add missing files, removing un-nedded ones

components/spotify/cspot/include/CDNAudioFile.h

@@ -0,0 +1,90 @@
+#pragma once
+
+#include <cstddef>  // for size_t
+#include <cstdint>  // for uint8_t
+#include <memory>   // for shared_ptr, unique_ptr
+#include <string>   // for string
+#include <vector>   // for vector
+
+#include "Crypto.h"      // for Crypto
+#include "HTTPClient.h"  // for HTTPClient
+
+namespace bell {
+class WrappedSemaphore;
+}  // namespace bell
+
+namespace cspot {
+class AccessKeyFetcher;
+
+class CDNAudioFile {
+
+ public:
+  CDNAudioFile(const std::string& cdnUrl, const std::vector<uint8_t>& audioKey);
+
+  /**
+  * @brief Opens connection to the provided cdn url, and fetches track metadata.
+  */
+  void openStream();
+
+  /**
+  * @brief Read and decrypt part of the cdn stream
+  *
+  * @param dst buffer where to read received data to
+  * @param amount of bytes to read
+  *
+  * @returns amount of bytes read
+  */
+  size_t readBytes(uint8_t* dst, size_t bytes);
+
+  /**
+  * @brief Returns current position in CDN stream
+  */
+  size_t getPosition();
+
+  /**
+  * @brief returns total size of the audio file in bytes
+  */
+  size_t getSize();
+
+  /**
+  * @brief Seeks the track to provided position
+  * @param position position where to seek the track
+  */
+  void seek(size_t position);
+
+ private:
+  const int OPUS_HEADER_SIZE = 8 * 1024;
+  const int OPUS_FOOTER_PREFFERED = 1024 * 12;  // 12K should be safe
+  const int SEEK_MARGIN_SIZE = 1024 * 4;
+
+  const int HTTP_BUFFER_SIZE = 1024 * 14;
+  const int SPOTIFY_OPUS_HEADER = 167;
+
+  // Used to store opus metadata, speeds up read
+  std::vector<uint8_t> header = std::vector<uint8_t>(OPUS_HEADER_SIZE);
+  std::vector<uint8_t> footer;
+
+  // General purpose buffer to read data
+  std::vector<uint8_t> httpBuffer = std::vector<uint8_t>(HTTP_BUFFER_SIZE);
+
+  // AES IV for decrypting the audio stream
+  const std::vector<uint8_t> audioAESIV = {0x72, 0xe0, 0x67, 0xfb, 0xdd, 0xcb,
+                                           0xcf, 0x77, 0xeb, 0xe8, 0xbc, 0x64,
+                                           0x3f, 0x63, 0x0d, 0x93};
+  std::unique_ptr<Crypto> crypto;
+
+  std::unique_ptr<bell::HTTPClient::Response> httpConnection;
+
+  size_t position = 0;
+  size_t totalFileSize = 0;
+  size_t lastRequestPosition = 0;
+  size_t lastRequestCapacity = 0;
+
+  bool enableRequestMargin = false;
+
+  std::string cdnUrl;
+  std::vector<uint8_t> audioKey;
+
+  void decrypt(uint8_t* dst, size_t nbytes, size_t pos);
+};
+}  // namespace cspot