SegmentUtils.java

  1. /*
  2.  *  Licensed to the Apache Software Foundation (ASF) under one or more
  3.  *  contributor license agreements.  See the NOTICE file distributed with
  4.  *  this work for additional information regarding copyright ownership.
  5.  *  The ASF licenses this file to You under the Apache License, Version 2.0
  6.  *  (the "License"); you may not use this file except in compliance with
  7.  *  the License.  You may obtain a copy of the License at
  8.  *
  9.  *     http://www.apache.org/licenses/LICENSE-2.0
  10.  *
  11.  *  Unless required by applicable law or agreed to in writing, software
  12.  *  distributed under the License is distributed on an "AS IS" BASIS,
  13.  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14.  *  See the License for the specific language governing permissions and
  15.  *  limitations under the License.
  16.  */
  17. package org.apache.commons.compress.harmony.unpack200;

  19. /**
  20.  * Utility class for unpack200
  21.  */
  22. public final class SegmentUtils {

  24.     public static int countArgs(final String descriptor) {
  25.         return countArgs(descriptor, 1);
  26.     }

  28.     /**
  29.      * Count the number of arguments in the descriptor. Each long or double counts as widthOfLongsAndDoubles; all other arguments count as 1.
  30.      *
  31.      * @param descriptor             String for which arguments are counted
  32.      * @param widthOfLongsAndDoubles int increment to apply for longs doubles. This is typically 1 when counting arguments alone, or 2 when counting arguments
  33.      *                               for invokeinterface.
  34.      * @return integer count
  35.      */
  36.     protected static int countArgs(final String descriptor, final int widthOfLongsAndDoubles) {
  37.         final int bra = descriptor.indexOf('(');
  38.         final int ket = descriptor.indexOf(')');
  39.         if (bra == -1 || ket == -1 || ket < bra) {
  40.             throw new IllegalArgumentException("No arguments");
  41.         }

  43.         boolean inType = false;
  44.         boolean consumingNextType = false;
  45.         int count = 0;
  46.         for (int i = bra + 1; i < ket; i++) {
  47.             final char charAt = descriptor.charAt(i);
  48.             if (inType && charAt == ';') {
  49.                 inType = false;
  50.                 consumingNextType = false;
  51.             } else if (!inType && charAt == 'L') {
  52.                 inType = true;
  53.                 count++;
  54.             } else if (charAt == '[') {
  55.                 consumingNextType = true;
  56.             } else if (inType) {
  57.                 // NOP
  58.             } else if (consumingNextType) {
  59.                 count++;
  60.                 consumingNextType = false;
  61.             } else if (charAt == 'D' || charAt == 'J') {
  62.                 count += widthOfLongsAndDoubles;
  63.             } else {
  64.                 count++;
  65.             }
  66.         }
  67.         return count;
  68.     }

  70.     public static int countBit16(final int[] flags) {
  71.         int count = 0;
  72.         for (final int flag : flags) {
  73.             if ((flag & 1 << 16) != 0) {
  74.                 count++;
  75.             }
  76.         }
  77.         return count;
  78.     }

  80.     public static int countBit16(final long[] flags) {
  81.         int count = 0;
  82.         for (final long flag : flags) {
  83.             if ((flag & 1 << 16) != 0) {
  84.                 count++;
  85.             }
  86.         }
  87.         return count;
  88.     }

  90.     public static int countBit16(final long[][] flags) {
  91.         int count = 0;
  92.         for (final long[] flag : flags) {
  93.             for (final long element : flag) {
  94.                 if ((element & 1 << 16) != 0) {
  95.                     count++;
  96.                 }
  97.             }
  98.         }
  99.         return count;
  100.     }

  102.     public static int countInvokeInterfaceArgs(final String descriptor) {
  103.         return countArgs(descriptor, 2);
  104.     }

  106.     public static int countMatches(final long[] flags, final IMatcher matcher) {
  107.         int count = 0;
  108.         for (final long flag : flags) {
  109.             if (matcher.matches(flag)) {
  110.                 count++;
  111.             }
  112.         }
  113.         return count;
  114.     }

  116.     public static int countMatches(final long[][] flags, final IMatcher matcher) {
  117.         int count = 0;
  118.         for (final long[] flag : flags) {
  119.             count += countMatches(flag, matcher);
  120.         }
  121.         return count;
  122.     }

  124. }
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