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      1 /*
      2  * Copyright (C) 2011 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.internal.telephony.uicc;
     18 
     19 import android.telephony.Rlog;
     20 
     21 /**
     22  * Wrapper class for an ICC EF containing a bit field of enabled services.
     23  */
     24 public abstract class IccServiceTable {
     25     protected final byte[] mServiceTable;
     26 
     27     protected IccServiceTable(byte[] table) {
     28         mServiceTable = table;
     29     }
     30 
     31     // Get the class name to use for log strings
     32     protected abstract String getTag();
     33 
     34     // Get the array of enums to use for toString
     35     protected abstract Object[] getValues();
     36 
     37     /**
     38      * Returns if the specified service is available.
     39      * @param service the service number as a zero-based offset (the enum ordinal)
     40      * @return true if the service is available; false otherwise
     41      */
     42     protected boolean isAvailable(int service) {
     43         int offset = service / 8;
     44         if (offset >= mServiceTable.length) {
     45             // Note: Enums are zero-based, but the TS service numbering is one-based
     46             Rlog.e(getTag(), "isAvailable for service " + (service + 1) + " fails, max service is " +
     47                     (mServiceTable.length * 8));
     48             return false;
     49         }
     50         int bit = service % 8;
     51         return (mServiceTable[offset] & (1 << bit)) != 0;
     52     }
     53 
     54     @Override
     55     public String toString() {
     56         Object[] values = getValues();
     57         int numBytes = mServiceTable.length;
     58         StringBuilder builder = new StringBuilder(getTag()).append('[')
     59                 .append(numBytes * 8).append("]={ ");
     60 
     61         boolean addComma = false;
     62         for (int i = 0; i < numBytes; i++) {
     63             byte currentByte = mServiceTable[i];
     64             for (int bit = 0; bit < 8; bit++) {
     65                 if ((currentByte & (1 << bit)) != 0) {
     66                     if (addComma) {
     67                         builder.append(", ");
     68                     } else {
     69                         addComma = true;
     70                     }
     71                     int ordinal = (i * 8) + bit;
     72                     if (ordinal < values.length) {
     73                         builder.append(values[ordinal]);
     74                     } else {
     75                         builder.append('#').append(ordinal + 1);    // service number (one-based)
     76                     }
     77                 }
     78             }
     79         }
     80         return builder.append(" }").toString();
     81     }
     82 }
     83