lowentry.ue4.classes.ByteDataReader Maven / Gradle / Ivy
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A Java library for the Low Entry UE4 plugins.
package lowentry.ue4.classes;
import lowentry.ue4.library.LowEntry;
/**
* This class is NOT thread safe!
*/
public abstract class ByteDataReader
{
protected int position = 0;
/**
* Creates a clone of this ByteDataReader.
*
* Allows you to easily read and revert the position (by cloning, reading data with the clone, and then throwing the clone away).
*/
public abstract ByteDataReader getClone();
protected abstract int getTotalCountImplementation();
protected abstract byte getByteImplementation(int index);
/**
* Returns the current position.
*/
public int position()
{
return position;
}
/**
* Sets the current position.
*/
public ByteDataReader position(int position)
{
this.position = Math.max(0, position);
return this;
}
/**
* Resets the current position to 0.
*/
public ByteDataReader reset()
{
position = 0;
return this;
}
/**
* Causes remaining() to return 0.
*/
public ByteDataReader empty()
{
position = getTotalCountImplementation();
return this;
}
/**
* Increases the position and returns the previous position.
*/
protected int getAndIncreasePosition(int increasement)
{
int count = getTotalCountImplementation();
int pos = position;
if((count - increasement) <= position)
{
position = count;
}
else
{
position += increasement;
}
return pos;
}
/**
* Returns the amount of bytes left.
*/
public int remaining()
{
return getTotalCountImplementation() - position;
}
/**
* Calculates how many elements can possible be remaining.
*/
protected int maxElementsRemaining(int minimumSizePerElement)
{
int remaining = remaining();
if(remaining <= 0)
{
return 0;
}
if(minimumSizePerElement <= 1)
{
return remaining;
}
return (remaining / minimumSizePerElement) + 1;
}
protected int getUinteger()
{
int count = getTotalCountImplementation();
int pos = getAndIncreasePosition(1);
if(count <= pos)
{
return 0;
}
byte b = getByteImplementation(pos);
if(((b >> 7) & 1) == 0)
{
return (b & 0xFF);
}
pos = getAndIncreasePosition(3);
if(count <= (pos + 2))
{
return 0;
}
int value = (((b & 0xFF) & ~(1 << 7)) << 24) | ((getByteImplementation(pos) & 0xFF) << 16) | ((getByteImplementation(pos + 1) & 0xFF) << 8) | (getByteImplementation(pos + 2) & 0xFF);
if(value < 128)
{
return 0;
}
return value;
}
/**
* Gets a byte.
*/
public byte getByte()
{
int pos = getAndIncreasePosition(1);
if(getTotalCountImplementation() <= pos)
{
return 0;
}
return getByteImplementation(pos);
}
/**
* Gets an integer.
*/
public int getInteger()
{
int count = getTotalCountImplementation();
int pos = getAndIncreasePosition(4);
if(count <= pos)
{
return 0;
}
if(count <= (pos + 1))
{
return (getByteImplementation(pos) & 0xFF);
}
if(count <= (pos + 2))
{
return ((getByteImplementation(pos) & 0xFF) << 8) | (getByteImplementation(pos + 1) & 0xFF);
}
if(count <= (pos + 3))
{
return ((getByteImplementation(pos) & 0xFF) << 16) | ((getByteImplementation(pos + 1) & 0xFF) << 8) | (getByteImplementation(pos + 2) & 0xFF);
}
return ((getByteImplementation(pos) & 0xFF) << 24) | ((getByteImplementation(pos + 1) & 0xFF) << 16) | ((getByteImplementation(pos + 2) & 0xFF) << 8) | (getByteImplementation(pos + 3) & 0xFF);
}
/**
* Gets a positive integer.
*/
public int getPositiveInteger1()
{
int count = getTotalCountImplementation();
int pos = getAndIncreasePosition(1);
if(count <= pos)
{
return 0;
}
byte b = getByteImplementation(pos);
if(((b >> 7) & 1) == 0)
{
return (b & 0xFF);
}
pos = getAndIncreasePosition(3);
if(count <= (pos + 2))
{
return 0;
}
int value = (((b & 0xFF) & ~(1 << 7)) << 24) | ((getByteImplementation(pos) & 0xFF) << 16) | ((getByteImplementation(pos + 1) & 0xFF) << 8) | (getByteImplementation(pos + 2) & 0xFF);
if(value < 128)
{
return 0;
}
return value;
}
/**
* Gets a positive integer.
*/
public int getPositiveInteger2()
{
int count = getTotalCountImplementation();
int pos = getAndIncreasePosition(2);
if(count <= (pos + 1))
{
return 0;
}
byte b1 = getByteImplementation(pos);
byte b2 = getByteImplementation(pos + 1);
if(((b1 >> 7) & 1) == 0)
{
return ((b1 & 0xFF) << 8) | (b2 & 0xFF);
}
pos = getAndIncreasePosition(2);
if(count <= (pos + 1))
{
return 0;
}
int value = (((b1 & 0xFF) & ~(1 << 7)) << 24) | ((b2 & 0xFF) << 16) | ((getByteImplementation(pos) & 0xFF) << 8) | (getByteImplementation(pos + 1) & 0xFF);
if(value < 32768)
{
return 0;
}
return value;
}
/**
* Gets a positive integer.
*/
public int getPositiveInteger3()
{
int count = getTotalCountImplementation();
int pos = getAndIncreasePosition(3);
if(count <= (pos + 2))
{
return 0;
}
byte b1 = getByteImplementation(pos);
byte b2 = getByteImplementation(pos + 1);
byte b3 = getByteImplementation(pos + 2);
if(((b1 >> 7) & 1) == 0)
{
return ((b1 & 0xFF) << 16) | ((b2 & 0xFF) << 8) | (b3 & 0xFF);
}
pos = getAndIncreasePosition(1);
if(count <= pos)
{
return 0;
}
int value = (((b1 & 0xFF) & ~(1 << 7)) << 24) | ((b2 & 0xFF) << 16) | ((b3 & 0xFF) << 8) | (getByteImplementation(pos) & 0xFF);
if(value < 8388608)
{
return 0;
}
return value;
}
/**
* Gets a long.
*/
public long getLong()
{
int count = getTotalCountImplementation();
int pos = getAndIncreasePosition(8);
if(count <= pos)
{
return 0;
}
if(count <= (pos + 1))
{
return ((long) getByteImplementation(pos) & 0xFF);
}
if(count <= (pos + 2))
{
return (((long) getByteImplementation(pos) & 0xFF) << 8) | ((long) getByteImplementation(pos + 1) & 0xFF);
}
if(count <= (pos + 3))
{
return (((long) getByteImplementation(pos) & 0xFF) << 16) | (((long) getByteImplementation(pos + 1) & 0xFF) << 8) | ((long) getByteImplementation(pos + 2) & 0xFF);
}
if(count <= (pos + 4))
{
return (((long) getByteImplementation(pos) & 0xFF) << 24) | (((long) getByteImplementation(pos + 1) & 0xFF) << 16) | (((long) getByteImplementation(pos + 2) & 0xFF) << 8) | ((long) getByteImplementation(pos + 3) & 0xFF);
}
if(count <= (pos + 5))
{
return (((long) getByteImplementation(pos) & 0xFF) << 32) | (((long) getByteImplementation(pos + 1) & 0xFF) << 24) | (((long) getByteImplementation(pos + 2) & 0xFF) << 16) | (((long) getByteImplementation(pos + 3) & 0xFF) << 8) | ((long) getByteImplementation(pos + 4) & 0xFF);
}
if(count <= (pos + 6))
{
return (((long) getByteImplementation(pos) & 0xFF) << 40) | (((long) getByteImplementation(pos + 1) & 0xFF) << 32) | (((long) getByteImplementation(pos + 2) & 0xFF) << 24) | (((long) getByteImplementation(pos + 3) & 0xFF) << 16) | (((long) getByteImplementation(pos + 4) & 0xFF) << 8) | ((long) getByteImplementation(pos + 5) & 0xFF);
}
if(count <= (pos + 7))
{
return (((long) getByteImplementation(pos) & 0xFF) << 48) | (((long) getByteImplementation(pos + 1) & 0xFF) << 40) | (((long) getByteImplementation(pos + 2) & 0xFF) << 32) | (((long) getByteImplementation(pos + 3) & 0xFF) << 24) | (((long) getByteImplementation(pos + 4) & 0xFF) << 16) | (((long) getByteImplementation(pos + 5) & 0xFF) << 8) | ((long) getByteImplementation(pos + 6) & 0xFF);
}
return (((long) getByteImplementation(pos) & 0xFF) << 56) | (((long) getByteImplementation(pos + 1) & 0xFF) << 48) | (((long) getByteImplementation(pos + 2) & 0xFF) << 40) | (((long) getByteImplementation(pos + 3) & 0xFF) << 32) | (((long) getByteImplementation(pos + 4) & 0xFF) << 24) | (((long) getByteImplementation(pos + 5) & 0xFF) << 16) | (((long) getByteImplementation(pos + 6) & 0xFF) << 8) | ((long) getByteImplementation(pos + 7) & 0xFF);
}
/**
* Gets a float.
*/
public float getFloat()
{
return Float.intBitsToFloat(getInteger());
}
/**
* Gets a double.
*/
public double getDouble()
{
return Double.longBitsToDouble(getLong());
}
/**
* Gets a boolean.
*/
public boolean getBoolean()
{
int pos = getAndIncreasePosition(1);
if(getTotalCountImplementation() <= pos)
{
return false;
}
return (getByteImplementation(pos) == LowEntry.BOOLEAN_TRUE_BYTE);
}
/**
* Gets a String (UTF-8).
*/
public String getStringUtf8()
{
int count = getTotalCountImplementation();
int length = getUinteger();
if(length <= 0)
{
return "";
}
int pos = getAndIncreasePosition(length);
if(count <= pos)
{
return "";
}
int maxLength = count - pos;
if(length > maxLength)
{
length = maxLength;
}
return getStringUtf8Implementation(pos, length);
}
protected abstract String getStringUtf8Implementation(int index, int length);
/**
* Gets a String (Latin-1, ISO-8859-1).
*/
public String getStringLatin1()
{
int count = getTotalCountImplementation();
int length = getUinteger();
if(length <= 0)
{
return "";
}
int pos = getAndIncreasePosition(length);
if(count <= pos)
{
return "";
}
int maxLength = count - pos;
if(length > maxLength)
{
length = maxLength;
}
return getStringLatin1Implementation(pos, length);
}
protected abstract String getStringLatin1Implementation(int index, int length);
/**
* Gets a byte array.
*/
public byte[] getByteArray()
{
int count = getTotalCountImplementation();
int length = getUinteger();
if(length <= 0)
{
return new byte[0];
}
int pos = getAndIncreasePosition(length);
if(count <= pos)
{
return new byte[0];
}
int maxLength = count - pos;
if(length > maxLength)
{
length = maxLength;
}
return getByteArrayImplementation(pos, length);
}
protected abstract byte[] getByteArrayImplementation(int index, int length);
/**
* Gets an integer array.
*/
public int[] getIntegerArray()
{
int length = getUinteger();
length = Math.min(length, maxElementsRemaining(4));
if(length <= 0)
{
return new int[0];
}
int[] array = new int[length];
for(int i = 0; i < length; i++)
{
array[i] = getInteger();
}
return array;
}
/**
* Gets a positive integer array.
*/
public int[] getPositiveInteger1Array()
{
int length = getUinteger();
length = Math.min(length, maxElementsRemaining(1));
if(length <= 0)
{
return new int[0];
}
int[] array = new int[length];
for(int i = 0; i < length; i++)
{
array[i] = getPositiveInteger1();
}
return array;
}
/**
* Gets a positive integer array.
*/
public int[] getPositiveInteger2Array()
{
int length = getUinteger();
length = Math.min(length, maxElementsRemaining(2));
if(length <= 0)
{
return new int[0];
}
int[] array = new int[length];
for(int i = 0; i < length; i++)
{
array[i] = getPositiveInteger2();
}
return array;
}
/**
* Gets a positive integer array.
*/
public int[] getPositiveInteger3Array()
{
int length = getUinteger();
length = Math.min(length, maxElementsRemaining(3));
if(length <= 0)
{
return new int[0];
}
int[] array = new int[length];
for(int i = 0; i < length; i++)
{
array[i] = getPositiveInteger3();
}
return array;
}
/**
* Gets a long array.
*/
public long[] getLongArray()
{
int length = getUinteger();
length = Math.min(length, maxElementsRemaining(8));
if(length <= 0)
{
return new long[0];
}
long[] array = new long[length];
for(int i = 0; i < length; i++)
{
array[i] = getLong();
}
return array;
}
/**
* Gets a float array.
*/
public float[] getFloatArray()
{
int length = getUinteger();
length = Math.min(length, maxElementsRemaining(4));
if(length <= 0)
{
return new float[0];
}
float[] array = new float[length];
for(int i = 0; i < length; i++)
{
array[i] = getFloat();
}
return array;
}
/**
* Gets a double array.
*/
public double[] getDoubleArray()
{
int length = getUinteger();
length = Math.min(length, maxElementsRemaining(8));
if(length <= 0)
{
return new double[0];
}
double[] array = new double[length];
for(int i = 0; i < length; i++)
{
array[i] = getDouble();
}
return array;
}
/**
* Gets a boolean array.
*/
public boolean[] getBooleanArray()
{
int length = getUinteger();
length = Math.min(length, safeMultiply(maxElementsRemaining(1), 8));
if(length <= 0)
{
return new boolean[0];
}
boolean[] array = new boolean[length];
for(int i = 0; i < length; i += 8)
{
byte b = getByte();
for(int bIndex = 0; bIndex < 8; bIndex++)
{
int index = i + bIndex;
if(index >= length)
{
return array;
}
array[index] = (((b >> (7 - bIndex)) & 1) != 0);
}
}
return array;
}
/**
* Gets a String (UTF-8) array.
*/
public String[] getStringUtf8Array()
{
int length = getUinteger();
length = Math.min(length, maxElementsRemaining(1));
if(length <= 0)
{
return new String[0];
}
String[] array = new String[length];
for(int i = 0; i < length; i++)
{
array[i] = getStringUtf8();
}
return array;
}
/**
* Gets a String (Latin-1, ISO-8859-1) array.
*/
public String[] getStringLatin1Array()
{
int length = getUinteger();
length = Math.min(length, maxElementsRemaining(1));
if(length <= 0)
{
return new String[0];
}
String[] array = new String[length];
for(int i = 0; i < length; i++)
{
array[i] = getStringLatin1();
}
return array;
}
protected static int safeMultiply(int a, int b)
{
long result = (long) a * (long) b;
if(result > Integer.MAX_VALUE)
{
return Integer.MAX_VALUE;
}
if(result < Integer.MIN_VALUE)
{
return Integer.MIN_VALUE;
}
return (int) result;
}
}
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