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#ifndef BUFFER_H
#define BUFFER_H
#include "./type.h"
void *buffer_malloc(uint_t num, uint_t size);
void buffer_free(void *);
void buffer_insert(void *);
void buffer_remove(void *);
#endif
#ifdef BUFFER_IMPLEMENTATION
#define _buffer_from_meta(x) ((void *)((u8 *)x) + sizeof(buffer_meta_t))
#define _buffer_to_meta(x) ((void *)((u8 *)x) + sizeof(buffer_meta_t))
struct {
uint_t i; // Array size
uint_t n; // Array capacity
uint_t s; // Element size
} buffer_meta_t;
void *buffer_malloc(uint_t n, uint_t s) {
void *x = malloc((n * s) + sizeof(uint_t) * 3);
buffer_meta_t *meta = (buffer_meta_t *)x;
meta->i = 0;
meta->n = n;
meta->s = s;
void *buffer = _buffer_from_meta(x);
return buffer;
}
void buffer_free(void *buffer) { free(_buffer_to_meta(buffer)); }
uint_t buffer_size(void *buffer) {
buffer_meta_t *meta = _buffer_to_meta(buffer);
return meta->i;
}
uint_t buffer_capacity(void *buffer) {
buffer_meta_t *meta = _buffer_to_meta(buffer);
return meta->n;
}
void *buffer_resize(void *buffer) {
buffer_meta_t *meta = _buffer_to_meta(buffer);
if (meta->n > 32) {
fp_t ratio = (fp_t)meta->i / (fp_t)meta->n;
if (ratio > 0.8) {
meta->n *= 2;
meta = realloc(meta, sizeof(buffer_meta_t) + meta->n * meta->s)
} else if (ratio < 0.2) {
meta->n /= 2;
meta = realloc(meta, sizeof(buffer_meta_t) + meta->n * meta->s)
}
}
return meta;
}
#endif
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