Package com.google.common.io

Class LittleEndianDataInputStream

    • Constructor Detail

      • LittleEndianDataInputStream

        public LittleEndianDataInputStream(InputStream in)
        Creates a LittleEndianDataInputStream that wraps the given stream.
        Parameters:
        in - the stream to delegate to

    • Method Detail

      • readFully

        public void readFully(byte[] b)
               throws IOException
        Description copied from interface: java.io.DataInput
        Reads some bytes from an input stream and stores them into the buffer array b. The number of bytes read is equal to the length of b.

        This method blocks until one of the following conditions occurs:

        • b.length bytes of input data are available, in which case a normal return is made.
        • End of file is detected, in which case an EOFException is thrown.
        • An I/O error occurs, in which case an IOException other than EOFException is thrown.

        If b is null, a NullPointerException is thrown. If b.length is zero, then no bytes are read. Otherwise, the first byte read is stored into element b[0], the next one into b[1], and so on. If an exception is thrown from this method, then it may be that some but not all bytes of b have been updated with data from the input stream.

        Specified by:
        readFully in interface DataInput
        Parameters:
        b - the buffer into which the data is read.
        Throws:
        EOFException - if this stream reaches the end before reading all the bytes.
        IOException - if an I/O error occurs.

      • readFully

        public void readFully(byte[] b,
                      int off,
                      int len)
               throws IOException
        Description copied from interface: java.io.DataInput
        Reads len bytes from an input stream.

        This method blocks until one of the following conditions occurs:

        • len bytes of input data are available, in which case a normal return is made.
        • End of file is detected, in which case an EOFException is thrown.
        • An I/O error occurs, in which case an IOException other than EOFException is thrown.

        If b is null, a NullPointerException is thrown. If off is negative, or len is negative, or off+len is greater than the length of the array b, then an IndexOutOfBoundsException is thrown. If len is zero, then no bytes are read. Otherwise, the first byte read is stored into element b[off], the next one into b[off+1], and so on. The number of bytes read is, at most, equal to len.

        Specified by:
        readFully in interface DataInput
        Parameters:
        b - the buffer into which the data is read.
        off - an int specifying the offset in the data array b.
        len - an int specifying the number of bytes to read.
        Throws:
        EOFException - if this stream reaches the end before reading all the bytes.
        IOException - if an I/O error occurs.

      • skipBytes

        public int skipBytes(int n)
              throws IOException
        Description copied from interface: java.io.DataInput
        Makes an attempt to skip over n bytes of data from the input stream, discarding the skipped bytes. However, it may skip over some smaller number of bytes, possibly zero. This may result from any of a number of conditions; reaching end of file before n bytes have been skipped is only one possibility. This method never throws an EOFException. The actual number of bytes skipped is returned.
        Specified by:
        skipBytes in interface DataInput
        Parameters:
        n - the number of bytes to be skipped.
        Returns:
        the number of bytes actually skipped.
        Throws:
        IOException - if an I/O error occurs.

      • readUnsignedByte

        @CanIgnoreReturnValue
public int readUnsignedByte()
                     throws IOException
        Description copied from interface: java.io.DataInput
        Reads one input byte, zero-extends it to type int, and returns the result, which is therefore in the range 0 through 255. This method is suitable for reading the byte written by the writeByte method of interface DataOutput if the argument to writeByte was intended to be a value in the range 0 through 255.
        Specified by:
        readUnsignedByte in interface DataInput
        Returns:
        the unsigned 8-bit value read.
        Throws:
        EOFException - if this stream reaches the end before reading all the bytes.
        IOException - if an I/O error occurs.

      • readUTF

        @CanIgnoreReturnValue
public String readUTF()
               throws IOException
        Description copied from interface: java.io.DataInput
        Reads in a string that has been encoded using a modified UTF-8 format. The general contract of readUTF is that it reads a representation of a Unicode character string encoded in modified UTF-8 format; this string of characters is then returned as a String.

        First, two bytes are read and used to construct an unsigned 16-bit integer in exactly the manner of the readUnsignedShort method . This integer value is called the UTF length and specifies the number of additional bytes to be read. These bytes are then converted to characters by considering them in groups. The length of each group is computed from the value of the first byte of the group. The byte following a group, if any, is the first byte of the next group.

        If the first byte of a group matches the bit pattern 0xxxxxxx (where x means "may be 0 or 1"), then the group consists of just that byte. The byte is zero-extended to form a character.

        If the first byte of a group matches the bit pattern 110xxxxx, then the group consists of that byte a and a second byte b. If there is no byte b (because byte a was the last of the bytes to be read), or if byte b does not match the bit pattern 10xxxxxx, then a UTFDataFormatException is thrown. Otherwise, the group is converted to the character: 

        (char)(((a & 0x1F) << 6) | (b & 0x3F))
        If the first byte of a group matches the bit pattern 1110xxxx, then the group consists of that byte a and two more bytes b and c. If there is no byte c (because byte a was one of the last two of the bytes to be read), or either byte b or byte c does not match the bit pattern 10xxxxxx, then a UTFDataFormatException is thrown. Otherwise, the group is converted to the character: 
        
 (char)(((a & 0x0F) << 12) | ((b & 0x3F) << 6) | (c & 0x3F))
        If the first byte of a group matches the pattern 1111xxxx or the pattern 10xxxxxx, then a UTFDataFormatException is thrown.

        If end of file is encountered at any time during this entire process, then an EOFException is thrown.

        After every group has been converted to a character by this process, the characters are gathered, in the same order in which their corresponding groups were read from the input stream, to form a String, which is returned.

        The writeUTF method of interface DataOutput may be used to write data that is suitable for reading by this method.

        Specified by:
        readUTF in interface DataInput
        Returns:
        a Unicode string.
        Throws:
        EOFException - if this stream reaches the end before reading all the bytes.
        IOException - if an I/O error occurs.
        UTFDataFormatException - if the bytes do not represent a valid modified UTF-8 encoding of a string.

      • readByte

        @CanIgnoreReturnValue
public byte readByte()
              throws IOException
        Description copied from interface: java.io.DataInput
        Reads and returns one input byte. The byte is treated as a signed value in the range -128 through 127, inclusive. This method is suitable for reading the byte written by the writeByte method of interface DataOutput.
        Specified by:
        readByte in interface DataInput
        Returns:
        the 8-bit value read.
        Throws:
        EOFException - if this stream reaches the end before reading all the bytes.
        IOException - if an I/O error occurs.

      • readBoolean

        @CanIgnoreReturnValue
public boolean readBoolean()
                    throws IOException
        Description copied from interface: java.io.DataInput
        Reads one input byte and returns true if that byte is nonzero, false if that byte is zero. This method is suitable for reading the byte written by the writeBoolean method of interface DataOutput.
        Specified by:
        readBoolean in interface DataInput
        Returns:
        the boolean value read.
        Throws:
        EOFException - if this stream reaches the end before reading all the bytes.
        IOException - if an I/O error occurs.