obp/obp/pkg/decompressor/dropin.fth

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\ Hypervisor Software File: dropin.fth
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id: @(#)dropin.fth 1.3 01/04/06
purpose:
copyright: Copyright 1994-2001 Sun Microsystems, Inc.  All Rights Reserved

headerless

fload ${BP}/pkg/decompressor/data.fth
fload ${BP}/pkg/decompressor/sparc/decomp.fth
fload ${BP}/pkg/decompressor/decompress.fth

\ The format of a compressed dropin:
\ Dropin Header
\   4 bytes     magic-number    = COMP
\   4 bytes     size            = dropinhdr->size
\   4 bytes     comp-type
\   4 bytes     decomp-size

: dropin-compressed? ( header -- flag )
  \ Caution here..
  [ 0 to di-header ]
  dup [ di-size ] literal + l@          ( header size )
  swap [  di-image ] literal +          ( size data-ptr )
  dup l@ h# 434f4d50 =                  ( size data-ptr comp? )
  swap 4 + l@                           ( size comp? size )
  rot = and                             ( flag )
;

\
\ These two are the compressed dropin support entry points.
\
overload: (dropin>data) ( -- data,len )
   di-image di-size l@
   di-header dropin-compressed? if      ( data len )
      [ also decompressor ]
      2dup do-decompress if             ( data len data' len' )
         [ 0 to di-header ]             ( data len data' len' )
         2swap 2drop                    ( data' len' )
         over /di-header - dup          ( data' len' di-hdr di-hdr )
         di-header swap /di-header move ( data' len' di-hdr )
         h# 434f4d50 swap               ( data' len' data di-hdr )
         [ di-exp ] literal + l!        ( data' len' )
      then                              ( data len )
      [ previous ]
   then                                 ( data len )
;

\ When the compressed data is copied into memory we also copy the dropin
\ header, the (dropin>data) routine will have marked the di-exp field
\ with the COMP flag so that this routine knows to release the memory that
\ the decompressed data is living in.
: (release-di-data) ( data len -- )
   [ 0 to di-header ]
   over [ /di-header di-exp - ] literal - l@ h# 434f4d50 = if
      [ also decompressor ]
      finish-decompress
      [ previous ]
   else
      2drop
   then
;

' (dropin>data)         is dropin>data
' (release-di-data)     is release-di-data