Clifford Jansen created QPID-8453:
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Summary: 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
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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