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53 lines
1.4 KiB
53 lines
1.4 KiB
3 months ago
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/*
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* UCW Library -- Mapping of File Parts
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*
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* (c) 2003--2006 Martin Mares <mj@ucw.cz>
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* (c) 2003--2005 Robert Spalek <robert@ucw.cz>
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*
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* This software may be freely distributed and used according to the terms
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* of the GNU Lesser General Public License.
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*/
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#ifndef _UCW_PARTMAP_H
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#define _UCW_PARTMAP_H
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#ifdef CONFIG_UCW_CLEAN_ABI
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#define partmap_close ucw_partmap_close
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#define partmap_load ucw_partmap_load
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#define partmap_open ucw_partmap_open
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#define partmap_size ucw_partmap_size
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#endif
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struct partmap {
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int fd;
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ucw_off_t file_size;
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ucw_off_t start_off, end_off;
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byte *start_map;
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int writeable;
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};
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struct partmap *partmap_open(char *name, int writeable);
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void partmap_close(struct partmap *p);
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ucw_off_t partmap_size(struct partmap *p);
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void partmap_load(struct partmap *p, ucw_off_t start, uint size);
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static inline void *partmap_map(struct partmap *p, ucw_off_t start, uint size UNUSED)
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{
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#ifndef CONFIG_UCW_PARTMAP_IS_MMAP
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if (unlikely(!p->start_map || start < p->start_off || (ucw_off_t) (start+size) > p->end_off))
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partmap_load(p, start, size);
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#endif
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return p->start_map + (start - p->start_off);
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}
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static inline void *partmap_map_forward(struct partmap *p, ucw_off_t start, uint size UNUSED)
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{
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#ifndef CONFIG_UCW_PARTMAP_IS_MMAP
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if (unlikely((ucw_off_t) (start+size) > p->end_off))
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partmap_load(p, start, size);
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#endif
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return p->start_map + (start - p->start_off);
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}
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#endif
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