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  1. Qt
  2. QTBUG-105034

QDataStream cannot serialize containers > 2Gi elements

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    • Icon: Bug Bug
    • Resolution: Unresolved
    • Icon: P2: Important P2: Important
    • None
    • 6.2.4, 6.3.1, 6.4.0 Beta2
    • Core: Serialization
    • None
    • 13
    • Foundation PM Prioritized

      The code fails on 64-bit platforms:

      QByteArray ba;
const QString str =  ~~~ more than 2Gi characters ~~~;
QDataStream(&ba) << str;
QString restored;
QDataStream(ba) >> restored;
assert(restored == str);

      Ditto all other containers.

      The problem seems to be that the serialisation format only allocates a four-octet length field.

      There doesn't appear to be something you can do, unless you change the format to include a longer length indicator.

        For Gerrit Dashboard: QTBUG-105034
        # Subject Branch Project Status CR V
        427159,1 QString: remove narrowing cast from qsizetype/size_t to uint dev qt/qtbase Status: ABANDONED +2 0
        510834,13 Add support for containers > 4 Gi elements in QDataStream dev qt/qtbase Status: MERGED -1 0

            cnn Qt Core & Network
            mmutz Marc Mutz
            Vladimir Minenko Vladimir Minenko
            Alex Blasche Alex Blasche
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              Created:
              Updated:

                There are no open Gerrit changes