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      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 <private/android_filesystem_config.h>
     25 #include <sys/types.h>
     26 #include <unistd.h>
     27 #include <sys/types.h>
     28 #include <sys/stat.h>
     29 #include <fcntl.h>
     30 
     31 namespace android {
     32 
     33 FileSource::FileSource(const char *filename)
     34     : mFd(-1),
     35       mOffset(0),
     36       mLength(-1),
     37       mName("<null>"),
     38       mDecryptHandle(NULL),
     39       mDrmManagerClient(NULL),
     40       mDrmBufOffset(0),
     41       mDrmBufSize(0),
     42       mDrmBuf(NULL){
     43 
     44     if (filename) {
     45         mName = String8::format("FileSource(%s)", filename);
     46     }
     47     ALOGV("%s", filename);
     48     mFd = open(filename, O_LARGEFILE | O_RDONLY);
     49 
     50     if (mFd >= 0) {
     51         mLength = lseek64(mFd, 0, SEEK_END);
     52     } else {
     53         ALOGE("Failed to open file '%s'. (%s)", filename, strerror(errno));
     54     }
     55 }
     56 
     57 FileSource::FileSource(int fd, int64_t offset, int64_t length)
     58     : mFd(fd),
     59       mOffset(offset),
     60       mLength(length),
     61       mName("<null>"),
     62       mDecryptHandle(NULL),
     63       mDrmManagerClient(NULL),
     64       mDrmBufOffset(0),
     65       mDrmBufSize(0),
     66       mDrmBuf(NULL) {
     67     ALOGV("fd=%d (%s), offset=%lld, length=%lld",
     68             fd, nameForFd(fd).c_str(), (long long) offset, (long long) length);
     69 
     70     if (mOffset < 0) {
     71         mOffset = 0;
     72     }
     73     if (mLength < 0) {
     74         mLength = 0;
     75     }
     76     if (mLength > INT64_MAX - mOffset) {
     77         mLength = INT64_MAX - mOffset;
     78     }
     79     struct stat s;
     80     if (fstat(fd, &s) == 0) {
     81         if (mOffset > s.st_size) {
     82             mOffset = s.st_size;
     83             mLength = 0;
     84         }
     85         if (mOffset + mLength > s.st_size) {
     86             mLength = s.st_size - mOffset;
     87         }
     88     }
     89     if (mOffset != offset || mLength != length) {
     90         ALOGW("offset/length adjusted from %lld/%lld to %lld/%lld",
     91                 (long long) offset, (long long) length,
     92                 (long long) mOffset, (long long) mLength);
     93     }
     94 
     95     mName = String8::format(
     96             "FileSource(fd(%s), %lld, %lld)",
     97             nameForFd(fd).c_str(),
     98             (long long) mOffset,
     99             (long long) mLength);
    100 
    101 }
    102 
    103 FileSource::~FileSource() {
    104     if (mFd >= 0) {
    105         ::close(mFd);
    106         mFd = -1;
    107     }
    108 
    109     if (mDrmBuf != NULL) {
    110         delete[] mDrmBuf;
    111         mDrmBuf = NULL;
    112     }
    113 
    114     if (mDecryptHandle != NULL) {
    115         // To release mDecryptHandle
    116         CHECK(mDrmManagerClient);
    117         mDrmManagerClient->closeDecryptSession(mDecryptHandle);
    118         mDecryptHandle = NULL;
    119     }
    120 
    121     if (mDrmManagerClient != NULL) {
    122         delete mDrmManagerClient;
    123         mDrmManagerClient = NULL;
    124     }
    125 }
    126 
    127 status_t FileSource::initCheck() const {
    128     return mFd >= 0 ? OK : NO_INIT;
    129 }
    130 
    131 ssize_t FileSource::readAt(off64_t offset, void *data, size_t size) {
    132     if (mFd < 0) {
    133         return NO_INIT;
    134     }
    135 
    136     Mutex::Autolock autoLock(mLock);
    137 
    138     if (mLength >= 0) {
    139         if (offset >= mLength) {
    140             return 0;  // read beyond EOF.
    141         }
    142         uint64_t numAvailable = mLength - offset;
    143         if ((uint64_t)size > numAvailable) {
    144             size = numAvailable;
    145         }
    146     }
    147 
    148     if (mDecryptHandle != NULL && DecryptApiType::CONTAINER_BASED
    149             == mDecryptHandle->decryptApiType) {
    150         return readAtDRM(offset, data, size);
    151    } else {
    152         off64_t result = lseek64(mFd, offset + mOffset, SEEK_SET);
    153         if (result == -1) {
    154             ALOGE("seek to %lld failed", (long long)(offset + mOffset));
    155             return UNKNOWN_ERROR;
    156         }
    157 
    158         return ::read(mFd, data, size);
    159     }
    160 }
    161 
    162 status_t FileSource::getSize(off64_t *size) {
    163     Mutex::Autolock autoLock(mLock);
    164 
    165     if (mFd < 0) {
    166         return NO_INIT;
    167     }
    168 
    169     *size = mLength;
    170 
    171     return OK;
    172 }
    173 
    174 sp<DecryptHandle> FileSource::DrmInitialization(const char *mime) {
    175     if (getuid() == AID_MEDIA_EX) return nullptr; // no DRM in media extractor
    176     if (mDrmManagerClient == NULL) {
    177         mDrmManagerClient = new DrmManagerClient();
    178     }
    179 
    180     if (mDrmManagerClient == NULL) {
    181         return NULL;
    182     }
    183 
    184     if (mDecryptHandle == NULL) {
    185         mDecryptHandle = mDrmManagerClient->openDecryptSession(
    186                 mFd, mOffset, mLength, mime);
    187     }
    188 
    189     if (mDecryptHandle == NULL) {
    190         delete mDrmManagerClient;
    191         mDrmManagerClient = NULL;
    192     }
    193 
    194     return mDecryptHandle;
    195 }
    196 
    197 void FileSource::getDrmInfo(sp<DecryptHandle> &handle, DrmManagerClient **client) {
    198     handle = mDecryptHandle;
    199 
    200     *client = mDrmManagerClient;
    201 }
    202 
    203 ssize_t FileSource::readAtDRM(off64_t offset, void *data, size_t size) {
    204     size_t DRM_CACHE_SIZE = 1024;
    205     if (mDrmBuf == NULL) {
    206         mDrmBuf = new unsigned char[DRM_CACHE_SIZE];
    207     }
    208 
    209     if (mDrmBuf != NULL && mDrmBufSize > 0 && (offset + mOffset) >= mDrmBufOffset
    210             && (offset + mOffset + size) <= static_cast<size_t>(mDrmBufOffset + mDrmBufSize)) {
    211         /* Use buffered data */
    212         memcpy(data, (void*)(mDrmBuf+(offset+mOffset-mDrmBufOffset)), size);
    213         return size;
    214     } else if (size <= DRM_CACHE_SIZE) {
    215         /* Buffer new data */
    216         mDrmBufOffset =  offset + mOffset;
    217         mDrmBufSize = mDrmManagerClient->pread(mDecryptHandle, mDrmBuf,
    218                 DRM_CACHE_SIZE, offset + mOffset);
    219         if (mDrmBufSize > 0) {
    220             int64_t dataRead = 0;
    221             dataRead = size > static_cast<size_t>(mDrmBufSize) ? mDrmBufSize : size;
    222             memcpy(data, (void*)mDrmBuf, dataRead);
    223             return dataRead;
    224         } else {
    225             return mDrmBufSize;
    226         }
    227     } else {
    228         /* Too big chunk to cache. Call DRM directly */
    229         return mDrmManagerClient->pread(mDecryptHandle, data, size, offset + mOffset);
    230     }
    231 }
    232 
    233 /* static */
    234 bool FileSource::requiresDrm(int fd, int64_t offset, int64_t length, const char *mime) {
    235     std::unique_ptr<DrmManagerClient> drmClient(new DrmManagerClient());
    236     sp<DecryptHandle> decryptHandle =
    237             drmClient->openDecryptSession(fd, offset, length, mime);
    238     bool requiresDrm = false;
    239     if (decryptHandle != nullptr) {
    240         requiresDrm = decryptHandle->decryptApiType == DecryptApiType::CONTAINER_BASED;
    241         drmClient->closeDecryptSession(decryptHandle);
    242     }
    243     return requiresDrm;
    244 }
    245 
    246 }  // namespace android
    247