#ifndef _BUFFER_H_#define _BUFFER_H_typedef struct buffer{  char *p;			// point to buffer  unsigned long size;		// size  unsigned long length;		// payload length  unsigned long maxsize;	//} buffer_t;buffer_t *buffer_create(unsigned long size, unsigned long maxsize);void buffer_destroy(buffer_t * buf);int buffer_resize(buffer_t * buf, int newsize);int buffer_append_data(buffer_t * buf, char *data, unsigned long length);char *buffer_fetch_data(buffer_t * buf, unsigned long length, unsigned long *rlength);int buffer_remove_data(buffer_t * buf, unsigned long length);#endif