package org.infinispan.server.core.transport;
import io.netty.buffer.ByteBuf;
/**
* Reads and writes unsigned variable length integer values. Even though it's deprecated, do not
* remove from source code for the moment because it's a good scala example and could be used
* as reference.
*
* @author Galder ZamarreƱo
* @since 4.1
*/
public class VInt {
public static void write(ByteBuf out, int i) {
if ((i & ~0x7F) == 0) out.writeByte(i);
else {
out.writeByte(((i & 0x7f) | 0x80));
write(out, i >>> 7);
}
}
public static int read(ByteBuf in) {
byte b = in.readByte();
return read(in, b, 7, b & 0x7F, 1);
}
private static int read(ByteBuf in, byte b, int shift, int i, int count) {
if ((b & 0x80) == 0) return i;
else {
if (count > 5)
throw new IllegalStateException(
"Stream corrupted. A variable length integer cannot be longer than 5 bytes.");
byte bb = in.readByte();
return read(in, bb, shift + 7, i | (int) ((bb & 0x7FL) << shift), count + 1);
}
}
}