xnu-517.12.7.tar.gz

[apple/xnu.git] / bsd / isofs / cd9660 / cd9660_bmap.c

diff --git a/bsd/isofs/cd9660/cd9660_bmap.c b/bsd/isofs/cd9660/cd9660_bmap.c
index f031630e2828194d995fcfebd74821135a9f04c1..f01787f5fd72056f880c38fc658977b6315cdbaf 100644 (file)
--- a/bsd/isofs/cd9660/cd9660_bmap.c
+++ b/bsd/isofs/cd9660/cd9660_bmap.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2003 Apple Computer, Inc. All rights reserved.
  *
  * @APPLE_LICENSE_HEADER_START@
  * 
@@ -99,6 +99,17 @@ cd9660_bmap(ap)
        if (ap->a_bnp == NULL)
                return (0);
 
+       /*
+        * Associated files have an Apple Double header
+        */
+       if ((ip->i_flag & ISO_ASSOCIATED) && (lblkno > (ADH_BLKS - 1))) {
+               lblkno -= ADH_BLKS;
+               *ap->a_bnp = (ip->iso_start + lblkno);
+               if (ap->a_runp)
+                       *ap->a_runp = 0;
+               return (0);
+       }
+
        /*
         * Compute the requested block number
         */
@@ -134,7 +145,7 @@ cd9660_blktooff(ap)
        } */ *ap;
 {
        register struct iso_node *ip;
-    register struct iso_mnt *imp;
+       register struct iso_mnt *imp;
 
        if (ap->a_vp == NULL)
                return (EINVAL);
@@ -182,6 +193,7 @@ struct vop_cmap_args /* {
        struct iso_node *ip = VTOI(ap->a_vp);
        size_t cbytes;
        int devBlockSize = 0;
+       off_t offset = ap->a_foffset;
 
        /*
         * Check for underlying vnode requests and ensure that logical
@@ -192,15 +204,29 @@ struct vop_cmap_args /* {
 
        VOP_DEVBLOCKSIZE(ip->i_devvp, &devBlockSize);
 
-       *ap->a_bpn = (daddr_t)(ip->iso_start + lblkno(ip->i_mnt, ap->a_foffset));
+       /*
+        * Associated files have an Apple Double header
+        */
+       if (ip->i_flag & ISO_ASSOCIATED) {
+               if (offset < ADH_SIZE) {
+                       if (ap->a_run)
+                               *ap->a_run = 0;
+                       *ap->a_bpn = -1;
+                       goto out;
+               } else {
+                       offset -= ADH_SIZE;
+               }
+       }
+
+       *ap->a_bpn = (daddr_t)(ip->iso_start + lblkno(ip->i_mnt, offset));
 
        /*
         * Determine maximum number of contiguous bytes following the
         * requested offset.
         */
        if (ap->a_run) {
-               if (ip->i_size > ap->a_foffset)
-                       cbytes = ip->i_size - ap->a_foffset;
+               if (ip->i_size > offset)
+                       cbytes = ip->i_size - offset;
                else
                        cbytes = 0;
 
@@ -208,9 +234,9 @@ struct vop_cmap_args /* {
 
                *ap->a_run = MIN(cbytes, ap->a_size);
        };
-
+out:
        if (ap->a_poff)
-               *(int *)ap->a_poff = (long)ap->a_foffset & (devBlockSize - 1);
+               *(int *)ap->a_poff = (long)offset & (devBlockSize - 1);
 
        return (0);     
 }