/****************************************************************************

**

** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the QtCore module of the Qt Toolkit.

**

** $QT_BEGIN_LICENSE:LGPL$

** No Commercial Usage

** This file contains pre-release code and may not be distributed.

** You may use this file in accordance with the terms and conditions

** contained in the Technology Preview License Agreement accompanying

** this package.

**

** GNU Lesser General Public License Usage

** Alternatively, this file may be used under the terms of the GNU Lesser

** General Public License version 2.1 as published by the Free Software

** Foundation and appearing in the file LICENSE.LGPL included in the

** packaging of this file.  Please review the following information to

** ensure the GNU Lesser General Public License version 2.1 requirements

** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

**

** In addition, as a special exception, Nokia gives you certain additional

** rights.  These rights are described in the Nokia Qt LGPL Exception

** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

**

** If you have questions regarding the use of this file, please contact

** Nokia at qt-info@nokia.com.

**

**

**

**

**

**

**

**

** $QT_END_LICENSE$

**

****************************************************************************/

#include "qplatformdefs.h"

#include "qtranslator.h"

#ifndef QT_NO_TRANSLATION

#include "qfileinfo.h"

#include "qstring.h"

#include "qcoreapplication.h"

#include "qcoreapplication_p.h"

#include "qdatastream.h"

#include "qfile.h"

#include "qmap.h"

#include "qalgorithms.h"

#include "qhash.h"

#include "qtranslator_p.h"

#if defined(Q_OS_UNIX)

#define QT_USE_MMAP

#include "private/qcore_unix_p.h"

#endif

// most of the headers below are already included in qplatformdefs.h

// also this lacks Large File support but that's probably irrelevant

#if defined(QT_USE_MMAP)

// for mmap

#include <sys/mman.h>

#include <errno.h>

#endif

#include <stdlib.h>

#include "qobject_p.h"

QT_BEGIN_NAMESPACE

enum Tag { Tag_End = 1, Tag_SourceText16, Tag_Translation, Tag_Context16, Tag_Obsolete1,

           Tag_SourceText, Tag_Context, Tag_Comment, Tag_Obsolete2 };

/*

$ mcookie

3cb86418caef9c95cd211cbf60a1bddd

$

*/

// magic number for the file

static const int MagicLength = 16;

static const uchar magic[MagicLength] = {

    0x3c, 0xb8, 0x64, 0x18, 0xca, 0xef, 0x9c, 0x95,

    0xcd, 0x21, 0x1c, 0xbf, 0x60, 0xa1, 0xbd, 0xdd

};

static bool match(const uchar* found, const char* target, uint len)

{

    // catch the case if \a found has a zero-terminating symbol and \a len includes it.

    // (normalize it to be without the zero-terminating symbol)

    if (len > 0 && found[len-1] == '\0')

        --len;

    return (memcmp(found, target, len) == 0 && target[len] == '\0');

}

static uint elfHash(const char *name)

{

    const uchar *k;

    uint h = 0;

    uint g;

    if (name) {

        k = (const uchar *) name;

        while (*k) {

            h = (h << 4) + *k++;

            if ((g = (h & 0xf0000000)) != 0)

                h ^= g >> 24;

            h &= ~g;

        }

    }

    if (!h)

        h = 1;

    return h;

}

static int numerusHelper(int n, const uchar *rules, int rulesSize)

{

#define CHECK_RANGE \

    do { \

        if (i >= rulesSize) \

            return -1; \

    } while (0)

    int result = 0;

    int i = 0;

    if (rulesSize == 0)

        return 0;

    for (;;) {

        bool orExprTruthValue = false;

        for (;;) {

            bool andExprTruthValue = true;

            for (;;) {

                bool truthValue = true;

                CHECK_RANGE;

                int opcode = rules[i++];

                int leftOperand = n;

                if (opcode & Q_MOD_10) {

                    leftOperand %= 10;

                } else if (opcode & Q_MOD_100) {

                    leftOperand %= 100;

                } else if (opcode & Q_LEAD_1000) {

                    while (leftOperand >= 1000)

                        leftOperand /= 1000;

                }

                int op = opcode & Q_OP_MASK;

                CHECK_RANGE;

                int rightOperand = rules[i++];

                switch (op) {

                default:

                    return -1;

                case Q_EQ:

                    truthValue = (leftOperand == rightOperand);

                    break;

                case Q_LT:

                    truthValue = (leftOperand < rightOperand);

                    break;

                case Q_LEQ:

                    truthValue = (leftOperand <= rightOperand);

                    break;

		case Q_BETWEEN:

                    int bottom = rightOperand;

                    CHECK_RANGE;

                    int top = rules[i++];

                    truthValue = (leftOperand >= bottom && leftOperand <= top);

                }

                if (opcode & Q_NOT)

                    truthValue = !truthValue;

                andExprTruthValue = andExprTruthValue && truthValue;

                if (i == rulesSize || rules[i] != Q_AND)

                    break;

                ++i;

            }

            orExprTruthValue = orExprTruthValue || andExprTruthValue;

            if (i == rulesSize || rules[i] != Q_OR)

                break;

            ++i;

        }

        if (orExprTruthValue)

            return result;

        ++result;

        if (i == rulesSize)

            return result;

        if (rules[i++] != Q_NEWRULE)

            break;

    }

    return -1;

}

class QTranslatorPrivate : public QObjectPrivate

{

    Q_DECLARE_PUBLIC(QTranslator)

public:

    enum { Contexts = 0x2f, Hashes = 0x42, Messages = 0x69, NumerusRules = 0x88 };

    QTranslatorPrivate()

        : used_mmap(0), unmapPointer(0), unmapLength(0),

          messageArray(0), offsetArray(0), contextArray(0), numerusRulesArray(0),

          messageLength(0), offsetLength(0), contextLength(0), numerusRulesLength(0) {}

    // for mmap'ed files, this is what needs to be unmapped.

    bool used_mmap : 1;

    char *unmapPointer;

    unsigned int unmapLength;

    // for squeezed but non-file data, this is what needs to be deleted

    const uchar *messageArray;

    const uchar *offsetArray;

    const uchar *contextArray;

    const uchar *numerusRulesArray;

    uint messageLength;

    uint offsetLength;

    uint contextLength;

    uint numerusRulesLength;

    bool do_load(const uchar *data, int len);

    QString do_translate(const char *context, const char *sourceText, const char *comment,

                         int n) const;

    void clear();

};

/*!

    \class QTranslator

    \brief The QTranslator class provides internationalization support for text

    output.

    \ingroup i18n

    An object of this class contains a set of translations from a

    source language to a target language. QTranslator provides

    functions to look up translations in a translation file.

    Translation files are created using \l{Qt Linguist}.

    The most common use of QTranslator is to: load a translation

    file, install it using QApplication::installTranslator(), and use

    it via QObject::tr(). Here's the \c main() function from the

    \l{linguist/hellotr}{Hello tr()} example:

    \snippet examples/linguist/hellotr/main.cpp 2

    Note that the translator must be created \e before the

    application's widgets.

    Most applications will never need to do anything else with this

    class. The other functions provided by this class are useful for

    applications that work on translator files.

    \section1 Looking up Translations

    It is possible to look up a translation using translate() (as tr()

    and QApplication::translate() do). The translate() function takes

    up to three parameters:

    \list

    \o The \e context - usually the class name for the tr() caller.

    \o The \e {source text} - usually the argument to tr().

    \o The \e disambiguation - an optional string that helps disambiguate

       different uses of the same text in the same context.

    \endlist

    For example, the "Cancel" in a dialog might have "Anuluj" when the

    program runs in Polish (in this case the source text would be

    "Cancel"). The context would (normally) be the dialog's class

    name; there would normally be no comment, and the translated text

    would be "Anuluj".

    But it's not always so simple. The Spanish version of a printer

    dialog with settings for two-sided printing and binding would

    probably require both "Activado" and "Activada" as translations

    for "Enabled". In this case the source text would be "Enabled" in

    both cases, and the context would be the dialog's class name, but

    the two items would have disambiguations such as "two-sided printing"

    for one and "binding" for the other. The disambiguation enables the

    translator to choose the appropriate gender for the Spanish version,

    and enables Qt to distinguish between translations.

    \section1 Using Multiple Translations

    Multiple translation files can be installed in an application.

    Translations are searched for in the reverse order in which they were

    installed, so the most recently installed translation file is searched

    for translations first and the earliest translation file is searched

    last. The search stops as soon as a translation containing a matching

    string is found.

    This mechanism makes it possible for a specific translation to be

    "selected" or given priority over the others; simply uninstall the

    translator from the application by passing it to the

    QApplication::removeTranslator() function and reinstall it with

    QApplication::installTranslator(). It will then be the first

    translation to be searched for matching strings.

    \sa QApplication::installTranslator(), QApplication::removeTranslator(),

        QObject::tr(), QApplication::translate(), {I18N Example},

        {Hello tr() Example}, {Arrow Pad Example}, {Troll Print Example}

*/

/*!

    Constructs an empty message file object with parent \a parent that

    is not connected to any file.

*/

QTranslator::QTranslator(QObject * parent)

    : QObject(*new QTranslatorPrivate, parent)

{

}

#ifdef QT3_SUPPORT

/*!

    \overload QTranslator()

    \obsolete

 */

QTranslator::QTranslator(QObject * parent, const char * name)

    : QObject(*new QTranslatorPrivate, parent)

{

    setObjectName(QString::fromAscii(name));

}

#endif

/*!

    Destroys the object and frees any allocated resources.

*/

QTranslator::~QTranslator()

{

    if (QCoreApplication::instance())

        QCoreApplication::removeTranslator(this);

    Q_D(QTranslator);

    d->clear();

}

/*!

    Loads \a filename + \a suffix (".qm" if the \a suffix is

    not specified), which may be an absolute file name or relative

    to \a directory. Returns true if the translation is successfully

    loaded; otherwise returns false.

    The previous contents of this translator object are discarded.

    If the file name does not exist, other file names are tried

    in the following order:

    \list 1

    \o File name without \a suffix appended.

    \o File name with text after a character in \a search_delimiters

       stripped ("_." is the default for \a search_delimiters if it is

       an empty string) and \a suffix.

    \o File name stripped without \a suffix appended.

    \o File name stripped further, etc.

    \endlist

    For example, an application running in the fr_CA locale

    (French-speaking Canada) might call load("foo.fr_ca",

    "/opt/foolib"). load() would then try to open the first existing

    readable file from this list:

    \list 1

    \o \c /opt/foolib/foo.fr_ca.qm

    \o \c /opt/foolib/foo.fr_ca

    \o \c /opt/foolib/foo.fr.qm

    \o \c /opt/foolib/foo.fr

    \o \c /opt/foolib/foo.qm

    \o \c /opt/foolib/foo

    \endlist

*/

bool QTranslator::load(const QString & filename, const QString & directory,

                       const QString & search_delimiters,

                       const QString & suffix)

{

    Q_D(QTranslator);

    d->clear();

    QString prefix;

    if (QFileInfo(filename).isRelative()) {

        prefix = directory;

	if (prefix.length() && !prefix.endsWith(QLatin1Char('/')))

	    prefix += QLatin1Char('/');

    }

    QString fname = filename;

    QString realname;

    QString delims;

    delims = search_delimiters.isNull() ? QString::fromLatin1("_.") : search_delimiters;

    for (;;) {

        QFileInfo fi;

        realname = prefix + fname + (suffix.isNull() ? QString::fromLatin1(".qm") : suffix);

        fi.setFile(realname);

        if (fi.isReadable())

            break;

        realname = prefix + fname;

        fi.setFile(realname);

        if (fi.isReadable())

            break;

        int rightmost = 0;

        for (int i = 0; i < (int)delims.length(); i++) {

            int k = fname.lastIndexOf(delims[i]);

            if (k > rightmost)

                rightmost = k;

        }

        // no truncations? fail

        if (rightmost == 0)

            return false;

        fname.truncate(rightmost);

    }

    // realname is now the fully qualified name of a readable file.

    bool ok = false;

#ifdef QT_USE_MMAP

#ifndef MAP_FILE

#define MAP_FILE 0

#endif

#ifndef MAP_FAILED

#define MAP_FAILED -1

#endif

    int fd = -1;

    if (!realname.startsWith(QLatin1Char(':')))

        fd = QT_OPEN(QFile::encodeName(realname), O_RDONLY,

#if defined(Q_OS_WIN)

                     _S_IREAD | _S_IWRITE

#else

                     0666

#endif

            );

    if (fd >= 0) {

        QT_STATBUF st;

        if (!QT_FSTAT(fd, &st)) {

            char *ptr;

            ptr = reinterpret_cast<char *>(

                mmap(0, st.st_size,             // any address, whole file

                     PROT_READ,                 // read-only memory

                     MAP_FILE | MAP_PRIVATE,    // swap-backed map from file

                     fd, 0));                   // from offset 0 of fd

            if (ptr && ptr != reinterpret_cast<char *>(MAP_FAILED)) {

                d->used_mmap = true;

                d->unmapPointer = ptr;

                d->unmapLength = st.st_size;

                ok = true;

            }

        }

        ::close(fd);

    }

#endif // QT_USE_MMAP

    if (!ok) {

        QFile file(realname);

        d->unmapLength = file.size();

        if (!d->unmapLength)

            return false;

        d->unmapPointer = new char[d->unmapLength];

        if (file.open(QIODevice::ReadOnly))

            ok = (d->unmapLength == (uint)file.read(d->unmapPointer, d->unmapLength));

        if (!ok) {

            delete [] d->unmapPointer;

            d->unmapPointer = 0;

            d->unmapLength = 0;

            return false;

        }

    }

    return d->do_load(reinterpret_cast<const uchar *>(d->unmapPointer), d->unmapLength);

}

/*!

  \overload load()

  \fn bool QTranslator::load(const uchar *data, int len)

  Loads the QM file data \a data of length \a len into the

  translator.

  The data is not copied. The caller must be able to guarantee that \a data

  will not be deleted or modified.

*/

bool QTranslator::load(const uchar *data, int len)

{

    Q_D(QTranslator);

    d->clear();

    return d->do_load(data, len);

}

static quint8 read8(const uchar *data)

{

    return *data;

}

static quint16 read16(const uchar *data)

{

    return (data[0] << 8) | (data[1]);

}

static quint32 read32(const uchar *data)

{