cbor_codec.h

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#ifndef CBOR_CODEC_H
#define CBOR_CODEC_H
 
#include <stdint.h>
#include <stddef.h>
 
/* ── CBOR major types (high 3 bits of initial byte) ─────────────────── */
 
#define CB_MAJOR_UINT    0  /* Major type 0: unsigned integer */
#define CB_MAJOR_NINT    1  /* Major type 1: negative integer */
#define CB_MAJOR_BSTR    2  /* Major type 2: byte string */
#define CB_MAJOR_TSTR    3  /* Major type 3: text string (UTF-8) */
#define CB_MAJOR_ARRAY   4  /* Major type 4: array */
#define CB_MAJOR_MAP     5  /* Major type 5: map */
#define CB_MAJOR_TAG     6  /* Major type 6: semantic tag */
#define CB_MAJOR_SIMPLE  7  /* Major type 7: simple/float */
 
/* Initial byte = (major << 5) | additional_info */
#define CB_INITIAL(major, ai)  (((major) << 5) | (ai))
 
/* ── Additional information values ──────────────────────────────────── */
 
#define CB_AI_1BYTE      24  /* Next 1 byte is the value/length */
#define CB_AI_2BYTE      25  /* Next 2 bytes */
#define CB_AI_4BYTE      26  /* Next 4 bytes */
#define CB_AI_8BYTE      27  /* Next 8 bytes */
 
/* ── Simple values (major type 7) ───────────────────────────────────── */
 
#define CB_FALSE         CB_INITIAL(7, 20)  /* 0xf4 */
#define CB_TRUE          CB_INITIAL(7, 21)  /* 0xf5 */
#define CB_NULL          CB_INITIAL(7, 22)  /* 0xf6 */
#define CB_UNDEFINED     CB_INITIAL(7, 23)  /* 0xf7 */
 
/* ── Float markers (major type 7) ───────────────────────────────────── */
 
#define CB_FLOAT16       CB_INITIAL(7, 25)  /* 0xf9 — half-precision */
#define CB_FLOAT32       CB_INITIAL(7, 26)  /* 0xfa */
#define CB_FLOAT64       CB_INITIAL(7, 27)  /* 0xfb */
 
/* ── Reader context ─────────────────────────────────────────────────── */
 
struct cb_reader {
    const unsigned char *data;
    size_t len;
    size_t pos;
};
 
#endif /* CBOR_CODEC_H */