From cec2799c64d996dba247669c6eedfbffacc5f384 Mon Sep 17 00:00:00 2001
From: Filippos Karapetis
Date: Mon, 3 Oct 2016 05:29:58 +0300
Subject: CHEWY: Properly handle the text encryption in atds.tap (game texts)

---
 engines/chewy/resource.cpp | 31 +++++++++++++++++++------------
 1 file changed, 19 insertions(+), 12 deletions(-)

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

diff --git a/engines/chewy/resource.cpp b/engines/chewy/resource.cpp
index 90849cd555..352e2f11d7 100644
--- a/engines/chewy/resource.cpp
+++ b/engines/chewy/resource.cpp
@@ -41,9 +41,9 @@ namespace Chewy {
 // misc/inventar.iib
 // misc/inventar.sib
 // room/test.rdi
-// txt/*.tap
+// txt/atds.tap (game texts)
 // txt/diah.adh
-// txt/inv_st.s and txt/room_st.s
+// txt/inv_st.s and txt/room_st.s (inventory/room control bytes)
 // txt/inv_use.idx
 
 Resource::Resource(Common::String filename) {
@@ -52,6 +52,7 @@ Resource::Resource(Common::String filename) {
 	const uint32 headerTxtEnc  = MKTAG('T', 'C', 'F', '\1');
 	const uint32 headerSprite  = MKTAG('T', 'A', 'F', '\0');
 
+	filename.toLowercase();
 	_stream.open(filename);
 
 	uint32 header = _stream.readUint32BE();
@@ -72,6 +73,9 @@ Resource::Resource(Common::String filename) {
 		_encrypted = false;
 	}
 
+	if (filename == "atds.tap")
+		_encrypted = true;
+
 	_chunkCount = _stream.readUint16LE();
 
 	for (uint i = 0; i < _chunkCount; i++) {
@@ -113,6 +117,8 @@ byte *Resource::getChunkData(uint num) {
 
 	_stream.seek(chunk->pos, SEEK_SET);
 	_stream.read(data, chunk->size);
+	if (_encrypted)
+		decrypt(data, chunk->size);
 
 	return data;
 }
@@ -170,6 +176,15 @@ void Resource::unpackRLE(byte *buffer, uint32 compressedSize, uint32 uncompresse
 	}
 }
 
+void Resource::decrypt(byte *data, uint32 size) {
+	byte *c = data;
+
+	for (uint i = 0; i < size; i++) {
+		*c = -(*c);
+		++c;
+	}
+}
+
 TAFChunk *SpriteResource::getSprite(uint num) {
 	assert(num < _chunkList.size());
 
@@ -276,17 +291,9 @@ Common::String ErrorMessage::getErrorMessage(uint num) {
 	byte *data = new byte[chunk->size];
 
 	_stream.seek(chunk->pos, SEEK_SET);
-
 	_stream.read(data, chunk->size);
-
-	if (_encrypted) {
-		byte *c = data;
-
-		for (uint i = 0; i < chunk->size; i++) {
-			*c = -(*c);
-			++c;
-		}
-	}
+	if (_encrypted)
+		decrypt(data, chunk->size);
 
 	str = (char *)data;
 	delete[] data;
-- 
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