Fix no bits section

Author: xoofx

src/LibObjectFile/Elf/ElfFile.Read.cs

@@ -129,6 +129,15 @@ private unsafe void VerifyAndFixProgramHeadersAndSections(ElfReader reader)
         for (int i = 0; i < contentList.Count; i++)
         {
             var part = contentList[i];
+            if (part is ElfSection section && !section.HasContent)
+            {
+                if (section is ElfNoBitsSection noBitsSection)
+                {
+                    noBitsSection.PositionOffsetFromPreviousContent = part.Position - contentList[i - 1].Position;
+                }
+                continue;
+            }
+
             if (part.Position > currentPosition)
             {
                 var streamContent = new ElfStreamContentData(true)
@@ -141,16 +150,7 @@ private unsafe void VerifyAndFixProgramHeadersAndSections(ElfReader reader)
                 currentPosition = part.Position;
                 i++;
             }
-            else if (part.Position < currentPosition && part is ElfNoBitsSection notBitsSection)
-            {
-                notBitsSection.PositionOffsetIntoPreviousSection = part.Position - contentList[i-1].Position;
-            }
-
-            if (part is ElfSection section && !section.HasContent)
-            {
-                continue;
-            }
-
+            
             currentPosition += part.Size;
         }
 

src/LibObjectFile/Elf/ElfFile.Write.cs

@@ -21,6 +21,11 @@ public override void Write(ElfWriter writer)
         for (var i = 0; i < contentList.Count; i++)
         {
             var content = contentList[i];
+            if (content is ElfSection section && section.Type == ElfSectionType.NoBits)
+            {
+                continue;
+            }
+
             if (content.Position > writer.Position)
             {
                 writer.WriteZero((int)(content.Position - writer.Position));

src/LibObjectFile/Elf/ElfFile.cs

@@ -317,9 +317,9 @@ public unsafe void UpdateLayout(DiagnosticBag diagnostics)
             var content = contentList[i];
             if (content is ElfNullSection) continue;
 
-            if (content is ElfNoBitsSection noBitsSection && noBitsSection.PositionOffsetIntoPreviousSection.HasValue)
+            if (content is ElfNoBitsSection noBitsSection && noBitsSection.PositionOffsetFromPreviousContent.HasValue)
             {
-                content.Position = contentList[i-1].Position + noBitsSection.PositionOffsetIntoPreviousSection.Value;
+                content.Position = contentList[i-1].Position + noBitsSection.PositionOffsetFromPreviousContent.Value;
             }
             else
             {

src/LibObjectFile/Elf/Sections/ElfNoBitsSection.cs

@@ -10,7 +10,7 @@ public ElfNoBitsSection() : base(ElfSectionType.NoBits)
     {
     }
 
-    public ulong? PositionOffsetIntoPreviousSection { get; set; }
+    public ulong? PositionOffsetFromPreviousContent { get; set; }
 
     public override void Read(ElfReader reader)
     {