#pragma once
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>

// Pulls complete JPEG files out of an arbitrary byte stream (single image,
// MJPEG multipart, junk in between) by walking the marker structure, so an
// EOI inside an EXIF thumbnail can't truncate a frame.
typedef struct {
    int state;
    uint8_t marker;
    uint32_t remaining;
    uint8_t *out;
    size_t out_len, out_cap;
    size_t skipped;      // bytes discarded while hunting for SOI
} jpegframe_t;

void jpegframe_init(jpegframe_t *f, uint8_t *out, size_t out_cap);
void jpegframe_reset(jpegframe_t *f);
// Consumes input; returns the number of bytes used. *complete is set when
// out[0..out_len) holds a whole JPEG (unused input stays for the next call).
// *overflow is set if a frame outgrew the buffer; the extractor then resyncs.
size_t jpegframe_feed(jpegframe_t *f, const uint8_t *in, size_t n, bool *complete, bool *overflow);