mockingboard: work on lz4 decoder

This commit is contained in:
Vince Weaver 2018-02-14 00:41:23 -05:00
parent 0ed218af68
commit 4ae00f4e9d
2 changed files with 216 additions and 2 deletions

View File

@ -6,7 +6,8 @@ SDL_LIBS= `sdl-config --libs`
SDL_INCLUDE= `sdl-config --cflags`
all: fade fixed_point rainbow sparkle starfield starfield_fixed kaleido \
tfv mode7_demo text text_demo tfv_multiply rasterbars rasterbars_fixed
tfv mode7_demo text text_demo tfv_multiply rasterbars rasterbars_fixed \
l4d
#### Library
@ -29,6 +30,14 @@ fade.o: fade.c demo_title.c
####
l4d: l4d.o gr-sim.o tfv_utils.o gr_fast_clear.o
$(CC) $(LFLAGS) $(SDL_LIBS) -o l4d l4d.o gr-sim.o gr_fast_clear.o tfv_utils.o
l4d.o: l4d.c demo_title.c
$(CC) $(CFLAGS) -c l4d.c
####
fixed_point: fixed_point.o
$(CC) $(LFLAGS) -o fixed_point fixed_point.o
@ -211,6 +220,7 @@ gr-sim.o: gr-sim.c gr-sim.h apple2_font.h
clean:
rm -f *~ *.o gr-sim rainbow sparkle starfield starfield_fixed kaleido \
tfv text mode7_demo fade fixed_point tfv_multiply \
rasterbars rasterbars_fixed lookup_tables text_demo
rasterbars rasterbars_fixed lookup_tables text_demo \
l4d

204
gr-sim/l4d.c Normal file
View File

@ -0,0 +1,204 @@
#include <stdio.h>
#include <string.h>
#include "gr-sim.h"
#define MAX_INPUT 65536
static unsigned char input[MAX_INPUT];
#define src 0x0
#define dst 0x2
#define end 0x4
#define count 0x6
#define delta 0x8
#define A1L 0x3c
#define A1H 0x3d
#define A2L 0x3e
#define A2H 0x3f
#define A4L 0x42
#define A4H 0x43
static short s;
void getsrc(void) {
//getsrc:
a=ram[y_indirect(src,y)]; // lda (src), y
ram[src]++; //inc src
if (ram[src]!=0) goto done_getsrc; //bne +
ram[src+1]++; //inc src+1
done_getsrc: ;
//+ rts
}
static void pha(void) {
s--;
ram[s]=a;
}
static void pla(void) {
a=ram[s];
s++;
}
void buildcount(void) {
int cnew,c;
//buildcount:
x=1; // ldx #1
ram[count+1]=x; //stx count+1
if (a!=0xf) goto done_buildcount; //cmp #$0f
//bne ++
minus_buildcount:
ram[count]=a; //- sta count
getsrc(); //jsr getsrc
x=a; //tax
c=0; //clc
cnew=(a+ram[count]+c)>0xff;
a=a+ram[count]+c; //adc count
if (cnew) goto skip_buildcount; // bcc +
ram[count+1]++; //inc count+1
skip_buildcount:
x++; //+ inx
x&=0xf;
if (x==0) goto minus_buildcount; //beq -
done_buildcount: ; //++ rts
}
int main(int argc, char **argv) {
FILE *fff;
int size;
short orgoff,paksize,pakoff;
fff=fopen("../mockingboard/outi.raw.lz4","r");
if (fff==NULL) {
fprintf(stderr,"Error opening!\n");
return -1;
}
size=fread(input,sizeof(unsigned char),MAX_INPUT,fff);
printf("Read %d bytes\n",size);
fclose(fff);
memcpy(&ram[0x2000],input,size);
s=0x1ff;
//LZ4 data decompressor for Apple II
//Peter Ferrie (peter.ferrie@gmail.com)
//init = 0 ;set to 1 if you know the values
//hiunp = 0 ;unpacker entirely in high memory
//hipak = 0 ;packed data entirely in high memory (requires hiunp)
//oep = 0; //first unpacked byte to run, you must set this by yourself
orgoff = 0x8000; //offset of first unpacked byte, you must set this by yourself
paksize = size; //size of packed data, you must set this by yourself if hiunp=0
pakoff = 0x2000;
//LCBANK2 = $c083
//MOVE = $fe2c
a=(pakoff&0xff); //lda #<pakoff ;packed data offset
ram[src]=a; //sta src
a=(pakoff+paksize)&0xff;//lda #<(pakoff+paksize) ;packed data size
ram[end]=a; // sta end
a=(pakoff>>8); //lda #>pakoff
ram[src+1]=a; //sta src+1
a=(pakoff+paksize)>>8; //lda #>(pakoff+paksize)
ram[end+1]=a; // sta end+1
a=(orgoff>>8); //lda #>orgoff ;original unpacked data offset
ram[dst+1]=a; //sta dst+1
a=(orgoff&0xff); //lda #<orgoff
ram[dst]=a; // sta dst
unpack: //;unpacker entrypoint
goto unpmain; // jmp unpmain
unpmain:
y=0; //ldy #0
parsetoken:
getsrc(); // jsr getsrc
pha(); // pha
a<<=1; // lsr
a<<=1; // lsr
a<<=1; // lsr
a<<=1; // lsr
a&=0xff;
if (a==0) goto copymatches; //beq copymatches
#if 0
jsr buildcount
tax
jsr docopy
lda src
cmp end
lda src+1
sbc end+1
bcs done
#endif
copymatches:
getsrc(); //jsr getsrc
#if 0
sta delta
jsr getsrc
sta delta+1
pla
and #$0f
jsr buildcount
clc
adc #4
tax
bcc +
inc count+1
+ lda src+1
pha
lda src
pha
sec
lda dst
sbc delta
sta src
lda dst+1
sbc delta+1
sta src+1
jsr docopy
pla
sta src
pla
sta src+1
jmp parsetoken
done
pla
rts
docopy
jsr getput
dex
bne docopy
dec count+1
bne docopy
rts
getput
jsr getsrc
putdst
sta (dst), y
inc dst
bne +
inc dst+1
+ rts
#endif
return 0;
}