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/*  -*- c++ -*-
    kmime_header_parsing.h

    KMime, the KDE Internet mail/usenet news message library.
    Copyright (c) 2001-2002 Marc Mutz <mutz@kde.org>

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.
*/

#ifndef __KMIME_HEADER_PARSING_H__
#define __KMIME_HEADER_PARSING_H__

#include "kmime_export.h"
#include "kmime_types.h"

#include <QtCore/QString>
#include <QtCore/QPair>
#include <QtCore/QVector>

#include <qdatetime.h>

template <typename K, typename V> class QMap;
class QStringList;

namespace KMime
{

namespace Headers
{
class Base;
}

namespace Types
{

// for when we can't make up our mind what to use...
// FIXME: Remove this thing, we should _always_ know whether we are handling a
// byte array or a string.
// In most places where this is used, it should simply be replaced by QByteArray
struct KMIME_EXPORT QStringOrQPair {
    QStringOrQPair() : qstring(), qpair(0, 0) {}
    QString qstring;
    QPair<const char *, int> qpair;
};

} // namespace KMime::Types

namespace HeaderParsing
{

/**
  Parses the encoded word.

  @param scursor pointer to the first character beyond the initial '=' of
  the input string.
  @param send pointer to end of input buffer.
  @param result the decoded string the encoded work represented.
  @param language The language parameter according to RFC 2231, section 5.
  @param usedCS    the used charset is returned here
  @param defaultCS the charset to use in case the detected
                   one isn't known to us.
  @param forceCS   force the use of the default charset.

  @return true if the input string was successfully decode; false otherwise.
*/
KMIME_EXPORT bool parseEncodedWord(const char *&scursor,
                                   const char *const send,
                                   QString &result, QByteArray &language,
                                   QByteArray &usedCS, const QByteArray &defaultCS = QByteArray(),
                                   bool forceCS = false);

//
// The parsing squad:
//

/** You may or may not have already started parsing into the
    atom. This function will go on where you left off. */
KMIME_EXPORT bool parseAtom(const char *&scursor, const char *const send,
                            QString &result, bool allow8Bit = false);

KMIME_EXPORT bool parseAtom(const char *&scursor, const char *const send,
                            QPair<const char *, int> &result,
                            bool allow8Bit = false);

/** You may or may not have already started parsing into the
    token. This function will go on where you left off. */
KMIME_EXPORT bool parseToken(const char *&scursor, const char *const send,
                             QString &result, bool allow8Bit = false);

KMIME_EXPORT bool parseToken(const char *&scursor, const char *const send,
                             QPair<const char *, int> &result,
                             bool allow8Bit = false);

/** @p scursor must be positioned after the opening openChar. */
KMIME_EXPORT bool parseGenericQuotedString(const char *&scursor,
        const char *const send,
        QString &result, bool isCRLF,
        const char openChar = '"',
        const char closeChar = '"');

/** @p scursor must be positioned right after the opening '(' */
KMIME_EXPORT bool parseComment(const char *&scursor, const char *const send,
                               QString &result, bool isCRLF = false,
                               bool reallySave = true);

/**
  Parses a phrase.

  You may or may not have already started parsing into the phrase, but
  only if it starts with atext. If you setup this function to parse a
  phrase starting with an encoded-word or quoted-string, @p scursor has
  to point to the char introducing the encoded-word or quoted-string, resp.

  @param scursor pointer to the first character beyond the initial '=' of
  the input string.
  @param send pointer to end of input buffer.
  @param result the parsed string.

  @return true if the input phrase was successfully parsed; false otherwise.
*/
KMIME_EXPORT bool parsePhrase(const char *&scursor, const char *const send,
                              QString &result, bool isCRLF = false);

/**
  Parses into the initial atom.
  You may or may not have already started parsing into the initial
  atom, but not up to it's end.

  @param scursor pointer to the first character beyond the initial '=' of
  the input string.
  @param send pointer to end of input buffer.
  @param result the parsed string.

  @return true if the input phrase was successfully parsed; false otherwise.
*/
KMIME_EXPORT bool parseDotAtom(const char *&scursor, const char *const send,
                               QString &result, bool isCRLF = false);

/**
  Eats comment-folding-white-space, skips whitespace, folding and comments
  (even nested ones) and stops at the next non-CFWS character.  After
  calling this function, you should check whether @p scursor == @p send
  (end of header reached).

  If a comment with unbalanced parantheses is encountered, @p scursor
  is being positioned on the opening '(' of the outmost comment.

  @param scursor pointer to the first character beyond the initial '=' of
  the input string.
  @param send pointer to end of input buffer.
  @param isCRLF true if input string is terminated with a CRLF.
*/
KMIME_EXPORT void eatCFWS(const char *&scursor, const char *const send,
                          bool isCRLF);

KMIME_EXPORT bool parseDomain(const char *&scursor, const char *const send,
                              QString &result, bool isCRLF = false);

KMIME_EXPORT bool parseObsRoute(const char *&scursor, const char *const send,
                                QStringList &result, bool isCRLF = false,
                                bool save = false);

KMIME_EXPORT bool parseAddrSpec(const char *&scursor, const char *const send,
                                Types::AddrSpec &result, bool isCRLF = false);

KMIME_EXPORT bool parseAngleAddr(const char *&scursor, const char *const send,
                                 Types::AddrSpec &result, bool isCRLF = false);

/**
  Parses a single mailbox.

  RFC 2822, section 3.4 defines a mailbox as follows:
  <pre>mailbox := addr-spec / ([ display-name ] angle-addr)</pre>

  KMime also accepts the legacy format of specifying display names:
  <pre>mailbox := (addr-spec [ "(" display-name ")" ])
  / ([ display-name ] angle-addr)
  / (angle-addr "(" display-name ")")</pre>

  @param scursor pointer to the first character of the input string
  @param send pointer to end of input buffer
  @param result the parsing result
  @param isCRLF true if input string is terminated with a CRLF.
*/
KMIME_EXPORT bool parseMailbox(const char *&scursor, const char *const send,
                               Types::Mailbox &result, bool isCRLF = false);

KMIME_EXPORT bool parseGroup(const char *&scursor, const char *const send,
                             Types::Address &result, bool isCRLF = false);

KMIME_EXPORT bool parseAddress(const char *&scursor, const char *const send,
                               Types::Address &result, bool isCRLF = false);

KMIME_EXPORT bool parseAddressList(const char *&scursor,
                                   const char *const send,
                                   Types::AddressList &result,
                                   bool isCRLF = false);

KMIME_EXPORT bool parseParameter(const char *&scursor, const char *const send,
                                 QPair<QString, Types::QStringOrQPair> &result,
                                 bool isCRLF = false);

KMIME_EXPORT bool parseParameterList(const char *&scursor,
                                     const char *const send,
                                     QMap<QString, QString> &result,
                                     bool isCRLF = false);

KMIME_EXPORT bool parseRawParameterList(const char *&scursor,
                                        const char *const send,
                                        QMap<QString, Types::QStringOrQPair> &result,
                                        bool isCRLF = false);

/**
 * Extract the charset embedded in the parameter list if there is one.
 *
 * @since 4.5
 */
KMIME_EXPORT bool parseParameterListWithCharset(const char *&scursor,
        const char *const send,
        QMap<QString, QString> &result,
        QByteArray &charset, bool isCRLF = false);

/**
  Parses an integer number.
  @param scursor pointer to the first character of the input string
  @param send pointer to end of input buffer
  @param result the parsing result
  @returns The number of parsed digits (don't confuse with @p result!)
*/
KMIME_EXPORT int parseDigits(const char *&scursor, const char *const send, int &result);

KMIME_EXPORT bool parseTime(const char *&scursor, const char *const send,
                            int &hour, int &min, int &sec,
                            long int &secsEastOfGMT,
                            bool &timeZoneKnown, bool isCRLF = false);

KMIME_EXPORT bool parseDateTime(const char *&scursor, const char *const send,
                                QDateTime &result, bool isCRLF = false);

/**
 * Extracts and returns the first header that is contained in the given byte array.
 * The header will also be removed from the passed-in byte array head.
 *
 * @since 4.4
 */
KMIME_EXPORT KMime::Headers::Base *extractFirstHeader(QByteArray &head);

/**
 * Extract the header header and the body from a complete content.
 * Internally, it will simply look for the first newline and use that as a
 * separator between the header and the body.
 *
 * @param content the complete mail
 * @param header return value for the extracted header
 * @param body return value for the extracted body
 * @since 4.6
 */
KMIME_EXPORT void extractHeaderAndBody(const QByteArray &content,
                                       QByteArray &header, QByteArray &body);

} // namespace HeaderParsing

} // namespace KMime

#endif // __KMIME_HEADER_PARSING_H__