From 452d46b3bf6a3c77bc4583a56e7dc5e7a4ad385b Mon Sep 17 00:00:00 2001
From: Eugene Sandulenko <sev@scummvm.org>
Date: Sun, 1 Jun 2008 21:10:29 +0000
Subject: [PATCH] Implement file fallback for archives

svn-id: r32476
---
 common/unarj.cpp | 17 ++++++++++++++++-
 common/unarj.h   |  6 +++++-
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/common/unarj.cpp b/common/unarj.cpp
index 58f326c1ac7..57673341f7a 100644
--- a/common/unarj.cpp
+++ b/common/unarj.cpp
@@ -78,6 +78,7 @@ static uint32 GetCRC(byte *data, int len) {
 ArjFile::ArjFile() {
 	InitCRC();
 	_isOpen = false;
+	_fallBack = false;
 }
 
 ArjFile::~ArjFile() {
@@ -234,6 +235,15 @@ bool ArjFile::open(const Common::String &filename, AccessMode mode) {
 
 	_isOpen = false;
 
+	if (_fallBack) {
+		_currArchive.open(filename);
+		if (_currArchive.isOpen()) {
+			_isOpen = true;
+			_uncompressed = &_currArchive;
+			return true;
+		}
+	}
+
 	if (!_fileMap.contains(filename))
 		return false;
 
@@ -279,7 +289,12 @@ bool ArjFile::open(const Common::String &filename, AccessMode mode) {
 void ArjFile::close() {
 	_isOpen = false;
 
-	delete _uncompressed;
+	if (_fallBack) {
+		_currArchive.close();
+	} else {
+		delete _uncompressed;
+	}
+
 	_uncompressed = NULL;
 
 	free(_uncompressedData);
diff --git a/common/unarj.h b/common/unarj.h
index 289ab52ad04..b015999671f 100644
--- a/common/unarj.h
+++ b/common/unarj.h
@@ -106,6 +106,8 @@ public:
 	ArjFile();
 	~ArjFile();
 
+	void enableFallback(bool val) { _fallBack = val; }
+
 	void registerArchive(const String &filename);
 
 	bool open(const Common::String &filename, AccessMode mode = kFileReadMode);
@@ -119,6 +121,8 @@ public:
 	bool isOpen() { return _isOpen; }
 
 private:
+	bool _fallBack;
+
 	File _currArchive;
 	Array<ArjHeader *> _headers;
 	ArjFilesMap _fileMap;
@@ -128,7 +132,7 @@ private:
 	byte *_compressedData;
 	MemoryWriteStream *_outstream;
 	MemoryReadStream *_compressed;
-	MemoryReadStream *_uncompressed;
+	SeekableReadStream *_uncompressed;
 
 	bool _isOpen;