/*
* Copyright (c) 2001, 2005, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
package sun.jvm.hotspot.oops;
import sun.jvm.hotspot.code.*;
import sun.jvm.hotspot.debugger.*;
public class CompressedLineNumberReadStream extends CompressedReadStream {
/** Equivalent to CompressedLineNumberReadStream(buffer, 0) */
public CompressedLineNumberReadStream(Address buffer) {
this(buffer, 0);
}
public CompressedLineNumberReadStream(Address buffer, int position) {
super(buffer, position);
}
/** Read (bci, line number) pair from stream. Returns false at end-of-stream. */
public boolean readPair() {
int next = readByte() & 0xFF;
// Check for terminator
if (next == 0) return false;
if (next == 0xFF) {
// Escape character, regular compression used
bci += readSignedInt();
line += readSignedInt();
} else {
// Single byte compression used
bci += next >> 3;
line += next & 0x7;
}
return true;
}
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