com.milaboratory.core.io.util

Class IOUtil

java.lang.Object

com.milaboratory.core.io.util.IOUtil

public class IOUtil
extends Object

IOUtils contains methods for compact encoding of 32 and 64 bit integers.

Code of this class is partially copied from com.google.protobuf.CodedOutputStream and com.google.protobuf.CodedInputStream classes from Google's protobuf library.

Constructor Summary

Constructors

Constructor and Description
IOUtil()

Method Summary

Methods

Modifier and Type	Method and Description
static int	computeRawVarint32Size(int value) Compute the number of bytes that would be needed to encode a varint.
static int	computeRawVarint64Size(long value) Compute the number of bytes that would be needed to encode a varint.
static int	decodeZigZag32(int n) Decode a ZigZag-encoded 32-bit value.
static long	decodeZigZag64(long n) Decode a ZigZag-encoded 64-bit value.
static int	encodeZigZag32(int n) Encode a ZigZag-encoded 32-bit value.
static long	encodeZigZag64(long n) Encode a ZigZag-encoded 64-bit value.
static int	readRawVarint32(InputStream is, int eofVaule) Read a raw Varint from the stream.
static long	readRawVarint64(InputStream is, long eofValue) Read a raw Varint from the stream.
static void	writeRawVarint32(OutputStream os, int value) Encode and write a varint.
static void	writeRawVarint64(OutputStream os, long value) Encode and write a varint.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

IOUtil

public IOUtil()

Method Detail

readRawVarint32

public static int readRawVarint32(InputStream is,
                  int eofVaule)
                           throws IOException

Read a raw Varint from the stream.

Based on com.google.protobuf.CodedInputStream class from Google's protobuf library.

Throws:

IOException

readRawVarint64

public static long readRawVarint64(InputStream is,
                   long eofValue)
                            throws IOException

Read a raw Varint from the stream.

Based on com.google.protobuf.CodedInputStream class from Google's protobuf library.

Throws:

IOException

writeRawVarint32

public static void writeRawVarint32(OutputStream os,
                    int value)
                             throws IOException

Encode and write a varint. value is treated as unsigned, so it won't be sign-extended if negative.

Copied from com.google.protobuf.CodedOutputStream from Google's protobuf library.

Throws:

IOException

computeRawVarint32Size

public static int computeRawVarint32Size(int value)

Compute the number of bytes that would be needed to encode a varint. value is treated as unsigned, so it won't be sign-extended if negative.

Copied from com.google.protobuf.CodedOutputStream from Google's protobuf library.

writeRawVarint64

public static void writeRawVarint64(OutputStream os,
                    long value)
                             throws IOException

Encode and write a varint.

Copied from com.google.protobuf.CodedOutputStream from Google's protobuf library.

Throws:

IOException

computeRawVarint64Size

public static int computeRawVarint64Size(long value)

Compute the number of bytes that would be needed to encode a varint.

Copied from com.google.protobuf.CodedOutputStream from Google's protobuf library.

encodeZigZag32

public static int encodeZigZag32(int n)

Encode a ZigZag-encoded 32-bit value. ZigZag encodes signed integers into values that can be efficiently encoded with varint. (Otherwise, negative values must be sign-extended to 64 bits to be varint encoded, thus always taking 10 bytes on the wire.)

Copied from com.google.protobuf.CodedOutputStream from Google's protobuf library.

Parameters:

n - A signed 32-bit integer.

Returns:

An unsigned 32-bit integer, stored in a signed int because Java has no explicit unsigned support.

encodeZigZag64

public static long encodeZigZag64(long n)

Encode a ZigZag-encoded 64-bit value. ZigZag encodes signed integers into values that can be efficiently encoded with varint. (Otherwise, negative values must be sign-extended to 64 bits to be varint encoded, thus always taking 10 bytes on the wire.)

Copied from com.google.protobuf.CodedOutputStream from Google's protobuf library.

Parameters:

n - A signed 64-bit integer.

Returns:

An unsigned 64-bit integer, stored in a signed int because Java has no explicit unsigned support.

decodeZigZag32

public static int decodeZigZag32(int n)

Decode a ZigZag-encoded 32-bit value. ZigZag encodes signed integers into values that can be efficiently encoded with varint. (Otherwise, negative values must be sign-extended to 64 bits to be varint encoded, thus always taking 10 bytes on the wire.)

Copied from com.google.protobuf.CodedInputStream from Google's protobuf library.

Parameters:

n - An unsigned 32-bit integer, stored in a signed int because Java has no explicit unsigned support.

Returns:

A signed 32-bit integer.

decodeZigZag64

public static long decodeZigZag64(long n)

Decode a ZigZag-encoded 64-bit value. ZigZag encodes signed integers into values that can be efficiently encoded with varint. (Otherwise, negative values must be sign-extended to 64 bits to be varint encoded, thus always taking 10 bytes on the wire.)

Copied from com.google.protobuf.CodedInputStream from Google's protobuf library.

Parameters:

n - An unsigned 64-bit integer, stored in a signed int because Java has no explicit unsigned support.

Returns:

A signed 64-bit integer.