Package org.python.modules.jffi

Class HeapMemory

java.lang.Object
org.python.modules.jffi.HeapMemory
All Implemented Interfaces:
Memory
public final class HeapMemory extends Object implements Memory

  • Constructor Summary

    Constructors
    Constructor
    Description
    HeapMemory(byte[] buffer, int offset, int length)
     
    HeapMemory(int size)
     

  • Method Summary

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

    Methods inherited from class java.lang.Object

    equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • HeapMemory

      public HeapMemory(byte[] buffer, int offset, int length)

    • HeapMemory

      public HeapMemory(int size)

  • Method Details

    • array

      public final byte[] array()

    • arrayOffset

      public final int arrayOffset()

    • arrayLength

      public final int arrayLength()

    • isNull

      public final boolean isNull()
      Description copied from interface: Memory
      Checks if the memory area is NULL.
      Specified by:
      isNull in interface Memory
      Returns:
      true if the memory area is invalid.

    • isDirect

      public final boolean isDirect()
      Description copied from interface: Memory
      Checks if the memory area is a native memory pointer.
      Specified by:
      isDirect in interface Memory
      Returns:
      true if the memory area is a native pointer.

    • slice

      public HeapMemory slice(long offset)
      Description copied from interface: Memory
      Creates a new MemoryIO pointing to a subset of the memory area of this MemoryIO.
      Specified by:
      slice in interface Memory
      Parameters:
      offset - The offset within the existing memory area to start the new MemoryIO at.
      Returns:
      A MemoryIO instance.

    • getMemory

      public final DirectMemory getMemory(long offset)
      Description copied from interface: Memory
      Reads a pointer value at the specified offset within the memory area, and wraps it in an abstract memory accessor.
      Specified by:
      getMemory in interface Memory
      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.

    • putAddress

      public final void putAddress(long offset, Memory value)
      Description copied from interface: Memory
      Writes a pointer value to the memory area at the specified offset.
      Specified by:
      putAddress in interface Memory
      Parameters:
      offset - The offset within the memory area to write the value.
      value - The pointer value to write to the memory location.

    • getByte

      public final byte getByte(long offset)
      Description copied from interface: Memory
      Reads an 8 bit integer value from the memory area.
      Specified by:
      getByte in interface Memory
      Parameters:
      offset - The offset within the memory area to read the value.
      Returns:
      The 8 bit integer value read from offset

    • getShort

      public final short getShort(long offset)
      Description copied from interface: Memory
      Reads a 16 bit integer value from the memory area.
      Specified by:
      getShort in interface Memory
      Parameters:
      offset - The offset within the memory area to read the value.
      Returns:
      The 16 bit integer value read from offset

    • getInt

      public final int getInt(long offset)
      Description copied from interface: Memory
      Reads a 32 bit integer value from the memory area.
      Specified by:
      getInt in interface Memory
      Parameters:
      offset - The offset within the memory area to read the value.
      Returns:
      The 32 bit integer value read from offset

    • getLong

      public final long getLong(long offset)
      Description copied from interface: Memory
      Reads a 64 bit integer value from the memory area.
      Specified by:
      getLong in interface Memory
      Parameters:
      offset - The offset within the memory area to read the value.
      Returns:
      The 64 bit integer value read from offset

    • getNativeLong

      public final long getNativeLong(long offset)
      Description copied from interface: Memory
      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.

      Specified by:
      getNativeLong in interface Memory
      Parameters:
      offset - The offset within the memory area to read the value.
      Returns:
      The native long value read from offset

    • getFloat

      public final float getFloat(long offset)
      Description copied from interface: Memory
      Reads a float value from the memory area.
      Specified by:
      getFloat in interface Memory
      Parameters:
      offset - The offset within the memory area to read the value.
      Returns:
      The float value read from offset

    • getDouble

      public final double getDouble(long offset)
      Description copied from interface: Memory
      Reads a double value from the memory area.
      Specified by:
      getDouble in interface Memory
      Parameters:
      offset - The offset within the memory area to read the value.
      Returns:
      The double value read from offset

    • getAddress

      public final long getAddress(long offset)
      Description copied from interface: Memory
      Reads a pointer value at the specified offset within the memory area.
      Specified by:
      getAddress in interface Memory
      Parameters:
      offset - The offset within the memory area to read the value.
      Returns:
      A long value that represents the address.

    • getZeroTerminatedByteArray

      public final byte[] getZeroTerminatedByteArray(long offset)
      Description copied from interface: Memory
      Reads a zero terminated byte array (e.g. an ascii or utf-8 string)
      Specified by:
      getZeroTerminatedByteArray in interface Memory
      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

      public final void putByte(long offset, byte value)
      Description copied from interface: Memory
      Writes an 8 bit integer value to the memory area at the specified offset.
      Specified by:
      putByte in interface Memory
      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

      public final void putShort(long offset, short value)
      Description copied from interface: Memory
      Writes a 16 bit integer value to the memory area at the specified offset.
      Specified by:
      putShort in interface Memory
      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

      public final void putInt(long offset, int value)
      Description copied from interface: Memory
      Writes a 32 bit integer value to the memory area at the specified offset.
      Specified by:
      putInt in interface Memory
      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

      public final void putLong(long offset, long value)
      Description copied from interface: Memory
      Writes a 64 bit integer value to the memory area at the specified offset.
      Specified by:
      putLong in interface Memory
      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

      public final void putNativeLong(long offset, long value)
      Description copied from interface: Memory
      Writes a native long integer value to the memory area at the specified offset.
      Specified by:
      putNativeLong in interface Memory
      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

      public final void putFloat(long offset, float value)
      Description copied from interface: Memory
      Writes a 32 bit float value to the memory area at the specified offset.
      Specified by:
      putFloat in interface Memory
      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

      public final void putDouble(long offset, double value)
      Description copied from interface: Memory
      Writes a 64 bit float value to the memory area at the specified offset.
      Specified by:
      putDouble in interface Memory
      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

      public final void putAddress(long offset, long value)
      Description copied from interface: Memory
      Writes a pointer value to the memory area at the specified offset.
      Specified by:
      putAddress in interface Memory
      Parameters:
      offset - The offset within the memory area to write the value.
      value - The pointer value to write to the memory location.

    • putZeroTerminatedByteArray

      public void putZeroTerminatedByteArray(long offset, byte[] bytes, int off, int len)
      Description copied from interface: Memory
      Writes a byte array to memory, and appends a zero terminator
      Specified by:
      putZeroTerminatedByteArray in interface Memory
      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

      public final void get(long offset, byte[] dst, int off, int len)
      Description copied from interface: Memory
      Reads an array of bytes from the memory area at the specified offset.
      Specified by:
      get in interface Memory
      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

      public final void put(long offset, byte[] src, int off, int len)
      Description copied from interface: Memory
      Writes an array of bytes to the memory area at the specified offset.
      Specified by:
      put in interface Memory
      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

      public final void get(long offset, short[] dst, int off, int len)
      Description copied from interface: Memory
      Reads an array of shorts from the memory area at the specified offset.
      Specified by:
      get in interface Memory
      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

      public final void put(long offset, short[] src, int off, int len)
      Description copied from interface: Memory
      Writes an array of shorts to the memory area at the specified offset.
      Specified by:
      put in interface Memory
      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

      public final void get(long offset, int[] dst, int off, int len)
      Description copied from interface: Memory
      Reads an array of ints from the memory area at the specified offset.
      Specified by:
      get in interface Memory
      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

      public final void put(long offset, int[] src, int off, int len)
      Description copied from interface: Memory
      Writes an array of ints to the memory area at the specified offset.
      Specified by:
      put in interface Memory
      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

      public final void get(long offset, long[] dst, int off, int len)
      Description copied from interface: Memory
      Reads an array of longs from the memory area at the specified offset.
      Specified by:
      get in interface Memory
      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

      public final void put(long offset, long[] src, int off, int len)
      Description copied from interface: Memory
      Writes an array of longs to the memory area at the specified offset.
      Specified by:
      put in interface Memory
      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

      public final void get(long offset, float[] dst, int off, int len)
      Description copied from interface: Memory
      Reads an array of floats from the memory area at the specified offset.
      Specified by:
      get in interface Memory
      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

      public final void put(long offset, float[] src, int off, int len)
      Description copied from interface: Memory
      Writes an array of floats to the memory area at the specified offset.
      Specified by:
      put in interface Memory
      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

      public final void get(long offset, double[] dst, int off, int len)
      Description copied from interface: Memory
      Reads an array of doubles from the memory area at the specified offset.
      Specified by:
      get in interface Memory
      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

      public final void put(long offset, double[] src, int off, int len)
      Description copied from interface: Memory
      Writes an array of doubles to the memory area at the specified offset.
      Specified by:
      put in interface Memory
      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

      public final int indexOf(long offset, byte value)
      Description copied from interface: Memory
      Gets the first index within the memory area of a particular 8 bit value.
      Specified by:
      indexOf in interface Memory
      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

      public final int indexOf(long offset, byte value, int maxlen)
      Description copied from interface: Memory
      Gets the first index within the memory area of a particular 8 bit value.
      Specified by:
      indexOf in interface Memory
      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

      public final void setMemory(long offset, long size, byte value)
      Description copied from interface: Memory
      Sets the contents of the memory area to the value.
      Specified by:
      setMemory in interface Memory
      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.

    • clear

      public final void clear()