Package org.hortonmachine.gears.io.dxfdwg.libs.dwg

Class DwgUtil

  • public final class DwgUtil
extends Object
    The DwgUtil class contains the essential set of functions for reading bitstreams in DWG files
    Author:
    jmorell

    • Constructor Summary

      Constructors 
      Constructor Description
      DwgUtil()  

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static int[] bytesToMachineBytes​(byte[] data)
      Convert bytes to machine value bytes
      static Vector getBitDouble​(int[] data, int offset)
      Read a double value from a group of unsigned bytes
      static Vector getBitLong​(int[] data, int offset)
      Read a long value from a group of unsigned bytes
      static Object getBits​(int[] data, int count, int offset)
      Returns a set of bits from a group of unsigned bytes
      static Vector getBitShort​(int[] data, int offset)
      Read a short value from a group of unsigned bytes
      static Vector getDefaultDouble​(int[] data, int offset, double defVal)
      Read a double value from a group of unsigned bytes and a default double
      static Vector getHandle​(int[] data, int offset)
      Read a int value (the handle of a DWG object) from a group of unsigned bytes
      static Vector getModularChar​(int[] data, int offset)
      Read a char value from a group of unsigned bytes
      static int getModularShort​(ByteBuffer bb)
      Read a int value (the size of a modular short) from a ByteBuffer
      static Vector getRawChar​(int[] data, int offset)
      Read a char value from a group of unsigned bytes
      static Vector getRawDouble​(int[] data, int offset)
      Read a double value from a group of unsigned bytes
      static Vector getRawLong​(int[] data, int offset)
      Read a long value from a group of unsigned bytes
      static Vector getRawShort​(int[] data, int offset)
      Read a short value from a group of unsigned bytes
      static Vector getTextString​(int[] data, int offset)
      Read a String from a group of unsigned bytes
      static int handleBinToHandleInt​(Vector layerHandle)
      Obtain the int value of a handle given in binary format
      static Vector readExtendedData​(int[] data, int offset)
      Read the extended data for a DWG object Don't use in this version.
      static Vector testBit​(int[] data, int offset)
      Test a bit obtained from a set of unsigned bytes

    • Constructor Detail

      • DwgUtil

        public DwgUtil()

    • Method Detail

      • readExtendedData

        public static Vector readExtendedData​(int[] data,
                                      int offset)
                               throws Exception
        Read the extended data for a DWG object Don't use in this version. Serious bugs detected
        Parameters:
        data - Array of unsigned bytes obtained from the DWG binary file
        offset - The current bit offset where the value begins
        Returns:
        Vector This vector has two parts. First is an int value that represents the new offset, and second is the extended data of a DWG object
        Throws:
        Exception - If an unexpected bit value is found in the DWG file. Occurs when we are looking for LwPolylines.

      • getDefaultDouble

        public static Vector getDefaultDouble​(int[] data,
                                      int offset,
                                      double defVal)
                               throws Exception
        Read a double value from a group of unsigned bytes and a default double
        Parameters:
        data - Array of unsigned bytes obtained from the DWG binary file
        offset - The current bit offset where the value begins
        defVal - Default double value
        Returns:
        Vector This vector has two parts. First is an int value that represents the new offset, and second is the double value
        Throws:
        Exception - If an unexpected bit value is found in the DWG file. Occurs when we are looking for LwPolylines.

      • getBitDouble

        public static Vector getBitDouble​(int[] data,
                                  int offset)
                           throws Exception
        Read a double value from a group of unsigned bytes
        Parameters:
        data - Array of unsigned bytes obtained from the DWG binary file
        offset - The current bit offset where the value begins
        Returns:
        Vector This vector has two parts. First is an int value that represents the new offset, and second is the double value
        Throws:
        Exception - If an unexpected bit value is found in the DWG file. Occurs when we are looking for LwPolylines.

      • getRawDouble

        public static Vector getRawDouble​(int[] data,
                                  int offset)
                           throws Exception
        Read a double value from a group of unsigned bytes
        Parameters:
        data - Array of unsigned bytes obtained from the DWG binary file
        offset - The current bit offset where the value begins
        Returns:
        Vector This vector has two parts. First is an int value that represents the new offset, and second is the double value
        Throws:
        Exception - If an unexpected bit value is found in the DWG file. Occurs when we are looking for LwPolylines.

      • getBitShort

        public static Vector getBitShort​(int[] data,
                                 int offset)
                          throws Exception
        Read a short value from a group of unsigned bytes
        Parameters:
        data - Array of unsigned bytes obtained from the DWG binary file
        offset - The current bit offset where the value begins
        Returns:
        Vector This vector has two parts. First is an int value that represents the new offset, and second is the short value
        Throws:
        Exception - If an unexpected bit value is found in the DWG file. Occurs when we are looking for LwPolylines.

      • getRawShort

        public static Vector getRawShort​(int[] data,
                                 int offset)
                          throws Exception
        Read a short value from a group of unsigned bytes
        Parameters:
        data - Array of unsigned bytes obtained from the DWG binary file
        offset - The current bit offset where the value begins
        Returns:
        Vector This vector has two parts. First is an int value that represents the new offset, and second is the short value
        Throws:
        Exception - If an unexpected bit value is found in the DWG file. Occurs when we are looking for LwPolylines.

      • getBitLong

        public static Vector getBitLong​(int[] data,
                                int offset)
                         throws Exception
        Read a long value from a group of unsigned bytes
        Parameters:
        data - Array of unsigned bytes obtained from the DWG binary file
        offset - The current bit offset where the value begins
        Returns:
        Vector This vector has two parts. First is an int value that represents the new offset, and second is the long value
        Throws:
        Exception - If an unexpected bit value is found in the DWG file. Occurs when we are looking for LwPolylines.

      • getRawLong

        public static Vector getRawLong​(int[] data,
                                int offset)
        Read a long value from a group of unsigned bytes
        Parameters:
        data - Array of unsigned bytes obtained from the DWG binary file
        offset - The current bit offset where the value begins
        Returns:
        Vector This vector has two parts. First is an int value that represents the new offset, and second is the long value
        Throws:
        Exception - If an unexpected bit value is found in the DWG file. Occurs when we are looking for LwPolylines.

      • getRawChar

        public static Vector getRawChar​(int[] data,
                                int offset)
                         throws Exception
        Read a char value from a group of unsigned bytes
        Parameters:
        data - Array of unsigned bytes obtained from the DWG binary file
        offset - The current bit offset where the value begins
        Returns:
        Vector This vector has two parts. First is an int value that represents the new offset, and second is the char value
        Throws:
        Exception - If an unexpected bit value is found in the DWG file. Occurs when we are looking for LwPolylines.

      • getModularChar

        public static Vector getModularChar​(int[] data,
                                    int offset)
                             throws Exception
        Read a char value from a group of unsigned bytes
        Parameters:
        data - Array of unsigned bytes obtained from the DWG binary file
        offset - The current bit offset where the value begins
        Returns:
        Vector This vector has two parts. First is an int value that represents the new offset, and second is the char value
        Throws:
        Exception - If an unexpected bit value is found in the DWG file. Occurs when we are looking for LwPolylines.

      • getTextString

        public static Vector getTextString​(int[] data,
                                   int offset)
                            throws Exception
        Read a String from a group of unsigned bytes
        Parameters:
        data - Array of unsigned bytes obtained from the DWG binary file
        offset - The current bit offset where the value begins
        Returns:
        Vector This vector has two parts. First is an int value that represents the new offset, and second is the String
        Throws:
        Exception - If an unexpected bit value is found in the DWG file. Occurs when we are looking for LwPolylines.

      • getHandle

        public static Vector getHandle​(int[] data,
                               int offset)
                        throws Exception
        Read a int value (the handle of a DWG object) from a group of unsigned bytes
        Parameters:
        data - Array of unsigned bytes obtained from the DWG binary file
        offset - The current bit offset where the value begins
        Returns:
        Vector This vector has two parts. First is an int value that represents the new offset, and second is the int value (handle of a DWG object)
        Throws:
        Exception - If an unexpected bit value is found in the DWG file. Occurs when we are looking for LwPolylines.

      • getModularShort

        public static int getModularShort​(ByteBuffer bb)
        Read a int value (the size of a modular short) from a ByteBuffer
        Parameters:
        bb - Data given as a ByteBuffer
        Returns:
        int Size of the modular short

      • getBits

        public static Object getBits​(int[] data,
                             int count,
                             int offset)
                      throws Exception
        Returns a set of bits from a group of unsigned bytes
        Parameters:
        data - Array of unsigned bytes obtained from the DWG binary file
        count - Bit counter
        offset - The current bit offset where the value begins
        Returns:
        This method returns an array of bytes or an int value
        Throws:
        Exception - If an unexpected bit value is found in the DWG file. Occurs when we are looking for LwPolylines.

      • testBit

        public static Vector testBit​(int[] data,
                             int offset)
        Test a bit obtained from a set of unsigned bytes
        Parameters:
        data - Array of unsigned bytes obtained from the DWG binary file
        offset - The current bit offset where the value begins
        Returns:
        Vector This vector has two parts. First is an int value that represents the new offset, and second is a bit flag

      • bytesToMachineBytes

        public static int[] bytesToMachineBytes​(byte[] data)
        Convert bytes to machine value bytes
        Parameters:
        data - Input of array of bytes
        Returns:
        int[] Output of array of machine bytes

      • handleBinToHandleInt

        public static int handleBinToHandleInt​(Vector layerHandle)
        Obtain the int value of a handle given in binary format
        Parameters:
        layerHandle - Handle in binary format
        Returns:
        int Int value of the handle