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37 lines
626 B
C
37 lines
626 B
C
/*
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*
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* (c) 2004-2007 Laurent Vivier <Laurent@lvivier.info>
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*
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*/
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#include <sys/types.h>
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#include <unistd.h>
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#include "libmap.h"
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int map_read(map_t *map, int part)
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{
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off_t offset;
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int ret;
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if (map->current == part)
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return part;
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if (part > read_long((u_int32_t*)&map->partition.MapBlkCnt))
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return -1;
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offset = part * sizeof(struct Partition) + sizeof(struct DriverDescriptor);
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ret = lseek(map->fd, offset, SEEK_SET);
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if (ret != offset)
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return -1;
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ret = read(map->fd, &map->partition, sizeof(struct Partition));
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if (ret != sizeof(struct Partition))
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return -1;
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map->current = part;
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return part;
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}
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