            freeData();
1548            return NO_ERROR;
1549        }
1550
1551        // If there is a different owner, we need to take
1552        // posession.
1553        uint8_t* data = (uint8_t*)malloc(desired);
1554        if (!data) {
1555            mError = NO_MEMORY;
1556            return NO_MEMORY;
1557        }
1558        binder_size_t* objects = NULL;
1559
1560        if (objectsSize) {
1561            objects = (binder_size_t*)malloc(objectsSize*sizeof(binder_size_t));
1562            if (!objects) {
1563                free(data);
1564
1565                mError = NO_MEMORY;
1566                return NO_MEMORY;
1567            }
1568
1569            // Little hack to only acquire references on objects
1570            // we will be keeping.
1571            size_t oldObjectsSize = mObjectsSize;
1572            mObjectsSize = objectsSize;
1573            acquireObjects();
1574            mObjectsSize = oldObjectsSize;
1575        }
1576
1577        if (mData) {
1578            memcpy(data, mData, mDataSize < desired ? mDataSize : desired);
1579        }
1580        if (objects && mObjects) {
1581            memcpy(objects, mObjects, objectsSize*sizeof(binder_size_t));
1582        }
1583        //ALOGI("Freeing data ref of %p (pid=%d)\n", this, getpid());
1584        mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie);
1585        mOwner = NULL;
1586
1587        mData = data;
1588        mObjects = objects;
1589        mDataSize = (mDataSize < desired) ? mDataSize : desired;
1590        ALOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize);
1591        mDataCapacity = desired;
1592        mObjectsSize = mObjectsCapacity = objectsSize;
1593        mNextObjectHint = 0;
1594
1595    } else if (mData) {
1596        if (objectsSize < mObjectsSize) {
1597            // Need to release refs on any objects we are dropping.
1598            const sp<ProcessState> proc(ProcessState::self());
1599            for (size_t i=objectsSize; i<mObjectsSize; i++) {
1600                const flat_binder_object* flat
1601                    = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]);
1602                if (flat->type == BINDER_TYPE_FD) {
1603                    // will need to rescan because we may have lopped off the only FDs
1604                    mFdsKnown = false;
1605                }
1606                release_object(proc, *flat, this);
1607            }
1608            binder_size_t* objects =
1609                (binder_size_t*)realloc(mObjects, objectsSize*sizeof(binder_size_t));
1610            if (objects) {
1611                mObjects = objects;
1612            }
1613            mObjectsSize = objectsSize;
1614            mNextObjectHint = 0;
1615        }
1616
1617        // We own the data, so we can just do a realloc().
1618        if (desired > mDataCapacity) {
1619            uint8_t* data = (uint8_t*)realloc(mData, desired);
1620            if (data) {
1621                mData = data;
1622                mDataCapacity = desired;
1623            } else if (desired > mDataCapacity) {
1624                mError = NO_MEMORY;
1625                return NO_MEMORY;
1626            }
1627        } else {
1628            if (mDataSize > desired) {
1629                mDataSize = desired;
1630                ALOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize);
1631            }
1632            if (mDataPos > desired) {
1633                mDataPos = desired;
1634                ALOGV("continueWrite Setting data pos of %p to %d\n", this, mDataPos);
1635            }
1636        }
1637
1638    } else {
1639        // This is the first data.  Easy!
1640        uint8_t* data = (uint8_t*)malloc(desired);
1641        if (!data) {
1642            mError = NO_MEMORY;
1643            return NO_MEMORY;
1644        }
1645
1646        if(!(mDataCapacity == 0 && mObjects == NULL
1647             && mObjectsCapacity == 0)) {
1648            ALOGE("continueWrite: %zu/%p/%zu/%zu", mDataCapacity, mObjects, mObjectsCapacity, desired);
1649        }
1650
1651        mData = data;
1652        mDataSize = mDataPos = 0;
1653        ALOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize);
1654        ALOGV("continueWrite Setting data pos of %p to %d\n", this, mDataPos);
1655        mDataCapacity = desired;
1656    }
1657
1658    return NO_ERROR;
1659}
1660
1661void Parcel::initState()
1662{
1663    mError = NO_ERROR;
1664    mData = 0;
1665    mDataSize = 0;
1666    mDataCapacity = 0;
1667    mDataPos = 0;
1668    ALOGV("initState Setting data size of %p to %d\n", this, mDataSize);
1669    ALOGV("initState Setting data pos of %p to %d\n", this, mDataPos);
1670    mObjects = NULL;
1671    mObjectsSize = 0;
1672    mObjectsCapacity = 0;
1673    mNextObjectHint = 0;
1674    mHasFds = false;
1675    mFdsKnown = true;
1676    mAllowFds = true;
1677    mOwner = NULL;
1678}
1679
1680void Parcel::scanForFds() const
1681{
1682    bool hasFds = false;
1683    for (size_t i=0; i<mObjectsSize; i++) {
1684        const flat_binder_object* flat
1685            = reinterpret_cast<const flat_binder_object*>(mData + mObjects[i]);
1686        if (flat->type == BINDER_TYPE_FD) {
1687            hasFds = true;
1688            break;
1689        }
1690    }
1691    mHasFds = hasFds;
1692    mFdsKnown = true;
1693}
1694
1695// --- Parcel::Blob ---
1696
1697Parcel::Blob::Blob() :
1698        mMapped(false), mData(NULL), mSize(0) {
1699}
1700
1701Parcel::Blob::~Blob() {
1702    release();
1703}
1704
1705void Parcel::Blob::release() {
1706    if (mMapped && mData) {
1707        ::munmap(mData, mSize);
1708    }
1709    clear();
1710}
1711
1712void Parcel::Blob::init(bool mapped, void* data, size_t size) {
1713    mMapped = mapped;
1714    mData = data;
1715    mSize = size;
1716}
1717
1718void Parcel::Blob::clear() {
1719    mMapped = false;
1720    mData = NULL;
1721    mSize = 0;
1722}
1723
1724}; // namespace android
1725