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 #ifndef BUFFER_H

 #define	BUFFER_H

 #include <stdio.h>

 #ifdef	__cplusplus

 extern "C" {

 #endif

 /* the user shall not modify values */

 typedef struct UcxBuffer UcxBuffer;

 UcxBuffer *ucx_buffer_new(void *space, size_t length);

 void ucx_buffer_free(UcxBuffer* buffer);

 /*

  * Moves the position of the buffer to a new position relative to whence.

  *

  * SEEK_SET marks the start of the buffer

  * SEEK_CUR marks the current position

  * SEEK_END marks the first 0-byte in the buffer

  *

  * ucx_memseek returns 0 on success and -1 if the new position is beyond the

  * bounds of the allocated buffer. In that case the position of the buffer

  * remains unchanged.

  *

  */

 int ucx_buffer_seek(UcxBuffer *buffer, off_t offset, int whence);

 size_t ucx_buffer_tell(UcxBuffer *buffer);

 /*

  * returns non-zero, iff the current buffer position has exceeded the last

  * available byte of the underlying buffer

  *

  */

 int ucx_buffer_eof(UcxBuffer *buffer);

 size_t ucx_bufio(void *d, size_t s, size_t n, UcxBuffer* b, _Bool read);

 #define ucx_buffer_write(data, itemsize, nitems, buffer) \

     ucx_bufio(data, itemsize, nitems, buffer, 0)

 #define ucx_buffer_read(data, itemsize, nitems, buffer) \

         ucx_bufio(data, itemsize, nitems, buffer, 1)

 int ucx_buffer_putc(UcxBuffer *b, int c);

 int ucx_buffer_getc(UcxBuffer *b);

 #ifdef	__cplusplus

 }

 #endif

 #endif	/* BUFFER_H */