Utf 16 codepoints to utf 8 table code#
The encoding of Unicode code points is defined by various encoding standards that are part of Unicode: The first plane from 0 to 0xFFFF is called Basic Multilingual Plane (BMP) and covers all human languages. One way of categorizing the code points is by dividing them into planes of 2^16 code points each. For example, codepoint U+0048 refers to 'H'. The U+ notation is used to refer to code points in the unicode table. The first 256 code points are the exact same as Latin-1. It provides a massive code page with over 70000 defined characters. It even has code points for fictional languages like klingon and symbols that made sense to ancient civilizations like Phaistos Disc. The Unicode standard attempts to define code points for characters in every language known to man. TSCII, ASCII are meant to represent the characters of a single language and thus cannot be used to represent text that is composed in multiple languages. These terms, however, become important when discussing Unicode. Note that the terms defined above were not very relevant for standards like ASCII since they define the character set, the encoding, code page all in one standard. The characters in a code page is called the character set. Another encoding scheme could encode code points using a variable length byte encoding scheme - frequently used code points are encoded as 2 bytes to conserve space and other code points as 3 bytes. For example, an encoding scheme could represent the code points as a 32-bit integer with it's high byte (MSB) first. An encoding scheme defines how code points are represented in memory. Note that the code point is just a number and it doesn't specify how the number is stored in memory.
To be technically correct, one must say codepoint 0x51 represents the character 'Q' and codepoint 0x74 represents the character 't' in the ASCII code page and so on. The tables themselves are called code pages. The numbers defined by the encoding tables are called codepoints. 1 Code point, Code page, Character set, EncodingĬode point, Code page, Character set, Encoding.For example, there is a TSCII for tamil that defines tamil characters in the 128-255 range. So, in the absence of standards, organizations have made their own standards and specified their own characters for the range 128-255. The range 128-255 consists mostly of characters of Western European languages (Dutch, Spanish etc).Įncodings like ASCII and latin-1 are inadequate to represent characters of other languages, say, tamil. The ISO-8859-1 or the latin-1 encoding is a 8-bit encoding that is ASCII-compatible because it defines the exact same characters as ASCII for 0-127. The ASCII only defines 127 characters and since one needs only 7-bits to encode 0-127, it is referred as a 7-bit encoding. It specifies that a 'Q' is represented as 0x51, 't' as 0x74 and so on. For example, the ASCII encoding standard specifies the encoding for all characters of the English language ( Ascii Table has a nice graph). Written By : Girish Ramakrishnan, ForwardBias TechnologiesĮncoding standards specify how strings are represented in memory.
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