From fc582c0e5975b0591268694fd02430504242b4a2 Mon Sep 17 00:00:00 2001
From: Walter van Niftrik
Date: Wed, 6 Jan 2010 20:22:00 +0000
Subject: SCI: Fix overflow in LZS decompressor

svn-id: r47090
---
 engines/sci/decompressor.cpp | 10 ++++++----
 engines/sci/decompressor.h   |  4 ++--
 2 files changed, 8 insertions(+), 6 deletions(-)

(limited to 'engines')

diff --git a/engines/sci/decompressor.cpp b/engines/sci/decompressor.cpp
index c213fca1ed..7d5064fca2 100644
--- a/engines/sci/decompressor.cpp
+++ b/engines/sci/decompressor.cpp
@@ -901,7 +901,8 @@ int DecompressorLZS::unpack(Common::ReadStream *src, byte *dest, uint32 nPacked,
 }
 
 int DecompressorLZS::unpackLZS() {
-	uint16 offs = 0, clen;
+	uint16 offs = 0;
+	uint32 clen;
 
 	while (!isFinished()) {
 		if (getBitsMSB(1)) { // Compressed bytes follow
@@ -928,8 +929,9 @@ int DecompressorLZS::unpackLZS() {
 	return _dwWrote == _szUnpacked ? 0 : SCI_ERROR_DECOMPRESSION_ERROR;
 }
 
-uint16 DecompressorLZS::getCompLen() {
-	int clen, nibble;
+uint32 DecompressorLZS::getCompLen() {
+	uint32 clen;
+	int nibble;
 	// The most probable cases are hardcoded
 	switch (getBitsMSB(2)) {
 	case 0:
@@ -958,7 +960,7 @@ uint16 DecompressorLZS::getCompLen() {
 	}
 }
 
-void DecompressorLZS::copyComp(int offs, int clen) {
+void DecompressorLZS::copyComp(int offs, uint32 clen) {
 	int hpos = _dwWrote - offs;
 
 	while (clen--)
diff --git a/engines/sci/decompressor.h b/engines/sci/decompressor.h
index b49452ebc3..ed363621e8 100644
--- a/engines/sci/decompressor.h
+++ b/engines/sci/decompressor.h
@@ -192,8 +192,8 @@ public:
 	int unpack(Common::ReadStream *src, byte *dest, uint32 nPacked, uint32 nUnpacked);
 protected:
 	int unpackLZS();
-	uint16 getCompLen();
-	void copyComp(int offs, int clen);
+	uint32 getCompLen();
+	void copyComp(int offs, uint32 clen);
 };
 #endif
 
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