mirror of https://github.com/trudnai/Steve2.git
650 lines
18 KiB
C
650 lines
18 KiB
C
//
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// woz.c
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// Steve ][
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//
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// Created by Tamas Rudnai on 2/15/20.
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// Copyright © 2019, 2020 Tamas Rudnai. All rights reserved.
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//
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// This file is part of Steve ][ -- The Apple ][ Emulator.
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//
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// Steve ][ is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Steve ][ is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Steve ][. If not, see <https://www.gnu.org/licenses/>.
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//
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#include <stdlib.h>
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#include <string.h>
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#include "woz.h"
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#include "disk.h"
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#include "6502.h"
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#include "common.h"
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WOZread_t WOZread = {0};
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WOZread_t WOZwrite = {0};
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int trackWRoffset = 0;
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int trackOffset = 0;
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int bitOffset = 0;
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uint64_t clkelpased;
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char woz_filename[MAXFILENAME];
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woz_flags_t woz_flags = {0,0,0,0};
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size_t woz_file_size = 0;
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uint8_t * woz_file_buffer = NULL;
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woz_header_t * woz_header;
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woz_chunk_header_t * woz_chunk_header;
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woz_tmap_t * woz_tmap;
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woz1_trks_t * woz_trks;
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int track_loaded = -1;
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#pragma pack(push, 1)
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typedef union trackEntry_u {
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struct {
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uint8_t data;
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uint8_t shift;
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};
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uint16_t shift16;
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} trackEntry_t;
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#pragma pack(pop)
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trackEntry_t prepared_track[WOZ1_TRACK_BYTE_COUNT];
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typedef enum readState_e {
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readNormal = 0,
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readHold,
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} readState_t;
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readState_t readState = readNormal;
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uint8_t readLatch;
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void woz_loadTrack_old( int track ) {
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trackEntry_t reg = {0};
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reg.shift = (*woz_trks)[track].data[0];
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reg.data = (*woz_trks)[track].data[1];
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prepared_track[0] = reg;
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for ( int offs = 1; offs < WOZ1_TRACK_BYTE_COUNT; offs++ ) {
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for ( int i = 0; i < 8; i++ ) {
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if (reg.shift & 0x80) {
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reg.shift = 0;
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}
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reg.shift16 <<= 1;
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}
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reg.data = (*woz_trks)[track].data[ (offs + 1) % WOZ1_TRACK_BYTE_COUNT ];
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prepared_track[offs] = reg;
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}
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}
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typedef enum wozTrackState_e {
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wozTrackState_Start = 0,
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wozTrackState_D5,
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wozTrackState_D5_AA,
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wozTrackState_D5_AA_96,
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wozTrackState_vol1,
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wozTrackState_vol2,
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wozTrackState_trk1,
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wozTrackState_trk2,
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wozTrackState_sec1,
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wozTrackState_sec2,
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wozTrackState_END,
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} wozTrackState_t;
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int bitOffs_D5_SecHdr = 0;
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int vol = 0;
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int trk = 0;
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int sec = 0;
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wozTrackState_t woz_decodeTrkSec( uint8_t data, uint64_t clkelapsed, int bitOffs ) {
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static wozTrackState_t wozTrackState = wozTrackState_Start;
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if ( clkelpased > 40 ) {
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// spent too much time on reading, we cannot reliably decode sector header
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wozTrackState = wozTrackState_Start;
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}
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switch (wozTrackState) {
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case wozTrackState_D5:
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switch (data) {
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case 0xAA:
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// printf("D5 AA at bitOffset:%d\n", bitOffs);
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wozTrackState = wozTrackState_D5_AA;
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break;
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default:
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wozTrackState = wozTrackState_Start;
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break;
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}
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break;
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case wozTrackState_D5_AA:
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switch (data) {
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case 0x96:
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wozTrackState = wozTrackState_vol1;
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// printf("D5 AA 96 at bitOffset:%d\n", bitOffs);
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// printf("Sector Header at bitOffset:%d\n", bitOffs_D5_SecHdr);
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break;
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default:
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wozTrackState = wozTrackState_Start;
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break;
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}
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break;
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case wozTrackState_vol1:
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vol = (data << 1) | 1;
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wozTrackState = wozTrackState_vol2;
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break;
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case wozTrackState_vol2:
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vol &= data;
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wozTrackState = wozTrackState_trk1;
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break;
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case wozTrackState_trk1:
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trk = (data << 1) | 1;
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wozTrackState = wozTrackState_trk2;
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break;
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case wozTrackState_trk2:
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trk &= data;
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wozTrackState = wozTrackState_sec1;
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break;
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case wozTrackState_sec1:
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sec = (data << 1) | 1;
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wozTrackState = wozTrackState_sec2;
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break;
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case wozTrackState_sec2:
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sec &= data;
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wozTrackState = wozTrackState_END;
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// printf("Vol:%d Track:%d Sector:%d at bitOffset:%d\n", vol, trk, sec, bitOffs_D5_SecHdr);
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break;
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default:
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if ( data == 0xD5 ) {
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// printf("D5 at bitOffset:%d\n", bitOffs);
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wozTrackState = wozTrackState_D5;
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bitOffs_D5_SecHdr = bitOffs;
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}
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else {
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wozTrackState = wozTrackState_Start;
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}
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break;
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}
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return wozTrackState;
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}
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void woz_loadTrack( int track ) {
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trackEntry_t reg = {0};
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reg.shift = 0;
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reg.data = 0;
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prepared_track[0] = reg;
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int bitOffs = 0;
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for ( int byteOffs = 0; byteOffs < WOZ1_TRACK_BYTE_COUNT; byteOffs++ ) {
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reg.data = (*woz_trks)[track].data[ byteOffs ];
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for ( int i = 0; i < 8; i++ ) {
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reg.shift16 <<= 1;
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if (reg.shift & 0x80) {
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woz_decodeTrkSec( reg.shift, 0, bitOffs );
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reg.shift = 0;
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}
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bitOffs++;
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}
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}
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}
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uint8_t woz_read() {
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if ( woz_tmap && woz_trks ) {
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int track = woz_tmap->phase[disk.phase.count];
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if (outdev) fprintf(outdev, "track: %d (%d) ", track, disk.phase.count);
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if ( track >= 40 ) {
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dbgPrintf("TRCK TOO HIGH!\n");
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return rand();
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}
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static int clkBeforeSync = 0;
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clkelpased = m6502.clktime + clkfrm - m6502.clklast;
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m6502.clklast = m6502.clktime + clkfrm;
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clkBeforeSync += clkelpased;
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const int clkBeforeAdjusting = 512;
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const int magicShiftOffset = 45;
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uint16_t usedBytes = (*woz_trks)[track].bytes_used < WOZ1_TRACK_BYTE_COUNT ? (*woz_trks)[track].bytes_used : WOZ1_TRACK_BYTE_COUNT;
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if ( usedBytes ) {
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int shiftOffset = magicShiftOffset;
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// printf("elpased : %llu (clkBefRd:%d)\n", clkelpased, clkBeforeSync);
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if ( clkelpased > clkBeforeAdjusting ) {
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// printf("NEED SYNC : %llu (clkBefRd:%d)\n", clkelpased, clkBeforeSync);
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clkBeforeSync = 0;
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bitOffset = (clkelpased >> 2) & 7;
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trackOffset += clkelpased >> 5;
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if ( trackOffset >= usedBytes ) {
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bitOffset = 0;
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trackOffset = 0;
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WOZread.shift = 0;
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shiftOffset = 0;
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}
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// trackOffset %= usedBytes;
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// preroll data stream
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WOZread.shift = 0;
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WOZread.data = (*woz_trks)[track].data[trackOffset++];
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trackOffset %= usedBytes;
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trackWRoffset = trackOffset;
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WOZread.shift <<= bitOffset;
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WOZwrite = WOZread;
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for ( int i = 0; i < shiftOffset; i++ ) {
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for ( ; bitOffset < 8; bitOffset++ ) {
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WOZread.shift <<= 1;
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WOZwrite.shift <<= 1;
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if ( WOZread.valid ) {
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WOZread.latch = 0;
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}
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}
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trackWRoffset = trackOffset;
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WOZwrite.data = WOZread.data = (*woz_trks)[track].data[trackOffset++];
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trackOffset %= usedBytes;
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bitOffset = 0;
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}
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}
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else {
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uint64_t bitForward = (clkelpased >> 2);
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// to avoid infinite loop and to search for bit 7 high
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for ( uint64_t i = 0; i < bitForward; i++ ) {
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if ( ++bitOffset >= 8 ) {
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bitOffset = 0;
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trackWRoffset = trackOffset;
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trackOffset++;
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trackOffset %= usedBytes;
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WOZwrite.data = WOZread.data = (*woz_trks)[track].data[trackOffset];
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}
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WOZread.shift <<= 1;
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WOZwrite.shift <<= 1;
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if ( WOZread.valid ) {
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WOZread.latch = 0;
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}
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}
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}
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// to avoid infinite loop and to search for bit 7 high
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for ( int i = 0; i < usedBytes * 8; i++ ) {
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if ( WOZread.valid ) {
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WOZread.latch = 0;
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// if (outdev) fprintf(outdev, "byte: %02X\n", byte);
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if ( woz_decodeTrkSec(WOZwrite.latch, clkelpased, trackOffset * 8 + bitOffset) == wozTrackState_END ) {
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if (outdev) fprintf(outdev, "vol:%d trk:%d sec:%d\n", vol, trk, sec);
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}
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if (outdev) fprintf(outdev, "elpased:%lld read: %02X\n", clkelpased, WOZwrite.latch);
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return WOZwrite.latch;
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}
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if ( ++bitOffset >= 8 ) {
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bitOffset = 0;
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trackWRoffset = trackOffset;
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trackOffset++;
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trackOffset %= usedBytes;
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WOZwrite.data = WOZread.data = (*woz_trks)[track].data[trackOffset];
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}
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WOZread.shift <<= 1;
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WOZwrite.shift <<= 1;
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}
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// if (outdev) fprintf(outdev, "TIME OUT!\n");
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}
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}
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return rand();
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}
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void printbits ( uint8_t byte ) {
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fprintf(outdev, "%02X:", byte);
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for ( int bit = 7; bit >= 0; bit-- ) {
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fprintf(outdev, "%d", byte & (1 << bit) ? 1 : 0 );
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}
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fprintf(outdev, " ");
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}
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void printWozBuffer (const char * s, int n, WOZread_t WOZbuf ) {
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// for DEBUG ONLY!!!
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if (outdev) {
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fprintf(outdev, "%s (%d) ", s, n);
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for ( int i = 5; i >= 0; i-- ) {
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printbits(WOZbuf.out[i]);
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}
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printbits(WOZbuf.latch);
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printbits(WOZbuf.data);
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fprintf(outdev, "\n");
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}
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}
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void woz_write( uint8_t data ) {
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if ( woz_tmap && woz_trks ) {
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int track = woz_tmap->phase[disk.phase.count];
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if (outdev) fprintf(outdev, "track: %d (%d) ", track, disk.phase.count);
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if ( track >= 40 ) {
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dbgPrintf("TRACK TOO HIGH!\n");
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return;
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}
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woz_flags.disk_modified = 1;
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clkelpased = m6502.clktime + clkfrm - m6502.clklast;
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m6502.clklast = m6502.clktime + clkfrm;
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uint16_t usedBytes = (*woz_trks)[track].bytes_used < WOZ1_TRACK_BYTE_COUNT ? (*woz_trks)[track].bytes_used : WOZ1_TRACK_BYTE_COUNT;
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if ( usedBytes ) {
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// for DEBUG ONLY!!!
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if (outdev) fprintf(outdev, "elpased:%llu data:$%02X\n", clkelpased, data);
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printWozBuffer("*start", 0, WOZwrite);
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if ( clkelpased > 32 ) {
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// if (outdev) fprintf(outdev, "I/O ERROR : %llu\n", clkelpased);
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uint64_t bitForward = (clkelpased - 32) >> 2;
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// simulate disk spin over time
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while ( bitForward-- ) {
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if ( ++bitOffset >= 8 ) {
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bitOffset = 0;
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trackWRoffset = trackOffset;
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trackOffset++;
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trackOffset %= usedBytes;
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// WOZwrite.data =
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WOZread.data = (*woz_trks)[track].data[trackOffset];
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}
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WOZread.shift <<= 1;
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WOZwrite.shift <<= 1;
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if ( WOZread.valid ) {
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WOZread.latch = 0;
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}
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}
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}
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// ok now we can latch data
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WOZwrite.data = WOZread.data = data;
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printWozBuffer("datain", 0, WOZwrite);
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int i = 8; // 8 bit to shift in
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// shift in 8 bits of data and write it out
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while ( i-- ) {
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if ( ++bitOffset >= 8 ) {
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// write out first part
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(*woz_trks)[track].data[trackWRoffset] = WOZwrite.latch;
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bitOffset = 0;
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trackWRoffset = trackOffset;
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trackOffset++;
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trackOffset %= usedBytes;
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// simulate shift in data (path of write latch is already loaded, we should not overwrite it!)
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uint8_t new = (*woz_trks)[track].data[trackOffset];
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new >>= i + 1;
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WOZread.data |= new;
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// WOZwrite.data |= new;
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printWozBuffer("shl1in", i, WOZwrite);
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WOZread.shift <<= 1;
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WOZwrite.shift <<= 1;
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break;
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}
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WOZread.shift <<= 1;
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WOZwrite.shift <<= 1;
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printWozBuffer("shift1", i, WOZwrite);
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};
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printWozBuffer("shift1", 9, WOZwrite);
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// write the remaining bits without altering WOZ track offsets and indexes
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// WOZread_t WOZtmp = WOZwrite;
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// int bo = bitOffset;
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// second half
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while ( i-- ) {
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if ( ++bitOffset >= 8 ) {
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// write out first part
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(*woz_trks)[track].data[trackWRoffset] = WOZwrite.latch;
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break;
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}
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WOZwrite.shift <<= 1;
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printWozBuffer("shift2", i, WOZwrite);
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};
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printWozBuffer("shift2", 9, WOZwrite);
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}
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}
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}
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void woz_free_buffer() {
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if ( woz_file_buffer ) {
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free(woz_file_buffer);
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woz_file_buffer = NULL;
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woz_header = NULL;
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woz_tmap = NULL;
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woz_trks = NULL;
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}
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}
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int woz_parseBuffer() {
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woz_flags.disk_modified = 0;
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woz_flags.disk_write_protected = 0;
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woz_flags.image_file_readonly = 0;
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woz_flags.image_loaded = 1;
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woz_header = (woz_header_t*)woz_file_buffer;
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// to simulate file read
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long bufOffs = 0;
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// if this really a WOZ file?
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switch ( woz_header->magic ) {
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case WOZ1_MAGIC:
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break;
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case WOZ2_MAGIC:
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break;
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default:
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woz_free_buffer();
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return WOZ_ERR_NOT_WOZ_FILE;
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}
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// check if bits and line ends not been altered by data transmission protocols
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if ( woz_header->bit_correctness != 0x0A0D0AFF ) {
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woz_free_buffer();
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return WOZ_ERR_NOT_WOZ_FILE;
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}
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bufOffs += sizeof(woz_header_t);
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while ( bufOffs < woz_file_size ) {
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// beginning of the chunk, so we can skip it later
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woz_chunk_header = (woz_chunk_header_t*) &woz_file_buffer[bufOffs];
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bufOffs += sizeof(woz_chunk_header_t);
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switch ( woz_chunk_header->magic ) {
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case WOZ_INFO_CHUNK_ID:
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break;
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case WOZ_TMAP_CHUNK_ID:
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woz_tmap = (woz_tmap_t*) &woz_file_buffer[bufOffs];
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break;
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case WOZ_TRKS_CHUNK_ID:
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woz_trks = (woz1_trks_t*) &woz_file_buffer[bufOffs];
|
|
break;
|
|
|
|
case WOZ_META_CHUNK_ID:
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
// make sure we are skipping unhandled chunks correctly
|
|
bufOffs += woz_chunk_header->size;
|
|
}
|
|
|
|
// DO NOT COMMIT THIS! ONLY FOR DEBUG!!!
|
|
// woz_loadTrack(0x11);
|
|
|
|
return WOZ_ERR_OK;
|
|
}
|
|
|
|
|
|
int woz_loadFile( const char * filename ) {
|
|
|
|
// char fullpath[256];
|
|
//
|
|
// strcpy(fullpath, resourcePath);
|
|
// strcat(fullpath, "/");
|
|
// strcat(fullpath, filename);
|
|
|
|
FILE * f = fopen(filename, "rb");
|
|
if (f == NULL) {
|
|
perror("Failed to read WOZ: ");
|
|
return WOZ_ERR_FILE_NOT_FOUND;
|
|
}
|
|
|
|
// we eject here so if file not exists, we still have the old disk inserted
|
|
woz_eject();
|
|
|
|
// get file size
|
|
fseek(f, 0, SEEK_END);
|
|
woz_file_size = ftell(f);
|
|
fseek(f, 0, SEEK_SET);
|
|
|
|
woz_file_buffer = malloc(woz_file_size);
|
|
if (woz_file_buffer == NULL) {
|
|
perror("Not Enough Memory: ");
|
|
return WOZ_ERR_BAD_DATA;
|
|
}
|
|
|
|
size_t len = fread( woz_file_buffer, 1, woz_file_size, f);
|
|
fclose(f);
|
|
|
|
if ( len != woz_file_size ) {
|
|
perror("Probably bad WOZ file: ");
|
|
return WOZ_ERR_BAD_DATA;
|
|
}
|
|
|
|
return woz_parseBuffer();
|
|
}
|
|
|
|
|
|
void woz_ask_to_save(void);
|
|
|
|
|
|
void woz_eject() {
|
|
if ( woz_flags.disk_modified ) {
|
|
woz_ask_to_save();
|
|
}
|
|
|
|
woz_flags.disk_modified = 0;
|
|
woz_flags.disk_write_protected = 0;
|
|
woz_flags.image_file_readonly = 0;
|
|
woz_flags.image_loaded = 0;
|
|
|
|
woz_file_size = 0;
|
|
|
|
woz_free_buffer();
|
|
}
|
|
|
|
|
|
int woz_saveFile( const char * filename ) {
|
|
|
|
if ( filename == NULL ) {
|
|
filename = woz_filename;
|
|
}
|
|
|
|
FILE * f = fopen( filename, "wb" );
|
|
if (f == NULL) {
|
|
perror("Failed to crete WOZ: ");
|
|
return WOZ_ERR_FILE_NOT_FOUND;
|
|
}
|
|
|
|
fwrite( woz_file_buffer, woz_file_size, 1, f );
|
|
fclose(f);
|
|
|
|
woz_flags.disk_modified = 0;
|
|
|
|
return WOZ_ERR_OK;
|
|
}
|
|
|
|
|