#ifndef __CHAINBUFFER_H__
#define __CHAINBUFFER_H__

#include <stddef.h>
#include <stdint.h>
#include <sys/types.h>

typedef struct chain_buffer_node chain_buffer_node_t;

typedef struct chain_buffer_s {
    chain_buffer_node_t *head;
    chain_buffer_node_t *tail;
    size_t total_len;
    size_t chunk_size;
    uint8_t *linear_cache;
    size_t linear_cap;
} chain_buffer_t;

void chain_buffer_init(chain_buffer_t *buf, size_t chunk_size);
void chain_buffer_reset(chain_buffer_t *buf);

size_t chain_buffer_len(const chain_buffer_t *buf);
int chain_buffer_append(chain_buffer_t *buf, const void *data, size_t len);
size_t chain_buffer_drain(chain_buffer_t *buf, size_t len);

const uint8_t *chain_buffer_linearize(chain_buffer_t *buf, size_t *out_len);
ssize_t chain_buffer_send_fd(chain_buffer_t *buf, int fd, int flags);

#endif