lseek() needs to be added to the end to ensure ABI compatibility.

libisofs/fs_image.c

@@ -825,11 +825,11 @@ IsoFileSourceIface ifs_class = {
     ifs_open,
     ifs_close,
     ifs_read,
-    ifs_lseek,
     ifs_readdir,
     ifs_readlink,
     ifs_get_filesystem,
-    ifs_free
+    ifs_free,
+    ifs_lseek
 };
 
 /**

libisofs/fs_local.c

@@ -476,11 +476,11 @@ IsoFileSourceIface lfs_class = {
     lfs_open,
     lfs_close,
     lfs_read,
-    lfs_lseek,
     lfs_readdir,
     lfs_readlink,
     lfs_get_filesystem,
-    lfs_free
+    lfs_free,
+    lfs_lseek
 };
 
 /**

libisofs/libisofs.h

@@ -560,25 +560,6 @@ struct IsoFileSource_Iface
      */
     int (*read)(IsoFileSource *src, void *buf, size_t count);
 
-    /**
-     * Repositions the offset of the IsoFileSource (must be opened) to the 
-     * given offset according to the value of flag.
-     * 
-     * @param offset
-     *      in bytes 
-     * @param flag
-     *      0 The offset is set to offset bytes (SEEK_SET)
-     *      1 The offset is set to its current location plus offset bytes 
-     *        (SEEK_CUR)
-     *      2 The offset is set to the size of the file plus offset bytes 
-     *        (SEEK_END).
-     * @return
-     *      Absolute offset posistion on the file, or < 0 on error. Cast the
-     *      returning value to int to get a valid libisofs error.
-     * @since 0.6.4
-     */
-    off_t (*lseek)(IsoFileSource *src, off_t offset, int flag);
-
     /**
      * Read a directory. 
      * 
@@ -642,6 +623,26 @@ struct IsoFileSource_Iface
      */
     void (*free)(IsoFileSource *src);
     
+    /**
+     * Repositions the offset of the IsoFileSource (must be opened) to the 
+     * given offset according to the value of flag.
+     * 
+     * @param offset
+     *      in bytes 
+     * @param flag
+     *      0 The offset is set to offset bytes (SEEK_SET)
+     *      1 The offset is set to its current location plus offset bytes 
+     *        (SEEK_CUR)
+     *      2 The offset is set to the size of the file plus offset bytes 
+     *        (SEEK_END).
+     * @return
+     *      Absolute offset posistion on the file, or < 0 on error. Cast the
+     *      returning value to int to get a valid libisofs error.
+     * 
+     * @since 0.6.4
+     */
+    off_t (*lseek)(IsoFileSource *src, off_t offset, int flag);
+
     /*
      * TODO #00004 Add a get_mime_type() function.
      * This can be useful for GUI apps, to choose the icon of the file