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Copy pathBits.java
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Copy pathBits.java
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117 lines (97 loc) · 3.34 KB
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/*
* Copyright (c) 2008-2014 MongoDB, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
// Bits.java
package org.bson.io;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
public class Bits {
public static void readFully( InputStream in, byte[] b )
throws IOException {
readFully( in , b , b.length );
}
public static void readFully( InputStream in, byte[] b, int length )
throws IOException {
readFully(in, b, 0, length);
}
public static void readFully( InputStream in, byte[] b, int startOffset, int length )
throws IOException {
if (b.length < length + startOffset) {
throw new IllegalArgumentException("Buffer is too small");
}
int offset = startOffset;
int toRead = length;
while ( toRead > 0 ){
int bytesRead = in.read( b, offset , toRead );
if ( bytesRead < 0 )
throw new EOFException();
toRead -= bytesRead;
offset += bytesRead;
}
}
public static int readInt( InputStream in )
throws IOException {
return readInt( in , new byte[4] );
}
public static int readInt( InputStream in , byte[] data )
throws IOException {
readFully(in, data, 4);
return readInt(data);
}
public static int readInt( byte[] data ) {
return readInt( data , 0 );
}
public static int readInt( byte[] data , int offset ) {
int x = 0;
x |= ( 0xFF & data[offset+0] ) << 0;
x |= ( 0xFF & data[offset+1] ) << 8;
x |= ( 0xFF & data[offset+2] ) << 16;
x |= ( 0xFF & data[offset+3] ) << 24;
return x;
}
public static int readIntBE( byte[] data , int offset ) {
int x = 0;
x |= ( 0xFF & data[offset+0] ) << 24;
x |= ( 0xFF & data[offset+1] ) << 16;
x |= ( 0xFF & data[offset+2] ) << 8;
x |= ( 0xFF & data[offset+3] ) << 0;
return x;
}
public static long readLong( InputStream in )
throws IOException {
return readLong( in , new byte[8] );
}
public static long readLong( InputStream in , byte[] data )
throws IOException {
readFully(in, data, 8);
return readLong(data);
}
public static long readLong( byte[] data ) {
return readLong( data , 0 );
}
public static long readLong( byte[] data , int offset ) {
long x = 0;
x |= ( 0xFFL & data[offset+0] ) << 0;
x |= ( 0xFFL & data[offset+1] ) << 8;
x |= ( 0xFFL & data[offset+2] ) << 16;
x |= ( 0xFFL & data[offset+3] ) << 24;
x |= ( 0xFFL & data[offset+4] ) << 32;
x |= ( 0xFFL & data[offset+5] ) << 40;
x |= ( 0xFFL & data[offset+6] ) << 48;
x |= ( 0xFFL & data[offset+7] ) << 56;
return x;
}
}