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