flexnbd-c/src/proxy/prefetch.h

#ifndef PREFETCH_H
#define PREFETCH_H

#include <stdint.h>
#include <stddef.h>

#define PREFETCH_BUFSIZE 4096

struct prefetch {
	/* True if there is data in the buffer. */
        int is_full;
	/* The start point of the current content of buffer */
        uint64_t from;
	/* The length of the current content of buffer */
        uint32_t len;

	/* The total size of the buffer, in bytes. */
	size_t size;

        char *buffer;
};

struct prefetch* prefetch_create( size_t size_bytes );
void prefetch_destroy( struct prefetch *prefetch );
size_t prefetch_size( struct prefetch *);
void prefetch_set_is_empty( struct prefetch *prefetch );
void prefetch_set_is_full( struct prefetch *prefetch );
void prefetch_set_full( struct prefetch *prefetch, int val );
int prefetch_is_full( struct prefetch *prefetch );
int prefetch_contains( struct prefetch *prefetch, uint64_t from, uint32_t len );
char *prefetch_offset( struct prefetch *prefetch, uint64_t from );

#endif