com.google.protobuf

Class Utf8.DecodeUtil

java.lang.Object

com.google.protobuf.Utf8.DecodeUtil

Enclosing class:

Utf8

private static class Utf8.DecodeUtil
extends java.lang.Object

Utility methods for decoding bytes into String. Callers are responsible for extracting bytes (possibly using Unsafe methods), and checking remaining bytes. All other UTF-8 validity checks and codepoint conversion happen in this class.

Constructor Summary

Constructors

Modifier	Constructor and Description
private	DecodeUtil()

Method Summary

Modifier and Type	Method and Description
private static void	handleFourBytes(byte byte1, byte byte2, byte byte3, byte byte4, char[] resultArr, int resultPos)
private static void	handleOneByte(byte byte1, char[] resultArr, int resultPos)
private static void	handleThreeBytes(byte byte1, byte byte2, byte byte3, char[] resultArr, int resultPos)
private static void	handleTwoBytes(byte byte1, byte byte2, char[] resultArr, int resultPos)
private static char	highSurrogate(int codePoint)
private static boolean	isNotTrailingByte(byte b) Returns whether the byte is not a valid continuation of the form '10XXXXXX'.
private static boolean	isOneByte(byte b) Returns whether this is a single-byte codepoint (i.e., ASCII) with the form '0XXXXXXX'.
private static boolean	isThreeBytes(byte b) Returns whether this is a three-byte codepoint with the form '110XXXXX'.
private static boolean	isTwoBytes(byte b) Returns whether this is a two-byte codepoint with the form '10XXXXXX'.
private static char	lowSurrogate(int codePoint)
private static int	trailingByteValue(byte b) Returns the actual value of the trailing byte (removes the prefix '10') for composition.

Methods inherited from class java.lang.Object

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

Constructor Detail

DecodeUtil

private DecodeUtil()

Method Detail

isOneByte

private static boolean isOneByte(byte b)

Returns whether this is a single-byte codepoint (i.e., ASCII) with the form '0XXXXXXX'.

isTwoBytes

private static boolean isTwoBytes(byte b)

Returns whether this is a two-byte codepoint with the form '10XXXXXX'.

isThreeBytes

private static boolean isThreeBytes(byte b)

Returns whether this is a three-byte codepoint with the form '110XXXXX'.

handleOneByte

private static void handleOneByte(byte byte1,
                                  char[] resultArr,
                                  int resultPos)

handleTwoBytes

private static void handleTwoBytes(byte byte1,
                                   byte byte2,
                                   char[] resultArr,
                                   int resultPos)
                            throws InvalidProtocolBufferException

Throws:

InvalidProtocolBufferException

handleThreeBytes

private static void handleThreeBytes(byte byte1,
                                     byte byte2,
                                     byte byte3,
                                     char[] resultArr,
                                     int resultPos)
                              throws InvalidProtocolBufferException

Throws:

InvalidProtocolBufferException

handleFourBytes

private static void handleFourBytes(byte byte1,
                                    byte byte2,
                                    byte byte3,
                                    byte byte4,
                                    char[] resultArr,
                                    int resultPos)
                             throws InvalidProtocolBufferException

Throws:

InvalidProtocolBufferException

isNotTrailingByte

private static boolean isNotTrailingByte(byte b)

Returns whether the byte is not a valid continuation of the form '10XXXXXX'.

trailingByteValue

private static int trailingByteValue(byte b)

Returns the actual value of the trailing byte (removes the prefix '10') for composition.

highSurrogate

private static char highSurrogate(int codePoint)

lowSurrogate

private static char lowSurrogate(int codePoint)