Parcel.cpp revision 5b61ad2cda8ec8ab634ce02f388bb2d3c5ab048d
1467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski/*
2467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski * Copyright (C) 2005 The Android Open Source Project
3467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski *
4467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski * Licensed under the Apache License, Version 2.0 (the "License");
5467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski * you may not use this file except in compliance with the License.
6467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski * You may obtain a copy of the License at
7467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski *
8467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski *      http://www.apache.org/licenses/LICENSE-2.0
9467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski *
10467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski * Unless required by applicable law or agreed to in writing, software
11467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski * distributed under the License is distributed on an "AS IS" BASIS,
12467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski * See the License for the specific language governing permissions and
14467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski * limitations under the License.
15467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski */
16467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski
17467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski#define LOG_TAG "Parcel"
18467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski//#define LOG_NDEBUG 0
19467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski
20467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski#include <binder/Parcel.h>
21467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski
22467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski#include <binder/IPCThreadState.h>
23467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski#include <binder/Binder.h>
24467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski#include <binder/BpBinder.h>
25467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski#include <binder/ProcessState.h>
26467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski#include <binder/TextOutput.h>
27467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski
28467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski#include <utils/Debug.h>
29467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski#include <utils/Log.h>
30467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski#include <utils/String8.h>
31467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski#include <utils/String16.h>
32467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski#include <utils/misc.h>
33467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski#include <utils/Flattenable.h>
34467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski#include <cutils/ashmem.h>
35467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski
36467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski#include <private/binder/binder_module.h>
37467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski
38467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski#include <inttypes.h>
39467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski#include <stdio.h>
40467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski#include <stdlib.h>
41467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski#include <stdint.h>
42467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski#include <sys/mman.h>
43467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski
44467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski#ifndef INT32_MAX
45467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski#define INT32_MAX ((int32_t)(2147483647))
46467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski#endif
47467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski
48467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski#define LOG_REFS(...)
49467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski//#define LOG_REFS(...) ALOG(LOG_DEBUG, "Parcel", __VA_ARGS__)
50467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski
51467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski// ---------------------------------------------------------------------------
52467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski
53467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski#define PAD_SIZE(s) (((s)+3)&~3)
54467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski
55467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski// Note: must be kept in sync with android/os/StrictMode.java's PENALTY_GATHER
56467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski#define STRICT_MODE_PENALTY_GATHER 0x100
57467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski
58467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski// Note: must be kept in sync with android/os/Parcel.java's EX_HAS_REPLY_HEADER
59467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski#define EX_HAS_REPLY_HEADER -128
60467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski
61467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski// Maximum size of a blob to transfer in-place.
62467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinskistatic const size_t IN_PLACE_BLOB_LIMIT = 40 * 1024;
63467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski
64467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski// XXX This can be made public if we want to provide
65467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski// support for typed data.
66467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinskistruct small_flat_data
67467f171315f9c2037fcd3eb5edcfabc40671bf7bAdam Lesinski{
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                static_cast<IBinder*>(obj.cookie)->incStrong(who);
82            }
83            return;
84        case BINDER_TYPE_WEAK_BINDER:
85            if (obj.binder)
86                static_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%08lx", 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                static_cast<IBinder*>(obj.cookie)->decStrong(who);
119            }
120            return;
121        case BINDER_TYPE_WEAK_BINDER:
122            if (obj.binder)
123                static_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 != (void*)0) close(obj.handle);
140            return;
141        }
142    }
143
144    ALOGE("Invalid object type 0x%08lx", 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 = NULL;
170        } else {
171            obj.type = BINDER_TYPE_BINDER;
172            obj.binder = local->getWeakRefs();
173            obj.cookie = local;
174        }
175    } else {
176        obj.type = BINDER_TYPE_BINDER;
177        obj.binder = NULL;
178        obj.cookie = NULL;
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 = NULL;
203            } else {
204                obj.type = BINDER_TYPE_WEAK_BINDER;
205                obj.binder = binder.get_refs();
206                obj.cookie = 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 = NULL;
221        obj.cookie = NULL;
222        return finish_flatten_binder(NULL, obj, out);
223
224    } else {
225        obj.type = BINDER_TYPE_BINDER;
226        obj.binder = NULL;
227        obj.cookie = NULL;
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, const Parcel& in)
234{
235    return NO_ERROR;
236}
237
238status_t unflatten_binder(const sp<ProcessState>& proc,
239    const Parcel& in, sp<IBinder>* out)
240{
241    const flat_binder_object* flat = in.readObject(false);
242
243    if (flat) {
244        switch (flat->type) {
245            case BINDER_TYPE_BINDER:
246                *out = static_cast<IBinder*>(flat->cookie);
247                return finish_unflatten_binder(NULL, *flat, in);
248            case BINDER_TYPE_HANDLE:
249                *out = proc->getStrongProxyForHandle(flat->handle);
250                return finish_unflatten_binder(
251                    static_cast<BpBinder*>(out->get()), *flat, in);
252        }
253    }
254    return BAD_TYPE;
255}
256
257status_t unflatten_binder(const sp<ProcessState>& proc,
258    const Parcel& in, wp<IBinder>* out)
259{
260    const flat_binder_object* flat = in.readObject(false);
261
262    if (flat) {
263        switch (flat->type) {
264            case BINDER_TYPE_BINDER:
265                *out = static_cast<IBinder*>(flat->cookie);
266                return finish_unflatten_binder(NULL, *flat, in);
267            case BINDER_TYPE_WEAK_BINDER:
268                if (flat->binder != NULL) {
269                    out->set_object_and_refs(
270                        static_cast<IBinder*>(flat->cookie),
271                        static_cast<RefBase::weakref_type*>(flat->binder));
272                } else {
273                    *out = NULL;
274                }
275                return finish_unflatten_binder(NULL, *flat, in);
276            case BINDER_TYPE_HANDLE:
277            case BINDER_TYPE_WEAK_HANDLE:
278                *out = proc->getWeakProxyForHandle(flat->handle);
279                return finish_unflatten_binder(
280                    static_cast<BpBinder*>(out->unsafe_get()), *flat, in);
281        }
282    }
283    return BAD_TYPE;
284}
285
286// ---------------------------------------------------------------------------
287
288Parcel::Parcel()
289{
290    initState();
291}
292
293Parcel::~Parcel()
294{
295    freeDataNoInit();
296}
297
298const uint8_t* Parcel::data() const
299{
300    return mData;
301}
302
303size_t Parcel::dataSize() const
304{
305    return (mDataSize > mDataPos ? mDataSize : mDataPos);
306}
307
308size_t Parcel::dataAvail() const
309{
310    // TODO: decide what to do about the possibility that this can
311    // report an available-data size that exceeds a Java int's max
312    // positive value, causing havoc.  Fortunately this will only
313    // happen if someone constructs a Parcel containing more than two
314    // gigabytes of data, which on typical phone hardware is simply
315    // not possible.
316    return dataSize() - dataPosition();
317}
318
319size_t Parcel::dataPosition() const
320{
321    return mDataPos;
322}
323
324size_t Parcel::dataCapacity() const
325{
326    return mDataCapacity;
327}
328
329status_t Parcel::setDataSize(size_t size)
330{
331    status_t err;
332    err = continueWrite(size);
333    if (err == NO_ERROR) {
334        mDataSize = size;
335        ALOGV("setDataSize Setting data size of %p to %d\n", this, mDataSize);
336    }
337    return err;
338}
339
340void Parcel::setDataPosition(size_t pos) const
341{
342    mDataPos = pos;
343    mNextObjectHint = 0;
344}
345
346status_t Parcel::setDataCapacity(size_t size)
347{
348    if (size > mDataCapacity) return continueWrite(size);
349    return NO_ERROR;
350}
351
352status_t Parcel::setData(const uint8_t* buffer, size_t len)
353{
354    status_t err = restartWrite(len);
355    if (err == NO_ERROR) {
356        memcpy(const_cast<uint8_t*>(data()), buffer, len);
357        mDataSize = len;
358        mFdsKnown = false;
359    }
360    return err;
361}
362
363status_t Parcel::appendFrom(const Parcel *parcel, size_t offset, size_t len)
364{
365    const sp<ProcessState> proc(ProcessState::self());
366    status_t err;
367    const uint8_t *data = parcel->mData;
368    const size_t *objects = parcel->mObjects;
369    size_t size = parcel->mObjectsSize;
370    int startPos = mDataPos;
371    int firstIndex = -1, lastIndex = -2;
372
373    if (len == 0) {
374        return NO_ERROR;
375    }
376
377    // range checks against the source parcel size
378    if ((offset > parcel->mDataSize)
379            || (len > parcel->mDataSize)
380            || (offset + len > parcel->mDataSize)) {
381        return BAD_VALUE;
382    }
383
384    // Count objects in range
385    for (int i = 0; i < (int) size; i++) {
386        size_t off = objects[i];
387        if ((off >= offset) && (off < offset + len)) {
388            if (firstIndex == -1) {
389                firstIndex = i;
390            }
391            lastIndex = i;
392        }
393    }
394    int numObjects = lastIndex - firstIndex + 1;
395
396    if ((mDataSize+len) > mDataCapacity) {
397        // grow data
398        err = growData(len);
399        if (err != NO_ERROR) {
400            return err;
401        }
402    }
403
404    // append data
405    memcpy(mData + mDataPos, data + offset, len);
406    mDataPos += len;
407    mDataSize += len;
408
409    err = NO_ERROR;
410
411    if (numObjects > 0) {
412        // grow objects
413        if (mObjectsCapacity < mObjectsSize + numObjects) {
414            int newSize = ((mObjectsSize + numObjects)*3)/2;
415            size_t *objects =
416                (size_t*)realloc(mObjects, newSize*sizeof(size_t));
417            if (objects == (size_t*)0) {
418                return NO_MEMORY;
419            }
420            mObjects = objects;
421            mObjectsCapacity = newSize;
422        }
423
424        // append and acquire objects
425        int idx = mObjectsSize;
426        for (int i = firstIndex; i <= lastIndex; i++) {
427            size_t off = objects[i] - offset + startPos;
428            mObjects[idx++] = off;
429            mObjectsSize++;
430
431            flat_binder_object* flat
432                = reinterpret_cast<flat_binder_object*>(mData + off);
433            acquire_object(proc, *flat, this);
434
435            if (flat->type == BINDER_TYPE_FD) {
436                // If this is a file descriptor, we need to dup it so the
437                // new Parcel now owns its own fd, and can declare that we
438                // officially know we have fds.
439                flat->handle = dup(flat->handle);
440                flat->cookie = (void*)1;
441                mHasFds = mFdsKnown = true;
442                if (!mAllowFds) {
443                    err = FDS_NOT_ALLOWED;
444                }
445            }
446        }
447    }
448
449    return err;
450}
451
452bool Parcel::pushAllowFds(bool allowFds)
453{
454    const bool origValue = mAllowFds;
455    if (!allowFds) {
456        mAllowFds = false;
457    }
458    return origValue;
459}
460
461void Parcel::restoreAllowFds(bool lastValue)
462{
463    mAllowFds = lastValue;
464}
465
466bool Parcel::hasFileDescriptors() const
467{
468    if (!mFdsKnown) {
469        scanForFds();
470    }
471    return mHasFds;
472}
473
474// Write RPC headers.  (previously just the interface token)
475status_t Parcel::writeInterfaceToken(const String16& interface)
476{
477    writeInt32(IPCThreadState::self()->getStrictModePolicy() |
478               STRICT_MODE_PENALTY_GATHER);
479    // currently the interface identification token is just its name as a string
480    return writeString16(interface);
481}
482
483bool Parcel::checkInterface(IBinder* binder) const
484{
485    return enforceInterface(binder->getInterfaceDescriptor());
486}
487
488bool Parcel::enforceInterface(const String16& interface,
489                              IPCThreadState* threadState) const
490{
491    int32_t strictPolicy = readInt32();
492    if (threadState == NULL) {
493        threadState = IPCThreadState::self();
494    }
495    if ((threadState->getLastTransactionBinderFlags() &
496         IBinder::FLAG_ONEWAY) != 0) {
497      // For one-way calls, the callee is running entirely
498      // disconnected from the caller, so disable StrictMode entirely.
499      // Not only does disk/network usage not impact the caller, but
500      // there's no way to commuicate back any violations anyway.
501      threadState->setStrictModePolicy(0);
502    } else {
503      threadState->setStrictModePolicy(strictPolicy);
504    }
505    const String16 str(readString16());
506    if (str == interface) {
507        return true;
508    } else {
509        ALOGW("**** enforceInterface() expected '%s' but read '%s'\n",
510                String8(interface).string(), String8(str).string());
511        return false;
512    }
513}
514
515const size_t* Parcel::objects() const
516{
517    return mObjects;
518}
519
520size_t Parcel::objectsCount() const
521{
522    return mObjectsSize;
523}
524
525status_t Parcel::errorCheck() const
526{
527    return mError;
528}
529
530void Parcel::setError(status_t err)
531{
532    mError = err;
533}
534
535status_t Parcel::finishWrite(size_t len)
536{
537    //printf("Finish write of %d\n", len);
538    mDataPos += len;
539    ALOGV("finishWrite Setting data pos of %p to %d\n", this, mDataPos);
540    if (mDataPos > mDataSize) {
541        mDataSize = mDataPos;
542        ALOGV("finishWrite Setting data size of %p to %d\n", this, mDataSize);
543    }
544    //printf("New pos=%d, size=%d\n", mDataPos, mDataSize);
545    return NO_ERROR;
546}
547
548status_t Parcel::writeUnpadded(const void* data, size_t len)
549{
550    size_t end = mDataPos + len;
551    if (end < mDataPos) {
552        // integer overflow
553        return BAD_VALUE;
554    }
555
556    if (end <= mDataCapacity) {
557restart_write:
558        memcpy(mData+mDataPos, data, len);
559        return finishWrite(len);
560    }
561
562    status_t err = growData(len);
563    if (err == NO_ERROR) goto restart_write;
564    return err;
565}
566
567status_t Parcel::write(const void* data, size_t len)
568{
569    void* const d = writeInplace(len);
570    if (d) {
571        memcpy(d, data, len);
572        return NO_ERROR;
573    }
574    return mError;
575}
576
577void* Parcel::writeInplace(size_t len)
578{
579    const size_t padded = PAD_SIZE(len);
580
581    // sanity check for integer overflow
582    if (mDataPos+padded < mDataPos) {
583        return NULL;
584    }
585
586    if ((mDataPos+padded) <= mDataCapacity) {
587restart_write:
588        //printf("Writing %ld bytes, padded to %ld\n", len, padded);
589        uint8_t* const data = mData+mDataPos;
590
591        // Need to pad at end?
592        if (padded != len) {
593#if BYTE_ORDER == BIG_ENDIAN
594            static const uint32_t mask[4] = {
595                0x00000000, 0xffffff00, 0xffff0000, 0xff000000
596            };
597#endif
598#if BYTE_ORDER == LITTLE_ENDIAN
599            static const uint32_t mask[4] = {
600                0x00000000, 0x00ffffff, 0x0000ffff, 0x000000ff
601            };
602#endif
603            //printf("Applying pad mask: %p to %p\n", (void*)mask[padded-len],
604            //    *reinterpret_cast<void**>(data+padded-4));
605            *reinterpret_cast<uint32_t*>(data+padded-4) &= mask[padded-len];
606        }
607
608        finishWrite(padded);
609        return data;
610    }
611
612    status_t err = growData(padded);
613    if (err == NO_ERROR) goto restart_write;
614    return NULL;
615}
616
617status_t Parcel::writeInt32(int32_t val)
618{
619    return writeAligned(val);
620}
621status_t Parcel::writeInt32Array(size_t len, const int32_t *val) {
622    if (!val) {
623        return writeAligned(-1);
624    }
625    status_t ret = writeAligned(len);
626    if (ret == NO_ERROR) {
627        ret = write(val, len * sizeof(*val));
628    }
629    return ret;
630}
631status_t Parcel::writeByteArray(size_t len, const uint8_t *val) {
632    if (!val) {
633        return writeAligned(-1);
634    }
635    status_t ret = writeAligned(len);
636    if (ret == NO_ERROR) {
637        ret = write(val, len * sizeof(*val));
638    }
639    return ret;
640}
641
642status_t Parcel::writeInt64(int64_t val)
643{
644    return writeAligned(val);
645}
646
647status_t Parcel::writeFloat(float val)
648{
649    return writeAligned(val);
650}
651
652#if defined(__mips__) && defined(__mips_hard_float)
653
654status_t Parcel::writeDouble(double val)
655{
656    union {
657        double d;
658        unsigned long long ll;
659    } u;
660    u.d = val;
661    return writeAligned(u.ll);
662}
663
664#else
665
666status_t Parcel::writeDouble(double val)
667{
668    return writeAligned(val);
669}
670
671#endif
672
673status_t Parcel::writeIntPtr(intptr_t val)
674{
675    return writeAligned(val);
676}
677
678status_t Parcel::writeCString(const char* str)
679{
680    return write(str, strlen(str)+1);
681}
682
683status_t Parcel::writeString8(const String8& str)
684{
685    status_t err = writeInt32(str.bytes());
686    // only write string if its length is more than zero characters,
687    // as readString8 will only read if the length field is non-zero.
688    // this is slightly different from how writeString16 works.
689    if (str.bytes() > 0 && err == NO_ERROR) {
690        err = write(str.string(), str.bytes()+1);
691    }
692    return err;
693}
694
695status_t Parcel::writeString16(const String16& str)
696{
697    return writeString16(str.string(), str.size());
698}
699
700status_t Parcel::writeString16(const char16_t* str, size_t len)
701{
702    if (str == NULL) return writeInt32(-1);
703
704    status_t err = writeInt32(len);
705    if (err == NO_ERROR) {
706        len *= sizeof(char16_t);
707        uint8_t* data = (uint8_t*)writeInplace(len+sizeof(char16_t));
708        if (data) {
709            memcpy(data, str, len);
710            *reinterpret_cast<char16_t*>(data+len) = 0;
711            return NO_ERROR;
712        }
713        err = mError;
714    }
715    return err;
716}
717
718status_t Parcel::writeStrongBinder(const sp<IBinder>& val)
719{
720    return flatten_binder(ProcessState::self(), val, this);
721}
722
723status_t Parcel::writeWeakBinder(const wp<IBinder>& val)
724{
725    return flatten_binder(ProcessState::self(), val, this);
726}
727
728status_t Parcel::writeNativeHandle(const native_handle* handle)
729{
730    if (!handle || handle->version != sizeof(native_handle))
731        return BAD_TYPE;
732
733    status_t err;
734    err = writeInt32(handle->numFds);
735    if (err != NO_ERROR) return err;
736
737    err = writeInt32(handle->numInts);
738    if (err != NO_ERROR) return err;
739
740    for (int i=0 ; err==NO_ERROR && i<handle->numFds ; i++)
741        err = writeDupFileDescriptor(handle->data[i]);
742
743    if (err != NO_ERROR) {
744        ALOGD("write native handle, write dup fd failed");
745        return err;
746    }
747    err = write(handle->data + handle->numFds, sizeof(int)*handle->numInts);
748    return err;
749}
750
751status_t Parcel::writeFileDescriptor(int fd, bool takeOwnership)
752{
753    flat_binder_object obj;
754    obj.type = BINDER_TYPE_FD;
755    obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS;
756    obj.handle = fd;
757    obj.cookie = (void*) (takeOwnership ? 1 : 0);
758    return writeObject(obj, true);
759}
760
761status_t Parcel::writeDupFileDescriptor(int fd)
762{
763    int dupFd = dup(fd);
764    if (dupFd < 0) {
765        return -errno;
766    }
767    status_t err = writeFileDescriptor(dupFd, true /*takeOwnership*/);
768    if (err) {
769        close(dupFd);
770    }
771    return err;
772}
773
774status_t Parcel::writeBlob(size_t len, WritableBlob* outBlob)
775{
776    status_t status;
777
778    if (!mAllowFds || len <= IN_PLACE_BLOB_LIMIT) {
779        ALOGV("writeBlob: write in place");
780        status = writeInt32(0);
781        if (status) return status;
782
783        void* ptr = writeInplace(len);
784        if (!ptr) return NO_MEMORY;
785
786        outBlob->init(false /*mapped*/, ptr, len);
787        return NO_ERROR;
788    }
789
790    ALOGV("writeBlob: write to ashmem");
791    int fd = ashmem_create_region("Parcel Blob", len);
792    if (fd < 0) return NO_MEMORY;
793
794    int result = ashmem_set_prot_region(fd, PROT_READ | PROT_WRITE);
795    if (result < 0) {
796        status = result;
797    } else {
798        void* ptr = ::mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
799        if (ptr == MAP_FAILED) {
800            status = -errno;
801        } else {
802            result = ashmem_set_prot_region(fd, PROT_READ);
803            if (result < 0) {
804                status = result;
805            } else {
806                status = writeInt32(1);
807                if (!status) {
808                    status = writeFileDescriptor(fd, true /*takeOwnership*/);
809                    if (!status) {
810                        outBlob->init(true /*mapped*/, ptr, len);
811                        return NO_ERROR;
812                    }
813                }
814            }
815        }
816        ::munmap(ptr, len);
817    }
818    ::close(fd);
819    return status;
820}
821
822status_t Parcel::write(const FlattenableHelperInterface& val)
823{
824    status_t err;
825
826    // size if needed
827    const size_t len = val.getFlattenedSize();
828    const size_t fd_count = val.getFdCount();
829
830    err = this->writeInt32(len);
831    if (err) return err;
832
833    err = this->writeInt32(fd_count);
834    if (err) return err;
835
836    // payload
837    void* const buf = this->writeInplace(PAD_SIZE(len));
838    if (buf == NULL)
839        return BAD_VALUE;
840
841    int* fds = NULL;
842    if (fd_count) {
843        fds = new int[fd_count];
844    }
845
846    err = val.flatten(buf, len, fds, fd_count);
847    for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) {
848        err = this->writeDupFileDescriptor( fds[i] );
849    }
850
851    if (fd_count) {
852        delete [] fds;
853    }
854
855    return err;
856}
857
858status_t Parcel::writeObject(const flat_binder_object& val, bool nullMetaData)
859{
860    const bool enoughData = (mDataPos+sizeof(val)) <= mDataCapacity;
861    const bool enoughObjects = mObjectsSize < mObjectsCapacity;
862    if (enoughData && enoughObjects) {
863restart_write:
864        *reinterpret_cast<flat_binder_object*>(mData+mDataPos) = val;
865
866        // Need to write meta-data?
867        if (nullMetaData || val.binder != NULL) {
868            mObjects[mObjectsSize] = mDataPos;
869            acquire_object(ProcessState::self(), val, this);
870            mObjectsSize++;
871        }
872
873        // remember if it's a file descriptor
874        if (val.type == BINDER_TYPE_FD) {
875            if (!mAllowFds) {
876                return FDS_NOT_ALLOWED;
877            }
878            mHasFds = mFdsKnown = true;
879        }
880
881        return finishWrite(sizeof(flat_binder_object));
882    }
883
884    if (!enoughData) {
885        const status_t err = growData(sizeof(val));
886        if (err != NO_ERROR) return err;
887    }
888    if (!enoughObjects) {
889        size_t newSize = ((mObjectsSize+2)*3)/2;
890        size_t* objects = (size_t*)realloc(mObjects, newSize*sizeof(size_t));
891        if (objects == NULL) return NO_MEMORY;
892        mObjects = objects;
893        mObjectsCapacity = newSize;
894    }
895
896    goto restart_write;
897}
898
899status_t Parcel::writeNoException()
900{
901    return writeInt32(0);
902}
903
904void Parcel::remove(size_t start, size_t amt)
905{
906    LOG_ALWAYS_FATAL("Parcel::remove() not yet implemented!");
907}
908
909status_t Parcel::read(void* outData, size_t len) const
910{
911    if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize
912            && len <= PAD_SIZE(len)) {
913        memcpy(outData, mData+mDataPos, len);
914        mDataPos += PAD_SIZE(len);
915        ALOGV("read Setting data pos of %p to %d\n", this, mDataPos);
916        return NO_ERROR;
917    }
918    return NOT_ENOUGH_DATA;
919}
920
921const void* Parcel::readInplace(size_t len) const
922{
923    if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize
924            && len <= PAD_SIZE(len)) {
925        const void* data = mData+mDataPos;
926        mDataPos += PAD_SIZE(len);
927        ALOGV("readInplace Setting data pos of %p to %d\n", this, mDataPos);
928        return data;
929    }
930    return NULL;
931}
932
933template<class T>
934status_t Parcel::readAligned(T *pArg) const {
935    COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE(sizeof(T)) == sizeof(T));
936
937    if ((mDataPos+sizeof(T)) <= mDataSize) {
938        const void* data = mData+mDataPos;
939        mDataPos += sizeof(T);
940        *pArg =  *reinterpret_cast<const T*>(data);
941        return NO_ERROR;
942    } else {
943        return NOT_ENOUGH_DATA;
944    }
945}
946
947template<class T>
948T Parcel::readAligned() const {
949    T result;
950    if (readAligned(&result) != NO_ERROR) {
951        result = 0;
952    }
953
954    return result;
955}
956
957template<class T>
958status_t Parcel::writeAligned(T val) {
959    COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE(sizeof(T)) == sizeof(T));
960
961    if ((mDataPos+sizeof(val)) <= mDataCapacity) {
962restart_write:
963        *reinterpret_cast<T*>(mData+mDataPos) = val;
964        return finishWrite(sizeof(val));
965    }
966
967    status_t err = growData(sizeof(val));
968    if (err == NO_ERROR) goto restart_write;
969    return err;
970}
971
972status_t Parcel::readInt32(int32_t *pArg) const
973{
974    return readAligned(pArg);
975}
976
977int32_t Parcel::readInt32() const
978{
979    return readAligned<int32_t>();
980}
981
982
983status_t Parcel::readInt64(int64_t *pArg) const
984{
985    return readAligned(pArg);
986}
987
988
989int64_t Parcel::readInt64() const
990{
991    return readAligned<int64_t>();
992}
993
994status_t Parcel::readFloat(float *pArg) const
995{
996    return readAligned(pArg);
997}
998
999
1000float Parcel::readFloat() const
1001{
1002    return readAligned<float>();
1003}
1004
1005#if defined(__mips__) && defined(__mips_hard_float)
1006
1007status_t Parcel::readDouble(double *pArg) const
1008{
1009    union {
1010      double d;
1011      unsigned long long ll;
1012    } u;
1013    status_t status;
1014    status = readAligned(&u.ll);
1015    *pArg = u.d;
1016    return status;
1017}
1018
1019double Parcel::readDouble() const
1020{
1021    union {
1022      double d;
1023      unsigned long long ll;
1024    } u;
1025    u.ll = readAligned<unsigned long long>();
1026    return u.d;
1027}
1028
1029#else
1030
1031status_t Parcel::readDouble(double *pArg) const
1032{
1033    return readAligned(pArg);
1034}
1035
1036double Parcel::readDouble() const
1037{
1038    return readAligned<double>();
1039}
1040
1041#endif
1042
1043status_t Parcel::readIntPtr(intptr_t *pArg) const
1044{
1045    return readAligned(pArg);
1046}
1047
1048
1049intptr_t Parcel::readIntPtr() const
1050{
1051    return readAligned<intptr_t>();
1052}
1053
1054
1055const char* Parcel::readCString() const
1056{
1057    const size_t avail = mDataSize-mDataPos;
1058    if (avail > 0) {
1059        const char* str = reinterpret_cast<const char*>(mData+mDataPos);
1060        // is the string's trailing NUL within the parcel's valid bounds?
1061        const char* eos = reinterpret_cast<const char*>(memchr(str, 0, avail));
1062        if (eos) {
1063            const size_t len = eos - str;
1064            mDataPos += PAD_SIZE(len+1);
1065            ALOGV("readCString Setting data pos of %p to %d\n", this, mDataPos);
1066            return str;
1067        }
1068    }
1069    return NULL;
1070}
1071
1072String8 Parcel::readString8() const
1073{
1074    int32_t size = readInt32();
1075    // watch for potential int overflow adding 1 for trailing NUL
1076    if (size > 0 && size < INT32_MAX) {
1077        const char* str = (const char*)readInplace(size+1);
1078        if (str) return String8(str, size);
1079    }
1080    return String8();
1081}
1082
1083String16 Parcel::readString16() const
1084{
1085    size_t len;
1086    const char16_t* str = readString16Inplace(&len);
1087    if (str) return String16(str, len);
1088    ALOGE("Reading a NULL string not supported here.");
1089    return String16();
1090}
1091
1092const char16_t* Parcel::readString16Inplace(size_t* outLen) const
1093{
1094    int32_t size = readInt32();
1095    // watch for potential int overflow from size+1
1096    if (size >= 0 && size < INT32_MAX) {
1097        *outLen = size;
1098        const char16_t* str = (const char16_t*)readInplace((size+1)*sizeof(char16_t));
1099        if (str != NULL) {
1100            return str;
1101        }
1102    }
1103    *outLen = 0;
1104    return NULL;
1105}
1106
1107sp<IBinder> Parcel::readStrongBinder() const
1108{
1109    sp<IBinder> val;
1110    unflatten_binder(ProcessState::self(), *this, &val);
1111    return val;
1112}
1113
1114wp<IBinder> Parcel::readWeakBinder() const
1115{
1116    wp<IBinder> val;
1117    unflatten_binder(ProcessState::self(), *this, &val);
1118    return val;
1119}
1120
1121int32_t Parcel::readExceptionCode() const
1122{
1123  int32_t exception_code = readAligned<int32_t>();
1124  if (exception_code == EX_HAS_REPLY_HEADER) {
1125    int32_t header_start = dataPosition();
1126    int32_t header_size = readAligned<int32_t>();
1127    // Skip over fat responses headers.  Not used (or propagated) in
1128    // native code
1129    setDataPosition(header_start + header_size);
1130    // And fat response headers are currently only used when there are no
1131    // exceptions, so return no error:
1132    return 0;
1133  }
1134  return exception_code;
1135}
1136
1137native_handle* Parcel::readNativeHandle() const
1138{
1139    int numFds, numInts;
1140    status_t err;
1141    err = readInt32(&numFds);
1142    if (err != NO_ERROR) return 0;
1143    err = readInt32(&numInts);
1144    if (err != NO_ERROR) return 0;
1145
1146    native_handle* h = native_handle_create(numFds, numInts);
1147    for (int i=0 ; err==NO_ERROR && i<numFds ; i++) {
1148        h->data[i] = dup(readFileDescriptor());
1149        if (h->data[i] < 0) err = BAD_VALUE;
1150    }
1151    err = read(h->data + numFds, sizeof(int)*numInts);
1152    if (err != NO_ERROR) {
1153        native_handle_close(h);
1154        native_handle_delete(h);
1155        h = 0;
1156    }
1157    return h;
1158}
1159
1160
1161int Parcel::readFileDescriptor() const
1162{
1163    const flat_binder_object* flat = readObject(true);
1164    if (flat) {
1165        switch (flat->type) {
1166            case BINDER_TYPE_FD:
1167                //ALOGI("Returning file descriptor %ld from parcel %p\n", flat->handle, this);
1168                return flat->handle;
1169        }
1170    }
1171    return BAD_TYPE;
1172}
1173
1174status_t Parcel::readBlob(size_t len, ReadableBlob* outBlob) const
1175{
1176    int32_t useAshmem;
1177    status_t status = readInt32(&useAshmem);
1178    if (status) return status;
1179
1180    if (!useAshmem) {
1181        ALOGV("readBlob: read in place");
1182        const void* ptr = readInplace(len);
1183        if (!ptr) return BAD_VALUE;
1184
1185        outBlob->init(false /*mapped*/, const_cast<void*>(ptr), len);
1186        return NO_ERROR;
1187    }
1188
1189    ALOGV("readBlob: read from ashmem");
1190    int fd = readFileDescriptor();
1191    if (fd == int(BAD_TYPE)) return BAD_VALUE;
1192
1193    void* ptr = ::mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0);
1194    if (!ptr) return NO_MEMORY;
1195
1196    outBlob->init(true /*mapped*/, ptr, len);
1197    return NO_ERROR;
1198}
1199
1200status_t Parcel::read(FlattenableHelperInterface& val) const
1201{
1202    // size
1203    const size_t len = this->readInt32();
1204    const size_t fd_count = this->readInt32();
1205
1206    // payload
1207    void const* const buf = this->readInplace(PAD_SIZE(len));
1208    if (buf == NULL)
1209        return BAD_VALUE;
1210
1211    int* fds = NULL;
1212    if (fd_count) {
1213        fds = new int[fd_count];
1214    }
1215
1216    status_t err = NO_ERROR;
1217    for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) {
1218        fds[i] = dup(this->readFileDescriptor());
1219        if (fds[i] < 0) err = BAD_VALUE;
1220    }
1221
1222    if (err == NO_ERROR) {
1223        err = val.unflatten(buf, len, fds, fd_count);
1224    }
1225
1226    if (fd_count) {
1227        delete [] fds;
1228    }
1229
1230    return err;
1231}
1232const flat_binder_object* Parcel::readObject(bool nullMetaData) const
1233{
1234    const size_t DPOS = mDataPos;
1235    if ((DPOS+sizeof(flat_binder_object)) <= mDataSize) {
1236        const flat_binder_object* obj
1237                = reinterpret_cast<const flat_binder_object*>(mData+DPOS);
1238        mDataPos = DPOS + sizeof(flat_binder_object);
1239        if (!nullMetaData && (obj->cookie == NULL && obj->binder == NULL)) {
1240            // When transferring a NULL object, we don't write it into
1241            // the object list, so we don't want to check for it when
1242            // reading.
1243            ALOGV("readObject Setting data pos of %p to %d\n", this, mDataPos);
1244            return obj;
1245        }
1246
1247        // Ensure that this object is valid...
1248        size_t* const OBJS = mObjects;
1249        const size_t N = mObjectsSize;
1250        size_t opos = mNextObjectHint;
1251
1252        if (N > 0) {
1253            ALOGV("Parcel %p looking for obj at %d, hint=%d\n",
1254                 this, DPOS, opos);
1255
1256            // Start at the current hint position, looking for an object at
1257            // the current data position.
1258            if (opos < N) {
1259                while (opos < (N-1) && OBJS[opos] < DPOS) {
1260                    opos++;
1261                }
1262            } else {
1263                opos = N-1;
1264            }
1265            if (OBJS[opos] == DPOS) {
1266                // Found it!
1267                ALOGV("Parcel found obj %d at index %d with forward search",
1268                     this, DPOS, opos);
1269                mNextObjectHint = opos+1;
1270                ALOGV("readObject Setting data pos of %p to %d\n", this, mDataPos);
1271                return obj;
1272            }
1273
1274            // Look backwards for it...
1275            while (opos > 0 && OBJS[opos] > DPOS) {
1276                opos--;
1277            }
1278            if (OBJS[opos] == DPOS) {
1279                // Found it!
1280                ALOGV("Parcel found obj %d at index %d with backward search",
1281                     this, DPOS, opos);
1282                mNextObjectHint = opos+1;
1283                ALOGV("readObject Setting data pos of %p to %d\n", this, mDataPos);
1284                return obj;
1285            }
1286        }
1287        ALOGW("Attempt to read object from Parcel %p at offset %d that is not in the object list",
1288             this, DPOS);
1289    }
1290    return NULL;
1291}
1292
1293void Parcel::closeFileDescriptors()
1294{
1295    size_t i = mObjectsSize;
1296    if (i > 0) {
1297        //ALOGI("Closing file descriptors for %d objects...", mObjectsSize);
1298    }
1299    while (i > 0) {
1300        i--;
1301        const flat_binder_object* flat
1302            = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]);
1303        if (flat->type == BINDER_TYPE_FD) {
1304            //ALOGI("Closing fd: %ld\n", flat->handle);
1305            close(flat->handle);
1306        }
1307    }
1308}
1309
1310const uint8_t* Parcel::ipcData() const
1311{
1312    return mData;
1313}
1314
1315size_t Parcel::ipcDataSize() const
1316{
1317    return (mDataSize > mDataPos ? mDataSize : mDataPos);
1318}
1319
1320const size_t* Parcel::ipcObjects() const
1321{
1322    return mObjects;
1323}
1324
1325size_t Parcel::ipcObjectsCount() const
1326{
1327    return mObjectsSize;
1328}
1329
1330void Parcel::ipcSetDataReference(const uint8_t* data, size_t dataSize,
1331    const size_t* objects, size_t objectsCount, release_func relFunc, void* relCookie)
1332{
1333    size_t minOffset = 0;
1334    freeDataNoInit();
1335    mError = NO_ERROR;
1336    mData = const_cast<uint8_t*>(data);
1337    mDataSize = mDataCapacity = dataSize;
1338    //ALOGI("setDataReference Setting data size of %p to %lu (pid=%d)\n", this, mDataSize, getpid());
1339    mDataPos = 0;
1340    ALOGV("setDataReference Setting data pos of %p to %d\n", this, mDataPos);
1341    mObjects = const_cast<size_t*>(objects);
1342    mObjectsSize = mObjectsCapacity = objectsCount;
1343    mNextObjectHint = 0;
1344    mOwner = relFunc;
1345    mOwnerCookie = relCookie;
1346    for (size_t i = 0; i < mObjectsSize; i++) {
1347        size_t offset = mObjects[i];
1348        if (offset < minOffset) {
1349            ALOGE("%s: bad object offset %zu < %zu\n",
1350                  __func__, offset, minOffset);
1351            mObjectsSize = 0;
1352            break;
1353        }
1354        minOffset = offset + sizeof(flat_binder_object);
1355    }
1356    scanForFds();
1357}
1358
1359void Parcel::print(TextOutput& to, uint32_t flags) const
1360{
1361    to << "Parcel(";
1362
1363    if (errorCheck() != NO_ERROR) {
1364        const status_t err = errorCheck();
1365        to << "Error: " << (void*)err << " \"" << strerror(-err) << "\"";
1366    } else if (dataSize() > 0) {
1367        const uint8_t* DATA = data();
1368        to << indent << HexDump(DATA, dataSize()) << dedent;
1369        const size_t* OBJS = objects();
1370        const size_t N = objectsCount();
1371        for (size_t i=0; i<N; i++) {
1372            const flat_binder_object* flat
1373                = reinterpret_cast<const flat_binder_object*>(DATA+OBJS[i]);
1374            to << endl << "Object #" << i << " @ " << (void*)OBJS[i] << ": "
1375                << TypeCode(flat->type & 0x7f7f7f00)
1376                << " = " << flat->binder;
1377        }
1378    } else {
1379        to << "NULL";
1380    }
1381
1382    to << ")";
1383}
1384
1385void Parcel::releaseObjects()
1386{
1387    const sp<ProcessState> proc(ProcessState::self());
1388    size_t i = mObjectsSize;
1389    uint8_t* const data = mData;
1390    size_t* const objects = mObjects;
1391    while (i > 0) {
1392        i--;
1393        const flat_binder_object* flat
1394            = reinterpret_cast<flat_binder_object*>(data+objects[i]);
1395        release_object(proc, *flat, this);
1396    }
1397}
1398
1399void Parcel::acquireObjects()
1400{
1401    const sp<ProcessState> proc(ProcessState::self());
1402    size_t i = mObjectsSize;
1403    uint8_t* const data = mData;
1404    size_t* const objects = mObjects;
1405    while (i > 0) {
1406        i--;
1407        const flat_binder_object* flat
1408            = reinterpret_cast<flat_binder_object*>(data+objects[i]);
1409        acquire_object(proc, *flat, this);
1410    }
1411}
1412
1413void Parcel::freeData()
1414{
1415    freeDataNoInit();
1416    initState();
1417}
1418
1419void Parcel::freeDataNoInit()
1420{
1421    if (mOwner) {
1422        //ALOGI("Freeing data ref of %p (pid=%d)\n", this, getpid());
1423        mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie);
1424    } else {
1425        releaseObjects();
1426        if (mData) free(mData);
1427        if (mObjects) free(mObjects);
1428    }
1429}
1430
1431status_t Parcel::growData(size_t len)
1432{
1433    size_t newSize = ((mDataSize+len)*3)/2;
1434    return (newSize <= mDataSize)
1435            ? (status_t) NO_MEMORY
1436            : continueWrite(newSize);
1437}
1438
1439status_t Parcel::restartWrite(size_t desired)
1440{
1441    if (mOwner) {
1442        freeData();
1443        return continueWrite(desired);
1444    }
1445
1446    uint8_t* data = (uint8_t*)realloc(mData, desired);
1447    if (!data && desired > mDataCapacity) {
1448        mError = NO_MEMORY;
1449        return NO_MEMORY;
1450    }
1451
1452    releaseObjects();
1453
1454    if (data) {
1455        mData = data;
1456        mDataCapacity = desired;
1457    }
1458
1459    mDataSize = mDataPos = 0;
1460    ALOGV("restartWrite Setting data size of %p to %d\n", this, mDataSize);
1461    ALOGV("restartWrite Setting data pos of %p to %d\n", this, mDataPos);
1462
1463    free(mObjects);
1464    mObjects = NULL;
1465    mObjectsSize = mObjectsCapacity = 0;
1466    mNextObjectHint = 0;
1467    mHasFds = false;
1468    mFdsKnown = true;
1469    mAllowFds = true;
1470
1471    return NO_ERROR;
1472}
1473
1474status_t Parcel::continueWrite(size_t desired)
1475{
1476    // If shrinking, first adjust for any objects that appear
1477    // after the new data size.
1478    size_t objectsSize = mObjectsSize;
1479    if (desired < mDataSize) {
1480        if (desired == 0) {
1481            objectsSize = 0;
1482        } else {
1483            while (objectsSize > 0) {
1484                if (mObjects[objectsSize-1] < desired)
1485                    break;
1486                objectsSize--;
1487            }
1488        }
1489    }
1490
1491    if (mOwner) {
1492        // If the size is going to zero, just release the owner's data.
1493        if (desired == 0) {
1494            freeData();
1495            return NO_ERROR;
1496        }
1497
1498        // If there is a different owner, we need to take
1499        // posession.
1500        uint8_t* data = (uint8_t*)malloc(desired);
1501        if (!data) {
1502            mError = NO_MEMORY;
1503            return NO_MEMORY;
1504        }
1505        size_t* objects = NULL;
1506
1507        if (objectsSize) {
1508            objects = (size_t*)malloc(objectsSize*sizeof(size_t));
1509            if (!objects) {
1510                free(data);
1511
1512                mError = NO_MEMORY;
1513                return NO_MEMORY;
1514            }
1515
1516            // Little hack to only acquire references on objects
1517            // we will be keeping.
1518            size_t oldObjectsSize = mObjectsSize;
1519            mObjectsSize = objectsSize;
1520            acquireObjects();
1521            mObjectsSize = oldObjectsSize;
1522        }
1523
1524        if (mData) {
1525            memcpy(data, mData, mDataSize < desired ? mDataSize : desired);
1526        }
1527        if (objects && mObjects) {
1528            memcpy(objects, mObjects, objectsSize*sizeof(size_t));
1529        }
1530        //ALOGI("Freeing data ref of %p (pid=%d)\n", this, getpid());
1531        mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie);
1532        mOwner = NULL;
1533
1534        mData = data;
1535        mObjects = objects;
1536        mDataSize = (mDataSize < desired) ? mDataSize : desired;
1537        ALOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize);
1538        mDataCapacity = desired;
1539        mObjectsSize = mObjectsCapacity = objectsSize;
1540        mNextObjectHint = 0;
1541
1542    } else if (mData) {
1543        if (objectsSize < mObjectsSize) {
1544            // Need to release refs on any objects we are dropping.
1545            const sp<ProcessState> proc(ProcessState::self());
1546            for (size_t i=objectsSize; i<mObjectsSize; i++) {
1547                const flat_binder_object* flat
1548                    = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]);
1549                if (flat->type == BINDER_TYPE_FD) {
1550                    // will need to rescan because we may have lopped off the only FDs
1551                    mFdsKnown = false;
1552                }
1553                release_object(proc, *flat, this);
1554            }
1555            size_t* objects =
1556                (size_t*)realloc(mObjects, objectsSize*sizeof(size_t));
1557            if (objects) {
1558                mObjects = objects;
1559            }
1560            mObjectsSize = objectsSize;
1561            mNextObjectHint = 0;
1562        }
1563
1564        // We own the data, so we can just do a realloc().
1565        if (desired > mDataCapacity) {
1566            uint8_t* data = (uint8_t*)realloc(mData, desired);
1567            if (data) {
1568                mData = data;
1569                mDataCapacity = desired;
1570            } else if (desired > mDataCapacity) {
1571                mError = NO_MEMORY;
1572                return NO_MEMORY;
1573            }
1574        } else {
1575            if (mDataSize > desired) {
1576                mDataSize = desired;
1577                ALOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize);
1578            }
1579            if (mDataPos > desired) {
1580                mDataPos = desired;
1581                ALOGV("continueWrite Setting data pos of %p to %d\n", this, mDataPos);
1582            }
1583        }
1584
1585    } else {
1586        // This is the first data.  Easy!
1587        uint8_t* data = (uint8_t*)malloc(desired);
1588        if (!data) {
1589            mError = NO_MEMORY;
1590            return NO_MEMORY;
1591        }
1592
1593        if(!(mDataCapacity == 0 && mObjects == NULL
1594             && mObjectsCapacity == 0)) {
1595            ALOGE("continueWrite: %d/%p/%d/%d", mDataCapacity, mObjects, mObjectsCapacity, desired);
1596        }
1597
1598        mData = data;
1599        mDataSize = mDataPos = 0;
1600        ALOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize);
1601        ALOGV("continueWrite Setting data pos of %p to %d\n", this, mDataPos);
1602        mDataCapacity = desired;
1603    }
1604
1605    return NO_ERROR;
1606}
1607
1608void Parcel::initState()
1609{
1610    mError = NO_ERROR;
1611    mData = 0;
1612    mDataSize = 0;
1613    mDataCapacity = 0;
1614    mDataPos = 0;
1615    ALOGV("initState Setting data size of %p to %d\n", this, mDataSize);
1616    ALOGV("initState Setting data pos of %p to %d\n", this, mDataPos);
1617    mObjects = NULL;
1618    mObjectsSize = 0;
1619    mObjectsCapacity = 0;
1620    mNextObjectHint = 0;
1621    mHasFds = false;
1622    mFdsKnown = true;
1623    mAllowFds = true;
1624    mOwner = NULL;
1625}
1626
1627void Parcel::scanForFds() const
1628{
1629    bool hasFds = false;
1630    for (size_t i=0; i<mObjectsSize; i++) {
1631        const flat_binder_object* flat
1632            = reinterpret_cast<const flat_binder_object*>(mData + mObjects[i]);
1633        if (flat->type == BINDER_TYPE_FD) {
1634            hasFds = true;
1635            break;
1636        }
1637    }
1638    mHasFds = hasFds;
1639    mFdsKnown = true;
1640}
1641
1642// --- Parcel::Blob ---
1643
1644Parcel::Blob::Blob() :
1645        mMapped(false), mData(NULL), mSize(0) {
1646}
1647
1648Parcel::Blob::~Blob() {
1649    release();
1650}
1651
1652void Parcel::Blob::release() {
1653    if (mMapped && mData) {
1654        ::munmap(mData, mSize);
1655    }
1656    clear();
1657}
1658
1659void Parcel::Blob::init(bool mapped, void* data, size_t size) {
1660    mMapped = mapped;
1661    mData = data;
1662    mSize = size;
1663}
1664
1665void Parcel::Blob::clear() {
1666    mMapped = false;
1667    mData = NULL;
1668    mSize = 0;
1669}
1670
1671}; // namespace android
1672