// For dng_stream
void read(void* data, uint32 count, uint64 offset) {
if (count == 0 && offset == 0) {
return;
}
size_t sum;
if (!safe_add_to_size_t(static_cast<uint64>(count), offset, &sum) ||
!this->bufferMoreData(sum)) {
ThrowReadFile();
}
if (!fStreamBuffer.read(data, static_cast<size_t>(offset), count)) {
ThrowReadFile();
}
}
void DoRead(void* data, uint32 count, uint64 offset) override {
size_t sum;
if (!safe_add_to_size_t(static_cast<uint64>(count), offset, &sum) ||
!fStream->read(data, static_cast<size_t>(offset), static_cast<size_t>(count))) {
ThrowReadFile();
}
}
uint64 getLength() override {
if (!this->bufferMoreData(kReadToEnd)) { // read whole stream
ThrowReadFile();
}
return fStreamBuffer.bytesWritten();
}