Avoid creating lots of file handles, reuse them instead (this relies on files being accessed from a single thread)

svn-id: r18468

3 files changed, 47 insertions, 21 deletions

diff --git a/scumm/smush/chunk.cpp b/scumm/smush/chunk.cpp
index b2c2b0aeab..888e0f9fce 100644
--- a/scumm/smush/chunk.cpp
+++ b/scumm/smush/chunk.cpp
@@ -85,34 +85,50 @@ bool BaseChunk::seek(int32 delta, seek_type dir) {
 	return true;
 }
 
-FileChunk::FileChunk(const Common::String &name, int offset) 
-	: _name(name) {
-	if (!g_scumm->openFile(_data, name.c_str()))
+FileChunk::FileChunk(ScummFile *data, int offset) {
+	_data = data;
+	_deleteData = false;
+
+	_data->seek(offset, seek_start);
+	_type = _data->readUint32BE();
+	_size = _data->readUint32BE();
+	_offset = _data->pos();
+	_curPos = 0;
+}
+
+FileChunk::FileChunk(const Common::String &name, int offset) {
+	_data = new ScummFile();
+	_deleteData = true;
+	if (!g_scumm->openFile(*_data, name.c_str()))
 		error("FileChunk: Unable to open file %s", name.c_str());
 
-	_data.seek(offset);
-	_type = _data.readUint32BE();
-	_size = _data.readUint32BE();
-	_offset = _data.pos();
+	_data->seek(offset, seek_start);
+	_type = _data->readUint32BE();
+	_size = _data->readUint32BE();
+	_offset = _data->pos();
 	_curPos = 0;
 }
 
 FileChunk::~FileChunk() {
+	if (_deleteData)
+		delete _data;
 }
 
 Chunk *FileChunk::subBlock() {
-	FileChunk *ptr = new FileChunk(_name, _offset + _curPos);
-	_data.seek(_offset + _curPos + sizeof(Chunk::type) + sizeof(uint32));
+	FileChunk *ptr = new FileChunk(_data, _offset + _curPos);
 	seek(sizeof(Chunk::type) + sizeof(uint32) + ptr->getSize());
 	return ptr;
 }
 
+void FileChunk::reseek() {
+	_data->seek(_offset + _curPos);
+}
+
 bool FileChunk::read(void *buffer, uint32 size) {
 	if (size <= 0 || (_curPos + size) > _size)
 		error("invalid buffer read request");
 
-//	_data.seek(_offset + _curPos);
-	_data.read(buffer, size);
+	_data->read(buffer, size);
 	_curPos += size;
 	return true;
 }
@@ -122,13 +138,12 @@ int8 FileChunk::getChar() {
 }
 
 byte FileChunk::getByte() {
-//	_data.seek(_offset + _curPos);
 	_curPos++;
 
 	if (_curPos > _size)
 		error("invalid byte read request");
 
-	return _data.readByte();
+	return _data->readByte();
 }
 
 int16 FileChunk::getShort() {
@@ -136,23 +151,21 @@ int16 FileChunk::getShort() {
 }
 
 uint16 FileChunk::getWord() {
-//	_data.seek(_offset + _curPos);
 	_curPos += 2;
 
 	if (_curPos > _size)
 		error("invalid word read request");
 
-	return _data.readUint16LE();
+	return _data->readUint16LE();
 }
 
 uint32 FileChunk::getDword() {
-//	_data.seek(_offset + _curPos);
 	_curPos += 4;
 
 	if (_curPos > _size)
 		error("invalid dword read request");
 
-	return _data.readUint32LE();
+	return _data->readUint32LE();
 }
 
 MemoryChunk::MemoryChunk(byte *data) {
@@ -171,6 +184,9 @@ Chunk *MemoryChunk::subBlock() {
 	return ptr;
 }
 
+void MemoryChunk::reseek() {
+}
+
 bool MemoryChunk::read(void *buffer, uint32 size) {
 	if (size <= 0 || (_curPos + size) > _size)
 		error("invalid buffer read request");
diff --git a/scumm/smush/chunk.h b/scumm/smush/chunk.h
index f16fe22d28..ee967e21cf 100644
--- a/scumm/smush/chunk.h
+++ b/scumm/smush/chunk.h
@@ -39,6 +39,7 @@ public:
 	virtual type getType() const = 0;
 	virtual uint32 getSize() const = 0;
 	virtual Chunk *subBlock() = 0;
+	virtual void reseek() = 0;
 	virtual bool eof() const = 0;
 	virtual uint32 tell() const = 0;
 	virtual bool seek(int32 delta, seek_type dir = seek_cur) = 0;
@@ -47,7 +48,7 @@ public:
 	virtual byte getByte() = 0;
 	virtual int16 getShort() = 0;
 	virtual uint16 getWord() = 0;
-	virtual uint32 getDword()= 0;
+	virtual uint32 getDword() = 0;
 };
 
 // Common functionality for concrete chunks (FileChunk, MemoryChunk)
@@ -69,14 +70,16 @@ public:
 
 class FileChunk : public BaseChunk {
 private:
-	Common::String _name;
-	ScummFile _data;
+	ScummFile *_data;
+	bool _deleteData;
 	uint32 _offset;
 
+	FileChunk(ScummFile *data, int offset);
 public:
 	FileChunk(const Common::String &name, int offset = 0);
 	virtual ~FileChunk();
 	Chunk *subBlock();
+	void reseek();
 	bool read(void *buffer, uint32 size);
 	int8 getChar();
 	byte getByte();
@@ -92,6 +95,7 @@ private:
 public:
 	MemoryChunk(byte *data);
 	Chunk *subBlock();
+	void reseek();
 	bool read(void *buffer, uint32 size);
 	int8 getChar();
 	byte getByte();
diff --git a/scumm/smush/smush_player.cpp b/scumm/smush/smush_player.cpp
index 62879b4e19..4da332f2fb 100644
--- a/scumm/smush/smush_player.cpp
+++ b/scumm/smush/smush_player.cpp
@@ -892,7 +892,6 @@ void SmushPlayer::handleFrame(Chunk &b) {
 
 	while (!b.eof()) {
 		Chunk *sub = b.subBlock();
-		if (sub->getSize() & 1) b.seek(1);
 		switch (sub->getType()) {
 		case TYPE_NPAL:
 			handleNewPalette(*sub);
@@ -942,6 +941,11 @@ void SmushPlayer::handleFrame(Chunk &b) {
 		default:
 			error("Unknown frame subChunk found : %s, %d", Chunk::ChunkString(sub->getType()), sub->getSize());
 		}
+
+		b.reseek();
+		if (sub->getSize() & 1)
+			b.seek(1);
+
 		delete sub;
 	}
 
@@ -1085,6 +1089,8 @@ void SmushPlayer::parseNextFrame() {
 	}
 	delete sub;
 
+	_base->reseek();
+
 	if (_insanity)
 		_vm->_sound->processSound();