Mercurial > hg
comparison mercurial/revlog.py @ 31356:ef6888172437
revlog: extract first byte of revlog with a slice so it's portable
| author | Augie Fackler <augie@google.com> |
|---|---|
| date | Sun, 12 Mar 2017 00:49:49 -0500 |
| parents | 08b34c3a6f74 |
| children | c233cbda5b1e |
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| 31355:77270ec0cdd9 | 31356:ef6888172437 |
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| 1519 # compression engines." That is why we have the inline lookup first | 1519 # compression engines." That is why we have the inline lookup first |
| 1520 # followed by the compengines lookup. | 1520 # followed by the compengines lookup. |
| 1521 # | 1521 # |
| 1522 # According to `hg perfrevlogchunks`, this is ~0.5% faster for zlib | 1522 # According to `hg perfrevlogchunks`, this is ~0.5% faster for zlib |
| 1523 # compressed chunks. And this matters for changelog and manifest reads. | 1523 # compressed chunks. And this matters for changelog and manifest reads. |
| 1524 t = data[0] | 1524 t = data[0:1] |
| 1525 | 1525 |
| 1526 if t == 'x': | 1526 if t == 'x': |
| 1527 try: | 1527 try: |
| 1528 return _zlibdecompress(data) | 1528 return _zlibdecompress(data) |
| 1529 except zlib.error as e: | 1529 except zlib.error as e: |