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Buffer Iterating

const int width = 640, height = 640, channels = 3;
const size_t frame_size = width * height * channels;
vector<char> frame_buffer(frame_size);
vector<float> input_tensor_values(1 * channels * height * width);while (TRUE) {cin.read(reinterpret_cast<char*>(frame_buffer.data()), frame_size);size_t bytes_read = cin.gcount();if (bytes_read == 0) break;if (bytes_read != frame_size) {cerr << "Error : " << frame_size << "，Read : " << bytes_read << endl;break;}// ⇒ float ⇒ Normalization (HWC : Height-Width-Channel)for (size_t i = 0; i < frame_buffer.size(); ++i) {input_tensor_values[i] = static_cast<float>(static_cast<unsigned char>(frame_buffer[i])) / 255.0f;}// ⇒ CHW                    (CHW : Channel-Height-Width)for (int c = 0; c < channels; ++c) {for (int h = 0; h < height; ++h) {for (int w = 0; w < width; ++w) {int src_idx = (h * width + w) * channels + c;int dst_idx = c * height * width + h * width + w;input_tensor_values[dst_idx] = frame_buffer[src_idx];}}}// .T.B.D.
}