Parcel.cpp revision 775f2e6dbf757d1b1853337c19bf15f15a127e31 
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 <errno.h>
29#include <utils/CallStack.h>
30#include <utils/Debug.h>
31#include <utils/Log.h>
32#include <utils/String8.h>
33#include <utils/String16.h>
34#include <utils/misc.h>
35#include <utils/Flattenable.h>
36#include <cutils/ashmem.h>
37
38#include <private/binder/binder_module.h>
39
40#include <fcntl.h>
41#include <inttypes.h>
42#include <stdio.h>
43#include <stdlib.h>
44#include <stdint.h>
45#include <sys/mman.h>
46
47#ifndef INT32_MAX
48#define INT32_MAX ((int32_t)(2147483647))
49#endif
50
51#define LOG_REFS(...)
52//#define LOG_REFS(...) ALOG(LOG_DEBUG, "Parcel", __VA_ARGS__)
53
54// ---------------------------------------------------------------------------
55
56#define PAD_SIZE(s) (((s)+3)&~3)
57
58// Note: must be kept in sync with android/os/StrictMode.java's PENALTY_GATHER
59#define STRICT_MODE_PENALTY_GATHER 0x100
60
61// Note: must be kept in sync with android/os/Parcel.java's EX_HAS_REPLY_HEADER
62#define EX_HAS_REPLY_HEADER -128
63
64// Maximum size of a blob to transfer in-place.
65static const size_t IN_PLACE_BLOB_LIMIT = 40 * 1024;
66
67// XXX This can be made public if we want to provide
68// support for typed data.
69struct small_flat_data
70{
71    uint32_t type;
72    uint32_t data;
73};
74
75namespace android {
76
77void acquire_object(const sp<ProcessState>& proc,
78    const flat_binder_object& obj, const void* who)
79{
80    switch (obj.type) {
81        case BINDER_TYPE_BINDER:
82            if (obj.binder) {
83                LOG_REFS("Parcel %p acquiring reference on local %p", who, obj.cookie);
84                reinterpret_cast<IBinder*>(obj.cookie)->incStrong(who);
85            }
86            return;
87        case BINDER_TYPE_WEAK_BINDER:
88            if (obj.binder)
89                reinterpret_cast<RefBase::weakref_type*>(obj.binder)->incWeak(who);
90            return;
91        case BINDER_TYPE_HANDLE: {
92            const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle);
93            if (b != NULL) {
94                LOG_REFS("Parcel %p acquiring reference on remote %p", who, b.get());
95                b->incStrong(who);
96            }
97            return;
98        }
99        case BINDER_TYPE_WEAK_HANDLE: {
100            const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle);
101            if (b != NULL) b.get_refs()->incWeak(who);
102            return;
103        }
104        case BINDER_TYPE_FD: {
105            // intentionally blank -- nothing to do to acquire this, but we do
106            // recognize it as a legitimate object type.
107            return;
108        }
109    }
110
111    ALOGD("Invalid object type 0x%08x", obj.type);
112}
113
114void release_object(const sp<ProcessState>& proc,
115    const flat_binder_object& obj, const void* who)
116{
117    switch (obj.type) {
118        case BINDER_TYPE_BINDER:
119            if (obj.binder) {
120                LOG_REFS("Parcel %p releasing reference on local %p", who, obj.cookie);
121                reinterpret_cast<IBinder*>(obj.cookie)->decStrong(who);
122            }
123            return;
124        case BINDER_TYPE_WEAK_BINDER:
125            if (obj.binder)
126                reinterpret_cast<RefBase::weakref_type*>(obj.binder)->decWeak(who);
127            return;
128        case BINDER_TYPE_HANDLE: {
129            const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle);
130            if (b != NULL) {
131                LOG_REFS("Parcel %p releasing reference on remote %p", who, b.get());
132                b->decStrong(who);
133            }
134            return;
135        }
136        case BINDER_TYPE_WEAK_HANDLE: {
137            const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle);
138            if (b != NULL) b.get_refs()->decWeak(who);
139            return;
140        }
141        case BINDER_TYPE_FD: {
142            if (obj.cookie != 0) close(obj.handle);
143            return;
144        }
145    }
146
147    ALOGE("Invalid object type 0x%08x", obj.type);
148}
149
150inline static status_t finish_flatten_binder(
151    const sp<IBinder>& /*binder*/, const flat_binder_object& flat, Parcel* out)
152{
153    return out->writeObject(flat, false);
154}
155
156status_t flatten_binder(const sp<ProcessState>& /*proc*/,
157    const sp<IBinder>& binder, Parcel* out)
158{
159    flat_binder_object obj;
160
161    obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS;
162    if (binder != NULL) {
163        IBinder *local = binder->localBinder();
164        if (!local) {
165            BpBinder *proxy = binder->remoteBinder();
166            if (proxy == NULL) {
167                ALOGE("null proxy");
168            }
169            const int32_t handle = proxy ? proxy->handle() : 0;
170            obj.type = BINDER_TYPE_HANDLE;
171            obj.binder = 0; /* Don't pass uninitialized stack data to a remote process */
172            obj.handle = handle;
173            obj.cookie = 0;
174        } else {
175            obj.type = BINDER_TYPE_BINDER;
176            obj.binder = reinterpret_cast<uintptr_t>(local->getWeakRefs());
177            obj.cookie = reinterpret_cast<uintptr_t>(local);
178        }
179    } else {
180        obj.type = BINDER_TYPE_BINDER;
181        obj.binder = 0;
182        obj.cookie = 0;
183    }
184
185    return finish_flatten_binder(binder, obj, out);
186}
187
188status_t flatten_binder(const sp<ProcessState>& /*proc*/,
189    const wp<IBinder>& binder, Parcel* out)
190{
191    flat_binder_object obj;
192
193    obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS;
194    if (binder != NULL) {
195        sp<IBinder> real = binder.promote();
196        if (real != NULL) {
197            IBinder *local = real->localBinder();
198            if (!local) {
199                BpBinder *proxy = real->remoteBinder();
200                if (proxy == NULL) {
201                    ALOGE("null proxy");
202                }
203                const int32_t handle = proxy ? proxy->handle() : 0;
204                obj.type = BINDER_TYPE_WEAK_HANDLE;
205                obj.binder = 0; /* Don't pass uninitialized stack data to a remote process */
206                obj.handle = handle;
207                obj.cookie = 0;
208            } else {
209                obj.type = BINDER_TYPE_WEAK_BINDER;
210                obj.binder = reinterpret_cast<uintptr_t>(binder.get_refs());
211                obj.cookie = reinterpret_cast<uintptr_t>(binder.unsafe_get());
212            }
213            return finish_flatten_binder(real, obj, out);
214        }
215
216        // XXX How to deal?  In order to flatten the given binder,
217        // we need to probe it for information, which requires a primary
218        // reference...  but we don't have one.
219        //
220        // The OpenBinder implementation uses a dynamic_cast<> here,
221        // but we can't do that with the different reference counting
222        // implementation we are using.
223        ALOGE("Unable to unflatten Binder weak reference!");
224        obj.type = BINDER_TYPE_BINDER;
225        obj.binder = 0;
226        obj.cookie = 0;
227        return finish_flatten_binder(NULL, obj, out);
228
229    } else {
230        obj.type = BINDER_TYPE_BINDER;
231        obj.binder = 0;
232        obj.cookie = 0;
233        return finish_flatten_binder(NULL, obj, out);
234    }
235}
236
237inline static status_t finish_unflatten_binder(
238    BpBinder* /*proxy*/, const flat_binder_object& /*flat*/,
239    const Parcel& /*in*/)
240{
241    return NO_ERROR;
242}
243
244status_t unflatten_binder(const sp<ProcessState>& proc,
245    const Parcel& in, sp<IBinder>* out)
246{
247    const flat_binder_object* flat = in.readObject(false);
248
249    if (flat) {
250        switch (flat->type) {
251            case BINDER_TYPE_BINDER:
252                *out = reinterpret_cast<IBinder*>(flat->cookie);
253                return finish_unflatten_binder(NULL, *flat, in);
254            case BINDER_TYPE_HANDLE:
255                *out = proc->getStrongProxyForHandle(flat->handle);
256                return finish_unflatten_binder(
257                    static_cast<BpBinder*>(out->get()), *flat, in);
258        }
259    }
260    return BAD_TYPE;
261}
262
263status_t unflatten_binder(const sp<ProcessState>& proc,
264    const Parcel& in, wp<IBinder>* out)
265{
266    const flat_binder_object* flat = in.readObject(false);
267
268    if (flat) {
269        switch (flat->type) {
270            case BINDER_TYPE_BINDER:
271                *out = reinterpret_cast<IBinder*>(flat->cookie);
272                return finish_unflatten_binder(NULL, *flat, in);
273            case BINDER_TYPE_WEAK_BINDER:
274                if (flat->binder != 0) {
275                    out->set_object_and_refs(
276                        reinterpret_cast<IBinder*>(flat->cookie),
277                        reinterpret_cast<RefBase::weakref_type*>(flat->binder));
278                } else {
279                    *out = NULL;
280                }
281                return finish_unflatten_binder(NULL, *flat, in);
282            case BINDER_TYPE_HANDLE:
283            case BINDER_TYPE_WEAK_HANDLE:
284                *out = proc->getWeakProxyForHandle(flat->handle);
285                return finish_unflatten_binder(
286                    static_cast<BpBinder*>(out->unsafe_get()), *flat, in);
287        }
288    }
289    return BAD_TYPE;
290}
291
292// ---------------------------------------------------------------------------
293
294Parcel::Parcel()
295{
296    initState();
297}
298
299Parcel::~Parcel()
300{
301    freeDataNoInit();
302}
303
304const uint8_t* Parcel::data() const
305{
306    return mData;
307}
308
309size_t Parcel::dataSize() const
310{
311    return (mDataSize > mDataPos ? mDataSize : mDataPos);
312}
313
314size_t Parcel::dataAvail() const
315{
316    // TODO: decide what to do about the possibility that this can
317    // report an available-data size that exceeds a Java int's max
318    // positive value, causing havoc.  Fortunately this will only
319    // happen if someone constructs a Parcel containing more than two
320    // gigabytes of data, which on typical phone hardware is simply
321    // not possible.
322    return dataSize() - dataPosition();
323}
324
325size_t Parcel::dataPosition() const
326{
327    return mDataPos;
328}
329
330size_t Parcel::dataCapacity() const
331{
332    return mDataCapacity;
333}
334
335status_t Parcel::setDataSize(size_t size)
336{
337    status_t err;
338    err = continueWrite(size);
339    if (err == NO_ERROR) {
340        mDataSize = size;
341        ALOGV("setDataSize Setting data size of %p to %zu", this, mDataSize);
342    }
343    return err;
344}
345
346void Parcel::setDataPosition(size_t pos) const
347{
348    mDataPos = pos;
349    mNextObjectHint = 0;
350}
351
352status_t Parcel::setDataCapacity(size_t size)
353{
354    if (size > mDataCapacity) return continueWrite(size);
355    return NO_ERROR;
356}
357
358status_t Parcel::setData(const uint8_t* buffer, size_t len)
359{
360    status_t err = restartWrite(len);
361    if (err == NO_ERROR) {
362        memcpy(const_cast<uint8_t*>(data()), buffer, len);
363        mDataSize = len;
364        mFdsKnown = false;
365    }
366    return err;
367}
368
369status_t Parcel::appendFrom(const Parcel *parcel, size_t offset, size_t len)
370{
371    const sp<ProcessState> proc(ProcessState::self());
372    status_t err;
373    const uint8_t *data = parcel->mData;
374    const binder_size_t *objects = parcel->mObjects;
375    size_t size = parcel->mObjectsSize;
376    int startPos = mDataPos;
377    int firstIndex = -1, lastIndex = -2;
378
379    if (len == 0) {
380        return NO_ERROR;
381    }
382
383    // range checks against the source parcel size
384    if ((offset > parcel->mDataSize)
385            || (len > parcel->mDataSize)
386            || (offset + len > parcel->mDataSize)) {
387        return BAD_VALUE;
388    }
389
390    // Count objects in range
391    for (int i = 0; i < (int) size; i++) {
392        size_t off = objects[i];
393        if ((off >= offset) && (off + sizeof(flat_binder_object) <= offset + len)) {
394            if (firstIndex == -1) {
395                firstIndex = i;
396            }
397            lastIndex = i;
398        }
399    }
400    int numObjects = lastIndex - firstIndex + 1;
401
402    if ((mDataSize+len) > mDataCapacity) {
403        // grow data
404        err = growData(len);
405        if (err != NO_ERROR) {
406            return err;
407        }
408    }
409
410    // append data
411    memcpy(mData + mDataPos, data + offset, len);
412    mDataPos += len;
413    mDataSize += len;
414
415    err = NO_ERROR;
416
417    if (numObjects > 0) {
418        // grow objects
419        if (mObjectsCapacity < mObjectsSize + numObjects) {
420            int newSize = ((mObjectsSize + numObjects)*3)/2;
421            binder_size_t *objects =
422                (binder_size_t*)realloc(mObjects, newSize*sizeof(binder_size_t));
423            if (objects == (binder_size_t*)0) {
424                return NO_MEMORY;
425            }
426            mObjects = objects;
427            mObjectsCapacity = newSize;
428        }
429
430        // append and acquire objects
431        int idx = mObjectsSize;
432        for (int i = firstIndex; i <= lastIndex; i++) {
433            size_t off = objects[i] - offset + startPos;
434            mObjects[idx++] = off;
435            mObjectsSize++;
436
437            flat_binder_object* flat
438                = reinterpret_cast<flat_binder_object*>(mData + off);
439            acquire_object(proc, *flat, this);
440
441            if (flat->type == BINDER_TYPE_FD) {
442                // If this is a file descriptor, we need to dup it so the
443                // new Parcel now owns its own fd, and can declare that we
444                // officially know we have fds.
445                flat->handle = dup(flat->handle);
446                flat->cookie = 1;
447                mHasFds = mFdsKnown = true;
448                if (!mAllowFds) {
449                    err = FDS_NOT_ALLOWED;
450                }
451            }
452        }
453    }
454
455    return err;
456}
457
458bool Parcel::pushAllowFds(bool allowFds)
459{
460    const bool origValue = mAllowFds;
461    if (!allowFds) {
462        mAllowFds = false;
463    }
464    return origValue;
465}
466
467void Parcel::restoreAllowFds(bool lastValue)
468{
469    mAllowFds = lastValue;
470}
471
472bool Parcel::hasFileDescriptors() const
473{
474    if (!mFdsKnown) {
475        scanForFds();
476    }
477    return mHasFds;
478}
479
480// Write RPC headers.  (previously just the interface token)
481status_t Parcel::writeInterfaceToken(const String16& interface)
482{
483    writeInt32(IPCThreadState::self()->getStrictModePolicy() |
484               STRICT_MODE_PENALTY_GATHER);
485    // currently the interface identification token is just its name as a string
486    return writeString16(interface);
487}
488
489bool Parcel::checkInterface(IBinder* binder) const
490{
491    return enforceInterface(binder->getInterfaceDescriptor());
492}
493
494bool Parcel::enforceInterface(const String16& interface,
495                              IPCThreadState* threadState) const
496{
497    int32_t strictPolicy = readInt32();
498    if (threadState == NULL) {
499        threadState = IPCThreadState::self();
500    }
501    if ((threadState->getLastTransactionBinderFlags() &
502         IBinder::FLAG_ONEWAY) != 0) {
503      // For one-way calls, the callee is running entirely
504      // disconnected from the caller, so disable StrictMode entirely.
505      // Not only does disk/network usage not impact the caller, but
506      // there's no way to commuicate back any violations anyway.
507      threadState->setStrictModePolicy(0);
508    } else {
509      threadState->setStrictModePolicy(strictPolicy);
510    }
511    const String16 str(readString16());
512    if (str == interface) {
513        return true;
514    } else {
515        ALOGW("**** enforceInterface() expected '%s' but read '%s'",
516                String8(interface).string(), String8(str).string());
517        return false;
518    }
519}
520
521const binder_size_t* Parcel::objects() const
522{
523    return mObjects;
524}
525
526size_t Parcel::objectsCount() const
527{
528    return mObjectsSize;
529}
530
531status_t Parcel::errorCheck() const
532{
533    return mError;
534}
535
536void Parcel::setError(status_t err)
537{
538    mError = err;
539}
540
541status_t Parcel::finishWrite(size_t len)
542{
543    //printf("Finish write of %d\n", len);
544    mDataPos += len;
545    ALOGV("finishWrite Setting data pos of %p to %zu", this, mDataPos);
546    if (mDataPos > mDataSize) {
547        mDataSize = mDataPos;
548        ALOGV("finishWrite Setting data size of %p to %zu", this, mDataSize);
549    }
550    //printf("New pos=%d, size=%d\n", mDataPos, mDataSize);
551    return NO_ERROR;
552}
553
554status_t Parcel::writeUnpadded(const void* data, size_t len)
555{
556    size_t end = mDataPos + len;
557    if (end < mDataPos) {
558        // integer overflow
559        return BAD_VALUE;
560    }
561
562    if (end <= mDataCapacity) {
563restart_write:
564        memcpy(mData+mDataPos, data, len);
565        return finishWrite(len);
566    }
567
568    status_t err = growData(len);
569    if (err == NO_ERROR) goto restart_write;
570    return err;
571}
572
573status_t Parcel::write(const void* data, size_t len)
574{
575    void* const d = writeInplace(len);
576    if (d) {
577        memcpy(d, data, len);
578        return NO_ERROR;
579    }
580    return mError;
581}
582
583void* Parcel::writeInplace(size_t len)
584{
585    const size_t padded = PAD_SIZE(len);
586
587    // sanity check for integer overflow
588    if (mDataPos+padded < mDataPos) {
589        return NULL;
590    }
591
592    if ((mDataPos+padded) <= mDataCapacity) {
593restart_write:
594        //printf("Writing %ld bytes, padded to %ld\n", len, padded);
595        uint8_t* const data = mData+mDataPos;
596
597        // Need to pad at end?
598        if (padded != len) {
599#if BYTE_ORDER == BIG_ENDIAN
600            static const uint32_t mask[4] = {
601                0x00000000, 0xffffff00, 0xffff0000, 0xff000000
602            };
603#endif
604#if BYTE_ORDER == LITTLE_ENDIAN
605            static const uint32_t mask[4] = {
606                0x00000000, 0x00ffffff, 0x0000ffff, 0x000000ff
607            };
608#endif
609            //printf("Applying pad mask: %p to %p\n", (void*)mask[padded-len],
610            //    *reinterpret_cast<void**>(data+padded-4));
611            *reinterpret_cast<uint32_t*>(data+padded-4) &= mask[padded-len];
612        }
613
614        finishWrite(padded);
615        return data;
616    }
617
618    status_t err = growData(padded);
619    if (err == NO_ERROR) goto restart_write;
620    return NULL;
621}
622
623status_t Parcel::writeInt32(int32_t val)
624{
625    return writeAligned(val);
626}
627status_t Parcel::writeInt32Array(size_t len, const int32_t *val) {
628    if (!val) {
629        return writeAligned(-1);
630    }
631    status_t ret = writeAligned(len);
632    if (ret == NO_ERROR) {
633        ret = write(val, len * sizeof(*val));
634    }
635    return ret;
636}
637status_t Parcel::writeByteArray(size_t len, const uint8_t *val) {
638    if (!val) {
639        return writeAligned(-1);
640    }
641    status_t ret = writeAligned(len);
642    if (ret == NO_ERROR) {
643        ret = write(val, len * sizeof(*val));
644    }
645    return ret;
646}
647
648status_t Parcel::writeInt64(int64_t val)
649{
650    return writeAligned(val);
651}
652
653status_t Parcel::writePointer(uintptr_t val)
654{
655    return writeAligned<binder_uintptr_t>(val);
656}
657
658status_t Parcel::writeFloat(float val)
659{
660    return writeAligned(val);
661}
662
663#if defined(__mips__) && defined(__mips_hard_float)
664
665status_t Parcel::writeDouble(double val)
666{
667    union {
668        double d;
669        unsigned long long ll;
670    } u;
671    u.d = val;
672    return writeAligned(u.ll);
673}
674
675#else
676
677status_t Parcel::writeDouble(double val)
678{
679    return writeAligned(val);
680}
681
682#endif
683
684status_t Parcel::writeCString(const char* str)
685{
686    return write(str, strlen(str)+1);
687}
688
689status_t Parcel::writeString8(const String8& str)
690{
691    status_t err = writeInt32(str.bytes());
692    // only write string if its length is more than zero characters,
693    // as readString8 will only read if the length field is non-zero.
694    // this is slightly different from how writeString16 works.
695    if (str.bytes() > 0 && err == NO_ERROR) {
696        err = write(str.string(), str.bytes()+1);
697    }
698    return err;
699}
700
701status_t Parcel::writeString16(const String16& str)
702{
703    return writeString16(str.string(), str.size());
704}
705
706status_t Parcel::writeString16(const char16_t* str, size_t len)
707{
708    if (str == NULL) return writeInt32(-1);
709
710    status_t err = writeInt32(len);
711    if (err == NO_ERROR) {
712        len *= sizeof(char16_t);
713        uint8_t* data = (uint8_t*)writeInplace(len+sizeof(char16_t));
714        if (data) {
715            memcpy(data, str, len);
716            *reinterpret_cast<char16_t*>(data+len) = 0;
717            return NO_ERROR;
718        }
719        err = mError;
720    }
721    return err;
722}
723
724status_t Parcel::writeStrongBinder(const sp<IBinder>& val)
725{
726    return flatten_binder(ProcessState::self(), val, this);
727}
728
729status_t Parcel::writeWeakBinder(const wp<IBinder>& val)
730{
731    return flatten_binder(ProcessState::self(), val, this);
732}
733
734status_t Parcel::writeNativeHandle(const native_handle* handle)
735{
736    if (!handle || handle->version != sizeof(native_handle))
737        return BAD_TYPE;
738
739    status_t err;
740    err = writeInt32(handle->numFds);
741    if (err != NO_ERROR) return err;
742
743    err = writeInt32(handle->numInts);
744    if (err != NO_ERROR) return err;
745
746    for (int i=0 ; err==NO_ERROR && i<handle->numFds ; i++)
747        err = writeDupFileDescriptor(handle->data[i]);
748
749    if (err != NO_ERROR) {
750        ALOGD("write native handle, write dup fd failed");
751        return err;
752    }
753    err = write(handle->data + handle->numFds, sizeof(int)*handle->numInts);
754    return err;
755}
756
757status_t Parcel::writeFileDescriptor(int fd, bool takeOwnership)
758{
759    flat_binder_object obj;
760    obj.type = BINDER_TYPE_FD;
761    obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS;
762    obj.binder = 0; /* Don't pass uninitialized stack data to a remote process */
763    obj.handle = fd;
764    obj.cookie = takeOwnership ? 1 : 0;
765    return writeObject(obj, true);
766}
767
768status_t Parcel::writeDupFileDescriptor(int fd)
769{
770    int dupFd = dup(fd);
771
772    {   // Temporary extra debug validation for b/17477219: a Parcel recipient is
773        // getting a positive but invalid fd unexpectedly. Trying to track down
774        // where it's coming from.
775        int dupErrno = dupFd < 0 ? errno : 0;
776        int fdFlags = fcntl(fd, F_GETFD);
777        int fdFlagsErrno = fdFlags == -1 ? errno : 0;
778        int dupFlags = fcntl(dupFd, F_GETFD);
779        int dupFlagsErrno = dupFlags == -1 ? errno : 0;
780        if (dupFd < 0 || fdFlags == -1 || dupFlags == -1) {
781            ALOGE("Parcel::writeDupFileDescriptor failed:\n"
782                    "  fd=%d flags=%d err=%d(%s)\n"
783                    "  dupFd=%d dupErr=%d(%s) flags=%d err=%d(%s)",
784                    fd, fdFlags, fdFlagsErrno, strerror(fdFlagsErrno),
785                    dupFd, dupErrno, strerror(dupErrno),
786                    dupFlags, dupFlagsErrno, strerror(dupFlagsErrno));
787            if (fd < 0 || fdFlags == -1) {
788                CallStack(LOG_TAG);
789            }
790            return -errno;
791        }
792    }
793
794    if (dupFd < 0) {
795        return -errno;
796    }
797    status_t err = writeFileDescriptor(dupFd, true /*takeOwnership*/);
798    if (err) {
799        close(dupFd);
800    }
801    return err;
802}
803
804// WARNING: This method must stay in sync with
805// Parcelable.Creator<ParcelFileDescriptor> CREATOR
806// in frameworks/base/core/java/android/os/ParcelFileDescriptor.java
807status_t Parcel::writeParcelFileDescriptor(int fd, int commChannel) {
808    status_t status;
809
810    if (fd < 0) {
811        status = writeInt32(0); // ParcelFileDescriptor is null
812        if (status) return status;
813    } else {
814        status = writeInt32(1); // ParcelFileDescriptor is not null
815        if (status) return status;
816        status = writeDupFileDescriptor(fd);
817        if (status) return status;
818        if (commChannel < 0) {
819            status = writeInt32(0); // commChannel is null
820            if (status) return status;
821        } else {
822            status = writeInt32(1); // commChannel is not null
823            if (status) return status;
824            status = writeDupFileDescriptor(commChannel);
825        }
826    }
827    return status;
828}
829
830status_t Parcel::writeBlob(size_t len, WritableBlob* outBlob)
831{
832    status_t status;
833
834    if (!mAllowFds || len <= IN_PLACE_BLOB_LIMIT) {
835        ALOGV("writeBlob: write in place");
836        status = writeInt32(0);
837        if (status) return status;
838
839        void* ptr = writeInplace(len);
840        if (!ptr) return NO_MEMORY;
841
842        outBlob->init(false /*mapped*/, ptr, len);
843        return NO_ERROR;
844    }
845
846    ALOGV("writeBlob: write to ashmem");
847    int fd = ashmem_create_region("Parcel Blob", len);
848    if (fd < 0) return NO_MEMORY;
849
850    int result = ashmem_set_prot_region(fd, PROT_READ | PROT_WRITE);
851    if (result < 0) {
852        status = result;
853    } else {
854        void* ptr = ::mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
855        if (ptr == MAP_FAILED) {
856            status = -errno;
857        } else {
858            result = ashmem_set_prot_region(fd, PROT_READ);
859            if (result < 0) {
860                status = result;
861            } else {
862                status = writeInt32(1);
863                if (!status) {
864                    status = writeFileDescriptor(fd, true /*takeOwnership*/);
865                    if (!status) {
866                        outBlob->init(true /*mapped*/, ptr, len);
867                        return NO_ERROR;
868                    }
869                }
870            }
871        }
872        ::munmap(ptr, len);
873    }
874    ::close(fd);
875    return status;
876}
877
878status_t Parcel::write(const FlattenableHelperInterface& val)
879{
880    status_t err;
881
882    // size if needed
883    const size_t len = val.getFlattenedSize();
884    const size_t fd_count = val.getFdCount();
885
886    err = this->writeInt32(len);
887    if (err) return err;
888
889    err = this->writeInt32(fd_count);
890    if (err) return err;
891
892    // payload
893    void* const buf = this->writeInplace(PAD_SIZE(len));
894    if (buf == NULL)
895        return BAD_VALUE;
896
897    int* fds = NULL;
898    if (fd_count) {
899        fds = new int[fd_count];
900    }
901
902    err = val.flatten(buf, len, fds, fd_count);
903    for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) {
904        err = this->writeDupFileDescriptor( fds[i] );
905    }
906
907    if (fd_count) {
908        delete [] fds;
909    }
910
911    return err;
912}
913
914status_t Parcel::writeObject(const flat_binder_object& val, bool nullMetaData)
915{
916    const bool enoughData = (mDataPos+sizeof(val)) <= mDataCapacity;
917    const bool enoughObjects = mObjectsSize < mObjectsCapacity;
918    if (enoughData && enoughObjects) {
919restart_write:
920        *reinterpret_cast<flat_binder_object*>(mData+mDataPos) = val;
921
922        // Need to write meta-data?
923        if (nullMetaData || val.binder != 0) {
924            mObjects[mObjectsSize] = mDataPos;
925            acquire_object(ProcessState::self(), val, this);
926            mObjectsSize++;
927        }
928
929        // remember if it's a file descriptor
930        if (val.type == BINDER_TYPE_FD) {
931            if (!mAllowFds) {
932                return FDS_NOT_ALLOWED;
933            }
934            mHasFds = mFdsKnown = true;
935        }
936
937        return finishWrite(sizeof(flat_binder_object));
938    }
939
940    if (!enoughData) {
941        const status_t err = growData(sizeof(val));
942        if (err != NO_ERROR) return err;
943    }
944    if (!enoughObjects) {
945        size_t newSize = ((mObjectsSize+2)*3)/2;
946        binder_size_t* objects = (binder_size_t*)realloc(mObjects, newSize*sizeof(binder_size_t));
947        if (objects == NULL) return NO_MEMORY;
948        mObjects = objects;
949        mObjectsCapacity = newSize;
950    }
951
952    goto restart_write;
953}
954
955status_t Parcel::writeNoException()
956{
957    return writeInt32(0);
958}
959
960void Parcel::remove(size_t /*start*/, size_t /*amt*/)
961{
962    LOG_ALWAYS_FATAL("Parcel::remove() not yet implemented!");
963}
964
965status_t Parcel::read(void* outData, size_t len) const
966{
967    if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize
968            && len <= PAD_SIZE(len)) {
969        memcpy(outData, mData+mDataPos, len);
970        mDataPos += PAD_SIZE(len);
971        ALOGV("read Setting data pos of %p to %zu", this, mDataPos);
972        return NO_ERROR;
973    }
974    return NOT_ENOUGH_DATA;
975}
976
977const void* Parcel::readInplace(size_t len) const
978{
979    if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize
980            && len <= PAD_SIZE(len)) {
981        const void* data = mData+mDataPos;
982        mDataPos += PAD_SIZE(len);
983        ALOGV("readInplace Setting data pos of %p to %zu", this, mDataPos);
984        return data;
985    }
986    return NULL;
987}
988
989template<class T>
990status_t Parcel::readAligned(T *pArg) const {
991    COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE(sizeof(T)) == sizeof(T));
992
993    if ((mDataPos+sizeof(T)) <= mDataSize) {
994        const void* data = mData+mDataPos;
995        mDataPos += sizeof(T);
996        *pArg =  *reinterpret_cast<const T*>(data);
997        return NO_ERROR;
998    } else {
999        return NOT_ENOUGH_DATA;
1000    }
1001}
1002
1003template<class T>
1004T Parcel::readAligned() const {
1005    T result;
1006    if (readAligned(&result) != NO_ERROR) {
1007        result = 0;
1008    }
1009
1010    return result;
1011}
1012
1013template<class T>
1014status_t Parcel::writeAligned(T val) {
1015    COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE(sizeof(T)) == sizeof(T));
1016
1017    if ((mDataPos+sizeof(val)) <= mDataCapacity) {
1018restart_write:
1019        *reinterpret_cast<T*>(mData+mDataPos) = val;
1020        return finishWrite(sizeof(val));
1021    }
1022
1023    status_t err = growData(sizeof(val));
1024    if (err == NO_ERROR) goto restart_write;
1025    return err;
1026}
1027
1028status_t Parcel::readInt32(int32_t *pArg) const
1029{
1030    return readAligned(pArg);
1031}
1032
1033int32_t Parcel::readInt32() const
1034{
1035    return readAligned<int32_t>();
1036}
1037
1038
1039status_t Parcel::readInt64(int64_t *pArg) const
1040{
1041    return readAligned(pArg);
1042}
1043
1044
1045int64_t Parcel::readInt64() const
1046{
1047    return readAligned<int64_t>();
1048}
1049
1050status_t Parcel::readPointer(uintptr_t *pArg) const
1051{
1052    status_t ret;
1053    binder_uintptr_t ptr;
1054    ret = readAligned(&ptr);
1055    if (!ret)
1056        *pArg = ptr;
1057    return ret;
1058}
1059
1060uintptr_t Parcel::readPointer() const
1061{
1062    return readAligned<binder_uintptr_t>();
1063}
1064
1065
1066status_t Parcel::readFloat(float *pArg) const
1067{
1068    return readAligned(pArg);
1069}
1070
1071
1072float Parcel::readFloat() const
1073{
1074    return readAligned<float>();
1075}
1076
1077#if defined(__mips__) && defined(__mips_hard_float)
1078
1079status_t Parcel::readDouble(double *pArg) const
1080{
1081    union {
1082      double d;
1083      unsigned long long ll;
1084    } u;
1085    u.d = 0;
1086    status_t status;
1087    status = readAligned(&u.ll);
1088    *pArg = u.d;
1089    return status;
1090}
1091
1092double Parcel::readDouble() const
1093{
1094    union {
1095      double d;
1096      unsigned long long ll;
1097    } u;
1098    u.ll = readAligned<unsigned long long>();
1099    return u.d;
1100}
1101
1102#else
1103
1104status_t Parcel::readDouble(double *pArg) const
1105{
1106    return readAligned(pArg);
1107}
1108
1109double Parcel::readDouble() const
1110{
1111    return readAligned<double>();
1112}
1113
1114#endif
1115
1116status_t Parcel::readIntPtr(intptr_t *pArg) const
1117{
1118    return readAligned(pArg);
1119}
1120
1121
1122intptr_t Parcel::readIntPtr() const
1123{
1124    return readAligned<intptr_t>();
1125}
1126
1127
1128const char* Parcel::readCString() const
1129{
1130    const size_t avail = mDataSize-mDataPos;
1131    if (avail > 0) {
1132        const char* str = reinterpret_cast<const char*>(mData+mDataPos);
1133        // is the string's trailing NUL within the parcel's valid bounds?
1134        const char* eos = reinterpret_cast<const char*>(memchr(str, 0, avail));
1135        if (eos) {
1136            const size_t len = eos - str;
1137            mDataPos += PAD_SIZE(len+1);
1138            ALOGV("readCString Setting data pos of %p to %zu", this, mDataPos);
1139            return str;
1140        }
1141    }
1142    return NULL;
1143}
1144
1145String8 Parcel::readString8() const
1146{
1147    int32_t size = readInt32();
1148    // watch for potential int overflow adding 1 for trailing NUL
1149    if (size > 0 && size < INT32_MAX) {
1150        const char* str = (const char*)readInplace(size+1);
1151        if (str) return String8(str, size);
1152    }
1153    return String8();
1154}
1155
1156String16 Parcel::readString16() const
1157{
1158    size_t len;
1159    const char16_t* str = readString16Inplace(&len);
1160    if (str) return String16(str, len);
1161    ALOGE("Reading a NULL string not supported here.");
1162    return String16();
1163}
1164
1165const char16_t* Parcel::readString16Inplace(size_t* outLen) const
1166{
1167    int32_t size = readInt32();
1168    // watch for potential int overflow from size+1
1169    if (size >= 0 && size < INT32_MAX) {
1170        *outLen = size;
1171        const char16_t* str = (const char16_t*)readInplace((size+1)*sizeof(char16_t));
1172        if (str != NULL) {
1173            return str;
1174        }
1175    }
1176    *outLen = 0;
1177    return NULL;
1178}
1179
1180sp<IBinder> Parcel::readStrongBinder() const
1181{
1182    sp<IBinder> val;
1183    unflatten_binder(ProcessState::self(), *this, &val);
1184    return val;
1185}
1186
1187wp<IBinder> Parcel::readWeakBinder() const
1188{
1189    wp<IBinder> val;
1190    unflatten_binder(ProcessState::self(), *this, &val);
1191    return val;
1192}
1193
1194int32_t Parcel::readExceptionCode() const
1195{
1196  int32_t exception_code = readAligned<int32_t>();
1197  if (exception_code == EX_HAS_REPLY_HEADER) {
1198    int32_t header_start = dataPosition();
1199    int32_t header_size = readAligned<int32_t>();
1200    // Skip over fat responses headers.  Not used (or propagated) in
1201    // native code
1202    setDataPosition(header_start + header_size);
1203    // And fat response headers are currently only used when there are no
1204    // exceptions, so return no error:
1205    return 0;
1206  }
1207  return exception_code;
1208}
1209
1210native_handle* Parcel::readNativeHandle() const
1211{
1212    int numFds, numInts;
1213    status_t err;
1214    err = readInt32(&numFds);
1215    if (err != NO_ERROR) return 0;
1216    err = readInt32(&numInts);
1217    if (err != NO_ERROR) return 0;
1218
1219    native_handle* h = native_handle_create(numFds, numInts);
1220    if (!h) {
1221        return 0;
1222    }
1223
1224    for (int i=0 ; err==NO_ERROR && i<numFds ; i++) {
1225        h->data[i] = dup(readFileDescriptor());
1226        if (h->data[i] < 0) {
1227            for (int j = 0; j < i; j++) {
1228                close(h->data[j]);
1229            }
1230            native_handle_delete(h);
1231            return 0;
1232        }
1233    }
1234    err = read(h->data + numFds, sizeof(int)*numInts);
1235    if (err != NO_ERROR) {
1236        native_handle_close(h);
1237        native_handle_delete(h);
1238        h = 0;
1239    }
1240    return h;
1241}
1242
1243
1244int Parcel::readFileDescriptor() const
1245{
1246    const flat_binder_object* flat = readObject(true);
1247    if (flat) {
1248        switch (flat->type) {
1249            case BINDER_TYPE_FD:
1250                //ALOGI("Returning file descriptor %ld from parcel %p", flat->handle, this);
1251                return flat->handle;
1252        }
1253    }
1254    return BAD_TYPE;
1255}
1256
1257// WARNING: This method must stay in sync with writeToParcel()
1258// in frameworks/base/core/java/android/os/ParcelFileDescriptor.java
1259int Parcel::readParcelFileDescriptor(int& outCommChannel) const {
1260    int fd;
1261    outCommChannel = -1;
1262
1263    if (readInt32() == 0) {
1264        fd = -1;
1265    } else {
1266        fd = readFileDescriptor();
1267        if (fd >= 0 && readInt32() != 0) {
1268            outCommChannel = readFileDescriptor();
1269        }
1270    }
1271    return fd;
1272}
1273
1274status_t Parcel::readBlob(size_t len, ReadableBlob* outBlob) const
1275{
1276    int32_t useAshmem;
1277    status_t status = readInt32(&useAshmem);
1278    if (status) return status;
1279
1280    if (!useAshmem) {
1281        ALOGV("readBlob: read in place");
1282        const void* ptr = readInplace(len);
1283        if (!ptr) return BAD_VALUE;
1284
1285        outBlob->init(false /*mapped*/, const_cast<void*>(ptr), len);
1286        return NO_ERROR;
1287    }
1288
1289    ALOGV("readBlob: read from ashmem");
1290    int fd = readFileDescriptor();
1291    if (fd == int(BAD_TYPE)) return BAD_VALUE;
1292
1293    void* ptr = ::mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0);
1294    if (ptr == MAP_FAILED) return NO_MEMORY;
1295
1296    outBlob->init(true /*mapped*/, ptr, len);
1297    return NO_ERROR;
1298}
1299
1300status_t Parcel::read(FlattenableHelperInterface& val) const
1301{
1302    // size
1303    const size_t len = this->readInt32();
1304    const size_t fd_count = this->readInt32();
1305
1306    // payload
1307    void const* const buf = this->readInplace(PAD_SIZE(len));
1308    if (buf == NULL)
1309        return BAD_VALUE;
1310
1311    int* fds = NULL;
1312    if (fd_count) {
1313        fds = new int[fd_count];
1314    }
1315
1316    status_t err = NO_ERROR;
1317    for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) {
1318        int oldfd = this->readFileDescriptor();
1319        fds[i] = dup(oldfd);
1320        if (fds[i] < 0) {
1321            int dupErrno = errno;
1322            err = BAD_VALUE;
1323            int flags = fcntl(oldfd, F_GETFD);
1324            int fcntlErrno = errno;
1325            const flat_binder_object* flat = readObject(true);
1326            ALOGE("dup failed in Parcel::read, fd %zu of %zu\n"
1327                "  dup(%d) = %d [errno: %d (%s)]\n"
1328                "  fcntl(%d, F_GETFD) = %d [errno: %d (%s)]\n"
1329                "  flat %p type %d",
1330                i, fd_count,
1331                oldfd, fds[i], dupErrno, strerror(dupErrno),
1332                oldfd, flags, fcntlErrno, strerror(fcntlErrno),
1333                flat, flat ? flat->type : 0);
1334            CallStack(LOG_TAG);
1335        }
1336    }
1337
1338    if (err == NO_ERROR) {
1339        err = val.unflatten(buf, len, fds, fd_count);
1340    }
1341
1342    if (fd_count) {
1343        delete [] fds;
1344    }
1345
1346    return err;
1347}
1348const flat_binder_object* Parcel::readObject(bool nullMetaData) const
1349{
1350    const size_t DPOS = mDataPos;
1351    if ((DPOS+sizeof(flat_binder_object)) <= mDataSize) {
1352        const flat_binder_object* obj
1353                = reinterpret_cast<const flat_binder_object*>(mData+DPOS);
1354        mDataPos = DPOS + sizeof(flat_binder_object);
1355        if (!nullMetaData && (obj->cookie == 0 && obj->binder == 0)) {
1356            // When transferring a NULL object, we don't write it into
1357            // the object list, so we don't want to check for it when
1358            // reading.
1359            ALOGV("readObject Setting data pos of %p to %zu", this, mDataPos);
1360            return obj;
1361        }
1362
1363        // Ensure that this object is valid...
1364        binder_size_t* const OBJS = mObjects;
1365        const size_t N = mObjectsSize;
1366        size_t opos = mNextObjectHint;
1367
1368        if (N > 0) {
1369            ALOGV("Parcel %p looking for obj at %zu, hint=%zu",
1370                 this, DPOS, opos);
1371
1372            // Start at the current hint position, looking for an object at
1373            // the current data position.
1374            if (opos < N) {
1375                while (opos < (N-1) && OBJS[opos] < DPOS) {
1376                    opos++;
1377                }
1378            } else {
1379                opos = N-1;
1380            }
1381            if (OBJS[opos] == DPOS) {
1382                // Found it!
1383                ALOGV("Parcel %p found obj %zu at index %zu with forward search",
1384                     this, DPOS, opos);
1385                mNextObjectHint = opos+1;
1386                ALOGV("readObject Setting data pos of %p to %zu", this, mDataPos);
1387                return obj;
1388            }
1389
1390            // Look backwards for it...
1391            while (opos > 0 && OBJS[opos] > DPOS) {
1392                opos--;
1393            }
1394            if (OBJS[opos] == DPOS) {
1395                // Found it!
1396                ALOGV("Parcel %p found obj %zu at index %zu with backward search",
1397                     this, DPOS, opos);
1398                mNextObjectHint = opos+1;
1399                ALOGV("readObject Setting data pos of %p to %zu", this, mDataPos);
1400                return obj;
1401            }
1402        }
1403        ALOGW("Attempt to read object from Parcel %p at offset %zu that is not in the object list",
1404             this, DPOS);
1405    }
1406    return NULL;
1407}
1408
1409void Parcel::closeFileDescriptors()
1410{
1411    size_t i = mObjectsSize;
1412    if (i > 0) {
1413        //ALOGI("Closing file descriptors for %zu objects...", i);
1414    }
1415    while (i > 0) {
1416        i--;
1417        const flat_binder_object* flat
1418            = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]);
1419        if (flat->type == BINDER_TYPE_FD) {
1420            //ALOGI("Closing fd: %ld", flat->handle);
1421            close(flat->handle);
1422        }
1423    }
1424}
1425
1426uintptr_t Parcel::ipcData() const
1427{
1428    return reinterpret_cast<uintptr_t>(mData);
1429}
1430
1431size_t Parcel::ipcDataSize() const
1432{
1433    return (mDataSize > mDataPos ? mDataSize : mDataPos);
1434}
1435
1436uintptr_t Parcel::ipcObjects() const
1437{
1438    return reinterpret_cast<uintptr_t>(mObjects);
1439}
1440
1441size_t Parcel::ipcObjectsCount() const
1442{
1443    return mObjectsSize;
1444}
1445
1446void Parcel::ipcSetDataReference(const uint8_t* data, size_t dataSize,
1447    const binder_size_t* objects, size_t objectsCount, release_func relFunc, void* relCookie)
1448{
1449    binder_size_t minOffset = 0;
1450    freeDataNoInit();
1451    mError = NO_ERROR;
1452    mData = const_cast<uint8_t*>(data);
1453    mDataSize = mDataCapacity = dataSize;
1454    //ALOGI("setDataReference Setting data size of %p to %lu (pid=%d)", this, mDataSize, getpid());
1455    mDataPos = 0;
1456    ALOGV("setDataReference Setting data pos of %p to %zu", this, mDataPos);
1457    mObjects = const_cast<binder_size_t*>(objects);
1458    mObjectsSize = mObjectsCapacity = objectsCount;
1459    mNextObjectHint = 0;
1460    mOwner = relFunc;
1461    mOwnerCookie = relCookie;
1462    for (size_t i = 0; i < mObjectsSize; i++) {
1463        binder_size_t offset = mObjects[i];
1464        if (offset < minOffset) {
1465            ALOGE("%s: bad object offset %"PRIu64" < %"PRIu64"\n",
1466                  __func__, (uint64_t)offset, (uint64_t)minOffset);
1467            mObjectsSize = 0;
1468            break;
1469        }
1470        minOffset = offset + sizeof(flat_binder_object);
1471    }
1472    scanForFds();
1473}
1474
1475void Parcel::print(TextOutput& to, uint32_t /*flags*/) const
1476{
1477    to << "Parcel(";
1478
1479    if (errorCheck() != NO_ERROR) {
1480        const status_t err = errorCheck();
1481        to << "Error: " << (void*)(intptr_t)err << " \"" << strerror(-err) << "\"";
1482    } else if (dataSize() > 0) {
1483        const uint8_t* DATA = data();
1484        to << indent << HexDump(DATA, dataSize()) << dedent;
1485        const binder_size_t* OBJS = objects();
1486        const size_t N = objectsCount();
1487        for (size_t i=0; i<N; i++) {
1488            const flat_binder_object* flat
1489                = reinterpret_cast<const flat_binder_object*>(DATA+OBJS[i]);
1490            to << endl << "Object #" << i << " @ " << (void*)OBJS[i] << ": "
1491                << TypeCode(flat->type & 0x7f7f7f00)
1492                << " = " << flat->binder;
1493        }
1494    } else {
1495        to << "NULL";
1496    }
1497
1498    to << ")";
1499}
1500
1501void Parcel::releaseObjects()
1502{
1503    const sp<ProcessState> proc(ProcessState::self());
1504    size_t i = mObjectsSize;
1505    uint8_t* const data = mData;
1506    binder_size_t* const objects = mObjects;
1507    while (i > 0) {
1508        i--;
1509        const flat_binder_object* flat
1510            = reinterpret_cast<flat_binder_object*>(data+objects[i]);
1511        release_object(proc, *flat, this);
1512    }
1513}
1514
1515void Parcel::acquireObjects()
1516{
1517    const sp<ProcessState> proc(ProcessState::self());
1518    size_t i = mObjectsSize;
1519    uint8_t* const data = mData;
1520    binder_size_t* const objects = mObjects;
1521    while (i > 0) {
1522        i--;
1523        const flat_binder_object* flat
1524            = reinterpret_cast<flat_binder_object*>(data+objects[i]);
1525        acquire_object(proc, *flat, this);
1526    }
1527}
1528
1529void Parcel::freeData()
1530{
1531    freeDataNoInit();
1532    initState();
1533}
1534
1535void Parcel::freeDataNoInit()
1536{
1537    if (mOwner) {
1538        //ALOGI("Freeing data ref of %p (pid=%d)", this, getpid());
1539        mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie);
1540    } else {
1541        releaseObjects();
1542        if (mData) free(mData);
1543        if (mObjects) free(mObjects);
1544    }
1545}
1546
1547status_t Parcel::growData(size_t len)
1548{
1549    size_t newSize = ((mDataSize+len)*3)/2;
1550    return (newSize <= mDataSize)
1551            ? (status_t) NO_MEMORY
1552            : continueWrite(newSize);
1553}
1554
1555status_t Parcel::restartWrite(size_t desired)
1556{
1557    if (mOwner) {
1558        freeData();
1559        return continueWrite(desired);
1560    }
1561
1562    uint8_t* data = (uint8_t*)realloc(mData, desired);
1563    if (!data && desired > mDataCapacity) {
1564        mError = NO_MEMORY;
1565        return NO_MEMORY;
1566    }
1567
1568    releaseObjects();
1569
1570    if (data) {
1571        mData = data;
1572        mDataCapacity = desired;
1573    }
1574
1575    mDataSize = mDataPos = 0;
1576    ALOGV("restartWrite Setting data size of %p to %zu", this, mDataSize);
1577    ALOGV("restartWrite Setting data pos of %p to %zu", this, mDataPos);
1578
1579    free(mObjects);
1580    mObjects = NULL;
1581    mObjectsSize = mObjectsCapacity = 0;
1582    mNextObjectHint = 0;
1583    mHasFds = false;
1584    mFdsKnown = true;
1585    mAllowFds = true;
1586
1587    return NO_ERROR;
1588}
1589
1590status_t Parcel::continueWrite(size_t desired)
1591{
1592    // If shrinking, first adjust for any objects that appear
1593    // after the new data size.
1594    size_t objectsSize = mObjectsSize;
1595    if (desired < mDataSize) {
1596        if (desired == 0) {
1597            objectsSize = 0;
1598        } else {
1599            while (objectsSize > 0) {
1600                if (mObjects[objectsSize-1] < desired)
1601                    break;
1602                objectsSize--;
1603            }
1604        }
1605    }
1606
1607    if (mOwner) {
1608        // If the size is going to zero, just release the owner's data.
1609        if (desired == 0) {
1610            freeData();
1611            return NO_ERROR;
1612        }
1613
1614        // If there is a different owner, we need to take
1615        // posession.
1616        uint8_t* data = (uint8_t*)malloc(desired);
1617        if (!data) {
1618            mError = NO_MEMORY;
1619            return NO_MEMORY;
1620        }
1621        binder_size_t* objects = NULL;
1622
1623        if (objectsSize) {
1624            objects = (binder_size_t*)malloc(objectsSize*sizeof(binder_size_t));
1625            if (!objects) {
1626                free(data);
1627
1628                mError = NO_MEMORY;
1629                return NO_MEMORY;
1630            }
1631
1632            // Little hack to only acquire references on objects
1633            // we will be keeping.
1634            size_t oldObjectsSize = mObjectsSize;
1635            mObjectsSize = objectsSize;
1636            acquireObjects();
1637            mObjectsSize = oldObjectsSize;
1638        }
1639
1640        if (mData) {
1641            memcpy(data, mData, mDataSize < desired ? mDataSize : desired);
1642        }
1643        if (objects && mObjects) {
1644            memcpy(objects, mObjects, objectsSize*sizeof(binder_size_t));
1645        }
1646        //ALOGI("Freeing data ref of %p (pid=%d)", this, getpid());
1647        mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie);
1648        mOwner = NULL;
1649
1650        mData = data;
1651        mObjects = objects;
1652        mDataSize = (mDataSize < desired) ? mDataSize : desired;
1653        ALOGV("continueWrite Setting data size of %p to %zu", this, mDataSize);
1654        mDataCapacity = desired;
1655        mObjectsSize = mObjectsCapacity = objectsSize;
1656        mNextObjectHint = 0;
1657
1658    } else if (mData) {
1659        if (objectsSize < mObjectsSize) {
1660            // Need to release refs on any objects we are dropping.
1661            const sp<ProcessState> proc(ProcessState::self());
1662            for (size_t i=objectsSize; i<mObjectsSize; i++) {
1663                const flat_binder_object* flat
1664                    = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]);
1665                if (flat->type == BINDER_TYPE_FD) {
1666                    // will need to rescan because we may have lopped off the only FDs
1667                    mFdsKnown = false;
1668                }
1669                release_object(proc, *flat, this);
1670            }
1671            binder_size_t* objects =
1672                (binder_size_t*)realloc(mObjects, objectsSize*sizeof(binder_size_t));
1673            if (objects) {
1674                mObjects = objects;
1675            }
1676            mObjectsSize = objectsSize;
1677            mNextObjectHint = 0;
1678        }
1679
1680        // We own the data, so we can just do a realloc().
1681        if (desired > mDataCapacity) {
1682            uint8_t* data = (uint8_t*)realloc(mData, desired);
1683            if (data) {
1684                mData = data;
1685                mDataCapacity = desired;
1686            } else if (desired > mDataCapacity) {
1687                mError = NO_MEMORY;
1688                return NO_MEMORY;
1689            }
1690        } else {
1691            if (mDataSize > desired) {
1692                mDataSize = desired;
1693                ALOGV("continueWrite Setting data size of %p to %zu", this, mDataSize);
1694            }
1695            if (mDataPos > desired) {
1696                mDataPos = desired;
1697                ALOGV("continueWrite Setting data pos of %p to %zu", this, mDataPos);
1698            }
1699        }
1700
1701    } else {
1702        // This is the first data.  Easy!
1703        uint8_t* data = (uint8_t*)malloc(desired);
1704        if (!data) {
1705            mError = NO_MEMORY;
1706            return NO_MEMORY;
1707        }
1708
1709        if(!(mDataCapacity == 0 && mObjects == NULL
1710             && mObjectsCapacity == 0)) {
1711            ALOGE("continueWrite: %zu/%p/%zu/%zu", mDataCapacity, mObjects, mObjectsCapacity, desired);
1712        }
1713
1714        mData = data;
1715        mDataSize = mDataPos = 0;
1716        ALOGV("continueWrite Setting data size of %p to %zu", this, mDataSize);
1717        ALOGV("continueWrite Setting data pos of %p to %zu", this, mDataPos);
1718        mDataCapacity = desired;
1719    }
1720
1721    return NO_ERROR;
1722}
1723
1724void Parcel::initState()
1725{
1726    mError = NO_ERROR;
1727    mData = 0;
1728    mDataSize = 0;
1729    mDataCapacity = 0;
1730    mDataPos = 0;
1731    ALOGV("initState Setting data size of %p to %zu", this, mDataSize);
1732    ALOGV("initState Setting data pos of %p to %zu", this, mDataPos);
1733    mObjects = NULL;
1734    mObjectsSize = 0;
1735    mObjectsCapacity = 0;
1736    mNextObjectHint = 0;
1737    mHasFds = false;
1738    mFdsKnown = true;
1739    mAllowFds = true;
1740    mOwner = NULL;
1741}
1742
1743void Parcel::scanForFds() const
1744{
1745    bool hasFds = false;
1746    for (size_t i=0; i<mObjectsSize; i++) {
1747        const flat_binder_object* flat
1748            = reinterpret_cast<const flat_binder_object*>(mData + mObjects[i]);
1749        if (flat->type == BINDER_TYPE_FD) {
1750            hasFds = true;
1751            break;
1752        }
1753    }
1754    mHasFds = hasFds;
1755    mFdsKnown = true;
1756}
1757
1758// --- Parcel::Blob ---
1759
1760Parcel::Blob::Blob() :
1761        mMapped(false), mData(NULL), mSize(0) {
1762}
1763
1764Parcel::Blob::~Blob() {
1765    release();
1766}
1767
1768void Parcel::Blob::release() {
1769    if (mMapped && mData) {
1770        ::munmap(mData, mSize);
1771    }
1772    clear();
1773}
1774
1775void Parcel::Blob::init(bool mapped, void* data, size_t size) {
1776    mMapped = mapped;
1777    mData = data;
1778    mSize = size;
1779}
1780
1781void Parcel::Blob::clear() {
1782    mMapped = false;
1783    mData = NULL;
1784    mSize = 0;
1785}
1786
1787}; // namespace android
1788