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engines/dgds/sound/drivers/midipatch.cpp

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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/>.
+ *
+ */
+
+
+#include "common/config-manager.h"
+#include "common/file.h"
+#include "common/memstream.h"
+#include "common/ptr.h"
+
+#include "dgds/sound/resource/sci_resource.h"
+#include "dgds/dgds.h"
+#include "dgds/includes.h"
+
+namespace Dgds {
+
+//
+// Unlike the other files in this directory, this is not part of the SCI
+// engine.  This is a single function to load patch data from the DGDS
+// resource system.
+//
+
+static const char *PATCH_RESOURCES[] = {
+	"SXTITLE.OVL", // dragon
+	"SXCODE1.OVL", // hoc (TODO: when do we load SXCODE2 - maybe when global 0x37 changes)
+	"SX.OVL",      // newer games (beamish, sq5 demo)
+};
+
+SciResource *getMidiPatchData(int num) {
+	assert(num < 999);
+
+	DgdsEngine *engine = DgdsEngine::getInstance();
+	ResourceManager *resource = engine->getResourceManager();
+	Decompressor *decomp = engine->getDecompressor();
+	Common::ScopedPtr<ResourceManager> fddMgr;
+	Common::ScopedPtr<Common::SeekableReadStream> ovlStream;
+
+	int resNum = 0;
+	for (; resNum < ARRAYSIZE(PATCH_RESOURCES); resNum++) {
+		ovlStream.reset(resource->getResource(PATCH_RESOURCES[resNum]));
+		if (ovlStream)
+			break;
+	}
+
+	//
+	// WORKAROUND: The MT-32 patch data in Willy Beamish CD version is corrupted.
+	// If the FDD version is avaialble in the "FDD" directory, use that instead.
+	// This is how the data comes arranged in the GOG version.
+	//
+	if (num == 1 && engine->getGameId() == GID_WILLY) {
+		fddMgr.reset(new ResourceManager("FDD"));
+		if (fddMgr.get()->hasResource("SX.OVL")) {
+			debug("Overriding MT32 patch data with patches from FDD version.");
+			resNum = 2;
+			ovlStream.reset(fddMgr.get()->getResource("SX.OVL"));
+		}
+	}
+
+	if (!ovlStream) {
+		warning("Couldn't load DGDS midi patch data from any known OVL file");
+		return nullptr;
+	}
+
+	DgdsChunkReader chunk(ovlStream.get());
+
+	const Common::String targetSection = Common::String::format("%03d:", num);
+
+	while (chunk.readNextHeader(EX_OVL, PATCH_RESOURCES[resNum])) {
+		if (chunk.isContainer()) {
+			continue;
+		}
+
+		if (chunk.isSection(targetSection)) {
+			chunk.readContent(decomp);
+			Common::SeekableReadStream *stream = chunk.getContent();
+
+			byte magic = stream->readSByte(); // always 137?
+			byte strLen = stream->readSByte(); // header string len
+			char *buf = new char[strLen + 1];
+			stream->read(buf, strLen);
+			buf[strLen] = '\0';
+
+			int dataLen = stream->size() - (strLen + 2);
+			byte *data = new byte[dataLen];
+			debug(1, "midi patch %s loading magic %d str '%s'", targetSection.c_str(), magic, buf);
+			delete [] buf;
+			stream->read(data, dataLen);
+			return new SciResource(data, dataLen, num);
+		} else {
+			chunk.skipContent();
+		}
+	}
+
+	warning("Didn't find section %s in midi patch resource %s", targetSection.c_str(), PATCH_RESOURCES[resNum]);
+
+	return nullptr;
+}
+
+
+} // end namespace Dgds