Fix reading broken DC6 again

See 811c452 for more details

Ref #158

Author: DarthGandalf

src/Abyss/DataTypes/DC6.cpp

@@ -82,6 +82,9 @@ void DC6::setPalette(const Palette &palette) {
 
         const auto &frameData = frame.getFrameData();
         while (process) {
+            if (offset >= frameData.size()) {
+                throw std::runtime_error("Data overrun while decoding DC6 frame.");
+            }
             const auto b = frameData[offset];
             offset++;
 
@@ -102,6 +105,9 @@ void DC6::setPalette(const Palette &palette) {
             }
             case eScanlineType::RunOfOpaquePixels: {
                 for (auto i = 0; i < static_cast<int>(b); i++) {
+                    if (offset >= frameData.size()) {
+                        throw std::runtime_error("Data overrun while decoding DC6 frame.");
+                    }
                     const auto paletteIndex = static_cast<int>(frameData[offset]);
                     const auto &paletteColor = palette.getEntries()[paletteIndex];
                     const auto pixel = static_cast<uint32_t>(paletteColor.getBlue() << 24 | paletteColor.getGreen() << 16 | paletteColor.getRed() << 8 | 0xFF);

src/Abyss/DataTypes/DC6Frame.cpp

@@ -14,11 +14,8 @@ DC6Frame::DC6Frame(Streams::StreamReader &stream) {
   _nextBlock = stream.readUInt32();
   _length = stream.readUInt32();
 
-    _frameData.resize(_length);
-    stream.readBytes(_frameData);
-
-    _terminator.resize(DC6TerminatorSize);
-    stream.readBytes(_terminator);
+  _frameData.resize(_length + DC6TerminatorSize);
+  stream.readBytes(_frameData);
 }
 
 uint32_t DC6Frame::getFlipped() const { return _flipped; }
@@ -39,6 +36,4 @@ uint32_t DC6Frame::getLength() const { return _length; }
 
 const std::vector<std::byte>& DC6Frame::getFrameData() const { return _frameData; }
 
-const std::vector<std::byte>& DC6Frame::getTerminator() const { return _terminator; }
-
 } // namespace Abyss::DataTypes

src/Abyss/DataTypes/DC6Frame.h

@@ -22,7 +22,6 @@ class DC6Frame {
     uint32_t _nextBlock{};
     uint32_t _length{};
     std::vector<std::byte> _frameData{};
-    std::vector<std::byte> _terminator{};
 
   public:
     explicit DC6Frame(Streams::StreamReader& stream);
@@ -35,7 +34,6 @@ class DC6Frame {
     [[nodiscard]] uint32_t getNextBlock() const;
     [[nodiscard]] uint32_t getLength() const;
     [[nodiscard]] const std::vector<std::byte>& getFrameData() const;
-    [[nodiscard]] const std::vector<std::byte>& getTerminator() const;
 };
 
 } // namespace Abyss::DataTypes