zhangshuxiao f51097c743 When wifi ssid is empty, return WifiSsid.NONE
Issue 199610

When WifistateMachine enter Roaming State, WifiInfo
getSSID will return 0x, statusbar show "0x", because
roaming State do not update WifiInfo mWifiSsid.

Cherry pick from I241f8e9c11dc16db26cadde133043745f2f19573

BUG=27403109
TEST=compile and unittests
Signed-off-by: zhangshuxiao <zhangshuxiao@xiaomi.com>

Change-Id: Ieb7429511898a5ed3d44fd15fc1f250c122e802a
2016-03-29 16:35:47 -07:00

239 lines
8.1 KiB
Java

/*
* Copyright (C) 2012 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 android.net.wifi;
import android.os.Parcel;
import android.os.Parcelable;
import java.io.ByteArrayOutputStream;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CoderResult;
import java.nio.charset.CodingErrorAction;
import java.util.Locale;
/**
* Stores SSID octets and handles conversion.
*
* For Ascii encoded string, any octet < 32 or > 127 is encoded as
* a "\x" followed by the hex representation of the octet.
* Exception chars are ", \, \e, \n, \r, \t which are escaped by a \
* See src/utils/common.c for the implementation in the supplicant.
*
* @hide
*/
public class WifiSsid implements Parcelable {
private static final String TAG = "WifiSsid";
public final ByteArrayOutputStream octets = new ByteArrayOutputStream(32);
private static final int HEX_RADIX = 16;
public static final String NONE = "<unknown ssid>";
private WifiSsid() {
}
public static WifiSsid createFromAsciiEncoded(String asciiEncoded) {
WifiSsid a = new WifiSsid();
a.convertToBytes(asciiEncoded);
return a;
}
public static WifiSsid createFromHex(String hexStr) {
WifiSsid a = new WifiSsid();
if (hexStr == null) return a;
if (hexStr.startsWith("0x") || hexStr.startsWith("0X")) {
hexStr = hexStr.substring(2);
}
for (int i = 0; i < hexStr.length()-1; i += 2) {
int val;
try {
val = Integer.parseInt(hexStr.substring(i, i + 2), HEX_RADIX);
} catch(NumberFormatException e) {
val = 0;
}
a.octets.write(val);
}
return a;
}
/* This function is equivalent to printf_decode() at src/utils/common.c in
* the supplicant */
private void convertToBytes(String asciiEncoded) {
int i = 0;
int val = 0;
while (i< asciiEncoded.length()) {
char c = asciiEncoded.charAt(i);
switch (c) {
case '\\':
i++;
switch(asciiEncoded.charAt(i)) {
case '\\':
octets.write('\\');
i++;
break;
case '"':
octets.write('"');
i++;
break;
case 'n':
octets.write('\n');
i++;
break;
case 'r':
octets.write('\r');
i++;
break;
case 't':
octets.write('\t');
i++;
break;
case 'e':
octets.write(27); //escape char
i++;
break;
case 'x':
i++;
try {
val = Integer.parseInt(asciiEncoded.substring(i, i + 2), HEX_RADIX);
} catch (NumberFormatException e) {
val = -1;
}
if (val < 0) {
val = Character.digit(asciiEncoded.charAt(i), HEX_RADIX);
if (val < 0) break;
octets.write(val);
i++;
} else {
octets.write(val);
i += 2;
}
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
val = asciiEncoded.charAt(i) - '0';
i++;
if (asciiEncoded.charAt(i) >= '0' && asciiEncoded.charAt(i) <= '7') {
val = val * 8 + asciiEncoded.charAt(i) - '0';
i++;
}
if (asciiEncoded.charAt(i) >= '0' && asciiEncoded.charAt(i) <= '7') {
val = val * 8 + asciiEncoded.charAt(i) - '0';
i++;
}
octets.write(val);
break;
default:
break;
}
break;
default:
octets.write(c);
i++;
break;
}
}
}
@Override
public String toString() {
byte[] ssidBytes = octets.toByteArray();
// Supplicant returns \x00\x00\x00\x00\x00\x00\x00\x00 hex string
// for a hidden access point. Make sure we maintain the previous
// behavior of returning empty string for this case.
if (octets.size() <= 0 || isArrayAllZeroes(ssidBytes)) return "";
// TODO: Handle conversion to other charsets upon failure
Charset charset = Charset.forName("UTF-8");
CharsetDecoder decoder = charset.newDecoder()
.onMalformedInput(CodingErrorAction.REPLACE)
.onUnmappableCharacter(CodingErrorAction.REPLACE);
CharBuffer out = CharBuffer.allocate(32);
CoderResult result = decoder.decode(ByteBuffer.wrap(ssidBytes), out, true);
out.flip();
if (result.isError()) {
return NONE;
}
return out.toString();
}
private boolean isArrayAllZeroes(byte[] ssidBytes) {
for (int i = 0; i< ssidBytes.length; i++) {
if (ssidBytes[i] != 0) return false;
}
return true;
}
/** @hide */
public boolean isHidden() {
return isArrayAllZeroes(octets.toByteArray());
}
/** @hide */
public byte[] getOctets() {
return octets.toByteArray();
}
/** @hide */
public String getHexString() {
String out = "0x";
byte[] ssidbytes = getOctets();
for (int i = 0; i < octets.size(); i++) {
out += String.format(Locale.US, "%02x", ssidbytes[i]);
}
return (octets.size() > 0) ? out : null;
}
/** Implement the Parcelable interface {@hide} */
public int describeContents() {
return 0;
}
/** Implement the Parcelable interface {@hide} */
public void writeToParcel(Parcel dest, int flags) {
dest.writeInt(octets.size());
dest.writeByteArray(octets.toByteArray());
}
/** Implement the Parcelable interface {@hide} */
public static final Creator<WifiSsid> CREATOR =
new Creator<WifiSsid>() {
public WifiSsid createFromParcel(Parcel in) {
WifiSsid ssid = new WifiSsid();
int length = in.readInt();
byte b[] = new byte[length];
in.readByteArray(b);
ssid.octets.write(b, 0, length);
return ssid;
}
public WifiSsid[] newArray(int size) {
return new WifiSsid[size];
}
};
}