There are multiple formats for storing multiple serialized OSI messages into one trace file.
- *.osi
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Binary trace file. Messages are separated by a length specification before each message. The length is represented by a four-byte, little-endian, unsigned integer. The length does not include the integer itself.
- *.txt
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Plain-text trace file. Messages are separated by
__. - *.txth
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Human-readable plain-text trace file. Messages are separated by newlines. Such a file may be used for manual checks.