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https://issues.apache.org/jira/browse/QPID-8453?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Clifford Jansen resolved QPID-8453.
-----------------------------------
Resolution: Fixed
> The message encoder for AMQP 1.0 incorrectly switches between map8 and map32
> representations.
> ---------------------------------------------------------------------------------------------
>
> Key: QPID-8453
> URL: https://issues.apache.org/jira/browse/QPID-8453
> Project: Qpid
> Issue Type: Bug
> Components: C++ Client
> Affects Versions: qpid-cpp-1.39.0
> Reporter: Clifford Jansen
> Assignee: Clifford Jansen
> Priority: Major
> Attachments: codec.sh
>
>
> The encoder will use a more compact map8 encoding if it can write out a map
> that way. The wire representation of the map is:
> size_of_count_and_data
> count
> data
> Where the first two are 8 bits each for a map8 and 32 bits each for a map32.
> The test to switch between map8 and map32 neglects to factor in the
> additional "count" byte, but does add the extra byte and size while writing
> the encoding. This can result in using a map with size of 255 (excluding the
> count), deciding to use map8 encoding, and then writing a
> size_of_count_and_data of zero (uint8_t: 255 + 1).
>
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