Fix reading truncated data when the next segment offset is set #326
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Fixes #317
The current logic for checking for truncated segments only checked whether the next segment offset was set to
0xFFFFFFFFFFFFFFFF, but it's also possible that the next segment offset could be beyond the end of the file, which would cause the channel length to be calculated incorrectly and result in zero padded data when reading all values and finding that the number of bytes expected couldn't be read.