| /* |
| * Copyright (C) 2019 The Android Open Source Project |
| * |
| * Licensed 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 com.android.server.protolog.common; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * Represents a type of logged data encoded in the proto. |
| */ |
| public class LogDataType { |
| // When updating this list make sure to update bitmask conversion methods accordingly. |
| // STR type should be the first in the enum in order to be the default type. |
| public static final int STRING = 0b00; |
| public static final int LONG = 0b01; |
| public static final int DOUBLE = 0b10; |
| public static final int BOOLEAN = 0b11; |
| |
| private static final int TYPE_WIDTH = 2; |
| private static final int TYPE_MASK = 0b11; |
| |
| /** |
| * Creates a bitmask representing a list of data types. |
| */ |
| public static int logDataTypesToBitMask(List<Integer> types) { |
| if (types.size() > 16) { |
| throw new BitmaskConversionException("Too many log call parameters " |
| + "- max 16 parameters supported"); |
| } |
| int mask = 0; |
| for (int i = 0; i < types.size(); i++) { |
| int x = types.get(i); |
| mask = mask | (x << (i * TYPE_WIDTH)); |
| } |
| return mask; |
| } |
| |
| /** |
| * Decodes a bitmask to a list of LogDataTypes of provided length. |
| */ |
| public static int bitmaskToLogDataType(int bitmask, int index) { |
| if (index > 16) { |
| throw new BitmaskConversionException("Max 16 parameters allowed"); |
| } |
| return (bitmask >> (index * TYPE_WIDTH)) & TYPE_MASK; |
| } |
| |
| /** |
| * Creates a list of LogDataTypes from a message format string. |
| */ |
| public static List<Integer> parseFormatString(String messageString) { |
| ArrayList<Integer> types = new ArrayList<>(); |
| for (int i = 0; i < messageString.length(); ) { |
| if (messageString.charAt(i) == '%') { |
| if (i + 1 >= messageString.length()) { |
| throw new InvalidFormatStringException("Invalid format string in config"); |
| } |
| switch (messageString.charAt(i + 1)) { |
| case 'b': |
| types.add(LogDataType.BOOLEAN); |
| break; |
| case 'd': |
| case 'o': |
| case 'x': |
| types.add(LogDataType.LONG); |
| break; |
| case 'f': |
| case 'e': |
| case 'g': |
| types.add(LogDataType.DOUBLE); |
| break; |
| case 's': |
| types.add(LogDataType.STRING); |
| break; |
| case '%': |
| break; |
| default: |
| throw new InvalidFormatStringException("Invalid format string field" |
| + " %${messageString[i + 1]}"); |
| } |
| i += 2; |
| } else { |
| i += 1; |
| } |
| } |
| return types; |
| } |
| } |