com.jniwrapper

Class ArithmeticalPointer

java.lang.Object

com.jniwrapper.Parameter

com.jniwrapper.Pointer

com.jniwrapper.ArithmeticalPointer

All Implemented Interfaces:

PointerParameter

public class ArithmeticalPointer
extends Pointer

Pointer to a place within an allocated structure that handles reading and writing of offset pointer values. A referenced object is always read and written at the same location.

Nested Class Summary

Nested classes/interfaces inherited from class com.jniwrapper.Pointer

Pointer.Const, Pointer.OutOnly, Pointer.Void

Field Summary

Fields inherited from class com.jniwrapper.Pointer

POINTER_LENGTH

Fields inherited from class com.jniwrapper.Parameter

LICENSE_TYPE, V

Constructor Summary

Constructors

Constructor and Description
ArithmeticalPointer(Parameter ref) Constructs a pointer to a given object.

Method Summary

Modifier and Type	Method and Description
void	add(int i) Offsets this pointer by i bytes forward.
int	getArithmeticOffset() Returns offset in bytes of this pointer from its initial value.
protected void	readPointer(DataBuffer stackBuffer, int offset) Reads a pointer value and referenced object.
void	subtract(int i) Offsets this pointer by i bytes backward.
protected void	writePointer(DataBuffer stackBuffer, int offset) Writes a pointer value using pointer arithmetic offset.

Methods inherited from class com.jniwrapper.Pointer

acceptIOPerformer, asTypedPointer, asVoidPointer, castTo, castTo, checkMemHandleLength, clone, equals, getDebugInfo, getLength, getParameterClass, getPointerHandle, getReferencedObject, isNull, pop, push, read, read, readReferencedObject, setExternalSource, setNull, setReferencedObject, setReferencedObject, write, write, writeReferencedObject

Methods inherited from class com.jniwrapper.Parameter

asReturnValue, dataBufferAssigned, getAlignedLength, getAlignmentRequirement, getDataBuffer, getDataBufferOffset, hashCode, indent, read, setDataBuffer, toByteArray

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ArithmeticalPointer

public ArithmeticalPointer(Parameter ref)

Constructs a pointer to a given object. The new pointer initially points to the object start location.

Parameters:

ref - a referenced object

Method Detail

add

public void add(int i)

Offsets this pointer by i bytes forward.

Parameters:

i - byte offset

subtract

public void subtract(int i)

Offsets this pointer by i bytes backward.

Parameters:

i - byte offset

getArithmeticOffset

public int getArithmeticOffset()

Returns offset in bytes of this pointer from its initial value.

writePointer

protected void writePointer(DataBuffer stackBuffer,
                            int offset)
                     throws MemoryAccessViolationException

Writes a pointer value using pointer arithmetic offset. The written value is (original_pointer_value + arithmetic_offset).

Note: The referenced object will be written by the original pointer, disregarding the offset value.

Overrides:

writePointer in class Pointer

Parameters:

stackBuffer - the buffer to write into

offset - the offset in the buffer to write pointer at

Throws:

MemoryAccessViolationException

readPointer

protected void readPointer(DataBuffer stackBuffer,
                           int offset)
                    throws MemoryAccessViolationException

Reads a pointer value and referenced object. The offset value is updated if needed, the referenced object location is not.

Overrides:

readPointer in class Pointer

Throws:

MemoryAccessViolationException