/****************************************************************************
** $Id: qurl.cpp 8 2005-11-16 19:36:46Z dmik $
**
** Implementation of QUrl class
**
** Created : 950429
**
** Copyright (C) 1992-2000 Trolltech AS.  All rights reserved.
**
** This file is part of the kernel module of the Qt GUI Toolkit.
**
** This file may be distributed under the terms of the Q Public License
** as defined by Trolltech AS of Norway and appearing in the file
** LICENSE.QPL included in the packaging of this file.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** Licensees holding valid Qt Enterprise Edition or Qt Professional Edition
** licenses may use this file in accordance with the Qt Commercial License
** Agreement provided with the Software.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
**   information about Qt Commercial License Agreements.
** See http://www.trolltech.com/qpl/ for QPL licensing information.
** See http://www.trolltech.com/gpl/ for GPL licensing information.
**
** Contact info@trolltech.com if any conditions of this licensing are
** not clear to you.
**
**********************************************************************/

#include "qurl.h"

#ifndef QT_NO_URL

#include "qdir.h"

#include <stdlib.h>

class QUrlPrivate
{
public:
    QString protocol;
    QString user;
    QString pass;
    QString host;
    QString path, cleanPath;
    QString refEncoded;
    QString queryEncoded;
    bool isValid;
    int port;
    bool cleanPathDirty;
};

/*!
    Replaces backslashes with slashes and removes multiple occurrences
    of slashes or backslashes if \c allowMultiple is FALSE.
*/

static void slashify( QString& s, bool allowMultiple = TRUE )
{
    bool justHadSlash = FALSE;
    for ( int i = 0; i < (int)s.length(); i++ ) {
	if ( !allowMultiple && justHadSlash &&
	     ( s[ i ] == '/' || s[ i ] == '\\' ) ) {
	    s.remove( i, 1 );
	    --i;
	    continue;
	}
	if ( s[ i ] == '\\' )
	    s[ i ] = '/';
#if defined (Q_WS_MAC9)
	if ( s[ i ] == ':' && (i == (int)s.length()-1 || s[ i + 1 ] != '/' ) ) //mac colon's go away, unless after a protocol
		s[ i ] = '/';
#endif
	if ( s[ i ] == '/' )
	    justHadSlash = TRUE;
	else
	    justHadSlash = FALSE;
    }
}



/*!
    \class QUrl qurl.h

    \brief The QUrl class provides a URL parser and simplifies working with URLs.
\if defined(commercial)
    It is part of the <a href="commercialeditions.html">Qt Enterprise Edition</a>.
\endif

    \ingroup io
    \ingroup misc
    \mainclass

    \module network

    The QUrl class is provided for simple work with URLs. It can
    parse, decode, encode, etc.

    QUrl works with the decoded path and encoded query in turn.

    Example:

    <tt>http://www.trolltech.com:80/cgi-bin/test%20me.pl?cmd=Hello%20you</tt>

    \table
    \header \i Function	    \i Returns
    \row \i \l protocol()   \i "http"
    \row \i \l host()	    \i "www.trolltech.com"
    \row \i \l port()	    \i 80
    \row \i \l path()	    \i "/cgi-bin/test&nbsp;me.pl"
    \row \i \l fileName()   \i "test&nbsp;me.pl"
    \row \i \l query()	    \i "cmd=Hello%20you"
    \endtable

    Example:

    <tt>http://doc.trolltech.com/qdockarea.html#lines</tt>

    \table
    \header \i Function	    \i Returns
    \row \i \l protocol()   \i "http"
    \row \i \l host()	    \i "doc.trolltech.com"
    \row \i \l fileName()   \i "qdockarea.html"
    \row \i \l ref()	    \i "lines"
    \endtable

    The individual parts of a URL can be set with setProtocol(),
    setHost(), setPort(), setPath(), setFileName(), setRef() and
    setQuery(). A URL could contain, for example, an ftp address which
    requires a user name and password; these can be set with setUser()
    and setPassword().

    Because path is always encoded internally you must not use "%00"
    in the path, although this is okay (but not recommended) for the
    query.

    QUrl is normally used like this:

    \code
    QUrl url( "http://www.trolltech.com" );
    // or
    QUrl url( "file:/home/myself/Mail", "Inbox" );
    \endcode

    You can then access and manipulate the various parts of the URL.

    To make it easy to work with QUrls and QStrings, QUrl implements
    the necessary cast and assignment operators so you can do
    following:

    \code
    QUrl url( "http://www.trolltech.com" );
    QString s = url;
    // or
    QString s( "http://www.trolltech.com" );
    QUrl url( s );
    \endcode

    Use the static functions, encode() and decode() to encode or
    decode a URL in a string. (They operate on the string in-place.)
    The isRelativeUrl() static function returns TRUE if the given
    string is a relative URL.

    If you want to use a URL to work on a hierarchical structure (e.g.
    a local or remote filesystem), you might want to use the subclass
    QUrlOperator.

    \sa QUrlOperator
*/


/*!
    Constructs an empty URL that is invalid.
*/

QUrl::QUrl()
{
    d = new QUrlPrivate;
    d->isValid = FALSE;
    d->port = -1;
    d->cleanPathDirty = TRUE;
}

/*!
    Constructs a URL by parsing the string \a url.

    If you pass a string like "/home/qt", the "file" protocol is
    assumed.
*/

QUrl::QUrl( const QString& url )
{
    d = new QUrlPrivate;
    d->protocol = "file";
    d->port = -1;
    parse( url );
}

/*!
    Copy constructor. Copies the data of \a url.
*/

QUrl::QUrl( const QUrl& url )
{
    d = new QUrlPrivate;
    *d = *url.d;
}

/*!
    Returns TRUE if \a url is relative; otherwise returns FALSE.
*/

bool QUrl::isRelativeUrl( const QString &url )
{
    int colon = url.find( ":" );
    int slash = url.find( "/" );

    return ( slash != 0 && ( colon == -1 || ( slash != -1 && colon > slash ) ) );
}

/*!
    Constructs an URL taking \a url as the base (context) and
    \a relUrl as a relative URL to \a url. If \a relUrl is not relative,
    \a relUrl is taken as the new URL.

    For example, the path of
    \code
    QUrl url( "ftp://ftp.trolltech.com/qt/source", "qt-2.1.0.tar.gz" );
    \endcode
    will be "/qt/srource/qt-2.1.0.tar.gz".

    On the other hand,
    \code
    QUrl url( "ftp://ftp.trolltech.com/qt/source", "/usr/local" );
    \endcode
    will result in a new URL, "ftp://ftp.trolltech.com/usr/local",
    because "/usr/local" isn't relative.

    Similarly,
    \code
    QUrl url( "ftp://ftp.trolltech.com/qt/source", "file:/usr/local" );
    \endcode
    will result in a new URL, with "/usr/local" as the path
    and "file" as the protocol.

    Normally it is expected that the path of \a url points to a
    directory, even if the path has no slash at the end. But if you
    want the constructor to handle the last part of the path as a file
    name if there is no slash at the end, and to let it be replaced by
    the file name of \a relUrl (if it contains one), set \a checkSlash
    to TRUE.
*/

QUrl::QUrl( const QUrl& url, const QString& relUrl, bool checkSlash )
{
    d = new QUrlPrivate;
    QString rel = relUrl;
    slashify( rel );

    QUrl urlTmp( url );
    if ( !urlTmp.isValid() ) {
	urlTmp.reset();
    }
    if ( isRelativeUrl( rel ) ) {
	if ( rel[ 0 ] == '#' ) {
	    *this = urlTmp;
	    rel.remove( (uint)0, 1 );
	    decode( rel );
	    setRef( rel );
	} else if ( rel[ 0 ] == '?' ) {
	    *this = urlTmp;
	    rel.remove( (uint)0, 1 );
	    setQuery( rel );
	} else {
	    decode( rel );
	    *this = urlTmp;
	    setRef( QString::null );
	    if ( checkSlash && d->cleanPath[(int)path().length()-1] != '/' ) {
		if ( isRelativeUrl( path() ) )
		    setEncodedPathAndQuery( rel );
		else
		    setFileName( rel );
	    } else {
		QString p = urlTmp.path();
		if ( p.isEmpty() ) {
		    // allow URLs like "file:foo"
		    if ( !d->host.isEmpty() && !d->user.isEmpty() && !d->pass.isEmpty() )
			p = "/";
		}
		if ( !p.isEmpty() && p.right(1)!="/" )
		    p += "/";
		p += rel;
		d->path = p;
		d->cleanPathDirty = TRUE;
	    }
	}
    } else {
	if ( rel[ 0 ] == QChar( '/' ) ) {
	    *this = urlTmp;
	    setEncodedPathAndQuery( rel );
	} else {
	    *this = rel;
	}
    }
}

/*!
    Destructor.
*/

QUrl::~QUrl()
{
    delete d;
    d = 0;
}

/*!
    Returns the protocol of the URL. Typically, "file", "http", "ftp",
    etc.

    \sa setProtocol()
*/

QString QUrl::protocol() const
{
    return d->protocol;
}

/*!
    Sets the protocol of the URL to \a protocol. Typically, "file",
    "http", "ftp", etc.

    \sa protocol()
*/

void QUrl::setProtocol( const QString& protocol )
{
    d->protocol = protocol;
    if ( hasHost() )
	d->isValid = TRUE;
}

/*!
    Returns the username of the URL.

    \sa setUser() setPassword()
*/

QString QUrl::user() const
{
    return  d->user;
}

/*!
    Sets the username of the URL to \a user.

    \sa user() setPassword()
*/

void QUrl::setUser( const QString& user )
{
    d->user = user;
}

/*!
    Returns TRUE if the URL contains a username; otherwise returns
    FALSE.

    \sa setUser() setPassword()
*/

bool QUrl::hasUser() const
{
    return !d->user.isEmpty();
}

/*!
    Returns the password of the URL.

    \warning Passwords passed in URLs are normally \e insecure; this
    is due to the mechanism, not because of Qt.

    \sa setPassword() setUser()
*/

QString QUrl::password() const
{
    return d->pass;
}

/*!
    Sets the password of the URL to \a pass.

    \warning Passwords passed in URLs are normally \e insecure; this
    is due to the mechanism, not because of Qt.

    \sa password() setUser()
*/

void QUrl::setPassword( const QString& pass )
{
    d->pass = pass;
}

/*!
    Returns TRUE if the URL contains a password; otherwise returns
    FALSE.

    \warning Passwords passed in URLs are normally \e insecure; this
    is due to the mechanism, not because of Qt.

    \sa setPassword() setUser()
*/

bool QUrl::hasPassword() const
{
    return !d->pass.isEmpty();
}

/*!
    Returns the hostname of the URL.

    \sa setHost() hasHost()
*/

QString QUrl::host() const
{
    return d->host;
}

/*!
    Sets the hostname of the URL to \a host.

    \sa host() hasHost()
*/

void QUrl::setHost( const QString& host )
{
    d->host = host;
    if ( !d->protocol.isNull() && d->protocol != "file" )
	d->isValid = TRUE;
}

/*!
    Returns TRUE if the URL contains a hostname; otherwise returns
    FALSE.

    \sa setHost()
*/

bool QUrl::hasHost() const
{
    return !d->host.isEmpty();
}

/*!
    Returns the port of the URL or -1 if no port has been set.

    \sa setPort()
*/

int QUrl::port() const
{
    return d->port;
}

/*!
    Sets the port of the URL to \a port.

    \sa port()
*/

void QUrl::setPort( int port )
{
    d->port = port;
}

/*!
    Returns TRUE if the URL contains a port; otherwise returns FALSE.

    \sa setPort()
*/

bool QUrl::hasPort() const
{
    return d->port >= 0;
}

/*!
    Sets the path of the URL to \a path.

    \sa path() hasPath()
*/

void QUrl::setPath( const QString& path )
{
    d->path = path;
    slashify( d->path );
    d->cleanPathDirty = TRUE;
    d->isValid = TRUE;
}

/*!
    Returns TRUE if the URL contains a path; otherwise returns FALSE.

    \sa path() setPath()
*/

bool QUrl::hasPath() const
{
    return !d->path.isEmpty();
}

/*!
    Sets the query of the URL to \a txt. \a txt must be encoded.

    \sa query() encode()
*/

void QUrl::setQuery( const QString& txt )
{
    d->queryEncoded = txt;
}

/*!
    Returns the (encoded) query of the URL.

    \sa setQuery() decode()
*/

QString QUrl::query() const
{
    return d->queryEncoded;
}

/*!
    Returns the (encoded) reference of the URL.

    \sa setRef() hasRef() decode()
*/

QString QUrl::ref() const
{
    return d->refEncoded;
}

/*!
    Sets the reference of the URL to \a txt. \a txt must be encoded.

    \sa ref() hasRef() encode()
*/

void QUrl::setRef( const QString& txt )
{
    d->refEncoded = txt;
}

/*!
    Returns TRUE if the URL has a reference; otherwise returns FALSE.

    \sa setRef()
*/

bool QUrl::hasRef() const
{
    return !d->refEncoded.isEmpty();
}

/*!
    Returns TRUE if the URL is valid; otherwise returns FALSE. A URL
    is invalid if it cannot be parsed, for example.
*/

bool QUrl::isValid() const
{
    return d->isValid;
}

/*!
    Resets all parts of the URL to their default values and
    invalidates it.
*/

void QUrl::reset()
{
    d->protocol = "file";
    d->user = "";
    d->pass = "";
    d->host = "";
    d->path = "";
    d->queryEncoded = "";
    d->refEncoded = "";
    d->isValid = TRUE;
    d->port = -1;
    d->cleanPathDirty = TRUE;
}

/*!
    Parses the \a url.
*/

bool QUrl::parse( const QString& url )
{
    QString url_( url );
    slashify( url_ );

    if ( url_.isEmpty() ) {
	d->isValid = FALSE;
	return FALSE;
    }

    d->cleanPathDirty = TRUE;
    d->isValid = TRUE;
    QString oldProtocol = d->protocol;
    d->protocol = QString::null;

    const int Init	= 0;
    const int Protocol	= 1;
    const int Separator1= 2; // :
    const int Separator2= 3; // :/
    const int Separator3= 4; // :// or more slashes
    const int User	= 5;
    const int Pass	= 6;
    const int Host	= 7;
    const int Path	= 8;
    const int Ref	= 9;
    const int Query	= 10;
    const int Port	= 11;
    const int Done	= 12;

    const int InputAlpha= 1;
    const int InputDigit= 2;
    const int InputSlash= 3;
    const int InputColon= 4;
    const int InputAt	= 5;
    const int InputHash = 6;
    const int InputQuery= 7;

    static uchar table[ 12 ][ 8 ] = {
     /* None       InputAlpha  InputDigit  InputSlash  InputColon  InputAt     InputHash   InputQuery */
	{ 0,       Protocol,   0,          Path,       0,          0,          0,          0,         }, // Init
	{ 0,       Protocol,   Protocol,   0,          Separator1, 0,          0,          0,         }, // Protocol
	{ 0,       Path,       Path,       Separator2, 0,          0,          0,          0,         }, // Separator1
	{ 0,       Path,       Path,       Separator3, 0,          0,          0,          0,         }, // Separator2
	{ 0,       User,       User,       Separator3, Pass,       Host,       0,          0,         }, // Separator3
	{ 0,       User,       User,       User,       Pass,       Host,       User,       User,      }, // User
	{ 0,       Pass,       Pass,       Pass,       Pass,       Host,       Pass,       Pass,      }, // Pass
	{ 0,       Host,       Host,       Path,       Port,       Host,       Ref,        Query,     }, // Host
	{ 0,       Path,       Path,       Path,       Path,       Path,       Ref,        Query,     }, // Path
	{ 0,       Ref,        Ref,        Ref,        Ref,        Ref,        Ref,        Query,     }, // Ref
	{ 0,       Query,      Query,      Query,      Query,      Query,      Query,      Query,     }, // Query
	{ 0,       0,          Port,       Path,       0,          0,          0,          0,         }  // Port
    };

    bool relPath = FALSE;

    relPath = FALSE;
    bool forceRel = FALSE;

    // If ':' is at pos 1, we have only one letter
    // before that separator => that's a drive letter!
    if ( url_.length() >= 2 && url_[1] == ':' )
	relPath = forceRel = TRUE;

    int hasNoHost = -1;
    int cs = url_.find( ":/" );
    if ( cs != -1 ) // if a protocol is there, find out if there is a host or directly the path after it
	hasNoHost = url_.find( "///", cs );
    table[ 4 ][ 1 ] = User;
    table[ 4 ][ 2 ] = User;
    if ( cs == -1 || forceRel ) { // we have a relative file
	if ( url.find( ':' ) == -1 || forceRel ) {
	    table[ 0 ][ 1 ] = Path;
	    // Filenames may also begin with a digit
	    table[ 0 ][ 2 ] = Path;
	} else {
	    table[ 0 ][ 1 ] = Protocol;
	}
	relPath = TRUE;
    } else { // some checking
	table[ 0 ][ 1 ] = Protocol;

	// find the part between the protocol and the path as the meaning
	// of that part is dependend on some chars
	++cs;
	while ( url_[ cs ] == '/' )
	    ++cs;
	int slash = url_.find( "/", cs );
	if ( slash == -1 )
	    slash = url_.length() - 1;
	QString tmp = url_.mid( cs, slash - cs + 1 );

	if ( !tmp.isEmpty() ) { // if this part exists

	    // look for the @ in this part
	    int at = tmp.find( "@" );
	    if ( at != -1 )
		at += cs;
	    // we have no @, which means host[:port], so directly
	    // after the protocol the host starts, or if the protocol
	    // is file or there were more than 2 slashes, itīs the
	    // path
	    if ( at == -1 ) {
		if ( url_.left( 4 ) == "file" || hasNoHost != -1 )
		    table[ 4 ][ 1 ] = Path;
		else
		    table[ 4 ][ 1 ] = Host;
		table[ 4 ][ 2 ] = table[ 4 ][ 1 ];
	    }
	}
    }

    int state = Init; // parse state
    int input; // input token

    QChar c = url_[ 0 ];
    int i = 0;
    QString port;

    for ( ;; ) {
	switch ( c ) {
	case '?':
	    input = InputQuery;
	    break;
	case '#':
	    input = InputHash;
	    break;
	case '@':
	    input = InputAt;
	    break;
	case ':':
	    input = InputColon;
	    break;
	case '/':
	    input = InputSlash;
	    break;
	case '1': case '2': case '3': case '4': case '5':
	case '6': case '7': case '8': case '9': case '0':
	    input = InputDigit;
	    break;
	default:
	    input = InputAlpha;
	}

	state = table[ state ][ input ];

	switch ( state ) {
	case Protocol:
	    d->protocol += c;
	    break;
	case User:
	    d->user += c;
	    break;
	case Pass:
	    d->pass += c;
	    break;
	case Host:
	    d->host += c;
	    break;
	case Path:
	    d->path += c;
	    break;
	case Ref:
	    d->refEncoded += c;
	    break;
	case Query:
	    d->queryEncoded += c;
	    break;
	case Port:
	    port += c;
	    break;
	default:
	    break;
	}

	++i;
	if ( i > (int)url_.length() - 1 || state == Done || state == 0 )
	    break;
	c = url_[ i ];

    }

    if ( !port.isEmpty() ) {
	port.remove( (uint)0, 1 );
	d->port = atoi( port.latin1() );
    }

    // error
    if ( i < (int)url_.length() - 1 ) {
	d->isValid = FALSE;
	return FALSE;
    }


    if ( d->protocol.isEmpty() )
	d->protocol = oldProtocol;

    if ( d->path.isEmpty() )
	d->path = "/";

    // hack for windows
    if ( d->path.length() == 2 && d->path[ 1 ] == ':' )
	d->path += "/";

    // #### do some corrections, should be done nicer too
    if ( !d->pass.isEmpty() ) {
	if ( d->pass[ 0 ] == ':' )
	    d->pass.remove( (uint)0, 1 );
	decode( d->pass );
    }
    if ( !d->user.isEmpty() ) {
	decode( d->user );
    }
    if ( !d->path.isEmpty() ) {
	if ( d->path[ 0 ] == '@' || d->path[ 0 ] == ':' )
	    d->path.remove( (uint)0, 1 );
	if ( d->path[ 0 ] != '/' && !relPath && d->path[ 1 ] != ':' )
	    d->path.prepend( "/" );
    }
    if ( !d->refEncoded.isEmpty() && d->refEncoded[ 0 ] == '#' )
	d->refEncoded.remove( (uint)0, 1 );
    if ( !d->queryEncoded.isEmpty() && d->queryEncoded[ 0 ] == '?' )
	d->queryEncoded.remove( (uint)0, 1 );
    if ( !d->host.isEmpty() && d->host[ 0 ] == '@' )
	d->host.remove( (uint)0, 1 );

#if defined(Q_OS_WIN32) || defined(Q_OS_OS2)
    // hack for windows file://machine/path syntax
    if ( d->protocol == "file" ) {
	if ( url.left( 7 ) == "file://" &&
	     d->path.length() > 1 && d->path[ 1 ] != ':' )
		 d->path.prepend( "/" );
    }
#endif

    decode( d->path );
    d->cleanPathDirty = TRUE;

#if 0
    qDebug( "URL: %s", url.latin1() );
    qDebug( "protocol: %s", d->protocol.latin1() );
    qDebug( "user: %s", d->user.latin1() );
    qDebug( "pass: %s", d->pass.latin1() );
    qDebug( "host: %s", d->host.latin1() );
    qDebug( "path: %s", path().latin1() );
    qDebug( "ref: %s", d->refEncoded.latin1() );
    qDebug( "query: %s", d->queryEncoded.latin1() );
    qDebug( "port: %d\n\n----------------------------\n\n", d->port );
#endif

    return TRUE;
}

/*!
    \overload

    Parses \a url and assigns the resulting data to this class.

    If you pass a string like "/home/qt" the "file" protocol will be
    assumed.
*/

QUrl& QUrl::operator=( const QString& url )
{
    reset();
    parse( url );

    return *this;
}

/*!
    Assigns the data of \a url to this class.
*/

QUrl& QUrl::operator=( const QUrl& url )
{
    *d = *url.d;
    return *this;
}

/*!
    Compares this URL with \a url and returns TRUE if they are equal;
    otherwise returns FALSE.
*/

bool QUrl::operator==( const QUrl& url ) const
{
    if ( !isValid() || !url.isValid() )
	return FALSE;

    if ( d->protocol == url.d->protocol &&
	 d->user == url.d->user &&
	 d->pass == url.d->pass &&
	 d->host == url.d->host &&
	 d->path == url.d->path &&
	 d->queryEncoded == url.d->queryEncoded &&
	 d->refEncoded == url.d->refEncoded &&
	 d->isValid == url.d->isValid &&
	 d->port == url.d->port )
	return TRUE;

    return FALSE;
}

/*!
    \overload

    Compares this URL with \a url. \a url is parsed first. Returns
    TRUE if \a url is equal to this url; otherwise returns FALSE.
*/

bool QUrl::operator==( const QString& url ) const
{
    QUrl u( url );
    return ( *this == u );
}

/*!
    Sets the file name of the URL to \a name. If this URL contains a
    fileName(), the original file name is replaced by \a name.

    See the documentation of fileName() for a more detailed discussion
    of what is handled as file name and what is handled as a directory
    path.

    \sa fileName()
*/

void QUrl::setFileName( const QString& name )
{
    QString fn( name );
    slashify( fn );

    while ( fn[ 0 ] == '/' )
	fn.remove( (uint)0, 1 );

    QString p;
    if ( path().isEmpty() ) {
	p = "/";
    } else {
	p = path();
	int slash = p.findRev( QChar( '/' ) );
	if ( slash == -1 ) {
	    p = "/";
	} else if ( p[ (int)p.length() - 1 ] != '/' ) {
	    p.truncate( slash + 1 );
	}
    }

    p += fn;
    if ( !d->queryEncoded.isEmpty() )
	p += "?" + d->queryEncoded;
    setEncodedPathAndQuery( p );
}

/*!
    Returns the encoded path and query.

    \sa decode()
*/

QString QUrl::encodedPathAndQuery()
{
    QString p = path();
    if ( p.isEmpty() )
	p = "/";

    encode( p );

    if ( !d->queryEncoded.isEmpty() ) {
	p += "?";
	p += d->queryEncoded;
    }

    return p;
}

/*!
    Parses \a pathAndQuery for a path and query and sets those values.
    The whole string must be encoded.

    \sa encode()
*/

void QUrl::setEncodedPathAndQuery( const QString& pathAndQuery )
{
    d->cleanPathDirty = TRUE;
    int pos = pathAndQuery.find( '?' );
    if ( pos == -1 ) {
	d->path = pathAndQuery;
	d->queryEncoded = "";
    } else {
	d->path = pathAndQuery.left( pos );
	d->queryEncoded = pathAndQuery.mid( pos + 1 );
    }

    decode( d->path );
    d->cleanPathDirty = TRUE;
}

extern bool qt_resolve_symlinks; // defined in qapplication.cpp

/*!
    Returns the path of the URL. If \a correct is TRUE, the path is
    cleaned (deals with too many or too few slashes, cleans things
    like "/../..", etc). Otherwise path() returns exactly the path
    that was parsed or set.

    \sa setPath() hasPath()
*/
QString QUrl::path( bool correct ) const
{
    if ( !correct )
	return d->path;

    if ( d->cleanPathDirty ) {
	bool check = TRUE;
	if ( QDir::isRelativePath( d->path ) ) {
	    d->cleanPath = d->path;
	} else if ( isLocalFile() ) {
#if defined(Q_OS_WIN32) || defined(Q_OS_OS2)
	    // hack for stuff like \\machine\path and //machine/path on windows
	    if ( ( d->path.left( 1 ) == "/" || d->path.left( 1 ) == "\\" ) && 
		 d->path.length() > 1 ) {
		d->cleanPath = d->path;
		bool share = (d->cleanPath[0] == '\\' && d->cleanPath[1] == '\\') || 
		             (d->cleanPath[0] == '/' && d->cleanPath[1] == '/');
		slashify( d->cleanPath, FALSE );
		d->cleanPath = QDir::cleanDirPath( d->cleanPath );
		if ( share ) {
		    check = FALSE;
		    while (d->cleanPath.at(0) != '/' || d->cleanPath.at(1) != '/')
			d->cleanPath.prepend("/");
		}
	    }
#endif
	    if ( check ) {
		QFileInfo fi( d->path );
		if ( !fi.exists() )
		    d->cleanPath = d->path;
		else if ( fi.isDir() ) {
		    QString dir =
			QDir::cleanDirPath( (qt_resolve_symlinks ?
					    QDir( d->path ).canonicalPath() :
					    QDir( d->path ).absPath()) ) + "/";
		    if ( dir == "//" )
			d->cleanPath = "/";
		    else
			d->cleanPath = dir;
		} else {
		    QString p =
			QDir::cleanDirPath( (qt_resolve_symlinks ?
					    fi.dir().canonicalPath() :
					    fi.dir().absPath()) );
		    d->cleanPath = p + "/" + fi.fileName();
		}
	    }
	} else {
	    if ( d->path != "/" && d->path[ (int)d->path.length() - 1 ] == '/' )
		d->cleanPath = QDir::cleanDirPath( d->path ) + "/";
	    else
		d->cleanPath = QDir::cleanDirPath( d->path );
	}

	if ( check )
	    slashify( d->cleanPath, FALSE );
	d->cleanPathDirty = FALSE;
    }

    return d->cleanPath;
}

/*!
    Returns TRUE if the URL is a local file; otherwise returns FALSE.
*/

bool QUrl::isLocalFile() const
{
    return d->protocol == "file";
}

/*!
    Returns the file name of the URL. If the path of the URL doesn't
    have a slash at the end, the part between the last slash and the
    end of the path string is considered to be the file name. If the
    path has a slash at the end, an empty string is returned here.

    \sa setFileName()
*/

QString QUrl::fileName() const
{
    if ( d->path.isEmpty() || d->path.endsWith( "/" )
#if defined(Q_WS_WIN) || defined(Q_OS_OS2)
	|| d->path.endsWith( "\\" )
#endif
	)
	return QString::null;

    return QFileInfo( d->path ).fileName();
}

/*!
    Adds the path \a pa to the path of the URL.

    \sa setPath() hasPath()
*/

void QUrl::addPath( const QString& pa )
{
    if ( pa.isEmpty() )
	return;

    QString p( pa );
    slashify( p );

    if ( path().isEmpty() ) {
	if ( p[ 0 ] != QChar( '/' ) )
	    d->path = "/" + p;
	else
	    d->path = p;
    } else {
	if ( p[ 0 ] != QChar( '/' ) && d->path[ (int)d->path.length() - 1 ] != '/' )
	    d->path += "/" + p;
	else
	    d->path += p;
    }
    d->cleanPathDirty = TRUE;
}

/*!
    Returns the directory path of the URL. This is the part of the
    path of the URL without the fileName(). See the documentation of
    fileName() for a discussion of what is handled as file name and
    what is handled as directory path.

    \sa setPath() hasPath()
*/

QString QUrl::dirPath() const
{
    if ( path().isEmpty() )
	return QString::null;

    QString s = path();
    int pos = s.findRev( '/' );
    if ( pos == -1 ) {
	return QString::fromLatin1(".");
    } else {
	if ( pos == 0 )
	    return QString::fromLatin1( "/" );
	return s.left( pos );
    }
}

/*!
    Encodes the \a url in-place into UTF-8.  For example

    \code
	QString url = http://www.trolltech.com
	QUrl::encode( url );
	// url is now "http%3A//www%20trolltech%20com"
    \endcode

  \sa decode()
*/

void QUrl::encode( QString& url )
{
    if ( url.isEmpty() )
	return;

    QCString curl = url.utf8();
    int oldlen = curl.length();

    const QCString special( "<>#@\"&%$:,;?={}|^~[]\'`\\ \n\t\r" );
    QString newUrl;
    int newlen = 0;

    for ( int i = 0; i < oldlen ;++i ) {
	uchar inCh = (uchar)curl[ i ];

	if ( inCh >= 128 || special.contains(inCh) ) {
	    newUrl[ newlen++ ] = QChar( '%' );

	    ushort c = inCh / 16;
	    c += c > 9 ? 'A' - 10 : '0';
	    newUrl[ newlen++ ] = c;

	    c = inCh % 16;
	    c += c > 9 ? 'A' - 10 : '0';
	    newUrl[ newlen++ ] = c;
	} else {
	    newUrl[ newlen++ ] = inCh;
	}
    }

    url = newUrl;
}

static uchar hex_to_int( uchar c )
{
    if ( c >= 'A' && c <= 'F' )
	return c - 'A' + 10;
    if ( c >= 'a' && c <= 'f')
	return c - 'a' + 10;
    if ( c >= '0' && c <= '9')
	return c - '0';
    return 0;
}

/*!
    Decodes the \a url in-place into UTF-8.  For example

    \code
	QString url = "http%3A//www%20trolltech%20com"
	QUrl::decode( url );
	// url is now "http://www.trolltech.com"
    \endcode

    \sa encode()
*/

void QUrl::decode( QString& url )
{
    if ( url.isEmpty() )
	return;

    int newlen = 0;
    QCString curl = url.utf8();
    int oldlen = curl.length();

    QCString newUrl(oldlen);

    int i = 0;
    while ( i < oldlen ) {
	uchar c = (uchar)curl[ i++ ];
	if ( c == '%' && i <= oldlen - 2 ) {
	    c = hex_to_int( (uchar)curl[ i ] ) * 16 + hex_to_int( (uchar)curl[ i + 1 ] );
	    i += 2;
	}
	newUrl [ newlen++ ] = c;
    }
    newUrl.truncate( newlen );

    url = QString::fromUtf8(newUrl.data());
}


/*!
    Composes a string version of the URL and returns it. If \a
    encodedPath is TRUE the path in the returned string is encoded. If
    \a forcePrependProtocol is TRUE and \a encodedPath looks like a
    local filename, the "file:/" protocol is also prepended.

    \sa encode() decode()
*/

QString QUrl::toString( bool encodedPath, bool forcePrependProtocol ) const
{
    QString res, p = path();
    if ( encodedPath )
	encode( p );

    if ( isLocalFile() ) {
	if ( forcePrependProtocol )
	    res = d->protocol + ":" + p;
	else
	    res = p;
    } else if ( d->protocol == "mailto" ) {
	res = d->protocol + ":" + p;
    } else {
	res = d->protocol + "://";
	if ( !d->user.isEmpty() || !d->pass.isEmpty() ) {
	    QString tmp;
	    if ( !d->user.isEmpty() ) {
		tmp = d->user;
		encode( tmp );
		res += tmp;
	    }
	    if ( !d->pass.isEmpty() ) {
		tmp = d->pass;
		encode( tmp );
		res += ":" + tmp;
	    }
	    res += "@";
	}
	res += d->host;
	if ( d->port != -1 )
	    res += ":" + QString( "%1" ).arg( d->port );
	if ( !p.isEmpty() ) {
	    if ( !d->host.isEmpty() && p[0]!='/' )
		res += "/";
	    res += p;
	}
    }

    if ( !d->refEncoded.isEmpty() )
	res += "#" + d->refEncoded;
    if ( !d->queryEncoded.isEmpty() )
	res += "?" + d->queryEncoded;

    return res;
}

/*!
    Composes a string version of the URL and returns it.

    \sa QUrl::toString()
*/

QUrl::operator QString() const
{
    return toString();
}

/*!
    Changes the directory to one directory up.

    \sa setPath()
*/

bool QUrl::cdUp()
{
    d->path += "/..";
    d->cleanPathDirty = TRUE;
    return TRUE;
}

#endif // QT_NO_URL
