#ifndef BOKF_UTIL_H
#define BOKF_UTIL_H

#include <stddef.h>
#include <stdint.h>
#include <time.h>

void *xmalloc(size_t n);
void *xcalloc(size_t n, size_t sz);
void *xrealloc(void *p, size_t n);
char *xstrdup(const char *s);

struct buf {
    unsigned char *p;
    size_t len, cap;
};

void buf_init(struct buf *b);
void buf_free(struct buf *b);
void buf_append(struct buf *b, const void *data, size_t n);
void buf_append_u16be(struct buf *b, uint16_t v);
void buf_append_u32be(struct buf *b, uint32_t v);
void buf_append_u64be(struct buf *b, uint64_t v);

void util_sha256(const void *data, size_t n, unsigned char out[32]);
void util_hex(const unsigned char *in, size_t n, char *out);
char *util_b64url(const unsigned char *in, size_t n);
char *util_b64(const unsigned char *in, size_t n);
int util_random(void *out, size_t n);
char *util_random_id(const char *prefix, size_t nbytes);
int util_const_eq(const void *a, const void *b, size_t n);
int64_t util_now(void);
void util_iso8601(int64_t t, char *buf, size_t n);
char *util_str_trim(char *s);
int util_parse_iso_date(const char *s);

/* base64 (standard alphabet, padding required) */
int util_b64_decode(const char *in, size_t in_len, unsigned char **out,
                    size_t *out_len);

/* date helpers, all dates "YYYY-MM-DD" */
int util_date_parse(const char *s, int *y, int *m, int *d);
void util_date_fmt(int y, int m, int d, char *buf, size_t n);
int util_days_in_month(int y, int m);
void util_date_add_months(const char *date, int months, char *out, size_t n);
void util_date_add_days(const char *date, int days, char *out, size_t n);
int util_date_valid(const char *s);

/* encoding conversion for SIE files (IBM PC8 / CP437) */
size_t util_utf8_to_cp437(const char *in, unsigned char *out, size_t out_sz);
char *util_cp437_to_utf8(const unsigned char *in, size_t n);

#endif