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/* geometry.h - Device and file geometry computation */
/* Copyright 1992-1995 Werner Almesberger. See file COPYING for details. */
#ifndef GEOMETRY_H
#define GEOMETRY_H
#include "lilo.h"
typedef struct {
int device,heads;
int cylinders,sectors;
int start; /* partition offset */
int spb; /* sectors per block */
int fd,file;
int boot; /* non-zero after geo_open_boot */
} GEOMETRY;
void geo_init(char *name);
/* Loads the disk geometry table. */
int is_first(int device);
/* Returns a non-zero integer if the specified device could be the first (i.e.
boot) disk, zero otherwise. */
void geo_get(GEOMETRY *geo,int device,int user_device,int all);
/* Obtains geometry information of the specified device. Sets the BIOS device
number to user_device unless -1. If ALL is zero, only the BIOS device number
is retrieved and the other geometry information is undefined. */
int geo_open(GEOMETRY *geo,char *name,int flags);
/* Opens the specified file or block device, obtains the necessary geometry
information and returns the file descriptor. If the name contains a BIOS
device specification (xxx:yyy), it is removed and stored in the geometry
descriptor. Returns the file descriptor of the opened object. */
int geo_open_boot(GEOMETRY *geo,char *name);
/* Like get_open, but only the first sector of the device is accessed. This
way, no geometry information is needed. */
void geo_close(GEOMETRY *geo);
/* Closes a file or device that has previously been opened by geo_open. */
int geo_comp_addr(GEOMETRY *geo,int offset,SECTOR_ADDR *addr);
/* Determines the address of the disk sector that contains the offset'th
byte of the specified file or device. Returns a non-zero value if such
a sector exists, zero if it doesn't. */
int geo_find(GEOMETRY *geo,SECTOR_ADDR addr);
/* lseeks in the file associated with GEO for the sector at address ADDR.
Returns a non-zero integer on success, zero on failure. */
#endif
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