#ifndef IOBUFFER_H_INCLUDED
#define IOBUFFER_H_INCLUDED

typedef struct {
    char* iodata; //if not null, always 16 byte alignment for better AES encrypt
    int size;
    int capacity; //capacity, always >= size
} iobuffer;

void iobuffer_init(iobuffer* p);
void iobuffer_deinit(iobuffer* p);

/* 申请cap大小的缓冲 */
int  iobuffer_reserve(iobuffer* p, int cap);

/* 获取剩余缓冲的大小 */
int  iobuffer_freesize(iobuffer* p);

/* to后的data移到from位置 */
void iobuffer_erase(iobuffer* p, int from, int to);


/* 设置size=0， 清除所有data */
void iobuffer_eraseall(iobuffer* p);

/* 读size大小的数据到to的内存 */
void iobuffer_read(iobuffer* p, void* to, int size);

/* 插入字符串 */
int iobuffer_append_string(iobuffer* p, const void* str);

/* 插入数据 */
int iobuffer_appendData(iobuffer* p, const void* iodata, int count);

/* 插入格式打印：iobuffer_printf(p, "i m %s, years old", "liming", 5)*/
int iobuffer_printf(iobuffer* p, const char *format, ...) __attribute__((__format__ (printf, 2, 3)));/* first arg is this pointer */
	

// Don't call it but change your code logic
// int iobuffer_prependData(iobuffer* p, const void* iodata, int count);

#endif /* IOBUFFER_H_INCLUDED */