2019-06-14 02:54:03 +00:00
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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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2021-04-19 14:28:08 +00:00
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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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; Original copyright statement follows:
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2019-06-14 02:54:03 +00:00
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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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; the use of this software.
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;
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; Permission is granted to anyone to use this software for any purpose,
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; including commercial applications, and to alter it and redistribute it
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; freely, subject to the following restrictions:
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;
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; 1. The origin of this software must not be misrepresented; you must not
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; claim that you wrote the original software. If you use this software in a
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; product, an acknowledgment in the product documentation would be
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; appreciated but is not required.
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;
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; 2. Altered source versions must be plainly marked as such, and must not
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; be misrepresented as being the original software.
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;
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; 3. This notice may not be removed or altered from any distribution.
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;
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; 4. The names of this software and/or it's copyright holders may not be
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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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; 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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; register and must not modify the state of the carry nor the overflow flag.
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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.
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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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; -------------------------------------------------------------------
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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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; 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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2019-06-16 19:15:11 +00:00
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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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2021-04-19 14:28:08 +00:00
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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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}
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; -------------------------------------------------------------------
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2019-06-14 02:54:03 +00:00
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; zero page addresses used
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; -------------------------------------------------------------------
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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 = $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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2019-06-16 19:15:11 +00:00
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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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encoded_entries = 52
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}
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2019-06-14 02:54:03 +00:00
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tabl_bi = decrunch_table
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2019-06-16 19:15:11 +00:00
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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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2019-06-14 02:54:03 +00:00
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;; refill bits is always inlined
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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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}
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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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gb_next:
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asl zp_bitbuf
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bne gb_ok
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mac_refill_bits
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gb_ok:
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rol
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bmi gb_next
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gb_skip:
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bvc skip
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gb_get_hi:
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sec
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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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}
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} ELSE {
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!MACRO mac_get_bits {
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jsr get_bits
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}
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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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bpl gb_skip
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gb_next:
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asl zp_bitbuf
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bne gb_ok
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+mac_refill_bits
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gb_ok:
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rol
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bmi gb_next
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gb_skip:
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bvs gb_get_hi
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rts
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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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}
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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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; However, you may want to relocate the tables last in the file to a
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; more suitable address.
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; -------------------------------------------------------------------
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; -------------------------------------------------------------------
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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 #0 (it almost always is, otherwise do a cld)
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decrunch:
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2021-04-18 15:19:14 +00:00
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2021-04-19 14:28:08 +00:00
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!IF SHOW_PROGRESS_DURING_DECRUNCH = 1 {
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2021-06-11 18:36:03 +00:00
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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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2021-04-18 15:19:14 +00:00
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; -------------------------------------------------------------------
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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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2021-04-18 16:39:19 +00:00
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done_init_progress_loop:
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2021-04-19 14:28:08 +00:00
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}
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2019-06-14 02:54:03 +00:00
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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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tya
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and #$0f
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sta tabl_lo,y
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beq shortcut ; start a new sequence
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; -------------------------------------------------------------------
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txa
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adc tabl_lo - 1,y
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sta tabl_lo,y
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lda zp_len_hi
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adc tabl_hi - 1,y
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shortcut:
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sta tabl_hi,y
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; -------------------------------------------------------------------
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lda #$01
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sta <zp_len_hi
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lda #$78 ; %01111000
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+mac_get_bits
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; -------------------------------------------------------------------
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lsr
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tax
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beq rolled
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php
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rolle:
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asl zp_len_hi
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sec
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ror
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dex
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bne rolle
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plp
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rolled:
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ror
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sta tabl_bi,y
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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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no_fixup_lohi:
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txa
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; -------------------------------------------------------------------
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iny
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2019-06-16 19:15:11 +00:00
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cpy #encoded_entries
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2019-06-14 02:54:03 +00:00
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bne table_gen
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; -------------------------------------------------------------------
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; prepare for main decruncher
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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(10) bytes)
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;
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2021-05-12 05:26:38 +00:00
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!ifndef FORWARD_DECRUNCHING {
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!set FORWARD_DECRUNCHING = 1
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}
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2019-06-14 02:54:03 +00:00
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!if FORWARD_DECRUNCHING = 0 {
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literal_start1:
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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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no_hi_decr:
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dey
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jsr get_crunched_byte
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sta (zp_dest_lo),y
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2021-04-18 15:19:14 +00:00
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2021-04-19 14:28:08 +00:00
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!IF SHOW_PROGRESS_DURING_DECRUNCH = 1 {
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2021-04-18 15:19:14 +00:00
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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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2021-04-19 14:28:08 +00:00
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}
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2019-06-14 02:54:03 +00:00
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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 no_hi_incr
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inc zp_dest_hi
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no_hi_incr:
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}
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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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dex
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lda zp_bitbuf
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no_literal1:
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asl
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bne nofetch8
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jsr get_crunched_byte
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rol
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nofetch8:
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inx
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bcc no_literal1
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sta zp_bitbuf
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; -------------------------------------------------------------------
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; check for literal byte (2 bytes)
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;
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beq literal_start1
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; -------------------------------------------------------------------
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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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!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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bcs exit_or_lit_seq
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}
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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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lda tabl_bi - 1,x
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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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!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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; -------------------------------------------------------------------
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; here we decide what offset table to use (27(26) bytes) + get_bits_nc macro
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; z-flag reflects zp_len_hi here
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;
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ldx zp_len_lo
|
2019-06-16 19:15:11 +00:00
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} ELSE {
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2019-06-14 02:54:03 +00:00
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tax
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}
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lda #$e1
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2019-06-16 19:15:11 +00:00
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!IFDEF EXTRA_TABLE_ENTRY_FOR_LENGTH_THREE {
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cpx #$04
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} ELSE {
|
2019-06-14 02:54:03 +00:00
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cpx #$03
|
2019-06-16 19:15:11 +00:00
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}
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2019-06-14 02:54:03 +00:00
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bcs gbnc2_next
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2019-06-16 19:15:11 +00:00
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lda tabl_bit - 1,x
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2019-06-14 02:54:03 +00:00
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gbnc2_next:
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asl zp_bitbuf
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bne gbnc2_ok
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tax
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jsr get_crunched_byte
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rol
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sta zp_bitbuf
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txa
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gbnc2_ok:
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rol
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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) (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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}
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lda tabl_bi,x
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+mac_get_bits
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!if FORWARD_DECRUNCHING = 0 {
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|
adc tabl_lo,x
|
|
|
|
sta zp_src_lo
|
|
|
|
lda zp_bits_hi
|
|
|
|
adc tabl_hi,x
|
|
|
|
adc zp_dest_hi
|
|
|
|
} else {
|
|
|
|
clc
|
|
|
|
adc tabl_lo,x
|
|
|
|
eor #$ff
|
|
|
|
sta zp_src_lo
|
|
|
|
lda zp_dest_hi
|
|
|
|
bcc skip_dest_hi
|
|
|
|
sbc #1
|
|
|
|
clc
|
|
|
|
skip_dest_hi:
|
|
|
|
sbc zp_bits_hi
|
|
|
|
sbc tabl_hi,x
|
|
|
|
clc
|
|
|
|
}
|
|
|
|
sta zp_src_hi
|
|
|
|
; -------------------------------------------------------------------
|
|
|
|
; prepare for copy loop (2 bytes)
|
|
|
|
;
|
|
|
|
pre_copy:
|
|
|
|
ldx zp_len_lo
|
|
|
|
; -------------------------------------------------------------------
|
|
|
|
; main copy loop (30 bytes)
|
|
|
|
;
|
|
|
|
copy_next:
|
|
|
|
!if FORWARD_DECRUNCHING = 0 {
|
|
|
|
tya
|
|
|
|
bne copy_skip_hi
|
|
|
|
dec zp_dest_hi
|
|
|
|
dec zp_src_hi
|
|
|
|
copy_skip_hi:
|
|
|
|
dey
|
|
|
|
}
|
|
|
|
!IFNDEF LITERAL_SEQUENCES_NOT_USED {
|
|
|
|
bcs get_literal_byte
|
|
|
|
}
|
|
|
|
lda (zp_src_lo),y
|
|
|
|
literal_byte_gotten:
|
|
|
|
sta (zp_dest_lo),y
|
|
|
|
!if FORWARD_DECRUNCHING = 1 {
|
|
|
|
iny
|
|
|
|
bne copy_skip_hi
|
|
|
|
inc zp_dest_hi
|
|
|
|
inc zp_src_hi
|
|
|
|
copy_skip_hi:
|
|
|
|
}
|
|
|
|
dex
|
|
|
|
bne copy_next
|
|
|
|
!IFNDEF MAX_SEQUENCE_LENGTH_256 {
|
|
|
|
lda zp_len_hi
|
|
|
|
!IFDEF INLINE_GET_BITS {
|
|
|
|
bne copy_next_hi
|
|
|
|
}
|
|
|
|
}
|
|
|
|
begin_stx:
|
|
|
|
stx zp_bits_hi
|
|
|
|
!IFNDEF INLINE_GET_BITS {
|
|
|
|
beq next_round
|
|
|
|
} ELSE {
|
|
|
|
jmp next_round
|
|
|
|
}
|
|
|
|
!IFNDEF MAX_SEQUENCE_LENGTH_256 {
|
|
|
|
copy_next_hi:
|
|
|
|
dec zp_len_hi
|
|
|
|
jmp copy_next
|
|
|
|
}
|
|
|
|
!IFNDEF LITERAL_SEQUENCES_NOT_USED {
|
|
|
|
get_literal_byte:
|
|
|
|
jsr get_crunched_byte
|
|
|
|
bcs literal_byte_gotten
|
|
|
|
}
|
|
|
|
; -------------------------------------------------------------------
|
|
|
|
; exit or literal sequence handling (16(12) bytes)
|
|
|
|
;
|
|
|
|
exit_or_lit_seq:
|
|
|
|
!IFNDEF LITERAL_SEQUENCES_NOT_USED {
|
|
|
|
beq decr_exit
|
|
|
|
jsr get_crunched_byte
|
|
|
|
!IFNDEF MAX_SEQUENCE_LENGTH_256 {
|
|
|
|
sta zp_len_hi
|
|
|
|
}
|
|
|
|
jsr get_crunched_byte
|
|
|
|
tax
|
|
|
|
bcs copy_next
|
|
|
|
decr_exit:
|
|
|
|
}
|
|
|
|
rts
|
2019-06-16 19:15:11 +00:00
|
|
|
!IFDEF EXTRA_TABLE_ENTRY_FOR_LENGTH_THREE {
|
2019-06-14 02:54:03 +00:00
|
|
|
; -------------------------------------------------------------------
|
2019-06-16 19:15:11 +00:00
|
|
|
; 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
|
2019-06-14 02:54:03 +00:00
|
|
|
tabl_bit:
|
2019-06-16 19:15:11 +00:00
|
|
|
!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
|
|
|
|
}
|
2021-04-19 14:28:08 +00:00
|
|
|
!IF SHOW_PROGRESS_DURING_DECRUNCH = 1 {
|
2021-04-18 15:19:14 +00:00
|
|
|
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
|
2021-04-19 14:28:08 +00:00
|
|
|
}
|
2019-06-14 02:54:03 +00:00
|
|
|
; -------------------------------------------------------------------
|
|
|
|
; end of decruncher
|
|
|
|
; -------------------------------------------------------------------
|
|
|
|
|
|
|
|
; -------------------------------------------------------------------
|
2019-06-16 19:15:11 +00:00
|
|
|
; this 156 (204) byte table area may be relocated. It may also be
|
|
|
|
; clobbered by other data between decrunches.
|
2019-06-14 02:54:03 +00:00
|
|
|
; -------------------------------------------------------------------
|
2021-06-19 03:36:30 +00:00
|
|
|
decrunch_table=$200;;:
|
2019-06-16 19:15:11 +00:00
|
|
|
;; .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
|
2019-06-14 02:54:03 +00:00
|
|
|
; -------------------------------------------------------------------
|
|
|
|
; end of decruncher
|
|
|
|
; -------------------------------------------------------------------
|