710 lines
26 KiB
Java
710 lines
26 KiB
Java
package com.bytezone.diskbrowser.utilities;
|
|
|
|
import java.awt.Graphics2D;
|
|
import java.awt.geom.AffineTransform;
|
|
import java.io.BufferedInputStream;
|
|
import java.io.File;
|
|
import java.io.FileInputStream;
|
|
import java.io.IOException;
|
|
import java.math.BigDecimal;
|
|
import java.math.MathContext;
|
|
import java.time.DateTimeException;
|
|
import java.time.LocalDateTime;
|
|
import java.util.Arrays;
|
|
import java.util.GregorianCalendar;
|
|
import java.util.List;
|
|
import java.util.zip.CRC32;
|
|
import java.util.zip.Checksum;
|
|
|
|
// -----------------------------------------------------------------------------------//
|
|
public final class Utility
|
|
// -----------------------------------------------------------------------------------//
|
|
{
|
|
public static final byte ASCII_BACKSPACE = 0x08;
|
|
public static final byte ASCII_LF = 0x0A;
|
|
public static final byte ASCII_CR = 0x0D;
|
|
public static final byte ASCII_QUOTE = 0x22;
|
|
public static final byte ASCII_DOLLAR = 0x24;
|
|
public static final byte ASCII_PERCENT = 0x25;
|
|
public static final byte ASCII_LEFT_BRACKET = 0x28;
|
|
public static final byte ASCII_RIGHT_BRACKET = 0x29;
|
|
public static final byte ASCII_COMMA = 0x2C;
|
|
public static final byte ASCII_MINUS = 0x2D;
|
|
public static final byte ASCII_DOT = 0x2E;
|
|
public static final byte ASCII_COLON = 0x3A;
|
|
public static final byte ASCII_SEMI_COLON = 0x3B;
|
|
public static final byte ASCII_EQUALS = 0x3D;
|
|
public static final byte ASCII_CARET = 0x5E;
|
|
|
|
private static MathContext mathContext = new MathContext (9);
|
|
private static MathContext mathContext4 = new MathContext (6);
|
|
private static MathContext mathContext8 = new MathContext (15);
|
|
|
|
private static final List<String> suffixes = Arrays.asList ("po", "dsk", "do", "hdv",
|
|
"2mg", "d13", "sdk", "shk", "bxy", "bny", "woz", "img", "dimg");
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
private Utility ()
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static int getTotalSuffixes ()
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
return suffixes.size ();
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static String getSuffix (int index)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
return suffixes.get (index);
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static boolean test (Graphics2D g)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
return g.getFontRenderContext ().getTransform ()
|
|
.equals (AffineTransform.getScaleInstance (2.0, 2.0));
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static void printStackTrace ()
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
for (StackTraceElement ste : java.lang.Thread.currentThread ().getStackTrace ())
|
|
System.out.println (ste);
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static String rtrim (StringBuilder text)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
while (text.length () > 0 && text.charAt (text.length () - 1) == '\n')
|
|
text.deleteCharAt (text.length () - 1);
|
|
return text.toString ();
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static int getIndent (StringBuilder fullText)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
int ptr = fullText.length () - 1;
|
|
int indent = 0;
|
|
while (ptr >= 0 && fullText.charAt (ptr) != '\n')
|
|
{
|
|
--ptr;
|
|
++indent;
|
|
}
|
|
return indent;
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
// public static int getLong (byte[] buffer, int ptr)
|
|
// //
|
|
// ---------------------------------------------------------------------------------//
|
|
// {
|
|
// return getWord (buffer, ptr) + getWord (buffer, ptr + 2) * 0x10000;
|
|
// }
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
// public static int getWord (byte[] buffer, int ptr)
|
|
// //
|
|
// ---------------------------------------------------------------------------------//
|
|
// {
|
|
// int a = (buffer[ptr + 1] & 0xFF) << 8;
|
|
// int b = buffer[ptr] & 0xFF;
|
|
// return a + b;
|
|
// }
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static int intValue (byte b1, byte b2)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
return (b1 & 0xFF) | ((b2 & 0xFF) << 8);
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static int intValue (byte b1, byte b2, byte b3)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
return (b1 & 0xFF) | ((b2 & 0xFF) << 8) | ((b3 & 0xFF) << 16);
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static int getLong (byte[] buffer, int ptr)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
try
|
|
{
|
|
int val = 0;
|
|
for (int i = 3; i >= 0; i--)
|
|
{
|
|
val <<= 8;
|
|
val += buffer[ptr + i] & 0xFF;
|
|
}
|
|
return val;
|
|
}
|
|
catch (ArrayIndexOutOfBoundsException e)
|
|
{
|
|
System.out.printf ("Index out of range (getLong): %08X %<d%n", ptr);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static int getLongBigEndian (byte[] buffer, int ptr)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
int val = 0;
|
|
for (int i = 0; i < 4; i++)
|
|
{
|
|
val <<= 8;
|
|
val += buffer[ptr + i] & 0xFF;
|
|
}
|
|
return val;
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
// public static int getWordBigEndian (byte[] buffer, int ptr)
|
|
// //
|
|
// ---------------------------------------------------------------------------------//
|
|
// {
|
|
// int val = 0;
|
|
// for (int i = 0; i < 2; i++)
|
|
// {
|
|
// val <<= 8;
|
|
// val += buffer[ptr + i] & 0xFF;
|
|
// }
|
|
// return val;
|
|
// }
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static int getShort (byte[] buffer, int ptr)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
try
|
|
{
|
|
return (buffer[ptr] & 0xFF) | ((buffer[ptr + 1] & 0xFF) << 8);
|
|
}
|
|
catch (ArrayIndexOutOfBoundsException e)
|
|
{
|
|
System.out.printf ("Index out of range (getShort): %04X %<d%n", ptr);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static int signedShort (byte[] buffer, int ptr)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
// if (ptr >= buffer.length)
|
|
// {
|
|
// System.out.println ("Index out of range (signed short): " + ptr);
|
|
// return 0;
|
|
// }
|
|
try
|
|
{
|
|
return (short) ((buffer[ptr] & 0xFF) | ((buffer[ptr + 1] & 0xFF) << 8));
|
|
}
|
|
catch (ArrayIndexOutOfBoundsException e)
|
|
{
|
|
System.out.printf ("Index out of range (signedShort): %04X %<d%n", ptr);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static int getShortBigEndian (byte[] buffer, int ptr)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
int val = 0;
|
|
for (int i = 0; i < 2; i++)
|
|
{
|
|
val <<= 8;
|
|
val |= buffer[ptr + i] & 0xFF;
|
|
}
|
|
return val;
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static LocalDateTime getAppleDate (byte[] buffer, int offset)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
// int yymmdd = readShort (buffer, offset);
|
|
int yymmdd = getShort (buffer, offset);
|
|
if (yymmdd != 0)
|
|
{
|
|
int year = (yymmdd & 0xFE00) >> 9;
|
|
int month = (yymmdd & 0x01E0) >> 5;
|
|
int day = yymmdd & 0x001F;
|
|
|
|
int minute = buffer[offset + 2] & 0x3F;
|
|
int hour = buffer[offset + 3] & 0x1F;
|
|
|
|
if (hour > 23)
|
|
hour = 0;
|
|
if (minute > 59)
|
|
minute = 0;
|
|
|
|
if (year < 70)
|
|
year += 2000;
|
|
else
|
|
year += 1900;
|
|
|
|
try
|
|
{
|
|
return LocalDateTime.of (year, month, day, hour, minute);
|
|
}
|
|
catch (DateTimeException e)
|
|
{
|
|
System.out.printf ("Bad date/time: %d %d %d %d %d %n", year, month, day, hour,
|
|
minute);
|
|
}
|
|
}
|
|
|
|
return null;
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static void putAppleDate (byte[] buffer, int offset, LocalDateTime date)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
if (date != null)
|
|
{
|
|
int year = date.getYear ();
|
|
int month = date.getMonthValue ();
|
|
int day = date.getDayOfMonth ();
|
|
int hour = date.getHour ();
|
|
int minute = date.getMinute ();
|
|
|
|
if (year < 2000)
|
|
year -= 1900;
|
|
else
|
|
year -= 2000;
|
|
|
|
int val1 = year << 9 | month << 5 | day;
|
|
writeShort (buffer, offset, val1);
|
|
buffer[offset + 2] = (byte) minute;
|
|
buffer[offset + 3] = (byte) hour;
|
|
}
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static void writeShort (byte[] buffer, int ptr, int value)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
buffer[ptr] = (byte) (value & 0xFF);
|
|
buffer[ptr + 1] = (byte) ((value & 0xFF00) >>> 8);
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static void writeTriple (byte[] buffer, int ptr, int value)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
buffer[ptr] = (byte) (value & 0xFF);
|
|
buffer[ptr + 1] = (byte) ((value & 0xFF00) >>> 8);
|
|
buffer[ptr + 2] = (byte) ((value & 0xFF0000) >>> 16);
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
// public static int readShort (byte[] buffer, int ptr)
|
|
// //
|
|
// ---------------------------------------------------------------------------------//
|
|
// {
|
|
// return (buffer[ptr] & 0xFF) | (buffer[ptr + 1] & 0xFF) << 8;
|
|
// }
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static int readTriple (byte[] buffer, int ptr)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
return (buffer[ptr] & 0xFF) | (buffer[ptr + 1] & 0xFF) << 8
|
|
| (buffer[ptr + 2] & 0xFF) << 16;
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static String matchFlags (int flag, String[] chars)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
int weight = (int) Math.pow (2, chars.length - 1);
|
|
StringBuilder text = new StringBuilder ();
|
|
|
|
for (int i = 0; i < chars.length; i++)
|
|
{
|
|
if ((flag & weight) != 0)
|
|
text.append (chars[i]);
|
|
else
|
|
text.append (".");
|
|
weight >>>= 1;
|
|
}
|
|
|
|
return text.toString ();
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static double getSANEDouble (byte[] buffer, int offset)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
long bits = 0;
|
|
for (int i = 7; i >= 0; i--)
|
|
{
|
|
bits <<= 8;
|
|
bits |= buffer[offset + i] & 0xFF;
|
|
}
|
|
|
|
return Double.longBitsToDouble (bits);
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static double floatValue (byte[] buffer, int ptr)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
int exponent = buffer[ptr] & 0x7F; // biased 128
|
|
if (exponent == 0)
|
|
return 0.0;
|
|
|
|
int mantissa = (buffer[ptr + 1] & 0x7F) << 24 | (buffer[ptr + 2] & 0xFF) << 16
|
|
| (buffer[ptr + 3] & 0xFF) << 8 | (buffer[ptr + 4] & 0xFF);
|
|
boolean negative = (buffer[ptr + 1] & 0x80) != 0;
|
|
double value = 0.5;
|
|
|
|
for (int i = 2, weight = 0x40_00_00_00; i <= 32; i++, weight >>>= 1)
|
|
if ((mantissa & weight) > 0)
|
|
value += Math.pow (0.5, i);
|
|
|
|
value *= Math.pow (2, exponent);
|
|
BigDecimal bd = new BigDecimal (value);
|
|
double rounded = bd.round (mathContext).doubleValue ();
|
|
|
|
return negative ? rounded * -1 : rounded;
|
|
}
|
|
|
|
// https://en.wikipedia.org/wiki/Microsoft_Binary_Format
|
|
// ---------------------------------------------------------------------------------//
|
|
public static double floatValueMS4 (byte[] buffer, int ptr)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
int exponent = buffer[ptr + 3] & 0x7F; // biased 128
|
|
if (exponent == 0)
|
|
return 0.0;
|
|
|
|
int mantissa = (buffer[ptr + 2] & 0x7F) << 16 | (buffer[ptr + 1] & 0xFF) << 8
|
|
| (buffer[ptr] & 0xFF);
|
|
boolean negative = (buffer[ptr + 2] & 0x80) != 0;
|
|
double value = 0.5;
|
|
|
|
for (int i = 2, weight = 0x40_00_00; i <= 23; i++, weight >>>= 1)
|
|
if ((mantissa & weight) != 0)
|
|
value += Math.pow (0.5, i);
|
|
|
|
value *= Math.pow (2, exponent);
|
|
BigDecimal bd = new BigDecimal (value);
|
|
double rounded = bd.round (mathContext4).doubleValue ();
|
|
|
|
return negative ? rounded * -1 : rounded;
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static double floatValueMS8 (byte[] buffer, int ptr)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
int exponent = buffer[ptr + 7] & 0x7F; // biased 128
|
|
if (exponent == 0)
|
|
return 0.0;
|
|
|
|
long mantissa = (long) (buffer[ptr + 6] & 0x7F) << 48
|
|
| (long) (buffer[ptr + 5] & 0xFF) << 40 | (long) (buffer[ptr + 4] & 0xFF) << 32
|
|
| (long) (buffer[ptr + 3] & 0xFF) << 24 | (buffer[ptr + 2] & 0xFF) << 16
|
|
| (buffer[ptr + 1] & 0xFF) << 8 | (buffer[ptr] & 0xFF);
|
|
boolean negative = (buffer[ptr + 6] & 0x80) != 0;
|
|
double value = 0.5;
|
|
|
|
long weight = 0x40_00_00_00_00_00_00L;
|
|
for (int i = 2; i <= 55; i++, weight >>>= 1)
|
|
if ((mantissa & weight) != 0)
|
|
value += Math.pow (0.5, i);
|
|
|
|
value *= Math.pow (2, exponent);
|
|
BigDecimal bd = new BigDecimal (value);
|
|
double rounded = bd.round (mathContext8).doubleValue ();
|
|
|
|
return negative ? rounded * -1 : rounded;
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static GregorianCalendar getPascalDate (byte[] buffer, int offset)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
int date = Utility.getShort (buffer, offset);
|
|
|
|
int month = date & 0x0F;
|
|
int day = (date & 0x1F0) >>> 4;
|
|
int year = (date & 0xFE00) >>> 9;
|
|
|
|
if (year < 70)
|
|
year += 2000;
|
|
else
|
|
year += 1900;
|
|
|
|
return new GregorianCalendar (year, month - 1, day);
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static int dimension (int chars, int border, int size, int gap)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
return border * 2 + chars * (size + gap) - gap;
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static boolean find (byte[] buffer, byte[] key)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
for (int i = 0; i < buffer.length; i++)
|
|
if (matches (buffer, i, key))
|
|
{
|
|
System.out.printf ("Matches at %04X%n", i);
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static boolean matches (byte[] buffer, int offset, byte[] key)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
int ptr = 0;
|
|
while (offset < buffer.length && ptr < key.length)
|
|
if (buffer[offset++] != key[ptr++])
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static LocalDateTime getDateTime (byte[] buffer, int ptr)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
try
|
|
{
|
|
int[] val = new int[6];
|
|
for (int i = 0; i < 6; i++)
|
|
val[i] = Integer.parseInt (String.format ("%02X", buffer[ptr + i] & 0xFF));
|
|
|
|
LocalDateTime date =
|
|
LocalDateTime.of (val[3] + 2000, val[5], val[4], val[2], val[1], val[0]);
|
|
return date;
|
|
}
|
|
catch (DateTimeException | NumberFormatException e)
|
|
{
|
|
return null;
|
|
}
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static int getSuffixNo (String filename)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
return suffixes.indexOf (getSuffix (filename));
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static String getSuffix (String filename)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
String lcFilename = filename.toLowerCase ();
|
|
|
|
if (lcFilename.endsWith (".gz"))
|
|
lcFilename = lcFilename.substring (0, lcFilename.length () - 3);
|
|
else if (lcFilename.endsWith (".zip"))
|
|
lcFilename = lcFilename.substring (0, lcFilename.length () - 4);
|
|
|
|
int dotPos = lcFilename.lastIndexOf ('.');
|
|
if (dotPos < 0)
|
|
return "";
|
|
|
|
return lcFilename.substring (dotPos + 1);
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static boolean validFileType (String filename)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
if (filename.startsWith (".")) // ignore invisible files
|
|
return false;
|
|
return suffixes.contains (getSuffix (filename));
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static void reverse (byte[] buffer)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
int lo = 0;
|
|
int hi = buffer.length - 1;
|
|
|
|
while (lo < hi)
|
|
{
|
|
byte temp = buffer[lo];
|
|
buffer[lo++] = buffer[hi];
|
|
buffer[hi--] = temp;
|
|
}
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static boolean isHighBitSet (byte value)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
return (value & 0x80) != 0;
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static boolean isControlCharacter (byte value)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
int val = value & 0xFF;
|
|
return val > 0 && val < 32;
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static boolean isDigit (byte value)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
return value >= 0x30 && value <= 0x39;
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static boolean isLetter (byte value)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
return value >= 0x41 && value <= 0x5A;
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static boolean isPossibleVariable (byte value)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
return isDigit (value) || isLetter (value) || value == ASCII_DOLLAR
|
|
|| value == ASCII_PERCENT;
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static boolean isPossibleNumber (byte value)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
return isDigit (value) || value == ASCII_DOT;
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static boolean isMagic (byte[] buffer, int ptr, byte[] magic)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
if (ptr + magic.length >= buffer.length)
|
|
return false;
|
|
|
|
for (int i = 0; i < magic.length; i++)
|
|
if (buffer[ptr + i] != magic[i])
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static long getChecksumValue (File file)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
Checksum checksum = new CRC32 ();
|
|
try
|
|
{
|
|
BufferedInputStream is =
|
|
new BufferedInputStream (new FileInputStream (file.getAbsolutePath ()));
|
|
byte[] bytes = new byte[1024];
|
|
int len = 0;
|
|
|
|
while ((len = is.read (bytes)) >= 0)
|
|
checksum.update (bytes, 0, len);
|
|
|
|
is.close ();
|
|
}
|
|
catch (IOException e)
|
|
{
|
|
e.printStackTrace ();
|
|
}
|
|
return checksum.getValue ();
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static int getCRC (final byte[] buffer, int length, int initialValue)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
int crc = initialValue;
|
|
for (int j = 0; j < length; j++)
|
|
{
|
|
crc = ((crc >>> 8) | (crc << 8)) & 0xFFFF;
|
|
crc ^= (buffer[j] & 0xFF);
|
|
crc ^= ((crc & 0xFF) >>> 4);
|
|
crc ^= (crc << 12) & 0xFFFF;
|
|
crc ^= ((crc & 0xFF) << 5) & 0xFFFF;
|
|
}
|
|
|
|
crc &= 0xFFFF;
|
|
|
|
return crc;
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
public static int crc32 (byte[] buffer, int offset, int length)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
int crc = 0xFFFFFFFF; // one's complement of zero
|
|
int eof = offset + length;
|
|
|
|
for (int i = offset; i < eof; i++)
|
|
crc = crc32_tab[(crc ^ buffer[i]) & 0xFF] ^ (crc >>> 8);
|
|
|
|
return ~crc; // one's complement
|
|
}
|
|
|
|
static int[] crc32_tab = { 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
|
|
0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
|
|
0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148,
|
|
0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856, 0x646ba8c0,
|
|
0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8,
|
|
0x4c69105e, 0xd56041e4, 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
|
|
0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf,
|
|
0xabd13d59, 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
|
|
0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 0x2f6f7c87,
|
|
0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a,
|
|
0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e,
|
|
0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162,
|
|
0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6,
|
|
0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
|
|
0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d,
|
|
0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5,
|
|
0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525,
|
|
0x206f85b3, 0xb966d409, 0xce61e49f, 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4,
|
|
0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c,
|
|
0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
|
|
0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344,
|
|
0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
|
|
0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43,
|
|
0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767,
|
|
0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3,
|
|
0xa867df55, 0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
|
|
0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92,
|
|
0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226,
|
|
0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, 0x95bf4a82,
|
|
0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
|
|
0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1,
|
|
0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
|
|
0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661,
|
|
0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0,
|
|
0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, 0xbdbdf21c, 0xcabac28a, 0x53b39330,
|
|
0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8,
|
|
0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d };
|
|
} |