C struct types have a fixed size (except possibly for their last field). The OP's record format is variable-width.

At a glance, one might think this module useless, but the module goes beyond the ability to handle C structs. It provides the ability to do length-prefixed fields, and it provides the ability to use custom packing and unpacking routines on a per-field basis. The former doesn't help, but the latter (called "hooks") could maybe handle the text fields.

Update: I tried, and I don't think it's possible using this module.

In reply to Re^2: unpacking mixed ascii & utf16 null termed strings by ikegami
in thread unpacking mixed ascii & utf16 null termed strings by patcat88

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