public static MachLoadCommand CreateFromStream(ReadingContext SR)
{
long StartingStreamPosition = SR.Position;
// Read the code and size (common to all commands)
UInt32 CommandCode = SR.ReadUInt32();
UInt32 CommandSize = SR.ReadUInt32();
UInt32 EffectiveCommand = CommandCode & ~(1 << 31);
MachLoadCommand Result;
switch (EffectiveCommand)
{
case LC_SEGMENT:
Result = new MachLoadCommandSegment(Bits.Num._32);
break;
case LC_SEGMENT_64:
Result = new MachLoadCommandSegment(Bits.Num._64);
break;
case LC_SYMTAB:
Result = new MachLoadCommandSymbolTable();
break;
case LC_THREAD:
case LC_UNIXTHREAD:
Result = new MachLoadCommandMainThreadInfo();
break;
case LC_DYSYMTAB:
Result = new MachLoadCommandDynamicSymbolTable();
break;
case LC_LOAD_DYLIB:
case LC_LOAD_WEAK_DYLIB:
case LC_ID_DYLIB:
Result = new MachLoadCommandDylib();
break;
case LC_LOAD_DYLINKER:
case LC_ID_DYLINKER:
Result = new MachLoadCommandDynamicLinkerName();
break;
case LC_UUID:
Result = new MachLoadCommandUUID();
break;
case LC_CODE_SIGNATURE:
Result = new MachLoadCommandCodeSignature();
break;
case LC_ENCRYPTION_INFO:
Result = new MachLoadCommandEncryptedSegmentInfo();
break;
case LC_DYLD_INFO:
Result = new MachLoadCommandDynamicLoaderInfo();
break;
default:
Result = new MachLoadCommandOpaque();
break;
}
// MSB of CommandCode is LC_REQ_DYLD or 0, indicating if the command can (theoretically) be ignored
// or is critical to loading
Result.StartingLoadOffset = StartingStreamPosition;
Result.Command = EffectiveCommand;
Result.RequiredForDynamicLoad = (CommandCode >> 31) != 0;
Result.UnpackageData(SR, (int)CommandSize);
SR.VerifyStreamPosition(StartingStreamPosition, CommandSize);
return Result;
}
public void Read(ReadingContext SR)
{
long ExpectedStreamPosition = 0;
int NumInt = 7;
// Read the header
Magic = SR.ReadUInt32();
CpuType = SR.ReadUInt32();
CpuSubType = SR.ReadUInt32();
FileType = SR.ReadUInt32();
UInt32 NumCommands = SR.ReadUInt32();
UInt32 SizeOfCommands = SR.ReadUInt32();
Flags = SR.ReadUInt32();
if (Magic == MH_MAGIC_64)
{
Reserved64 = SR.ReadUInt32();
NumInt++;
}
SR.VerifyStreamPosition(ref ExpectedStreamPosition, NumInt * sizeof(UInt32));
// Read the commands
Commands.Clear();
for (int LoadCommandIndex = 0; LoadCommandIndex < NumCommands; ++LoadCommandIndex)
{
MachLoadCommand Command = MachLoadCommand.CreateFromStream(SR);
Commands.Add(Command);
if (Config.bCodeSignVerbose)
{
Console.WriteLine(" Read command: {0}", Command.ToString());
}
}
SR.VerifyStreamPosition(ref ExpectedStreamPosition, SizeOfCommands);
}
