ssize_t FileSource::readAt(off64_t offset, void *data, size_t size) {
if (mFd < 0) {
return NO_INIT;
}
Mutex::Autolock autoLock(mLock);
if (mLength >= 0) {
if (offset >= mLength) {
return 0; // read beyond EOF.
}
uint64_t numAvailable = mLength - offset;
if ((uint64_t)size > numAvailable) {
size = numAvailable;
}
}
if (mDecryptHandle != NULL && DecryptApiType::CONTAINER_BASED
== mDecryptHandle->decryptApiType) {
return readAtDRM(offset, data, size);
} else {
off64_t result = lseek64(mFd, offset + mOffset, SEEK_SET);
if (result == -1) {
ALOGE("seek to %lld failed", (long long)(offset + mOffset));
return UNKNOWN_ERROR;
}
return ::read(mFd, data, size);
}
}
ssize_t FileSource::readAt(off_t offset, void *data, size_t size) {
if (mFile == NULL) {
return NO_INIT;
}
Mutex::Autolock autoLock(mLock);
if (mLength >= 0) {
if (offset >= mLength) {
return 0; // read beyond EOF.
}
int64_t numAvailable = mLength - offset;
if ((int64_t)size > numAvailable) {
size = numAvailable;
}
}
if (mDecryptHandle != NULL && DecryptApiType::CONTAINER_BASED
== mDecryptHandle->decryptApiType) {
return readAtDRM(offset, data, size);
} else {
int err = fseeko(mFile, offset + mOffset, SEEK_SET);
if (err < 0) {
LOGE("seek to %lld failed", offset + mOffset);
return UNKNOWN_ERROR;
}
return fread(data, 1, size, mFile);
}
}