ICC: Verify curve types have valid types

LutAToBTagData::from_bytes() and LutBToATagData::from_bytes() already
reject curves for which this isn't true with an error.

Ensure potential future callers of the constructors get it right too.

Userland/Libraries/LibGfx/ICC/TagTypes.cpp

@@ -388,6 +388,23 @@ static ErrorOr<Vector<LutCurveType>> read_curves(ReadonlyBytes bytes, u32 offset
     return curves;
 }
 
+static bool is_valid_curve(LutCurveType const& curve)
+{
+    return curve->type() == CurveTagData::Type || curve->type() == ParametricCurveTagData::Type;
+}
+
+bool are_valid_curves(Optional<Vector<LutCurveType>> const& curves)
+{
+    if (!curves.has_value())
+        return true;
+
+    for (auto const& curve : curves.value()) {
+        if (!is_valid_curve(curve))
+            return false;
+    }
+    return true;
+}
+
 ErrorOr<NonnullRefPtr<LutAToBTagData>> LutAToBTagData::from_bytes(ReadonlyBytes bytes, u32 offset, u32 size)
 {
     // ICC v4, 10.12 lutAToBType

Userland/Libraries/LibGfx/ICC/TagTypes.h

@@ -369,6 +369,8 @@ struct CLUTData {
 
 using LutCurveType = NonnullRefPtr<TagData>; // FIXME: Variant<CurveTagData, ParametricCurveTagData> instead?
 
+bool are_valid_curves(Optional<Vector<LutCurveType>> const& curves);
+
 // ICC v4, 10.12 lutAToBType
 class LutAToBTagData : public TagData {
 public:
@@ -394,6 +396,10 @@ public:
         VERIFY(number_of_input_channels == number_of_output_channels || m_clut.has_value());
         VERIFY(m_a_curves.has_value() == m_clut.has_value());
         VERIFY(m_m_curves.has_value() == m_e.has_value());
+
+        VERIFY(are_valid_curves(m_a_curves));
+        VERIFY(are_valid_curves(m_m_curves));
+        VERIFY(are_valid_curves(m_b_curves));
     }
 
     u8 number_of_input_channels() const { return m_number_of_input_channels; }
@@ -448,6 +454,10 @@ public:
         VERIFY(m_e.has_value() == m_m_curves.has_value());
         VERIFY(m_clut.has_value() == m_a_curves.has_value());
         VERIFY(number_of_input_channels == number_of_output_channels || m_clut.has_value());
+
+        VERIFY(are_valid_curves(m_b_curves));
+        VERIFY(are_valid_curves(m_m_curves));
+        VERIFY(are_valid_curves(m_a_curves));
     }
 
     u8 number_of_input_channels() const { return m_number_of_input_channels; }