1package com.android.server.wifi.hotspot2;
2
3import com.android.server.wifi.hotspot2.anqp.Constants;
4
5import java.nio.ByteBuffer;
6import java.util.ArrayList;
7import java.util.Calendar;
8import java.util.Collection;
9import java.util.LinkedList;
10import java.util.List;
11import java.util.TimeZone;
12
13import static com.android.server.wifi.hotspot2.anqp.Constants.BYTE_MASK;
14import static com.android.server.wifi.hotspot2.anqp.Constants.NIBBLE_MASK;
15
16public abstract class Utils {
17
18    public static final long UNSET_TIME = -1;
19
20    private static final int EUI48Length = 6;
21    private static final int EUI64Length = 8;
22    private static final long EUI48Mask = 0xffffffffffffL;
23    private static final String[] PLMNText = {"org", "3gppnetwork", "mcc*", "mnc*", "wlan" };
24
25    public static String hs2LogTag(Class c) {
26        return "HS20";
27    }
28
29    public static List<String> splitDomain(String domain) {
30
31        if (domain.endsWith("."))
32            domain = domain.substring(0, domain.length() - 1);
33        int at = domain.indexOf('@');
34        if (at >= 0)
35            domain = domain.substring(at + 1);
36
37        String[] labels = domain.toLowerCase().split("\\.");
38        LinkedList<String> labelList = new LinkedList<String>();
39        for (String label : labels) {
40            labelList.addFirst(label);
41        }
42
43        return labelList;
44    }
45
46    public static long parseMac(String s) {
47
48        long mac = 0;
49        int count = 0;
50        for (int n = 0; n < s.length(); n++) {
51            int nibble = Utils.fromHex(s.charAt(n), true);  // Set lenient to not blow up on ':'
52            if (nibble >= 0) {                              // ... and use only legit hex.
53                mac = (mac << 4) | nibble;
54                count++;
55            }
56        }
57        if (count < 12 || (count&1) == 1) {
58            throw new IllegalArgumentException("Bad MAC address: '" + s + "'");
59        }
60        return mac;
61    }
62
63    public static String macToString(long mac) {
64        int len = (mac & ~EUI48Mask) != 0 ? EUI64Length : EUI48Length;
65        StringBuilder sb = new StringBuilder();
66        boolean first = true;
67        for (int n = (len - 1)*Byte.SIZE; n >= 0; n -= Byte.SIZE) {
68            if (first) {
69                first = false;
70            }
71            else {
72                sb.append(':');
73            }
74            sb.append(String.format("%02x", (mac >>> n) & Constants.BYTE_MASK));
75        }
76        return sb.toString();
77    }
78
79    public static String getMccMnc(List<String> domain) {
80        if (domain.size() != PLMNText.length) {
81            return null;
82        }
83
84        for (int n = 0; n < PLMNText.length; n++ ) {
85            String expect = PLMNText[n];
86            int len = expect.endsWith("*") ? expect.length() - 1 : expect.length();
87            if (!domain.get(n).regionMatches(0, expect, 0, len)) {
88                return null;
89            }
90        }
91
92        String prefix = domain.get(2).substring(3) + domain.get(3).substring(3);
93        for (int n = 0; n < prefix.length(); n++) {
94            char ch = prefix.charAt(n);
95            if (ch < '0' || ch > '9') {
96                return null;
97            }
98        }
99        return prefix;
100    }
101
102    public static String roamingConsortiumsToString(long[] ois) {
103        if (ois == null) {
104            return "null";
105        }
106        List<Long> list = new ArrayList<Long>(ois.length);
107        for (long oi : ois) {
108            list.add(oi);
109        }
110        return roamingConsortiumsToString(list);
111    }
112
113    public static String roamingConsortiumsToString(Collection<Long> ois) {
114        StringBuilder sb = new StringBuilder();
115        boolean first = true;
116        for (long oi : ois) {
117            if (first) {
118                first = false;
119            } else {
120                sb.append(", ");
121            }
122            if (Long.numberOfLeadingZeros(oi) > 40) {
123                sb.append(String.format("%06x", oi));
124            } else {
125                sb.append(String.format("%010x", oi));
126            }
127        }
128        return sb.toString();
129    }
130
131    public static String toUnicodeEscapedString(String s) {
132        StringBuilder sb = new StringBuilder(s.length());
133        for (int n = 0; n < s.length(); n++) {
134            char ch = s.charAt(n);
135            if (ch>= ' ' && ch < 127) {
136                sb.append(ch);
137            }
138            else {
139                sb.append("\\u").append(String.format("%04x", (int)ch));
140            }
141        }
142        return sb.toString();
143    }
144
145    public static String toHexString(byte[] data) {
146        if (data == null) {
147            return "null";
148        }
149        StringBuilder sb = new StringBuilder(data.length * 3);
150
151        boolean first = true;
152        for (byte b : data) {
153            if (first) {
154                first = false;
155            } else {
156                sb.append(' ');
157            }
158            sb.append(String.format("%02x", b & BYTE_MASK));
159        }
160        return sb.toString();
161    }
162
163    public static String toHex(byte[] octets) {
164        StringBuilder sb = new StringBuilder(octets.length * 2);
165        for (byte o : octets) {
166            sb.append(String.format("%02x", o & BYTE_MASK));
167        }
168        return sb.toString();
169    }
170
171    public static byte[] hexToBytes(String text) {
172        if ((text.length() & 1) == 1) {
173            throw new NumberFormatException("Odd length hex string: " + text.length());
174        }
175        byte[] data = new byte[text.length() >> 1];
176        int position = 0;
177        for (int n = 0; n < text.length(); n += 2) {
178            data[position] =
179                    (byte) (((fromHex(text.charAt(n), false) & NIBBLE_MASK) << 4) |
180                            (fromHex(text.charAt(n + 1), false) & NIBBLE_MASK));
181            position++;
182        }
183        return data;
184    }
185
186    public static int fromHex(char ch, boolean lenient) throws NumberFormatException {
187        if (ch <= '9' && ch >= '0') {
188            return ch - '0';
189        } else if (ch >= 'a' && ch <= 'f') {
190            return ch + 10 - 'a';
191        } else if (ch <= 'F' && ch >= 'A') {
192            return ch + 10 - 'A';
193        } else if (lenient) {
194            return -1;
195        } else {
196            throw new NumberFormatException("Bad hex-character: " + ch);
197        }
198    }
199
200    private static char toAscii(int b) {
201        return b >= ' ' && b < 0x7f ? (char) b : '.';
202    }
203
204    static boolean isDecimal(String s) {
205        for (int n = 0; n < s.length(); n++) {
206            char ch = s.charAt(n);
207            if (ch < '0' || ch > '9') {
208                return false;
209            }
210        }
211        return true;
212    }
213
214    public static <T extends Comparable> int compare(Comparable<T> c1, T c2) {
215        if (c1 == null) {
216            return c2 == null ? 0 : -1;
217        }
218        else if (c2 == null) {
219            return 1;
220        }
221        else {
222            return c1.compareTo(c2);
223        }
224    }
225
226    public static String bytesToBingoCard(ByteBuffer data, int len) {
227        ByteBuffer dup = data.duplicate();
228        dup.limit(dup.position() + len);
229        return bytesToBingoCard(dup);
230    }
231
232    public static String bytesToBingoCard(ByteBuffer data) {
233        ByteBuffer dup = data.duplicate();
234        StringBuilder sbx = new StringBuilder();
235        while (dup.hasRemaining()) {
236            sbx.append(String.format("%02x ", dup.get() & BYTE_MASK));
237        }
238        dup = data.duplicate();
239        sbx.append(' ');
240        while (dup.hasRemaining()) {
241            sbx.append(String.format("%c", toAscii(dup.get() & BYTE_MASK)));
242        }
243        return sbx.toString();
244    }
245
246    public static String toHMS(long millis) {
247        long time = millis >= 0 ? millis : -millis;
248        long tmp = time / 1000L;
249        long ms = time - tmp * 1000L;
250
251        time = tmp;
252        tmp /= 60L;
253        long s = time - tmp * 60L;
254
255        time = tmp;
256        tmp /= 60L;
257        long m = time - tmp * 60L;
258
259        return String.format("%s%d:%02d:%02d.%03d", millis < 0 ? "-" : "", tmp, m, s, ms);
260    }
261
262    public static String toUTCString(long ms) {
263        if (ms < 0) {
264            return "unset";
265        }
266        Calendar c = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
267        c.setTimeInMillis(ms);
268        return String.format("%4d/%02d/%02d %2d:%02d:%02dZ",
269                c.get(Calendar.YEAR),
270                c.get(Calendar.MONTH) + 1,
271                c.get(Calendar.DAY_OF_MONTH),
272                c.get(Calendar.HOUR_OF_DAY),
273                c.get(Calendar.MINUTE),
274                c.get(Calendar.SECOND));
275    }
276
277    public static String unquote(String s) {
278        if (s == null) {
279            return null;
280        }
281        else if (s.length() > 1 && s.startsWith("\"") && s.endsWith("\"")) {
282            return s.substring(1, s.length()-1);
283        }
284        else {
285            return s;
286        }
287    }
288}
289