/*
    Generic interface for binary data parsing.
*/

#ifndef COM_BIN_H
#define COM_BIN_H

#include <stdint.h>

#include "buf.h"

#define COM_BIN_LIT_ENDIAN (1 << 0)
#define COM_BIN_BIG_ENDIAN (1 << 1)
#define COM_BIN_NAT_ENDIAN (1 << 2)

typedef struct com_bin_interface {
  /* Attempts to read exactly N bytes, returns false if it cannot. */
  bool (*readn)(void *ctx, char *into, uint32_t bytes);
  bool (*skipn)(void *ctx, uint32_t bytes);
} com_bin_interface;

typedef struct com_bin {
  struct com_bin_interface interface;
  void *ctx;
  uint32_t flags;
} com_bin;

bool com_bin_read_i16(com_bin *b, int16_t *value);
bool com_bin_read_u16(com_bin *b, uint16_t *value);
/*
  Read untyped bytes appending them to buffer.
  NOTE: Buffer must have typesz of 1. */
bool com_bin_read_bufb(com_bin *b, struct com_buf *buf, uint32_t bytes);
/*
  Inline byte buffer read, making a new buffer inside.
  Resulted index can be safely used in case of future reallocations.
  NOTE: Buffer must have typesz of 1. */
bool com_bin_read_bufbi(com_bin *b, struct com_buf *buf, uint32_t *index,
                        uint32_t bytes);

/* TODO: Typed variant, use buf for typesz? */
/* Skip N bytes. */
bool com_bin_skip(com_bin *b, uint32_t n);

#endif