From 8ab1846f59504dc7edd8d26b7702d520e3bab631 Mon Sep 17 00:00:00 2001
From: Filippos Karapetis
Date: Tue, 20 Sep 2016 10:50:59 +0300
Subject: CHEWY: Add support for SFX and speech resources to the resource
 manager

---
 engines/chewy/resource.cpp | 130 +++++++++++++++++++++++++++++++++------------
 1 file changed, 95 insertions(+), 35 deletions(-)

(limited to 'engines/chewy/resource.cpp')

diff --git a/engines/chewy/resource.cpp b/engines/chewy/resource.cpp
index 40db53abe6..233e8cd4f4 100644
--- a/engines/chewy/resource.cpp
+++ b/engines/chewy/resource.cpp
@@ -34,64 +34,124 @@ Resource::Resource(Common::String filename) {
 	uint32 magicBytes = MKTAG('N', 'G', 'S', '\0');
 	if (_stream.readUint32BE() != magicBytes)
 		error("Invalid resource - %s", filename.c_str());
-	_stream.skip(2);	// type
+	_resType = (ResourceType)_stream.readUint16LE();
 	_chunkCount = _stream.readUint16LE();
 
-	uint32 tbfID = MKTAG('T', 'B', 'F', '\0');
-
 	for (uint i = 0; i < _chunkCount; i++) {
-		TBFChunk cur;
-		cur.packedSize = _stream.readUint32LE() - TBF_CHUNK_HEADER_SIZE;
-		cur.type = _stream.readUint16LE();
-		if (_stream.readUint32BE() != tbfID)
-			error("Corrupt resource %s", filename.c_str());
-
-		cur.screenMode = _stream.readUint16LE();
-		cur.compressionFlag = _stream.readUint16LE();
-		cur.unpackedSize = _stream.readUint32LE();
-		cur.width = _stream.readUint16LE();
-		cur.height = _stream.readUint16LE();
-		for (int j = 0; j < 3 * 256; j++)
-			cur.palette[j] = _stream.readByte() << 2;
+		Chunk cur;
+		cur.size = _stream.readUint32LE();
+		cur.type = (ResourceType)_stream.readUint16LE();
 		cur.pos = _stream.pos();
 
-		_stream.skip(cur.packedSize);
+		if (cur.type == kResourceTBF) {
+			cur.pos += TBF_CHUNK_HEADER_SIZE;
+			cur.size -= TBF_CHUNK_HEADER_SIZE;
+			readTBFChunk();
+		}
 
-		_tbfChunkList.push_back(cur);
+		_stream.skip(cur.size);
+		_chunkList.push_back(cur);
 	}
-
 }
 
 Resource::~Resource() {
+	_chunkList.clear();
 	_tbfChunkList.clear();
 	_stream.close();
 }
 
-TBFChunk *Resource::getChunk(int num) {
+void Resource::readTBFChunk() {
+	TBFChunk cur;
+	if (_stream.readUint32BE() != MKTAG('T', 'B', 'F', '\0'))
+		error("Corrupt TBF resource");
+
+	cur.screenMode = _stream.readUint16LE();
+	cur.compressionFlag = _stream.readUint16LE();
+	cur.unpackedSize = _stream.readUint32LE();
+	cur.width = _stream.readUint16LE();
+	cur.height = _stream.readUint16LE();
+	for (int j = 0; j < 3 * 256; j++)
+		cur.palette[j] = _stream.readByte() << 2;
+
+	_tbfChunkList.push_back(cur);
+}
+
+uint32 Resource::getChunkCount() const {
+	return _chunkList.size();
+}
+
+Chunk *Resource::getChunk(int num) {
+	return &_chunkList[num];
+}
+
+TBFChunk *Resource::getTBFChunk(int num) {
+	assert(_resType == kResourceTGP);
 	return &_tbfChunkList[num];
 }
 
 byte *Resource::getChunkData(int num) {
-	TBFChunk *chunk = &_tbfChunkList[num];
-	byte *data = new byte[chunk->unpackedSize];
+	Chunk *chunk = &_chunkList[num];
+	byte *data;
 
 	_stream.seek(chunk->pos, SEEK_SET);
 
-	if (!chunk->compressionFlag) {
-		_stream.read(data, chunk->packedSize);
-	} else {
-		// Compressed resources are packed using a very simple RLE compression
-		byte count;
-		byte value;
-		uint32 outPos = 0;
-
-		for (uint i = 0; i < (chunk->packedSize) / 2 && outPos < chunk->unpackedSize; i++) {
-			count = _stream.readByte();
-			value = _stream.readByte();
-			for (byte j = 0; j < count; j++) {
-				data[outPos++] = value;
+	if (chunk->type == kResourceTBF) {
+		TBFChunk *tbfChunk = &_tbfChunkList[num];
+		data = new byte[tbfChunk->unpackedSize];
+
+		if (!tbfChunk->compressionFlag) {
+			_stream.read(data, chunk->size);
+		} else {
+			// Compressed images are packed using a very simple RLE compression
+			byte count;
+			byte value;
+			uint32 outPos = 0;
+
+			for (uint i = 0; i < (chunk->size) / 2 && outPos < tbfChunk->unpackedSize; i++) {
+				count = _stream.readByte();
+				value = _stream.readByte();
+				for (byte j = 0; j < count; j++) {
+					data[outPos++] = value;
+				}
 			}
 		}
+	} else if (chunk->type == kResourceVOC) {
+		// Voice files are split in blocks, so reassemble them here
+		byte blocksRemaining;
+		uint32 totalLength = 0;
+		uint32 blockSize;
+		
+		// Find the total length of the voice file
+		do {
+			blocksRemaining = _stream.readByte();
+			blockSize =
+				_stream.readByte() +
+				(_stream.readByte() << 8) +
+				(_stream.readByte() << 16);
+
+			totalLength += blockSize;
+			_stream.skip(blockSize);
+		} while (blocksRemaining > 1);
+
+		// Read the voice data
+		data = new byte[totalLength];
+		byte *ptr = data;
+
+		_stream.seek(chunk->pos, SEEK_SET);
+
+		do {
+			blocksRemaining = _stream.readByte();
+			blockSize =
+				 _stream.readByte() +
+				(_stream.readByte() << 8) +
+				(_stream.readByte() << 16);
+			
+			_stream.read(ptr, blockSize);
+			ptr += blockSize;
+		} while (blocksRemaining > 1);
+	} else {
+		data = new byte[chunk->size];
+		_stream.read(data, chunk->size);
 	}
 
 	return data;
-- 
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