![]() Must map all code points (except surrogate code points) to The ISO/IEC 10646 standard uses the term “UCS transformationįormat” for UTF the two terms are merely synonyms for the same concept.Įach UTF is reversible, thus every UTF supports lossless round tripping: mappingįrom any Unicode coded character sequence S to a sequence of bytes andīack will produce S again. UTS #6: A Standard Compression Scheme for Unicode (SCSU).Ī Unicode transformation format (UTF) is anĪlgorithmic mapping from every Unicode code point (except surrogate code There are compression transformations such as the one described in the Unicode data, including UTF-8, UTF-16 and UTF-32. Yes, there are several possible representations of Q: Can Unicode text be represented in more than one way? One or two 16-bit code units, or a single 32-bit code unit. Depending on theĮncoding form you choose (UTF-8, UTF-16, or UTF-32), each character will then be represented either as a sequence of one to four 8-bit bytes, The Unicode Standard encodes characters in the range U+0000.U+10FFFF, which amounts to a 21-bit code space. The first version of Unicode was a 16-bit encoding, from 1991 to 1995, but starting with Unicode 2.0 (July, 1996), it has notīeen a 16-bit encoding. General questions, relating to UTF or Encoding Form Why wouldn’t I always use a protocol that requires a BOM?.How do I tag data that does not interpret U+FEFF as a BOM?. ![]() I am using a protocol that has BOM at the start of text.What should I do with U+FEFF in the middle of a file?.Can a UTF-8 data stream contain the BOM character (in UTF-8 form)? If yes, does it affect the byte order?.When a BOM is used, is it only in 16-bit Unicode text?.How do I convert an unpaired UTF-16 surrogate to UTF-32?.How do I convert a UTF-16 surrogate pair such as to UTF-32? As one or as twoĔ-byte sequences?.Are there exceptions to the rule of exclusively using string parameters in APIs?.Doesn’t it cause a problem to have UTF-16 string APIs, instead of UTF-32 char APIs?.How about using UTF-32 interfaces in my APIs?.Should I use UTF-32 (or UCS-4) for storing Unicode strings in memory?.What is the difference between UCS-2 and UTF-16?.How should I handle supplementary characters in my code?.Because most supplementary characters are uncommon, does that mean I can ignore them?.What about noncharacters? Are they invalid?.Are there any 16-bit values that are invalid?.Will UTF-16 ever be extended to more than a million characters?.What is the algorithm to convert from UTF-16 to character codes?.How do I convert an unpaired UTF-16 surrogate to UTF-8?.How do I convert a UTF-16 surrogate pair such as to UTF-8? As one 4-byte sequence or as two separate 3-byte sequences?.Is the UTF-8 encoding scheme the same irrespective of whether the underlying system uses ASCII or EBCDIC encoding?.Is the UTF-8 encoding scheme the same irrespective of whether the underlying processor is little endian or big endian?.Which of these formats is the most standard?.Is there a standard method to package a Unicode character so it fits an 8-Bit ASCII stream?.Are there any byte sequences that are not generated by a UTF? How should I interpret them?.Why do some UTFs have a BE or LE in their label, as in UTF-16LE?.What are some of the differences between the UTFs?.Which of the UTFs do I need to support?.Where can I get more information on encoding forms?.Can Unicode text be represented in more than one way?.Frequently Asked Questions UTF-8, UTF-16, UTF-32 & BOM General questions, relating to UTF or Encoding Forms
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