Add parsing for binary floats

SaneTsv/SaneTsv.cs

@@ -33,6 +33,18 @@ public class SaneTsv
   public Type[] ColumnTypes { get; protected set; }
   public List<SaneTsvRecord> Records { get; protected set; }
   public string FileComment { get; protected set; } = null;
+  protected static bool? _littleEndian = null;
+  public static bool LittleEndian
+  {
+    get
+    {
+      if (_littleEndian == null)
+      {
+        _littleEndian = BitConverter.GetBytes(double.NegativeInfinity)[7] == 255;
+      }
+      return _littleEndian.Value;
+    }
+  }
 
   public static SaneTsv ParseSimpleTsv(byte[] inputBuffer)
   {
@@ -303,6 +315,44 @@ public class SaneTsv
         parsedFields[j] = fields[j];
         continue;
       }
+      else if (parsed.ColumnTypes[j] == typeof(Float32LEType))
+      {
+        byte[] floatBytes;
+        if (!LittleEndian)
+        {
+          floatBytes = new byte[sizeof(float)];
+          for (int k = 0; k < sizeof(float); k++)
+          {
+            floatBytes[k] = fields[j][sizeof(float) - 1 - k];
+          }
+        }
+        else
+        {
+          floatBytes = fields[j];
+        }
+        parsedFields[j] = BitConverter.ToSingle(floatBytes, 0);
+
+        continue;
+      }
+      else if (parsed.ColumnTypes[j] == typeof(Float64LEType))
+      {
+        byte[] floatBytes;
+        if (!LittleEndian)
+        {
+          floatBytes = new byte[sizeof(double)];
+          for (int k = 0; k < sizeof(double); k++)
+          {
+            floatBytes[k] = fields[j][sizeof(double) - 1 - k];
+          }
+        }
+        else
+        {
+          floatBytes = fields[j];
+        }
+        parsedFields[j] = BitConverter.ToDouble(floatBytes, 0);
+
+        continue;
+      }
 
       string fieldString;
       try
@@ -347,13 +397,6 @@ public class SaneTsv
 
         parsedFields[j] = parsedFloat;
       }
-      else if (parsed.ColumnTypes[j] == typeof(Float32LEType))
-      {
-        throw new NotImplementedException();
-        // TODO: Implement and do byte-swapping if necessary
-
-        //parsedFields[j] = parsedFloat;
-      }
       else if (parsed.ColumnTypes[j] == typeof(Float64Type))
       {
         if (!double.TryParse(fieldString, out double parsedDouble))
@@ -363,13 +406,6 @@ public class SaneTsv
 
         parsedFields[j] = parsedDouble;
       }
-      else if (parsed.ColumnTypes[j] == typeof(Float64LEType))
-      {
-        throw new NotImplementedException();
-        // TODO: Implement and do byte-swapping if necessary
-
-        //parsedFields[j] = parsedFloat;
-      }
       else if (parsed.ColumnTypes[j] == typeof(UInt32Type))
       {
         if (!UInt32.TryParse(fieldString, out UInt32 parsedUInt32))

SaneTsv/SaneTsvTest/Program.cs

@@ -1,4 +1,5 @@
 using NathanMcRae;
+using System.Linq;
 using System.Text;
 
 {
@@ -68,6 +69,24 @@ using System.Text;
   }
 }
 
+{
+  string testName = "Float binary test";
+  var bytes = new List<byte>();
+  bytes.AddRange(Encoding.UTF8.GetBytes("somefloat:float64\tbinfloat:float64-le" +
+    "\n1.5\t")); bytes.AddRange(BitConverter.GetBytes(1.5));
+  bytes.AddRange(Encoding.UTF8.GetBytes("\n-8.0000005E-14\t")); bytes.AddRange(BitConverter.GetBytes(-8.0000005E-14));
+
+  SaneTsv parsed = SaneTsv.ParseTypedTsv(bytes.ToArray());
+  if ((double)parsed.Records[0]["binfloat"] == (double)parsed.Records[0]["somefloat"])
+  {
+    Console.WriteLine($"Passed {testName}");
+  }
+  else
+  {
+    Console.WriteLine($"Failed {testName}");
+  }
+}
+
 Console.WriteLine("Done with tests");