Package com.google.protobuf

Class 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 Description
      private DecodeUtil()  

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method 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)

      • 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)