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extern size_t unpack_filename(char * to,const char *from);
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extern char * intern_filename(char * to,const char *from);
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extern int pack_filename(char * to, const char *name, size_t max_length);
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extern int init_record_cache(RECORD_CACHE *info,size_t cachesize,int file,
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size_t reclength,enum cache_type type,