diff options
Diffstat (limited to 'common/framework/com/android/net/module/util/DnsSdTxtRecord.java')
-rw-r--r-- | common/framework/com/android/net/module/util/DnsSdTxtRecord.java | 325 |
1 files changed, 0 insertions, 325 deletions
diff --git a/common/framework/com/android/net/module/util/DnsSdTxtRecord.java b/common/framework/com/android/net/module/util/DnsSdTxtRecord.java deleted file mode 100644 index 760891b9..00000000 --- a/common/framework/com/android/net/module/util/DnsSdTxtRecord.java +++ /dev/null @@ -1,325 +0,0 @@ -/* -*- Mode: Java; tab-width: 4 -*- - * - * Copyright (c) 2004 Apple Computer, Inc. All rights reserved. - * - * 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. - - To do: - - implement remove() - - fix set() to replace existing values - */ - -package com.android.net.module.util; - -import android.os.Parcelable; -import android.os.Parcel; - -import java.util.Arrays; - -/** - * This class handles TXT record data for DNS based service discovery as specified at - * http://tools.ietf.org/html/draft-cheshire-dnsext-dns-sd-11 - * - * DNS-SD specifies that a TXT record corresponding to an SRV record consist of - * a packed array of bytes, each preceded by a length byte. Each string - * is an attribute-value pair. - * - * The DnsSdTxtRecord object stores the entire TXT data as a single byte array, traversing it - * as need be to implement its various methods. - * @hide - * - */ -public class DnsSdTxtRecord implements Parcelable { - private static final byte mSeparator = '='; - - private byte[] mData; - - /** Constructs a new, empty TXT record. */ - public DnsSdTxtRecord() { - mData = new byte[0]; - } - - /** Constructs a new TXT record from a byte array in the standard format. */ - public DnsSdTxtRecord(byte[] data) { - mData = (byte[]) data.clone(); - } - - /** Copy constructor */ - public DnsSdTxtRecord(DnsSdTxtRecord src) { - if (src != null && src.mData != null) { - mData = (byte[]) src.mData.clone(); - } - } - - /** - * Set a key/value pair. Setting an existing key will replace its value. - * @param key Must be ascii with no '=' - * @param value matching value to key - */ - public void set(String key, String value) { - byte[] keyBytes; - byte[] valBytes; - int valLen; - - if (value != null) { - valBytes = value.getBytes(); - valLen = valBytes.length; - } else { - valBytes = null; - valLen = 0; - } - - try { - keyBytes = key.getBytes("US-ASCII"); - } - catch (java.io.UnsupportedEncodingException e) { - throw new IllegalArgumentException("key should be US-ASCII"); - } - - for (int i = 0; i < keyBytes.length; i++) { - if (keyBytes[i] == '=') { - throw new IllegalArgumentException("= is not a valid character in key"); - } - } - - if (keyBytes.length + valLen >= 255) { - throw new IllegalArgumentException("Key and Value length cannot exceed 255 bytes"); - } - - int currentLoc = remove(key); - if (currentLoc == -1) - currentLoc = keyCount(); - - insert(keyBytes, valBytes, currentLoc); - } - - /** - * Get a value for a key - * - * @param key - * @return The value associated with the key - */ - public String get(String key) { - byte[] val = this.getValue(key); - return val != null ? new String(val) : null; - } - - /** Remove a key/value pair. If found, returns the index or -1 if not found */ - public int remove(String key) { - int avStart = 0; - - for (int i=0; avStart < mData.length; i++) { - int avLen = mData[avStart]; - if (key.length() <= avLen && - (key.length() == avLen || mData[avStart + key.length() + 1] == mSeparator)) { - String s = new String(mData, avStart + 1, key.length()); - if (0 == key.compareToIgnoreCase(s)) { - byte[] oldBytes = mData; - mData = new byte[oldBytes.length - avLen - 1]; - System.arraycopy(oldBytes, 0, mData, 0, avStart); - System.arraycopy(oldBytes, avStart + avLen + 1, mData, avStart, - oldBytes.length - avStart - avLen - 1); - return i; - } - } - avStart += (0xFF & (avLen + 1)); - } - return -1; - } - - /** Return the count of keys */ - public int keyCount() { - int count = 0, nextKey; - for (nextKey = 0; nextKey < mData.length; count++) { - nextKey += (0xFF & (mData[nextKey] + 1)); - } - return count; - } - - /** Return true if key is present, false if not. */ - public boolean contains(String key) { - String s = null; - for (int i = 0; null != (s = this.getKey(i)); i++) { - if (0 == key.compareToIgnoreCase(s)) return true; - } - return false; - } - - /* Gets the size in bytes */ - public int size() { - return mData.length; - } - - /* Gets the raw data in bytes */ - public byte[] getRawData() { - return (byte[]) mData.clone(); - } - - private void insert(byte[] keyBytes, byte[] value, int index) { - byte[] oldBytes = mData; - int valLen = (value != null) ? value.length : 0; - int insertion = 0; - int newLen, avLen; - - for (int i = 0; i < index && insertion < mData.length; i++) { - insertion += (0xFF & (mData[insertion] + 1)); - } - - avLen = keyBytes.length + valLen + (value != null ? 1 : 0); - newLen = avLen + oldBytes.length + 1; - - mData = new byte[newLen]; - System.arraycopy(oldBytes, 0, mData, 0, insertion); - int secondHalfLen = oldBytes.length - insertion; - System.arraycopy(oldBytes, insertion, mData, newLen - secondHalfLen, secondHalfLen); - mData[insertion] = (byte) avLen; - System.arraycopy(keyBytes, 0, mData, insertion + 1, keyBytes.length); - if (value != null) { - mData[insertion + 1 + keyBytes.length] = mSeparator; - System.arraycopy(value, 0, mData, insertion + keyBytes.length + 2, valLen); - } - } - - /** Return a key in the TXT record by zero-based index. Returns null if index exceeds the total number of keys. */ - private String getKey(int index) { - int avStart = 0; - - for (int i=0; i < index && avStart < mData.length; i++) { - avStart += mData[avStart] + 1; - } - - if (avStart < mData.length) { - int avLen = mData[avStart]; - int aLen = 0; - - for (aLen=0; aLen < avLen; aLen++) { - if (mData[avStart + aLen + 1] == mSeparator) break; - } - return new String(mData, avStart + 1, aLen); - } - return null; - } - - /** - * Look up a key in the TXT record by zero-based index and return its value. - * Returns null if index exceeds the total number of keys. - * Returns null if the key is present with no value. - */ - private byte[] getValue(int index) { - int avStart = 0; - byte[] value = null; - - for (int i=0; i < index && avStart < mData.length; i++) { - avStart += mData[avStart] + 1; - } - - if (avStart < mData.length) { - int avLen = mData[avStart]; - int aLen = 0; - - for (aLen=0; aLen < avLen; aLen++) { - if (mData[avStart + aLen + 1] == mSeparator) { - value = new byte[avLen - aLen - 1]; - System.arraycopy(mData, avStart + aLen + 2, value, 0, avLen - aLen - 1); - break; - } - } - } - return value; - } - - private String getValueAsString(int index) { - byte[] value = this.getValue(index); - return value != null ? new String(value) : null; - } - - private byte[] getValue(String forKey) { - String s = null; - int i; - - for (i = 0; null != (s = this.getKey(i)); i++) { - if (0 == forKey.compareToIgnoreCase(s)) { - return this.getValue(i); - } - } - - return null; - } - - /** - * Return a string representation. - * Example : {key1=value1},{key2=value2}.. - * - * For a key say like "key3" with null value - * {key1=value1},{key2=value2}{key3} - */ - public String toString() { - String a, result = null; - - for (int i = 0; null != (a = this.getKey(i)); i++) { - String av = "{" + a; - String val = this.getValueAsString(i); - if (val != null) - av += "=" + val + "}"; - else - av += "}"; - if (result == null) - result = av; - else - result = result + ", " + av; - } - return result != null ? result : ""; - } - - @Override - public boolean equals(Object o) { - if (o == this) { - return true; - } - if (!(o instanceof DnsSdTxtRecord)) { - return false; - } - - DnsSdTxtRecord record = (DnsSdTxtRecord)o; - return Arrays.equals(record.mData, mData); - } - - @Override - public int hashCode() { - return Arrays.hashCode(mData); - } - - /** Implement the Parcelable interface */ - public int describeContents() { - return 0; - } - - /** Implement the Parcelable interface */ - public void writeToParcel(Parcel dest, int flags) { - dest.writeByteArray(mData); - } - - /** Implement the Parcelable interface */ - public static final @android.annotation.NonNull Creator<DnsSdTxtRecord> CREATOR = - new Creator<DnsSdTxtRecord>() { - public DnsSdTxtRecord createFromParcel(Parcel in) { - DnsSdTxtRecord info = new DnsSdTxtRecord(); - in.readByteArray(info.mData); - return info; - } - - public DnsSdTxtRecord[] newArray(int size) { - return new DnsSdTxtRecord[size]; - } - }; -} |