Character Set Encoding Maps - Unicode UTF-32, UTF-32BE, UTF-32LE

Unicode Tutorials - Herong's Tutorial Examples

∟Character Set Encoding Maps - Unicode UTF-32, UTF-32BE, UTF-32LE

This section provides a tutorial example of analyzing and printing character set encoding maps for 3 encoding, UTF-32, UTF-32BE, and UTF-32LE, for Unicode character set.

Here is the output of my sample program, EncodingAnalyzer2.java, for UTF-32 encoding with Java SE 7:

C:\herong>java EncodingAnalyzer2 UTF-32
UTF-32 encoding:
00000000 > 00 00 00 00 - 000000FF > 00 00 00 FF
00000100 > 00 00 01 00 - 000001FF > 00 00 01 FF
00000200 > 00 00 02 00 - 000002FF > 00 00 02 FF
......
0000D700 > 00 00 D7 00 - 0000D7FF > 00 00 D7 FF
0000D800 > 00 00 FF FD - 0000DFFF > 00 00 FF FD (invalid range)
0000E000 > 00 00 E0 00 - 0000E0FF > 00 00 E0 FF
0000E100 > 00 00 E1 00 - 0000E1FF > 00 00 E1 FF
0000E200 > 00 00 E2 00 - 0000E2FF > 00 00 E2 FF
....
0010FF00 > 00 10 FF 00 - 0010FFFF > 00 10 FF FF

The encoding map of UTF-32, which is another encoding used for the Unicode character set, is the simplest encoding:

The output sequence is a fixed length of 4 bytes.
It is not backward compatible with US-ASCII encoding.
Surprisingly, there is no leading BOM (Byte Order Mark) 0x0000FEFF in the output sequence!

Here is the output of my sample program, EncodingAnalyzer2.java, for UTF-32BE encoding with Java SE 7:

C:\herong>java EncodingAnalyzer2 UTF-32BE
UTF-32BE encoding:
00000000 > 00 00 00 00 - 000000FF > 00 00 00 FF
00000100 > 00 00 01 00 - 000001FF > 00 00 01 FF
00000200 > 00 00 02 00 - 000002FF > 00 00 02 FF
......
0000D700 > 00 00 D7 00 - 0000D7FF > 00 00 D7 FF
0000D800 > 00 00 FF FD - 0000DFFF > 00 00 FF FD (invalid range)
0000E000 > 00 00 E0 00 - 0000E0FF > 00 00 E0 FF
0000E100 > 00 00 E1 00 - 0000E1FF > 00 00 E1 FF
0000E200 > 00 00 E2 00 - 0000E2FF > 00 00 E2 FF
....
0010FF00 > 00 10 FF 00 - 0010FFFF > 00 10 FF FF

The output of UTF-32BE is identical to UTF-32.

Here is the output of my sample program, EncodingAnalyzer2.java, for UTF-32LE encoding with Java SE 7:

C:\herong>java EncodingAnalyzer2 UTF-32LE
UTF-32LE encoding:
00000000 > 00 00 00 00 - 0010FFFF > FF FF 10 00

Obviously, my sample program is not doing a good job on UTF-32LE. The last byte of the encode sequence never changes with UTF-32LE and my sample program uses the last byte to detect encoding pattern changes.