buff.h

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#ifndef HAT_BUFF_H
#define HAT_BUFF_H
 
#include <stdint.h>
#include <string.h>
 
#define HAT_BUFF_SUCCESS 0
#define HAT_BUFF_ERROR (-1)
 
#ifdef __cplusplus
extern "C" {
#endif
 
typedef struct {
    uint8_t *data;
    size_t size;
    size_t pos;
} hat_buff_t;
 
 
static inline size_t hat_buff_available(hat_buff_t *buff) {
    return (buff && buff->size > buff->pos) ? buff->size - buff->pos : 0;
}
 
static inline int hat_buff_write(hat_buff_t *buff, uint8_t *data,
                                 size_t data_len) {
    if (hat_buff_available(buff) < data_len)
        return HAT_BUFF_ERROR;
    memcpy(buff->data + buff->pos, data, data_len);
    buff->pos += data_len;
    return HAT_BUFF_SUCCESS;
}
 
static inline uint8_t *hat_buff_read(hat_buff_t *buff, size_t size) {
    if (hat_buff_available(buff) < size)
        return NULL;
    uint8_t *data = buff->data + buff->pos;
    buff->pos += size;
    return data;
}
 
#ifdef __cplusplus
}
#endif
 
#endif