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+\ tag: deblocker support package
+\ 
+\ Copyright (C) 2003 Stefan Reinauer
+\ 
+\ See the file "COPYING" for further information about
+\ the copyright and warranty status of this work.
+\ 
+
+" /packages" find-device
+
+\ The deblocker package makes it easy to implement byte-oriented device
+\ methods, using the block-oriented or record-oriented methods defined by 
+\ devices such as disks or tapes. It provides a layer of buffering between 
+\ the high-level byte-oriented interface and the low-level block-oriented
+\ interface. deblocker uses the max-transfer, block-size, read-blocks and
+\ write-blocks methods of its parent.
+
+new-device
+  " deblocker" device-name
+  \ open ( -- flag )
+  \ Prepares the package for subsequent use, allocating the buffers used 
+  \ by the deblocking process based upon the values returned by the parent 
+  \ instance's max-transfer and block-size methods. Returns -1 if the
+  \ operation succeeds, 0 otherwise.
+  : open ( -- flag )
+
+    ;
+
+  \ close ( -- )
+  \ Frees all resources that were allocated by open.
+  : close ( -- )
+    ;
+
+  \ read ( adr len -- actual )
+  \ Reads at most len bytes from the device into the memory buffer 
+  \ beginning at adr.  Returns actual, the number of bytes actually
+  \ read, or 0 if the read operation failed. Uses the parent's read-
+  \ blocks method as necessary to satisfy the request, buffering any
+  \ unused bytes for the next request.
+  
+  : read ( adr len -- actual )
+    ;
+
+  \ Writes at most len bytes from the device into the memory buffer 
+  \ beginning at adr.  Returns actual, the number of bytes actually 
+  \ read, or 0 if the write operation failed. Uses the parent's write-
+  \ blocks method as necessary to satisfy the request, buffering any 
+  \ unused bytes for the next request.
+			                                  
+  : write ( adr len -- actual )
+    ;
+
+  \ Sets the device position at which the next read or write will take 
+  \ place. The position is specified by the 64-bit number x.position. 
+  \ Returns 0 if the operation succeeds or -1 if it fails.
+
+  : seek ( x.position -- flag )
+    ;
+
+finish-device
+
+\ clean up afterwards
+device-end