/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
package org.apache.harmony.unpack200;
import org.apache.harmony.pack200.Pack200Exception;
/**
* Stores the combinations of bit flags that can be used in the segment header
* options. Whilst this could be defined in {@link Segment}, it's cleaner to
* pull it out into a separate class, not least because methods can then be used
* to determine the semantic meaning of the flags. In languages with a
* pre-processor, these may be defined by macros that do bitflag manipulation
* instead.
*/
public class SegmentOptions {
private static final int DEFLATE_HINT = 1 << 5;
private static final int HAVE_ALL_CODE_FLAGS = 1 << 2;
private static final int HAVE_CLASS_FLAGS_HI = 1 << 9;
// private static final int UNUSED_3 = 2^3;
private static final int HAVE_CODE_FLAGS_HI = 1 << 10;
private static final int HAVE_CP_NUMBERS = 1 << 1;
private static final int HAVE_FIELD_FLAGS_HI = 1 << 10;
private static final int HAVE_FILE_HEADERS = 1 << 4;
private static final int HAVE_FILE_MODTIME = 1 << 6;
private static final int HAVE_FILE_OPTIONS = 1 << 7;
private static final int HAVE_FILE_SIZE_HI = 1 << 8;
private static final int HAVE_METHOD_FLAGS_HI = 1 << 11;
private static final int HAVE_SPECIAL_FORMATS = 1 << 0;
/**
* The bit flags that are defined as unused by the specification;
* specifically, every bit above bit 13 and bit 3.
*/
private static final int UNUSED = -1 << 13 | 1 << 3;
private int options;
/**
* Creates a new segment options with the given integer value.
*
* @param options
* the integer value to use as the flags
* @throws Pack200Exception
* if an unused bit (bit 3 or bit 13+) is non-zero
*/
public SegmentOptions(int options) throws Pack200Exception {
if ((options & UNUSED) != 0)
throw new Pack200Exception("Some unused flags are non-zero");
this.options = options;
}
public boolean hasAllCodeFlags() {
return (options & HAVE_ALL_CODE_FLAGS) != 0;
}
public boolean hasArchiveFileCounts() {
return (options & HAVE_FILE_HEADERS) != 0;
}
public boolean hasClassFlagsHi() {
return (options & HAVE_CLASS_FLAGS_HI) != 0;
}
public boolean hasCodeFlagsHi() {
return (options & HAVE_CODE_FLAGS_HI) != 0;
}
public boolean hasCPNumberCounts() {
return (options & HAVE_CP_NUMBERS) != 0;
}
public boolean hasFieldFlagsHi() {
return (options & HAVE_FIELD_FLAGS_HI) != 0;
}
public boolean hasFileModtime() {
return (options & HAVE_FILE_MODTIME) != 0;
}
public boolean hasFileOptions() {
return (options & HAVE_FILE_OPTIONS) != 0;
}
public boolean hasFileSizeHi() {
return (options & HAVE_FILE_SIZE_HI) != 0;
}
public boolean hasMethodFlagsHi() {
return (options & HAVE_METHOD_FLAGS_HI) != 0;
}
public boolean hasSpecialFormats() {
return (options & HAVE_SPECIAL_FORMATS) != 0;
}
public boolean shouldDeflate() {
return (options & DEFLATE_HINT) != 0;
}
}