src/cache/backing.h


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#pragma once

#include <al/types.h>
#include <al/array.h>

enum {
    CACHE_BACKING_READ = 0,
    CACHE_BACKING_MAPPED
};

struct cch_range {
    off_t start;
    off_t end;
};

struct cch_backing {
    u8 mode;
    off_t size;
    array(struct cch_range) available;
    void (*lock)(struct cch_backing *);
    void (*write)(struct cch_backing *, u8 *, off_t, size_t *);
    void (*read)(struct cch_backing *, u8 *, off_t, size_t *);
    u8 *(*get_ptr)(struct cch_backing *, off_t, size_t *);
    void (*unlock)(struct cch_backing *);
    void (*set_size)(struct cch_backing *, off_t, bool);
    off_t (*get_size_if_known)(struct cch_backing *);
    void (*finalize)(struct cch_backing *);
    void (*free)(struct cch_backing **);
};