diff --git a/ArcFormats/Cri/ImageSPC.cs b/ArcFormats/Cri/ImageSPC.cs
index 36c74963..bd5da105 100644
--- a/ArcFormats/Cri/ImageSPC.cs
+++ b/ArcFormats/Cri/ImageSPC.cs
@@ -47,6 +47,7 @@ namespace GameRes.Formats.Cri
             uint unpacked_size = stream.Signature;
             if (unpacked_size <= 0x20 || unpacked_size > 0x5000000) // ~83MB
                 return null;
+            stream.Position = 4;
             using (var lzss = new LzssStream (stream.AsStream, LzssMode.Decompress, true))
             using (var input = new SeekableStream (lzss))
             using (var xtx = new BinaryStream (input, stream.Name))
diff --git a/ArcFormats/Ikura/ImageDRG.cs b/ArcFormats/Ikura/ImageDRG.cs
index b33a8868..9a99292f 100644
--- a/ArcFormats/Ikura/ImageDRG.cs
+++ b/ArcFormats/Ikura/ImageDRG.cs
@@ -69,6 +69,7 @@ namespace GameRes.Formats.Ikura
             case 0x48474948: bpp = 16; break;
             default: return null;
             }
+            stream.Position = 4;
             uint width = stream.ReadUInt16();
             uint height = stream.ReadUInt16();
             return new ImageMetaData {
diff --git a/ArcFormats/ImageEGN.cs b/ArcFormats/ImageEGN.cs
index 9079493d..84d2acc0 100644
--- a/ArcFormats/ImageEGN.cs
+++ b/ArcFormats/ImageEGN.cs
@@ -51,7 +51,7 @@ namespace GameRes.Formats.Unknown
 
         public override ImageMetaData ReadMetaData (IBinaryStream stream)
         {
-            int signature = (int)~stream.Signature;
+            int signature = ~stream.ReadInt32();
             int mode = (signature & 0x70) >> 4; // v6
             if (0 != (mode & 4))
                 return null;
diff --git a/ArcFormats/Ivory/ImageMOE.cs b/ArcFormats/Ivory/ImageMOE.cs
index e403563b..e432224e 100644
--- a/ArcFormats/Ivory/ImageMOE.cs
+++ b/ArcFormats/Ivory/ImageMOE.cs
@@ -44,6 +44,7 @@ namespace GameRes.Formats.Ivory
             uint height = wh >> 16;
             if (0 == width || width > 800 || 0 == height || height > 600)
                 return null;
+            stream.Position = 4;
             if (!IsValidInput (stream.AsStream, width, height))
                 return null;
             return new ImageMetaData { Width = width, Height = height, BPP = 24 };