96 lines
2.0 KiB
Java
96 lines
2.0 KiB
Java
/**
|
|
* fast data-reading from a byte-array
|
|
*
|
|
* @author ab
|
|
*/
|
|
package btools.util;
|
|
|
|
|
|
public class ByteDataReader
|
|
{
|
|
protected byte[] ab;
|
|
protected int aboffset;
|
|
|
|
public ByteDataReader( byte[] byteArray )
|
|
{
|
|
ab = byteArray;
|
|
}
|
|
|
|
public final int readInt()
|
|
{
|
|
int i3 = ab[aboffset++]& 0xff;
|
|
int i2 = ab[aboffset++]& 0xff;
|
|
int i1 = ab[aboffset++]& 0xff;
|
|
int i0 = ab[aboffset++]& 0xff;
|
|
return (i3 << 24) + (i2 << 16) + (i1 << 8) + i0;
|
|
}
|
|
|
|
public final long readLong()
|
|
{
|
|
long i7 = ab[aboffset++]& 0xff;
|
|
long i6 = ab[aboffset++]& 0xff;
|
|
long i5 = ab[aboffset++]& 0xff;
|
|
long i4 = ab[aboffset++]& 0xff;
|
|
long i3 = ab[aboffset++]& 0xff;
|
|
long i2 = ab[aboffset++]& 0xff;
|
|
long i1 = ab[aboffset++]& 0xff;
|
|
long i0 = ab[aboffset++]& 0xff;
|
|
return (i7 << 56) + (i6 << 48) + (i5 << 40) + (i4 << 32) + (i3 << 24) + (i2 << 16) + (i1 << 8) + i0;
|
|
}
|
|
|
|
public final boolean readBoolean()
|
|
{
|
|
int i0 = ab[aboffset++]& 0xff;
|
|
return i0 != 0;
|
|
}
|
|
|
|
public final byte readByte()
|
|
{
|
|
int i0 = ab[aboffset++] & 0xff;
|
|
return (byte)(i0);
|
|
}
|
|
|
|
public final short readShort()
|
|
{
|
|
int i1 = ab[aboffset++] & 0xff;
|
|
int i0 = ab[aboffset++] & 0xff;
|
|
return (short)( (i1 << 8) | i0);
|
|
}
|
|
|
|
public final int readVarLengthSigned()
|
|
{
|
|
int v = readVarLengthUnsigned();
|
|
return ( v & 1 ) == 0 ? v >> 1 : -(v >> 1 );
|
|
}
|
|
|
|
public final int readVarLengthUnsigned()
|
|
{
|
|
int v = 0;
|
|
int shift = 0;
|
|
for(;;)
|
|
{
|
|
int i7 = ab[aboffset++] & 0xff;
|
|
v |= (( i7 & 0x7f ) << shift);
|
|
if ( ( i7 & 0x80 ) == 0 ) break;
|
|
shift += 7;
|
|
}
|
|
return v;
|
|
}
|
|
|
|
public final void readFully( byte[] ta )
|
|
{
|
|
System.arraycopy( ab, aboffset, ta, 0, ta.length );
|
|
aboffset += ta.length;
|
|
}
|
|
|
|
@Override
|
|
public String toString()
|
|
{
|
|
StringBuilder sb = new StringBuilder( "[" );
|
|
for( int i=0; i<ab.length; i++ ) sb.append( i == 0 ? " " : ", " ).append( Integer.toString( ab[i] ) );
|
|
sb.append( " ]" );
|
|
return sb.toString();
|
|
}
|
|
|
|
}
|