Add a Mach-O decoder to the QPluginLoader

We already had an ELF decoder, which helped us greatly to find the
metadata and that catches most Unix systems (Solaris, QNX, HP-UXi, and
all of the free Unixes). On other Unix systems, aside from Mac OS X,
we simply scanned the entire file for the signature. On Windows, even
without a COFF-PE decoder, we use a LoadLibrary trick to load the
plugin without loading the dependent libraries. In most cases, that
works.

Unfortunately, on Mac OS X we didn't have a decoder and nor could we
do the file scan: because Mac OS X binaries could be fat binaries, we
wouldn't know which architecture's signature we had found.

No more. This adds a full Mach-O decoder to QtCore. It is also capable
of finding the boundaries of the architecture's binary, but that
functionality is disabled since all Qt 5 plugins have plugin metadata
sections.

Change-Id: I2d5c04c5ecf024864b8a43f31ab6b7e6c5eae9ce
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Simplify the QLibrary plugin-detection code

The reason why the scanning of files was restricted to Unix is lost in
history. My guess is that it was added *because* on Unix you couldn't
do the LoadLibrary trick to load without dependencies. That is, it
makes no comparison to whether scanning is faster than LoadLibrary.

So assume that scanning is faster, especially now that we have memory
mapping in QFile (it wasn't there in Qt 4.0).

This simplifies greatly the codebase because we no longer need to try
to load and later unload the library to check whether it is a Qt
plugin or not, nor deal with Windows non-C++ exceptions. Just scan on
all platforms.

Change-Id: If269e009bfb9920805ca1aa6c2b66aacdd5b26e9
Reviewed-by: Morten Johan Sørvig <morten.sorvig@digia.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
Make the Mach-O size checking a little more robust

It's not necessary to check at every point if we know the minimum file
size: it must contain at least the header, one segment (__TEXT) and one
section (qtmetadata). Most files have more than one segment and more
than one loader command, so this check does not mean we can eliminate
the checks further down.

Also be more resilient against corruptions in the header data: check not
only the additions, but the values themselves. For example, an offset +
size addition could be smaller than the file size when the addition
overflows in 32-bit. Another thing is that the cmdsize fields could be
corrupt too.

Change-Id: I7968a769c1cbe9150270c91823cafc4f8f833876
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
QUrl: Add an "appendingTo" parameter to QUrl::appendFragment

Will be needed in a future commit.

Change-Id: Ia5f384442d25d277e7582a20d1c37da4303c64c3
Reviewed-by: David Faure (KDE) <faure@kde.org>
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@digia.com>
Fix QUrl parsing of IPv6 hosts with encoded colons

Registered names and IP addresses can only contain unreserved
characters (letters, digits, dots, hyphens, underscores) and the
colon, which is a gen-delim. For registered names and IPv4 addresses,
we can simply use the default config -- if anything that remains
percent-encoded, it means it's not a valid hostname anyway.

For IPv6, we just need to decode the colon.

Change-Id: If8083d47f6e5375f760e7a6c59631c89e4da8378
Reviewed-by: David Faure (KDE) <faure@kde.org>
Fix IPvFuture use in QUrl

We have no idea what it might contain, but test it anyway to make sure
it works. Turns out there were a few bugs the unit tests have now
caught.

Change-Id: I0a6c868365feec31c2360b3c341c8ca6944f4352
Reviewed-by: David Faure (KDE) <faure@kde.org>
Make the URL Recode function to fix bad input in FullyDecoded mode too

So far, this function hasn't been used for input coming in from the
user, so it wasn't necessary. But we may want to do it, or we may
already be doing it accidentally somewhere that isn't triggering the
failed assertions during unit testing.

So let's be on the safe side and allow it. And test it too.

Change-Id: Ib63addd8da468ad6908278d07a4829f1bdc26a07
Reviewed-by: David Faure (KDE) <faure@kde.org>
QUrl: Uppercase the version number in IPvFuture

We don't know what it might be used for. The RFC for URI says it's an
HEXDIG, and since we uppercase all other HEXDIGs already (in
percent-encodings...).

Change-Id: I56d0a81315576dd98eaa2657c0307d79332543a5
Reviewed-by: David Faure (KDE) <faure@kde.org>
QUrl: Make sure we don't return a dangling pointer from parseIpFuture

Change-Id: I54bf8d0fe72b8db8d158899ee4525c8d067272b8
Reviewed-by: David Faure (KDE) <faure@kde.org>
Make QIPAddress::parseIp6 return the first bad character

In case of undetermined error, returns end.

Change-Id: Ic5d16bab5fc56ad24f19da25f73f9b844ce11d3f
Reviewed-by: David Faure (KDE) <faure@kde.org>
Make QUrl store the first bad IPv6 character in the error string

Change-Id: I9a0a521ff5c3188ba6f862e2b91369cb61787359
Reviewed-by: David Faure (KDE) <faure@kde.org>
QUrl: add fileName() method. Complements QUrl::RemoveFilename.

Change-Id: Ieda43364214c3b7aee43040e176e29ad48c14271
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
QUrl: let StripTrailingSlash remove multiple trailing slashes

Change-Id: Ic4c8f70bb729630d9110ed6766dd9e40f9ab4d80
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>