big merge

components/spotify/cspot/include/AudioChunk.h

@@ -0,0 +1,74 @@
+#ifndef AUDIOCHUNK_H
+#define AUDIOCHUNK_H
+#include <memory>
+#include <vector>
+#include <string>
+#include <algorithm>
+#include "pthread.h"
+#include "platform/WrappedSemaphore.h"
+#include "Crypto.h"
+#include "Utils.h"
+#include <mutex>
+
+class AudioChunk {
+private:
+    /**
+     * @brief Calculates a correct IV by performing bignum addition.
+     * 
+     * @param num Number to add to IV.
+     * @return std::vector<uint8_t> 
+     */
+    std::vector<uint8_t> getIVSum(uint32_t num);
+
+public:
+    std::unique_ptr<Crypto> crypto;
+    std::vector<uint8_t> decryptedData;
+    std::vector<uint8_t> audioKey;
+    bool keepInMemory = false;
+    pthread_mutex_t loadingMutex;
+    std::mutex dataAccessMutex;
+    uint32_t startPosition;
+    uint32_t endPosition;
+    uint16_t seqId;
+
+    size_t headerFileSize = -1;
+    bool isLoaded = false;
+    bool isFailed = false;
+
+    /**
+     * @brief Triggered when audiochunk is fully downloaded and decrypted.
+     */
+    std::unique_ptr<WrappedSemaphore> isLoadedSemaphore;
+
+    /**
+     * @brief 
+     */
+    std::unique_ptr<WrappedSemaphore> isHeaderFileSizeLoadedSemaphore;
+
+
+    /**
+     * @brief AudioChunk handles all audiochunk related operations.
+     * 
+     * @param seqId Sequence id of requested chunk
+     * @param audioKey Audio key used for decryption of audio data
+     * @param startPosition Start position of current chunk in audio file
+     * @param predictedEndPosition Predicted end position of given chunk. This is not final positon.
+     */
+    AudioChunk(uint16_t seqId, std::vector<uint8_t> &audioKey, uint32_t startPosition, uint32_t predictedEndPosition);
+    ~AudioChunk();
+
+    /**
+     * @brief Appends incoming chunked data to local cache.
+     * 
+     * @param data encrypted binary audio data.
+     */
+    void appendData(std::vector<uint8_t> &data);
+
+    /**
+     * @brief Performs AES CTR decryption of received data.
+     * 
+     */
+    void decrypt();
+};
+
+#endif