Initial commit

devtools/create_mm/create_xeen/cc.cpp

@@ -0,0 +1,109 @@
+/* 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/>.
+ *
+ */
+
+ // Disable symbol overrides so that we can use system headers.
+#define FORBIDDEN_SYMBOL_ALLOW_ALL
+
+#include "cc.h"
+#include "common/endian.h"
+
+uint16 CCArchive::convertNameToId(const Common::String &resourceName) {
+	if (resourceName.empty())
+		return 0xffff;
+
+	Common::String name = resourceName;
+	name.toUppercase();
+
+	// Check if a resource number is being directly specified
+	if (name.size() == 4) {
+		char *endPtr;
+		uint16 num = (uint16)strtol(name.c_str(), &endPtr, 16);
+		if (!*endPtr)
+			return num;
+	}
+
+	const byte *msgP = (const byte *)name.c_str();
+	int total = *msgP++;
+	for (; *msgP; total += *msgP++) {
+		// Rotate the bits in 'total' right 7 places
+		total = (total & 0x007F) << 9 | (total & 0xFF80) >> 7;
+	}
+
+	return total;
+}
+
+void CCArchive::loadIndex() {
+	int count = _file.readUint16LE();
+	long size = count * 8;
+
+	// Read in the data for the archive's index
+	byte *rawIndex = new byte[size];
+
+	if (_file.read(rawIndex, size) != size) {
+		delete[] rawIndex;
+		error("Failed to read %ld bytes from CC archive", size);
+	}
+
+	// Decrypt the index
+	int seed = 0xac;
+	for (int i = 0; i < count * 8; ++i, seed += 0x67) {
+		rawIndex[i] = (byte)((((rawIndex[i] << 2) | (rawIndex[i] >> 6)) + seed) & 0xff);
+	}
+
+	// Extract the index data into entry structures
+	_index.resize(count);
+	const byte *entryP = &rawIndex[0];
+	for (int idx = 0; idx < count; ++idx, entryP += 8) {
+		CCEntry &entry = _index[idx];
+		entry._id = READ_LE_UINT16(entryP);
+		entry._offset = READ_LE_UINT32(entryP + 2) & 0xffffff;
+		entry._size = READ_LE_UINT16(entryP + 5);
+		assert(!entryP[7]);
+	}
+
+	delete[] rawIndex;
+}
+
+void CCArchive::close() {
+}
+
+Common::MemFile CCArchive::getMember(const Common::String &name) {
+	uint16 id = convertNameToId(name);
+
+	for (uint idx = 0; idx < _index.size(); ++idx) {
+		CCEntry &entry = _index[idx];
+		if (entry._id == id) {
+			if (_file.seek(entry._offset) != 0)
+				error("Failed to seek to %d for CC archive", entry._offset);
+
+			if (_file.read(entry._data, entry._size) != entry._size)
+				error("Failed to read %hu bytes from CC archive", entry._size);
+
+			// Decrypt the entry
+			for (int i = 0; i < entry._size; ++i)
+				entry._data[i] ^= 0x35;
+
+			return Common::MemFile(entry._data, entry._size);
+		}
+	}
+
+	error("Failed to find %s", name.c_str());
+}