import java.io.OutputStream;
/**
- * a utility class for handling little-endian numbers, which the 80x86 world is
- * replete with. The methods are all static, and input/output is from/to byte
- * arrays, or from InputStreams.
- *
- *@author Marc Johnson (mjohnson at apache dot org)
- *@author Andrew Oliver (acoliver at apache dot org)
+ * a utility class for handling little-endian numbers, which the 80x86 world is
+ * replete with. The methods are all static, and input/output is from/to byte
+ * arrays, or from InputStreams.
+ *
+ * @author Marc Johnson (mjohnson at apache dot org)
+ * @author Andrew Oliver (acoliver at apache dot org)
*/
-public class LittleEndian implements LittleEndianConsts {
-
- private LittleEndian() {
- // no instances of this class
- }
+public class LittleEndian implements LittleEndianConsts
+{
/**
- * get a short value from a byte array
- *
- *@param data the byte array
- *@param offset a starting offset into the byte array
- *@return the short (16-bit) value
+ * Exception to handle buffer underruns
+ *
+ * @author Marc Johnson (mjohnson at apache dot org)
*/
- public static short getShort(byte[] data, int offset) {
- int b0 = data[offset] & 0xFF;
- int b1 = data[offset+1] & 0xFF;
- return (short) ((b1 << 8) + (b0 << 0));
- }
+ public static final class BufferUnderrunException extends IOException
+ {
+ BufferUnderrunException()
+ {
+ super( "buffer underrun" );
+ }
+ }
/**
- * get an unsigned short value from a byte array
- *
- *@param data the byte array
- *@param offset a starting offset into the byte array
- *@return the unsigned short (16-bit) value in an integer
+ * Copy a portion of a byte array
+ *
+ * @param data
+ * the original byte array
+ * @param offset
+ * Where to start copying from.
+ * @param size
+ * Number of bytes to copy.
+ * @return The byteArray value
+ * @throws IndexOutOfBoundsException
+ * - if copying would cause access of data outside array bounds.
*/
- public static int getUShort(byte[] data, int offset) {
- int b0 = data[offset] & 0xFF;
- int b1 = data[offset+1] & 0xFF;
- return (b1 << 8) + (b0 << 0);
+ public static byte[] getByteArray( byte[] data, int offset, int size )
+ {
+ byte[] copy = new byte[size];
+ System.arraycopy( data, offset, copy, 0, size );
+
+ return copy;
}
/**
- * get a short value from the beginning of a byte array
- *
- *@param data the byte array
- *@return the short (16-bit) value
+ * get a double value from a byte array, reads it in little endian format
+ * then converts the resulting revolting IEEE 754 (curse them) floating
+ * point number to a happy java double
+ *
+ * @param data
+ * the byte array
+ * @param offset
+ * a starting offset into the byte array
+ * @return the double (64-bit) value
*/
- public static short getShort(byte[] data) {
- return getShort(data, 0);
+ public static double getDouble( byte[] data, int offset )
+ {
+ return Double.longBitsToDouble( getLong( data, offset ) );
}
/**
- * get an unsigned short value from the beginning of a byte array
- *
- *@param data the byte array
- *@return the unsigned short (16-bit) value in an int
+ * get an int value from the beginning of a byte array
+ *
+ * @param data
+ * the byte array
+ * @return the int (32-bit) value
*/
- public static int getUShort(byte[] data) {
- return getUShort(data, 0);
+ public static int getInt( byte[] data )
+ {
+ return getInt( data, 0 );
}
/**
- * get an int value from a byte array
- *
- *@param data the byte array
- *@param offset a starting offset into the byte array
- *@return the int (32-bit) value
+ * get an int value from a byte array
+ *
+ * @param data
+ * the byte array
+ * @param offset
+ * a starting offset into the byte array
+ * @return the int (32-bit) value
*/
- public static int getInt(byte[] data, int offset) {
- int i=offset;
+ public static int getInt( byte[] data, int offset )
+ {
+ int i = offset;
int b0 = data[i++] & 0xFF;
int b1 = data[i++] & 0xFF;
int b2 = data[i++] & 0xFF;
int b3 = data[i++] & 0xFF;
- return (b3 << 24) + (b2 << 16) + (b1 << 8) + (b0 << 0);
+ return ( b3 << 24 ) + ( b2 << 16 ) + ( b1 << 8 ) + ( b0 << 0 );
}
/**
- * get an int value from the beginning of a byte array
- *
- *@param data the byte array
- *@return the int (32-bit) value
+ * get a long value from a byte array
+ *
+ * @param data
+ * the byte array
+ * @param offset
+ * a starting offset into the byte array
+ * @return the long (64-bit) value
*/
- public static int getInt(byte[] data) {
- return getInt(data, 0);
+ public static long getLong( byte[] data, int offset )
+ {
+ long result = 0;
+
+ for ( int j = offset + LONG_SIZE - 1; j >= offset; j-- )
+ {
+ result <<= 8;
+ result |= 0xff & data[j];
+ }
+ return result;
}
+ /**
+ * get a short value from the beginning of a byte array
+ *
+ * @param data
+ * the byte array
+ * @return the short (16-bit) value
+ */
+ public static short getShort( byte[] data )
+ {
+ return getShort( data, 0 );
+ }
/**
- * get an unsigned int value from a byte array
- *
- *@param data the byte array
- *@param offset a starting offset into the byte array
- *@return the unsigned int (32-bit) value in a long
+ * get a short value from a byte array
+ *
+ * @param data
+ * the byte array
+ * @param offset
+ * a starting offset into the byte array
+ * @return the short (16-bit) value
*/
- public static long getUInt(byte[] data, int offset) {
- long retNum = getInt(data, offset);
- return retNum & 0x00FFFFFFFFl;
+ public static short getShort( byte[] data, int offset )
+ {
+ int b0 = data[offset] & 0xFF;
+ int b1 = data[offset + 1] & 0xFF;
+ return (short) ( ( b1 << 8 ) + ( b0 << 0 ) );
}
/**
- * get an unsigned int value from a byte array
- *
- *@param data the byte array
- *@return the unsigned int (32-bit) value in a long
+ * Read short array
+ *
+ * @param data
+ * the original byte array
+ * @param offset
+ * Where to start copying from.
+ * @param size
+ * Number of bytes to copy.
+ * @throws IndexOutOfBoundsException
+ * - if read would cause access of data outside array bounds.
*/
- public static long getUInt(byte[] data) {
- return getUInt(data,0);
+ public static short[] getShortArray( byte[] data, int offset, int size )
+ {
+ short[] result = new short[size / SHORT_SIZE];
+ for ( int i = 0; i < result.length; i++ )
+ {
+ result[i] = getShort( data, offset + i * SHORT_SIZE );
+ }
+ return result;
}
/**
- * get a long value from a byte array
- *
- *@param data the byte array
- *@param offset a starting offset into the byte array
- *@return the long (64-bit) value
+ * get the unsigned value of a byte.
+ *
+ * @param data
+ * the byte array.
+ * @param offset
+ * a starting offset into the byte array.
+ * @return the unsigned value of the byte as a 16 bit short
*/
- public static long getLong(byte[] data, int offset) {
- long result = 0;
+ public static short getUByte( byte[] data, int offset )
+ {
+ return (short) ( data[offset] & 0xFF );
+ }
- for (int j = offset + LONG_SIZE - 1; j >= offset; j--) {
- result <<= 8;
- result |= 0xff & data[j];
- }
- return result;
+ /**
+ * get an unsigned int value from a byte array
+ *
+ * @param data
+ * the byte array
+ * @return the unsigned int (32-bit) value in a long
+ */
+ public static long getUInt( byte[] data )
+ {
+ return getUInt( data, 0 );
}
/**
- * get a double value from a byte array, reads it in little endian format
- * then converts the resulting revolting IEEE 754 (curse them) floating
- * point number to a happy java double
- *
- *@param data the byte array
- *@param offset a starting offset into the byte array
- *@return the double (64-bit) value
+ * get an unsigned int value from a byte array
+ *
+ * @param data
+ * the byte array
+ * @param offset
+ * a starting offset into the byte array
+ * @return the unsigned int (32-bit) value in a long
*/
- public static double getDouble(byte[] data, int offset) {
- return Double.longBitsToDouble(getLong(data, offset));
+ public static long getUInt( byte[] data, int offset )
+ {
+ long retNum = getInt( data, offset );
+ return retNum & 0x00FFFFFFFFl;
}
/**
- * put a short value into a byte array
- *
- *@param data the byte array
- *@param offset a starting offset into the byte array
- *@param value the short (16-bit) value
+ * get the unsigned value of a byte.
+ *
+ * @param data
+ * the byte array.
+ * @param offset
+ * a starting offset into the byte array.
+ * @return the unsigned value of the byte as a 32 bit integer
+ * @deprecated Use {@link #getUByte(byte[], int)} instead
*/
- public static void putShort(byte[] data, int offset, short value) {
- int i = offset;
- data[i++] = (byte)((value >>> 0) & 0xFF);
- data[i++] = (byte)((value >>> 8) & 0xFF);
+ @Deprecated
+ public static int getUnsignedByte( byte[] data, int offset )
+ {
+ return data[offset] & 0xFF;
}
/**
- * executes:<p/>
- * <code>
- * data[offset] = (byte)value;
- * </code></p>
- * Added for consistency with other put~() methods
+ * get an unsigned short value from the beginning of a byte array
+ *
+ * @param data
+ * the byte array
+ * @return the unsigned short (16-bit) value in an int
*/
- public static void putByte(byte[] data, int offset, int value) {
- data[offset] = (byte) value;
+ public static int getUShort( byte[] data )
+ {
+ return getUShort( data, 0 );
}
/**
- * put an unsigned byte value into a byte array
+ * get an unsigned short value from a byte array
*
* @param data
* the byte array
* @param offset
* a starting offset into the byte array
- * @param value
- * the short (16-bit) value
- *
- * @exception ArrayIndexOutOfBoundsException
- * may be thrown
+ * @return the unsigned short (16-bit) value in an integer
*/
- public static void putUByte( byte[] data, int offset, short value )
+ public static int getUShort( byte[] data, int offset )
{
- data[offset] = (byte) ( value & 0xFF );
+ int b0 = data[offset] & 0xFF;
+ int b1 = data[offset + 1] & 0xFF;
+ return ( b1 << 8 ) + ( b0 << 0 );
}
/**
- * put an unsigned short value into a byte array
- *
- * @param data the byte array
- * @param offset a starting offset into the byte array
- * @param value the short (16-bit) value
- *
- * @exception ArrayIndexOutOfBoundsException may be thrown
- */
- public static void putUShort(byte[] data, int offset, int value) {
- int i = offset;
- data[i++] = (byte)((value >>> 0) & 0xFF);
- data[i++] = (byte)((value >>> 8) & 0xFF);
+ * executes:
+ * <p/>
+ * <code>
+ * data[offset] = (byte)value;
+ * </code>
+ * </p>
+ * Added for consistency with other put~() methods
+ */
+ public static void putByte( byte[] data, int offset, int value )
+ {
+ data[offset] = (byte) value;
}
/**
- * put a short value into beginning of a byte array
- *
- *@param data the byte array
- *@param value the short (16-bit) value
+ * put a double value into a byte array
+ *
+ * @param data
+ * the byte array
+ * @param offset
+ * a starting offset into the byte array
+ * @param value
+ * the double (64-bit) value
*/
- public static void putShort(byte[] data, short value) {
- putShort(data, 0, value);
+ public static void putDouble( byte[] data, int offset, double value )
+ {
+ putLong( data, offset, Double.doubleToLongBits( value ) );
}
-
/**
- * put an int value into a byte array
- *
- *@param data the byte array
- *@param offset a starting offset into the byte array
- *@param value the int (32-bit) value
+ * put an int value into beginning of a byte array
+ *
+ * @param data
+ * the byte array
+ * @param value
+ * the int (32-bit) value
*/
- public static void putInt(byte[] data, int offset, int value) {
- int i = offset;
- data[i++] = (byte)((value >>> 0) & 0xFF);
- data[i++] = (byte)((value >>> 8) & 0xFF);
- data[i++] = (byte)((value >>> 16) & 0xFF);
- data[i++] = (byte)((value >>> 24) & 0xFF);
+ public static void putInt( byte[] data, int value )
+ {
+ putInt( data, 0, value );
}
/**
- * put an int value into beginning of a byte array
- *
- *@param data the byte array
- *@param value the int (32-bit) value
+ * put an int value into a byte array
+ *
+ * @param data
+ * the byte array
+ * @param offset
+ * a starting offset into the byte array
+ * @param value
+ * the int (32-bit) value
*/
- public static void putInt(byte[] data, int value) {
- putInt(data, 0, value);
+ public static void putInt( byte[] data, int offset, int value )
+ {
+ int i = offset;
+ data[i++] = (byte) ( ( value >>> 0 ) & 0xFF );
+ data[i++] = (byte) ( ( value >>> 8 ) & 0xFF );
+ data[i++] = (byte) ( ( value >>> 16 ) & 0xFF );
+ data[i++] = (byte) ( ( value >>> 24 ) & 0xFF );
}
/**
}
/**
- * put an unsigned int value into a byte array
- *
- * @param data the byte array
- * @param offset a starting offset into the byte array
- * @param value the int (32-bit) value
- *
- * @exception ArrayIndexOutOfBoundsException may be thrown
- */
- public static void putUInt(byte[] data, int offset, long value) {
+ * put a long value into a byte array
+ *
+ * @param data
+ * the byte array
+ * @param offset
+ * a starting offset into the byte array
+ * @param value
+ * the long (64-bit) value
+ */
+ public static void putLong( byte[] data, int offset, long value )
+ {
+ int limit = LONG_SIZE + offset;
+ long v = value;
+
+ for ( int j = offset; j < limit; j++ )
+ {
+ data[j] = (byte) ( v & 0xFF );
+ v >>= 8;
+ }
+ }
+
+ /**
+ * put a short value into a byte array
+ *
+ * @param data
+ * the byte array
+ * @param offset
+ * a starting offset into the byte array
+ * @param value
+ * the short (16-bit) value
+ */
+ public static void putShort( byte[] data, int offset, short value )
+ {
int i = offset;
- data[i++] = (byte)((value >>> 0) & 0xFF);
- data[i++] = (byte)((value >>> 8) & 0xFF);
- data[i++] = (byte)((value >>> 16) & 0xFF);
- data[i++] = (byte)((value >>> 24) & 0xFF);
+ data[i++] = (byte) ( ( value >>> 0 ) & 0xFF );
+ data[i++] = (byte) ( ( value >>> 8 ) & 0xFF );
}
/**
- * put an unsigned int value into beginning of a byte array
- *
- *@param data the byte array
- *@param value the int (32-bit) value
+ * put a short value into beginning of a byte array
+ *
+ * @param data
+ * the byte array
+ * @param value
+ * the short (16-bit) value
*/
- public static void putUInt(byte[] data, long value) {
- putUInt(data, 0, value);
+ public static void putShort( byte[] data, short value )
+ {
+ putShort( data, 0, value );
}
/**
- * Put unsigned int into output stream
+ * Put signed short into output stream
*
* @param value
- * the int (32-bit) value
+ * the short (16-bit) value
* @param outputStream
* output stream
* @throws IOException
* if an I/O error occurs
*/
- public static void putUInt( long value, OutputStream outputStream )
+ public static void putShort( OutputStream outputStream, short value )
throws IOException
{
outputStream.write( (byte) ( ( value >>> 0 ) & 0xFF ) );
outputStream.write( (byte) ( ( value >>> 8 ) & 0xFF ) );
- outputStream.write( (byte) ( ( value >>> 16 ) & 0xFF ) );
- outputStream.write( (byte) ( ( value >>> 24 ) & 0xFF ) );
}
/**
- * put a long value into a byte array
- *
- *@param data the byte array
- *@param offset a starting offset into the byte array
- *@param value the long (64-bit) value
+ * Stores short array in buffer
+ *
+ * @param data
+ * the byte array
+ * @param offset
+ * a starting offset into the byte array
+ * @param value
+ * the short (16-bit) values
*/
- public static void putLong(byte[] data, int offset, long value) {
- int limit = LONG_SIZE + offset;
- long v = value;
-
- for (int j = offset; j < limit; j++) {
- data[j] = (byte) (v & 0xFF);
- v >>= 8;
+ public static void putShortArray( byte[] data, int offset, short[] value )
+ {
+ for ( short s : value )
+ {
+ putShort( data, offset, s );
+ offset += SHORT_SIZE;
}
}
-
/**
- * put a double value into a byte array
- *
- *@param data the byte array
- *@param offset a starting offset into the byte array
- *@param value the double (64-bit) value
+ * put an unsigned byte value into a byte array
+ *
+ * @param data
+ * the byte array
+ * @param offset
+ * a starting offset into the byte array
+ * @param value
+ * the short (16-bit) value
+ *
+ * @exception ArrayIndexOutOfBoundsException
+ * may be thrown
*/
- public static void putDouble(byte[] data, int offset, double value) {
- putLong(data, offset, Double.doubleToLongBits(value));
+ public static void putUByte( byte[] data, int offset, short value )
+ {
+ data[offset] = (byte) ( value & 0xFF );
}
-
/**
- * Exception to handle buffer underruns
- *
- *@author Marc Johnson (mjohnson at apache dot org)
+ * put an unsigned int value into a byte array
+ *
+ * @param data
+ * the byte array
+ * @param offset
+ * a starting offset into the byte array
+ * @param value
+ * the int (32-bit) value
+ *
+ * @exception ArrayIndexOutOfBoundsException
+ * may be thrown
*/
- public static final class BufferUnderrunException extends IOException {
-
- BufferUnderrunException() {
- super("buffer underrun");
- }
+ public static void putUInt( byte[] data, int offset, long value )
+ {
+ int i = offset;
+ data[i++] = (byte) ( ( value >>> 0 ) & 0xFF );
+ data[i++] = (byte) ( ( value >>> 8 ) & 0xFF );
+ data[i++] = (byte) ( ( value >>> 16 ) & 0xFF );
+ data[i++] = (byte) ( ( value >>> 24 ) & 0xFF );
}
-
/**
- * get a short value from an InputStream
- *
- *@param stream the InputStream from which the short is to be read
- *@return the short (16-bit) value
- *@exception IOException will be propagated back to the caller
- *@exception BufferUnderrunException if the stream cannot provide enough bytes
+ * put an unsigned int value into beginning of a byte array
+ *
+ * @param data
+ * the byte array
+ * @param value
+ * the int (32-bit) value
*/
- public static short readShort(InputStream stream) throws IOException, BufferUnderrunException {
-
- return (short) readUShort(stream);
+ public static void putUInt( byte[] data, long value )
+ {
+ putUInt( data, 0, value );
}
- public static int readUShort(InputStream stream) throws IOException, BufferUnderrunException {
-
- int ch1 = stream.read();
- int ch2 = stream.read();
- if ((ch1 | ch2) < 0) {
- throw new BufferUnderrunException();
- }
- return (ch2 << 8) + (ch1 << 0);
+ /**
+ * Put unsigned int into output stream
+ *
+ * @param value
+ * the int (32-bit) value
+ * @param outputStream
+ * output stream
+ * @throws IOException
+ * if an I/O error occurs
+ */
+ public static void putUInt( long value, OutputStream outputStream )
+ throws IOException
+ {
+ outputStream.write( (byte) ( ( value >>> 0 ) & 0xFF ) );
+ outputStream.write( (byte) ( ( value >>> 8 ) & 0xFF ) );
+ outputStream.write( (byte) ( ( value >>> 16 ) & 0xFF ) );
+ outputStream.write( (byte) ( ( value >>> 24 ) & 0xFF ) );
}
-
/**
- * get an int value from an InputStream
- *
- *@param stream the InputStream from which the int is to be read
- * @return the int (32-bit) value
- * @exception IOException will be propagated back to the caller
- * @exception BufferUnderrunException if the stream cannot provide enough bytes
+ * put an unsigned short value into a byte array
+ *
+ * @param data
+ * the byte array
+ * @param offset
+ * a starting offset into the byte array
+ * @param value
+ * the short (16-bit) value
+ *
+ * @exception ArrayIndexOutOfBoundsException
+ * may be thrown
*/
- public static int readInt(InputStream stream)
- throws IOException, BufferUnderrunException {
+ public static void putUShort( byte[] data, int offset, int value )
+ {
+ int i = offset;
+ data[i++] = (byte) ( ( value >>> 0 ) & 0xFF );
+ data[i++] = (byte) ( ( value >>> 8 ) & 0xFF );
+ }
+
+ /**
+ * get an int value from an InputStream
+ *
+ * @param stream
+ * the InputStream from which the int is to be read
+ * @return the int (32-bit) value
+ * @exception IOException
+ * will be propagated back to the caller
+ * @exception BufferUnderrunException
+ * if the stream cannot provide enough bytes
+ */
+ public static int readInt( InputStream stream ) throws IOException,
+ BufferUnderrunException
+ {
int ch1 = stream.read();
int ch2 = stream.read();
int ch3 = stream.read();
int ch4 = stream.read();
- if ((ch1 | ch2 | ch3 | ch4) < 0) {
+ if ( ( ch1 | ch2 | ch3 | ch4 ) < 0 )
+ {
throw new BufferUnderrunException();
}
- return (ch4 << 24) + (ch3<<16) + (ch2 << 8) + (ch1 << 0);
+ return ( ch4 << 24 ) + ( ch3 << 16 ) + ( ch2 << 8 ) + ( ch1 << 0 );
}
-
/**
- * get a long value from an InputStream
- *
- * @param stream the InputStream from which the long is to be read
- * @return the long (64-bit) value
- * @exception IOException will be propagated back to the caller
- * @exception BufferUnderrunException if the stream cannot provide enough bytes
- */
- public static long readLong(InputStream stream)
- throws IOException, BufferUnderrunException {
+ * get a long value from an InputStream
+ *
+ * @param stream
+ * the InputStream from which the long is to be read
+ * @return the long (64-bit) value
+ * @exception IOException
+ * will be propagated back to the caller
+ * @exception BufferUnderrunException
+ * if the stream cannot provide enough bytes
+ */
+ public static long readLong( InputStream stream ) throws IOException,
+ BufferUnderrunException
+ {
int ch1 = stream.read();
int ch2 = stream.read();
int ch3 = stream.read();
int ch6 = stream.read();
int ch7 = stream.read();
int ch8 = stream.read();
- if ((ch1 | ch2 | ch3 | ch4 | ch5 | ch6 | ch7 | ch8) < 0) {
+ if ( ( ch1 | ch2 | ch3 | ch4 | ch5 | ch6 | ch7 | ch8 ) < 0 )
+ {
throw new BufferUnderrunException();
}
- return
- ((long)ch8 << 56) +
- ((long)ch7 << 48) +
- ((long)ch6 << 40) +
- ((long)ch5 << 32) +
- ((long)ch4 << 24) + // cast to long to preserve bit 31 (sign bit for ints)
- (ch3 << 16) +
- (ch2 << 8) +
- (ch1 << 0);
+ return ( (long) ch8 << 56 ) + ( (long) ch7 << 48 )
+ + ( (long) ch6 << 40 ) + ( (long) ch5 << 32 )
+ + ( (long) ch4 << 24 ) + // cast to long to preserve bit 31
+ // (sign bit for ints)
+ ( ch3 << 16 ) + ( ch2 << 8 ) + ( ch1 << 0 );
}
/**
- * Convert an 'unsigned' byte to an integer. ie, don't carry across the
- * sign.
- *
- * @param b Description of the Parameter
- * @return Description of the Return Value
- */
- public static int ubyteToInt(byte b) {
- return b & 0xFF;
- }
-
-
- /**
- * get the unsigned value of a byte.
- *
- * @param data the byte array.
- * @param offset a starting offset into the byte array.
- * @return the unsigned value of the byte as a 32 bit integer
- * @deprecated Use {@link #getUByte(byte[], int)} instead
- */
- @Deprecated
- public static int getUnsignedByte(byte[] data, int offset) {
- return data[offset] & 0xFF;
- }
-
- /**
- * get the unsigned value of a byte.
+ * get a short value from an InputStream
*
- * @param data
- * the byte array.
- * @param offset
- * a starting offset into the byte array.
- * @return the unsigned value of the byte as a 16 bit short
- */
- public static short getUByte( byte[] data, int offset )
+ * @param stream
+ * the InputStream from which the short is to be read
+ * @return the short (16-bit) value
+ * @exception IOException
+ * will be propagated back to the caller
+ * @exception BufferUnderrunException
+ * if the stream cannot provide enough bytes
+ */
+ public static short readShort( InputStream stream ) throws IOException,
+ BufferUnderrunException
{
- return (short) ( data[offset] & 0xFF );
+ return (short) readUShort( stream );
}
- /**
- * Copy a portion of a byte array
- *
- * @param data the original byte array
- * @param offset Where to start copying from.
- * @param size Number of bytes to copy.
- * @return The byteArray value
- * @throws IndexOutOfBoundsException - if copying would cause access of
- * data outside array bounds.
- */
- public static byte[] getByteArray(byte[] data, int offset, int size) {
- byte[] copy = new byte[size];
- System.arraycopy(data, offset, copy, 0, size);
-
- return copy;
- }
-
- /**
- * Read short array
- *
- * @param data the original byte array
- * @param offset Where to start copying from.
- * @param size Number of bytes to copy.
- * @throws IndexOutOfBoundsException
- * - if read would cause access of data outside array bounds.
- */
- public static short[] getShortArray( byte[] data, int offset, int size )
+ public static int readUShort( InputStream stream ) throws IOException,
+ BufferUnderrunException
{
- short[] result = new short[size / SHORT_SIZE];
- for ( int i = 0; i < result.length; i++ )
+ int ch1 = stream.read();
+ int ch2 = stream.read();
+ if ( ( ch1 | ch2 ) < 0 )
{
- result[i] = getShort( data, offset + i * SHORT_SIZE );
+ throw new BufferUnderrunException();
}
- return result;
+ return ( ch2 << 8 ) + ( ch1 << 0 );
}
/**
- * Stores short array in buffer
+ * Convert an 'unsigned' byte to an integer. ie, don't carry across the
+ * sign.
*
- * @param data
- * the byte array
- * @param offset
- * a starting offset into the byte array
- * @param value
- * the short (16-bit) values
+ * @param b
+ * Description of the Parameter
+ * @return Description of the Return Value
*/
- public static void putShortArray( byte[] data, int offset, short[] value )
+ public static int ubyteToInt( byte b )
{
- for ( short s : value )
- {
- putShort( data, offset, s );
- offset += SHORT_SIZE;
- }
+ return b & 0xFF;
+ }
+
+ private LittleEndian()
+ {
+ // no instances of this class
}
}
projects / poi.git / commitdiff