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/**
* Oshi (https://github.com/dblock/oshi)
*
* Copyright (c) 2010 - 2016 The Oshi Project Team
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Maintainers:
* dblock[at]dblock[dot]org
* widdis[at]gmail[dot]com
* enrico.bianchi[at]gmail[dot]com
*
* Contributors:
* https://github.com/dblock/oshi/graphs/contributors
*/
package oshi.util;
import java.io.StringWriter;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.json.Json;
import javax.json.JsonObject;
import javax.json.JsonWriter;
import javax.json.JsonWriterFactory;
import javax.json.stream.JsonGenerator;
import javax.xml.bind.DatatypeConverter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.threeten.bp.LocalTime;
import org.threeten.bp.OffsetDateTime;
import org.threeten.bp.format.DateTimeFormatter;
import org.threeten.bp.format.DateTimeParseException;
/**
* String parsing utility.
*
* @author alessio.fachechi[at]gmail[dot]com
*/
public abstract class ParseUtil {
private static final Logger LOG = LoggerFactory.getLogger(ParseUtil.class);
/**
* Hertz related variables.
*/
final private static String Hertz = "Hz";
final private static String kiloHertz = "k" + Hertz;
final private static String megaHertz = "M" + Hertz;
final private static String gigaHertz = "G" + Hertz;
final private static String teraHertz = "T" + Hertz;
final private static String petaHertz = "P" + Hertz;
final private static Map multipliers;
static {
multipliers = new HashMap<>();
multipliers.put(Hertz, 1L);
multipliers.put(kiloHertz, 1000L);
multipliers.put(megaHertz, 1000000L);
multipliers.put(gigaHertz, 1000000000L);
multipliers.put(teraHertz, 1000000000000L);
multipliers.put(petaHertz, 1000000000000000L);
}
/**
* Used for matching
*/
final private static Pattern HERTZ = Pattern.compile("(\\d+(.\\d+)?) ?([kMGT]?Hz)");
/**
* Used to check validity of a hexadecimal string
*/
final private static Pattern VALID_HEX = Pattern.compile("[0-9a-fA-F]+");
/**
* Parse hertz from a string, eg. "2.00MHz" in 2000000L.
*
* @param hertz
* Hertz size.
* @return {@link Long} Hertz value or -1 if not parsable.
*/
public static long parseHertz(String hertz) {
Matcher matcher = HERTZ.matcher(hertz.trim());
if (matcher.find() && matcher.groupCount() == 3) {
try {
Double value = Double.valueOf(matcher.group(1));
String unit = matcher.group(3);
if (multipliers.containsKey(unit)) {
value = value * multipliers.get(unit);
return value.longValue();
}
} catch (NumberFormatException e) {
LOG.trace("", e);
}
}
return -1L;
}
/**
* Parse the last element of a string to a value
*
* @param s
* The string to parse
* @param i
* Default integer if not parsable
* @return {@link Integer} value or the given default if not parsable
*/
public static int parseLastInt(String s, int i) {
String[] ss = s.split("\\s+");
if (ss.length < 2) {
return i;
} else {
try {
return Integer.parseInt(ss[ss.length - 1]);
} catch (NumberFormatException nfe) {
return i;
}
}
}
/**
* Parse a string of hexadecimal digits into a byte array
*
* @param digits
* The string to be parsed
* @return a byte array with each pair of characters converted to a byte
*/
public static byte[] hexStringToByteArray(String digits) {
// Check if string is valid hex
if (!VALID_HEX.matcher(digits).matches()) {
LOG.error("Invalid hexadecimal string: {}", digits);
return null;
}
int len = digits.length();
byte[] data = new byte[len / 2];
for (int i = 0; i < len; i += 2) {
data[i / 2] = (byte) ((Character.digit(digits.charAt(i), 16) << 4)
| Character.digit(digits.charAt(i + 1), 16));
}
return data;
}
/**
* Parse a human readable string into a byte array, truncating or padding
* with zeros (if necessary) so the array has the specified length.
*
* @param text
* The string to be parsed
* @param length
* Length of the returned array.
* @return A byte array of specified length, with each of the first length
* characters converted to a byte. If length is longer than the
* provided string length, will be filled with zeroes.
*/
public static byte[] stringToByteArray(String text, int length) {
return Arrays.copyOf(text.getBytes(), length);
}
/**
* Convert a long value to a byte array using Big Endian, truncating or
* padding with zeros (if necessary) so the array has the specified length.
*
* @param value
* The value to be converted
* @param valueSize
* Number of bytes representing the value
* @param length
* Number of bytes to return
* @return A byte array of specified length representing the long in the
* first valueSize bytes
*/
public static byte[] longToByteArray(long value, int valueSize, int length) {
// Convert the long to 8-byte BE representation
byte[] b = new byte[8];
for (int i = 7; i >= 0 && value != 0L; i--) {
b[i] = (byte) value;
value >>>= 8;
}
// Then copy the rightmost valueSize bytes
// e.g., for an integer we want rightmost 4 bytes
return Arrays.copyOfRange(b, 8 - valueSize, 8 + length - valueSize);
}
/**
* Convert a string to an integer representation.
*
* @param str
* A human readable string
* @param size
* Number of characters to convert to the long. May not exceed 8.
* @return An integer representing the string where each character is
* treated as a byte
*/
public static long strToLong(String str, int size) {
return byteArrayToLong(str.getBytes(), size);
}
/**
* Convert a byte array to its integer representation.
*
* @param bytes
* An array of bytes no smaller than the size to be converted
* @param size
* Number of bytes to convert to the long. May not exceed 8.
* @return An integer representing the byte array as a 64-bit number
*/
public static long byteArrayToLong(byte[] bytes, int size) {
if (size > 8) {
throw new IllegalArgumentException("Can't convert more than 8 bytes.");
}
if (size > bytes.length) {
throw new IllegalArgumentException("Size can't be larger than array length.");
}
long total = 0L;
for (int i = 0; i < size; i++) {
total = (total << 8) | (bytes[i] & 0xff);
}
return total;
}
/**
* Convert a byte array to its floating point representation.
*
* @param bytes
* An array of bytes no smaller than the size to be converted
* @param size
* Number of bytes to convert to the float. May not exceed 8.
* @param fpBits
* Number of bits representing the decimal
* @return A float; the integer portion representing the byte array as an
* integer shifted by the bits specified in fpBits; with the
* remaining bits used as a decimal
*/
public static float byteArrayToFloat(byte[] bytes, int size, int fpBits) {
return byteArrayToLong(bytes, size) / (float) (1 << fpBits);
}
/**
* Pretty print a JSON string.
*
* @param json
* A JSON object
* @return String representing the object with added whitespace, new lines,
* indentation
*/
public static String jsonPrettyPrint(JsonObject json) {
// Pretty printing using JsonWriterFactory
// Output stream
StringWriter stringWriter = new StringWriter();
// Config
Map config = new HashMap();
config.put(JsonGenerator.PRETTY_PRINTING, true);
JsonWriterFactory writerFactory = Json.createWriterFactory(config);
// Writer
JsonWriter jsonWriter = writerFactory.createWriter(stringWriter);
jsonWriter.write(json);
jsonWriter.close();
// Return
return stringWriter.toString();
}
/*
* Format for parsing DATETIME originally 20160513072950.782000-420,
* modified to 20160513072950.782000-07:00
*/
private static DateTimeFormatter CIM_FORMAT = DateTimeFormatter.ofPattern("yyyyMMddHHmmss.SSSSSSZZZZZ", Locale.US);
/**
* Parses a CIM_DateTime format (from WMI) to milliseconds since the epoch.
* See https://msdn.microsoft.com/en-us/library/aa387237(v=vs.85).aspx
*
* @param cimDate
* A string containing the CIM_DateTime
* @return The corresponding DateTime as a number of milliseconds since the
* epoch
*/
public static long cimDateTimeToMillis(String cimDate) {
// Keep first 22 characters: digits, decimal, and + or - sign of
// time zone. Parse last 3 digits from minutes to HH:mm
try {
int tzInMinutes = Integer.parseInt(cimDate.substring(22));
LocalTime offsetAsLocalTime = LocalTime.MIN.plusMinutes(tzInMinutes);
OffsetDateTime dateTime = OffsetDateTime.parse(
cimDate.substring(0, 22) + offsetAsLocalTime.format(DateTimeFormatter.ISO_LOCAL_TIME), CIM_FORMAT);
return dateTime.toInstant().toEpochMilli();
} catch (IndexOutOfBoundsException // if cimDate not 22+ chars
| NumberFormatException // if TZ minutes doesn't parse
| DateTimeParseException e) {
return 0L;
}
}
/**
* Parses a string of hex digits to a string
*
* @param hexString
* A sequence of hex digits
* @return The corresponding string if valid hex; otherwise the original
* hexString
*/
public static String hexStringToString(String hexString) {
try {
return new String(DatatypeConverter.parseHexBinary(hexString));
} catch (IllegalArgumentException e) {
// Hex failed to parse, just return the existing string
return hexString;
}
}
}
