Path: csiph.com!usenet.pasdenom.info!weretis.net!feeder4.news.weretis.net!storethat.news.telefonica.de!telefonica.de!news-1.dfn.de!news.dfn.de!news.informatik.hu-berlin.de!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail From: Robert Klemme Newsgroups: comp.lang.java.programmer Subject: Re: offsets in a FileChannel ... Date: Mon, 25 Feb 2013 21:50:18 +0100 Lines: 33 Message-ID: References: <2rkmi8hjbqisimmd7bcsalbqjs6f8l9ngp@4ax.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Trace: individual.net I5fqLNU834WNt48+VXQ0eAbuN5J1bw0XxT49UA16xMCHp1Z88= Cancel-Lock: sha1:NAD11r/go7MKBdlgZwjdst1edUM= User-Agent: Mozilla/5.0 (Windows NT 6.0; WOW64; rv:17.0) Gecko/20130215 Thunderbird/17.0.3 In-Reply-To: <2rkmi8hjbqisimmd7bcsalbqjs6f8l9ngp@4ax.com> Xref: csiph.com comp.lang.java.programmer:22513 On 25.02.2013 13:09, Roedy Green wrote: > On Sat, 23 Feb 2013 15:39:08 +0100, Robert Klemme > wrote, quoted or indirectly quoted > someone who said : > >> UTF8 is not an encoding with a fixed width. > > You could use UTF-16. Then you could interconvert 8 byte and char > offsets. with a simple shift. I don't. And he don't either since UTF-16 isn't a fixed width encoding. http://www.unicode.org/faq/utf_bom.html#gen6 http://www.unicode.org/versions/Unicode6.2.0/ch03.pdf#G28070 > You could build a table of interesting byte offsets when you construct > the stream. So you would augment the file with an index file. This is certainly not a general solution as you do not always have the option to transport that extra data with the file. Plus, aligning offsets while writing might prove as difficult as when reading (e.g. because of buffering). > You could embed binary counts in bytes/chars at the head of phrases. > You build and take the stream apart with ByteArrayStreams. That's no longer a text document. robert -- remember.guy do |as, often| as.you_can - without end http://blog.rubybestpractices.com/