obp/obp/pkg/decompressor/data.fth

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\ Hypervisor Software File: data.fth
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id: @(#)data.fth 1.2 01/04/06
purpose:
copyright: Copyright 1997-2001 Sun Microsystems, Inc.  All Rights Reserved

headers
transient

inline-struct? on

\
\ Watch out space saving trickery here..
\ constants use a lot of space; if they are only used once or twice
\ it is more efficient to use literals, however that obfuscates code
\ so instead I pull an immediate+literal trick
\
d#    14 dup constant dc-#bits
1 swap <<    constant maxmaxbits                \ should NEVER generate this
d#     9     constant #init-bits                \ initial number of bits/code
d# 18013     constant hsize                     \ 91% occupancy
d#  8000     constant /destack

struct
    /l field >getcode-offset
    /l field >getcode-oldcode
    /l field >n-bits            \ current #bits we are compressing with
    /l field >maxcode           \ current maximum code value
    /l field >fin-char
    /l field >incode
    /l field >free-ent          \ current free code value
    /l field >tab-suffix        \ ptr to a buffer.
    /l field >tab-prefix        \ ptr to another buffer
    /l field >de-stack          \ and yet another buffer
    /l field >source-size       \ source buffer size
    /l field >source-addr       \ source address ptr
    /l field >dest-addr         \ destination address ptr
constant /decomp-control

struct
   /decomp-control h# 80 round-up       field >decomp-control
   hsize    h# 100 round-up             field >tab-suffix-offset
   hsize 2* h# 400 round-up             field >tab-prefix-offset
   /destack h# 400 round-up             field >destack-offset
constant /decomp-data

inline-struct? off

resident