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engines/glk/scott/disk_image.h

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+/*
+ * https://paradroid.automac.se/diskimage/
+ * Copyright (c) 2003-2006, Per Olofsson
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ * Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer. Redistributions in
+ * binary form must reproduce the above copyright notice, this list of
+ * conditions and the following disclaimer in the documentation and/or
+ * other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+ * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef GLK_SCOTT_DISKIMAGE_H
+#define GLK_SCOTT_DISKIMAGE_H
+
+#include "common/scummsys.h"
+#include "glk/scott/types.h"
+
+namespace Glk {
+namespace Scott {
+
+// constants for the supported disk formats
+#define MAXTRACKS 80
+#define MAXSECTORS 40
+#define D64SIZE 174848
+#define D64ERRSIZE 175531
+#define D71SIZE 349696
+#define D71ERRSIZE 351062
+#define D81SIZE 819200
+#define D81ERRSIZE 822400
+
+enum ImageType {
+	D64 = 1,
+	D71,
+	D81
+};
+
+struct TrackSector {
+	byte _track;
+	byte _sector;
+};
+
+struct DiskImage {
+	char *_filename;
+	int _size;
+	ImageType _type;
+	byte *_image;
+	byte *_errinfo;
+	TrackSector _bam;
+	TrackSector _bam2;
+	TrackSector _dir;
+	int _openfiles;
+	int _blocksfree;
+	int _modified;
+	int _status;
+	int _interleave;
+	TrackSector _statusts;
+};
+
+struct RawDirEntry {
+	TrackSector _nextts;
+	byte _type;
+	TrackSector _startts;
+	byte _rawname[16];
+	TrackSector _relsidets;
+	byte _relrecsize;
+	byte _unused[4];
+	TrackSector _replacetemp;
+	byte _sizelo;
+	byte _sizehi;
+};
+
+struct ImageFile {
+	DiskImage *_diskimage;
+	RawDirEntry *_rawdirentry;
+	char _mode;
+	int _position;
+	TrackSector _ts;
+	TrackSector _nextts;
+	byte *_buffer;
+	int _bufptr;
+	int _buflen;
+	byte _visited[MAXTRACKS][MAXSECTORS];
+};
+
+ImageFile *diOpen(DiskImage *di, byte *rawname, byte type, const char *mode);
+int diRead(ImageFile *imgfile, byte *buffer, int len);
+
+byte *diGetTsAddr(DiskImage *di, TrackSector ts);
+int diGetTsErr(DiskImage *di, TrackSector ts);
+
+int diSectorsPerTrack(ImageType type, int track);
+int diTracks(ImageType type);
+int diGetBlockNum(ImageType type, TrackSector ts);
+
+TrackSector diGetDirTs(DiskImage *di);
+int diTrackBlocksFree(DiskImage *di, int track);
+int diIsTsFree(DiskImage *di, TrackSector ts);
+void diAllocTs(DiskImage *di, TrackSector ts);
+
+int diRawnameFromName(byte *rawname, const char *name);
+
+RawDirEntry *findLargestFileEntry(DiskImage *di);
+DiskImage *diCreateFromData(uint8_t *data, int length);
+
+} // End of namespace Scott
+} // End of namespace Glk
+
+#endif