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539 lines
14 KiB
539 lines
14 KiB
/****************************************************************************
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**
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** Implementation of QComLibrary class
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**
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** Copyright (C) 2001-2008 Trolltech ASA. All rights reserved.
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**
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** This file is part of the tools module of the Qt GUI Toolkit.
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**
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** This file may be used under the terms of the GNU General
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** Public License versions 2.0 or 3.0 as published by the Free
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** Software Foundation and appearing in the files LICENSE.GPL2
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** and LICENSE.GPL3 included in the packaging of this file.
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** Alternatively you may (at your option) use any later version
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** of the GNU General Public License if such license has been
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** publicly approved by Trolltech ASA (or its successors, if any)
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** and the KDE Free Qt Foundation.
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**
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** Please review the following information to ensure GNU General
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** Public Licensing requirements will be met:
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** http://trolltech.com/products/qt/licenses/licensing/opensource/.
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** If you are unsure which license is appropriate for your use, please
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** review the following information:
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** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
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** or contact the sales department at sales@trolltech.com.
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**
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** This file may be used under the terms of the Q Public License as
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** defined by Trolltech ASA and appearing in the file LICENSE.QPL
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** included in the packaging of this file. Licensees holding valid Qt
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** Commercial licenses may use this file in accordance with the Qt
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** Commercial License Agreement provided with the Software.
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**
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** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
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** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
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** herein.
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**
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**********************************************************************/
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#include "qcomlibrary_p.h"
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#ifndef QT_NO_COMPONENT
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#include <qapplication.h>
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#include <qsettings.h>
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#include <qfileinfo.h>
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#include <qdatetime.h>
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#include <qcleanuphandler.h>
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#ifndef NO_ERRNO_H
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#include <errno.h>
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#endif // NO_ERROR_H
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#ifdef QT_THREAD_SUPPORT
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# include "qmutexpool_p.h"
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#endif // QT_THREAD_SUPPORT
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#ifndef QT_DEBUG_COMPONENT
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# if defined(QT_DEBUG)
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# define QT_DEBUG_COMPONENT 1
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# endif
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#endif
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QComLibrary::QComLibrary( const QString &filename )
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: QLibrary( filename ), entry( 0 ), libiface( 0 ), qt_version( 0 )
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{
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}
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QComLibrary::~QComLibrary()
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{
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if ( autoUnload() )
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unload();
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if ( libiface )
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libiface->release();
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if ( entry )
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entry->release();
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}
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bool QComLibrary::unload()
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{
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int refs = entry ? entry->release() : 0;
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entry = 0;
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if (refs || !libiface)
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return FALSE;
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libiface->cleanup();
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if ( !libiface->canUnload() )
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return FALSE;
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libiface->release();
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libiface = 0;
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return QLibrary::unload();
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}
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static bool qt_verify( const QString& library, uint version, uint flags,
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const QCString &key, bool warn )
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{
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uint our_flags = 1;
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#if defined(QT_THREAD_SUPPORT)
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our_flags |= 2;
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#endif
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if ( (flags & 1) == 0 ) {
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if ( warn )
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qWarning( "Conflict in %s:\n"
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" Plugin cannot be queried successfully!",
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(const char*) QFile::encodeName(library) );
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} else if ( ( version > QT_VERSION ) ||
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( ( QT_VERSION & 0xff0000 ) > ( version & 0xff0000 ) ) ) {
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if ( warn )
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qWarning( "Conflict in %s:\n"
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" Plugin uses incompatible Qt library (%d.%d.%d)!",
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(const char*) QFile::encodeName(library),
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(version&0xff0000) >> 16, (version&0xff00) >> 8, version&0xff );
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} else if ( (flags & 2) != (our_flags & 2) ) {
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if ( warn )
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qWarning( "Conflict in %s:\n"
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" Plugin uses %s Qt library!",
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(const char*) QFile::encodeName(library),
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(flags & 2) ? "multi threaded" : "single threaded" );
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} else if ( key != QT_BUILD_KEY ) {
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if ( warn )
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qWarning( "Conflict in %s:\n"
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" Plugin uses incompatible Qt library!\n"
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" expected build key \"%s\", got \"%s\".",
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(const char*) QFile::encodeName(library),
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QT_BUILD_KEY,
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key.isEmpty() ? "<null>" : (const char *) key );
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} else {
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return TRUE;
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}
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return FALSE;
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}
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struct qt_token_info
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{
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qt_token_info( const char *f, const ulong fc )
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: fields( f ), field_count( fc ), results( fc ), lengths( fc )
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{
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results.fill( 0 );
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lengths.fill( 0 );
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}
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const char *fields;
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const ulong field_count;
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QMemArray<const char *> results;
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QMemArray<ulong> lengths;
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};
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/*
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return values:
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1 parse ok
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0 eos
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-1 parse error
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*/
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static int qt_tokenize( const char *s, ulong s_len, ulong *advance,
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const qt_token_info &token_info )
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{
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ulong pos = 0, field = 0, fieldlen = 0;
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char current;
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int ret = -1;
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*advance = 0;
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for (;;) {
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current = s[ pos ];
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// next char
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++pos;
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++fieldlen;
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++*advance;
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if ( ! current || pos == s_len + 1 ) {
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// save result
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token_info.results[ (int)field ] = s;
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token_info.lengths[ (int)field ] = fieldlen - 1;
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// end of string
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ret = 0;
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break;
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}
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if ( current == token_info.fields[ field ] ) {
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// save result
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token_info.results[ (int)field ] = s;
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token_info.lengths[ (int)field ] = fieldlen - 1;
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// end of field
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fieldlen = 0;
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++field;
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if ( field == token_info.field_count - 1 ) {
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// parse ok
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ret = 1;
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}
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if ( field == token_info.field_count ) {
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// done parsing
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break;
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}
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// reset string and its length
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s = s + pos;
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s_len -= pos;
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pos = 0;
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}
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}
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return ret;
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}
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/*
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returns TRUE if the string s was correctly parsed, FALSE otherwise.
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*/
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static bool qt_parse_pattern( const char *s, uint *version, uint *flags,
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QCString *key )
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{
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bool ret = TRUE;
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qt_token_info pinfo("=\n", 2);
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int parse;
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ulong at = 0, advance, parselen = qstrlen( s );
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do {
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parse = qt_tokenize( s + at, parselen, &advance, pinfo );
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if ( parse == -1 ) {
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ret = FALSE;
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break;
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}
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at += advance;
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parselen -= advance;
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if ( qstrncmp( "version", pinfo.results[ 0 ], pinfo.lengths[ 0 ] ) == 0 ) {
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// parse version string
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qt_token_info pinfo2("..-", 3);
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if ( qt_tokenize( pinfo.results[ 1 ], pinfo.lengths[ 1 ],
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&advance, pinfo2 ) != -1 ) {
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QCString m( pinfo2.results[ 0 ], pinfo2.lengths[ 0 ] + 1 );
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QCString n( pinfo2.results[ 1 ], pinfo2.lengths[ 1 ] + 1 );
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QCString p( pinfo2.results[ 2 ], pinfo2.lengths[ 2 ] + 1 );
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*version = (m.toUInt() << 16) | (n.toUInt() << 8) | p.toUInt();
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} else {
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ret = FALSE;
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break;
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}
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} else if ( qstrncmp( "flags", pinfo.results[ 0 ], pinfo.lengths[ 0 ] ) == 0 ) {
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// parse flags string
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char ch;
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*flags = 0;
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ulong p = 0, c = 0, bit = 0;
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while ( p < pinfo.lengths[ 1 ] ) {
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ch = pinfo.results[ 1 ][ p ];
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bit = pinfo.lengths[ 1 ] - p - 1;
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c = 1 << bit;
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if ( ch == '1' ) {
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*flags |= c;
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} else if ( ch != '0' ) {
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ret = FALSE;
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break;
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}
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++p;
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}
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} else if ( qstrncmp( "buildkey", pinfo.results[ 0 ],
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pinfo.lengths[ 0 ] ) == 0 ){
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// save buildkey
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*key = QCString( pinfo.results[ 1 ], pinfo.lengths[ 1 ] + 1 );
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}
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} while ( parse == 1 && parselen > 0 );
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return ret;
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}
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#if defined(Q_OS_UNIX)
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#if defined(Q_OS_FREEBSD) || defined(Q_OS_LINUX)
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# define USE_MMAP
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# include <sys/types.h>
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# include <sys/mman.h>
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#endif // Q_OS_FREEBSD || Q_OS_LINUX
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static long qt_find_pattern( const char *s, ulong s_len,
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const char *pattern, ulong p_len )
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{
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/*
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this uses the same algorithm as QString::findRev...
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we search from the end of the file because on the supported
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systems, the read-only data/text segments are placed at the end
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of the file. HOWEVER, when building with debugging enabled, all
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the debug symbols are placed AFTER the data/text segments.
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what does this mean? when building in release mode, the search
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is fast because the data we are looking for is at the end of the
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file... when building in debug mode, the search is slower
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because we have to skip over all the debugging symbols first
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*/
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if ( ! s || ! pattern || p_len > s_len ) return -1;
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ulong i, hs = 0, hp = 0, delta = s_len - p_len;
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for (i = 0; i < p_len; ++i ) {
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hs += s[delta + i];
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hp += pattern[i];
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}
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i = delta;
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for (;;) {
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if ( hs == hp && qstrncmp( s + i, pattern, p_len ) == 0 )
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return i;
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if ( i == 0 )
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break;
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--i;
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hs -= s[i + p_len];
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hs += s[i];
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}
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return -1;
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}
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/*
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This opens the specified library, mmaps it into memory, and searches
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for the QT_UCM_VERIFICATION_DATA. The advantage of this approach is that
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we can get the verification data without have to actually load the library.
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This lets us detect mismatches more safely.
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Returns FALSE if version/flags/key information is not present, or if the
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information could not be read.
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Returns TRUE if version/flags/key information is present and succesfully read.
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*/
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static bool qt_unix_query( const QString &library, uint *version, uint *flags,
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QCString *key )
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{
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QFile file( library );
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if (! file.open( IO_ReadOnly ) ) {
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qWarning( "%s: %s", (const char*) QFile::encodeName(library),
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strerror( errno ) );
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return FALSE;
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}
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QByteArray data;
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char *filedata = 0;
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ulong fdlen = 0;
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#ifdef USE_MMAP
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char *mapaddr = 0;
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size_t maplen = file.size();
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mapaddr = (char *) mmap( mapaddr, maplen, PROT_READ, MAP_PRIVATE, file.handle(), 0 );
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if ( mapaddr != MAP_FAILED ) {
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// mmap succeeded
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filedata = mapaddr;
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fdlen = maplen;
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} else {
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// mmap failed
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qWarning( "mmap: %s", strerror( errno ) );
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#endif // USE_MMAP
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// try reading the data into memory instead
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data = file.readAll();
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filedata = data.data();
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fdlen = data.size();
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#ifdef USE_MMAP
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}
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#endif // USE_MMAP
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// verify that the pattern is present in the plugin
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const char *pattern = "pattern=QT_UCM_VERIFICATION_DATA";
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const ulong plen = qstrlen( pattern );
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long pos = qt_find_pattern( filedata, fdlen, pattern, plen );
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bool ret = FALSE;
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if ( pos >= 0 ) {
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ret = qt_parse_pattern( filedata + pos, version, flags, key );
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}
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#ifdef USE_MMAP
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if ( mapaddr != MAP_FAILED && munmap(mapaddr, maplen) != 0 ) {
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qWarning( "munmap: %s", strerror( errno ) );
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}
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#endif // USE_MMAP
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file.close();
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return ret;
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}
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#endif // Q_OS_UNIX
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static QSettings *cache = 0;
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static QSingleCleanupHandler<QSettings> cleanup_cache;
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void QComLibrary::createInstanceInternal()
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{
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if ( library().isEmpty() )
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return;
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QFileInfo fileinfo( library() );
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QString lastModified = fileinfo.lastModified().toString(Qt::ISODate);
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QString regkey = QString("/Qt Plugins %1.%2/%3")
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.arg( ( QT_VERSION & 0xff0000 ) >> 16 )
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.arg( ( QT_VERSION & 0xff00 ) >> 8 )
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.arg( library() );
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QStringList reg;
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uint flags = 0;
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QCString key;
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bool query_done = FALSE;
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bool warn_mismatch = TRUE;
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#ifdef QT_THREAD_SUPPORT
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QMutexLocker locker( qt_global_mutexpool ?
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qt_global_mutexpool->get( &cache ) : 0 );
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#endif // QT_THREAD_SUPPORT
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if ( ! cache ) {
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cache = new QSettings;
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cache->insertSearchPath( QSettings::Windows, "/Trolltech" );
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cleanup_cache.set( &cache );
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}
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reg = cache->readListEntry( regkey );
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if ( reg.count() == 4 ) {
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// check timestamp
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if ( lastModified == reg[3] ) {
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qt_version = reg[0].toUInt(0, 16);
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flags = reg[1].toUInt(0, 16);
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key = reg[2].latin1();
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query_done = TRUE;
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warn_mismatch = FALSE;
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}
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}
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#if defined(Q_OS_UNIX)
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if ( ! query_done ) {
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// get the query information directly from the plugin without loading
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if ( qt_unix_query( library(), &qt_version, &flags, &key ) ) {
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// info read succesfully from library
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query_done = TRUE;
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}
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}
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#else // !Q_OS_UNIX
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if ( ! query_done ) {
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// get the query information by loading the plugin
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if ( !isLoaded() ) {
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Q_ASSERT( entry == 0 );
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if ( !load() )
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return;
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}
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# ifdef Q_CC_BOR
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typedef const char * __stdcall (*UCMQueryVerificationDataProc)();
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# else
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typedef const char * (*UCMQueryVerificationDataProc)();
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# endif
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UCMQueryVerificationDataProc ucmQueryVerificationdataProc;
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ucmQueryVerificationdataProc =
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(UCMQueryVerificationDataProc) resolve( "qt_ucm_query_verification_data" );
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if ( !ucmQueryVerificationdataProc ||
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!qt_parse_pattern( ucmQueryVerificationdataProc(),
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&qt_version, &flags, &key ) ) {
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qt_version = flags = 0;
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key = "unknown";
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} else {
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query_done = TRUE;
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}
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}
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#endif // Q_OS_UNIX
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QStringList queried;
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queried << QString::number( qt_version,16 )
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<< QString::number( flags, 16 )
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<< key
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<< lastModified;
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if ( queried != reg ) {
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cache->writeEntry( regkey, queried );
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// delete the cache, which forces the settings to be written
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delete cache;
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cache = 0;
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}
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if ( ! query_done ) {
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if ( warn_mismatch ) {
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qWarning( "Conflict in %s:\n Plugin cannot be queried successfully!",
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(const char*) QFile::encodeName( library() ) );
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}
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unload();
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return;
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}
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if ( ! qt_verify( library(), qt_version, flags, key, warn_mismatch ) ) {
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unload();
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return;
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} else if ( !isLoaded() ) {
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Q_ASSERT( entry == 0 );
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if ( !load() )
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return;
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}
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#ifdef Q_CC_BOR
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typedef QUnknownInterface* __stdcall (*UCMInstanceProc)();
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#else
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typedef QUnknownInterface* (*UCMInstanceProc)();
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#endif
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UCMInstanceProc ucmInstanceProc;
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ucmInstanceProc = (UCMInstanceProc) resolve( "ucm_instantiate" );
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#if defined(QT_DEBUG_COMPONENT)
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if ( !ucmInstanceProc )
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qWarning( "%s: Not a UCOM library.", (const char*) QFile::encodeName(library()) );
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#endif
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entry = ucmInstanceProc ? ucmInstanceProc() : 0;
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if ( entry ) {
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if ( entry->queryInterface( IID_QLibrary, (QUnknownInterface**)&libiface ) == QS_OK ) {
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if ( libiface && !libiface->init() ) {
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libiface->release();
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libiface = 0;
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unload();
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return;
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}
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}
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} else {
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#if defined(QT_DEBUG_COMPONENT)
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qWarning( "%s: No exported component provided.", (const char*) QFile::encodeName(library()) );
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#endif
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unload();
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}
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}
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QRESULT QComLibrary::queryInterface( const QUuid& request, QUnknownInterface** iface )
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{
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if ( !entry )
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createInstanceInternal();
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return entry ? entry->queryInterface( request, iface ) : QE_NOCOMPONENT;
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}
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uint QComLibrary::qtVersion()
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{
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if ( !entry )
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createInstanceInternal();
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return entry ? qt_version : 0;
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}
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#endif // QT_NO_COMPONENT
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