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- /* ====================================================================
- Licensed to the Apache Software Foundation (ASF) under one or more
- contributor license agreements. See the NOTICE file distributed with
- this work for additional information regarding copyright ownership.
- The ASF licenses this file to You under the Apache License, Version 2.0
- (the "License"); you may not use this file except in compliance with
- the License. You may obtain a copy of the License at
-
- http://www.apache.org/licenses/LICENSE-2.0
-
- Unless required by applicable law or agreed to in writing, software
- distributed under the License is distributed on an "AS IS" BASIS,
- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- See the License for the specific language governing permissions and
- limitations under the License.
- ==================================================================== */
-
- package org.apache.poi.util;
-
- import java.io.IOException;
- import java.io.InputStream;
- import java.io.OutputStream;
- import java.io.Serializable;
-
- /**
- * 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.
- */
- @Internal
- public final class LittleEndian implements LittleEndianConsts {
-
- /**
- * Exception to handle buffer underruns
- */
- public static final class BufferUnderrunException extends IOException {
- /**
- * Serial version UID
- *
- * @see Serializable
- */
- private static final long serialVersionUID = 8736973884877006145L;
-
- BufferUnderrunException() {
- super( "buffer underrun" );
- }
- }
-
- /**
- * 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
- * @return the double (64-bit) value
- */
- public static double getDouble( byte[] data ) {
- return Double.longBitsToDouble( getLong( 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
- */
- public static double getDouble( byte[] data, int offset ) {
- return Double.longBitsToDouble( getLong( data, offset ) );
- }
-
- /**
- * get a float 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 float
- *
- * @param data
- * the byte array
- * @return the double (64-bit) value
- */
- public static float getFloat( byte[] data ) {
- return getFloat( data, 0 );
- }
-
- /**
- * get a float 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 float
- *
- * @param data
- * the byte array
- * @param offset
- * a starting offset into the byte array
- * @return the double (64-bit) value
- */
- public static float getFloat( byte[] data, int offset ) {
- return Float.intBitsToFloat( getInt( data, offset ) );
- }
-
- /**
- * 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 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
- */
- 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);
- }
-
- /**
- * get a long value from a byte array
- *
- * @param data
- * the byte array
- * @return the long (64-bit) value
- */
- public static long getLong( byte[] data ) {
- return getLong( data, 0 );
- }
-
- /**
- * 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 long getLong( byte[] data, int offset ) {
- long result = 0xff & data[offset + 7];
-
- 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 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 short getShort( byte[] data, int offset ) {
- int b0 = data[offset] & 0xFF;
- int b1 = data[offset + 1] & 0xFF;
- return (short) ( ( b1 << 8 ) + (b0) );
- }
-
- /**
- * 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;
- }
-
- /**
- * get the unsigned value of a byte.
- *
- * @param data
- * the byte array.
- * @return the unsigned value of the byte as a 16 bit short
- */
- public static short getUByte( byte[] data ) {
- return (short) ( data[0] & 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 ) {
- return (short) ( data[offset] & 0xFF );
- }
-
- /**
- * 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 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 long getUInt( byte[] data, int offset ) {
- long retNum = getInt( data, offset );
- return retNum & 0x00FFFFFFFFL;
- }
-
- /**
- * 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 int getUShort( byte[] data ) {
- return getUShort( data, 0 );
- }
-
- /**
- * 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
- */
- public static int getUShort( byte[] data, int offset ) {
- int b0 = data[offset] & 0xFF;
- int b1 = data[offset + 1] & 0xFF;
- return ( b1 << 8 ) + (b0);
- }
-
- /**
- * 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 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 putDouble( byte[] data, int offset, double value ) {
- putLong( data, offset, Double.doubleToLongBits( value ) );
- }
-
- /**
- * put a double value into a byte array
- *
- * @param value
- * the double (64-bit) value
- * @param outputStream
- * output stream
- * @throws IOException
- * if an I/O error occurs
- */
- public static void putDouble( double value, OutputStream outputStream ) throws IOException {
- putLong( Double.doubleToLongBits( value ), outputStream );
- }
-
- /**
- * put a float value into a byte array
- *
- * @param data
- * the byte array
- * @param offset
- * a starting offset into the byte array
- * @param value
- * the float (32-bit) value
- */
- public static void putFloat( byte[] data, int offset, float value ) {
- putInt( data, offset, Float.floatToIntBits( value ) );
- }
-
- /**
- * put a float value into a byte array
- *
- * @param value
- * the float (32-bit) value
- * @param outputStream
- * output stream
- * @throws IOException
- * if an I/O error occurs
- */
- @SuppressWarnings("unused")
- public static void putFloat(float value, OutputStream outputStream ) throws IOException {
- putInt( Float.floatToIntBits( value ), outputStream );
- }
-
- /**
- * 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 offset, int value ) {
- int i = offset;
- data[i++] = (byte) ( ( value ) & 0xFF );
- data[i++] = (byte) ( ( value >>> 8 ) & 0xFF );
- data[i++] = (byte) ( ( value >>> 16 ) & 0xFF );
- data[i] = (byte) ( ( value >>> 24 ) & 0xFF );
- }
-
- /**
- * Put 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 putInt( int value, OutputStream outputStream ) throws IOException {
- outputStream.write( (byte) ( ( value ) & 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
- */
- public static void putLong( byte[] data, int offset, long value ) {
- data[offset ] = (byte) ( ( value ) & 0xFF );
- data[offset + 1] = (byte) ( ( value >>> 8 ) & 0xFF );
- data[offset + 2] = (byte) ( ( value >>> 16 ) & 0xFF );
- data[offset + 3] = (byte) ( ( value >>> 24 ) & 0xFF );
- data[offset + 4] = (byte) ( ( value >>> 32 ) & 0xFF );
- data[offset + 5] = (byte) ( ( value >>> 40 ) & 0xFF );
- data[offset + 6] = (byte) ( ( value >>> 48 ) & 0xFF );
- data[offset + 7] = (byte) ( ( value >>> 56 ) & 0xFF );
- }
-
- /**
- * Put long into output stream
- *
- * @param value
- * the long (64-bit) value
- * @param outputStream
- * output stream
- * @throws IOException
- * if an I/O error occurs
- */
- public static void putLong( long value, OutputStream outputStream ) throws IOException {
- outputStream.write( (byte) ( ( value ) & 0xFF ) );
- outputStream.write( (byte) ( ( value >>> 8 ) & 0xFF ) );
- outputStream.write( (byte) ( ( value >>> 16 ) & 0xFF ) );
- outputStream.write( (byte) ( ( value >>> 24 ) & 0xFF ) );
- outputStream.write( (byte) ( ( value >>> 32 ) & 0xFF ) );
- outputStream.write( (byte) ( ( value >>> 40 ) & 0xFF ) );
- outputStream.write( (byte) ( ( value >>> 48 ) & 0xFF ) );
- outputStream.write( (byte) ( ( value >>> 56 ) & 0xFF ) );
- }
-
- /**
- * 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 ) & 0xFF );
- data[i ] = (byte) ( ( value >>> 8 ) & 0xFF );
- }
-
- /**
- * 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 ) & 0xFF ) );
- outputStream.write( (byte) ( ( value >>> 8 ) & 0xFF ) );
- }
-
- /**
- * Stores short array in buffer
- *
- * @param data
- * the byte array
- * @param startOffset
- * a starting offset into the byte array
- * @param value
- * the short (16-bit) values
- */
- public static void putShortArray( byte[] data, int startOffset, short[] value ) {
- int offset = startOffset;
- 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
- *
- * @throws 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
- *
- * @throws ArrayIndexOutOfBoundsException
- * may be thrown
- */
- public static void putUInt( byte[] data, int offset, long value ) {
- int i = offset;
- data[i++] = (byte) ( ( value ) & 0xFF );
- data[i++] = (byte) ( ( value >>> 8 ) & 0xFF );
- data[i++] = (byte) ( ( value >>> 16 ) & 0xFF );
- data[i ] = (byte) ( ( value >>> 24 ) & 0xFF );
- }
-
- /**
- * 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 ) & 0xFF ) );
- outputStream.write( (byte) ( ( value >>> 8 ) & 0xFF ) );
- outputStream.write( (byte) ( ( value >>> 16 ) & 0xFF ) );
- outputStream.write( (byte) ( ( value >>> 24 ) & 0xFF ) );
- }
-
- /**
- * 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
- *
- * @throws ArrayIndexOutOfBoundsException
- * may be thrown
- */
- public static void putUShort( byte[] data, int offset, int value ) {
- int i = offset;
- data[i++] = (byte) ( ( value ) & 0xFF );
- data[i ] = (byte) ( ( value >>> 8 ) & 0xFF );
- }
-
- /**
- * Put unsigned short into output stream
- *
- * @param value
- * the unsigned short (16-bit) value
- * @param outputStream
- * output stream
- * @throws IOException
- * if an I/O error occurs
- */
- public static void putUShort( int value, OutputStream outputStream ) throws IOException {
- outputStream.write( (byte) ( ( value ) & 0xFF ) );
- outputStream.write( (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
- * @throws IOException
- * will be propagated back to the caller
- * @throws BufferUnderrunException
- * if the stream cannot provide enough bytes
- */
- public static int readInt( InputStream stream ) throws IOException {
- int ch1 = stream.read();
- int ch2 = stream.read();
- int ch3 = stream.read();
- int ch4 = stream.read();
- if ( ( ch1 | ch2 | ch3 | ch4 ) < 0 )
- {
- throw new BufferUnderrunException();
- }
- return ( ch4 << 24 ) + ( ch3 << 16 ) + ( ch2 << 8 ) + ( ch1 );
- }
-
- /**
- * get an unsigned int value from an InputStream
- *
- * @param stream
- * the InputStream from which the int is to be read
- * @return the unsigned int (32-bit) value
- * @throws IOException
- * will be propagated back to the caller
- * @throws BufferUnderrunException
- * if the stream cannot provide enough bytes
- */
- public static long readUInt( InputStream stream ) throws IOException {
- long retNum = readInt(stream);
- return retNum & 0x00FFFFFFFFL;
- }
-
- /**
- * 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
- * @throws IOException
- * will be propagated back to the caller
- * @throws BufferUnderrunException
- * if the stream cannot provide enough bytes
- */
- public static long readLong( InputStream stream ) throws IOException {
- int ch1 = stream.read();
- int ch2 = stream.read();
- int ch3 = stream.read();
- int ch4 = stream.read();
- int ch5 = stream.read();
- int ch6 = stream.read();
- int ch7 = stream.read();
- int ch8 = stream.read();
- 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 );
- }
-
- /**
- * 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
- * @throws IOException
- * will be propagated back to the caller
- * @throws BufferUnderrunException
- * if the stream cannot provide enough bytes
- */
- public static short readShort( InputStream stream ) throws IOException {
- return (short) readUShort( stream );
- }
-
- public static int readUShort( InputStream stream ) throws IOException {
- int ch1 = stream.read();
- int ch2 = stream.read();
- if ( ( ch1 | ch2 ) < 0 ) {
- throw new BufferUnderrunException();
- }
- return ( ch2 << 8 ) + ( ch1 );
- }
-
- /**
- * 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;
- }
-
- private LittleEndian() {
- // no instances of this class
- }
- }
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