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Add decode...code
This commit is contained in:
Peter Evans
parent
f4cdff0bfb
commit
fadf5a9782
8
include/apple2.dec.h
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8
include/apple2.dec.h
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@ -0,0 +1,8 @@
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#ifndef _APPLE2_DEC_H_
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#define _APPLE2_DEC_H_
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#include "vm_segment.h"
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extern int apple2_dec_sector(vm_segment *, vm_segment *, int, int);
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#endif
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@ -3,6 +3,7 @@ set(erc_sources
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apple2.bank.c
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apple2.dbuf.c
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apple2.dd.c
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apple2.dec.c
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apple2.draw.c
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apple2.enc.c
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apple2.kb.c
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142
src/apple2.dec.c
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142
src/apple2.dec.c
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@ -0,0 +1,142 @@
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/*
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* apple2.dec.c
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*/
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#include "vm_segment.h"
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static vm_8bit table[] = {
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0x68, 0xa2, 0x5e, 0x5f, 0xff, 0x7f, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x20, 0xa2, 0x5e, 0x5f, 0xff, 0x7f, 0x00, 0x00, 0x49, 0x62, 0x4f, 0x10, 0x01, 0x00, 0x00, 0x00,
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0x40, 0xa2, 0x5e, 0x5f, 0xff, 0x7f, 0x00, 0x00, 0x40, 0xa2, 0x5e, 0x5f, 0xff, 0x7f, 0x00, 0x00,
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0x58, 0xa2, 0x5e, 0x5f, 0xff, 0x7f, 0x00, 0x00, 0x00, 0x50, 0x61, 0x00, 0x01, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x20, 0x55, 0x4f, 0x10, 0x01, 0x00, 0x00, 0x00,
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0xc0, 0x54, 0x4f, 0x10, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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};
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#if 0
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/*
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* This is the "reverse" gcr table from enc.c; given one of the disk
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* bytes, this table can turn them back into a 6-bit byte.
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*/
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static vm_8bit rev62[] = {
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// 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 00
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 10
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 20
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 30
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 40
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 50
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 60
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 70
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 80
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x02, 0x03, 0x00, 0x04, 0x05, 0x06, // 90
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x07, 0x08, 0x00, 0x00, 0x00, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, // a0
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0x00, 0x00, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x00, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, // b0
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1b, 0x00, 0x1c, 0x1e, 0x1e, // c0
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0x00, 0x00, 0x00, 0x1f, 0x00, 0x00, 0x20, 0x21, 0x00, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, // d0
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0x00, 0x00, 0x00, 0x00, 0x00, 0x29, 0x2a, 0x2b, 0x00, 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, // e0
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0x00, 0x00, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x00, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, // f0
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};
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#endif
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#if 0
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int
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apple2_dec_sector(vm_segment *dest, vm_segment *src, int doff, int soff)
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{
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int i, orig;
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vm_8bit xoff;
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vm_8bit conv[0x157], xor[0x156];
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vm_8bit lval;
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orig = doff;
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for (i = 0; i < 0x157; i++) {
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conv[i] = table[vm_segment_get(src, soff + i) & 0x7f];
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}
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for (i = 0, lval = 0; i < 0x156; i++) {
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xor[i] = lval ^ conv[i];
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lval = xor[i];
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}
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xoff = 0xac;
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i = 0;
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while (xoff != 0x02) {
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if (xoff >= 0xac) {
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vm_segment_set(dest, doff + xoff,
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(xor[xoff + 0x56] & 0xfc) | ((xor[i] & 0x80) >> 7) | ((xor[i] & 0x40) >> 5));
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}
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xoff -= 0x56;
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vm_segment_set(dest, doff + xoff,
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(xor[xoff + 0x56] & 0xfc) | ((xor[i] & 0x20) >> 5) | ((xor[i] & 0x10) >> 3));
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xoff -= 0x56;
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vm_segment_set(dest, doff + xoff,
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(xor[xoff + 0x56] & 0xfc) | ((xor[i] & 0x08) >> 3) | ((xor[i] & 0x04) >> 1));
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xoff -= 0x53;
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i++;
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}
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#if 0
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for (i = 0; i < 0x56; i++) {
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vm_8bit vac, v56, v00,
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offac, off56;
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offac = i + 0xAC;
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off56 = i + 0x56;
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vac = (xor[offac + 0x56] & 0xfc) | ((xor[i] & 0x80) >> 7) | ((xor[i] & 0x40) >> 5);
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v56 = (xor[off56 + 0x56] & 0xfc) | ((xor[i] & 0x20) >> 5) | ((xor[i] & 0x10) >> 3);
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v00 = (xor[i + 0x56] & 0xfc) | ((xor[i] & 0x08) >> 3) | ((xor[i] & 0x04) >> 1);
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if (i == 0) {
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printf("vac = %02x, v56 = %02x, v00 = %02x\n", vac, v56, v00);
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}
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if (offac > 0xAC) {
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vm_segment_set(dest, doff + offac, vac);
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}
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vm_segment_set(dest, doff + off56, v56);
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vm_segment_set(dest, doff + i, v00);
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}
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#endif
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return 256;
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}
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#endif
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int
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apple2_dec_sector(vm_segment *dest, vm_segment *src, int doff, int soff)
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{
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vm_8bit data[500];
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int i;
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int prologue = soff;
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int epilogue = soff + 9 + 0x157;
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// Let's validate that there's really a sector where we think
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// there's one.
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if (vm_segment_get(src, prologue) != 0xd5 ||
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vm_segment_get(src, prologue + 1) != 0xaa ||
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vm_segment_get(src, prologue + 2) != 0xad ||
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vm_segment_get(src, epilogue) != 0xde ||
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vm_segment_get(src, epilogue + 1) != 0xaa ||
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vm_segment_get(src, epilogue + 2) != 0xeb
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) {
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return 0;
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}
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// We want to start with just the data field from the encoded
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// sector; this means stripping out any metadata and self-sync
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// bytes.
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for (i = soff + 9; i < epilogue; i++) {
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data[i - soff - 9] = vm_segment_get(src, i);
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}
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return 256;
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}
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73
tests/apple2.dec.c
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73
tests/apple2.dec.c
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#include <criterion/criterion.h>
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#include "apple2.dec.h"
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#if 0
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/*
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* Ripped from apple2.enc.c
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*/
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static vm_8bit f_sector[] = {
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0xdd, 0xab, 0xce, 0xd9, 0xc3, 0xf6, 0xdd, 0x77, 0x0e, 0x60, 0x6d, 0x95, 0xbd, 0xe3, 0x74, 0xc0,
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0xd4, 0xa7, 0x3f, 0xc2, 0x39, 0x37, 0xfa, 0xa7, 0xd1, 0xa9, 0xc9, 0x5e, 0xd3, 0x28, 0x47, 0x04,
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0x4f, 0xec, 0xfc, 0xc1, 0x5e, 0x90, 0x9a, 0x7d, 0x72, 0x36, 0xd0, 0x23, 0x90, 0xe5, 0x18, 0xeb,
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0x8a, 0x80, 0xad, 0xda, 0x85, 0xe4, 0xe3, 0x34, 0x72, 0x5c, 0x51, 0x18, 0xf0, 0xec, 0x3f, 0xcf,
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0xf7, 0xc1, 0x61, 0xe7, 0xad, 0x78, 0xea, 0x8a, 0xa1, 0x53, 0xbc, 0x05, 0x06, 0x77, 0x40, 0xb1,
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0xfb, 0x21, 0xf4, 0xec, 0x7a, 0xd3, 0xee, 0xcd, 0x99, 0xfa, 0x95, 0x39, 0xf8, 0xe8, 0x2d, 0xf5,
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0x40, 0x1a, 0x68, 0x0b, 0x7e, 0x96, 0x4c, 0x05, 0x03, 0x74, 0xa9, 0xca, 0x1d, 0x30, 0xf0, 0x96,
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0x7d, 0xe9, 0x24, 0xca, 0x6b, 0x09, 0x50, 0x69, 0x35, 0xe0, 0x1b, 0xd8, 0xfb, 0x62, 0x47, 0xe6,
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0x6a, 0xad, 0x3a, 0xd2, 0x5c, 0xe6, 0xda, 0x5f, 0x62, 0xfb, 0x02, 0x61, 0x2b, 0x42, 0x7a, 0x44,
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0xa2, 0x2f, 0x97, 0xe5, 0x08, 0xc7, 0xf6, 0xe1, 0x7a, 0xd6, 0x6a, 0xc0, 0x11, 0xd6, 0xa4, 0x26,
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0xac, 0xe4, 0xfb, 0xf3, 0x28, 0x8a, 0x3b, 0x1b, 0x4c, 0x9c, 0x84, 0x55, 0x73, 0x4b, 0x4f, 0xc1,
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0x0a, 0xd8, 0x9e, 0xdc, 0x1b, 0x01, 0xec, 0x12, 0x41, 0x84, 0x15, 0x8c, 0xb9, 0x29, 0x5f, 0x34,
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0x99, 0x3e, 0x3b, 0xa8, 0xcf, 0x7c, 0x65, 0x6f, 0x60, 0x45, 0x73, 0xe4, 0xea, 0x84, 0x84, 0x8b,
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0xaa, 0x46, 0x72, 0xbc, 0xd2, 0x65, 0xbe, 0x5b, 0x2d, 0x24, 0xd6, 0x41, 0x88, 0xd0, 0x6a, 0x80,
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0x1e, 0x22, 0x7a, 0x44, 0x70, 0x17, 0x44, 0x18, 0x1f, 0x31, 0x41, 0xf5, 0xa0, 0xae, 0x1b, 0xe1,
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0x4f, 0x9f, 0xdb, 0x5a, 0x74, 0x90, 0x55, 0xe1, 0x49, 0xbf, 0x2d, 0x20, 0xd6, 0x03, 0x03, 0xa2,
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};
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#endif
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/*
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* Same as above -- ripped from apple2.enc.c
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*/
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static vm_8bit f_enc_sector[] = {
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0xd5, 0xaa, 0xad, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf5, 0xaf, 0x9a, 0xd3, 0xfd, 0xb6, 0xcb,
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0xb5, 0xfa, 0xb5, 0xe6, 0xb9, 0xf3, 0xea, 0xe7, 0xd6, 0xdb, 0xad, 0xb9, 0xfe, 0xe7, 0xfd, 0xeb,
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0xfa, 0xee, 0xf3, 0xe9, 0xb7, 0xfa, 0xde, 0xcb, 0xf6, 0xcb, 0xcb, 0x96, 0xfa, 0xec, 0xaf, 0xaf,
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0xcb, 0xcb, 0xf7, 0xee, 0xec, 0xd3, 0xd9, 0xbb, 0xf6, 0xd9, 0xab, 0xbf, 0xcb, 0xcb, 0xb2, 0xa6,
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0xcb, 0x97, 0xf4, 0xf5, 0xac, 0xed, 0xb9, 0xad, 0xae, 0xdf, 0xce, 0xe9, 0xb5, 0xb5, 0x9f, 0xab,
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0xe9, 0xbc, 0x9e, 0xde, 0x9a, 0xb3, 0xb6, 0xd3, 0xdd, 0xbe, 0xd7, 0xb2, 0xd6, 0xb5, 0xac, 0xfc,
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0xce, 0xbe, 0x9e, 0x9f, 0xaf, 0xac, 0xe6, 0xcf, 0xcb, 0x9b, 0xfe, 0xac, 0xbc, 0xdc, 0xea, 0x9e,
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0xcd, 0xdd, 0xff, 0xfe, 0x9b, 0xf2, 0xbc, 0xce, 0xcf, 0xbd, 0xdc, 0xda, 0xfe, 0xcb, 0xb4, 0xb6,
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0xdf, 0x9d, 0xb3, 0xde, 0xf2, 0x9a, 0xf9, 0x9b, 0xb5, 0xf9, 0xfc, 0xe9, 0xce, 0xff, 0xfc, 0xbd,
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0x9a, 0xad, 0xce, 0xbc, 0xbd, 0x97, 0xf4, 0xb5, 0xad, 0x9b, 0xb6, 0xfa, 0xa6, 0xf3, 0xfc, 0xb2,
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0xaf, 0xdf, 0xd7, 0xb6, 0xf4, 0xdb, 0xbd, 0xac, 0xfc, 0xfb, 0xeb, 0x96, 0xcd, 0xaf, 0xfc, 0xb6,
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0xf5, 0xf4, 0x9f, 0xdc, 0xe6, 0xb3, 0xa7, 0xba, 0xbd, 0xcb, 0xe7, 0xed, 0x9d, 0xee, 0xf5, 0xea,
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0xbb, 0xcd, 0xbd, 0xce, 0xfa, 0xf5, 0xb6, 0x97, 0xce, 0xf6, 0xbd, 0xf4, 0xad, 0xed, 0xbe, 0xfa,
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0xdc, 0xf2, 0xfb, 0xdf, 0xbd, 0xbb, 0xb2, 0xbc, 0xf4, 0xfe, 0xed, 0xa7, 0xdd, 0xab, 0xdf, 0xda,
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0xee, 0xdc, 0xfa, 0xda, 0xeb, 0xb3, 0xd7, 0xb3, 0xdd, 0xfe, 0xbd, 0xb6, 0xbf, 0xb2, 0xb3, 0xf9,
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0xda, 0xeb, 0xcd, 0xfb, 0xf2, 0xae, 0x9e, 0xdd, 0xe7, 0xec, 0xe6, 0xf3, 0xee, 0xcd, 0xd6, 0xd9,
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0xb6, 0xa6, 0x9a, 0xf5, 0xdf, 0xe9, 0xa7, 0xba, 0xf3, 0x9f, 0xf3, 0xab, 0xb2, 0x97, 0xda, 0xef,
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0xf3, 0xb5, 0xb4, 0xee, 0x9f, 0xfb, 0xff, 0xb9, 0xee, 0xdb, 0xdd, 0xaf, 0xdb, 0xce, 0xbf, 0xe7,
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0xe5, 0x97, 0xdb, 0xbe, 0xe9, 0x9f, 0x9a, 0x9b, 0xab, 0xaf, 0xdc, 0x9b, 0xcb, 0x96, 0x9b, 0xa7,
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0xfb, 0xaf, 0xf2, 0xcb, 0xea, 0xf5, 0xf9, 0xce, 0x9a, 0xfc, 0xdc, 0xef, 0xbb, 0xeb, 0xfa, 0xde,
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0xb3, 0xbb, 0xb3, 0xaf, 0xbe, 0xb9, 0xbc, 0x97, 0xad, 0xcd, 0xea, 0xba, 0x9b, 0xea, 0xfe, 0xe7,
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0xf3, 0xb5, 0xd6, 0xad, 0xf9, 0xee, 0xea, 0xe6, 0xfd, 0xdb, 0x9b, 0xfd, 0xf4, 0x96, 0xdf, 0xdf,
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0xde, 0xaa, 0xeb, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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};
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Test(apple2_dec, sector)
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{
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vm_segment *src, *dest;
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src = vm_segment_create(1000);
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dest = vm_segment_create(1000);
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vm_segment_copy_buf(src, f_enc_sector, 0, 0, 382);
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printf("it's %d\n", apple2_dec_sector(dest, src, 0, 9));
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for (int i = 0; i < 256; i++) {
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printf("%02x\n", vm_segment_get(dest, i));
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}
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}
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