HDB: Create FileMan as the filesystem for HDB

The exisitng code to read MPC files was moved into FileMan

2 files changed, 195 insertions, 0 deletions

diff --git a/engines/hdb/file-manager.cpp b/engines/hdb/file-manager.cpp
new file mode 100644
index 0000000000..5b3c9963aa
--- /dev/null
+++ b/engines/hdb/file-manager.cpp
@@ -0,0 +1,81 @@
+/* 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 2
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#include "hdb/file-manager.h"
+#include "common/debug.h"
+#include "common/file.h"
+#include "common/error.h"
+
+namespace HDB {
+
+bool FileMan::openMSD(const Common::String &filename) {
+	uint32 offset;
+
+	if (!_msdFile->open(filename)) {
+		error("FileMan::openMSD(): Error reading the MSD file");
+		return false;
+	} else {
+		dataHeader.id[0] = _msdFile->readByte();
+		dataHeader.id[1] = _msdFile->readByte();
+		dataHeader.id[2] = _msdFile->readByte();
+		dataHeader.id[3] = _msdFile->readByte();
+
+		if (!strncmp(dataHeader.id, MSD_IDENT_COMPRESSED, 4)) {
+			_compressed = true;
+			debug("COMPRESSED FILE");
+			return false;
+		} else if (!strncmp(dataHeader.id, MSD_IDENT_UNCOMPRESSED, 4)) {
+			_compressed = false;
+
+			offset = _msdFile->readUint32LE();
+			_msdFile->seek((int32)offset, SEEK_SET);
+
+			// Note: The MPC archive format assumes the offset to be uint32,
+			// but Common::File::seek() takes the offset as int32. 
+
+			dataHeader.dirSize = _msdFile->readUint32LE();
+
+			for (uint32 fileIndex = 0; fileIndex < dataHeader.dirSize; fileIndex++) {
+				MSDEntry* dirEntry = new MSDEntry();
+
+				for (int fileNameIndex = 0; fileNameIndex < 64; fileNameIndex++) {
+					dirEntry->filename[fileNameIndex] = _msdFile->readByte();
+				}
+
+				dirEntry->offset = _msdFile->readUint32LE();
+				dirEntry->length = _msdFile->readUint32LE();
+				dirEntry->ulength = _msdFile->readUint32LE();
+				dirEntry->type = (DataType)_msdFile->readUint32LE();
+
+				_dir.push_back(dirEntry);
+			}
+
+			return true;
+
+		} else {
+			error("Invalid MPC File.");
+			return false;
+		}
+	}
+}
+
+}
\ No newline at end of file
diff --git a/engines/hdb/file-manager.h b/engines/hdb/file-manager.h
new file mode 100644
index 0000000000..b0f9ccc63e
--- /dev/null
+++ b/engines/hdb/file-manager.h
@@ -0,0 +1,114 @@
+/* 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 2
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef HDB_FILE_MANAGER_H
+#define HDB_FILE_MANAGER_H
+
+#include "common/array.h"
+#include "common/file.h"
+#include "common/error.h"
+
+namespace HDB {
+
+// Each entry in a MSD file is of the following types
+
+enum DataType {
+	TYPE_ERROR,
+	TYPE_BINARY,
+	TYPE_TILE32,
+	TYPE_FONT,
+	TYPE_ICON32,
+	TYPE_PIC,
+
+	ENDOFTYPES
+};
+
+struct MSDEntry {
+	char	filename[64];	// filename
+	long	offset;			// offset in MSD file of data
+	long	length;			// compressed length of data
+	long	ulength;		// uncompressed length
+	DataType	type;		// type of data
+};
+
+// data structure for a TILE32
+// the actual 16-bit "565" PocketPC-formatted
+// gfx data follows the structure in the .msd
+// The imagesize will always be 2048 bytes (32*32*2)
+struct Tile32Type {
+	long	flags;			// bit flags
+	char	name[64];		// name of graphic
+};
+
+// data structure for a PIC
+// the actual 16-bit "565" PocketPC-formatted
+// gfx data follows the structure in the .msd
+struct PicType {
+	int		width, height;	// width & height of pic
+	char	name[64];		// name of pic
+};
+
+// data structure for a FONT
+// the actual 16-bit "565" PocketPC-formatted
+// gfx data follows the structure in the .msd
+struct FontType {
+	int		type;		// 0 = mono, 1 = proportional
+	int		numChars;	// how many characters in font
+	int		height;		// height of entire font
+	int		kerning;	// space between chars
+	int		leading;	// space between lines
+};
+
+// each character in a font has width info and
+// an offset from the beginning of the font chunk
+struct CharInfo {
+	short	width;		// in pixels, of the character
+	long	offset;		// from the start of the font charInfo chunk
+};
+
+class FileMan {
+private:
+
+	Common::File* _msdFile;
+	Common::Array<MSDEntry*> _dir;
+	MSDEntry* _dirEntry;
+	int _numEntries;
+	bool _compressed;
+
+public:
+
+	struct {
+		char id[4];
+		unsigned long dirSize;
+	} dataHeader;
+
+	long readOffset;
+	
+	bool openMSD(const Common::String &filename);
+};
+
+#define MSD_IDENT_COMPRESSED "MPCC"
+#define MSD_IDENT_UNCOMPRESSED "MPCU"
+
+} // End of Namespace HDB
+
+#endif // !HDB_FILE_MANAGER_H