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-While some other iconv(3) implementations - like FreeBSD iconv(3) - choose
-the "many small shared libraries" and dlopen(3) approach, this implementation
-packs everything into a single shared library. Here is a comparison of the
-two designs.
-
-* Run-time efficiency
-  1. A dlopen() based approach needs a cache of loaded shared libraries.
-  Otherwise, every iconv_open() call will result in a call to dlopen()
-  and thus to file system related system calls - which is prohibitive
-  because some applications use the iconv_open/iconv/iconv_close sequence
-  for every single filename, string, or piece of text.
-  2. In terms of virtual memory use, both approaches are on par. Being shared
-  libraries, the tables are shared between any processes that use them.
-  And because of the demand loading used by Unix systems (and because libiconv
-  does not have initialization functions), only those parts of the tables
-  which are needed (typically very few kilobytes) will be read from disk and
-  paged into main memory.
-  3. Even with a cache of loaded shared libraries, the dlopen() based approach
-  makes more system calls, because it has to load one or two shared libraries
-  for every encoding in use.
-
-* Total size
-  In the dlopen(3) approach, every shared library has a symbol table and
-  relocation offset. All together, FreeBSD iconv installs more than 200 shared
-  libraries with a total size of 2.3 MB. Whereas libiconv installs 0.45 MB.
-
-* Extensibility
-  The dlopen(3) approach is good for guaranteeing extensibility if the iconv
-  implementation is distributed without source. (Or when, as in glibc, you
-  cannot rebuild iconv without rebuilding your libc, thus possibly
-  destabilizing your system.)
-  The libiconv package achieves extensibility through the LGPL license:
-  Every user has access to the source of the package and can extend and
-  replace just libiconv.so.
-  The places which have to be modified when a new encoding is added are as
-  follows: add an #include statement in iconv.c, add an entry in the table in
-  iconv.c, and of course, update the README and iconv_open.3 manual page.
-
-* Use within other packages
-  If you want to incorporate an iconv implementation into another package
-  (such as a mail user agent or web browser), the single library approach
-  is easier, because:
-  1. In the shared library approach you have to provide the right directory
-  prefix which will be used at run time.
-  2. Incorporating iconv as a static library into the executable is easy -
-  it won't need dynamic loading. (This assumes that your package is under
-  the LGPL or GPL license.)
-
-
-All conversions go through Unicode. This is possible because most of the
-world's characters have already been allocated in the Unicode standard.
-Therefore we have for each encoding two functions:
-- For conversion from the encoding to Unicode, a function called xxx_mbtowc.
-- For conversion from Unicode to the encoding, a function called xxx_wctomb,
-  and for stateful encodings, a function called xxx_reset which returns to
-  the initial shift state.
-
-
-All our functions operate on a single Unicode character at a time. This is
-obviously less efficient than operating on an entire buffer of characters at
-a time, but it makes the coding considerably easier and less bug-prone. Those
-who wish best performance should install the Real Thing (TM): GNU libc 2.1
-or newer.
-