DwgUtil

java.lang.Object
- org.gvsig.dwg.lib.DwgUtil

```
public final class DwgUtil
extends Object
```
The DwgUtil class contains the essential set of functions for reading bitstreams in DWG files

Constructor Summary

Constructors
Constructor and Description

DwgUtil()

Constructors
Constructor and Description
`DwgUtil()`

Method Summary

Methods
Modifier and Type	Method and Description
`static int[]`	`bytesToMachineBytes(byte[] data)` Convert bytes to machine value bytes
`static ArrayList`	`getBitDouble(int[] data, int offset)` Read a double value from a group of unsigned bytes
`static ArrayList`	`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 ArrayList`	`getBitShort(int[] data, int offset)` Read a short value from a group of unsigned bytes
`static ArrayList`	`getCmColor(int[] intData, int offset, String version)` Read a CmColor from a group of unsigned bytes
`static ArrayList`	`getDefaultDouble(int[] data, int offset, double defVal)` Read a double value from a group of unsigned bytes and a default double
`static ArrayList`	`getHandle(int[] data, int offset)` Read a int value (the handle of a DWG object) from a group of unsigned bytes
`static ArrayList`	`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 ArrayList`	`getRawChar(int[] data, int offset)` Read a char value from a group of unsigned bytes
`static ArrayList`	`getRawDouble(int[] data, int offset)` Read a double value from a group of unsigned bytes
`static ArrayList`	`getRawLong(int[] data, int offset)` Read a long value from a group of unsigned bytes
`static ArrayList`	`getRawShort(int[] data, int offset)` Read a short value from a group of unsigned bytes
`static ArrayList`	`getTextString(int[] data, int offset)` Read a String from a group of unsigned bytes
`static int`	`handleBinToHandleInt(ArrayList layerHandle)` Obtain the int value of a handle given in binary format
`static int`	`handleToInt(List fromGetHandle)` It receives the list procedent from getHandle method, and return the handle as int
`static ArrayList`	`readExtendedData(int[] data, int offset)` Read the extended data for a DWG object Don't use in this version.
`static ArrayList`	`testBit(int[] data, int offset)` Test a bit obtained from a set of unsigned bytes
`static int[]`	`toIntArray(byte[] bytes)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - DwgUtil
```
public DwgUtil()
```
- Method Detail
  - readExtendedData
```
public static ArrayList readExtendedData(int[] data,
                         int offset)
                                  throws RuntimeException
```
    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:
    ArrayList This ArrayList has two parts. First is an int value that represents the new offset, and second is the extended data of a DWG object
    
    Throws:
    
    RuntimeException - If an unexpected bit value is found in the DWG file. Occurs when we are looking for LwPolylines.
  - getDefaultDouble
```
public static ArrayList getDefaultDouble(int[] data,
                         int offset,
                         double defVal)
                                  throws RuntimeException
```
    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:
    ArrayList This ArrayList has two parts. First is an int value that represents the new offset, and second is the double value
    
    Throws:
    
    RuntimeException - If an unexpected bit value is found in the DWG file. Occurs when we are looking for LwPolylines.
  - getBitDouble
```
public static ArrayList getBitDouble(int[] data,
                     int offset)
                              throws RuntimeException
```
    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:
    ArrayList This ArrayList has two parts. First is an int value that represents the new offset, and second is the double value
    
    Throws:
    
    RuntimeException - If an unexpected bit value is found in the DWG file. Occurs when we are looking for LwPolylines.
  - getRawDouble
```
public static ArrayList getRawDouble(int[] data,
                     int offset)
                              throws RuntimeException
```
    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:
    ArrayList This ArrayList has two parts. First is an int value that represents the new offset, and second is the double value
    
    Throws:
    
    RuntimeException - If an unexpected bit value is found in the DWG file. Occurs when we are looking for LwPolylines.
  - getBitShort
```
public static ArrayList getBitShort(int[] data,
                    int offset)
                             throws RuntimeException
```
    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:
    ArrayList This ArrayList has two parts. First is an int value that represents the new offset, and second is the short value
    
    Throws:
    
    RuntimeException - If an unexpected bit value is found in the DWG file. Occurs when we are looking for LwPolylines.
  - getRawShort
```
public static ArrayList getRawShort(int[] data,
                    int offset)
                             throws RuntimeException
```
    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:
    ArrayList This ArrayList has two parts. First is an int value that represents the new offset, and second is the short value
    
    Throws:
    
    RuntimeException - If an unexpected bit value is found in the DWG file. Occurs when we are looking for LwPolylines.
  - getBitLong
```
public static ArrayList getBitLong(int[] data,
                   int offset)
                            throws RuntimeException
```
    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:
    ArrayList This ArrayList has two parts. First is an int value that represents the new offset, and second is the long value
    
    Throws:
    
    RuntimeException - If an unexpected bit value is found in the DWG file. Occurs when we are looking for LwPolylines.
  - getRawLong
```
public static ArrayList getRawLong(int[] data,
                   int offset)
                            throws RuntimeException
```
    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:
    ArrayList This ArrayList has two parts. First is an int value that represents the new offset, and second is the long value
    
    Throws:
    
    RuntimeException - If an unexpected bit value is found in the DWG file. Occurs when we are looking for LwPolylines.
    
    RuntimeException
  - getRawChar
```
public static ArrayList getRawChar(int[] data,
                   int offset)
                            throws RuntimeException
```
    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:
    ArrayList This ArrayList has two parts. First is an int value that represents the new offset, and second is the char value
    
    Throws:
    
    RuntimeException - If an unexpected bit value is found in the DWG file. Occurs when we are looking for LwPolylines.
  - getModularChar
```
public static ArrayList getModularChar(int[] data,
                       int offset)
                                throws RuntimeException
```
    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:
    ArrayList This ArrayList has two parts. First is an int value that represents the new offset, and second is the char value
    
    Throws:
    
    RuntimeException - If an unexpected bit value is found in the DWG file. Occurs when we are looking for LwPolylines.
  - getTextString
```
public static ArrayList getTextString(int[] data,
                      int offset)
                               throws RuntimeException
```
    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:
    ArrayList This ArrayList has two parts. First is an int value that represents the new offset, and second is the String
    
    Throws:
    
    RuntimeException - If an unexpected bit value is found in the DWG file. Occurs when we are looking for LwPolylines.
  - getCmColor
```
public static ArrayList getCmColor(int[] intData,
                   int offset,
                   String version)
                            throws RuntimeException
```
    Read a CmColor 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:
    ArrayList This ArrayList 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:
    
    RuntimeException - If an unexpected bit value is found in the DWG file. Occurs when we are looking for LwPolylines.
  - getHandle
```
public static ArrayList getHandle(int[] data,
                  int offset)
                           throws RuntimeException
```
    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:
    ArrayList This ArrayList 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:
    
    RuntimeException - 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 RuntimeException
```
    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:
    
    RuntimeException - If an unexpected bit value is found in the DWG file. Occurs when we are looking for LwPolylines.
  - testBit
```
public static ArrayList 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:
    ArrayList This ArrayList 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
  - handleToInt
```
public static int handleToInt(List fromGetHandle)
```
    It receives the list procedent from getHandle method, and return the handle as int
  - handleBinToHandleInt
```
public static int handleBinToHandleInt(ArrayList 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
  - toIntArray
```
public static int[] toIntArray(byte[] bytes)
```

Class DwgUtil

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

DwgUtil

Method Detail

readExtendedData

getDefaultDouble

getBitDouble

getRawDouble

getBitShort

getRawShort

getBitLong

getRawLong

getRawChar

getModularChar

getTextString

getCmColor

getHandle

getModularShort

getBits

testBit

bytesToMachineBytes

handleToInt

handleBinToHandleInt

toIntArray