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Use new marshaller in 2MG disk images.

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Natalia Portillo
2019-03-15 18:56:13 +00:00
parent b7e98859b0
commit addb0b9576
2 changed files with 13 additions and 33 deletions
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27
DiscImageChef.DiscImages/Apple2MG/Identify.cs
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@@ -30,9 +30,9 @@
// Copyright © 2011-2019 Natalia Portillo
// ****************************************************************************/
using System;
using System.IO;
using DiscImageChef.CommonTypes.Interfaces;
using DiscImageChef.Helpers;
namespace DiscImageChef.DiscImages
{
@@ -48,28 +48,23 @@ namespace DiscImageChef.DiscImages
byte[] header = new byte[64];
stream.Read(header, 0, 64);
uint magic = BitConverter.ToUInt32(header, 0x00);
if(magic != MAGIC) return false;
A2ImgHeader hdr = Marshal.SpanToStructureLittleEndian<A2ImgHeader>(header);
uint dataoff = BitConverter.ToUInt32(header, 0x18);
if(dataoff > stream.Length) return false;
if(hdr.Magic != MAGIC) return false;
if(hdr.DataOffset > stream.Length) return false;
uint datasize = BitConverter.ToUInt32(header, 0x1C);
// There seems to be incorrect endian in some images on the wild
if(datasize == 0x00800C00) datasize = 0x000C8000;
if(dataoff + datasize > stream.Length) return false;
if(hdr.DataSize == 0x00800C00) hdr.DataSize = 0x000C8000;
if(hdr.DataOffset + hdr.DataSize > stream.Length) return false;
uint commentoff = BitConverter.ToUInt32(header, 0x20);
if(commentoff > stream.Length) return false;
if(hdr.CommentOffset > stream.Length) return false;
uint commentsize = BitConverter.ToUInt32(header, 0x24);
if(commentoff + commentsize > stream.Length) return false;
if(hdr.CommentOffset + hdr.CommentSize > stream.Length) return false;
uint creatoroff = BitConverter.ToUInt32(header, 0x28);
if(creatoroff > stream.Length) return false;
if(hdr.CreatorSpecificOffset > stream.Length) return false;
uint creatorsize = BitConverter.ToUInt32(header, 0x2C);
return creatoroff + creatorsize <= stream.Length;
return hdr.CreatorSpecificOffset + hdr.CreatorSpecificSize <= stream.Length;
}
}
}