Added UInt
PR: Obtained from: Submitted by: Reviewed by: git-svn-id: https://svn.apache.org/repos/asf/jakarta/poi/trunk@352614 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Andrew C. Oliver
parent
7ae47e6d37
commit
49562f6301
@ -1,57 +1,57 @@
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/* ====================================================================
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* The Apache Software License, Version 1.1
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/*
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* ====================================================================
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* The Apache Software License, Version 1.1
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*
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* Copyright (c) 2002 The Apache Software Foundation. All rights
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* reserved.
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* Copyright (c) 2002 The Apache Software Foundation. All rights
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* reserved.
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*
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* Redistribution and use in source and binary forms, with or without
|
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* modification, are permitted provided that the following conditions
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* are met:
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* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
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*
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
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||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
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||||
*
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* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in
|
||||
* the documentation and/or other materials provided with the
|
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* distribution.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in
|
||||
* the documentation and/or other materials provided with the
|
||||
* distribution.
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*
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* 3. The end-user documentation included with the redistribution,
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* if any, must include the following acknowledgment:
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||||
* "This product includes software developed by the
|
||||
* Apache Software Foundation (http://www.apache.org/)."
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||||
* Alternately, this acknowledgment may appear in the software itself,
|
||||
* if and wherever such third-party acknowledgments normally appear.
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* 3. The end-user documentation included with the redistribution,
|
||||
* if any, must include the following acknowledgment:
|
||||
* "This product includes software developed by the
|
||||
* Apache Software Foundation (http://www.apache.org/)."
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||||
* Alternately, this acknowledgment may appear in the software itself,
|
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* if and wherever such third-party acknowledgments normally appear.
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*
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* 4. The names "Apache" and "Apache Software Foundation" and
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* "Apache POI" must not be used to endorse or promote products
|
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* derived from this software without prior written permission. For
|
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* written permission, please contact apache@apache.org.
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* 4. The names "Apache" and "Apache Software Foundation" and
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* "Apache POI" must not be used to endorse or promote products
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* derived from this software without prior written permission. For
|
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* written permission, please contact apache@apache.org.
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*
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* 5. Products derived from this software may not be called "Apache",
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* "Apache POI", nor may "Apache" appear in their name, without
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* prior written permission of the Apache Software Foundation.
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* 5. Products derived from this software may not be called "Apache",
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* "Apache POI", nor may "Apache" appear in their name, without
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* prior written permission of the Apache Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
|
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
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* SUCH DAMAGE.
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* ====================================================================
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
|
||||
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
||||
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
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* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
|
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
||||
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
||||
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
|
||||
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
|
||||
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
||||
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
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* SUCH DAMAGE.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*/
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package org.apache.poi.util;
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import java.io.IOException;
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@ -59,568 +59,558 @@ import java.io.InputStream;
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import java.util.Arrays;
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/**
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* a utility class for handling little-endian numbers, which the 80x86
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* world is replete with. The methods are all static, and input/output
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* is from/to byte 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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*@created May 10, 2002
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*/
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public class LittleEndian
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implements LittleEndianConsts
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{
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implements LittleEndianConsts {
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// all methods are static, so an accessible constructor makes no
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// sense
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private LittleEndian()
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{
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}
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/**
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* Constructor for the LittleEndian object
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*/
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private LittleEndian() { }
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/**
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* get a short value from a byte array
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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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*
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* @return the short (16-bit) value
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*
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* @exception ArrayIndexOutOfBoundsException may be thrown
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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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*/
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public static short getShort(final byte[] data, final int offset)
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{
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return (short)getNumber(data, offset, SHORT_SIZE);
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public static short getShort(final byte[] data, final int offset) {
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return (short) getNumber(data, offset, SHORT_SIZE);
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}
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/**
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* get an unsigned short value from a byte array
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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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*
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* @return the unsigned short (16-bit) value in an integer
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*
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* @exception ArrayIndexOutOfBoundsException may be thrown
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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(final byte[] data, final int offset)
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{
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short num = (short)getNumber(data, offset, SHORT_SIZE);
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public static int getUShort(final byte[] data, final int offset) {
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short num = (short) getNumber(data, offset, SHORT_SIZE);
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int retNum;
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if (num < 0)
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retNum = ((int)Short.MAX_VALUE+1)*2+(int)num;
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else
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retNum = (int)num;
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if (num < 0) {
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retNum = ((int) Short.MAX_VALUE + 1) * 2 + (int) num;
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} else {
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retNum = (int) num;
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}
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return retNum;
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}
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/**
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* get a short array from a byte array.
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* get a short array from a byte array.
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*
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*@param data Description of the Parameter
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*@param offset Description of the Parameter
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*@param size Description of the Parameter
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*@return The simpleShortArray value
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*/
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public static short[] getSimpleShortArray(final byte[] data, final int offset, final int size)
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{
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public static short[] getSimpleShortArray(final byte[] data, final int offset, final int size) {
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short[] results = new short[size];
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for (int i = 0; i < size; i++)
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{
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for (int i = 0; i < size; i++) {
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results[i] = getShort(data, offset + 2 + (i * 2));
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}
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return results;
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}
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/**
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* get a short array from a byte array. The short array is assumed
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* to start with a word describing the length of the array.
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* get a short array from a byte array. The short array is assumed to start
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* with a word describing the length of the array.
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*
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*@param data Description of the Parameter
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*@param offset Description of the Parameter
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*@return The shortArray value
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*/
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public static short[] getShortArray(final byte[] data, final int offset)
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{
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public static short[] getShortArray(final byte[] data, final int offset) {
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int size = (short) getNumber(data, offset, SHORT_SIZE);
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short[] results = getSimpleShortArray(data, offset, size);
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return results;
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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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* 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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*
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* @return the short (16-bit) value
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*
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* @exception ArrayIndexOutOfBoundsException may be thrown
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*@param data 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(final byte[] data)
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{
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public static short getShort(final byte[] data) {
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return getShort(data, 0);
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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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* 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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*
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* @return the unsigned short (16-bit) value in an int
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*
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* @exception ArrayIndexOutOfBoundsException may be thrown
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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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*/
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public static int getUShort(final byte[] data)
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{
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public static int getUShort(final byte[] data) {
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return getUShort(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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* 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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*
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* @return the int (32-bit) value
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*
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* @exception ArrayIndexOutOfBoundsException may be thrown
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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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*/
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public static int getInt(final byte[] data, final int offset)
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{
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public static int getInt(final byte[] data, final int offset) {
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return (int) getNumber(data, offset, INT_SIZE);
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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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* 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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*
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* @return the int (32-bit) value
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*
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* @exception ArrayIndexOutOfBoundsException may be thrown
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*@param data 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(final byte[] data)
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{
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public static int getInt(final byte[] data) {
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return getInt(data, 0);
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}
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/**
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* get a long value from a byte array
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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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*@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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*/
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public static long getUInt(final byte[] data, final int offset) {
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int num = (int) getNumber(data, offset, INT_SIZE);
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long retNum;
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if (num < 0) {
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retNum = ((long) Integer.MAX_VALUE + 1) * 2 + (long) num;
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} else {
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retNum = (int) num;
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}
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return retNum;
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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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* @return the long (64-bit) value
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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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*/
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public static long getUInt(final byte[] data) {
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return getUInt(data,0);
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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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* @exception ArrayIndexOutOfBoundsException may be thrown
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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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*/
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public static long getLong(final byte[] data, final int offset)
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{
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public static long getLong(final byte[] data, final int offset) {
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return getNumber(data, offset, LONG_SIZE);
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}
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/**
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* get a long value from the beginning of a byte array
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* get a long 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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*
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* @return the long (64-bit) value
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*
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* @exception ArrayIndexOutOfBoundsException may be thrown
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*@param data the byte array
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*@return the long (64-bit) value
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*/
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public static long getLong(final byte[] data)
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{
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public static long getLong(final byte[] data) {
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return getLong(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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* 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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*
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* @return the double (64-bit) value
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*
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* @exception ArrayIndexOutOfBoundsException may be thrown
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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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*/
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public static double getDouble(final byte[] data, final int offset)
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{
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public static double getDouble(final byte[] data, final int offset) {
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return Double.longBitsToDouble(getNumber(data, offset, DOUBLE_SIZE));
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}
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/**
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* get a double value from the beginning of a byte array
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* get a double 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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*
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* @return the double (64-bit) value
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*
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* @exception ArrayIndexOutOfBoundsException may be thrown
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*@param data the byte array
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*@return the double (64-bit) value
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*/
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public static double getDouble(final byte[] data)
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{
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public static double getDouble(final byte[] data) {
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return getDouble(data, 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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* 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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* @exception ArrayIndexOutOfBoundsException may be thrown
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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(final byte[] data, final int offset,
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final short value)
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{
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final short value) {
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putNumber(data, offset, value, SHORT_SIZE);
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}
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/**
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* put a array of shorts into a byte array
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* put a array of shorts 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 array
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*
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* @exception ArrayIndexOutOfBoundsException may be thrown
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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 array
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*/
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public static void putShortArray(final byte[] data, final int offset, final short[] value)
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{
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public static void putShortArray(final byte[] data, final int offset, final short[] value) {
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putNumber(data, offset, value.length, SHORT_SIZE);
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for (int i = 0; i < value.length; i++)
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{
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for (int i = 0; i < value.length; i++) {
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putNumber(data, offset + 2 + (i * 2), value[i], SHORT_SIZE);
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}
|
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}
|
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|
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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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* 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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* @exception ArrayIndexOutOfBoundsException may be thrown
|
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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(final byte[] data, final short value)
|
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{
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public static void putShort(final byte[] data, final short value) {
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putShort(data, 0, value);
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}
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||||
|
||||
/**
|
||||
* put an int value into a byte array
|
||||
* 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
|
||||
*
|
||||
* @exception ArrayIndexOutOfBoundsException may be thrown
|
||||
*@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(final byte[] data, final int offset,
|
||||
final int value)
|
||||
{
|
||||
final int value) {
|
||||
putNumber(data, offset, value, INT_SIZE);
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* put an int value into beginning of a byte array
|
||||
* put an int value into beginning of a byte array
|
||||
*
|
||||
* @param data the byte array
|
||||
* @param value the int (32-bit) value
|
||||
*
|
||||
* @exception ArrayIndexOutOfBoundsException may be thrown
|
||||
*@param data the byte array
|
||||
*@param value the int (32-bit) value
|
||||
*/
|
||||
|
||||
public static void putInt(final byte[] data, final int value)
|
||||
{
|
||||
public static void putInt(final byte[] data, final int value) {
|
||||
putInt(data, 0, value);
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* put a long value into a byte array
|
||||
* 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
|
||||
*
|
||||
* @exception ArrayIndexOutOfBoundsException may be thrown
|
||||
*@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(final byte[] data, final int offset,
|
||||
final long value)
|
||||
{
|
||||
final long value) {
|
||||
putNumber(data, offset, value, LONG_SIZE);
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* put a long value into beginning of a byte array
|
||||
* put a long value into beginning of a byte array
|
||||
*
|
||||
* @param data the byte array
|
||||
* @param value the long (64-bit) value
|
||||
*
|
||||
* @exception ArrayIndexOutOfBoundsException may be thrown
|
||||
*@param data the byte array
|
||||
*@param value the long (64-bit) value
|
||||
*/
|
||||
|
||||
public static void putLong(final byte[] data, final long value)
|
||||
{
|
||||
public static void putLong(final byte[] data, final long value) {
|
||||
putLong(data, 0, value);
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* put a double value into a byte array
|
||||
* 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
|
||||
*
|
||||
* @exception ArrayIndexOutOfBoundsException may be thrown
|
||||
*@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(final byte[] data, final int offset,
|
||||
final double value)
|
||||
{
|
||||
final double value) {
|
||||
putNumber(data, offset, Double.doubleToLongBits(value), DOUBLE_SIZE);
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* put a double value into beginning of a byte array
|
||||
* put a double value into beginning of a byte array
|
||||
*
|
||||
* @param data the byte array
|
||||
* @param value the double (64-bit) value
|
||||
*
|
||||
* @exception ArrayIndexOutOfBoundsException may be thrown
|
||||
*@param data the byte array
|
||||
*@param value the double (64-bit) value
|
||||
*/
|
||||
|
||||
public static void putDouble(final byte[] data, final double value)
|
||||
{
|
||||
public static void putDouble(final byte[] data, final double value) {
|
||||
putDouble(data, 0, value);
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Exception to handle buffer underruns
|
||||
* Exception to handle buffer underruns
|
||||
*
|
||||
* @author Marc Johnson (mjohnson at apache dot org)
|
||||
*@author Marc Johnson (mjohnson at apache dot org)
|
||||
*@created May 10, 2002
|
||||
*/
|
||||
|
||||
public static class BufferUnderrunException
|
||||
extends IOException
|
||||
{
|
||||
extends IOException {
|
||||
|
||||
/**
|
||||
* simple constructor
|
||||
* simple constructor
|
||||
*/
|
||||
|
||||
BufferUnderrunException()
|
||||
{
|
||||
BufferUnderrunException() {
|
||||
super("buffer underrun");
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* get a short value from an InputStream
|
||||
* 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
|
||||
*@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(final InputStream stream)
|
||||
throws IOException, BufferUnderrunException
|
||||
{
|
||||
throws IOException, BufferUnderrunException {
|
||||
return getShort(readFromStream(stream, SHORT_SIZE));
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* get an int value from an InputStream
|
||||
* 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
|
||||
*@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(final InputStream stream)
|
||||
throws IOException, BufferUnderrunException
|
||||
{
|
||||
throws IOException, BufferUnderrunException {
|
||||
return getInt(readFromStream(stream, INT_SIZE));
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* get a long value from an InputStream
|
||||
* 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
|
||||
*@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(final InputStream stream)
|
||||
throws IOException, BufferUnderrunException
|
||||
{
|
||||
throws IOException, BufferUnderrunException {
|
||||
return getLong(readFromStream(stream, LONG_SIZE));
|
||||
}
|
||||
|
||||
private static final byte[] _short_buffer = new byte[SHORT_SIZE];
|
||||
private static final byte[] _int_buffer = new byte[INT_SIZE];
|
||||
private static final byte[] _long_buffer = new byte[LONG_SIZE];
|
||||
|
||||
private final static byte[] _short_buffer = new byte[SHORT_SIZE];
|
||||
private final static byte[] _int_buffer = new byte[INT_SIZE];
|
||||
private final static byte[] _long_buffer = new byte[LONG_SIZE];
|
||||
|
||||
|
||||
/**
|
||||
* Read the appropriate number of bytes from the stream and return
|
||||
* them to the caller.
|
||||
* <p>
|
||||
* It should be noted that, in an attempt to improve system
|
||||
* performance and to prevent a transient explosion of discarded
|
||||
* byte arrays to be garbage collected, static byte arrays are
|
||||
* employed for the standard cases of reading a short, an int, or
|
||||
* a long.
|
||||
* <p>
|
||||
* <b>THIS INTRODUCES A RISK FOR THREADED OPERATIONS!</b>
|
||||
* <p>
|
||||
* However, for the purposes of the POI project, this risk is
|
||||
* deemed negligible. It is, however, so noted.
|
||||
* Read the appropriate number of bytes from the stream and return them to
|
||||
* the caller. <p>
|
||||
*
|
||||
* @param stream the InputStream we're reading from
|
||||
* @param size the number of bytes to read; in 99.99% of cases,
|
||||
* this will be SHORT_SIZE, INT_SIZE, or LONG_SIZE --
|
||||
* but it doesn't have to be.
|
||||
* It should be noted that, in an attempt to improve system performance and
|
||||
* to prevent a transient explosion of discarded byte arrays to be garbage
|
||||
* collected, static byte arrays are employed for the standard cases of
|
||||
* reading a short, an int, or a long. <p>
|
||||
*
|
||||
* @return the byte array containing the required number of
|
||||
* bytes. The array will contain all zero's on end of
|
||||
* stream
|
||||
* <b>THIS INTRODUCES A RISK FOR THREADED OPERATIONS!</b> <p>
|
||||
*
|
||||
* @exception IOException will be propagated back to the caller
|
||||
* @exception BufferUnderrunException if the stream cannot provide
|
||||
* enough bytes
|
||||
* However, for the purposes of the POI project, this risk is deemed
|
||||
* negligible. It is, however, so noted.
|
||||
*
|
||||
*@param stream the InputStream we're reading from
|
||||
*@param size the number of bytes to read; in
|
||||
* 99.99% of cases, this will be SHORT_SIZE, INT_SIZE, or LONG_SIZE --
|
||||
* but it doesn't have to be.
|
||||
*@return the byte array containing the
|
||||
* required number of bytes. The array will contain all zero's on end
|
||||
* of stream
|
||||
*@exception IOException will be propagated back to the caller
|
||||
*@exception BufferUnderrunException if the stream cannot provide enough
|
||||
* bytes
|
||||
*/
|
||||
|
||||
public static byte[] readFromStream(final InputStream stream,
|
||||
final int size)
|
||||
throws IOException, BufferUnderrunException
|
||||
{
|
||||
final int size)
|
||||
throws IOException, BufferUnderrunException {
|
||||
byte[] buffer = null;
|
||||
|
||||
switch (size)
|
||||
{
|
||||
switch (size) {
|
||||
|
||||
case SHORT_SIZE:
|
||||
buffer = _short_buffer;
|
||||
break;
|
||||
|
||||
case INT_SIZE:
|
||||
buffer = _int_buffer;
|
||||
break;
|
||||
|
||||
case LONG_SIZE:
|
||||
buffer = _long_buffer;
|
||||
break;
|
||||
|
||||
default :
|
||||
default:
|
||||
buffer = new byte[size];
|
||||
break;
|
||||
}
|
||||
int count = stream.read(buffer);
|
||||
|
||||
if (count == -1)
|
||||
{
|
||||
if (count == -1) {
|
||||
|
||||
// return a zero-filled buffer
|
||||
Arrays.fill(buffer, (byte) 0);
|
||||
} else if (count != size)
|
||||
{
|
||||
} else if (count != size) {
|
||||
throw new BufferUnderrunException();
|
||||
}
|
||||
return buffer;
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Gets the number attribute of the LittleEndian class
|
||||
*
|
||||
*@param data Description of the Parameter
|
||||
*@param offset Description of the Parameter
|
||||
*@param size Description of the Parameter
|
||||
*@return The number value
|
||||
*/
|
||||
private static long getNumber(final byte[] data, final int offset,
|
||||
final int size)
|
||||
{
|
||||
final int size) {
|
||||
long result = 0;
|
||||
|
||||
for (int j = offset + size - 1; j >= offset; j--)
|
||||
{
|
||||
for (int j = offset + size - 1; j >= offset; j--) {
|
||||
result <<= 8;
|
||||
result |= 0xff & data[j];
|
||||
}
|
||||
return result;
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Description of the Method
|
||||
*
|
||||
*@param data Description of the Parameter
|
||||
*@param offset Description of the Parameter
|
||||
*@param value Description of the Parameter
|
||||
*@param size Description of the Parameter
|
||||
*/
|
||||
private static void putNumber(final byte[] data, final int offset,
|
||||
final long value, final int size)
|
||||
{
|
||||
final long value, final int size) {
|
||||
int limit = size + offset;
|
||||
long v = value;
|
||||
|
||||
for (int j = offset; j < limit; j++)
|
||||
{
|
||||
for (int j = offset; j < limit; j++) {
|
||||
data[j] = (byte) (v & 0xFF);
|
||||
v >>= 8;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Convert an 'unsigned' byte to an integer. ie, don't carry across the sign.
|
||||
* 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)
|
||||
{
|
||||
public static int ubyteToInt(byte b) {
|
||||
return ((b & 0x80) == 0 ? (int) b : (int) (b & (byte) 0x7f) + 0x80);
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* get the unsigned value of a byte.
|
||||
* 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
|
||||
*
|
||||
* @exception ArrayIndexOutOfBoundsException may be thrown
|
||||
*@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
|
||||
*/
|
||||
public static int getUnsignedByte(final byte[] data, final int offset)
|
||||
{
|
||||
public static int getUnsignedByte(final byte[] data, final int offset) {
|
||||
return (int) getNumber(data, offset, BYTE_SIZE);
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* get the unsigned value of a byte.
|
||||
* get the unsigned value of a byte.
|
||||
*
|
||||
* @param data the byte array
|
||||
*
|
||||
* @return the unsigned value of the byte as a 32 bit integer
|
||||
*
|
||||
* @exception ArrayIndexOutOfBoundsException may be thrown
|
||||
*@param data the byte array
|
||||
*@return the unsigned value of the byte as a 32 bit integer
|
||||
*/
|
||||
public static int getUnsignedByte(final byte[] data)
|
||||
{
|
||||
public static int getUnsignedByte(final byte[] data) {
|
||||
return getUnsignedByte(data, 0);
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Copy a portion of a byte array
|
||||
* 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.
|
||||
*
|
||||
* @throws IndexOutOfBoundsException - if copying would cause access of data
|
||||
* outside array bounds.
|
||||
*@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(final byte[] data, int offset, int size)
|
||||
{
|
||||
public static byte[] getByteArray(final byte[] data, int offset, int size) {
|
||||
byte[] copy = new byte[size];
|
||||
System.arraycopy(data, offset, copy, 0, size);
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user