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Annotation of qemu/roms/openbios/fs/iso9660/iso9660_readdir.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  *
                      3:  * (c) 2005-2009 Laurent Vivier <[email protected]>
                      4:  *
                      5:  * This file has been copied from EMILE, http://emile.sf.net
                      6:  *
                      7:  */
                      8: 
                      9: #include "libiso9660.h"
                     10: #include "libopenbios/bindings.h"
                     11: #include "libc/diskio.h"
                     12: 
                     13: #define offsetof(t,m)  ((long)&(((t *)0)->m))
                     14: 
                     15: static void read_extent(iso9660_DIR *dir)
                     16: {
                     17:        seek_io(dir->volume->fd, dir->extent * ISOFS_BLOCK_SIZE);
                     18:        read_io(dir->volume->fd, dir->buffer, ISOFS_BLOCK_SIZE);
                     19: 
                     20:        dir->len -= ISOFS_BLOCK_SIZE;
                     21:        dir->extent ++;
                     22:        dir->index = 0;
                     23: }
                     24: 
                     25: struct iso_directory_record *iso9660_readdir(iso9660_DIR *dir)
                     26: {
                     27:        struct iso_directory_record *idr;
                     28: 
                     29:        if (dir->index >
                     30:            ISOFS_BLOCK_SIZE - offsetof(struct iso_directory_record, name[0]))
                     31:        {
                     32:                if (dir->len <= 0)
                     33:                        return NULL;
                     34: 
                     35:                read_extent(dir);
                     36:        }
                     37: 
                     38:        idr = (struct iso_directory_record *) &dir->buffer[dir->index];
                     39:        if (idr->length[0] == 0)  {
                     40:                if (dir->len <= 0)
                     41:                        return NULL;
                     42: 
                     43:                read_extent(dir);
                     44:                idr = (struct iso_directory_record *) &dir->buffer[dir->index];
                     45:        }
                     46: 
                     47:        dir->index += dir->buffer[dir->index];
                     48: 
                     49:        return idr;
                     50: }

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