LargeBlobStore.h

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#pragma once
 
#include <cstddef>
#include <cstdint>
 
namespace cdc::mod_fido2 {

inline constexpr uint16_t kLargeBlobMaxArray = 1024;

inline constexpr uint16_t kLargeBlobEmptyLen = 17;

extern const uint8_t kLargeBlobEmpty[kLargeBlobEmptyLen];

enum class LbResult : uint8_t {
    Ok,
    StorageFull,  
    BadLength,    
    BadSeq,       
};

class LargeBlobWriteSession {
public:
    void reset();

    LbResult begin(uint8_t* buffer, uint16_t capacity, uint32_t totalLength);

    LbResult append(uint32_t offset, const uint8_t* data, uint16_t len);

    bool complete() const { return active_ && received_ == expected_; }
    bool active() const { return active_; }
    uint16_t nextOffset() const { return received_; }
    const uint8_t* data() const { return buffer_; }
    uint16_t length() const { return expected_; }
 
private:
    uint8_t* buffer_ = nullptr;
    uint16_t capacity_ = 0;
    uint16_t expected_ = 0;
    uint16_t received_ = 0;
    bool active_ = false;
};
 
}  // namespace cdc::mod_fido2