Initial commit

engines/nancy/iff.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/memstream.h"
+#include "common/formats/iff_container.h"
+
+#include "engines/nancy/nancy.h"
+#include "engines/nancy/iff.h"
+#include "engines/nancy/resource.h"
+
+namespace Nancy {
+
+IFF::IFF(Common::SeekableReadStream *stream) {
+	// Scan the file for FORM/DATA wrapper chunks. There can be several of these in a single IFF.
+	uint32 dataString = g_nancy->getGameType() == kGameTypeVampire ? ID_FORM : ID_DATA;
+	_stream = stream;
+
+	while (stream->pos() < stream->size() - 3) {
+		_nextDATAChunk = 0;
+		uint32 id = stream->readUint32BE();
+		stream->seek(-4, SEEK_CUR);
+		if (id == dataString) {
+			Common::IFFParser iff(stream, false, dataString);
+			Common::Functor1Mem<Common::IFFChunk &, bool, IFF> c(this, &IFF::callback);
+			iff.parse(c);
+			if (_nextDATAChunk) {
+				stream->seek(_nextDATAChunk);
+			}
+		} else {
+			stream->skip(1);
+		}
+	}
+
+	delete _stream;
+	_stream = nullptr;
+}
+
+IFF::~IFF() {
+	for (uint i = 0; i < _chunks.size(); i++)
+		delete[] _chunks[i].buf;
+}
+
+bool IFF::callback(Common::IFFChunk &c) {
+	Chunk chunk;
+
+	// Replace invalid NULs with spaces
+	char id[4];
+	WRITE_BE_UINT32(id, c._type);
+	for (uint i = 0; i < 4; ++i) {
+		if (id[i] == 0)
+			id[i] = ' ';
+	}
+	chunk.id = READ_BE_UINT32(id);
+
+	if (chunk.id == (g_nancy->getGameType() == kGameTypeVampire ? ID_FORM : ID_DATA)) {
+		// Encountered the next FORM/DATA wrapper. Signal that we need to stop reading the
+		// current one and mark where from the parser should be called next.
+		_nextDATAChunk = _stream->pos() - 8;
+		return true;
+	}
+
+	chunk.size = c._size;
+	chunk.buf = new byte[chunk.size];
+	c._stream->read(chunk.buf, chunk.size);
+
+	if (c._stream->err())
+		error("IFF::callback: error reading '%s' chunk", idToString(chunk.id).c_str());
+
+	debugN(3, "IFF::callback: Adding '%s' chunk\n", idToString(chunk.id).c_str());
+	_chunks.push_back(chunk);
+
+	return false;
+}
+
+const byte *IFF::getChunk(uint32 id, uint &size, uint index) const {
+	uint found = 0;
+	for (uint i = 0; i < _chunks.size(); ++i) {
+		const Chunk &chunk = _chunks[i];
+		if (chunk.id == id) {
+			if (found == index) {
+				size = chunk.size;
+				return chunk.buf;
+			}
+			++found;
+		}
+	}
+
+	return nullptr;
+}
+
+Common::SeekableReadStream *IFF::getChunkStream(const Common::String &id, uint index) const {
+	uint size;
+	const byte *chunk = getChunk(stringToId(id), size, index);
+
+	if (chunk) {
+		byte *dup = (byte *)malloc(size);
+		memcpy(dup, chunk, size);
+		return new Common::MemoryReadStream(dup, size, DisposeAfterUse::YES);
+	}
+
+	return nullptr;
+}
+
+Common::String IFF::idToString(uint32 id) {
+	Common::String s;
+	while (id) {
+		s += id >> 24;
+		id <<= 8;
+	}
+	return s;
+}
+
+uint32 IFF::stringToId(const Common::String &s) {
+	uint32 id = 0;
+
+	for (uint i = 0; i < 4; ++i)
+		id |= (s.size() > i ? s[i] : ' ') << (3 - i) * 8;
+
+	return id;
+}
+
+void IFF::list(Common::Array<Common::String> &nameList) const {
+	Common::String chunkName;
+	nameList.reserve(_chunks.size());
+	for (uint i = 0; i < _chunks.size(); ++i) {
+		chunkName = idToString(_chunks[i].id);
+		chunkName.trim();
+		nameList.push_back(chunkName);
+	}
+}
+
+} // End of namespace Nancy