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  • Committer: Phil Dennis-Jordan
  • Date: 2017-07-21 08:03:43 UTC
  • mfrom: (1.1.1)
  • Revision ID: phil@philjordan.eu-20170721080343-2yr2vdj7713czahv
New upstream release 2.9.0.

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roms/openbios/fs/iso9660/iso9660_readdir.c
 
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/*
 
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 *
 
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 * (c) 2005-2009 Laurent Vivier <Laurent@vivier.eu>
 
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 *
 
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 * This file has been copied from EMILE, http://emile.sf.net
 
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 *
 
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 */
 
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#include "libiso9660.h"
 
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#include "libopenbios/bindings.h"
 
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#include "libc/diskio.h"
 
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#define offsetof(t,m)   ((long)&(((t *)0)->m))
 
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static void read_extent(iso9660_DIR *dir)
 
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{
 
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        seek_io(dir->volume->fd, dir->extent * ISOFS_BLOCK_SIZE);
 
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        read_io(dir->volume->fd, dir->buffer, ISOFS_BLOCK_SIZE);
 
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        dir->len -= ISOFS_BLOCK_SIZE;
 
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        dir->extent ++;
 
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        dir->index = 0;
 
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}
 
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struct iso_directory_record *iso9660_readdir(iso9660_DIR *dir)
 
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{
 
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        struct iso_directory_record *idr;
 
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        if (dir->index >
 
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            ISOFS_BLOCK_SIZE - offsetof(struct iso_directory_record, name[0]))
 
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        {
 
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                if (dir->len <= 0)
 
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                        return NULL;
 
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                read_extent(dir);
 
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        }
 
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        idr = (struct iso_directory_record *) &dir->buffer[dir->index];
 
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        if (idr->length[0] == 0)  {
 
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                if (dir->len <= 0)
 
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                        return NULL;
 
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                read_extent(dir);
 
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                idr = (struct iso_directory_record *) &dir->buffer[dir->index];
 
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        }
 
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        dir->index += dir->buffer[dir->index];
 
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        return idr;
 
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}