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## net.i2p.data
Class DataHelper

    java.lang.Object
      net.i2p.data.DataHelper

    public class DataHelper

extends Object

Defines some simple IO routines for dealing with marshalling data structures

Author:
  jrandom

Field Summary
`static byte` | `BOOLEAN_FALSE` deprecated - used only in DatabaseLookupMessage
`static int` | `BOOLEAN_LENGTH` Deprecated. unused
`static byte` | `BOOLEAN_TRUE` deprecated - used only in DatabaseLookupMessage
`static byte` | `BOOLEAN_UNKNOWN` Deprecated. unused
`static int` | `DATE_LENGTH`
`static int` | `MAX_COMPRESSION`
`static int` | `NO_COMPRESSION`

Constructor Summary
`DataHelper()`

Method Summary
`static int` | `compareTo(byte[] lhs, byte[] rhs)` treat bytes as unsigned
`static byte[]` | `compress(byte[] orig)` compress the data and return a new GZIP compressed array
`static byte[]` | `compress(byte[] orig, int offset, int size)`
`static byte[]` | `compress(byte[] orig, int offset, int size, int level)`
`static byte[]` | `decompress(byte[] orig)` decompress the GZIP compressed data (returning null on error)
`static byte[]` | `decompress(byte[] orig, int offset, int length)`
`static boolean` | `eq(byte[] lhs, byte[] rhs)` Run a comparison on the byte arrays, byte by byte.
`static boolean` | `eq(byte[] lhs, int offsetLeft, byte[] rhs, int offsetRight, int length)` Unlike eq(byte[], byte[]), this returns false if both lhs and rhs are null.
`static boolean` | `eq(byte lhs, byte rhs)` Deprecated. inefficient
`static boolean` | `eq(Collection lhs, Collection rhs)` Run a deep comparison across the two collections.
`static boolean` | `eq(int lhs, int rhs)` Deprecated. inefficient
`static boolean` | `eq(long lhs, long rhs)` Deprecated. inefficient
`static boolean` | `eq(Object lhs, Object rhs)` Helper util to compare two objects, including null handling.
`static String` | `formatDuration(long ms)` NOTE: formatDuration2() recommended in most cases for readability
`static String` | `formatDuration2(long ms)` Like formatDuration but with a non-breaking space after the number, 0 is unitless, and the unit is translated.
`static String` | `formatSize(long bytes)` Caller should append 'B' or 'b' as appropriate NOTE: formatDuration2() recommended in most cases for readability
`static String` | `formatSize2(long bytes)` Like formatSize but with a non-breaking space after the number This seems consistent with most style guides out there.
`static Boolean` | `fromBoolean(byte[] data, int offset)` Deprecated. unused
`static Date` | `fromDate(byte[] src, int offset)`
`static byte[]` | `fromHexString(String val)`
`static long` | `fromLong(byte[] src, int offset, int numBytes)`
`static int` | `fromProperties(byte[] source, int offset, Properties target)` Reads the props from the byte array and puts them in the Properties target See readProperties() for the format.
`static String` | `getUTF8(byte[] orig)` Deprecated. unused
`static String` | `getUTF8(byte[] orig, int offset, int len)` Deprecated. unused
`static byte[]` | `getUTF8(String orig)` Same as orig.getBytes("UTF-8") but throws an unchecked RuntimeException instead of an UnsupportedEncodingException if no UTF-8, for ease of use.
`static byte[]` | `getUTF8(StringBuffer orig)` Deprecated. unused
`static int` | `hashCode(byte[] b)` Calculate the hashcode of the byte array, using 0 for null
`static int` | `hashCode(Collection col)` Calculate the hashcode of the collection, using 0 for null
`static int` | `hashCode(Date obj)` Calculate the hashcode of the date, using 0 for null
`static int` | `hashCode(Object obj)` Calculate the hashcode of the object, using 0 for null
`static void` | `loadProps(Properties props, File file)` A more efficient Properties.load Some of the other differences: - This does not process or drop backslashes - '#' or ';' starts a comment line, but '!' does not - Leading whitespace is not trimmed - '=' is the only key-termination character (not ':' or whitespace) Note that the escaping of \r or \n was probably a mistake and should be taken out.
`static void` | `loadProps(Properties props, File file, boolean forceLowerCase)`
`static void` | `loadProps(Properties props, InputStream inStr)`
`static void` | `loadProps(Properties props, InputStream inStr, boolean forceLowerCase)`
`static int` | `read(InputStream in, byte[] target)` This is different than InputStream.read(target), in that it does repeated reads until the full data is received.
`static int` | `read(InputStream in, byte[] target, int offset, int length)` This is different than InputStream.read(target, offset, length), in that it returns the new offset (== old offset + bytes read).
`static Boolean` | `readBoolean(InputStream in)` Deprecated. unused
`static Date` | `readDate(InputStream in)` Read in a date from the stream as specified by the I2P data structure spec.
`static String` | `readLine(InputStream in)` Read a newline delimited line from the stream, returning the line (without the newline), or null if EOF reached before the newline was found Warning - strips \n but not \r Warning - 8KB line length limit as of 0.7.13, @throws IOException if exceeded Warning - not UTF-8
`static String` | `readLine(InputStream in, Sha256Standalone hash)` update the hash along the way Warning - strips \n but not \r Warning - 8KB line length limit as of 0.7.13, @throws IOException if exceeded Warning - not UTF-8
`static boolean` | `readLine(InputStream in, StringBuffer buf)` Deprecated. use StringBuilder version
`static boolean` | `readLine(InputStream in, StringBuffer buf, Sha256Standalone hash)` Deprecated. use StringBuilder version
`static boolean` | `readLine(InputStream in, StringBuilder buf)` Read in a line, placing it into the buffer (excluding the newline).
`static boolean` | `readLine(InputStream in, StringBuilder buf, Sha256Standalone hash)` update the hash along the way Warning - strips \n but not \r Warning - 8KB line length limit as of 0.7.13, @throws IOException if exceeded Warning - not UTF-8
`static long` | `readLong(InputStream rawStream, int numBytes)` Read the stream for an integer as defined by the I2P data structure specification.
`static Properties` | `readProperties(InputStream rawStream)` Read a mapping from the stream, as defined by the I2P data structure spec, and store it into a Properties object.
`static String` | `readString(InputStream in)` Read in a string from the stream as specified by the I2P data structure spec.
`static List<? extends DataStructure>` | `sortStructures(Collection<? extends DataStructure> dataStructures)` Sort based on the Hash of the DataStructure.
`static void` | `storeProps(Properties props, File file)` Writes the props to the file, unsorted (unless props is an OrderedProperties) Note that this does not escape the \r or \n that are unescaped in loadProps() above.
`static String` | `stripHTML(String orig)` Strip out any HTML (simply removing any less than / greater than symbols)
`static void` | `toBoolean(byte[] data, int offset, boolean value)` Deprecated. unused
`static void` | `toBoolean(byte[] data, int offset, Boolean value)` Deprecated. unused
`static void` | `toDate(byte[] target, int offset, long when)`
`static byte[]` | `toDate(Date date)` Deprecated. unused
`static String` | `toDecimalString(byte[] buf, int len)`
`static String` | `toHexString(byte[] data)`
`static void` | `toLong(byte[] target, int offset, int numBytes, long value)`
`static byte[]` | `toLong(int numBytes, long value)`
`static int` | `toProperties(byte[] target, int offset, Properties props)` Deprecated.
`static byte[]` | `toProperties(Properties opts)` Writes the props to returned byte array, not sorted (unless the opts param is an OrderedProperties) Strings will be UTF-8 encoded in the byte array.
`static String` | `toString(byte[] buf)`
`static String` | `toString(byte[] buf, int len)`
`static String` | `toString(Collection col)` Pretty print the collection
`static String` | `toString(Properties options)` Pretty print the mapping, unsorted (unless the options param is an OrderedProperties)
`static void` | `write(OutputStream out, byte[] data, Sha256Standalone hash)`
`static void` | `writeBoolean(OutputStream out, Boolean bool)` Deprecated. unused
`static void` | `writeDate(OutputStream out, Date date)` Write out a date to the stream as specified by the I2P data structure spec.
`static void` | `writeLong(OutputStream rawStream, int numBytes, long value)` Write an integer as defined by the I2P data structure specification to the stream.
`static void` | `writeProperties(OutputStream rawStream, Properties props)` Write a mapping to the stream, as defined by the I2P data structure spec, and store it into a Properties object.
`static void` | `writeProperties(OutputStream rawStream, Properties props, boolean utf8)` Writes the props to the stream, sorted by property name.
`static void` | `writeProperties(OutputStream rawStream, Properties props, boolean utf8, boolean sort)` Writes the props to the stream, sorted by property name if sort == true or if props is an OrderedProperties.
`static void` | `writeString(OutputStream out, String string)` Write out a string to the stream as specified by the I2P data structure spec.
`static byte[]` | `xor(byte[] lhs, byte[] rhs)`
`static void` | `xor(byte[] lhs, int startLeft, byte[] rhs, int startRight, byte[] out, int startOut, int len)` xor the lhs with the rhs, storing the result in out.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### DATE_LENGTH

    public static final int DATE_LENGTH

See Also:
  Constant Field Values

### BOOLEAN_TRUE

    public static final byte BOOLEAN_TRUE

  deprecated - used only in DatabaseLookupMessage

  See Also:
    Constant Field Values

### BOOLEAN_FALSE

    public static final byte BOOLEAN_FALSE

  deprecated - used only in DatabaseLookupMessage

  See Also:
    Constant Field Values

### BOOLEAN_UNKNOWN

    @Deprecated
    public static final byte BOOLEAN_UNKNOWN

  Deprecated. unused
  See Also:
    Constant Field Values

### BOOLEAN_LENGTH

    @Deprecated
    public static final int BOOLEAN_LENGTH

  Deprecated. unused
  See Also:
    Constant Field Values

### MAX_COMPRESSION

    public static final int MAX_COMPRESSION

See Also:
  Constant Field Values

### NO_COMPRESSION

    public static final int NO_COMPRESSION

See Also:
  Constant Field Values

Constructor Detail

### DataHelper

    public DataHelper()

Method Detail

### readProperties

    public static Properties readProperties(InputStream rawStream)
                                     throws DataFormatException,
                                            IOException

  Read a mapping from the stream, as defined by the I2P data structure spec, and store it into a Properties object. A mapping is a set of key / value pairs. It starts with a 2 byte Integer (ala readLong(rawStream, 2)) defining how many bytes make up the mapping. After that comes that many bytes making up a set of UTF-8 encoded characters. The characters are organized as key=value;. The key is a String (ala readString(rawStream)) unique as a key within the current mapping that does not include the UTF-8 characters '=' or ';'. After the key comes the literal UTF-8 character '='. After that comes a String (ala readString(rawStream)) for the value. Finally after that comes the literal UTF-8 character ';'. This key=value; is repeated until there are no more bytes (not characters!) left as defined by the first two byte integer.

  Parameters:
    `rawStream` - stream to read the mapping from
  Returns:
    mapping
  Throws:
    `DataFormatException` - if the format is invalid
    `IOException` - if there is a problem reading the data

### writeProperties

    public static void writeProperties(OutputStream rawStream,
                                       Properties props)
                                throws DataFormatException,
                                       IOException

  Write a mapping to the stream, as defined by the I2P data structure spec, and store it into a Properties object. See readProperties for the format. Output is sorted by property name. Property keys and values must not contain '=' or ';', this is not checked and they are not escaped Keys and values must be 255 bytes or less, Formatted length must not exceed 65535 bytes

  Parameters:
    `rawStream` - stream to write to
    `props` - properties to write out
  Throws:
    `DataFormatException` - if either is too long.
    `DataFormatException` - if there is not enough valid data to write out
    `IOException` - if there is an IO error writing out the data

### writeProperties

    public static void writeProperties(OutputStream rawStream,
                                       Properties props,
                                       boolean utf8)
                                throws DataFormatException,
                                       IOException

  Writes the props to the stream, sorted by property name. See readProperties() for the format. Property keys and values must not contain '=' or ';', this is not checked and they are not escaped Keys and values must be 255 bytes or less, Formatted length must not exceed 65535 bytes

  Parameters:
    `props` - source may be null
  Throws:
    `DataFormatException` - if either is too long. jrandom disabled UTF-8 in mid-2004, for performance reasons, i.e. slow foo.getBytes("UTF-8") Re-enable it so we can pass UTF-8 tunnel names through the I2CP SessionConfig. Use utf8 = false for RouterAddress (fast, non UTF-8) Use utf8 = true for SessionConfig (slow, UTF-8)
    `IOException`

### writeProperties

    public static void writeProperties(OutputStream rawStream,
                                       Properties props,
                                       boolean utf8,
                                       boolean sort)
                                throws DataFormatException,
                                       IOException

  Writes the props to the stream, sorted by property name if sort == true or if props is an OrderedProperties. See readProperties() for the format. Property keys and values must not contain '=' or ';', this is not checked and they are not escaped Keys and values must be 255 bytes or less, Formatted length must not exceed 65535 bytes

  Parameters:
    `props` - source may be null
    `sort` - should we sort the properties? (set to false if already sorted, e.g. OrderedProperties)
  Throws:
    `DataFormatException` - if either is too long. jrandom disabled UTF-8 in mid-2004, for performance reasons, i.e. slow foo.getBytes("UTF-8") Re-enable it so we can pass UTF-8 tunnel names through the I2CP SessionConfig. Use utf8 = false for RouterAddress (fast, non UTF-8) Use utf8 = true for SessionConfig (slow, UTF-8)
    `IOException`
  Since:
    0.8.7

### toProperties

    @Deprecated
    public static int toProperties(byte[] target,
                                              int offset,
                                              Properties props)
                            throws DataFormatException,
                                   IOException

  Deprecated.

  Throws:
    `DataFormatException`
    `IOException`

### fromProperties

    public static int fromProperties(byte[] source,
                                     int offset,
                                     Properties target)
                              throws DataFormatException

  Reads the props from the byte array and puts them in the Properties target See readProperties() for the format. Warning - confusing method name, Properties is the target. Strings must be UTF-8 encoded in the byte array.

  Parameters:
    `source` - source
    `target` - returned Properties
  Returns:
    new offset
  Throws:
    `DataFormatException`

### toProperties

    public static byte[] toProperties(Properties opts)
                               throws DataFormatException

  Writes the props to returned byte array, not sorted (unless the opts param is an OrderedProperties) Strings will be UTF-8 encoded in the byte array. See readProperties() for the format. Property keys and values must not contain '=' or ';', this is not checked and they are not escaped Keys and values must be 255 bytes or less, Formatted length must not exceed 65535 bytes Warning - confusing method name, Properties is the source.

  Throws:
    `DataFormatException` - if key, value, or total is too long

### toString

    public static String toString(Properties options)

  Pretty print the mapping, unsorted (unless the options param is an OrderedProperties)

### loadProps

    public static void loadProps(Properties props,
                                 File file)
                          throws IOException

  A more efficient Properties.load Some of the other differences: - This does not process or drop backslashes - '#' or ';' starts a comment line, but '!' does not - Leading whitespace is not trimmed - '=' is the only key-termination character (not ':' or whitespace) Note that the escaping of \r or \n was probably a mistake and should be taken out.

  Throws:
    `IOException`

### loadProps

    public static void loadProps(Properties props,
                                 File file,
                                 boolean forceLowerCase)
                          throws IOException

  Throws:
    `IOException`

### loadProps

    public static void loadProps(Properties props,
                                 InputStream inStr)
                          throws IOException

  Throws:
    `IOException`

### loadProps

    public static void loadProps(Properties props,
                                 InputStream inStr,
                                 boolean forceLowerCase)
                          throws IOException

  Throws:
    `IOException`

### storeProps

    public static void storeProps(Properties props,
                                  File file)
                           throws IOException

  Writes the props to the file, unsorted (unless props is an OrderedProperties) Note that this does not escape the \r or \n that are unescaped in loadProps() above. As of 0.8.1, file will be mode 600.

  Throws:
    `IOException`

### toString

    public static String toString(Collection col)

  Pretty print the collection

### toString

    public static String toString(byte[] buf)

### toString

    public static String toString(byte[] buf,
                                  int len)

### toDecimalString

    public static String toDecimalString(byte[] buf,
                                         int len)

### toHexString

    public static final String toHexString(byte[] data)

### fromHexString

    public static final byte[] fromHexString(String val)

### readLong

    public static long readLong(InputStream rawStream,
                                int numBytes)
                         throws DataFormatException,
                                IOException

  Read the stream for an integer as defined by the I2P data structure specification. Integers are a fixed number of bytes (numBytes), stored as unsigned integers in network byte order.

  Parameters:
    `rawStream` - stream to read from
    `numBytes` - number of bytes to read and format into a number
  Returns:
    number
  Throws:
    `DataFormatException` - if the stream doesn't contain a validly formatted number of that many bytes
    `EOFException` - since 0.8.2, if there aren't enough bytes to read the number
    `IOException` - if there is an IO error reading the number

### writeLong

    public static void writeLong(OutputStream rawStream,
                                 int numBytes,
                                 long value)
                          throws DataFormatException,
                                 IOException

  Write an integer as defined by the I2P data structure specification to the stream. Integers are a fixed number of bytes (numBytes), stored as unsigned integers in network byte order.

  Parameters:
    `value` - value to write out
    `rawStream` - stream to write to
    `numBytes` - number of bytes to write the number into (padding as necessary)
  Throws:
    `DataFormatException` - if the stream doesn't contain a validly formatted number of that many bytes
    `IOException` - if there is an IO error writing to the stream

### toLong

    public static byte[] toLong(int numBytes,
                                long value)
                         throws IllegalArgumentException

  Throws:
    `IllegalArgumentException`

### toLong

    public static void toLong(byte[] target,
                              int offset,
                              int numBytes,
                              long value)
                       throws IllegalArgumentException

  Throws:
    `IllegalArgumentException`

### fromLong

    public static long fromLong(byte[] src,
                                int offset,
                                int numBytes)

### readDate

    public static Date readDate(InputStream in)
                         throws DataFormatException,
                                IOException

  Read in a date from the stream as specified by the I2P data structure spec. A date is an 8 byte unsigned integer in network byte order specifying the number of milliseconds since midnight on January 1, 1970 in the GMT timezone. If the number is 0, the date is undefined or null. (yes, this means you can't represent midnight on 1/1/1970)

  Parameters:
    `in` - stream to read from
  Returns:
    date read, or null
  Throws:
    `DataFormatException` - if the stream doesn't contain a validly formatted date
    `IOException` - if there is an IO error reading the date

### writeDate

    public static void writeDate(OutputStream out,
                                 Date date)
                          throws DataFormatException,
                                 IOException

  Write out a date to the stream as specified by the I2P data structure spec.

  Parameters:
    `out` - stream to write to
    `date` - date to write (can be null)
  Throws:
    `DataFormatException` - if the date is not valid
    `IOException` - if there is an IO error writing the date

### toDate

    @Deprecated
    public static byte[] toDate(Date date)
                         throws IllegalArgumentException

  Deprecated. unused

  Throws:
    `IllegalArgumentException`

### toDate

    public static void toDate(byte[] target,
                              int offset,
                              long when)
                       throws IllegalArgumentException

  Throws:
    `IllegalArgumentException`

### fromDate

    public static Date fromDate(byte[] src,
                                int offset)
                         throws DataFormatException

  Throws:
    `DataFormatException`

### readString

    public static String readString(InputStream in)
                             throws DataFormatException,
                                    IOException

  Read in a string from the stream as specified by the I2P data structure spec. A string is 1 or more bytes where the first byte is the number of bytes (not characters!) in the string and the remaining 0-255 bytes are the non-null terminated UTF-8 encoded character array.

  Parameters:
    `in` - stream to read from
  Returns:
    UTF-8 string
  Throws:
    `DataFormatException` - if the stream doesn't contain a validly formatted string
    `EOFException` - since 0.8.2, if there aren't enough bytes to read the string
    `IOException` - if there is an IO error reading the string

### writeString

    public static void writeString(OutputStream out,
                                   String string)
                            throws DataFormatException,
                                   IOException

  Write out a string to the stream as specified by the I2P data structure spec. Note that the max size for a string allowed by the spec is 255 bytes. WARNING - this method destroys the encoding, and therefore violates the data structure spec.

  Parameters:
    `out` - stream to write string
    `string` - string to write out: null strings are perfectly valid, but strings of excess length will cause a DataFormatException to be thrown
  Throws:
    `DataFormatException` - if the string is not valid
    `IOException` - if there is an IO error writing the string

### readBoolean

    public static Boolean readBoolean(InputStream in)
                               throws DataFormatException,
                                      IOException

  Deprecated. unused

  Read in a boolean as specified by the I2P data structure spec. A boolean is 1 byte that is either 0 (false), 1 (true), or 2 (null)

  Parameters:
    `in` - stream to read from
  Returns:
    boolean value, or null
  Throws:
    `DataFormatException` - if the boolean is not valid
    `IOException` - if there is an IO error reading the boolean

### writeBoolean

    @Deprecated
    public static void writeBoolean(OutputStream out,
                                               Boolean bool)
                             throws DataFormatException,
                                    IOException

  Deprecated. unused

  Write out a boolean as specified by the I2P data structure spec. A boolean is 1 byte that is either 0 (false), 1 (true), or 2 (null)

  Parameters:
    `out` - stream to write to
    `bool` - boolean value, or null
  Throws:
    `DataFormatException` - if the boolean is not valid
    `IOException` - if there is an IO error writing the boolean

### fromBoolean

    @Deprecated
    public static Boolean fromBoolean(byte[] data,
                                                 int offset)

  Deprecated. unused

### toBoolean

    @Deprecated
    public static void toBoolean(byte[] data,
                                            int offset,
                                            boolean value)

  Deprecated. unused

### toBoolean

    @Deprecated
    public static void toBoolean(byte[] data,
                                            int offset,
                                            Boolean value)

  Deprecated. unused

### eq

    public static final boolean eq(Object lhs,
                                   Object rhs)

  Helper util to compare two objects, including null handling.

  This treats (null == null) as true, and (null == (!null)) as false.

### eq

    public static final boolean eq(Collection lhs,
                                   Collection rhs)

  Run a deep comparison across the two collections.

  This treats (null == null) as true, (null == (!null)) as false, and then comparing each element via eq(object, object).

  If the size of the collections are not equal, the comparison returns false. The collection order should be consistent, as this simply iterates across both and compares based on the value of each at each step along the way.

### eq

    public static final boolean eq(byte[] lhs,
                                   byte[] rhs)

  Run a comparison on the byte arrays, byte by byte.

  This treats (null == null) as true, (null == (!null)) as false, and unequal length arrays as false.

  Returns:
    Arrays.equals(lhs, rhs)

### eq

    @Deprecated
    public static final boolean eq(int lhs,
                                              int rhs)

  Deprecated. inefficient

  Compare two integers, really just for consistency.

### eq

    @Deprecated
    public static final boolean eq(long lhs,
                                              long rhs)

  Deprecated. inefficient

  Compare two longs, really just for consistency.

### eq

    @Deprecated
    public static final boolean eq(byte lhs,
                                              byte rhs)

  Deprecated. inefficient

  Compare two bytes, really just for consistency.

### eq

    public static final boolean eq(byte[] lhs,
                                   int offsetLeft,
                                   byte[] rhs,
                                   int offsetRight,
                                   int length)

  Unlike eq(byte[], byte[]), this returns false if both lhs and rhs are null.

  Throws:
    `AIOOBE` - if either array isn't long enough

### compareTo

    public static final int compareTo(byte[] lhs,
                                      byte[] rhs)

  treat bytes as unsigned

### xor

    public static final byte[] xor(byte[] lhs,
                                   byte[] rhs)

### xor

    public static final void xor(byte[] lhs,
                                 int startLeft,
                                 byte[] rhs,
                                 int startRight,
                                 byte[] out,
                                 int startOut,
                                 int len)

  xor the lhs with the rhs, storing the result in out.

  Parameters:
    `lhs` - one of the source arrays
    `startLeft` - starting index in the lhs array to begin the xor
    `rhs` - the other source array
    `startRight` - starting index in the rhs array to begin the xor
    `out` - output array
    `startOut` - starting index in the out array to store the result
    `len` - how many bytes into the various arrays to xor

### hashCode

    public static int hashCode(Object obj)

  Calculate the hashcode of the object, using 0 for null

### hashCode

    public static int hashCode(Date obj)

  Calculate the hashcode of the date, using 0 for null

### hashCode

    public static int hashCode(byte[] b)

  Calculate the hashcode of the byte array, using 0 for null

### hashCode

    public static int hashCode(Collection col)

  Calculate the hashcode of the collection, using 0 for null

### read

    public static int read(InputStream in,
                           byte[] target)
                    throws IOException

  This is different than InputStream.read(target), in that it does repeated reads until the full data is received.

  Throws:
    `IOException`

### read

    public static int read(InputStream in,
                           byte[] target,
                           int offset,
                           int length)
                    throws IOException

  This is different than InputStream.read(target, offset, length), in that it returns the new offset (== old offset + bytes read). It also does repeated reads until the full data is received.

  Returns:
    the new offset (== old offset + bytes read)
  Throws:
    `IOException`

### readLine

    public static String readLine(InputStream in)
                           throws IOException

  Read a newline delimited line from the stream, returning the line (without the newline), or null if EOF reached before the newline was found Warning - strips \n but not \r Warning - 8KB line length limit as of 0.7.13, @throws IOException if exceeded Warning - not UTF-8

  Throws:
    `IOException`

### readLine

    public static String readLine(InputStream in,
                                  Sha256Standalone hash)
                           throws IOException

  update the hash along the way Warning - strips \n but not \r Warning - 8KB line length limit as of 0.7.13, @throws IOException if exceeded Warning - not UTF-8

  Throws:
    `IOException`

### readLine

    @Deprecated
    public static boolean readLine(InputStream in,
                                              StringBuffer buf)
                            throws IOException

  Deprecated. use StringBuilder version

  Read in a line, placing it into the buffer (excluding the newline). Warning - strips \n but not \r Warning - 8KB line length limit as of 0.7.13, @throws IOException if exceeded Warning - not UTF-8

  Returns:
    true if the line was read, false if eof was reached before a newline was found
  Throws:
    `IOException`

### readLine

    @Deprecated
    public static boolean readLine(InputStream in,
                                              StringBuffer buf,
                                              Sha256Standalone hash)
                            throws IOException

  Deprecated. use StringBuilder version

  update the hash along the way Warning - strips \n but not \r Warning - 8KB line length limit as of 0.7.13, @throws IOException if exceeded Warning - not UTF-8

  Throws:
    `IOException`

### readLine

    public static boolean readLine(InputStream in,
                                   StringBuilder buf)
                            throws IOException

  Read in a line, placing it into the buffer (excluding the newline). Warning - strips \n but not \r Warning - 8KB line length limit as of 0.7.13, @throws IOException if exceeded Warning - not UTF-8

  Returns:
    true if the line was read, false if eof was reached before a newline was found
  Throws:
    `IOException`

### readLine

    public static boolean readLine(InputStream in,
                                   StringBuilder buf,
                                   Sha256Standalone hash)
                            throws IOException

  update the hash along the way Warning - strips \n but not \r Warning - 8KB line length limit as of 0.7.13, @throws IOException if exceeded Warning - not UTF-8

  Throws:
    `IOException`

### write

    public static void write(OutputStream out,
                             byte[] data,
                             Sha256Standalone hash)
                      throws IOException

  Throws:
    `IOException`

### sortStructures

    public static List<? extends DataStructure> sortStructures(Collection<? extends DataStructure> dataStructures)

  Sort based on the Hash of the DataStructure. Warning - relatively slow. WARNING - this sort order must be consistent network-wide, so while the order is arbitrary, it cannot be changed. Why? Just because it has to be consistent so signing will work. How to spec as returning the same type as the param? DEPRECATED - Only used by RouterInfo.

### formatDuration

    public static String formatDuration(long ms)

  NOTE: formatDuration2() recommended in most cases for readability

### formatDuration2

    public static String formatDuration2(long ms)

  Like formatDuration but with a non-breaking space after the number, 0 is unitless, and the unit is translated. This seems consistent with most style guides out there. Use only in HTML. Thresholds are a little lower than in formatDuration() also, as precision is less important in the GUI than in logging.

  Since:
    0.8.2

### formatSize

    public static String formatSize(long bytes)

  Caller should append 'B' or 'b' as appropriate NOTE: formatDuration2() recommended in most cases for readability

### formatSize2

    public static String formatSize2(long bytes)

  Like formatSize but with a non-breaking space after the number This seems consistent with most style guides out there. Use only in HTML

  Since:
    0.7.14

### stripHTML

    public static String stripHTML(String orig)

  Strip out any HTML (simply removing any less than / greater than symbols)

  Parameters:
    `orig` - may be null, returns empty string if null

### compress

    public static byte[] compress(byte[] orig)

  compress the data and return a new GZIP compressed array

### compress

    public static byte[] compress(byte[] orig,
                                  int offset,
                                  int size)

### compress

    public static byte[] compress(byte[] orig,
                                  int offset,
                                  int size,
                                  int level)

### decompress

    public static byte[] decompress(byte[] orig)
                             throws IOException

  decompress the GZIP compressed data (returning null on error)

  Throws:
    `IOException`

### decompress

    public static byte[] decompress(byte[] orig,
                                    int offset,
                                    int length)
                             throws IOException

  Throws:
    `IOException`

### getUTF8

    public static byte[] getUTF8(String orig)

  Same as orig.getBytes("UTF-8") but throws an unchecked RuntimeException instead of an UnsupportedEncodingException if no UTF-8, for ease of use.

  Throws:
    `RuntimeException`

### getUTF8

    public static byte[] getUTF8(StringBuffer orig)

  Deprecated. unused

  Same as orig.getBytes("UTF-8") but throws an unchecked RuntimeException instead of an UnsupportedEncodingException if no UTF-8, for ease of use.

  Throws:
    `RuntimeException`

### getUTF8

    public static String getUTF8(byte[] orig)

  Deprecated. unused

  Same as new String(orig, "UTF-8") but throws an unchecked RuntimeException instead of an UnsupportedEncodingException if no UTF-8, for ease of use.

  Throws:
    `RuntimeException`

### getUTF8

    public static String getUTF8(byte[] orig,
                                 int offset,
                                 int len)

  Deprecated. unused

  Same as new String(orig, "UTF-8") but throws an unchecked RuntimeException instead of an UnsupportedEncodingException if no UTF-8, for ease of use.

  Throws:
    `RuntimeException`

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