Merge pull request #44 from LANControlSystems/FixesToSave

Fixes to ElfFile to be able to save a core file.

Author: xoofx

src/LibObjectFile/Elf/ElfFile.cs

@@ -33,14 +33,14 @@ public sealed partial class ElfFile : ElfObject, IEnumerable<ElfContent>
     /// <summary>
     /// Creates a new instance with the default sections (null and a shadow program header table).
     /// </summary>
-    public ElfFile(ElfArch arch) : this(arch, ElfFileClass.None, ElfEncoding.None)
+    public ElfFile(ElfArch arch, bool addDefaultSections=true) : this(arch, ElfFileClass.None, ElfEncoding.None, addDefaultSections)
     {
     }
 
     /// <summary>
     /// Creates a new instance with the default sections (null and a shadow program header table).
     /// </summary>
-    public ElfFile(ElfArch arch, ElfFileClass fileClass, ElfEncoding encoding) : this(true)
+    public ElfFile(ElfArch arch, ElfFileClass fileClass, ElfEncoding encoding,bool addDefaultSections=true) : this(addDefaultSections)
     {
         Arch = arch;
         switch (arch)

src/LibObjectFile/Elf/ElfProgramHeaderTable.cs

@@ -59,6 +59,11 @@ public override void Verify(ElfVisitorContext context)
 
     protected override unsafe void UpdateLayoutCore(ElfVisitorContext context)
     {
+        var elf = Parent;
+        if (elf != null)
+        {
+            _is32 = elf.FileClass == ElfFileClass.Is32;
+        }
         Size = (ulong)(Parent!.Segments.Count * (AdditionalEntrySize + (_is32 ? sizeof(ElfNative.Elf32_Phdr) : sizeof(ElfNative.Elf64_Phdr))));
     }