private Field[] ReadFields(ulong count, BinaryReader reader, Dictionary <uint, List <Annotation> > annotations)
{
var fields = new Field[count];
long position = 0;
ulong currentFieldIndex = 0;
for (ulong index = 0; index < count; index++)
{
currentFieldIndex += Leb128.ReadUleb(reader);
var accessFlags = Leb128.ReadUleb(reader);
position = reader.BaseStream.Position;
var field = Dex.GetField((uint)currentFieldIndex);
field.AccessFlags = (AccessFlag)accessFlags;
List <Annotation> annotation = null;
annotations.TryGetValue((uint)currentFieldIndex, out annotation);
if (annotation != null)
{
field.Annotations = annotation;
}
fields[index] = field;
reader.BaseStream.Position = position;
}
return(fields);
}
internal EncodedArray(BinaryReader reader)
{
Count = Leb128.ReadUleb(reader);
EncodedValues = new EncodedValue[Count];
for (ulong i = 0; i < Count; i++)
{
EncodedValues[i] = EncodedValue.parse(reader);
}
}
public EncodedAnnotation(BinaryReader reader)
{
AnnotationType = Leb128.ReadUleb(reader);
var size = Leb128.ReadUleb(reader);
Elements = new AnnotationElement[size];
for (ulong i = 0; i < size; i++)
{
Elements[i] = new AnnotationElement(reader);
}
}
private Method[] ReadMethods(ulong count, BinaryReader reader, Dictionary <uint, List <Annotation> > annotations, Dictionary <uint, List <Annotation> > parameterAnnotations)
{
var methods = new Method[count];
long position = 0;
ulong currentMethodIndex = 0;
for (ulong currentMethod = 0; currentMethod < count; currentMethod++)
{
currentMethodIndex += Leb128.ReadUleb(reader);
var accessFlags = Leb128.ReadUleb(reader);
var codeOffset = (uint)Leb128.ReadUleb(reader);
position = reader.BaseStream.Position;
var method = Dex.GetMethod((uint)currentMethodIndex, codeOffset);
method.AccessFlags = accessFlags;
List <Annotation> annotation = null;
annotations.TryGetValue((uint)currentMethodIndex, out annotation);
if (annotation != null)
{
method.Annotations = annotation;
}
List <Annotation> parameterAnnotation = null;
parameterAnnotations.TryGetValue((uint)currentMethodIndex, out parameterAnnotation);
if (parameterAnnotation != null)
{
method.ParameterAnnotations = parameterAnnotation;
}
methods[currentMethod] = method;
reader.BaseStream.Position = position;
}
return(methods);
}
/// <summary>
/// Constructor
/// </summary>
/// <param name='dex'>
/// Pointer to the DEX file this class was loaded from
/// </param>
internal Class(Dex dex, BinaryReader reader)
{
Dex = dex;
ClassIndex = reader.ReadUInt32();
AccessFlags = (AccessFlag)reader.ReadUInt32();
SuperClassIndex = reader.ReadUInt32();
var interfacesOffset = reader.ReadUInt32();
SourceFileIndex = reader.ReadUInt32();
var annotationsOffset = reader.ReadUInt32();
var classDataOffset = reader.ReadUInt32();
var staticValuesOffset = reader.ReadUInt32();
Interfaces = dex.ReadTypeList(interfacesOffset);
var fieldAnnotations = new Dictionary <uint, List <Annotation> >();
var methodAnnotations = new Dictionary <uint, List <Annotation> >();
var parameterAnnotations = new Dictionary <uint, List <Annotation> >();
if (annotationsOffset != 0)
{
reader.BaseStream.Position = annotationsOffset;
// annotations_directory_item
var classAnnotationsOffset = reader.ReadUInt32();
var annotatedFieldsCount = reader.ReadUInt32();
var annotatedMethodsCount = reader.ReadUInt32();
var annotatedParametersCount = reader.ReadUInt32();
for (int i = 0; i < annotatedFieldsCount; i++)
{
// field_annotation
var fieldIndex = reader.ReadUInt32();
var annotations = Annotation.ReadAnnotations(reader);
fieldAnnotations.Add(fieldIndex, annotations);
}
for (int i = 0; i < annotatedMethodsCount; i++)
{
// method_annotation
var methodIndex = reader.ReadUInt32();
var annotations = Annotation.ReadAnnotations(reader);
methodAnnotations.Add(methodIndex, annotations);
}
for (int i = 0; i < annotatedParametersCount; i++)
{
// parameter_annotation
var methodIndex = reader.ReadUInt32();
var annotations = Annotation.ReadAnnotations(reader);
parameterAnnotations.Add(methodIndex, annotations);
}
if (classAnnotationsOffset > 0)
{
reader.BaseStream.Position = classAnnotationsOffset;
Annotations = Annotation.ReadAnnotationSetItem(reader);
}
}
if (classDataOffset != 0)
{
reader.BaseStream.Position = classDataOffset;
var staticFieldsCount = Leb128.ReadUleb(reader);
var instanceFieldsCount = Leb128.ReadUleb(reader);
var directMethodsCount = Leb128.ReadUleb(reader);
var virtualMethodsCount = Leb128.ReadUleb(reader);
StaticFields = ReadFields(staticFieldsCount, reader, fieldAnnotations);
InstanceFields = ReadFields(instanceFieldsCount, reader, fieldAnnotations);
DirectMethods = ReadMethods(directMethodsCount, reader, methodAnnotations, parameterAnnotations);
VirtualMethods = ReadMethods(virtualMethodsCount, reader, methodAnnotations, parameterAnnotations);
}
else
{
StaticFields = new Field[0];
InstanceFields = new Field[0];
DirectMethods = new Method[0];
VirtualMethods = new Method[0];
}
if (staticValuesOffset != 0)
{
reader.BaseStream.Position = staticValuesOffset;
var size = Leb128.ReadUleb(reader);
var values = new EncodedValue[size];
for (int i = 0; i < (int)size; i++)
{
values[i] = EncodedValue.parse(reader);
}
StaticFieldsValues = values;
}
else
{
StaticFieldsValues = new EncodedValue[0];
}
}
/// <summary>
/// Read a string at the specified offset in the DEX file. The layout of a String is:
/// length: length of the decoded UTF16 string
/// data: string encoded in MUTF8 ending in a \0
/// </summary>
/// <returns>
/// The string
/// </returns>
/// <param name='offset'>
/// Offset of the string from the beginning of the file
/// </param>
/// <param name='reader'>
/// stream reader to parse values from the Dex file
/// </param>
private string ReadString(uint offset, BinaryReader reader)
{
reader.BaseStream.Position = offset;
// find out the length of the decoded string
var stringLength = (int)Leb128.ReadUleb(reader);
// strings are encoded in MUTF-8 format
char[] chararr = new char[stringLength];
int c, char2, char3;
int chararr_count = 0;
while (chararr_count < stringLength)
{
c = reader.ReadByte();
switch (c >> 4)
{
/* 0xxxxxxx */
case 0:
case 1:
case 2:
case 3:
case 4:
case 5:
case 6:
case 7:
chararr[chararr_count++] = (char)c;
break;
/* 110x xxxx || 10xx xxxx */
case 12:
case 13:
char2 = reader.ReadByte();
if ((char2 & 0xC0) != 0x80)
{
throw new InvalidDataException("MUTF-8 parsing error. 2nd byte must be 10xxxxxx. Dex offset:" + (DexStream.Position - 2));
}
chararr[chararr_count++] = (char)(((c & 0x1F) << 6) | (char2 & 0x3F));
break;
/* 1110 xxxx || 10xx xxxx || 10xx xxxx */
case 14:
char2 = reader.ReadByte();
char3 = reader.ReadByte();
if (((char2 & 0xC0) ^ (char3 & 0xC0)) != 0)
{
throw new InvalidDataException("MUTF-8 parsing error. Both bytes must be 10xxxxxx. Dex offset:" + (DexStream.Position - 3));
}
chararr[chararr_count++] = (char)(((c & 0x0F) << 12) |
((char2 & 0x3F) << 6) |
((char3 & 0x3F) << 0));
break;
default:
throw new InvalidDataException("Invalid MUTF-8 encoding. Dex offset: " + (DexStream.Position - 1));
}
}
// The number of chars produced may be less than utflen
return(new string(chararr, 0, chararr_count));
}
internal Method(uint id, Dex dex, BinaryReader reader, uint codeOffset)
{
Id = id;
Dex = dex;
ClassIndex = reader.ReadUInt16();
PrototypeIndex = reader.ReadUInt16();
NameIndex = reader.ReadUInt32();
Annotations = new Annotation[0];
ParameterAnnotations = new List <Annotation>();
// This method has no opcodes, must be abstract or native.
// Or the method is being loaded directly from the methods list
if (codeOffset != 0)
{
reader.BaseStream.Position = codeOffset;
RegistersSize = reader.ReadUInt16();
ArgumentsSize = reader.ReadUInt16();
ReturnValuesSize = reader.ReadUInt16();
var numberOfTryItems = reader.ReadUInt16();
// Not parsing debug info
/*var debugInfoOffset =*/ reader.ReadUInt32();
CodeLength = reader.ReadUInt32();
CodeOffset = reader.BaseStream.Position;
// Skip the opcode block
reader.BaseStream.Position += CodeLength * 2;
// Skip the optional padding
if ((numberOfTryItems != 0) && (CodeLength % 2 != 0))
{
reader.BaseStream.Position += 2;
}
// Load the try blocks
if (numberOfTryItems != 0)
{
TryCatchBlocks = new TryCatchBlock[numberOfTryItems];
var handlerOffsets = new long[numberOfTryItems];
// read Try
for (int i = 0; i < numberOfTryItems; i++)
{
var tryCatch = new TryCatchBlock(CodeOffset);
tryCatch.StartAddress = reader.ReadUInt32();
tryCatch.InstructionCount = reader.ReadUInt16();
TryCatchBlocks [i] = tryCatch;
handlerOffsets[i] = reader.ReadUInt16();
}
var encodedCatchHandlerListOffset = reader.BaseStream.Position;
// Size of the list, could be used to confirm the DEX is properly
// built. For this purpose will assume DEX files are always good
Leb128.ReadUleb(reader);
// read Catch blocks
for (int i = 0; i < numberOfTryItems; i++)
{
//encoded_catch_handler
if (handlerOffsets [i] > 0)
{
reader.BaseStream.Position = encodedCatchHandlerListOffset + handlerOffsets [i];
var handlersCount = Leb128.ReadLeb(reader);
var handlers = new CatchHandler[handlersCount <= 0 ? Math.Abs(handlersCount) + 1 : handlersCount];
for (int j = 0; j < Math.Abs(handlersCount); j++)
{
var catchHandler = new CatchHandler(CodeOffset);
catchHandler.TypeIndex = Leb128.ReadUleb(reader);
catchHandler.Address = Leb128.ReadUleb(reader);
handlers [j] = catchHandler;
}
// parse the catch all block
if (handlersCount <= 0)
{
var catchHandler = new CatchHandler(CodeOffset);
catchHandler.TypeIndex = 0;
catchHandler.Address = Leb128.ReadUleb(reader);
handlers [handlers.Length - 1] = catchHandler;
}
TryCatchBlocks [i].Handlers = handlers;
}
}
}
}
}
public AnnotationElement(BinaryReader reader)
{
NameIdx = (uint)Leb128.ReadUleb(reader);
Value = EncodedValue.parse(reader);
}
