From 199ab46f0ce0e0de774c470d2a47072320922d54 Mon Sep 17 00:00:00 2001
From: Alexander Luzgarev <mahalex@gmail.com>
Date: Sat, 16 Mar 2019 14:42:08 +0100
Subject: [PATCH] Support global variables

---
 MatFileHandler.Tests/MatFileReaderHdfTests.cs |  11 ++++++++
 MatFileHandler.Tests/test-data/hdf/global.mat | Bin 0 -> 1936 bytes
 MatFileHandler/HdfFileReader.cs               |  24 ++++++++++++++++--
 3 files changed, 33 insertions(+), 2 deletions(-)
 create mode 100644 MatFileHandler.Tests/test-data/hdf/global.mat

diff --git a/MatFileHandler.Tests/MatFileReaderHdfTests.cs b/MatFileHandler.Tests/MatFileReaderHdfTests.cs
index d182732..6e0a81a 100644
--- a/MatFileHandler.Tests/MatFileReaderHdfTests.cs
+++ b/MatFileHandler.Tests/MatFileReaderHdfTests.cs
@@ -277,6 +277,17 @@ namespace MatFileHandler.Tests
             Assert.That(sparseArray[1, 2], Is.True);
         }
 
+        /// <summary>
+        /// Test reading a global variable.
+        /// </summary>
+        [Test]
+        public void TestGlobal()
+        {
+            var matFile = ReadHdfTestFile("global");
+            var variable = matFile.Variables.First();
+            Assert.That(variable.IsGlobal, Is.True);
+        }
+
         private static void CheckComplexLimits<T>(IArrayOf<ComplexOf<T>> array, T[] limits)
             where T : struct
         {
diff --git a/MatFileHandler.Tests/test-data/hdf/global.mat b/MatFileHandler.Tests/test-data/hdf/global.mat
new file mode 100644
index 0000000000000000000000000000000000000000..1bb2e45b8bd24e924956581a3d2b22be182fb5c4
GIT binary patch
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dk*inv3VAM<R^z0~Pr8f(Kvf9oUVML8fp<ACU5Eex

literal 0
HcmV?d00001

diff --git a/MatFileHandler/HdfFileReader.cs b/MatFileHandler/HdfFileReader.cs
index f2fb596..50565fd 100644
--- a/MatFileHandler/HdfFileReader.cs
+++ b/MatFileHandler/HdfFileReader.cs
@@ -43,6 +43,24 @@ namespace MatFileHandler
             return new MatFile(variables);
         }
 
+        private bool ReadGlobalFlag(long datasetId)
+        {
+            if (H5A.exists_by_name(datasetId, ".", "MATLAB_global") != 0)
+            {
+                using (var globalAttribute = new Attribute(datasetId, "MATLAB_global"))
+                {
+                    using (var h = new MemoryHandle(sizeof(int)))
+                    {
+                        H5A.read(globalAttribute.Id, H5T.NATIVE_INT, h.Handle);
+                        var result = Marshal.ReadInt32(h.Handle);
+                        return result != 0;
+                    }
+                }
+            }
+
+            return false;
+        }
+
         private int VariableIterator(long group, IntPtr name, ref H5L.info_t info, IntPtr op_data)
         {
             var variableName = Marshal.PtrToStringAnsi(name);
@@ -53,8 +71,9 @@ namespace MatFileHandler
                 case H5O.type_t.DATASET:
                     using (var dataset = new Dataset(group, variableName))
                     {
+                        var isGlobal = ReadGlobalFlag(dataset.Id);
                         var value = ReadDataset(dataset.Id);
-                        variables.Add(new MatVariable(value, variableName, false));
+                        variables.Add(new MatVariable(value, variableName, isGlobal));
                     }
                     break;
                 case H5O.type_t.GROUP:
@@ -64,8 +83,9 @@ namespace MatFileHandler
                     }
                     using (var subGroup = new Group(group, variableName))
                     {
+                        var isGlobal = ReadGlobalFlag(subGroup.Id);
                         var groupValue = ReadGroup(subGroup.Id);
-                        variables.Add(new MatVariable(groupValue, variableName, false));
+                        variables.Add(new MatVariable(groupValue, variableName, isGlobal));
                     }
                     break;
                 default: