[Zint-barcode] [PATCH] Binary data corruption in Aztec codes

[Karl S. <0x...@gm...>]

Hi,

When PUNC or DIGIT is immediately followed by BINARY in zint's aztec
implementation, the data following BINARY is corrupt.  Attached is a
patch.

This is caused because shifting to binary from digit or punc requires
first changing to upper.  But zint records the previous table as the
one prior to both changes, and hence inserts the wrong control code
after the binary shift is over.  The patch records upper as the
previous table when it is required as a transition to binary.