EMILE/libemile/emile_map_read.c

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static __attribute__((used)) char* rcsid = "$CVSHeader$";
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/*
*
* (c) 2004 Laurent Vivier <Laurent@lvivier.info>
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*
*/
#include <sys/types.h>
#include <unistd.h>
#include "partition.h"
#include "libemile.h"
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#include "emile.h"
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int emile_map_read(emile_map_t *map, int part)
{
off_t offset;
int ret;
if (map->current == part)
return part;
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if (part > read_long(&map->partition.MapBlkCnt))
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return -1;
offset = part * sizeof(struct Partition) + sizeof(struct DriverDescriptor);
ret = lseek(map->fd, offset, SEEK_SET);
if (ret != offset)
return -1;
ret = read(map->fd, &map->partition, sizeof(struct Partition));
if (ret != sizeof(struct Partition))
return -1;
map->current = part;
return part;
}