#ifndef BUFFER_H
#define BUFFER_H

#include <sys/types.h> /* need type: ssize_t */

typedef struct buffer {
  char *x;
  unsigned int p;
  size_t n;
  int fd;
  ssize_t (*op)();
} buffer;

#define BUFFER_INIT(op, fd, buf, len) {(buf), 0, (len), (fd), (op)}

#define BUFFER_SMALL   256
#define BUFFER_INSIZE  8192
#define BUFFER_OUTSIZE 8192
#define BUFFER_MTUSIZE 1450

extern void buffer_init(buffer *, ssize_t (*op)(), int, char *, size_t);

extern int buffer_flush(buffer *);
extern int buffer_put(buffer *, const char *, size_t);
extern int buffer_putalign(buffer *, const char *, size_t);
extern int buffer_putflush(buffer *, const char *, size_t);
extern int buffer_puts(buffer *, const char *);
extern int buffer_putsalign(buffer *, const char *);
extern int buffer_putsflush(buffer *, const char *);

#define buffer_PUTC(s, c) (((s)->n != (s)->p) ? ((s)->x[(s)->p++] = (c), 0) : buffer_put((s), &(c), 1))

extern int buffer_get(buffer *, char *, size_t);
extern int buffer_bget(buffer *, char *, size_t);
extern int buffer_feed(buffer *);

extern char *buffer_peek(buffer *);
extern void buffer_seek(buffer *, size_t);

#define buffer_PEEK(s)      ((s)->x + (s)->n)
#define buffer_SEEK(s, len) (((s)->p -= (len)), ((s)->n += (len)))

#define buffer_GETC(s, c) \
  (((s)->p > 0) ? (*(c) = (s)->x[(s)->n], buffer_SEEK((s), 1), 1) : buffer_get((s), (c), 1))

extern int buffer_copy(buffer *, buffer *);

extern ssize_t buffer_unixread(int, char *, size_t);
extern ssize_t buffer_unixwrite(int, char *, size_t);

extern buffer *buffer_0;
extern buffer *buffer_1;
extern buffer *buffer_2;
extern buffer *buffer_0small;
extern buffer *buffer_1small;
extern buffer *buffer_2small;

#endif