t1_state.h

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#pragma once
#include "mod_gpg/openpgp/t1/t1_block.h"
 
#ifdef __cplusplus
extern "C" {
#endif

#ifndef T1_MAX_APDU_LEN
#define T1_MAX_APDU_LEN 4096
#endif

#ifndef T1_MAX_RESPONSE_LEN
#define T1_MAX_RESPONSE_LEN 4096
#endif

typedef enum {
    T1_FEED_NEED_OUT,    
    T1_FEED_APDU_READY,  
    T1_FEED_WAIT_MORE,   
    T1_FEED_IGNORED,     
} t1_feed_t;

typedef struct {
    /* Sequence-number bookkeeping. */
    uint8_t ns_send;       
    uint8_t ns_expected;   
 
    /* Negotiated frame sizes. */
    uint16_t ifsc;         
    uint16_t ifsd;         
 
    /* EDC selection (driven by ATR / protocol parameters). */
    bool use_crc;
 
    /* Reassembly buffer for incoming chained APDU. */
    uint8_t apdu_buf[T1_MAX_APDU_LEN];
    size_t  apdu_len;
    bool    apdu_in_progress;
 
    /* Outgoing response chunking. */
    uint8_t resp_buf[T1_MAX_RESPONSE_LEN];
    size_t  resp_len;
    size_t  resp_sent;
    bool    resp_pending;
 
    /* Pending control reply (R / S block) — drained before resp_buf chunks. */
    uint8_t control_block[T1_INF_MAX + 5]; /* worst case: NAD+PCB+LEN + INF + 2-byte CRC */
    size_t  control_len;
} t1_state_t;

void t1_state_init(t1_state_t *state, bool use_crc);

t1_feed_t t1_state_feed(t1_state_t *state, const t1_block_t *block);

bool t1_state_queue_response(t1_state_t *state, const uint8_t *resp, size_t resp_len);

size_t t1_state_next_outbound(t1_state_t *state, uint8_t *out, size_t out_cap);
 
#ifdef __cplusplus
}
#endif