From d680b0b02983350c16e106c50aea152eefc6b585 Mon Sep 17 00:00:00 2001
From: Paul Gilbert
Date: Thu, 1 Aug 2019 19:48:04 -0700
Subject: GLK: Added Blorb mapping to the optional adaptive palette list

---
 engines/glk/blorb.cpp | 29 ++++++++++++++++++++++++++++-
 engines/glk/blorb.h   |  1 +
 2 files changed, 29 insertions(+), 1 deletion(-)

(limited to 'engines/glk')

diff --git a/engines/glk/blorb.cpp b/engines/glk/blorb.cpp
index 849e6866e0..b97ee319c7 100644
--- a/engines/glk/blorb.cpp
+++ b/engines/glk/blorb.cpp
@@ -162,6 +162,27 @@ Common::ErrorCode Blorb::load() {
 		}
 	}
 
+	// Check through any optional remaining chunks for an adaptive palette list
+	while (f.pos() < f.size()) {
+		uint chunkId = f.readUint32BE();
+		uint chunkSize = f.readUint32BE();
+
+		if (chunkId == ID_APal) {
+			// Found one, so create an entry so it can be opened as file named "apal"
+			ChunkEntry ce;
+			ce._filename = "apal";
+			ce._offset = f.pos();
+			ce._size = chunkSize;
+			ce._type = ID_APal;
+			_chunks.push_back(ce);
+			break;
+		}
+
+		if (chunkSize & 1)
+			++chunkSize;
+		f.skip(chunkSize);
+	}
+
 	return Common::kNoError;
 }
 
@@ -169,8 +190,9 @@ bool Blorb::readRIdx(Common::SeekableReadStream &stream, Common::Array<ChunkEntr
 	if (stream.readUint32BE() != ID_RIdx)
 		return false;
 
-	stream.readUint32BE();
+	uint chunkLen = stream.readUint32BE();
 	uint count = stream.readUint32BE();
+	assert(count == (chunkLen - 4) / 12);
 
 	// First read in the resource index
 	for (uint idx = 0; idx < count; ++idx) {
@@ -182,6 +204,9 @@ bool Blorb::readRIdx(Common::SeekableReadStream &stream, Common::Array<ChunkEntr
 		chunks.push_back(ce);
 	}
 
+	// Temporarily store the start of the next chunk of the file (if any)
+	size_t nextChunkOffset = stream.pos();
+
 	// Further iterate through the resources
 	for (uint idx = 0; idx < chunks.size(); ++idx) {
 		ChunkEntry &ce = chunks[idx];
@@ -192,6 +217,8 @@ bool Blorb::readRIdx(Common::SeekableReadStream &stream, Common::Array<ChunkEntr
 		ce._size = stream.readUint32BE();
 	}
 
+	// Reset back to the next chunk, and return that the index was successfully read
+	stream.seek(nextChunkOffset);
 	return true;
 }
 
diff --git a/engines/glk/blorb.h b/engines/glk/blorb.h
index 5d72e2cf06..6076428449 100644
--- a/engines/glk/blorb.h
+++ b/engines/glk/blorb.h
@@ -46,6 +46,7 @@ enum {
 	ID_FORM = MKTAG('F', 'O', 'R', 'M'),
 	ID_IFRS = MKTAG('I', 'F', 'R', 'S'),
 	ID_RIdx = MKTAG('R', 'I', 'd', 'x'),
+	ID_APal = MKTAG('A', 'P', 'a', 'l'),
 
 	ID_Snd = MKTAG('S', 'n', 'd', ' '),
 	ID_Exec = MKTAG('E', 'x', 'e', 'c'),
-- 
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