Pyiostream improvements #61
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Make pyiostream faster on Windows.
The HepMC3 code expects
\nas linefeed character, even on Windows. To improve performance, we let Python read the raw bytestream and correct\r\nto\nin pyiostream, by manipulating the view on the internal buffer.I previously used rewrite large parts of the internal buffer to perform this replacement, but now I manipulate only a few bytes and skip characters by manipulating the view. The new version should be faster.
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