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## 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
`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. an ascii or utf-8 string)
`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.

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