/// <summary>
/// Identifies if the specified executable is a Microsoft/IBM Linear EXecutable
/// </summary>
/// <returns><c>true</c> if the specified executable is a Microsoft/IBM Linear EXecutable, <c>false</c> otherwise.</returns>
/// <param name="stream">Stream containing the executable.</param>
public static bool Identify(FileStream stream)
{
FileStream baseStream = stream;
baseStream.Seek(0, SeekOrigin.Begin);
byte[] buffer = new byte[Marshal.SizeOf(typeof(GeodeHeaderV2))];
baseStream.Read(buffer, 0, buffer.Length);
GeodeHeader header = BigEndianMarshal.ByteArrayToStructureLittleEndian <GeodeHeader>(buffer);
GeodeHeaderV2 header2 = BigEndianMarshal.ByteArrayToStructureLittleEndian <GeodeHeaderV2>(buffer);
return(header.magic == GEOS_ID && header.type == FileType.GFT_EXECUTABLE ||
header2.magic == GEOS2_ID && header2.type == FileType2.GFT_EXECUTABLE);
}
void Initialize()
{
Recognized = false;
if (BaseStream == null)
{
return;
}
BaseStream.Seek(0, SeekOrigin.Begin);
byte[] buffer = new byte[Marshal.SizeOf(typeof(GeodeHeaderV2))];
BaseStream.Read(buffer, 0, buffer.Length);
header = BigEndianMarshal.ByteArrayToStructureLittleEndian <GeodeHeader>(buffer);
header2 = BigEndianMarshal.ByteArrayToStructureLittleEndian <GeodeHeaderV2>(buffer);
Recognized = header.magic == GEOS_ID && header.type == FileType.GFT_EXECUTABLE ||
header2.magic == GEOS2_ID && header2.type == FileType2.GFT_EXECUTABLE;
if (!Recognized)
{
return;
}
isNewHeader = header2.magic == GEOS2_ID;
RequiredOperatingSystem = new OperatingSystem {
Name = "GEOS", MajorVersion = isNewHeader ? 2 : 1
};
List <string> strings = new List <string>
{
StringHandlers.CToString(isNewHeader ? header2.name : header.name, geosEncoding),
StringHandlers.CToString(isNewHeader ? header2.copyright : header.copyright, geosEncoding),
StringHandlers.CToString(isNewHeader ? header2.info : header.info, geosEncoding)
};
uint segmentBase = 0;
if (isNewHeader)
{
BaseStream.Position = Marshal.SizeOf(typeof(GeodeHeaderV2));
buffer = new byte[Marshal.SizeOf(typeof(ApplicationHeaderV2))];
segmentBase = (uint)Marshal.SizeOf(typeof(GeodeHeaderV2));
BaseStream.Read(buffer, 0, buffer.Length);
applicationHeader2 = BigEndianMarshal.ByteArrayToStructureLittleEndian <ApplicationHeaderV2>(buffer);
imports = new Import[applicationHeader2.imports];
exports = new Export[applicationHeader2.exports];
segments = new SegmentDescriptor[applicationHeader2.segments];
strings.Add($"{StringHandlers.CToString(applicationHeader2.name, geosEncoding).Trim()}.{StringHandlers.CToString(applicationHeader2.extension, geosEncoding).Trim()}");
}
else
{
BaseStream.Position = Marshal.SizeOf(typeof(GeodeHeader));
buffer = new byte[Marshal.SizeOf(typeof(ApplicationHeader))];
BaseStream.Read(buffer, 0, buffer.Length);
applicationHeader = BigEndianMarshal.ByteArrayToStructureLittleEndian <ApplicationHeader>(buffer);
imports = new Import[applicationHeader.imports];
exports = new Export[applicationHeader.exports];
segments = new SegmentDescriptor[applicationHeader.segments];
strings.Add($"{StringHandlers.CToString(applicationHeader.name, geosEncoding).Trim()}.{StringHandlers.CToString(applicationHeader.extension, geosEncoding).Trim()}");
}
buffer = new byte[Marshal.SizeOf(typeof(Import))];
for (int i = 0; i < imports.Length; i++)
{
BaseStream.Read(buffer, 0, buffer.Length);
imports[i] = BigEndianMarshal.ByteArrayToStructureLittleEndian <Import>(buffer);
strings.Add(StringHandlers.CToString(imports[i].name, geosEncoding).Trim());
}
buffer = new byte[Marshal.SizeOf(typeof(Export))];
for (int i = 0; i < exports.Length; i++)
{
BaseStream.Read(buffer, 0, buffer.Length);
exports[i] = BigEndianMarshal.ByteArrayToStructureLittleEndian <Export>(buffer);
}
if (segments.Length > 0)
{
buffer = new byte[Marshal.SizeOf(typeof(SegmentDescriptor)) * segments.Length];
BaseStream.Read(buffer, 0, buffer.Length);
Segment[] mySegments = new Segment[segments.Length];
for (int i = 0; i < segments.Length; i++)
{
segments[i].length = BitConverter.ToUInt16(buffer, 2 * i);
segments[i].offset =
BitConverter.ToUInt32(buffer, 2 * segments.Length + 4 * i) + segmentBase;
segments[i].relocs_length = BitConverter.ToUInt16(buffer, 6 * segments.Length + 2 * i);
segments[i].flags =
(SegmentFlags)BitConverter.ToUInt16(buffer, 8 * segments.Length + 2 * i);
mySegments[i] = new Segment
{
Flags = $"{segments[i].flags}",
Offset = segments[i].offset,
Size = segments[i].length
};
if (i == 1)
{
mySegments[i].Name = ".idata";
}
else if (segments[i].flags.HasFlag(SegmentFlags.HAF_CODE))
{
mySegments[i].Name = ".text";
}
else if (segments[i].flags.HasFlag(SegmentFlags.HAF_OBJECT_RESOURCE))
{
mySegments[i].Name = ".rsrc";
}
else if (segments[i].flags.HasFlag(SegmentFlags.HAF_ZERO_INIT))
{
mySegments[i].Name = ".bss";
}
else if (segments[i].flags.HasFlag(SegmentFlags.HAF_READ_ONLY))
{
mySegments[i].Name = ".rodata";
}
else
{
mySegments[i].Name = ".data";
}
}
Segments = mySegments;
}
strings.Remove("");
strings.Remove(null);
Strings = strings;
}
