mirror of https://github.com/apache/poi.git
code format and sort members (prepare for double and float additions)
git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1187537 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Sergey Vladimirov
parent
2490ebd2ff
commit
f7c5b23e6a
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@ -22,236 +22,313 @@ import java.io.InputStream;
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import java.io.OutputStream;
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/**
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* a utility class for handling little-endian numbers, which the 80x86 world is
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* replete with. The methods are all static, and input/output is from/to byte
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* arrays, or from InputStreams.
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*
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*@author Marc Johnson (mjohnson at apache dot org)
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*@author Andrew Oliver (acoliver at apache dot org)
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* a utility class for handling little-endian numbers, which the 80x86 world is
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* replete with. The methods are all static, and input/output is from/to byte
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* arrays, or from InputStreams.
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*
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* @author Marc Johnson (mjohnson at apache dot org)
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* @author Andrew Oliver (acoliver at apache dot org)
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*/
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public class LittleEndian implements LittleEndianConsts {
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public class LittleEndian implements LittleEndianConsts
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{
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private LittleEndian() {
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// no instances of this class
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/**
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* Exception to handle buffer underruns
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*
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* @author Marc Johnson (mjohnson at apache dot org)
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*/
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public static final class BufferUnderrunException extends IOException
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{
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BufferUnderrunException()
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{
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super( "buffer underrun" );
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}
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}
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/**
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* get a short value from a byte array
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*
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*@param data the byte array
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*@param offset a starting offset into the byte array
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*@return the short (16-bit) value
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* Copy a portion of a byte array
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*
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* @param data
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* the original byte array
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* @param offset
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* Where to start copying from.
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* @param size
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* Number of bytes to copy.
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* @return The byteArray value
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* @throws IndexOutOfBoundsException
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* - if copying would cause access of data outside array bounds.
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*/
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public static short getShort(byte[] data, int offset) {
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int b0 = data[offset] & 0xFF;
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int b1 = data[offset+1] & 0xFF;
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return (short) ((b1 << 8) + (b0 << 0));
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}
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public static byte[] getByteArray( byte[] data, int offset, int size )
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{
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byte[] copy = new byte[size];
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System.arraycopy( data, offset, copy, 0, size );
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/**
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* get an unsigned short value from a byte array
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*
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*@param data the byte array
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*@param offset a starting offset into the byte array
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*@return the unsigned short (16-bit) value in an integer
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*/
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public static int getUShort(byte[] data, int offset) {
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int b0 = data[offset] & 0xFF;
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int b1 = data[offset+1] & 0xFF;
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return (b1 << 8) + (b0 << 0);
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return copy;
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}
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/**
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* get a short value from the beginning of a byte array
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*
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*@param data the byte array
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*@return the short (16-bit) value
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* get a double value from a byte array, reads it in little endian format
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* then converts the resulting revolting IEEE 754 (curse them) floating
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* point number to a happy java double
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*
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* @param data
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* the byte array
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* @param offset
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* a starting offset into the byte array
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* @return the double (64-bit) value
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*/
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public static short getShort(byte[] data) {
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return getShort(data, 0);
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public static double getDouble( byte[] data, int offset )
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{
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return Double.longBitsToDouble( getLong( data, offset ) );
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}
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/**
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* get an unsigned short value from the beginning of a byte array
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*
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*@param data the byte array
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*@return the unsigned short (16-bit) value in an int
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* get an int value from the beginning of a byte array
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*
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* @param data
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* the byte array
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* @return the int (32-bit) value
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*/
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public static int getUShort(byte[] data) {
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return getUShort(data, 0);
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public static int getInt( byte[] data )
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{
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return getInt( data, 0 );
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}
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/**
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* get an int value from a byte array
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*
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*@param data the byte array
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*@param offset a starting offset into the byte array
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*@return the int (32-bit) value
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* get an int value from a byte array
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*
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* @param data
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* the byte array
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* @param offset
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* a starting offset into the byte array
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* @return the int (32-bit) value
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*/
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public static int getInt(byte[] data, int offset) {
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int i=offset;
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public static int getInt( byte[] data, int offset )
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{
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int i = offset;
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int b0 = data[i++] & 0xFF;
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int b1 = data[i++] & 0xFF;
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int b2 = data[i++] & 0xFF;
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int b3 = data[i++] & 0xFF;
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return (b3 << 24) + (b2 << 16) + (b1 << 8) + (b0 << 0);
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return ( b3 << 24 ) + ( b2 << 16 ) + ( b1 << 8 ) + ( b0 << 0 );
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}
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/**
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* get an int value from the beginning of a byte array
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*
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*@param data the byte array
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*@return the int (32-bit) value
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* get a long value from a byte array
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*
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* @param data
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* the byte array
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* @param offset
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* a starting offset into the byte array
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* @return the long (64-bit) value
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*/
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public static int getInt(byte[] data) {
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return getInt(data, 0);
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public static long getLong( byte[] data, int offset )
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{
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long result = 0;
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for ( int j = offset + LONG_SIZE - 1; j >= offset; j-- )
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{
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result <<= 8;
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result |= 0xff & data[j];
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}
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return result;
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}
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/**
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* get a short value from the beginning of a byte array
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*
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* @param data
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* the byte array
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* @return the short (16-bit) value
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*/
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public static short getShort( byte[] data )
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{
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return getShort( data, 0 );
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}
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/**
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* get an unsigned int value from a byte array
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*
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*@param data the byte array
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*@param offset a starting offset into the byte array
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*@return the unsigned int (32-bit) value in a long
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* get a short value from a byte array
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*
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* @param data
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* the byte array
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* @param offset
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* a starting offset into the byte array
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* @return the short (16-bit) value
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*/
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public static long getUInt(byte[] data, int offset) {
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long retNum = getInt(data, offset);
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public static short getShort( byte[] data, int offset )
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{
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int b0 = data[offset] & 0xFF;
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int b1 = data[offset + 1] & 0xFF;
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return (short) ( ( b1 << 8 ) + ( b0 << 0 ) );
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}
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/**
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* Read short array
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*
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* @param data
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* the original byte array
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* @param offset
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* Where to start copying from.
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* @param size
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* Number of bytes to copy.
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* @throws IndexOutOfBoundsException
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* - if read would cause access of data outside array bounds.
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*/
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public static short[] getShortArray( byte[] data, int offset, int size )
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{
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short[] result = new short[size / SHORT_SIZE];
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for ( int i = 0; i < result.length; i++ )
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{
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result[i] = getShort( data, offset + i * SHORT_SIZE );
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}
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return result;
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}
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/**
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* get the unsigned value of a byte.
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*
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* @param data
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* the byte array.
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* @param offset
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* a starting offset into the byte array.
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* @return the unsigned value of the byte as a 16 bit short
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*/
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public static short getUByte( byte[] data, int offset )
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{
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return (short) ( data[offset] & 0xFF );
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}
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/**
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* get an unsigned int value from a byte array
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*
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* @param data
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* the byte array
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* @return the unsigned int (32-bit) value in a long
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*/
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public static long getUInt( byte[] data )
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{
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return getUInt( data, 0 );
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}
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/**
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* get an unsigned int value from a byte array
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*
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* @param data
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* the byte array
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* @param offset
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* a starting offset into the byte array
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* @return the unsigned int (32-bit) value in a long
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*/
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public static long getUInt( byte[] data, int offset )
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{
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long retNum = getInt( data, offset );
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return retNum & 0x00FFFFFFFFl;
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}
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/**
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* get an unsigned int value from a byte array
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*
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*@param data the byte array
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*@return the unsigned int (32-bit) value in a long
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* get the unsigned value of a byte.
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*
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* @param data
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* the byte array.
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* @param offset
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* a starting offset into the byte array.
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* @return the unsigned value of the byte as a 32 bit integer
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* @deprecated Use {@link #getUByte(byte[], int)} instead
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*/
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public static long getUInt(byte[] data) {
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return getUInt(data,0);
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@Deprecated
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public static int getUnsignedByte( byte[] data, int offset )
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{
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return data[offset] & 0xFF;
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}
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/**
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* get a long value from a byte array
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*
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*@param data the byte array
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*@param offset a starting offset into the byte array
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*@return the long (64-bit) value
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* get an unsigned short value from the beginning of a byte array
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*
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* @param data
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* the byte array
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* @return the unsigned short (16-bit) value in an int
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*/
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public static long getLong(byte[] data, int offset) {
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long result = 0;
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for (int j = offset + LONG_SIZE - 1; j >= offset; j--) {
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result <<= 8;
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result |= 0xff & data[j];
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}
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return result;
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public static int getUShort( byte[] data )
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{
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return getUShort( data, 0 );
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}
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/**
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* get a double value from a byte array, reads it in little endian format
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* then converts the resulting revolting IEEE 754 (curse them) floating
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* point number to a happy java double
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*
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*@param data the byte array
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*@param offset a starting offset into the byte array
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*@return the double (64-bit) value
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* get an unsigned short value from a byte array
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*
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* @param data
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* the byte array
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* @param offset
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* a starting offset into the byte array
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* @return the unsigned short (16-bit) value in an integer
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*/
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public static double getDouble(byte[] data, int offset) {
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return Double.longBitsToDouble(getLong(data, offset));
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public static int getUShort( byte[] data, int offset )
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{
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int b0 = data[offset] & 0xFF;
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int b1 = data[offset + 1] & 0xFF;
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return ( b1 << 8 ) + ( b0 << 0 );
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}
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/**
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* put a short value into a byte array
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*
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*@param data the byte array
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*@param offset a starting offset into the byte array
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*@param value the short (16-bit) value
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*/
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public static void putShort(byte[] data, int offset, short value) {
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int i = offset;
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data[i++] = (byte)((value >>> 0) & 0xFF);
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data[i++] = (byte)((value >>> 8) & 0xFF);
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}
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/**
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* executes:<p/>
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* executes:
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* <p/>
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* <code>
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* data[offset] = (byte)value;
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* </code></p>
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* </code>
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* </p>
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* Added for consistency with other put~() methods
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*/
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public static void putByte(byte[] data, int offset, int value) {
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public static void putByte( byte[] data, int offset, int value )
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{
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data[offset] = (byte) value;
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}
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/**
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* put an unsigned byte value into a byte array
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* put a double value into a byte array
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*
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* @param data
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* the byte array
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* @param offset
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* a starting offset into the byte array
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* @param value
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* the short (16-bit) value
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*
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* @exception ArrayIndexOutOfBoundsException
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* may be thrown
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* the double (64-bit) value
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*/
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public static void putUByte( byte[] data, int offset, short value )
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public static void putDouble( byte[] data, int offset, double value )
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{
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data[offset] = (byte) ( value & 0xFF );
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putLong( data, offset, Double.doubleToLongBits( value ) );
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}
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/**
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* put an unsigned short value into a byte array
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*
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* @param data the byte array
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* @param offset a starting offset into the byte array
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* @param value the short (16-bit) value
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*
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* @exception ArrayIndexOutOfBoundsException may be thrown
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* put an int value into beginning of a byte array
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*
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* @param data
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* the byte array
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* @param value
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* the int (32-bit) value
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*/
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public static void putUShort(byte[] data, int offset, int value) {
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public static void putInt( byte[] data, int value )
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{
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putInt( data, 0, value );
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}
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/**
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* put an int value into a byte array
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*
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* @param data
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* the byte array
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* @param offset
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* a starting offset into the byte array
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* @param value
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* the int (32-bit) value
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*/
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public static void putInt( byte[] data, int offset, int value )
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{
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int i = offset;
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data[i++] = (byte)((value >>> 0) & 0xFF);
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data[i++] = (byte)((value >>> 8) & 0xFF);
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}
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/**
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* put a short value into beginning of a byte array
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*
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*@param data the byte array
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*@param value the short (16-bit) value
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*/
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public static void putShort(byte[] data, short value) {
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putShort(data, 0, value);
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}
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|
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/**
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* put an int value into a byte array
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*
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*@param data the byte array
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*@param offset a starting offset into the byte array
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*@param value the int (32-bit) value
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*/
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public static void putInt(byte[] data, int offset, int value) {
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int i = offset;
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data[i++] = (byte)((value >>> 0) & 0xFF);
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data[i++] = (byte)((value >>> 8) & 0xFF);
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data[i++] = (byte)((value >>> 16) & 0xFF);
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data[i++] = (byte)((value >>> 24) & 0xFF);
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}
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/**
|
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* put an int value into beginning of a byte array
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*
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*@param data the byte array
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||||
*@param value the int (32-bit) value
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*/
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public static void putInt(byte[] data, int value) {
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putInt(data, 0, value);
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data[i++] = (byte) ( ( value >>> 0 ) & 0xFF );
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data[i++] = (byte) ( ( value >>> 8 ) & 0xFF );
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data[i++] = (byte) ( ( value >>> 16 ) & 0xFF );
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data[i++] = (byte) ( ( value >>> 24 ) & 0xFF );
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}
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|
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/**
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|
|
@ -274,30 +351,144 @@ public class LittleEndian implements LittleEndianConsts {
|
|||
}
|
||||
|
||||
/**
|
||||
* 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
|
||||
* 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 putUInt(byte[] data, int offset, long value) {
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int i = offset;
|
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data[i++] = (byte)((value >>> 0) & 0xFF);
|
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data[i++] = (byte)((value >>> 8) & 0xFF);
|
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data[i++] = (byte)((value >>> 16) & 0xFF);
|
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data[i++] = (byte)((value >>> 24) & 0xFF);
|
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public static void putLong( byte[] data, int offset, long value )
|
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{
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int limit = LONG_SIZE + offset;
|
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long v = value;
|
||||
|
||||
for ( int j = offset; j < limit; j++ )
|
||||
{
|
||||
data[j] = (byte) ( v & 0xFF );
|
||||
v >>= 8;
|
||||
}
|
||||
}
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/**
|
||||
* 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 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 putUInt(byte[] data, long value) {
|
||||
putUInt(data, 0, 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 );
|
||||
}
|
||||
|
||||
/**
|
||||
* 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 putShort( byte[] data, short value )
|
||||
{
|
||||
putShort( data, 0, value );
|
||||
}
|
||||
|
||||
/**
|
||||
* Put signed short into output stream
|
||||
*
|
||||
* @param value
|
||||
* the short (16-bit) value
|
||||
* @param outputStream
|
||||
* output stream
|
||||
* @throws IOException
|
||||
* if an I/O error occurs
|
||||
*/
|
||||
public static void putShort( OutputStream outputStream, short value )
|
||||
throws IOException
|
||||
{
|
||||
outputStream.write( (byte) ( ( value >>> 0 ) & 0xFF ) );
|
||||
outputStream.write( (byte) ( ( value >>> 8 ) & 0xFF ) );
|
||||
}
|
||||
|
||||
/**
|
||||
* 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 putShortArray( byte[] data, int offset, short[] value )
|
||||
{
|
||||
for ( short s : value )
|
||||
{
|
||||
putShort( data, offset, s );
|
||||
offset += SHORT_SIZE;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* 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 putUByte( byte[] data, int offset, short value )
|
||||
{
|
||||
data[offset] = (byte) ( value & 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 )
|
||||
{
|
||||
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 beginning of a byte array
|
||||
*
|
||||
* @param data
|
||||
* the byte array
|
||||
* @param value
|
||||
* the int (32-bit) value
|
||||
*/
|
||||
public static void putUInt( byte[] data, long value )
|
||||
{
|
||||
putUInt( data, 0, value );
|
||||
}
|
||||
|
||||
/**
|
||||
|
|
@ -320,103 +511,64 @@ public class LittleEndian implements LittleEndianConsts {
|
|||
}
|
||||
|
||||
/**
|
||||
* 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
|
||||
* 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 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 putUShort( byte[] data, int offset, int value )
|
||||
{
|
||||
int i = offset;
|
||||
data[i++] = (byte) ( ( value >>> 0 ) & 0xFF );
|
||||
data[i++] = (byte) ( ( value >>> 8 ) & 0xFF );
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* 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
|
||||
* 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 void putDouble(byte[] data, int offset, double value) {
|
||||
putLong(data, offset, Double.doubleToLongBits(value));
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Exception to handle buffer underruns
|
||||
*
|
||||
*@author Marc Johnson (mjohnson at apache dot org)
|
||||
*/
|
||||
public static final class BufferUnderrunException extends IOException {
|
||||
|
||||
BufferUnderrunException() {
|
||||
super("buffer underrun");
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* 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
|
||||
*/
|
||||
public static short readShort(InputStream stream) throws IOException, BufferUnderrunException {
|
||||
|
||||
return (short) readUShort(stream);
|
||||
}
|
||||
|
||||
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);
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* 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 {
|
||||
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
|
||||
* 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 {
|
||||
public static long readLong( InputStream stream ) throws IOException,
|
||||
BufferUnderrunException
|
||||
{
|
||||
int ch1 = stream.read();
|
||||
int ch2 = stream.read();
|
||||
int ch3 = stream.read();
|
||||
|
|
@ -425,112 +577,62 @@ public class LittleEndian implements LittleEndianConsts {
|
|||
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
|
||||
* 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
|
||||
*/
|
||||
public static int ubyteToInt(byte b) {
|
||||
public static short readShort( InputStream stream ) throws IOException,
|
||||
BufferUnderrunException
|
||||
{
|
||||
return (short) readUShort( stream );
|
||||
}
|
||||
|
||||
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 );
|
||||
}
|
||||
|
||||
/**
|
||||
* 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.
|
||||
*
|
||||
* @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 )
|
||||
private LittleEndian()
|
||||
{
|
||||
return (short) ( data[offset] & 0xFF );
|
||||
}
|
||||
|
||||
/**
|
||||
* 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 )
|
||||
{
|
||||
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;
|
||||
}
|
||||
|
||||
/**
|
||||
* 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 putShortArray( byte[] data, int offset, short[] value )
|
||||
{
|
||||
for ( short s : value )
|
||||
{
|
||||
putShort( data, offset, s );
|
||||
offset += SHORT_SIZE;
|
||||
}
|
||||
// no instances of this class
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue