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#ifndef BUFFER_H
#define BUFFER_H
#include "stdint.h"
/* @file */
/**
* A buffer
*
* @c start and @c end denote the real boundaries of the buffer, and
* are physical addresses. @c fill denotes the offset to the first
* free block in the buffer. (If the buffer is full, @c fill will
* equal @c end-start.)
*
*/
struct buffer {
physaddr_t start; /**< Start of buffer in memory */
physaddr_t end; /**< End of buffer in memory */
off_t fill; /**< Offset to first gap in buffer */
};
/**
* A free block descriptor.
*
* See \ref buffer_int for a full description of the fields.
*
*/
struct buffer_free_block {
char tail; /**< Tail byte marker */
physaddr_t next_free; /**< Address of next free block */
physaddr_t end; /**< End of this block */
} __attribute__ (( packed ));
/* Functions in buffer.c */
extern void init_buffer ( struct buffer *buffer );
extern int fill_buffer ( struct buffer *buffer, const void *data,
off_t offset, size_t len );
#endif /* BUFFER_H */
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