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 17package com.squareup.okhttp.internal.http; 18 19public final class HeaderParser { 20 /** 21 * Returns the next index in {@code input} at or after {@code pos} that 22 * contains a character from {@code characters}. Returns the input length if 23 * none of the requested characters can be found. 24 */ 25 public static int skipUntil(String input, int pos, String characters) { 26 for (; pos < input.length(); pos++) { 27 if (characters.indexOf(input.charAt(pos)) != -1) { 28 break; 29 } 30 } 31 return pos; 32 } 33 34 /** 35 * Returns the next non-whitespace character in {@code input} that is white 36 * space. Result is undefined if input contains newline characters. 37 */ 38 public static int skipWhitespace(String input, int pos) { 39 for (; pos < input.length(); pos++) { 40 char c = input.charAt(pos); 41 if (c != ' ' && c != '\t') { 42 break; 43 } 44 } 45 return pos; 46 } 47 48 /** 49 * Returns {@code value} as a positive integer, or 0 if it is negative, or 50 * {@code defaultValue} if it cannot be parsed. 51 */ 52 public static int parseSeconds(String value, int defaultValue) { 53 try { 54 long seconds = Long.parseLong(value); 55 if (seconds > Integer.MAX_VALUE) { 56 return Integer.MAX_VALUE; 57 } else if (seconds < 0) { 58 return 0; 59 } else { 60 return (int) seconds; 61 } 62 } catch (NumberFormatException e) { 63 return defaultValue; 64 } 65 } 66 67 private HeaderParser() { 68 } 69} 70