Drop the required GLib version from 2.16 to 2.12, because many current
systems still don't have GLib 2.16.  This requires several new
compatibility functions in glib_compat.h.

When the connection is lost while buffering, the CURL input plugin may
enter an endless loop, because it does not check the EOF condition.
This patch makes fill_buffer() return success only if there's at least
one buffer, which is enough of a check.x

Accidently, MPD has been using several GLib 2.16 functions for a
while, and nobody noticed yet.  To simplify the code base, let's bump
the minimum GLib version for MPD to 2.16.  That version is old enough,
and it's reasonable to expect users to have it.

The "off_t" type may change when you enable or disable large file
support on 32 bit platforms.  This caused severe ABI problems within
MPD when we enabled LFS for the first time: two sources included
config.h and sys/types.h in different order, and had different off_t
sizes - leading to memory corruption because of ABI incompatibility.
This patch attempts to get rid of all public "off_t" uses: it removes
"off_t" from the input_stream ABI/API, and switches to GLib's 64 bit
"goffset" type.  This may hurt 32 bit embedded platforms a tiny bit,
but that's not even measurable.

When a received chunk of data has only icy-metadata, there was no
usable data left for input_curl_read() to return, and thus it returned
0 bytes.  "0" however is a special value for "end of file" or
"error".  This patch makes input_curl_read() read more data from the
socket, until the read request can be fulfilled (or until there's
really EOF).

strcasecmp() is locale dependent, making it a bad choice for internal
string comparisons.

The old global settings "http_proxy_host", "http_proxy_port",
"http_proxy_user" and "http_proxy_password" continue to work.

This updates the copyright header to all be the same, which is
pretty much an update of where to mail request for a copy of the GPL
and the years of the MPD project. This also puts all committers under
'The Music Player Project' umbrella. These entries should go
individually in the AUTHORS file, for consistancy.

The GLIB_CHECK_VERSION() macro was used improperly, which broke build
on GLib < 2.14.  Add a "!" for negation.

Allow input plugins to configure with an "input" block in mpd.conf.
Also allow the user to disable a plugin completely.

Instead of hard-coding the plugin global initialization in
input_stream_global_init(), make it walk the plugin list and
initialize all plugins.

Create a sub directory for input plugins.

Start to separate private from public input_stream API.

Use GLIB_CHECK_VERSION() instead of manually checking
GLIB_MAJOR_VERSION, ...

Define G_LOG_DOMAIN.

This way, plugins can manipulate the plugin pointer during open().

config_get_string() is easier to use than config_get_param() because
it unpacks the config_param struct.

Renamed functions, types, variables.

Calling input_curl_select() after EOF has been reached causes an
assertion failure.  This can happen if the HTTP response is empty.
Check c->eof before calling input_curl_select().

Set the "ready" flag for empty resources.

To check for early connect failures, call curl_multi_info_read() in
the constructor input_curl_open().  This fixes an assertion failure.

g_queue_clear() was introduced in GLib 2.14.  Add a macro hack for
older GLib versions to emulate it.

If http_proxy_{host, port, user, password} are provided in mpd.conf
they are not passed on to libcurl. As a result mpd cannot stream from
behind an http proxy.

The attached patch `http_proxy.patch` makes the relevant calls to
curl_easy_setopt(...) for all proxy configuration parameters, but is
only tested for host and port.

When decoder_run_song() (decoder_thread.c) waits for the input stream
to become ready, it did that in a busy loop.  Add a select() call to
input_curl_buffer() during connect/handshake (i.e. before the first
chunk of body data was received), to let the CPU relax.

Get rid of the non-portable Linux list library, part II.

Fix a typo in the icy-metadata patch.

The tag() method reads a tag from the stream.  This replaces the
meta_name and meta_title attributes.

Follow HTTP redirects, but no more than 5.

Send "Music Player Daemon " + VERSION as the User-Agent request
header.

input_curl.c does not support parsing shoutcast metadata yet.  Disable
the "Icy-Metadata" header for now, since it may cause corruptions in
the stream.

If the caller attempts to seek only a few bytes forward, chances are
good that the offset is already in the buffer.  In this case, simply
fast-forward the buffer.

Added some assertions.

If someone calls seek() with an invalid (negative) offset, the curl
implementation of that method returned false, but left this invalid
offset in input_stream.offset.  Move the calculation to a temporary
variable.

HTTP servers respond with "416 Requested Range Not Satisfiable" when a
client attempts to seek to the end of the file.  Catch this special
case in input_curl_seek().  This fixes a glitch in the ogg vorbis
decoder plugin.

Since we are using curl_multi_info_read() / CURLMSG_DONE for detecting
end-of-response, we can remove all running_handles==0 checks.  For
some reason, that has never worked correctly.