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51 lines
1021 B
C
51 lines
1021 B
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 "openbios/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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}
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