compression_test: finally got exomizer working
This commit is contained in:
Vince Weaver
parent
94bc946a4c
commit
bff16e6de7
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@ -1,5 +1,14 @@
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; this one is from passport
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; This source code is altered and is not the original version found on
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; the Exomizer homepage.
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; It contains modifications made by qkumba to depack a packed file
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; optionally crunched forward, and additional modifications by 4am
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; for an optional progress UI.
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;
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; Copyright (c) 2002 - 2020 Magnus Lind.
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; Original copyright statement follows:
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;
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; Copyright (c) 2002 - 2018 Magnus Lind.
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;
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; This software is provided 'as-is', without any express or implied warranty.
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; In no event will the authors be held liable for any damages arising from
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@ -23,64 +32,6 @@
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; used to endorse or promote products derived from this software without
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; specific prior written permission.
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;
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; -------------------------------------------------------------------
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; Known quirks:
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; Can't handle a sequence reference that ends at $ffff. It is left in
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; since it is a corner case and fixing it impacts negatively on
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; performance or backwards compatibility.
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; A simple way to work around this is to not decrunch to address $ffff.
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; -------------------------------------------------------------------
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; Controls if the shared get_bits routines should be inlined or not.
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;INLINE_GET_BITS=1
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.IFNDEF INLINE_GET_BITS
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INLINE_GET_BITS = 0
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.ENDIF
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; -------------------------------------------------------------------
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; if literal sequences is not used (the data was crunched with the -c
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; flag) then the following line can be uncommented for shorter and.
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; slightly faster code.
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;LITERAL_SEQUENCES_NOT_USED = 1
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.IFNDEF LITERAL_SEQUENCES_NOT_USED
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LITERAL_SEQUENCES_NOT_USED = 0
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.ENDIF
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; -------------------------------------------------------------------
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; if the sequence length is limited to 256 (the data was crunched with
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; the -M256 flag) then the following line can be uncommented for
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; shorter and slightly faster code.
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;MAX_SEQUENCE_LENGTH_256 = 1
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.IFNDEF MAX_SEQUENCE_LENGTH_256
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MAX_SEQUENCE_LENGTH_256 = 0
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.ENDIF
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; -------------------------------------------------------------------
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; if the sequence length 3 has its own offset table (the data was
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; crunched with the -P+16 flag) then the following
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; line must be uncommented.
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;EXTRA_TABLE_ENTRY_FOR_LENGTH_THREE = 1
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.IFNDEF EXTRA_TABLE_ENTRY_FOR_LENGTH_THREE
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EXTRA_TABLE_ENTRY_FOR_LENGTH_THREE = 0
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.ENDIF
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; -------------------------------------------------------------------
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; if sequence offsets are not reused (the data was crunched with the
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; -P-32 flag) then the following line must be uncommented. Uncommenting the
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; line will also result in shorter and slightly faster code.
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;DONT_REUSE_OFFSET = 1
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.IFNDEF DONT_REUSE_OFFSET
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DONT_REUSE_OFFSET = 0
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.ENDIF
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; -------------------------------------------------------------------
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; if decrunching forwards then the following line must be uncommented.
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;DECRUNCH_FORWARDS = 1
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.IFNDEF DECRUNCH_FORWARDS
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DECRUNCH_FORWARDS = 0
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.ENDIF
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; -------------------------------------------------------------------
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; if split encoding is used (the data is crunched with the -E flag)
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; then the following line must be uncommented.
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;ENABLE_SPLIT_ENCODING = 1
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.IFNDEF ENABLE_SPLIT_ENCODING
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ENABLE_SPLIT_ENCODING = 0
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.ENDIF
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; -------------------------------------------------------------------
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; The decruncher jsr:s to the get_crunched_byte address when it wants to
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; read a crunched byte into A. This subroutine has to preserve X and Y
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@ -88,65 +39,73 @@ ENABLE_SPLIT_ENCODING = 0
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; -------------------------------------------------------------------
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;.import get_crunched_byte
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; -------------------------------------------------------------------
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; This function is the heart of the decruncher. (for non split crunched files)
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; this function is the heart of the decruncher.
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; It initializes the decruncher zeropage locations and precalculates the
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; decrunch tables and decrunches the data
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; This function will not change the interrupt status bit and it will not
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; modify the memory configuration.
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; -------------------------------------------------------------------
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.export decrunch
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.IF ENABLE_SPLIT_ENCODING <> 0
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;.export decrunch
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; -------------------------------------------------------------------
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; To decrunch files crunched with the split feature (-E) you can't use the
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; decrunch function. Instead you call the split_decrunch function. But you
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; can only do this if the decrunch table contains the encoding used by the
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; file you are decrunching. To generate the correct content for the decrunch
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; table call set the get_crunched_byte function to point to the encoding data
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; and then call the split_gentable function.
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; Controls if the shared get_bits routines should be inlined or not.
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;INLINE_GET_BITS=1
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; -------------------------------------------------------------------
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.export split_gentable
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.export split_decrunch
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.ENDIF
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; if literal sequences is not used (the data was crunched with the -c
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; flag) then the following line can be uncommented for shorter and.
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; slightly faster code.
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;LITERAL_SEQUENCES_NOT_USED = 1
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; -------------------------------------------------------------------
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; if the sequence length is limited to 256 (the data was crunched with
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; the -M256 flag) then the following line can be uncommented for
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; shorter and slightly faster code.
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;MAX_SEQUENCE_LENGTH_256 = 1
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; -------------------------------------------------------------------
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; if the sequence length 3 has its own offset table then the following
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; line can be uncommented for in some situations slightly better
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; compression at the cost of a larger decrunch table.
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EXTRA_TABLE_ENTRY_FOR_LENGTH_THREE = 1
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; -------------------------------------------------------------------
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; optional progress UI
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.ifndef SHOW_PROGRESS_DURING_DECRUNCH
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SHOW_PROGRESS_DURING_DECRUNCH = 0
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.endif
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; -------------------------------------------------------------------
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; zero page addresses used
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; -------------------------------------------------------------------
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zp_len_lo = $9e
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zp_len_hi = $9f
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zp_len_lo = $a7
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zp_len_hi = $a8
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zp_src_lo = $ae
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zp_src_hi = zp_src_lo + 1
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zp_bits_hi = $a7
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.IF DONT_REUSE_OFFSET = 0
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zp_ro_state = $a8
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.ENDIF
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zp_bits_hi = $fc
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zp_bitbuf = $fd
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zp_dest_lo = zp_bitbuf + 1 ; dest addr lo
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zp_dest_hi = zp_bitbuf + 2 ; dest addr hi
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.IF EXTRA_TABLE_ENTRY_FOR_LENGTH_THREE <> 0
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.ifdef EXTRA_TABLE_ENTRY_FOR_LENGTH_THREE
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encoded_entries = 68
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.ELSE
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.else
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encoded_entries = 52
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.ENDIF
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.endif
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tabl_bi = decrunch_table
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tabl_lo = decrunch_table + encoded_entries
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tabl_hi = decrunch_table + encoded_entries * 2
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;; refill bits is always inlined
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.MACRO mac_refill_bits
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.macro mac_refill_bits
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pha
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jsr get_crunched_byte
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rol
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sta zp_bitbuf
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pla
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.ENDMACRO
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.endmacro
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.MACRO mac_get_bits
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.IF INLINE_GET_BITS <> 0
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.SCOPE
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.ifdef INLINE_GET_BITS
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.macro mac_get_bits
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adc #$80 ; needs c=0, affects v
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asl
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bpl gb_skip
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@ -164,26 +123,11 @@ gb_get_hi:
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sta zp_bits_hi
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jsr get_crunched_byte
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skip:
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.ENDSCOPE
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.ELSE
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.endmacro
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.else
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.macro mac_get_bits
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jsr get_bits
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.ENDIF
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.ENDMACRO
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.MACRO mac_init_zp
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.SCOPE
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; -------------------------------------------------------------------
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; init zeropage and x reg. (8 bytes)
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;
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init_zp:
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jsr get_crunched_byte
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sta zp_bitbuf - 1,x
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dex
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bne init_zp
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.ENDSCOPE
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.ENDMACRO
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.IF INLINE_GET_BITS = 0
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.endmacro
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get_bits:
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adc #$80 ; needs c=0, affects v
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asl
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@ -202,7 +146,7 @@ gb_get_hi:
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sec
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sta zp_bits_hi
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jmp get_crunched_byte
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.ENDIF
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.endif
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; -------------------------------------------------------------------
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; no code below this comment has to be modified in order to generate
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; a working decruncher of this source file.
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@ -214,25 +158,42 @@ gb_get_hi:
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; jsr this label to decrunch, it will in turn init the tables and
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; call the decruncher
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; no constraints on register content, however the
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; decimal flag has to be cleared (it almost always is, otherwise do a cld)
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; decimal flag has to be #0 (it almost always is, otherwise do a cld)
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decrunch:
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.IF ENABLE_SPLIT_ENCODING <> 0
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ldx #3
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jsr internal_gentable
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jmp normal_decrunch
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split_gentable:
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ldx #1
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internal_gentable:
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jsr split_init_zp
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.ELSE
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ldx #3
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mac_init_zp
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.ENDIF
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.if SHOW_PROGRESS_DURING_DECRUNCH = 1
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lda $FBB3
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cmp #$EA
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bne +
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lda #$A1 ; use ! instead of | for initial spinner animation
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sta progress_char+1
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sta progress_char+5
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+
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; -------------------------------------------------------------------
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; calculate tables (64 bytes) + get_bits macro
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; x must be #0 when entering
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; show initial on-screen progress UI
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;
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ldy #7
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init_progress_loop:
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lda progress_char,y
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jsr show_one_progress_char
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dey
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bpl init_progress_loop
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done_init_progress_loop:
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.endif
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; -------------------------------------------------------------------
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; init zeropage, x and y regs. (12 bytes)
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;
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ldy #0
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ldx #3
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init_zp:
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jsr get_crunched_byte
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sta zp_bitbuf - 1,x
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dex
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bne init_zp
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; -------------------------------------------------------------------
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; calculate tables (62 bytes) + get_bits macro
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; x and y must be #0 when entering
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;
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clc
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table_gen:
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tax
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@ -271,7 +232,7 @@ rolled:
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bmi no_fixup_lohi
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lda zp_len_hi
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stx zp_len_hi
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.BYTE $24
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.byte $24
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no_fixup_lohi:
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txa
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; -------------------------------------------------------------------
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@ -279,57 +240,60 @@ no_fixup_lohi:
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cpy #encoded_entries
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bne table_gen
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; -------------------------------------------------------------------
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.IF ENABLE_SPLIT_ENCODING <> 0
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rts
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split_decrunch:
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ldx #3
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jsr split_init_zp
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; X reg must be 0 here
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sec
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normal_decrunch:
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.ENDIF
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; -------------------------------------------------------------------
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; prepare for main decruncher
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.IF DONT_REUSE_OFFSET = 0
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ror zp_ro_state
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sec
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.ENDIF
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ldy zp_dest_lo
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stx zp_dest_lo
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stx zp_bits_hi
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; -------------------------------------------------------------------
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; copy one literal byte to destination (11 bytes)
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; copy one literal byte to destination (11(10) bytes)
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;
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.ifndef FORWARD_DECRUNCHING
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FORWARD_DECRUNCHING = 1
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.endif
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.if FORWARD_DECRUNCHING = 0
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literal_start1:
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.IF DECRUNCH_FORWARDS = 0
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tya
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bne no_hi_decr
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dec zp_dest_hi
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.IF DONT_REUSE_OFFSET = 0
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dec zp_src_hi
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.ENDIF
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no_hi_decr:
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dey
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.ENDIF
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jsr get_crunched_byte
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sta (zp_dest_lo),y
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.IF DECRUNCH_FORWARDS <> 0
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.if SHOW_PROGRESS_DURING_DECRUNCH = 1
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; periodically update on-screen progress UI
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dec progress_counter
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bne dont_update_progress_ui
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tya
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pha
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ldy progress_index
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lda progress_char,y
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jsr show_one_progress_char
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inc progress_index
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lda progress_index
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and #$07
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sta progress_index
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tay
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lda #$20
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jsr show_one_progress_char
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pla
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tay
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dont_update_progress_ui:
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.endif
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.else
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literal_start1:
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jsr get_crunched_byte
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sta (zp_dest_lo),y
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iny
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bne skip_hi_incr
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bne no_hi_incr
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inc zp_dest_hi
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.IF DONT_REUSE_OFFSET = 0
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inc zp_src_hi
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.ENDIF
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skip_hi_incr:
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.ENDIF
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no_hi_incr:
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.endif
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; -------------------------------------------------------------------
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; fetch sequence length index (15 bytes)
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; x must be #0 when entering and contains the length index + 1
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; when exiting or 0 for literal byte
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next_round:
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.IF DONT_REUSE_OFFSET = 0
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ror zp_ro_state
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.ENDIF
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dex
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lda zp_bitbuf
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no_literal1:
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@ -349,13 +313,13 @@ nofetch8:
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; check for decrunch done and literal sequences (4 bytes)
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;
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cpx #$11
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.IF INLINE_GET_BITS <> 0
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.ifdef INLINE_GET_BITS
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bcc skip_jmp
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jmp exit_or_lit_seq
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skip_jmp:
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.ELSE
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.else
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bcs exit_or_lit_seq
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.ENDIF
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.endif
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; -------------------------------------------------------------------
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; calulate length of sequence (zp_len) (18(11) bytes) + get_bits macro
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;
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@ -363,7 +327,7 @@ skip_jmp:
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mac_get_bits
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adc tabl_lo - 1,x ; we have now calculated zp_len_lo
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sta zp_len_lo
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.IF MAX_SEQUENCE_LENGTH_256 = 0
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.ifndef MAX_SEQUENCE_LENGTH_256
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lda zp_bits_hi
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adc tabl_hi - 1,x ; c = 0 after this.
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sta zp_len_hi
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@ -372,32 +336,15 @@ skip_jmp:
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; z-flag reflects zp_len_hi here
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;
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ldx zp_len_lo
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.ELSE
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.else
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tax
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.ENDIF
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.IF MAX_SEQUENCE_LENGTH_256 = 0
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lda #0
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.ENDIF
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.IF DONT_REUSE_OFFSET = 0
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; -------------------------------------------------------------------
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; here we decide to reuse latest offset or not (13(15) bytes)
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;
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bit <zp_ro_state
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bmi test_reuse
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no_reuse:
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.ENDIF
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; -------------------------------------------------------------------
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; here we decide what offset table to use (17(15) bytes)
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;
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.IF MAX_SEQUENCE_LENGTH_256 = 0
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sta <zp_bits_hi
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.ENDIF
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.endif
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lda #$e1
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.IF EXTRA_TABLE_ENTRY_FOR_LENGTH_THREE <> 0
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.ifdef EXTRA_TABLE_ENTRY_FOR_LENGTH_THREE
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cpx #$04
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.ELSE
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.else
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cpx #$03
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.ENDIF
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.endif
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bcs gbnc2_next
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lda tabl_bit - 1,x
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gbnc2_next:
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@ -413,139 +360,144 @@ gbnc2_ok:
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bcs gbnc2_next
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tax
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; -------------------------------------------------------------------
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; calulate absolute offset (zp_src) (17 bytes) + get_bits macro
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; calulate absolute offset (zp_src) (21(23) bytes) + get_bits macro
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;
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.ifndef MAX_SEQUENCE_LENGTH_256
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lda #0
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sta zp_bits_hi
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.endif
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lda tabl_bi,x
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mac_get_bits
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.IF DECRUNCH_FORWARDS = 0
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.if FORWARD_DECRUNCHING = 0
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adc tabl_lo,x
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sta zp_src_lo
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lda zp_bits_hi
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adc tabl_hi,x
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adc zp_dest_hi
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sta zp_src_hi
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.ELSE
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.else
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clc
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adc tabl_lo,x
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eor #$ff
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sta zp_src_lo
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lda zp_bits_hi
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adc tabl_hi,x
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eor #$ff
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adc zp_dest_hi
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sta zp_src_hi
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lda zp_dest_hi
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bcc skip_dest_hi
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sbc #1
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clc
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.ENDIF
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skip_dest_hi:
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sbc zp_bits_hi
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sbc tabl_hi,x
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clc
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.endif
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sta zp_src_hi
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; -------------------------------------------------------------------
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; prepare for copy loop (2 bytes)
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;
|
||||
pre_copy:
|
||||
ldx zp_len_lo
|
||||
; -------------------------------------------------------------------
|
||||
; main copy loop (30 bytes)
|
||||
;
|
||||
copy_next:
|
||||
.IF DECRUNCH_FORWARDS = 0
|
||||
.if FORWARD_DECRUNCHING = 0
|
||||
tya
|
||||
bne copy_skip_hi
|
||||
dec zp_dest_hi
|
||||
dec zp_src_hi
|
||||
copy_skip_hi:
|
||||
dey
|
||||
.ENDIF
|
||||
.IF LITERAL_SEQUENCES_NOT_USED = 0
|
||||
.endif
|
||||
.ifndef LITERAL_SEQUENCES_NOT_USED
|
||||
bcs get_literal_byte
|
||||
.ENDIF
|
||||
.endif
|
||||
lda (zp_src_lo),y
|
||||
literal_byte_gotten:
|
||||
sta (zp_dest_lo),y
|
||||
.IF DECRUNCH_FORWARDS <> 0
|
||||
.if (FORWARD_DECRUNCHING = 1)
|
||||
iny
|
||||
bne copy_skip_hi
|
||||
inc zp_dest_hi
|
||||
inc zp_src_hi
|
||||
copy_skip_hi:
|
||||
.ENDIF
|
||||
.endif
|
||||
dex
|
||||
bne copy_next
|
||||
.IF MAX_SEQUENCE_LENGTH_256 = 0
|
||||
.ifndef MAX_SEQUENCE_LENGTH_256
|
||||
lda zp_len_hi
|
||||
.IF INLINE_GET_BITS <> 0
|
||||
.ifdef INLINE_GET_BITS
|
||||
bne copy_next_hi
|
||||
.ENDIF
|
||||
.ENDIF
|
||||
.endif
|
||||
.endif
|
||||
begin_stx:
|
||||
stx zp_bits_hi
|
||||
.IF INLINE_GET_BITS = 0
|
||||
.ifndef INLINE_GET_BITS
|
||||
beq next_round
|
||||
.ELSE
|
||||
.else
|
||||
jmp next_round
|
||||
.ENDIF
|
||||
.IF MAX_SEQUENCE_LENGTH_256 = 0
|
||||
.endif
|
||||
.ifndef MAX_SEQUENCE_LENGTH_256
|
||||
copy_next_hi:
|
||||
dec zp_len_hi
|
||||
jmp copy_next
|
||||
.ENDIF
|
||||
.IF DONT_REUSE_OFFSET = 0
|
||||
; -------------------------------------------------------------------
|
||||
; test for offset reuse (11 bytes)
|
||||
;
|
||||
test_reuse:
|
||||
bvs no_reuse
|
||||
.IF MAX_SEQUENCE_LENGTH_256 <> 0
|
||||
lda #$00 ; fetch one bit
|
||||
.ENDIF
|
||||
asl zp_bitbuf
|
||||
bne gbnc1_ok
|
||||
pha
|
||||
.endif
|
||||
.ifndef LITERAL_SEQUENCES_NOT_USED
|
||||
get_literal_byte:
|
||||
jsr get_crunched_byte
|
||||
rol
|
||||
sta zp_bitbuf
|
||||
pla
|
||||
gbnc1_ok:
|
||||
rol
|
||||
beq no_reuse ; bit == 0 => C=0, no reuse
|
||||
bne copy_next ; bit != 0 => C=0, reuse previous offset
|
||||
.ENDIF
|
||||
bcs literal_byte_gotten
|
||||
.endif
|
||||
; -------------------------------------------------------------------
|
||||
; exit or literal sequence handling (16(12) bytes)
|
||||
;
|
||||
exit_or_lit_seq:
|
||||
.IF LITERAL_SEQUENCES_NOT_USED = 0
|
||||
.ifndef LITERAL_SEQUENCES_NOT_USED
|
||||
beq decr_exit
|
||||
jsr get_crunched_byte
|
||||
.IF MAX_SEQUENCE_LENGTH_256 = 0
|
||||
.ifndef MAX_SEQUENCE_LENGTH_256
|
||||
sta zp_len_hi
|
||||
.ENDIF
|
||||
.endif
|
||||
jsr get_crunched_byte
|
||||
tax
|
||||
bcs copy_next
|
||||
decr_exit:
|
||||
.ENDIF
|
||||
.endif
|
||||
rts
|
||||
.IF LITERAL_SEQUENCES_NOT_USED = 0
|
||||
get_literal_byte:
|
||||
jsr get_crunched_byte
|
||||
bcs literal_byte_gotten
|
||||
.ENDIF
|
||||
.IF EXTRA_TABLE_ENTRY_FOR_LENGTH_THREE <> 0
|
||||
.ifdef EXTRA_TABLE_ENTRY_FOR_LENGTH_THREE
|
||||
; -------------------------------------------------------------------
|
||||
; the static stable used for bits+offset for lengths 1, 2 and 3 (3 bytes)
|
||||
; bits 2, 4, 4 and offsets 64, 48, 32 corresponding to
|
||||
; %10010000, %11100011, %11100010
|
||||
tabl_bit:
|
||||
.BYTE $90, $e3, $e2
|
||||
.ELSE
|
||||
.byte $90, $e3, $e2
|
||||
.else
|
||||
; -------------------------------------------------------------------
|
||||
; the static stable used for bits+offset for lengths 1 and 2 (2 bytes)
|
||||
; bits 2, 4 and offsets 48, 32 corresponding to %10001100, %11100010
|
||||
tabl_bit:
|
||||
.BYTE $8c, $e2
|
||||
.ENDIF
|
||||
|
||||
.IF ENABLE_SPLIT_ENCODING <> 0
|
||||
split_init_zp:
|
||||
mac_init_zp
|
||||
.byte $8c, $e2
|
||||
.endif
|
||||
.if SHOW_PROGRESS_DURING_DECRUNCH = 1
|
||||
progress_index:
|
||||
.byte $00
|
||||
progress_counter:
|
||||
.byte $00
|
||||
progress_char:
|
||||
.byte $DC, $FC, $AF, $AD, $DC, $FC, $AF, $AD
|
||||
progress_address_lo:
|
||||
.byte $BB, $BC, $BD, $3D, $BD, $BC, $BB, $3B
|
||||
progress_address_hi:
|
||||
.byte $05, $05, $05, $06, $06, $06, $06, $06
|
||||
show_one_progress_char:
|
||||
; in: A=ASCII char to show
|
||||
; y=0..7 index into progress_address_lo/hi array
|
||||
pha
|
||||
lda progress_address_lo,y
|
||||
sta progress_STA+1
|
||||
lda progress_address_hi,y
|
||||
sta progress_STA+2
|
||||
pla
|
||||
progress_STA:
|
||||
sta $FFFF
|
||||
rts
|
||||
.ENDIF
|
||||
.endif
|
||||
; -------------------------------------------------------------------
|
||||
; end of decruncher
|
||||
; -------------------------------------------------------------------
|
||||
|
|
@ -554,22 +506,22 @@ split_init_zp:
|
|||
; this 156 (204) byte table area may be relocated. It may also be
|
||||
; clobbered by other data between decrunches.
|
||||
; -------------------------------------------------------------------
|
||||
decrunch_table:
|
||||
.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
||||
.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
||||
.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
||||
.IF EXTRA_TABLE_ENTRY_FOR_LENGTH_THREE <> 0
|
||||
.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
||||
.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
||||
.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
||||
.ENDIF
|
||||
.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
||||
.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
||||
.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
||||
.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
||||
.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
||||
.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
||||
.byte 0,0,0,0,0,0,0,0,0,0,0,0
|
||||
decrunch_table=$200;;:
|
||||
;; .byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
||||
;; .byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
||||
;; .byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
||||
;;.IFDEF EXTRA_TABLE_ENTRY_FOR_LENGTH_THREE
|
||||
;; .byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
||||
;; .byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
||||
;; .byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
||||
;;.ENDIF
|
||||
;; .byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
||||
;; .byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
||||
;; .byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
||||
;; .byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
||||
;; .byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
||||
;; .byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
||||
;; .byte 0,0,0,0,0,0,0,0,0,0,0,0
|
||||
; -------------------------------------------------------------------
|
||||
; end of decruncher
|
||||
; -------------------------------------------------------------------
|
||||
|
|
|
|||
|
|
@ -0,0 +1,575 @@
|
|||
;
|
||||
; Copyright (c) 2002 - 2020 Magnus Lind.
|
||||
;
|
||||
; This software is provided 'as-is', without any express or implied warranty.
|
||||
; In no event will the authors be held liable for any damages arising from
|
||||
; the use of this software.
|
||||
;
|
||||
; Permission is granted to anyone to use this software for any purpose,
|
||||
; including commercial applications, and to alter it and redistribute it
|
||||
; freely, subject to the following restrictions:
|
||||
;
|
||||
; 1. The origin of this software must not be misrepresented; you must not
|
||||
; claim that you wrote the original software. If you use this software in a
|
||||
; product, an acknowledgment in the product documentation would be
|
||||
; appreciated but is not required.
|
||||
;
|
||||
; 2. Altered source versions must be plainly marked as such, and must not
|
||||
; be misrepresented as being the original software.
|
||||
;
|
||||
; 3. This notice may not be removed or altered from any distribution.
|
||||
;
|
||||
; 4. The names of this software and/or it's copyright holders may not be
|
||||
; used to endorse or promote products derived from this software without
|
||||
; specific prior written permission.
|
||||
;
|
||||
; -------------------------------------------------------------------
|
||||
; Known quirks:
|
||||
; Can't handle a sequence reference that ends at $ffff. It is left in
|
||||
; since it is a corner case and fixing it impacts negatively on
|
||||
; performance or backwards compatibility.
|
||||
; A simple way to work around this is to not decrunch to address $ffff.
|
||||
; -------------------------------------------------------------------
|
||||
; Controls if the shared get_bits routines should be inlined or not.
|
||||
;INLINE_GET_BITS=1
|
||||
.IFNDEF INLINE_GET_BITS
|
||||
INLINE_GET_BITS = 0
|
||||
.ENDIF
|
||||
; -------------------------------------------------------------------
|
||||
; if literal sequences is not used (the data was crunched with the -c
|
||||
; flag) then the following line can be uncommented for shorter and.
|
||||
; slightly faster code.
|
||||
;LITERAL_SEQUENCES_NOT_USED = 1
|
||||
.IFNDEF LITERAL_SEQUENCES_NOT_USED
|
||||
LITERAL_SEQUENCES_NOT_USED = 0
|
||||
.ENDIF
|
||||
; -------------------------------------------------------------------
|
||||
; if the sequence length is limited to 256 (the data was crunched with
|
||||
; the -M256 flag) then the following line can be uncommented for
|
||||
; shorter and slightly faster code.
|
||||
;MAX_SEQUENCE_LENGTH_256 = 1
|
||||
.IFNDEF MAX_SEQUENCE_LENGTH_256
|
||||
MAX_SEQUENCE_LENGTH_256 = 0
|
||||
.ENDIF
|
||||
; -------------------------------------------------------------------
|
||||
; if the sequence length 3 has its own offset table (the data was
|
||||
; crunched with the -P+16 flag) then the following
|
||||
; line must be uncommented.
|
||||
;EXTRA_TABLE_ENTRY_FOR_LENGTH_THREE = 1
|
||||
.IFNDEF EXTRA_TABLE_ENTRY_FOR_LENGTH_THREE
|
||||
EXTRA_TABLE_ENTRY_FOR_LENGTH_THREE = 0
|
||||
.ENDIF
|
||||
; -------------------------------------------------------------------
|
||||
; if sequence offsets are not reused (the data was crunched with the
|
||||
; -P-32 flag) then the following line must be uncommented. Uncommenting the
|
||||
; line will also result in shorter and slightly faster code.
|
||||
;DONT_REUSE_OFFSET = 1
|
||||
.IFNDEF DONT_REUSE_OFFSET
|
||||
DONT_REUSE_OFFSET = 0
|
||||
.ENDIF
|
||||
; -------------------------------------------------------------------
|
||||
; if decrunching forwards then the following line must be uncommented.
|
||||
;DECRUNCH_FORWARDS = 1
|
||||
.IFNDEF DECRUNCH_FORWARDS
|
||||
DECRUNCH_FORWARDS = 0
|
||||
.ENDIF
|
||||
; -------------------------------------------------------------------
|
||||
; if split encoding is used (the data is crunched with the -E flag)
|
||||
; then the following line must be uncommented.
|
||||
;ENABLE_SPLIT_ENCODING = 1
|
||||
.IFNDEF ENABLE_SPLIT_ENCODING
|
||||
ENABLE_SPLIT_ENCODING = 0
|
||||
.ENDIF
|
||||
|
||||
; -------------------------------------------------------------------
|
||||
; The decruncher jsr:s to the get_crunched_byte address when it wants to
|
||||
; read a crunched byte into A. This subroutine has to preserve X and Y
|
||||
; register and must not modify the state of the carry nor the overflow flag.
|
||||
; -------------------------------------------------------------------
|
||||
;.import get_crunched_byte
|
||||
; -------------------------------------------------------------------
|
||||
; This function is the heart of the decruncher. (for non split crunched files)
|
||||
; It initializes the decruncher zeropage locations and precalculates the
|
||||
; decrunch tables and decrunches the data
|
||||
; This function will not change the interrupt status bit and it will not
|
||||
; modify the memory configuration.
|
||||
; -------------------------------------------------------------------
|
||||
.export decrunch
|
||||
.IF ENABLE_SPLIT_ENCODING <> 0
|
||||
; -------------------------------------------------------------------
|
||||
; To decrunch files crunched with the split feature (-E) you can't use the
|
||||
; decrunch function. Instead you call the split_decrunch function. But you
|
||||
; can only do this if the decrunch table contains the encoding used by the
|
||||
; file you are decrunching. To generate the correct content for the decrunch
|
||||
; table call set the get_crunched_byte function to point to the encoding data
|
||||
; and then call the split_gentable function.
|
||||
; -------------------------------------------------------------------
|
||||
.export split_gentable
|
||||
.export split_decrunch
|
||||
.ENDIF
|
||||
; -------------------------------------------------------------------
|
||||
; zero page addresses used
|
||||
; -------------------------------------------------------------------
|
||||
zp_len_lo = $9e
|
||||
zp_len_hi = $9f
|
||||
|
||||
zp_src_lo = $ae
|
||||
zp_src_hi = zp_src_lo + 1
|
||||
|
||||
zp_bits_hi = $a7
|
||||
.IF DONT_REUSE_OFFSET = 0
|
||||
zp_ro_state = $a8
|
||||
.ENDIF
|
||||
|
||||
zp_bitbuf = $fd
|
||||
zp_dest_lo = zp_bitbuf + 1 ; dest addr lo
|
||||
zp_dest_hi = zp_bitbuf + 2 ; dest addr hi
|
||||
|
||||
.IF EXTRA_TABLE_ENTRY_FOR_LENGTH_THREE <> 0
|
||||
encoded_entries = 68
|
||||
.ELSE
|
||||
encoded_entries = 52
|
||||
.ENDIF
|
||||
|
||||
tabl_bi = decrunch_table
|
||||
tabl_lo = decrunch_table + encoded_entries
|
||||
tabl_hi = decrunch_table + encoded_entries * 2
|
||||
|
||||
;; refill bits is always inlined
|
||||
.MACRO mac_refill_bits
|
||||
pha
|
||||
jsr get_crunched_byte
|
||||
rol
|
||||
sta zp_bitbuf
|
||||
pla
|
||||
.ENDMACRO
|
||||
|
||||
.MACRO mac_get_bits
|
||||
.IF INLINE_GET_BITS <> 0
|
||||
.SCOPE
|
||||
adc #$80 ; needs c=0, affects v
|
||||
asl
|
||||
bpl gb_skip
|
||||
gb_next:
|
||||
asl zp_bitbuf
|
||||
bne gb_ok
|
||||
mac_refill_bits
|
||||
gb_ok:
|
||||
rol
|
||||
bmi gb_next
|
||||
gb_skip:
|
||||
bvc skip
|
||||
gb_get_hi:
|
||||
sec
|
||||
sta zp_bits_hi
|
||||
jsr get_crunched_byte
|
||||
skip:
|
||||
.ENDSCOPE
|
||||
.ELSE
|
||||
jsr get_bits
|
||||
.ENDIF
|
||||
.ENDMACRO
|
||||
|
||||
.MACRO mac_init_zp
|
||||
.SCOPE
|
||||
; -------------------------------------------------------------------
|
||||
; init zeropage and x reg. (8 bytes)
|
||||
;
|
||||
init_zp:
|
||||
jsr get_crunched_byte
|
||||
sta zp_bitbuf - 1,x
|
||||
dex
|
||||
bne init_zp
|
||||
.ENDSCOPE
|
||||
.ENDMACRO
|
||||
|
||||
.IF INLINE_GET_BITS = 0
|
||||
get_bits:
|
||||
adc #$80 ; needs c=0, affects v
|
||||
asl
|
||||
bpl gb_skip
|
||||
gb_next:
|
||||
asl zp_bitbuf
|
||||
bne gb_ok
|
||||
mac_refill_bits
|
||||
gb_ok:
|
||||
rol
|
||||
bmi gb_next
|
||||
gb_skip:
|
||||
bvs gb_get_hi
|
||||
rts
|
||||
gb_get_hi:
|
||||
sec
|
||||
sta zp_bits_hi
|
||||
jmp get_crunched_byte
|
||||
.ENDIF
|
||||
; -------------------------------------------------------------------
|
||||
; no code below this comment has to be modified in order to generate
|
||||
; a working decruncher of this source file.
|
||||
; However, you may want to relocate the tables last in the file to a
|
||||
; more suitable address.
|
||||
; -------------------------------------------------------------------
|
||||
|
||||
; -------------------------------------------------------------------
|
||||
; jsr this label to decrunch, it will in turn init the tables and
|
||||
; call the decruncher
|
||||
; no constraints on register content, however the
|
||||
; decimal flag has to be cleared (it almost always is, otherwise do a cld)
|
||||
decrunch:
|
||||
.IF ENABLE_SPLIT_ENCODING <> 0
|
||||
ldx #3
|
||||
jsr internal_gentable
|
||||
jmp normal_decrunch
|
||||
split_gentable:
|
||||
ldx #1
|
||||
internal_gentable:
|
||||
jsr split_init_zp
|
||||
.ELSE
|
||||
ldx #3
|
||||
mac_init_zp
|
||||
.ENDIF
|
||||
; -------------------------------------------------------------------
|
||||
; calculate tables (64 bytes) + get_bits macro
|
||||
; x must be #0 when entering
|
||||
;
|
||||
ldy #0
|
||||
clc
|
||||
table_gen:
|
||||
tax
|
||||
tya
|
||||
and #$0f
|
||||
sta tabl_lo,y
|
||||
beq shortcut ; start a new sequence
|
||||
; -------------------------------------------------------------------
|
||||
txa
|
||||
adc tabl_lo - 1,y
|
||||
sta tabl_lo,y
|
||||
lda zp_len_hi
|
||||
adc tabl_hi - 1,y
|
||||
shortcut:
|
||||
sta tabl_hi,y
|
||||
; -------------------------------------------------------------------
|
||||
lda #$01
|
||||
sta <zp_len_hi
|
||||
lda #$78 ; %01111000
|
||||
mac_get_bits
|
||||
; -------------------------------------------------------------------
|
||||
lsr
|
||||
tax
|
||||
beq rolled
|
||||
php
|
||||
rolle:
|
||||
asl zp_len_hi
|
||||
sec
|
||||
ror
|
||||
dex
|
||||
bne rolle
|
||||
plp
|
||||
rolled:
|
||||
ror
|
||||
sta tabl_bi,y
|
||||
bmi no_fixup_lohi
|
||||
lda zp_len_hi
|
||||
stx zp_len_hi
|
||||
.BYTE $24
|
||||
no_fixup_lohi:
|
||||
txa
|
||||
; -------------------------------------------------------------------
|
||||
iny
|
||||
cpy #encoded_entries
|
||||
bne table_gen
|
||||
; -------------------------------------------------------------------
|
||||
.IF ENABLE_SPLIT_ENCODING <> 0
|
||||
rts
|
||||
split_decrunch:
|
||||
ldx #3
|
||||
jsr split_init_zp
|
||||
; X reg must be 0 here
|
||||
sec
|
||||
normal_decrunch:
|
||||
.ENDIF
|
||||
; -------------------------------------------------------------------
|
||||
; prepare for main decruncher
|
||||
.IF DONT_REUSE_OFFSET = 0
|
||||
ror zp_ro_state
|
||||
sec
|
||||
.ENDIF
|
||||
ldy zp_dest_lo
|
||||
stx zp_dest_lo
|
||||
stx zp_bits_hi
|
||||
; -------------------------------------------------------------------
|
||||
; copy one literal byte to destination (11 bytes)
|
||||
;
|
||||
literal_start1:
|
||||
.IF DECRUNCH_FORWARDS = 0
|
||||
tya
|
||||
bne no_hi_decr
|
||||
dec zp_dest_hi
|
||||
.IF DONT_REUSE_OFFSET = 0
|
||||
dec zp_src_hi
|
||||
.ENDIF
|
||||
no_hi_decr:
|
||||
dey
|
||||
.ENDIF
|
||||
jsr get_crunched_byte
|
||||
sta (zp_dest_lo),y
|
||||
.IF DECRUNCH_FORWARDS <> 0
|
||||
iny
|
||||
bne skip_hi_incr
|
||||
inc zp_dest_hi
|
||||
.IF DONT_REUSE_OFFSET = 0
|
||||
inc zp_src_hi
|
||||
.ENDIF
|
||||
skip_hi_incr:
|
||||
.ENDIF
|
||||
; -------------------------------------------------------------------
|
||||
; fetch sequence length index (15 bytes)
|
||||
; x must be #0 when entering and contains the length index + 1
|
||||
; when exiting or 0 for literal byte
|
||||
next_round:
|
||||
.IF DONT_REUSE_OFFSET = 0
|
||||
ror zp_ro_state
|
||||
.ENDIF
|
||||
dex
|
||||
lda zp_bitbuf
|
||||
no_literal1:
|
||||
asl
|
||||
bne nofetch8
|
||||
jsr get_crunched_byte
|
||||
rol
|
||||
nofetch8:
|
||||
inx
|
||||
bcc no_literal1
|
||||
sta zp_bitbuf
|
||||
; -------------------------------------------------------------------
|
||||
; check for literal byte (2 bytes)
|
||||
;
|
||||
beq literal_start1
|
||||
; -------------------------------------------------------------------
|
||||
; check for decrunch done and literal sequences (4 bytes)
|
||||
;
|
||||
cpx #$11
|
||||
.IF INLINE_GET_BITS <> 0
|
||||
bcc skip_jmp
|
||||
jmp exit_or_lit_seq
|
||||
skip_jmp:
|
||||
.ELSE
|
||||
bcs exit_or_lit_seq
|
||||
.ENDIF
|
||||
; -------------------------------------------------------------------
|
||||
; calulate length of sequence (zp_len) (18(11) bytes) + get_bits macro
|
||||
;
|
||||
lda tabl_bi - 1,x
|
||||
mac_get_bits
|
||||
adc tabl_lo - 1,x ; we have now calculated zp_len_lo
|
||||
sta zp_len_lo
|
||||
.IF MAX_SEQUENCE_LENGTH_256 = 0
|
||||
lda zp_bits_hi
|
||||
adc tabl_hi - 1,x ; c = 0 after this.
|
||||
sta zp_len_hi
|
||||
; -------------------------------------------------------------------
|
||||
; here we decide what offset table to use (27(26) bytes) + get_bits_nc macro
|
||||
; z-flag reflects zp_len_hi here
|
||||
;
|
||||
ldx zp_len_lo
|
||||
.ELSE
|
||||
tax
|
||||
.ENDIF
|
||||
.IF MAX_SEQUENCE_LENGTH_256 = 0
|
||||
lda #0
|
||||
.ENDIF
|
||||
.IF DONT_REUSE_OFFSET = 0
|
||||
; -------------------------------------------------------------------
|
||||
; here we decide to reuse latest offset or not (13(15) bytes)
|
||||
;
|
||||
bit <zp_ro_state
|
||||
bmi test_reuse
|
||||
no_reuse:
|
||||
.ENDIF
|
||||
; -------------------------------------------------------------------
|
||||
; here we decide what offset table to use (17(15) bytes)
|
||||
;
|
||||
.IF MAX_SEQUENCE_LENGTH_256 = 0
|
||||
sta <zp_bits_hi
|
||||
.ENDIF
|
||||
lda #$e1
|
||||
.IF EXTRA_TABLE_ENTRY_FOR_LENGTH_THREE <> 0
|
||||
cpx #$04
|
||||
.ELSE
|
||||
cpx #$03
|
||||
.ENDIF
|
||||
bcs gbnc2_next
|
||||
lda tabl_bit - 1,x
|
||||
gbnc2_next:
|
||||
asl zp_bitbuf
|
||||
bne gbnc2_ok
|
||||
tax
|
||||
jsr get_crunched_byte
|
||||
rol
|
||||
sta zp_bitbuf
|
||||
txa
|
||||
gbnc2_ok:
|
||||
rol
|
||||
bcs gbnc2_next
|
||||
tax
|
||||
; -------------------------------------------------------------------
|
||||
; calulate absolute offset (zp_src) (17 bytes) + get_bits macro
|
||||
;
|
||||
lda tabl_bi,x
|
||||
mac_get_bits
|
||||
.IF DECRUNCH_FORWARDS = 0
|
||||
adc tabl_lo,x
|
||||
sta zp_src_lo
|
||||
lda zp_bits_hi
|
||||
adc tabl_hi,x
|
||||
adc zp_dest_hi
|
||||
sta zp_src_hi
|
||||
.ELSE
|
||||
clc
|
||||
adc tabl_lo,x
|
||||
eor #$ff
|
||||
sta zp_src_lo
|
||||
lda zp_bits_hi
|
||||
adc tabl_hi,x
|
||||
eor #$ff
|
||||
adc zp_dest_hi
|
||||
sta zp_src_hi
|
||||
clc
|
||||
.ENDIF
|
||||
; -------------------------------------------------------------------
|
||||
; prepare for copy loop (2 bytes)
|
||||
;
|
||||
ldx zp_len_lo
|
||||
; -------------------------------------------------------------------
|
||||
; main copy loop (30 bytes)
|
||||
;
|
||||
copy_next:
|
||||
.IF DECRUNCH_FORWARDS = 0
|
||||
tya
|
||||
bne copy_skip_hi
|
||||
dec zp_dest_hi
|
||||
dec zp_src_hi
|
||||
copy_skip_hi:
|
||||
dey
|
||||
.ENDIF
|
||||
.IF LITERAL_SEQUENCES_NOT_USED = 0
|
||||
bcs get_literal_byte
|
||||
.ENDIF
|
||||
lda (zp_src_lo),y
|
||||
literal_byte_gotten:
|
||||
sta (zp_dest_lo),y
|
||||
.IF DECRUNCH_FORWARDS <> 0
|
||||
iny
|
||||
bne copy_skip_hi
|
||||
inc zp_dest_hi
|
||||
inc zp_src_hi
|
||||
copy_skip_hi:
|
||||
.ENDIF
|
||||
dex
|
||||
bne copy_next
|
||||
.IF MAX_SEQUENCE_LENGTH_256 = 0
|
||||
lda zp_len_hi
|
||||
.IF INLINE_GET_BITS <> 0
|
||||
bne copy_next_hi
|
||||
.ENDIF
|
||||
.ENDIF
|
||||
stx zp_bits_hi
|
||||
.IF INLINE_GET_BITS = 0
|
||||
beq next_round
|
||||
.ELSE
|
||||
jmp next_round
|
||||
.ENDIF
|
||||
.IF MAX_SEQUENCE_LENGTH_256 = 0
|
||||
copy_next_hi:
|
||||
dec zp_len_hi
|
||||
jmp copy_next
|
||||
.ENDIF
|
||||
.IF DONT_REUSE_OFFSET = 0
|
||||
; -------------------------------------------------------------------
|
||||
; test for offset reuse (11 bytes)
|
||||
;
|
||||
test_reuse:
|
||||
bvs no_reuse
|
||||
.IF MAX_SEQUENCE_LENGTH_256 <> 0
|
||||
lda #$00 ; fetch one bit
|
||||
.ENDIF
|
||||
asl zp_bitbuf
|
||||
bne gbnc1_ok
|
||||
pha
|
||||
jsr get_crunched_byte
|
||||
rol
|
||||
sta zp_bitbuf
|
||||
pla
|
||||
gbnc1_ok:
|
||||
rol
|
||||
beq no_reuse ; bit == 0 => C=0, no reuse
|
||||
bne copy_next ; bit != 0 => C=0, reuse previous offset
|
||||
.ENDIF
|
||||
; -------------------------------------------------------------------
|
||||
; exit or literal sequence handling (16(12) bytes)
|
||||
;
|
||||
exit_or_lit_seq:
|
||||
.IF LITERAL_SEQUENCES_NOT_USED = 0
|
||||
beq decr_exit
|
||||
jsr get_crunched_byte
|
||||
.IF MAX_SEQUENCE_LENGTH_256 = 0
|
||||
sta zp_len_hi
|
||||
.ENDIF
|
||||
jsr get_crunched_byte
|
||||
tax
|
||||
bcs copy_next
|
||||
decr_exit:
|
||||
.ENDIF
|
||||
rts
|
||||
.IF LITERAL_SEQUENCES_NOT_USED = 0
|
||||
get_literal_byte:
|
||||
jsr get_crunched_byte
|
||||
bcs literal_byte_gotten
|
||||
.ENDIF
|
||||
.IF EXTRA_TABLE_ENTRY_FOR_LENGTH_THREE <> 0
|
||||
; -------------------------------------------------------------------
|
||||
; the static stable used for bits+offset for lengths 1, 2 and 3 (3 bytes)
|
||||
; bits 2, 4, 4 and offsets 64, 48, 32 corresponding to
|
||||
; %10010000, %11100011, %11100010
|
||||
tabl_bit:
|
||||
.BYTE $90, $e3, $e2
|
||||
.ELSE
|
||||
; -------------------------------------------------------------------
|
||||
; the static stable used for bits+offset for lengths 1 and 2 (2 bytes)
|
||||
; bits 2, 4 and offsets 48, 32 corresponding to %10001100, %11100010
|
||||
tabl_bit:
|
||||
.BYTE $8c, $e2
|
||||
.ENDIF
|
||||
|
||||
.IF ENABLE_SPLIT_ENCODING <> 0
|
||||
split_init_zp:
|
||||
mac_init_zp
|
||||
rts
|
||||
.ENDIF
|
||||
; -------------------------------------------------------------------
|
||||
; end of decruncher
|
||||
; -------------------------------------------------------------------
|
||||
|
||||
; -------------------------------------------------------------------
|
||||
; this 156 (204) byte table area may be relocated. It may also be
|
||||
; clobbered by other data between decrunches.
|
||||
; -------------------------------------------------------------------
|
||||
decrunch_table:
|
||||
.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
||||
.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
||||
.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
||||
.IF EXTRA_TABLE_ENTRY_FOR_LENGTH_THREE <> 0
|
||||
.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
||||
.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
||||
.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
||||
.ENDIF
|
||||
.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
||||
.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
||||
.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
||||
.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
||||
.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
||||
.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
||||
.byte 0,0,0,0,0,0,0,0,0,0,0,0
|
||||
; -------------------------------------------------------------------
|
||||
; end of decruncher
|
||||
; -------------------------------------------------------------------
|
||||
|
|
@ -1,79 +1,98 @@
|
|||
; -------------------------------------------------------------------
|
||||
; this file is intended to be assembled and linked with the cc65 toolchain.
|
||||
; It has not been tested with any other assemblers or linkers.
|
||||
; -------------------------------------------------------------------
|
||||
; -------------------------------------------------------------------
|
||||
; example usage of the standard decruncher
|
||||
; this program decrunches data to memory
|
||||
; -------------------------------------------------------------------
|
||||
; if decrunching forwards then the following line must be uncommented.
|
||||
;DECRUNCH_FORWARDS = 1
|
||||
.IFNDEF DECRUNCH_FORWARDS
|
||||
DECRUNCH_FORWARDS = 0
|
||||
.ENDIF
|
||||
; -------------------------------------------------------------------
|
||||
;.import decrunch
|
||||
;.export get_crunched_byte
|
||||
;.import end_of_data
|
||||
.include "zp.inc"
|
||||
.include "hardware.inc"
|
||||
|
||||
; .byte $01,$08,$0b,$08,<2003,>2003,$9e,'2','0','6','1',0,0,0
|
||||
; -------------------------------------------------------------------
|
||||
; we begin here
|
||||
; -------------------------------------------------------------------
|
||||
exomizer_test:
|
||||
|
||||
lda #$20
|
||||
sta zp_dest_hi
|
||||
lda #$00
|
||||
sta zp_dest_lo
|
||||
bit SET_GR
|
||||
bit PAGE1
|
||||
bit HIRES
|
||||
bit FULLGR
|
||||
|
||||
|
||||
.IF DECRUNCH_FORWARDS = 0
|
||||
lda $04
|
||||
sta _byte_lo
|
||||
lda $05
|
||||
sta _byte_hi
|
||||
.ELSE
|
||||
lda #<end_of_data
|
||||
lda #<data_begin
|
||||
sta _byte_lo
|
||||
lda #>end_of_data
|
||||
lda #>data_begin
|
||||
sta _byte_hi
|
||||
|
||||
; lda $02
|
||||
; sta _byte_lo
|
||||
; lda $03
|
||||
; sta _byte_hi
|
||||
.ENDIF
|
||||
jsr decrunch
|
||||
jsr decrunch
|
||||
|
||||
.if 0
|
||||
|
||||
; lda #<data_begin
|
||||
; sta zp_src_lo
|
||||
; lda #>data_begin
|
||||
; sta zp_src_hi
|
||||
|
||||
|
||||
lda #$1F
|
||||
pha
|
||||
lda #>(data_end) ; sizehi2
|
||||
pha
|
||||
lda #<(data_end) ; sizelo2
|
||||
pha
|
||||
lda #>(start_d-1) ; #>(@loaddecrunch - 1)
|
||||
pha
|
||||
lda #<(start_d-1) ; #<(@loaddecrunch - 1)
|
||||
pha
|
||||
|
||||
jmp decrunch_table
|
||||
|
||||
|
||||
;decrunch_table:
|
||||
;!warn "entry=",*
|
||||
; pla ; <loaddecrunch
|
||||
; tay
|
||||
|
||||
; pla ; >loaddecrunch
|
||||
; tax
|
||||
; clc
|
||||
|
||||
; pla ; sizelo2
|
||||
; adc #$F8
|
||||
; sta _byte_lo
|
||||
|
||||
; pla ;sizehi2
|
||||
; sta zp_bitbuf
|
||||
|
||||
; pla ;#$1F
|
||||
; adc zp_bitbuf
|
||||
; sta _byte_hi
|
||||
|
||||
; txa
|
||||
; pha
|
||||
|
||||
; tya
|
||||
; pha
|
||||
|
||||
; jmp decrunch
|
||||
|
||||
|
||||
|
||||
|
||||
; jsr decrunch
|
||||
|
||||
.endif
|
||||
|
||||
end:
|
||||
jmp end
|
||||
|
||||
; -------------------------------------------------------------------
|
||||
|
||||
get_crunched_byte:
|
||||
.IF DECRUNCH_FORWARDS = 0
|
||||
lda _byte_lo
|
||||
bne _byte_skip_hi
|
||||
dec _byte_hi
|
||||
_byte_skip_hi:
|
||||
dec _byte_lo
|
||||
.ENDIF
|
||||
_byte_lo = * + 1
|
||||
_byte_hi = * + 2
|
||||
lda $ffff ; needs to be set correctly before
|
||||
|
||||
.IF DECRUNCH_FORWARDS <> 0
|
||||
inc _byte_lo
|
||||
bne _byte_skip_hi
|
||||
inc _byte_hi
|
||||
lda $1234 ; needs to be set correctly before
|
||||
; decrunch_file is called.
|
||||
inc _byte_lo
|
||||
bne _byte_skip_hi
|
||||
inc _byte_hi
|
||||
_byte_skip_hi:
|
||||
.ENDIF
|
||||
rts ; decrunch_file is called.
|
||||
; end_of_data needs to point to the address just after the address
|
||||
; of the last byte of crunched data.
|
||||
; -------------------------------------------------------------------
|
||||
rts
|
||||
|
||||
start_d:
|
||||
|
||||
.include "exodecrunch.s"
|
||||
|
||||
.incbin "level5.exo"
|
||||
|
||||
end_of_data:
|
||||
data_begin:
|
||||
.byte $20,$00
|
||||
.incbin "level5.exo"
|
||||
data_end:
|
||||
|
|
|
|||
|
|
@ -4,7 +4,7 @@
|
|||
lzsa_test:
|
||||
|
||||
bit SET_GR
|
||||
bit PAGE0
|
||||
bit PAGE1
|
||||
bit HIRES
|
||||
bit FULLGR
|
||||
|
||||
|
|
|
|||
|
|
@ -4,7 +4,7 @@
|
|||
lzsa_test:
|
||||
|
||||
bit SET_GR
|
||||
bit PAGE0
|
||||
bit PAGE1
|
||||
bit HIRES
|
||||
bit FULLGR
|
||||
|
||||
|
|
|
|||
|
|
@ -4,7 +4,7 @@
|
|||
lzsa_test:
|
||||
|
||||
bit SET_GR
|
||||
bit PAGE0
|
||||
bit PAGE1
|
||||
bit HIRES
|
||||
bit FULLGR
|
||||
|
||||
|
|
|
|||
|
|
@ -4,7 +4,7 @@
|
|||
lzsa_test:
|
||||
|
||||
bit SET_GR
|
||||
bit PAGE0
|
||||
bit PAGE1
|
||||
bit HIRES
|
||||
bit FULLGR
|
||||
|
||||
|
|
|
|||
|
|
@ -1,5 +1,31 @@
|
|||
all:
|
||||
include ../../Makefile.inc
|
||||
|
||||
clean:
|
||||
rm -f *~
|
||||
DOS33 = ../../utils/dos33fs-utils/dos33
|
||||
TOKENIZE = ../../utils/asoft_basic-utils/tokenize_asoft
|
||||
LINKERSCRIPTS = ../../linker_scripts
|
||||
EMPTYDISK = ../../empty_disk/empty.dsk
|
||||
|
||||
all: cd.dsk
|
||||
|
||||
cd.dsk: HELLO HORIZ
|
||||
cp $(EMPTYDISK) cd.dsk
|
||||
$(DOS33) -y cd.dsk SAVE A HELLO
|
||||
$(DOS33) -y cd.dsk BSAVE -a 0xC00 HORIZ
|
||||
|
||||
###
|
||||
|
||||
HELLO: hello.bas
|
||||
$(TOKENIZE) < hello.bas > HELLO
|
||||
|
||||
###
|
||||
|
||||
HORIZ: horiz.o
|
||||
ld65 -o HORIZ horiz.o -C $(LINKERSCRIPTS)/apple2_c00.inc
|
||||
|
||||
horiz.o: horiz.s
|
||||
ca65 -o horiz.o horiz.s -l horiz.lst
|
||||
|
||||
####
|
||||
|
||||
clean:
|
||||
rm -f *~ *.o *.lst HORIZ
|
||||
|
|
|
|||
|
|
@ -0,0 +1,204 @@
|
|||
; horizontal star wipe
|
||||
|
||||
; initial code = 164 bytes
|
||||
|
||||
GBASL = $26
|
||||
GBASH = $27
|
||||
BASL = $28
|
||||
BASH = $29
|
||||
|
||||
OFFSET_POINTER = $FE
|
||||
LINE = $FF
|
||||
|
||||
|
||||
SET_GR = $C050
|
||||
SET_TEXT = $C051
|
||||
FULLGR = $C052
|
||||
TEXTGR = $C053
|
||||
PAGE0 = $C054
|
||||
PAGE1 = $C055
|
||||
LORES = $C056 ; Enable LORES graphics
|
||||
HIRES = $C057 ; Enable HIRES graphics
|
||||
|
||||
PLOT = $F800 ;; PLOT AT Y,A
|
||||
PLOT1 = $F80E ;; PLOT at (GBASL),Y (need MASK to be $0f or $f0)
|
||||
HLINE = $F819 ;; HLINE Y,$2C at A
|
||||
VLINE = $F828 ;; VLINE A,$2D at Y
|
||||
CLRSCR = $F832 ;; Clear low-res screen
|
||||
CLRTOP = $F836 ;; clear only top of low-res screen
|
||||
GBASCALC= $F847 ;; take Y-coord/2 in A, put address in GBASL/H ( a trashed, C clear)
|
||||
SETCOL = $F864 ;; COLOR=A
|
||||
|
||||
SETTXT = $FB36
|
||||
SETGR = $FB40
|
||||
|
||||
BASCALC = $FBC1 ; Y-Coord in A, address in BASL/H, X,Y preserved
|
||||
WAIT = $FCA8 ;; delay 1/2(26+27A+5A^2) us
|
||||
|
||||
|
||||
;================================
|
||||
; Clear screen and setup graphics
|
||||
;================================
|
||||
horiz:
|
||||
|
||||
jsr SETGR ; set lo-res 40x40 mode
|
||||
bit SET_GR
|
||||
bit FULLGR ; make it 40x48
|
||||
|
||||
lda #3
|
||||
sta LINE
|
||||
lda #0
|
||||
sta OFFSET_POINTER
|
||||
|
||||
forever_loop:
|
||||
|
||||
lda #$0
|
||||
sta OFFSET_POINTER
|
||||
|
||||
ldx #0
|
||||
big_loop:
|
||||
|
||||
txa
|
||||
pha
|
||||
jsr BASCALC
|
||||
|
||||
ldy #39
|
||||
ldx OFFSET_POINTER
|
||||
hlin:
|
||||
tya
|
||||
|
||||
; if signed (y>offset) && (y<endoffset) draw
|
||||
; if signed (y<=offset) || (y>endoffset) don't draw
|
||||
|
||||
clc
|
||||
sbc offsets,X
|
||||
bvs gurg
|
||||
eor #$80
|
||||
gurg:
|
||||
bpl skip_pixel ; neg if A<=offset
|
||||
|
||||
tya
|
||||
clc
|
||||
sbc endoffsets,X
|
||||
bvs gurg2
|
||||
eor #$80
|
||||
gurg2:
|
||||
bmi skip_pixel ; neg if A<=endoffset
|
||||
|
||||
color_smc:
|
||||
lda #$3b
|
||||
jmp blah ; TODO: USE BIT TRICK
|
||||
skip_pixel:
|
||||
lda #$0 ;
|
||||
blah:
|
||||
sta (BASL),Y
|
||||
dey
|
||||
bpl hlin
|
||||
|
||||
lda #$bb
|
||||
sta color_smc+1
|
||||
|
||||
|
||||
;==========================================
|
||||
; draw star at beginning of line
|
||||
|
||||
lda offsets,X
|
||||
bmi skip_star
|
||||
|
||||
clc
|
||||
lda BASL
|
||||
adc offsets,X
|
||||
sta BASL
|
||||
|
||||
ldx LINE
|
||||
|
||||
ldy #7 ; 8-bits wide
|
||||
lda star_bitmap-1,X ; get low bit of bitmap into carry
|
||||
draw_line_loop:
|
||||
lsr
|
||||
|
||||
pha
|
||||
|
||||
bcc its_transparent
|
||||
|
||||
lda #$ff ; white
|
||||
sta (BASL),Y ; draw on screen
|
||||
its_transparent:
|
||||
|
||||
pla
|
||||
|
||||
dey
|
||||
bpl draw_line_loop
|
||||
|
||||
skip_star:
|
||||
|
||||
; see if new line
|
||||
|
||||
ldx OFFSET_POINTER
|
||||
|
||||
dec LINE
|
||||
bne not3
|
||||
|
||||
lda #$b3
|
||||
sta color_smc+1
|
||||
|
||||
dec offsets,X
|
||||
dec endoffsets,X
|
||||
|
||||
inc OFFSET_POINTER
|
||||
lda #3
|
||||
sta LINE
|
||||
|
||||
not3:
|
||||
|
||||
;==========================
|
||||
|
||||
pla
|
||||
tax
|
||||
|
||||
inx
|
||||
cpx #24
|
||||
bne big_loop
|
||||
|
||||
|
||||
; set/flip pages
|
||||
; we want to flip pages and then draw to the offscreen one
|
||||
|
||||
;flip_pages:
|
||||
; ldx #0 ; x already 0
|
||||
; lda draw_page_smc+1 ; DRAW_PAGE
|
||||
;; beq done_page
|
||||
; inx
|
||||
;done_page:
|
||||
; ldy PAGE0,X ; set display page to PAGE1 or PAGE2
|
||||
; eor #$4 ; flip draw page between $400/$800
|
||||
; sta draw_page_smc+1 ; DRAW_PAGE
|
||||
|
||||
|
||||
lda #80
|
||||
jsr WAIT
|
||||
|
||||
jmp forever_loop
|
||||
|
||||
|
||||
offsets:
|
||||
.byte 5,4,3,2,1,2,3,4,5
|
||||
|
||||
endoffsets:
|
||||
.byte 30,20,10,20,30,40,50,12
|
||||
|
||||
; 76543210
|
||||
; @
|
||||
; @@@@@
|
||||
; @ @
|
||||
|
||||
star_bitmap:
|
||||
.byte $50
|
||||
.byte $f8
|
||||
.byte $20
|
||||
|
||||
|
||||
|
||||
; for bot
|
||||
|
||||
jmp horiz
|
||||
|
|
@ -0,0 +1,199 @@
|
|||
; horizontal star wipe
|
||||
|
||||
; initial code = 164 bytes
|
||||
; 163 bytes = jmp to bra
|
||||
; 158 bytes = cleanup initialization
|
||||
; 156 bytes = BIT trick
|
||||
; 154 bytes = set offsets properly
|
||||
; 151 bytes = redo init
|
||||
|
||||
GBASL = $26
|
||||
GBASH = $27
|
||||
BASL = $28
|
||||
BASH = $29
|
||||
|
||||
OFFSET_POINTER = $FE
|
||||
LINE = $FF
|
||||
|
||||
SET_GR = $C050
|
||||
SET_TEXT = $C051
|
||||
FULLGR = $C052
|
||||
TEXTGR = $C053
|
||||
PAGE1 = $C054
|
||||
PAGE2 = $C055
|
||||
LORES = $C056 ; Enable LORES graphics
|
||||
HIRES = $C057 ; Enable HIRES graphics
|
||||
|
||||
HGR2 = $F3D8
|
||||
SETTXT = $FB36
|
||||
SETGR = $FB40
|
||||
|
||||
BASCALC = $FBC1 ; Y-Coord in A, address in BASL/H, X,Y preserved
|
||||
WAIT = $FCA8 ;; delay 1/2(26+27A+5A^2) us
|
||||
|
||||
|
||||
;================================
|
||||
; Clear screen and setup graphics
|
||||
;================================
|
||||
horiz:
|
||||
|
||||
jsr SETGR ; set lo-res 40x40 mode, PAGE1
|
||||
bit FULLGR ; show full screen
|
||||
|
||||
lda #3 ; count down from 3 to 0 each subline
|
||||
sta LINE
|
||||
|
||||
forever_loop:
|
||||
|
||||
lda #$0 ; offset into the length pointers
|
||||
sta OFFSET_POINTER
|
||||
; A = screen line, 0..24
|
||||
big_loop:
|
||||
|
||||
pha ; save screen line on stack
|
||||
|
||||
jsr BASCALC ; calculate address of line in BASL/BASH
|
||||
|
||||
ldy #39 ; draw 40 pixels on screen
|
||||
ldx OFFSET_POINTER ; get pointer to the offsets
|
||||
hlin:
|
||||
tya
|
||||
|
||||
; if signed (y>offset) && (y<endoffset) draw
|
||||
; if signed (y<=offset) || (y>endoffset) don't draw
|
||||
|
||||
clc
|
||||
sbc offsets,X
|
||||
bvs gurg
|
||||
eor #$80
|
||||
gurg:
|
||||
bpl skip_pixel ; neg if A<=offset
|
||||
|
||||
tya
|
||||
clc
|
||||
sbc endoffsets,X
|
||||
bvs gurg2
|
||||
eor #$80
|
||||
gurg2:
|
||||
bmi skip_pixel ; neg if A<=endoffset
|
||||
|
||||
color_smc:
|
||||
lda #$3b
|
||||
.byte $2c ; bit trick, skips next two bytes
|
||||
skip_pixel:
|
||||
lda #$0 ; color black otherwise
|
||||
blah:
|
||||
sta (BASL),Y ; write out pixel
|
||||
|
||||
dey ; decrement Xcoord
|
||||
bpl hlin ; loop until done all 40 pixels
|
||||
|
||||
lda #$bb ; force color to all-pink
|
||||
sta color_smc+1
|
||||
|
||||
|
||||
;==========================================
|
||||
; draw star at beginning of line
|
||||
|
||||
lda offsets,X ; only draw if on-screen
|
||||
bmi skip_star
|
||||
|
||||
clc ; modify x-coord
|
||||
lda BASL
|
||||
adc offsets,X
|
||||
sta BASL
|
||||
|
||||
ldx LINE ; which line of bitmap to use
|
||||
|
||||
ldy #7 ; 8-bits wide
|
||||
lda star_bitmap-1,X ; get low bit of bitmap into carry
|
||||
draw_line_loop:
|
||||
lsr
|
||||
|
||||
pha
|
||||
|
||||
bcc its_transparent
|
||||
|
||||
lda #$ff ; white
|
||||
sta (BASL),Y ; draw on screen
|
||||
its_transparent:
|
||||
|
||||
pla
|
||||
|
||||
dey
|
||||
bpl draw_line_loop
|
||||
|
||||
skip_star:
|
||||
|
||||
|
||||
|
||||
ldx OFFSET_POINTER
|
||||
|
||||
; see if new offset (meaning, we've gone three lines)
|
||||
|
||||
dec LINE
|
||||
bne not3
|
||||
|
||||
;======================
|
||||
; new line
|
||||
;======================
|
||||
|
||||
|
||||
lda #$b3
|
||||
sta color_smc+1 ; add shadow to (top?) of line
|
||||
|
||||
dec offsets,X ; scroll the line length
|
||||
dec endoffsets,X
|
||||
|
||||
inc OFFSET_POINTER ; point to next set of offsets
|
||||
|
||||
lda #3 ; reset line vlue
|
||||
sta LINE
|
||||
|
||||
not3:
|
||||
|
||||
;==========================
|
||||
|
||||
pla ; restore line count
|
||||
clc
|
||||
adc #1
|
||||
cmp #24
|
||||
; tax
|
||||
|
||||
; inx
|
||||
; cpx #24 ; see if reached bottom
|
||||
bne big_loop
|
||||
|
||||
|
||||
; ideally we'd page flip, no room though
|
||||
|
||||
|
||||
lda #80 ; delay a bit
|
||||
jsr WAIT
|
||||
|
||||
beq forever_loop
|
||||
|
||||
|
||||
|
||||
|
||||
offsets:
|
||||
.byte 30,29,31,38,31,34,32,35
|
||||
|
||||
endoffsets:
|
||||
.byte 60,50,61,68,61,64,62,65
|
||||
|
||||
|
||||
; 76543210
|
||||
; @
|
||||
; @@@@@
|
||||
; @ @
|
||||
|
||||
star_bitmap:
|
||||
.byte $50
|
||||
.byte $f8
|
||||
.byte $20
|
||||
|
||||
|
||||
; for bot
|
||||
|
||||
jmp horiz
|
||||
Loading…
Reference in New Issue