1. Unicode

• "Unicode" itself is not an Encoding method, but it is a code table that maps a character and its encoding character one-to-one.

• Unicode represents one character with 2 bytes. Therefore, the string encoded by Unicode ends with "\x00\x00", not "\x00".

• For this reason, the Null Terminator of string encoded by Unicode is 2 bytes : "\x00\x00"

UTF-16BE

• UTF-16 : 16-bit Unicode Transformation Format

• BE : Big Endian

According to Unicode, UTF-16BE is an encoding method to the form of Big Endian by one character to 16 bit (2 bytes).

• It uses BOM, "%uFEFF", at the beginning of the string to represent it as UTF-16BE.

BOM, Byte Order Mark

• Originally, BOM plays the role of giving information about the string to the program.

• In UTF-16BE, BOM gives information about Endian.

  BOM : %uFEFF : UTF-16BE : Big Endian

  BOM : %uFFFE : UTF-16LE : Little Endian

💡 UTF-16BE Format : "%uFEFF .... %u0000"

• Ex:) "A" : "%uFEFF%u0041%u0000"

2. ANSI

• "ANSI" itself is not an Encoding method, but it means the default local/codepage for my system.

• In ANSI, each CodePage has a code table and uses a special CodePage according to each language.

• In ANSI, an English character is represented as 1 byte. Therefore, the Null Terminator of an English string is 1 byte. " \x00

• Unlike UTF-16, ANSI doesn't use BOM.
  

💡 ANSI Format : "\x.. .. \x00"

• Ex:) "A" : "\x41\x00"

REFERENCE

1. Unicode, ANSI
2. UTF-16
3. BOM

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