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  1. Qt
  2. QTBUG-104972

qUncompress(qCompress()) round-trip fails for data > 2GiB

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Details

    • 3
    • 2fd990b386 (qt/qtbase/dev) 2fd990b386 (qt/tqtc-qtbase/dev) 93aa02e671 (qt/qtbase/6.4) 93aa02e671 (qt/tqtc-qtbase/6.4) 2a4d5b41cb (qt/tqtc-qtbase/6.2) 93aa02e671 (qt/tqtc-qtbase/6.4.1) 93aa02e671 (qt/tqtc-qtbase/tqtc/qtinsight-6.4)
    • Foundation Sprint 61, Foundation Sprint 62, Foundation Sprint 63, Foundation Sprint 64, Foundation Sprint 65, Foundation Sprint 66, Foundation Sprint 67, Foundation Sprint 68

    Description

      The code fails on 64-bit platforms:

      const QByteArray ba = ~~~ more than 4GiB of data ~~~;
const QByteArray compressed = qCompress(ba);
const QByteArray uncompressed = qUncompress(compressed);
Q_COMPARE(ba, uncompressed);

      It seems to be caused by qCompress() using only four digits to encode the length.

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

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        Issue Links

          resulted from

          Task - A task that needs to be done. QTBUG-103531 Finish migration to qsizetype [qtbase/src/corelib/text]

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed
          resulted in

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-106542 qCompress()/qUncompress() cannot handle more than 4GiB of data on Win64

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed

          Task - A task that needs to be done. QTBUG-106543 Develop a method to encode more than UINT_MAX in qCompress() length field

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Open

          Task - A task that needs to be done. QTBUG-107698 Improve output buffer estimation in qCompress()

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Open
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              mmutz Marc Mutz
              mmutz Marc Mutz
              Vladimir Minenko Vladimir Minenko
              Alex Blasche Alex Blasche
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              Dates

                Created:
                Updated:
                Resolved:

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