org.jpedal.utils.NumberUtils Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of OpenViewerFX Show documentation
Show all versions of OpenViewerFX Show documentation
An Open Source JavaFX PDF Viewer
/*
* ===========================================
* Java Pdf Extraction Decoding Access Library
* ===========================================
*
* Project Info: http://www.idrsolutions.com
* Help section for developers at http://www.idrsolutions.com/support/
*
* (C) Copyright 1997-2016 IDRsolutions and Contributors.
*
* This file is part of JPedal/JPDF2HTML5
*
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* ---------------
* NumberUtils.java
* ---------------
*/
package org.jpedal.utils;
/**
* useful static number methods
*/
public class NumberUtils {
public static final int[] powers={1,10,100,1000,10000,100000,1000000,10000000,100000000,
1000000000};
/**
* turn stream of bytes into a number
*/
public static int parseInt(int i, final int j, final byte[] bytes) {
int finalValue=0;
int power=0;
boolean isNegative=false;
i--; //decrement pointer to speed up
for(int current=j-1;current>i;current--){
if(bytes[current]=='-'){
isNegative=true;
}else{
if(bytes[current]!='0') {
finalValue += ((bytes[current]-48)*powers[power]);
}
//System.out.println(finalValue+" "+powers[power]+" "+current+" "+(char)bytes[current]+" "+bytes[current]);
power++;
}
}
if(isNegative) {
return -finalValue;
} else {
return finalValue;
}
}
public static double convertStreamFromDouble(byte[] stream, int intStart, int decStart, int intNumbers, int decNumbers) {
double dec;
double num;
double d;
double thous=0f,units=0f,tens=0f,hundreds=0f,tenths=0f,hundredths=0f, thousands=0f, tenthousands=0f,hunthousands=0f,millis=0f;
//thousands
if(intNumbers>3){
thous = getThousands(stream, intStart);
intStart++;
}
//hundreds
if(intNumbers>2){
hundreds = getHundreds(stream, intStart);
intStart++;
}
//tens
if(intNumbers>1){
tens = getTens(stream, intStart);
intStart++;
}
//units
if(intNumbers>0){
units = getUnits(stream, intStart);
}
//tenths
if(decNumbers>1){
decStart++; //move beyond.
tenths = getTenths(stream, decStart);
}
//hundredths
if(decNumbers>2){
decStart++; //move beyond.
hundredths = getHundredths(stream, decStart);
}
//thousands
if(decNumbers>3){
decStart++; //move beyond.
thousands = getThousandths(stream, decStart);
}
//tenthousands
if(decNumbers>4){
decStart++; //move beyond.
tenthousands = getTenThousandths(stream, decStart);
}
//100thousands
if(decNumbers>5){
decStart++; //move beyond.
hunthousands = getHundredThousdandths(stream, decStart);
}
if(decNumbers>6){
decStart++; //move beyond.
millis = getMillionths(stream, decStart);
}
dec=tenths+hundredths+thousands+tenthousands+hunthousands+millis;
num=thous+hundreds+tens+units;
d=num+dec;
return d;
}
/**
* turn stream of bytes into a flaot number
*/
public static float parseFloat(final int start, final int end, final byte[] stream) {
final float d;
int ptr=end;
int intStart=start;
boolean isMinus=false;
//hand optimised float code
//find decimal point
for(int j=end-1;j>start-1;j--){
if(stream[j]==46){ //'.'=46
ptr=j;
break;
}
}
int intChars=ptr;
final int decStart=ptr;
//allow for minus
if(stream[start]==43){ //'+'=43
intChars--;
intStart++;
}else if(stream[start]==45){ //'-'=45
//intChars--;
intStart++;
isMinus=true;
}
//optimisations
final int intNumbers=intChars-intStart;
final int decNumbers=end-ptr;
if(intNumbers>4){// || decNumbers>4){ //non-optimised to cover others
isMinus=false;
final int count=end-start;
final byte[] floatVal=new byte[count];
System.arraycopy(stream, start,floatVal,0,count);
//System.out.println(new String(floatVal)+"<");
d=Float.parseFloat(new String(floatVal));
}else{
d = convertFloatFromStream(stream, intStart, decStart, intNumbers, decNumbers);
}
if(isMinus) {
return -d;
} else {
return d;
}
}
public static float convertFloatFromStream(byte[] stream, int intStart, int decStart, int intNumbers, int decNumbers) {
float dec;
float num;
float d;
float thous=0f,units=0f,tens=0f,hundreds=0f,tenths=0f,hundredths=0f, thousands=0f, tenthousands=0f,hunthousands=0f,millis=0f;
//thousands
if(intNumbers>3){
thous = getThousands(stream, intStart);
intStart++;
}
//hundreds
if(intNumbers>2){
hundreds = getHundreds(stream, intStart);
intStart++;
}
//tens
if(intNumbers>1){
tens = getTens(stream, intStart);
intStart++;
}
//units
if(intNumbers>0){
units = getUnits(stream, intStart);
}
//tenths
if(decNumbers>1){
decStart++; //move beyond.
tenths = getTenths(stream, decStart);
}
//hundredths
if(decNumbers>2){
decStart++; //move beyond.
hundredths = getHundredths(stream, decStart);
}
//thousands
if(decNumbers>3){
decStart++; //move beyond.
thousands = getThousandths(stream, decStart);
}
//tenthousands
if(decNumbers>4){
decStart++; //move beyond.
tenthousands = getTenThousandths(stream, decStart);
}
//100thousands
if(decNumbers>5){
decStart++; //move beyond.
hunthousands = getHundredThousdandths(stream, decStart);
}
if(decNumbers>6){
decStart++; //move beyond.
millis = getMillionths(stream, decStart);
}
dec=tenths+hundredths+thousands+tenthousands+hunthousands+millis;
num=thous+hundreds+tens+units;
d=num+dec;
return d;
}
private static float getMillionths(final byte[] stream, final int decStart) {
float millis=0;
final int c=stream[decStart]-48;
switch(c){
case 1:
millis=0.000001f;
break;
case 2:
millis=0.000002f;
break;
case 3:
millis=0.000003f;
break;
case 4:
millis=0.000004f;
break;
case 5:
millis=0.000005f;
break;
case 6:
millis=0.000006f;
break;
case 7:
millis=0.000007f;
break;
case 8:
millis=0.000008f;
break;
case 9:
millis=0.000009f;
break;
}
return millis;
}
private static float getHundredThousdandths(final byte[] stream, final int decStart) {
float hunthousands=0;
final int c=stream[decStart]-48;
switch(c){
case 1:
hunthousands=0.00001f;
break;
case 2:
hunthousands=0.00002f;
break;
case 3:
hunthousands=0.00003f;
break;
case 4:
hunthousands=0.00004f;
break;
case 5:
hunthousands=0.00005f;
break;
case 6:
hunthousands=0.00006f;
break;
case 7:
hunthousands=0.00007f;
break;
case 8:
hunthousands=0.00008f;
break;
case 9:
hunthousands=0.00009f;
break;
}
return hunthousands;
}
private static float getTenThousandths(final byte[] stream, final int decStart) {
float tenthousands=0;
final int c=stream[decStart]-48;
switch(c){
case 1:
tenthousands=0.0001f;
break;
case 2:
tenthousands=0.0002f;
break;
case 3:
tenthousands=0.0003f;
break;
case 4:
tenthousands=0.0004f;
break;
case 5:
tenthousands=0.0005f;
break;
case 6:
tenthousands=0.0006f;
break;
case 7:
tenthousands=0.0007f;
break;
case 8:
tenthousands=0.0008f;
break;
case 9:
tenthousands=0.0009f;
break;
}
return tenthousands;
}
private static float getThousandths(final byte[] stream, final int decStart) {
float thousands=0;
final int c=stream[decStart]-48;
switch(c){
case 1:
thousands=0.001f;
break;
case 2:
thousands=0.002f;
break;
case 3:
thousands=0.003f;
break;
case 4:
thousands=0.004f;
break;
case 5:
thousands=0.005f;
break;
case 6:
thousands=0.006f;
break;
case 7:
thousands=0.007f;
break;
case 8:
thousands=0.008f;
break;
case 9:
thousands=0.009f;
break;
}
return thousands;
}
private static float getHundredths(final byte[] stream, final int decStart) {
float hundredths=0;
final int c=stream[decStart]-48;
switch(c){
case 1:
hundredths=0.01f;
break;
case 2:
hundredths=0.02f;
break;
case 3:
hundredths=0.03f;
break;
case 4:
hundredths=0.04f;
break;
case 5:
hundredths=0.05f;
break;
case 6:
hundredths=0.06f;
break;
case 7:
hundredths=0.07f;
break;
case 8:
hundredths=0.08f;
break;
case 9:
hundredths=0.09f;
break;
}
return hundredths;
}
private static float getTenths(final byte[] stream, final int decStart) {
float tenths=0;
final int c=stream[decStart]-48;
switch(c){
case 1:
tenths=0.1f;
break;
case 2:
tenths=0.2f;
break;
case 3:
tenths=0.3f;
break;
case 4:
tenths=0.4f;
break;
case 5:
tenths=0.5f;
break;
case 6:
tenths=0.6f;
break;
case 7:
tenths=0.7f;
break;
case 8:
tenths=0.8f;
break;
case 9:
tenths=0.9f;
break;
}
return tenths;
}
private static float getUnits(final byte[] stream, final int intStart) {
float units=0;
final int c=stream[intStart]-48;
switch(c){
case 1:
units=1.0f;
break;
case 2:
units=2.0f;
break;
case 3:
units=3.0f;
break;
case 4:
units=4.0f;
break;
case 5:
units=5.0f;
break;
case 6:
units=6.0f;
break;
case 7:
units=7.0f;
break;
case 8:
units=8.0f;
break;
case 9:
units=9.0f;
break;
}
return units;
}
private static float getTens(final byte[] stream, final int intStart) {
float tens=0;
final int c=stream[intStart]-48;
switch(c){
case 1:
tens=10.0f;
break;
case 2:
tens=20.0f;
break;
case 3:
tens=30.0f;
break;
case 4:
tens=40.0f;
break;
case 5:
tens=50.0f;
break;
case 6:
tens=60.0f;
break;
case 7:
tens=70.0f;
break;
case 8:
tens=80.0f;
break;
case 9:
tens=90.0f;
break;
}
return tens;
}
private static float getHundreds(final byte[] stream, final int intStart) {
float hundreds=0;
final int c=stream[intStart]-48;
switch(c){
case 1:
hundreds=100.0f;
break;
case 2:
hundreds=200.0f;
break;
case 3:
hundreds=300.0f;
break;
case 4:
hundreds=400.0f;
break;
case 5:
hundreds=500.0f;
break;
case 6:
hundreds=600.0f;
break;
case 7:
hundreds=700.0f;
break;
case 8:
hundreds=800.0f;
break;
case 9:
hundreds=900.0f;
break;
}
return hundreds;
}
private static float getThousands(final byte[] stream, final int intStart) {
float thous=0;
final int c=stream[intStart]-48;
switch(c){
case 1:
thous=1000.0f;
break;
case 2:
thous=2000.0f;
break;
case 3:
thous=3000.0f;
break;
case 4:
thous=4000.0f;
break;
case 5:
thous=5000.0f;
break;
case 6:
thous=6000.0f;
break;
case 7:
thous=7000.0f;
break;
case 8:
thous=8000.0f;
break;
case 9:
thous=9000.0f;
break;
}
return thous;
}
}
© 2015 - 2024 Weber Informatics LLC | Privacy Policy