org.python.modules.jffi

Interface Memory

All Known Subinterfaces:

AllocatedDirectMemory, DirectMemory

All Known Implementing Classes:

HeapMemory, InvalidMemory, NullMemory

public interface Memory

Abstracted memory operations.

This abstracts read/write operations to either a native memory area, or a java ByteBuffer.

Method Summary

Modifier and Type	Method and Description
void	get(long offset, byte[] dst, int off, int len) Reads an array of bytes from the memory area at the specified offset.
void	get(long offset, double[] dst, int off, int len) Reads an array of doubles from the memory area at the specified offset.
void	get(long offset, float[] dst, int off, int len) Reads an array of floats from the memory area at the specified offset.
void	get(long offset, int[] dst, int off, int len) Reads an array of ints from the memory area at the specified offset.
void	get(long offset, long[] dst, int off, int len) Reads an array of longs from the memory area at the specified offset.
void	get(long offset, short[] dst, int off, int len) Reads an array of shorts from the memory area at the specified offset.
long	getAddress(long offset) Reads a pointer value at the specified offset within the memory area.
byte	getByte(long offset) Reads an 8 bit integer value from the memory area.
double	getDouble(long offset) Reads a double value from the memory area.
float	getFloat(long offset) Reads a float value from the memory area.
int	getInt(long offset) Reads a 32 bit integer value from the memory area.
long	getLong(long offset) Reads a 64 bit integer value from the memory area.
DirectMemory	getMemory(long offset) Reads a pointer value at the specified offset within the memory area, and wraps it in an abstract memory accessor.
long	getNativeLong(long offset) Reads a native long integer value from the memory area.
short	getShort(long offset) Reads a 16 bit integer value from the memory area.
byte[]	getZeroTerminatedByteArray(long offset) Reads a zero terminated byte array (e.g.
int	indexOf(long offset, byte value) Gets the first index within the memory area of a particular 8 bit value.
int	indexOf(long offset, byte value, int maxlen) Gets the first index within the memory area of a particular 8 bit value.
boolean	isDirect() Checks if the memory area is a native memory pointer.
boolean	isNull() Checks if the memory area is NULL.
void	put(long offset, byte[] src, int off, int len) Writes an array of bytes to the memory area at the specified offset.
void	put(long offset, double[] src, int off, int len) Writes an array of doubles to the memory area at the specified offset.
void	put(long offset, float[] src, int off, int len) Writes an array of floats to the memory area at the specified offset.
void	put(long offset, int[] src, int off, int len) Writes an array of ints to the memory area at the specified offset.
void	put(long offset, long[] src, int off, int len) Writes an array of longs to the memory area at the specified offset.
void	put(long offset, short[] src, int off, int len) Writes an array of shorts to the memory area at the specified offset.
void	putAddress(long offset, long value) Writes a pointer value to the memory area at the specified offset.
void	putAddress(long offset, Memory value) Writes a pointer value to the memory area at the specified offset.
void	putByte(long offset, byte value) Writes an 8 bit integer value to the memory area at the specified offset.
void	putDouble(long offset, double value) Writes a 64 bit float value to the memory area at the specified offset.
void	putFloat(long offset, float value) Writes a 32 bit float value to the memory area at the specified offset.
void	putInt(long offset, int value) Writes a 32 bit integer value to the memory area at the specified offset.
void	putLong(long offset, long value) Writes a 64 bit integer value to the memory area at the specified offset.
void	putNativeLong(long offset, long value) Writes a native long integer value to the memory area at the specified offset.
void	putShort(long offset, short value) Writes a 16 bit integer value to the memory area at the specified offset.
void	putZeroTerminatedByteArray(long offset, byte[] bytes, int off, int len) Writes a byte array to memory, and appends a zero terminator
void	setMemory(long offset, long size, byte value) Sets the contents of the memory area to the value.
Memory	slice(long offset) Creates a new MemoryIO pointing to a subset of the memory area of this MemoryIO.

Method Detail

isNull

boolean isNull()

Checks if the memory area is NULL.

Returns:

true if the memory area is invalid.

isDirect

boolean isDirect()

Checks if the memory area is a native memory pointer.

Returns:

true if the memory area is a native pointer.

slice

Memory slice(long offset)

Creates a new MemoryIO pointing to a subset of the memory area of this MemoryIO.

Parameters:

offset - The offset within the existing memory area to start the new MemoryIO at.

Returns:

A MemoryIO instance.

getByte

byte getByte(long offset)

Reads an 8 bit integer value from the memory area.

Parameters:

offset - The offset within the memory area to read the value.

Returns:

The 8 bit integer value read from offset

getShort

short getShort(long offset)

Reads a 16 bit integer value from the memory area.

Parameters:

offset - The offset within the memory area to read the value.

Returns:

The 16 bit integer value read from offset

getInt

int getInt(long offset)

Reads a 32 bit integer value from the memory area.

Parameters:

offset - The offset within the memory area to read the value.

Returns:

The 32 bit integer value read from offset

getLong

long getLong(long offset)

Reads a 64 bit integer value from the memory area.

Parameters:

offset - The offset within the memory area to read the value.

Returns:

The 64 bit integer value read from offset

getNativeLong

long getNativeLong(long offset)

Reads a native long integer value from the memory area.

A native long is 32bits on either ILP32 or LLP64 architectures, and 64 bits on an LP64 architecture.

This means that it will always read a 32bit value on Windows, but on Unix systems such as MacOS or Linux, it will read a 32bit value on 32bit systems, and a 64bit value on 64bit systems.

Parameters:

offset - The offset within the memory area to read the value.

Returns:

The native long value read from offset

getFloat

float getFloat(long offset)

Reads a float value from the memory area.

Parameters:

offset - The offset within the memory area to read the value.

Returns:

The float value read from offset

getDouble

double getDouble(long offset)

Reads a double value from the memory area.

Parameters:

offset - The offset within the memory area to read the value.

Returns:

The double value read from offset

getAddress

long getAddress(long offset)

Reads a pointer value at the specified offset within the memory area.

Parameters:

offset - The offset within the memory area to read the value.

Returns:

A long value that represents the address.

getMemory

DirectMemory getMemory(long offset)

Reads a pointer value at the specified offset within the memory area, and wraps it in an abstract memory accessor.

Parameters:

offset - The offset within the memory area to read the value.

Returns:

A DirectMemory accessor that can be used to access the memory pointed to by the address.

getZeroTerminatedByteArray

byte[] getZeroTerminatedByteArray(long offset)

Reads a zero terminated byte array (e.g. an ascii or utf-8 string)

Parameters:

offset - The offset within the memory area of the start of the string.

Returns:

A byte array containing a copy of the data.

putByte

void putByte(long offset,
             byte value)

Writes an 8 bit integer value to the memory area at the specified offset.

Parameters:

offset - The offset within the memory area to write the value.

value - The 8 bit integer value to write to the memory location.

putShort

void putShort(long offset,
              short value)

Writes a 16 bit integer value to the memory area at the specified offset.

Parameters:

offset - The offset within the memory area to write the value.

value - The 16 bit integer value to write to the memory location.

putInt

void putInt(long offset,
            int value)

Writes a 32 bit integer value to the memory area at the specified offset.

Parameters:

offset - The offset within the memory area to write the value.

value - The 32 bit integer value to write to the memory location.

putLong

void putLong(long offset,
             long value)

Writes a 64 bit integer value to the memory area at the specified offset.

Parameters:

offset - The offset within the memory area to write the value.

value - The 64 bit integer value to write to the memory location.

putNativeLong

void putNativeLong(long offset,
                   long value)

Writes a native long integer value to the memory area at the specified offset.

Parameters:

offset - The offset within the memory area to write the value.

value - The native long integer value to write to the memory location.

putFloat

void putFloat(long offset,
              float value)

Writes a 32 bit float value to the memory area at the specified offset.

Parameters:

offset - The offset within the memory area to write the value.

value - The 32 bit float value to write to the memory location.

putDouble

void putDouble(long offset,
               double value)

Writes a 64 bit float value to the memory area at the specified offset.

Parameters:

offset - The offset within the memory area to write the value.

value - The 64 bit float value to write to the memory location.

putAddress

void putAddress(long offset,
                Memory value)

Writes a pointer value to the memory area at the specified offset.

Parameters:

offset - The offset within the memory area to write the value.

value - The pointer value to write to the memory location.

putAddress

void putAddress(long offset,
                long value)

Writes a pointer value to the memory area at the specified offset.

Parameters:

offset - The offset within the memory area to write the value.

value - The pointer value to write to the memory location.

putZeroTerminatedByteArray

void putZeroTerminatedByteArray(long offset,
                                byte[] bytes,
                                int off,
                                int len)

Writes a byte array to memory, and appends a zero terminator

Parameters:

offset - The offset within the memory area of the start of the string.

bytes - The byte array to write to the memory.

off - The offset with the byte array to start copying.

len - The number of bytes of the byte array to write to the memory area. (not including zero byte)

get

void get(long offset,
         byte[] dst,
         int off,
         int len)

Reads an array of bytes from the memory area at the specified offset.

Parameters:

offset - The offset within the memory area to read the bytes.

dst - The output byte array to place the data.

off - The offset within the byte array to start copying.

len - The length of data to read.

put

void put(long offset,
         byte[] src,
         int off,
         int len)

Writes an array of bytes to the memory area at the specified offset.

Parameters:

offset - The offset within the memory area to start writing the bytes.

src - The byte array to write to the memory area.

off - The offset within the byte array to start copying.

len - The length of data to write.

get

void get(long offset,
         short[] dst,
         int off,
         int len)

Reads an array of shorts from the memory area at the specified offset.

Parameters:

offset - The offset within the memory area to read the shorts.

dst - The output array to place the data in.

off - The offset within the array to start copying.

len - The number of shorts to read.

put

void put(long offset,
         short[] src,
         int off,
         int len)

Writes an array of shorts to the memory area at the specified offset.

Parameters:

offset - The offset within the memory area to start writing the shorts.

src - The array to write to the memory area.

off - The offset within the array to start copying.

len - The number of shorts to write.

get

void get(long offset,
         int[] dst,
         int off,
         int len)

Reads an array of ints from the memory area at the specified offset.

Parameters:

offset - The offset within the memory area to read the ints.

dst - The output array to place the data in.

off - The offset within the array to start copying.

len - The number of ints to read.

put

void put(long offset,
         int[] src,
         int off,
         int len)

Writes an array of ints to the memory area at the specified offset.

Parameters:

offset - The offset within the memory area to start writing the ints.

src - The array to write to the memory area.

off - The offset within the array to start copying.

len - The number of ints to write.

get

void get(long offset,
         long[] dst,
         int off,
         int len)

Reads an array of longs from the memory area at the specified offset.

Parameters:

offset - The offset within the memory area to read the longs.

dst - The output array to place the data in.

off - The offset within the array to start copying.

len - The number of longs to read.

put

void put(long offset,
         long[] src,
         int off,
         int len)

Writes an array of longs to the memory area at the specified offset.

Parameters:

offset - The offset within the memory area to start writing the longs.

src - The array to write to the memory area.

off - The offset within the array to start copying.

len - The number of longs to write.

get

void get(long offset,
         float[] dst,
         int off,
         int len)

Reads an array of floats from the memory area at the specified offset.

Parameters:

offset - The offset within the memory area to read the floats.

dst - The output array to place the data in.

off - The offset within the array to start copying.

len - The number of floats to read.

put

void put(long offset,
         float[] src,
         int off,
         int len)

Writes an array of floats to the memory area at the specified offset.

Parameters:

offset - The offset within the memory area to start writing the floats.

src - The array to write to the memory area.

off - The offset within the array to start copying.

len - The number of floats to write.

get

void get(long offset,
         double[] dst,
         int off,
         int len)

Reads an array of doubles from the memory area at the specified offset.

Parameters:

offset - The offset within the memory area to read the doubles.

dst - The output array to place the data in.

off - The offset within the array to start copying.

len - The number of doubles to read.

put

void put(long offset,
         double[] src,
         int off,
         int len)

Writes an array of doubles to the memory area at the specified offset.

Parameters:

offset - The offset within the memory area to start writing the doubles.

src - The array to write to the memory area.

off - The offset within the array to start copying.

len - The number of doubles to write.

indexOf

int indexOf(long offset,
            byte value)

Gets the first index within the memory area of a particular 8 bit value.

Parameters:

offset - The offset within the memory area to start searching.

value - The value to search for.

Returns:

The index of the value, relative to offset.

indexOf

int indexOf(long offset,
            byte value,
            int maxlen)

Gets the first index within the memory area of a particular 8 bit value.

Parameters:

offset - The offset within the memory area to start searching.

value - The value to search for.

Returns:

The index of the value, relative to offset.

setMemory

void setMemory(long offset,
               long size,
               byte value)

Sets the contents of the memory area to the value.

Parameters:

offset - The offset within the memory area to start writing.

size - The number of bytes to set to the value.

value - The value to set each byte to.