1 /* 2 * Copyright (C) 2008 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 android.net.http; 18 19 import org.apache.http.util.CharArrayBuffer; 20 import org.apache.http.protocol.HTTP; 21 22 /** 23 * Utility methods for working on CharArrayBuffers. 24 * 25 * {@hide} 26 */ 27 class CharArrayBuffers { 28 29 static final char uppercaseAddon = 'a' - 'A'; 30 31 /** 32 * Returns true if the buffer contains the given string. Ignores leading 33 * whitespace and case. 34 * 35 * @param buffer to search 36 * @param beginIndex index at which we should start 37 * @param str to search for 38 */ containsIgnoreCaseTrimmed(CharArrayBuffer buffer, int beginIndex, final String str)39 static boolean containsIgnoreCaseTrimmed(CharArrayBuffer buffer, 40 int beginIndex, final String str) { 41 int len = buffer.length(); 42 char[] chars = buffer.buffer(); 43 while (beginIndex < len && HTTP.isWhitespace(chars[beginIndex])) { 44 beginIndex++; 45 } 46 int size = str.length(); 47 boolean ok = len >= beginIndex + size; 48 for (int j=0; ok && (j<size); j++) { 49 char a = chars[beginIndex+j]; 50 char b = str.charAt(j); 51 if (a != b) { 52 a = toLower(a); 53 b = toLower(b); 54 ok = a == b; 55 } 56 } 57 return ok; 58 } 59 60 /** 61 * Returns index of first occurence ch. Lower cases characters leading up 62 * to first occurrence of ch. 63 */ setLowercaseIndexOf(CharArrayBuffer buffer, final int ch)64 static int setLowercaseIndexOf(CharArrayBuffer buffer, final int ch) { 65 66 int beginIndex = 0; 67 int endIndex = buffer.length(); 68 char[] chars = buffer.buffer(); 69 70 for (int i = beginIndex; i < endIndex; i++) { 71 char current = chars[i]; 72 if (current == ch) { 73 return i; 74 } else if (current >= 'A' && current <= 'Z'){ 75 // make lower case 76 current += uppercaseAddon; 77 chars[i] = current; 78 } 79 } 80 return -1; 81 } 82 toLower(char c)83 private static char toLower(char c) { 84 if (c >= 'A' && c <= 'Z'){ 85 c += uppercaseAddon; 86 } 87 return c; 88 } 89 } 90