1 /*
2  * Copyright (C) 2009 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_NDEBUG 0
18 #define LOG_TAG "FileSource"
19 #include <utils/Log.h>
20 
21 #include <media/stagefright/foundation/ADebug.h>
22 #include <media/stagefright/FileSource.h>
23 #include <media/stagefright/Utils.h>
24 #include <sys/types.h>
25 #include <unistd.h>
26 #include <sys/types.h>
27 #include <sys/stat.h>
28 #include <fcntl.h>
29 
30 namespace android {
31 
FileSource(const char * filename)32 FileSource::FileSource(const char *filename)
33     : mFd(-1),
34       mOffset(0),
35       mLength(-1),
36       mName("<null>"),
37       mDecryptHandle(NULL),
38       mDrmManagerClient(NULL),
39       mDrmBufOffset(0),
40       mDrmBufSize(0),
41       mDrmBuf(NULL){
42 
43     if (filename) {
44         mName = String8::format("FileSource(%s)", filename);
45     }
46     ALOGV("%s", filename);
47     mFd = open(filename, O_LARGEFILE | O_RDONLY);
48 
49     if (mFd >= 0) {
50         mLength = lseek64(mFd, 0, SEEK_END);
51     } else {
52         ALOGE("Failed to open file '%s'. (%s)", filename, strerror(errno));
53     }
54 }
55 
FileSource(int fd,int64_t offset,int64_t length)56 FileSource::FileSource(int fd, int64_t offset, int64_t length)
57     : mFd(fd),
58       mOffset(offset),
59       mLength(length),
60       mName("<null>"),
61       mDecryptHandle(NULL),
62       mDrmManagerClient(NULL),
63       mDrmBufOffset(0),
64       mDrmBufSize(0),
65       mDrmBuf(NULL) {
66     ALOGV("fd=%d (%s), offset=%lld, length=%lld",
67             fd, nameForFd(fd).c_str(), (long long) offset, (long long) length);
68 
69     if (mOffset < 0) {
70         mOffset = 0;
71     }
72     if (mLength < 0) {
73         mLength = 0;
74     }
75     if (mLength > INT64_MAX - mOffset) {
76         mLength = INT64_MAX - mOffset;
77     }
78     struct stat s;
79     if (fstat(fd, &s) == 0) {
80         if (mOffset > s.st_size) {
81             mOffset = s.st_size;
82             mLength = 0;
83         }
84         if (mOffset + mLength > s.st_size) {
85             mLength = s.st_size - mOffset;
86         }
87     }
88     if (mOffset != offset || mLength != length) {
89         ALOGW("offset/length adjusted from %lld/%lld to %lld/%lld",
90                 (long long) offset, (long long) length,
91                 (long long) mOffset, (long long) mLength);
92     }
93 
94     mName = String8::format(
95             "FileSource(fd(%s), %lld, %lld)",
96             nameForFd(fd).c_str(),
97             (long long) mOffset,
98             (long long) mLength);
99 
100 }
101 
~FileSource()102 FileSource::~FileSource() {
103     if (mFd >= 0) {
104         ::close(mFd);
105         mFd = -1;
106     }
107 
108     if (mDrmBuf != NULL) {
109         delete[] mDrmBuf;
110         mDrmBuf = NULL;
111     }
112 
113     if (mDecryptHandle != NULL) {
114         // To release mDecryptHandle
115         CHECK(mDrmManagerClient);
116         mDrmManagerClient->closeDecryptSession(mDecryptHandle);
117         mDecryptHandle = NULL;
118     }
119 
120     if (mDrmManagerClient != NULL) {
121         delete mDrmManagerClient;
122         mDrmManagerClient = NULL;
123     }
124 }
125 
initCheck() const126 status_t FileSource::initCheck() const {
127     return mFd >= 0 ? OK : NO_INIT;
128 }
129 
readAt(off64_t offset,void * data,size_t size)130 ssize_t FileSource::readAt(off64_t offset, void *data, size_t size) {
131     if (mFd < 0) {
132         return NO_INIT;
133     }
134 
135     Mutex::Autolock autoLock(mLock);
136 
137     if (mLength >= 0) {
138         if (offset >= mLength) {
139             return 0;  // read beyond EOF.
140         }
141         uint64_t numAvailable = mLength - offset;
142         if ((uint64_t)size > numAvailable) {
143             size = numAvailable;
144         }
145     }
146 
147     if (mDecryptHandle != NULL && DecryptApiType::CONTAINER_BASED
148             == mDecryptHandle->decryptApiType) {
149         return readAtDRM(offset, data, size);
150    } else {
151         off64_t result = lseek64(mFd, offset + mOffset, SEEK_SET);
152         if (result == -1) {
153             ALOGE("seek to %lld failed", (long long)(offset + mOffset));
154             return UNKNOWN_ERROR;
155         }
156 
157         return ::read(mFd, data, size);
158     }
159 }
160 
getSize(off64_t * size)161 status_t FileSource::getSize(off64_t *size) {
162     Mutex::Autolock autoLock(mLock);
163 
164     if (mFd < 0) {
165         return NO_INIT;
166     }
167 
168     *size = mLength;
169 
170     return OK;
171 }
172 
DrmInitialization(const char * mime)173 sp<DecryptHandle> FileSource::DrmInitialization(const char *mime) {
174     if (mDrmManagerClient == NULL) {
175         mDrmManagerClient = new DrmManagerClient();
176     }
177 
178     if (mDrmManagerClient == NULL) {
179         return NULL;
180     }
181 
182     if (mDecryptHandle == NULL) {
183         mDecryptHandle = mDrmManagerClient->openDecryptSession(
184                 mFd, mOffset, mLength, mime);
185     }
186 
187     if (mDecryptHandle == NULL) {
188         delete mDrmManagerClient;
189         mDrmManagerClient = NULL;
190     }
191 
192     return mDecryptHandle;
193 }
194 
getDrmInfo(sp<DecryptHandle> & handle,DrmManagerClient ** client)195 void FileSource::getDrmInfo(sp<DecryptHandle> &handle, DrmManagerClient **client) {
196     handle = mDecryptHandle;
197 
198     *client = mDrmManagerClient;
199 }
200 
readAtDRM(off64_t offset,void * data,size_t size)201 ssize_t FileSource::readAtDRM(off64_t offset, void *data, size_t size) {
202     size_t DRM_CACHE_SIZE = 1024;
203     if (mDrmBuf == NULL) {
204         mDrmBuf = new unsigned char[DRM_CACHE_SIZE];
205     }
206 
207     if (mDrmBuf != NULL && mDrmBufSize > 0 && (offset + mOffset) >= mDrmBufOffset
208             && (offset + mOffset + size) <= static_cast<size_t>(mDrmBufOffset + mDrmBufSize)) {
209         /* Use buffered data */
210         memcpy(data, (void*)(mDrmBuf+(offset+mOffset-mDrmBufOffset)), size);
211         return size;
212     } else if (size <= DRM_CACHE_SIZE) {
213         /* Buffer new data */
214         mDrmBufOffset =  offset + mOffset;
215         mDrmBufSize = mDrmManagerClient->pread(mDecryptHandle, mDrmBuf,
216                 DRM_CACHE_SIZE, offset + mOffset);
217         if (mDrmBufSize > 0) {
218             int64_t dataRead = 0;
219             dataRead = size > static_cast<size_t>(mDrmBufSize) ? mDrmBufSize : size;
220             memcpy(data, (void*)mDrmBuf, dataRead);
221             return dataRead;
222         } else {
223             return mDrmBufSize;
224         }
225     } else {
226         /* Too big chunk to cache. Call DRM directly */
227         return mDrmManagerClient->pread(mDecryptHandle, data, size, offset + mOffset);
228     }
229 }
230 }  // namespace android
231