fix: harsher hex string parsing to avoid more dire parsing errors #195
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running fuzz tests on my mac for the text extraction project was failing erratically for one of the files (526).
also recreating a decompressed version didn't work.
traced the first problem to a too permissive hex string parsing which caused over-reads.
and the second problem to a too restrictive zip decoding issue where end of stream error canceled the whole stream reading. which is a shame cause it could parse something worthwhile till then, like in this case.