#ifndef TLS_BUFFER_H_
#define TLS_BUFFER_H_ 1

#include <stdint.h>
#include <string.h>
#include <errno.h>

/* flags:
 * 0x1 secure: zero memory when used
 * 0x2 fixed: buffer doesn't belong to you, and size says how big it is
 * 0x4 
 */
struct tls_buffer {
	char *buffer;
	size_t len;
	size_t size;
	int32_t error;
	uint32_t flags;
};

struct tls_buffer_reader {
	struct tls_buffer b;
	size_t cursor;
};

uint32_t tls_buffer_next3(struct tls_buffer_reader *rb);
uint16_t tls_buffer_next2(struct tls_buffer_reader *rb);
uint8_t tls_buffer_next(struct tls_buffer_reader *rb);
void tls_buffer_nextn(struct tls_buffer_reader *rb, unsigned char *b, size_t n);

void tls_buffer_init(struct tls_buffer *b, size_t initial); 

/* makes sure there's at least need bytes free */
void tls_buffer_expand(struct tls_buffer *b, size_t need);
void tls_buffer_free(struct tls_buffer *b);
void tls_buffer_set(struct tls_buffer *buffer, int ch);
void tls_buffer_compact(struct tls_buffer *b);
void tls_buffer_append(struct tls_buffer *b, const unsigned char *bytes, size_t n);
void tls_buffer_append_str(struct tls_buffer *b, const unsigned char *bytes);
void tls_buffer_append16(struct tls_buffer *b, uint16_t n);
void tls_buffer_append24(struct tls_buffer *b, uint32_t n);
void tls_buffer_append_byte(struct tls_buffer *b, uint8_t n);
void tls_buffer_shift(struct tls_buffer *b, size_t n);
void tls_buffer_write16(struct tls_buffer *b, uint16_t n, size_t at);
void tls_buffer_writebe(struct tls_buffer *b, int bytes, size_t at, uint64_t val);
uint64_t tls_buffer_readbe(struct tls_buffer *b, int bytes, size_t at);

/* make room at the beginning */
void tls_buffer_unshift(struct tls_buffer *b, size_t n);

#endif