#ifndef ZPM_BUFFER_H_
#define ZPM_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 zpm_buffer {
	char *buffer;
	size_t len;
	size_t size;
	int32_t error;
	uint32_t flags;
};

struct zpm_buffer_reader {
	struct zpm_buffer b;
	size_t cursor;
};

uint32_t zpm_buffer_next3(struct zpm_buffer_reader *rb);
uint16_t zpm_buffer_next2(struct zpm_buffer_reader *rb);
uint8_t zpm_buffer_next(struct zpm_buffer_reader *rb);
void zpm_buffer_nextn(struct zpm_buffer_reader *rb, unsigned char *b, size_t n);

void zpm_buffer_init(struct zpm_buffer *b); 

/* makes sure there's at least need bytes free */
void zpm_buffer_expand(struct zpm_buffer *b, size_t need);
void zpm_buffer_free(struct zpm_buffer *b);
void zpm_buffer_set(struct zpm_buffer *buffer, int ch);
void zpm_buffer_compact(struct zpm_buffer *b);
void zpm_buffer_append(struct zpm_buffer *b, const unsigned char *bytes, size_t n);
void zpm_buffer_appendf(struct zpm_buffer *b, const char *fmt, ...);
void zpm_buffer_appendvf(struct zpm_buffer *b, const char *fmt, va_list ap);
void zpm_buffer_append_str(struct zpm_buffer *b, const char *s);
void zpm_buffer_append16(struct zpm_buffer *b, uint16_t n);
void zpm_buffer_append24(struct zpm_buffer *b, uint32_t n);
void zpm_buffer_append_byte(struct zpm_buffer *b, uint8_t n);
void zpm_buffer_shift(struct zpm_buffer *b, size_t n);
void zpm_buffer_write16(struct zpm_buffer *b, uint16_t n, size_t at);
void zpm_buffer_writebe(struct zpm_buffer *b, int bytes, size_t at, uint64_t val);
uint64_t zpm_buffer_readbe(struct zpm_buffer *b, int bytes, size_t at);

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

#endif