27.01.2013 22:47, Max Kellermann пишет: > You have described that a character may be represented by 4 bytes, but > that does not really answer my question. That upper limit would apply > if a string holding MPD_PATH_MAX 4-byte characters must be > represented.
OK. Let me explain with more details. MPD does not know actual encoding of the path names at build time. This is a runtime option expressed in mpd.conf. MPD needs to convert string between UTF-8 and real path name encoding. OS imposes some limit on path names in bytes. This is expressed by MPD_PATH_MAX. Suppose there is encoding "foo" and path names are encoded with it. Encoding "foo" uses 1-byte to represent some code points that occupy 4 bytes in UTF-8. > > When will that happen? Suppose there is a path name that has MPD_PATH_MAX - 1 code points. Each code point in that path name is encoded in "foo" with 1 byte, but those code points occupy 4 bytes in UTF-8. This means it would occupy MPD_PATH_MAX - 1 bytes as path name (without nul-terminator). Also this means after converting to UTF-8 it would occupy (MPD_PATH_MAX - 1) * 4 (without nul-terminator). > > What is the real meaning of this MPD_PATH_MAX_UTF8 value, in general? > Is it an upper limit imposed by MPD? By the operating system? What > will it be used for? This is approximate (upper bound) limit of number of bytes that are required to represent path name in UTF-8 regardless of what file system encoding is configured at runtime plus one byte for nul-terminator. -- Denis ------------------------------------------------------------------------------ Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft MVPs and experts. ON SALE this month only -- learn more at: http://p.sf.net/sfu/learnnow-d2d _______________________________________________ Musicpd-dev-team mailing list Musicpd-dev-team@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/musicpd-dev-team
