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{{redirect|BOCU}}
'''Binary Ordered Compression for Unicode''' ('''BOCU''') is a [[MIME]] compatible Unicode compression scheme. BOCU-1 combines the wide applicability of [[UTF-8]] with the compactness of [[Standard Compression Scheme for Unicode]] (SCSU). This [[Unicode]] [[character encoding|encoding]] is designed to be useful for compressing short strings, and maintains code point order. BOCU-1 is specified in a Unicode Technical Note.<ref>{{cite web |url=http://www.unicode.org/notes/tn6/#Introduction |title=UTN #6: BOCU-1|date=2006-02-04 |author=Markus Scherer, [[Mark Davis (Unicode)|Mark Davis]] |accessdate=2008-05-18}}</ref>
For comparison SCSU was adopted as standard Unicode compression scheme with a byte/code point ratio similar to language-specific [[code page]]s. SCSU has not been widely adopted, as it is not suitable for MIME “text” media types. For example, SCSU cannot be used directly in emails and similar protocols. SCSU requires a complicated encoder design for good performance. Usually, the [[ZIP file format|zip]], [[bzip2]], and other industry standard algorithms compact larger amounts of Unicode text more efficiently.<ref>{{cite web |url=http://unicode.org/notes/tn14 |title=UTN #14: A survey of Unicode compression
|date=2004-01-30 |first=Doug |last=Ewell |accessdate=2008-06-13 |format=PDF }}</ref>


Both SCSU<ref>[http://www.iana.org/assignments/charset-reg/SCSU IANA registration record for SCSU]</ref> and BOCU-1<ref>[http://www.iana.org/assignments/charset-reg/BOCU-1 IANA registration record for BOCU-1]</ref> are [[Internet Assigned Numbers Authority|IANA]] registered charsets.


== Details ==
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All numbers in this section are [[hexadecimal]], and all ranges are inclusive.
 
Code points from <code>U+0000</code> to <code>U+0020</code> are encoded in BOCU-1 as the corresponding byte value. All other code points (that is, <code>U+0021</code> through <code>U+D7FF</code> and <code>U+E000</code> through <code>U+10FFFF</code>) are encoded as a difference between the code point and a normalized version of the most recently encoded code point that was not an ASCII space (<code>U+0020</code>). The initial state is <code>U+0040</code>. The normalization mapping is as follows:
 
{| class="wikitable"
! style="width: auto;" | Code range
! style="width: auto;" | Normalized code point
! style="width: auto;" | Notes
|-
| <code>U+3040</code> to <code>U+309F</code>
| <code>U+3070</code>
| [[Hiragana]]
|-
| <code>U+4E00</code> to <code>U+9FA5</code>
| <code>U+7711</code>
| [[Unihan]]
|-
| <code>U+AC00</code> to <code>U+D7A3</code>
| <code>U+C1D1</code>
| [[Hangul]]
|-
| <code>U+0020</code>
! <small>encoder state kept as is</small>
| Space
|-
| <code>U+''hhhh''00</code> to <code>U+''hhhh''7F</code><br /><small>(excluding ranges above)</small>
| <code>U+hhhh40</code>
| middle<br />of 128
|-
| <code>U+''hhhh''80</code> to <code>U+''hhhh''FF</code><br /><small>(excluding ranges above)</small>
| <code>U+''hhhh''C0</code>
| middle<br />of 128
|}
 
The difference between the current code point and the normalized previous code point is encoded as follows:
 
{| class="wikitable"
! style="width: auto;" | Difference range
! style="width: auto;" | Byte sequence range<br><small>(see below)</small>
|-
| <code>-10FF9F</code> to <code>-2DD0D</code>
| <code>21</code> <code>F0</code> <code>58</code> <code>D9</code> to <code>21</code> <code>FF</code> <code>FF</code> <code>FF</code>
|-
| <code>-2DD0C</code> to <code>-2912</code>
| <code>22</code> <code>01</code> <code>01</code> to <code>24</code> <code>FF</code> <code>FF</code>
|-
| <code>-2911</code> to <code>-41</code>
| <code>25</code> <code>01</code> to <code>4F</code> <code>FF</code>
|-
| <code>-40</code> to <code>3F</code>
| <code>50</code> to <code>CF</code>
|-
| <code>40</code> to <code>2910</code>
| <code>D0</code> <code>01</code> to <code>FA</code> <code>FF</code>
|-
| <code>2911</code> to <code>2DD0B</code>
| <code>FB</code> <code>01</code> <code>01</code> to <code>FD</code> <code>FF</code> <code>FF</code>
|-
| <code>2DD0C</code> to <code>10FFBF</code>
| <code>FE</code> <code>01</code> <code>01</code> <code>01</code> to <code>FE</code> <code>19</code> <code>B4</code> <code>54</code>
|}
 
Each byte range is [[lexicographical order|lexicographically ordered]] with the following thirteen byte values excluded: <code>00 07 08 09 0A 0B 0C 0D 0E 0F 1A 1B 20</code>. For example, the byte sequence <code>FC 06 FF</code>, coding for a difference of <code>1156B</code>, is immediately followed by the byte sequence <code>FC 10 01</code>, coding for a difference of <code>1156C</code>.
 
Any ASCII input <code>U+0000</code> to <code>U+007F</code> excluding space <code>U+0020</code> resets the encoder to <code>U+0040</code>. Because the above mentioned values cover line end code points <code>U+000D</code> and <code>U+000A</code> ''as is'' (<code>0D 0A</code>), the encoder is in a known state at the begin of each line. The corruption of a single byte therefore affects at most one line. For comparison, the corruption of a single byte in [[UTF-8]] affects at most one code point, for [[Standard Compression Scheme for Unicode|SCSU]] it can affect the entire document.
 
BOCU-1 offers a similar robustness also for input texts without the above mentioned values with the special reset code <code>0xFF</code>. When a decoder finds this octet it resets its state to <code>U+0040</code> as for a line end. The use of <code>0xFF</code> reset bytes is not recommended in the BOCU-1 specification, because it conflicts with other BOCU-1 design goals, notably the ''binary order''.
 
The optional use of a signature [[Byte-order mark|<code>U+FEFF</code>]] at the begin of BOCU-1 encoded texts, i.e. the BOCU-1 byte sequence <code>FB EE 28</code>, changes the initial state <code>U+0040</code> to <code>U+FE80</code>. In other words the signature cannot simply be stripped as in most other Unicode encoding schemes. Adding a reset byte after the signature (<code>FB EE 28 FF</code>) could avoid this effect, but the BOCU-1 specification does not recommend this practice.
 
In theory [[UTF-1]] and [[UTF-8]] could encode the original [[Universal Character Set|UCS-4]] set with 31 bits up to <code>7FFFFFFF</code>. BOCU-1 and [[UTF-16]] can encode
the modern [[Unicode]] set from <code>U+0000</code> to <code>U+10FFFF</code>.  Excluding the thirteen ''protected'' code points encoded as single octets BOCU-1 can use <math>256 - 13 = 243</math> octets in multi-byte encodings. BOCU-1 needs at most four bytes consisting of a lead byte and one to three trail bytes.  The trail bytes encode a remaining "[[modulo operation|modulo]] 243" (base 243) difference, the lead byte determines the number of trail bytes and an initial difference.
Note that the reset byte <code>0xFF</code> is not ''protected'' and can occur as trail byte.
 
== Patent ==
 
The general BOCU algorithm is covered by [[United States patent law|United States Patent]] #6,737,994, which also mentions the specific BOCU-1 implementation.<ref>{{cite web |url=http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=6737994.PN.&OS=PN/6737994&RS=PN/6737994 |title=United States Patent #6,737,994, “Binary-ordered compression for unicode” |date=2004-05-18 |author=[[Mark Davis (Unicode)|Davis]], et al. |accessdate=2008-11-16}}</ref> [[IBM]], which employed both of the inventors of BOCU-1 at the time it was created, states in the Unicode Technical Note that implementers of a "fully compliant version of BOCU-1" must contact IBM to request a royalty-free license.<ref>{{cite web |url=http://www.unicode.org/notes/tn6/#Intellectual_Property |title=UTN #6: BOCU-1|date=2006-02-04 |author=Markus Scherer, [[Mark Davis (Unicode)|Mark Davis]] |accessdate=2008-11-16}}</ref> BOCU-1 is the only Unicode compression scheme described on the Unicode Web site that is known to be encumbered with [[intellectual property]] restrictions.
 
By contrast, IBM also filed for a patent on [[UTF-EBCDIC]], but it chose in that case to make the documentation and [[Character_encoding#Modern_encoding_model|encoding scheme]] “freely available to anyone concerned towards making the transformation format as part of the UCS standards,” instead of requiring implementers to request a license.<ref>{{cite web |url=http://www.unicode.org/reports/tr16/#Bibliography |title=UTR #16: UTF-EBCDIC|date=2002-04-16 |author=V.S. Umamaheswaran |accessdate=2008-11-16}}</ref>
 
== References ==
{{reflist}}
 
== See also ==
* [[UTF-1]] contains a comparison of the UTF-1, [[UTF-8]], and BOCU-1 designs
* [[International Components for Unicode]] A library that can convert between BOCU-1 and other Unicode encodings
 
{{Unicode navigation}}
{{character encoding}}
 
{{DEFAULTSORT:Binary Ordered Compression For Unicode}}
[[Category:Data compression]]
[[Category:Unicode Transformation Formats]]

Latest revision as of 16:48, 1 March 2014


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