FwdLockEngine.cpp revision bf5b3b29e31b293313788d7464cfb258ac0da803 
1/*
2 * Copyright (C) 2010 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#include "SessionMap.h"
18#include "FwdLockEngine.h"
19#include <utils/Log.h>
20#include <errno.h>
21#include <stdio.h>
22#include <unistd.h>
23#include "drm_framework_common.h"
24#include <fcntl.h>
25#include <limits.h>
26#include <DrmRights.h>
27#include <DrmConstraints.h>
28#include <DrmMetadata.h>
29#include <DrmInfo.h>
30#include <DrmInfoStatus.h>
31#include <DrmInfoRequest.h>
32#include <DrmSupportInfo.h>
33#include <DrmConvertedStatus.h>
34#include <utils/String8.h>
35#include "FwdLockConv.h"
36#include "FwdLockFile.h"
37#include "FwdLockGlue.h"
38#include "MimeTypeUtil.h"
39
40#undef LOG_TAG
41#define LOG_TAG "FwdLockEngine"
42
43#ifdef DRM_OMA_FL_ENGINE_DEBUG
44#define LOG_NDEBUG 0
45#define LOG_VERBOSE(...) ALOGV(__VA_ARGS__)
46#else
47#define LOG_VERBOSE(...)
48#endif
49
50using namespace android;
51// This extern "C" is mandatory to be managed by TPlugInManager
52extern "C" IDrmEngine* create() {
53    return new FwdLockEngine();
54}
55
56// This extern "C" is mandatory to be managed by TPlugInManager
57extern "C" void destroy(IDrmEngine* plugIn) {
58    delete plugIn;
59}
60
61FwdLockEngine::FwdLockEngine() {
62    LOG_VERBOSE("FwdLockEngine Construction");
63}
64
65FwdLockEngine::~FwdLockEngine() {
66    LOG_VERBOSE("FwdLockEngine Destruction");
67
68    int size = decodeSessionMap.getSize();
69
70    for (int i = 0; i < size; i++) {
71        DecodeSession *session = (DecodeSession*) decodeSessionMap.getValueAt(i);
72        FwdLockFile_detach(session->fileDesc);
73        ::close(session->fileDesc);
74    }
75
76    size = convertSessionMap.getSize();
77    for (int i = 0; i < size; i++) {
78        ConvertSession *convSession = (ConvertSession*) convertSessionMap.getValueAt(i);
79        FwdLockConv_CloseSession(convSession->uniqueId, &(convSession->output));
80    }
81}
82
83int FwdLockEngine::getConvertedStatus(FwdLockConv_Status_t status) {
84    int retStatus = DrmConvertedStatus::STATUS_ERROR;
85
86    switch(status) {
87        case FwdLockConv_Status_OK:
88            retStatus = DrmConvertedStatus::STATUS_OK;
89            break;
90        case FwdLockConv_Status_SyntaxError:
91        case FwdLockConv_Status_InvalidArgument:
92        case FwdLockConv_Status_UnsupportedFileFormat:
93        case FwdLockConv_Status_UnsupportedContentTransferEncoding:
94            ALOGE("FwdLockEngine getConvertedStatus: file conversion Error %d. "
95                  "Returning STATUS_INPUTDATA_ERROR", status);
96            retStatus = DrmConvertedStatus::STATUS_INPUTDATA_ERROR;
97            break;
98        default:
99            ALOGE("FwdLockEngine getConvertedStatus: file conversion Error %d. "
100                  "Returning STATUS_ERROR", status);
101            retStatus = DrmConvertedStatus::STATUS_ERROR;
102            break;
103    }
104
105    return retStatus;
106}
107
108DrmConstraints* FwdLockEngine::onGetConstraints(int uniqueId, const String8* path, int action) {
109    DrmConstraints* drmConstraints = NULL;
110
111    LOG_VERBOSE("FwdLockEngine::onGetConstraints");
112
113    if (NULL != path &&
114        (RightsStatus::RIGHTS_VALID == onCheckRightsStatus(uniqueId, *path, action))) {
115        // Return the empty constraints to show no error condition.
116        drmConstraints = new DrmConstraints();
117    }
118
119    return drmConstraints;
120}
121
122DrmMetadata* FwdLockEngine::onGetMetadata(int uniqueId, const String8* path) {
123    DrmMetadata* drmMetadata = NULL;
124
125    LOG_VERBOSE("FwdLockEngine::onGetMetadata");
126
127    if (NULL != path) {
128        // Returns empty metadata to show no error condition.
129        drmMetadata = new DrmMetadata();
130    }
131
132    return drmMetadata;
133}
134
135android::status_t FwdLockEngine::onInitialize(int uniqueId) {
136    LOG_VERBOSE("FwdLockEngine::onInitialize");
137
138    if (FwdLockGlue_InitializeKeyEncryption()) {
139        LOG_VERBOSE("FwdLockEngine::onInitialize -- FwdLockGlue_InitializeKeyEncryption succeeded");
140    } else {
141        ALOGE("FwdLockEngine::onInitialize -- FwdLockGlue_InitializeKeyEncryption failed:"
142             "errno = %d", errno);
143    }
144
145    return DRM_NO_ERROR;
146}
147
148android::status_t
149FwdLockEngine::onSetOnInfoListener(int uniqueId, const IDrmEngine::OnInfoListener* infoListener) {
150    // Not used
151    LOG_VERBOSE("FwdLockEngine::onSetOnInfoListener");
152
153    return DRM_NO_ERROR;
154}
155
156android::status_t FwdLockEngine::onTerminate(int uniqueId) {
157    LOG_VERBOSE("FwdLockEngine::onTerminate");
158
159    return DRM_NO_ERROR;
160}
161
162// make sure that lower-case letters are used.
163const String8 FwdLockEngine::FileSuffixes[] = {
164    String8(".fl"),
165    String8(".dm"),
166};
167
168// make sure that lower-case letters are used.
169const String8 FwdLockEngine::MimeTypes[] = {
170    String8("application/x-android-drm-fl"),
171    String8("application/vnd.oma.drm.message"),
172};
173
174const String8 FwdLockEngine::Description("OMA V1 Forward Lock");
175
176void FwdLockEngine::AddSupportedMimeTypes(DrmSupportInfo *info) {
177    for (size_t i = 0, n = sizeof(MimeTypes)/sizeof(MimeTypes[0]); i < n; ++i) {
178        info->addMimeType(MimeTypes[i]);
179    }
180}
181
182void FwdLockEngine::AddSupportedFileSuffixes(DrmSupportInfo *info) {
183    for (size_t i = 0, n = sizeof(FileSuffixes)/sizeof(FileSuffixes[0]); i < n; ++i) {
184        info->addFileSuffix(FileSuffixes[i]);
185    }
186}
187
188bool FwdLockEngine::IsMimeTypeSupported(const String8& mime) {
189    String8 tmp(mime);
190    tmp.toLower();
191    for (size_t i = 0, n = sizeof(MimeTypes)/sizeof(MimeTypes[0]); i < n; ++i) {
192        if (tmp == MimeTypes[i]) {
193            return true;
194        }
195    }
196    return false;
197}
198
199bool FwdLockEngine::IsFileSuffixSupported(const String8& suffix) {
200    String8 tmp(suffix);
201    tmp.toLower();
202    for (size_t i = 0, n = sizeof(FileSuffixes)/sizeof(FileSuffixes[0]); i < n; ++i) {
203        if (tmp == FileSuffixes[i]) {
204            return true;
205        }
206    }
207    return false;
208}
209
210DrmSupportInfo* FwdLockEngine::onGetSupportInfo(int uniqueId) {
211    DrmSupportInfo* pSupportInfo = new DrmSupportInfo();
212
213    LOG_VERBOSE("FwdLockEngine::onGetSupportInfo");
214
215    // fill all Forward Lock mimetypes and extensions
216    if (NULL != pSupportInfo) {
217        AddSupportedMimeTypes(pSupportInfo);
218        AddSupportedFileSuffixes(pSupportInfo);
219        pSupportInfo->setDescription(Description);
220    }
221
222    return pSupportInfo;
223}
224
225bool FwdLockEngine::onCanHandle(int uniqueId, const String8& path) {
226    bool result = false;
227
228    String8 extString = path.getPathExtension();
229    return IsFileSuffixSupported(extString);
230}
231
232DrmInfoStatus* FwdLockEngine::onProcessDrmInfo(int uniqueId, const DrmInfo* drmInfo) {
233    DrmInfoStatus *drmInfoStatus = NULL;
234
235    // Nothing to process
236
237    drmInfoStatus = new DrmInfoStatus((int)DrmInfoStatus::STATUS_OK, 0, NULL, String8(""));
238
239    LOG_VERBOSE("FwdLockEngine::onProcessDrmInfo");
240
241    return drmInfoStatus;
242}
243
244status_t FwdLockEngine::onSaveRights(
245            int uniqueId,
246            const DrmRights& drmRights,
247            const String8& rightsPath,
248            const String8& contentPath) {
249    // No rights to save. Return
250    LOG_VERBOSE("FwdLockEngine::onSaveRights");
251    return DRM_ERROR_UNKNOWN;
252}
253
254DrmInfo* FwdLockEngine::onAcquireDrmInfo(int uniqueId, const DrmInfoRequest* drmInfoRequest) {
255    DrmInfo* drmInfo = NULL;
256
257    // Nothing to be done for Forward Lock file
258    LOG_VERBOSE("FwdLockEngine::onAcquireDrmInfo");
259
260    return drmInfo;
261}
262
263int FwdLockEngine::onCheckRightsStatus(int uniqueId,
264                                       const String8& path,
265                                       int action) {
266    int result = RightsStatus::RIGHTS_INVALID;
267
268    LOG_VERBOSE("FwdLockEngine::onCheckRightsStatus");
269
270    // Only Transfer action is not allowed for forward Lock files.
271    if (onCanHandle(uniqueId, path)) {
272        switch(action) {
273            case Action::DEFAULT:
274            case Action::PLAY:
275            case Action::RINGTONE:
276            case Action::OUTPUT:
277            case Action::PREVIEW:
278            case Action::EXECUTE:
279            case Action::DISPLAY:
280                result = RightsStatus::RIGHTS_VALID;
281                break;
282
283            case Action::TRANSFER:
284            default:
285                result = RightsStatus::RIGHTS_INVALID;
286                break;
287        }
288    }
289
290    return result;
291}
292
293status_t FwdLockEngine::onConsumeRights(int uniqueId,
294                                        DecryptHandle* decryptHandle,
295                                        int action,
296                                        bool reserve) {
297    // No rights consumption
298    LOG_VERBOSE("FwdLockEngine::onConsumeRights");
299    return DRM_NO_ERROR;
300}
301
302bool FwdLockEngine::onValidateAction(int uniqueId,
303                                     const String8& path,
304                                     int action,
305                                     const ActionDescription& description) {
306    LOG_VERBOSE("FwdLockEngine::onValidateAction");
307
308    // For the forwardlock engine checkRights and ValidateAction are the same.
309    return (onCheckRightsStatus(uniqueId, path, action) == RightsStatus::RIGHTS_VALID);
310}
311
312String8 FwdLockEngine::onGetOriginalMimeType(int uniqueId, const String8& path, int fd) {
313    LOG_VERBOSE("FwdLockEngine::onGetOriginalMimeType");
314    String8 mimeString = String8("");
315    int fileDesc = dup(fd);
316
317    if (-1 < fileDesc) {
318        if (FwdLockFile_attach(fileDesc) < 0) {
319            return mimeString;
320        }
321        const char* pMimeType = FwdLockFile_GetContentType(fileDesc);
322
323        if (NULL != pMimeType) {
324            String8 contentType = String8(pMimeType);
325            contentType.toLower();
326            mimeString = MimeTypeUtil::convertMimeType(contentType);
327        }
328
329        FwdLockFile_close(fileDesc);
330    }
331
332    return mimeString;
333}
334
335int FwdLockEngine::onGetDrmObjectType(int uniqueId,
336                                      const String8& path,
337                                      const String8& mimeType) {
338    String8 mimeStr = String8(mimeType);
339
340    LOG_VERBOSE("FwdLockEngine::onGetDrmObjectType");
341
342    /* Checks whether
343    * 1. path and mime type both are not empty strings (meaning unavailable) else content is unknown
344    * 2. if one of them is empty string and if other is known then its a DRM Content Object.
345    * 3. if both of them are available, then both may be of known type
346    *    (regardless of the relation between them to make it compatible with other DRM Engines)
347    */
348    if (((0 == path.length()) || onCanHandle(uniqueId, path)) &&
349        ((0 == mimeType.length()) || IsMimeTypeSupported(mimeType)) && (mimeType != path) ) {
350            return DrmObjectType::CONTENT;
351    }
352
353    return DrmObjectType::UNKNOWN;
354}
355
356status_t FwdLockEngine::onRemoveRights(int uniqueId, const String8& path) {
357    // No Rights to remove
358    LOG_VERBOSE("FwdLockEngine::onRemoveRights");
359    return DRM_NO_ERROR;
360}
361
362status_t FwdLockEngine::onRemoveAllRights(int uniqueId) {
363    // No rights to remove
364    LOG_VERBOSE("FwdLockEngine::onRemoveAllRights");
365    return DRM_NO_ERROR;
366}
367
368#ifdef USE_64BIT_DRM_API
369status_t FwdLockEngine::onSetPlaybackStatus(int uniqueId, DecryptHandle* decryptHandle,
370                                            int playbackStatus, int64_t position) {
371#else
372status_t FwdLockEngine::onSetPlaybackStatus(int uniqueId, DecryptHandle* decryptHandle,
373                                            int playbackStatus, int position) {
374#endif
375    // Not used
376    LOG_VERBOSE("FwdLockEngine::onSetPlaybackStatus");
377    return DRM_NO_ERROR;
378}
379
380status_t FwdLockEngine::onOpenConvertSession(int uniqueId,
381                                         int convertId) {
382    status_t result = DRM_ERROR_UNKNOWN;
383    LOG_VERBOSE("FwdLockEngine::onOpenConvertSession");
384    if (!convertSessionMap.isCreated(convertId)) {
385        ConvertSession *newSession = new ConvertSession();
386        if (FwdLockConv_Status_OK ==
387            FwdLockConv_OpenSession(&(newSession->uniqueId), &(newSession->output))) {
388            convertSessionMap.addValue(convertId, newSession);
389            result = DRM_NO_ERROR;
390        } else {
391            ALOGE("FwdLockEngine::onOpenConvertSession -- FwdLockConv_OpenSession failed.");
392            delete newSession;
393        }
394    }
395    return result;
396}
397
398DrmConvertedStatus* FwdLockEngine::onConvertData(int uniqueId,
399                                                 int convertId,
400                                                 const DrmBuffer* inputData) {
401    FwdLockConv_Status_t retStatus = FwdLockConv_Status_InvalidArgument;
402    DrmBuffer *convResult = new DrmBuffer(NULL, 0);
403    int offset = -1;
404
405    if (NULL != inputData && convertSessionMap.isCreated(convertId)) {
406        ConvertSession *convSession = convertSessionMap.getValue(convertId);
407
408        if (NULL != convSession) {
409            retStatus = FwdLockConv_ConvertData(convSession->uniqueId,
410                                                inputData->data,
411                                                inputData->length,
412                                                &(convSession->output));
413
414            if (FwdLockConv_Status_OK == retStatus) {
415                // return bytes from conversion if available
416                if (convSession->output.fromConvertData.numBytes > 0) {
417                    convResult->data = new char[convSession->output.fromConvertData.numBytes];
418
419                    if (NULL != convResult->data) {
420                        convResult->length = convSession->output.fromConvertData.numBytes;
421                        memcpy(convResult->data,
422                               (char *)convSession->output.fromConvertData.pBuffer,
423                               convResult->length);
424                    }
425                }
426            } else {
427                offset = convSession->output.fromConvertData.errorPos;
428            }
429        }
430    }
431    return new DrmConvertedStatus(getConvertedStatus(retStatus), convResult, offset);
432}
433
434DrmConvertedStatus* FwdLockEngine::onCloseConvertSession(int uniqueId,
435                                                         int convertId) {
436    FwdLockConv_Status_t retStatus = FwdLockConv_Status_InvalidArgument;
437    DrmBuffer *convResult = new DrmBuffer(NULL, 0);
438    int offset = -1;
439
440    LOG_VERBOSE("FwdLockEngine::onCloseConvertSession");
441
442    if (convertSessionMap.isCreated(convertId)) {
443        ConvertSession *convSession = convertSessionMap.getValue(convertId);
444
445        if (NULL != convSession) {
446            retStatus = FwdLockConv_CloseSession(convSession->uniqueId, &(convSession->output));
447
448            if (FwdLockConv_Status_OK == retStatus) {
449                offset = convSession->output.fromCloseSession.fileOffset;
450                convResult->data = new char[FWD_LOCK_SIGNATURES_SIZE];
451
452                if (NULL != convResult->data) {
453                      convResult->length = FWD_LOCK_SIGNATURES_SIZE;
454                      memcpy(convResult->data,
455                             (char *)convSession->output.fromCloseSession.signatures,
456                             convResult->length);
457                }
458            }
459        }
460        convertSessionMap.removeValue(convertId);
461    }
462    return new DrmConvertedStatus(getConvertedStatus(retStatus), convResult, offset);
463}
464
465#ifdef USE_64BIT_DRM_API
466status_t FwdLockEngine::onOpenDecryptSession(int uniqueId,
467                                             DecryptHandle* decryptHandle,
468                                             int fd,
469                                             off64_t offset,
470                                             off64_t length) {
471#else
472status_t FwdLockEngine::onOpenDecryptSession(int uniqueId,
473                                             DecryptHandle* decryptHandle,
474                                             int fd,
475                                             int offset,
476                                             int length) {
477#endif
478    status_t result = DRM_ERROR_CANNOT_HANDLE;
479    int fileDesc = -1;
480
481    LOG_VERBOSE("FwdLockEngine::onOpenDecryptSession");
482
483    if ((-1 < fd) &&
484        (NULL != decryptHandle) &&
485        (!decodeSessionMap.isCreated(decryptHandle->decryptId))) {
486        fileDesc = dup(fd);
487    } else {
488        ALOGE("FwdLockEngine::onOpenDecryptSession parameter error");
489        return result;
490    }
491
492    if (-1 < fileDesc &&
493        -1 < ::lseek(fileDesc, offset, SEEK_SET) &&
494        -1 < FwdLockFile_attach(fileDesc)) {
495        // check for file integrity. This must be done to protect the content mangling.
496        int retVal = FwdLockFile_CheckHeaderIntegrity(fileDesc);
497        DecodeSession* decodeSession = new DecodeSession(fileDesc);
498
499        if (retVal && NULL != decodeSession) {
500            decodeSessionMap.addValue(decryptHandle->decryptId, decodeSession);
501            const char *pmime= FwdLockFile_GetContentType(fileDesc);
502            String8 contentType = String8(pmime == NULL ? "" : pmime);
503            contentType.toLower();
504            decryptHandle->mimeType = MimeTypeUtil::convertMimeType(contentType);
505            decryptHandle->decryptApiType = DecryptApiType::CONTAINER_BASED;
506            decryptHandle->status = RightsStatus::RIGHTS_VALID;
507            decryptHandle->decryptInfo = NULL;
508            result = DRM_NO_ERROR;
509        } else {
510            LOG_VERBOSE("FwdLockEngine::onOpenDecryptSession Integrity Check failed for the fd");
511            FwdLockFile_detach(fileDesc);
512            delete decodeSession;
513        }
514    }
515
516    if (DRM_NO_ERROR != result && -1 < fileDesc) {
517        ::close(fileDesc);
518    }
519
520    LOG_VERBOSE("FwdLockEngine::onOpenDecryptSession Exit. result = %d", result);
521
522    return result;
523}
524
525status_t FwdLockEngine::onOpenDecryptSession(int uniqueId,
526                                             DecryptHandle* decryptHandle,
527                                             const char* uri) {
528    status_t result = DRM_ERROR_CANNOT_HANDLE;
529    const char fileTag [] = "file://";
530
531    if (NULL != decryptHandle && NULL != uri && strlen(uri) > sizeof(fileTag)) {
532        String8 uriTag = String8(uri);
533        uriTag.toLower();
534
535        if (0 == strncmp(uriTag.string(), fileTag, sizeof(fileTag) - 1)) {
536            const char *filePath = strchr(uri + sizeof(fileTag) - 1, '/');
537            if (NULL != filePath && onCanHandle(uniqueId, String8(filePath))) {
538                int fd = open(filePath, O_RDONLY);
539
540                if (-1 < fd) {
541                    // offset is always 0 and length is not used. so any positive size.
542                    result = onOpenDecryptSession(uniqueId, decryptHandle, fd, 0, 1);
543
544                    // fd is duplicated already if success. closing the file
545                    close(fd);
546                }
547            }
548        }
549    }
550
551    return result;
552}
553
554status_t FwdLockEngine::onCloseDecryptSession(int uniqueId,
555                                              DecryptHandle* decryptHandle) {
556    status_t result = DRM_ERROR_UNKNOWN;
557    LOG_VERBOSE("FwdLockEngine::onCloseDecryptSession");
558
559    if (NULL != decryptHandle && decodeSessionMap.isCreated(decryptHandle->decryptId)) {
560        DecodeSession* session = decodeSessionMap.getValue(decryptHandle->decryptId);
561        if (NULL != session && session->fileDesc > -1) {
562            FwdLockFile_detach(session->fileDesc);
563            ::close(session->fileDesc);
564            decodeSessionMap.removeValue(decryptHandle->decryptId);
565            result = DRM_NO_ERROR;
566        }
567    }
568
569    if (NULL != decryptHandle) {
570        if (NULL != decryptHandle->decryptInfo) {
571            delete decryptHandle->decryptInfo;
572            decryptHandle->decryptInfo = NULL;
573        }
574
575        decryptHandle->copyControlVector.clear();
576        decryptHandle->extendedData.clear();
577
578        delete decryptHandle;
579        decryptHandle = NULL;
580    }
581
582    LOG_VERBOSE("FwdLockEngine::onCloseDecryptSession Exit");
583    return result;
584}
585
586status_t FwdLockEngine::onInitializeDecryptUnit(int uniqueId,
587                                                DecryptHandle* decryptHandle,
588                                                int decryptUnitId,
589                                                const DrmBuffer* headerInfo) {
590    ALOGE("FwdLockEngine::onInitializeDecryptUnit is not supported for this DRM scheme");
591    return DRM_ERROR_UNKNOWN;
592}
593
594status_t FwdLockEngine::onDecrypt(int uniqueId, DecryptHandle* decryptHandle, int decryptUnitId,
595            const DrmBuffer* encBuffer, DrmBuffer** decBuffer, DrmBuffer* IV) {
596    ALOGE("FwdLockEngine::onDecrypt is not supported for this DRM scheme");
597    return DRM_ERROR_UNKNOWN;
598}
599
600status_t FwdLockEngine::onDecrypt(int uniqueId,
601                                  DecryptHandle* decryptHandle,
602                                  int decryptUnitId,
603                                  const DrmBuffer* encBuffer,
604                                  DrmBuffer** decBuffer) {
605    ALOGE("FwdLockEngine::onDecrypt is not supported for this DRM scheme");
606    return DRM_ERROR_UNKNOWN;
607}
608
609status_t FwdLockEngine::onFinalizeDecryptUnit(int uniqueId,
610                                              DecryptHandle* decryptHandle,
611                                              int decryptUnitId) {
612    ALOGE("FwdLockEngine::onFinalizeDecryptUnit is not supported for this DRM scheme");
613    return DRM_ERROR_UNKNOWN;
614}
615
616ssize_t FwdLockEngine::onRead(int uniqueId,
617                              DecryptHandle* decryptHandle,
618                              void* buffer,
619                              int numBytes) {
620    ssize_t size = -1;
621
622    if (NULL != decryptHandle &&
623       decodeSessionMap.isCreated(decryptHandle->decryptId) &&
624        NULL != buffer &&
625        numBytes > -1) {
626        DecodeSession* session = decodeSessionMap.getValue(decryptHandle->decryptId);
627        if (NULL != session && session->fileDesc > -1) {
628            size = FwdLockFile_read(session->fileDesc, buffer, numBytes);
629
630            if (0 > size) {
631                session->offset = ((off_t)-1);
632            } else {
633                session->offset += size;
634            }
635        }
636    }
637
638    return size;
639}
640
641#ifdef USE_64BIT_DRM_API
642off64_t FwdLockEngine::onLseek(int uniqueId, DecryptHandle* decryptHandle,
643                               off64_t offset, int whence) {
644#else
645off_t FwdLockEngine::onLseek(int uniqueId, DecryptHandle* decryptHandle,
646                             off_t offset, int whence) {
647#endif
648    off_t offval = -1;
649
650    if (NULL != decryptHandle && decodeSessionMap.isCreated(decryptHandle->decryptId)) {
651        DecodeSession* session = decodeSessionMap.getValue(decryptHandle->decryptId);
652        if (NULL != session && session->fileDesc > -1) {
653            offval = FwdLockFile_lseek(session->fileDesc, offset, whence);
654            session->offset = offval;
655        }
656    }
657
658    return offval;
659}
660
661#ifdef USE_64BIT_DRM_API
662ssize_t FwdLockEngine::onPread(int uniqueId,
663                               DecryptHandle* decryptHandle,
664                               void* buffer,
665                               ssize_t numBytes,
666                               off64_t offset) {
667#else
668ssize_t FwdLockEngine::onPread(int uniqueId,
669                               DecryptHandle* decryptHandle,
670                               void* buffer,
671                               ssize_t numBytes,
672                               off_t offset) {
673#endif
674    ssize_t bytesRead = -1;
675
676    DecodeSession* decoderSession = NULL;
677
678    if ((NULL != decryptHandle) &&
679        (NULL != (decoderSession = decodeSessionMap.getValue(decryptHandle->decryptId))) &&
680        (NULL != buffer) &&
681        (numBytes > -1) &&
682        (offset > -1)) {
683        if (offset != decoderSession->offset) {
684            decoderSession->offset = onLseek(uniqueId, decryptHandle, offset, SEEK_SET);
685        }
686
687        if (((off_t)-1) != decoderSession->offset) {
688            bytesRead = onRead(uniqueId, decryptHandle, buffer, numBytes);
689            if (bytesRead < 0) {
690                ALOGE("FwdLockEngine::onPread error reading");
691            }
692        }
693    } else {
694        ALOGE("FwdLockEngine::onPread decryptId not found");
695    }
696
697    return bytesRead;
698}
699