private static object ReadValue(BufferedBinaryReader reader, SystemTypeCode type)
{
switch (type)
{
case SystemTypeCode.Boolean:
return(reader.ReadBoolean());
case SystemTypeCode.Int8:
return(reader.ReadInt8());
case SystemTypeCode.UInt8:
return(reader.ReadUInt8());
case SystemTypeCode.Int16:
return(reader.ReadInt16());
case SystemTypeCode.UInt16:
return(reader.ReadUInt16());
case SystemTypeCode.Int32:
return(reader.ReadInt32());
case SystemTypeCode.UInt32:
return(reader.ReadUInt32());
case SystemTypeCode.Int64:
return(reader.ReadInt64());
case SystemTypeCode.UInt64:
return(reader.ReadUInt64());
case SystemTypeCode.Single:
return(reader.ReadSingle());
case SystemTypeCode.Double:
return(reader.ReadDouble());
case SystemTypeCode.Decimal:
throw new NotImplementedException();
case SystemTypeCode.DateTime:
throw new NotImplementedException();
case SystemTypeCode.Char:
return(reader.ReadChar());
case SystemTypeCode.String:
return(reader.ReadCountedUtf8());
case SystemTypeCode.Enum:
throw new NotImplementedException();
default:
throw new ArgumentOutOfRangeException();
}
}
private static object ReadValue(ElementType type, BufferedBinaryReader reader)
{
switch (type)
{
case ElementType.Boolean:
return(reader.ReadBoolean());
case ElementType.Char:
return(reader.ReadChar());
case ElementType.Int8:
return(reader.ReadSByte());
case ElementType.UInt8:
return(reader.ReadByte());
case ElementType.Int16:
return(reader.ReadInt16());
case ElementType.UInt16:
return(reader.ReadUInt16());
case ElementType.Int32:
return(reader.ReadInt32());
case ElementType.UInt32:
return(reader.ReadUInt32());
case ElementType.Int64:
return(reader.ReadInt64());
case ElementType.UInt64:
return(reader.ReadUInt64());
case ElementType.Single:
return(reader.ReadSingle());
case ElementType.Double:
return(reader.ReadDouble());
case ElementType.String:
return(Encoding.Unicode.GetString(reader.ToArray()));
case ElementType.Class:
return(null);
default:
return(reader.ToArray());
}
}
/// <summary>
/// Obtains the value of this field from the specified <see cref="BufferedBinaryReader"/>.
/// </summary>
/// <param name="br">The <see cref="BufferedBinaryReader"/> to read from.</param>
/// <returns>The object that was read.</returns>
/// <remarks>
/// While it may technically be possible to remove this boxing by doing the switch statement
/// outside of the class (where this method is being used), the result goes directly into
/// a DataRow which boxes anyway.
/// </remarks>
internal object GetValue(ref BufferedBinaryReader br)
{
//IMPLEMENT: Support for DBT files. https://en.wikipedia.org/wiki/.dbf#Level_5_DOS_headers
try
{
switch (FieldType)
{
case EFieldType.Memo:
case EFieldType.Character:
//TODO: Can we do this without allocation of another string that trims the 0-bytes? Is it safe to remove trailing 0 bytes?
return(Encoding.GetString(br.ReadBytes(FieldLength)).Trim('\0'));
case EFieldType.Binary:
case EFieldType.General:
// We do not support DBT tables.
return(DBNull.Value);
case EFieldType.Float:
case EFieldType.Numeric:
// We cannot simply assume it takes up 4 or 8 bytes for a float or double respectively.
return(double.Parse(Encoding.GetString(br.ReadBytes(FieldLength)), NumericCulture));
case EFieldType.Logical:
{
string value = Encoding.GetString(br.ReadBytes(FieldLength));
return(value == "Y" || value == "y"
? true
: value == "?"
? (object)DBNull.Value
: false);
}
case EFieldType.Date: return(DateTime.TryParseExact(Encoding.GetString(br.ReadBytes(FieldLength)), "yyyyMMdd", DateCulture, DateTimeStyles.None, out var result) ? result : (object)DBNull.Value);
case EFieldType.DateTime: return(DateTime.FromOADate(br.ReadInt64() - 2415018.5));
default: return(DBNull.Value);
}
}
catch (FormatException e)
{
throw new FormatException($"Input string was not in a correct format [DbType = {FieldType}].", e);
}
}
private object ReadValue(BufferedBinaryReader reader, IType type)
{
var st = type.SystemType();
if (st != null)
{
switch (st.Code)
{
case SystemTypeCode.Boolean:
return reader.ReadBoolean();
case SystemTypeCode.Int8:
return reader.ReadInt8();
case SystemTypeCode.UInt8:
return reader.ReadUInt8();
case SystemTypeCode.Int16:
return reader.ReadInt16();
case SystemTypeCode.UInt16:
return reader.ReadUInt16();
case SystemTypeCode.Int32:
return reader.ReadInt32();
case SystemTypeCode.UInt32:
return reader.ReadUInt32();
case SystemTypeCode.Int64:
return reader.ReadInt64();
case SystemTypeCode.UInt64:
return reader.ReadUInt64();
case SystemTypeCode.Single:
return reader.ReadSingle();
case SystemTypeCode.Double:
return reader.ReadDouble();
case SystemTypeCode.Char:
return reader.ReadChar();
case SystemTypeCode.String:
return reader.ReadCountedUtf8();
case SystemTypeCode.Object:
//boxed value type
var e = (ElementType)reader.ReadInt8();
return ReadValue(reader, e);
case SystemTypeCode.Type:
return ReadType(reader);
}
}
if (type.TypeKind == TypeKind.Enum)
{
return ReadValue(reader, type.ValueType);
}
if (type.IsArray)
{
int numElem = reader.ReadInt32();
Array arr = null;
for (int i = 0; i < numElem; ++i)
{
var val = ReadValue(reader, type.ElementType);
if (arr == null)
arr = Array.CreateInstance(val.GetType(), numElem);
arr.SetValue(val, i);
}
return arr;
}
return null;
}
private object ReadValue(BufferedBinaryReader reader, ElementType e)
{
switch (e)
{
case ElementType.Boolean:
return reader.ReadBoolean();
case ElementType.Char:
return reader.ReadChar();
case ElementType.Int8:
return reader.ReadSByte();
case ElementType.UInt8:
return reader.ReadByte();
case ElementType.Int16:
return reader.ReadInt16();
case ElementType.UInt16:
return reader.ReadUInt16();
case ElementType.Int32:
return reader.ReadInt32();
case ElementType.UInt32:
return reader.ReadUInt32();
case ElementType.Int64:
return reader.ReadInt64();
case ElementType.UInt64:
return reader.ReadUInt64();
case ElementType.Single:
return reader.ReadSingle();
case ElementType.Double:
return reader.ReadDouble();
case ElementType.String:
return reader.ReadCountedUtf8();
case ElementType.Object:
case ElementType.CustomArgsBoxedObject:
{
var elem = (ElementType)reader.ReadInt8();
return ReadValue(reader, elem);
}
case ElementType.CustomArgsEnum:
{
string enumTypeName = reader.ReadCountedUtf8();
var enumType = FindType(enumTypeName);
if (enumType == null)
{
//TODO:
throw new BadMetadataException();
}
return ReadValue(reader, enumType);
}
case ElementType.CustomArgsType:
return ReadType(reader);
case ElementType.ArraySz:
{
var arrElemType = (ElementType)reader.ReadInt8();
return ReadArray(reader, arrElemType);
}
default:
throw new ArgumentOutOfRangeException();
}
}
private static Instruction ReadInstruction(IMethod method, IMethodContext context, BufferedBinaryReader reader, long startPosition)
{
var instr = new Instruction
{
Offset = (int)(reader.Position - startPosition),
OpCode = OpCodes.Nop
};
byte op = reader.ReadUInt8();
OpCode?opCode;
if (op != CIL.MultiBytePrefix)
{
opCode = CIL.GetShortOpCode(op);
}
else
{
op = reader.ReadUInt8();
opCode = CIL.GetLongOpCode(op);
}
if (!opCode.HasValue)
{
throw new BadImageFormatException(string.Format("The format of instruction with code {0} is invalid", op));
}
instr.OpCode = opCode.Value;
//Read operand
switch (instr.OpCode.OperandType)
{
case OperandType.InlineI:
instr.Value = reader.ReadInt32();
break;
case OperandType.ShortInlineI:
instr.Value = (int)reader.ReadSByte();
break;
case OperandType.InlineI8:
instr.Value = reader.ReadInt64();
break;
case OperandType.InlineR:
instr.Value = reader.ReadDouble();
break;
case OperandType.ShortInlineR:
instr.Value = reader.ReadSingle();
break;
case OperandType.InlineBrTarget:
{
int offset = reader.ReadInt32();
instr.Value = (int)(offset + reader.Position - startPosition);
}
break;
case OperandType.ShortInlineBrTarget:
{
int offset = reader.ReadSByte();
instr.Value = (int)(offset + reader.Position - startPosition);
}
break;
case OperandType.InlineSwitch:
{
int casesCount = reader.ReadInt32();
var switchBranches = new int[casesCount];
for (int k = 0; k < casesCount; k++)
{
switchBranches[k] = reader.ReadInt32();
}
int shift = (int)(reader.Position - startPosition);
for (int k = 0; k < casesCount; k++)
{
switchBranches[k] += shift;
}
instr.Value = switchBranches;
}
break;
case OperandType.InlineVar:
instr.Value = (int)reader.ReadUInt16();
break;
case OperandType.ShortInlineVar:
instr.Value = reader.ReadByte();
break;
case OperandType.InlineString:
{
int token = reader.ReadInt32();
instr.Value = context.ResolveMetadataToken(method, token);
}
break;
case OperandType.InlineField:
case OperandType.InlineMethod:
case OperandType.InlineSig:
case OperandType.InlineTok:
case OperandType.InlineType:
{
int token = reader.ReadInt32();
instr.MetadataToken = token;
object val = context.ResolveMetadataToken(method, token);
if (val is ITypeMember)
{
}
if (val == null)
{
#if DEBUG
if (DebugHooks.BreakInvalidMetadataToken)
{
Debugger.Break();
val = context.ResolveMetadataToken(method, token);
}
#endif
throw new BadTokenException(token);
}
instr.Value = val;
}
break;
case OperandType.InlineNone:
// no operand
break;
case OperandType.InlinePhi:
throw new BadImageFormatException(@"Obsolete. The InlinePhi operand is reserved and should not be used!");
}
return(instr);
}