com.amazonaws.encryptionsdk.internal

Class PrimitivesParser

java.lang.Object

com.amazonaws.encryptionsdk.internal.PrimitivesParser

public class PrimitivesParser
extends Object

This class implements methods for parsing the primitives ( byte, short, int, long) in Java from a byte array.

Constructor Summary

Constructors

Constructor and Description
PrimitivesParser()

Method Summary

Modifier and Type	Method and Description
static byte	parseByte(byte[] b, int off) Parse a single byte in the provided bytes.
static int	parseInt(byte[] b, int off) Parse an integer primitive type in the provided bytes.
static long	parseLong(byte[] b, int off) Parse a long primitive type in the provided bytes.
static short	parseShort(byte[] b, int off) Parse a short primitive type in the provided bytes.
static int	parseUnsignedShort(byte[] b, int off) Equivalent to parseShort(byte[], int) except the 2 bytes are treated as an unsigned value (and thus returned as an into to avoid overflow).
static void	writeUnsignedShort(DataOutput out, int uShort) Writes 2 bytes containing the unsigned value uShort to out.

Methods inherited from class java.lang.Object

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

Constructor Detail

PrimitivesParser

public PrimitivesParser()

Method Detail

parseLong

public static long parseLong(byte[] b,
                             int off)
                      throws ParseException

Parse a long primitive type in the provided bytes. It looks for 8 bytes in the provided bytes starting at the specified off.

If successful, it returns the value of the parsed long type. On failure, it throws a parse exception.

Parameters:

b - the byte array to parse.

off - the offset in the byte array to use when parsing.

Returns:

the parsed long value.

Throws:

ParseException - if there are not sufficient bytes.

parseInt

public static int parseInt(byte[] b,
                           int off)
                    throws ParseException

Parse an integer primitive type in the provided bytes. It looks for 4 bytes in the provided bytes starting at the specified off.

If successful, it returns the value of the parsed integer type. On failure, it throws a parse exception.

Parameters:

b - the byte array to parse.

off - the offset in the byte array to use when parsing.

Returns:

the parsed integer value.

Throws:

ParseException - if there are not sufficient bytes.

parseShort

public static short parseShort(byte[] b,
                               int off)

Parse a short primitive type in the provided bytes. It looks for 2 bytes in the provided bytes starting at the specified off.

If successful, it returns the value of the parsed short type. On failure, it throws a parse exception.

Parameters:

b - the byte array to parse.

off - the offset in the byte array to use when parsing.

Returns:

the parsed short value.

Throws:

ParseException - if there are not sufficient bytes.

parseUnsignedShort

public static int parseUnsignedShort(byte[] b,
                                     int off)

Equivalent to parseShort(byte[], int) except the 2 bytes are treated as an unsigned value (and thus returned as an into to avoid overflow).

writeUnsignedShort

public static void writeUnsignedShort(DataOutput out,
                                      int uShort)
                               throws IOException

Writes 2 bytes containing the unsigned value uShort to out.

Throws:

IOException

parseByte

public static byte parseByte(byte[] b,
                             int off)

Parse a single byte in the provided bytes. It looks for a byte in the provided bytes starting at the specified off.

If successful, it returns the value of the parsed byte. On failure, it throws a parse exception.

Parameters:

b - the byte array to parse.

off - the offset in the byte array to use when parsing.

Returns:

the parsed byte value.

Throws:

ParseException - if there are not sufficient bytes.