org.jpedal.utils.NumberUtils Maven / Gradle / Ivy
/*
* ===========================================
* Java Pdf Extraction Decoding Access Library
* ===========================================
*
* Project Info: http://www.idrsolutions.com
* Help section for developers at http://www.idrsolutions.com/support/
*
* (C) Copyright 1997-2017 IDRsolutions and Contributors.
*
* This file is part of JPedal/JPDF2HTML5
*
@LICENSE@
*
* ---------------
* 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(final byte[] stream, int intStart, int decStart, final int intNumbers, final int decNumbers) {
final double dec;
final double num;
final 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(final byte[] stream, int intStart, int decStart, final int intNumbers, final int decNumbers) {
final float dec;
final float num;
final 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;
}
}
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