public DisassemblyResult DisassembleReachable(Stream data, int start, int length)
{
data.Seek(start, SeekOrigin.Begin);
var ret = new DisassemblyResult();
int readingLeft = length;
var starts = new LinkedList <int>();
starts.AddFirst(start);
bool continueAfterCurrent = true;
do
{
var du = TryDisassembleInstruction(data, readingLeft);
if (du != null)
{
ret.AddInstruction(du);
readingLeft -= (int)du.Format;
if (Instruction.IsJump(du.Operation))
{
var jumpTarget = du.Operands[0].Value.Value;
var flags = du.Flags;
if (flags.HasFlag(InstructionFlags.P))
{
jumpTarget += (int)data.Position;
}
Debug.WriteLine($"Adding new start: {jumpTarget:x}");
starts.AddLast(jumpTarget);
if (du.Operation == Instruction.Mnemonic.J)
{
continueAfterCurrent = false;
}
}
}
if (!continueAfterCurrent)
{
int newStart;
do
{
if (starts.Count == 0)
{
Debug.WriteLine("No more disassembly starts. Exiting.");
return(ret);
}
newStart = starts.First.Value;
starts.RemoveFirst();
Debug.WriteLine($"Removed next start: {newStart:x}...");
// If instruction at 'newStart' has already been disassembled, discard this start and grab another.
}while (ret.FindInstruction(newStart, out _));
Debug.WriteLine($"Using start: {newStart:x}...");
data.Seek(newStart, SeekOrigin.Begin);
}
} while (readingLeft > 0); // (starts.Count > 0);
return(ret);
}
//public DisassemblyResult DisassembleWithContinue(byte[] data, int offset, int length)
//{
// return DisassembleWithContinue(new MemoryStream(data, offset, length), 0, length);
//}
/// <summary>
/// Disassembles the data stream in the specified region, continuing on error until the next valid instruction is found.
/// </summary>
/// <param name="data"></param>
/// <param name="offset">The index in the stream to begin reading.</param>
/// <param name="length">The maximum number of bytes to read from the stream.</param>
/// <returns></returns>
public DisassemblyResult DisassembleWithContinue(Stream data, int offset, int length)
{
data.Seek(offset, SeekOrigin.Begin);
var ret = new DisassemblyResult();
Instruction nextInstr;
while (data.Position < offset + length)
{
nextInstr = TryDisassembleInstruction(data, length);
if (nextInstr != null)
{
ret.AddInstruction(nextInstr);
}
}
return(ret);
}
//public DisassemblyResult Disassemble(byte[] data, int offset, int length)
//{
// return Disassemble(new MemoryStream(data, offset, length), 0, length);
//}
/// <summary>
/// Disassembles the data stream in the specified region, stopping if an invalid instruction is hit.
/// </summary>
/// <param name="data"></param>
/// <param name="offset">The index in the stream to begin reading.</param>
/// <param name="length">The maximum number of bytes to read from the stream.</param>
/// <returns></returns>
public DisassemblyResult Disassemble(Stream data, int offset, int length)
{
data.Seek(offset, SeekOrigin.Begin);
var ret = new DisassemblyResult();
int successBytes = 0;
Instruction nextInstr;
while (successBytes < offset + length)
{
nextInstr = TryDisassembleInstruction(data, length);
if (nextInstr == null)
{
return(ret);
}
ret.AddInstruction(nextInstr);
successBytes += (int)nextInstr.Format;
}
return(ret);
}
