Mercurial > hg > pyhgsh
changeset 112:aea6562add6c
Make compression more intelligent:
- we don't attempt to compress things under 44 bytes (empirical)
- we check whether larger objects actually compress
- we tag objects to indicate their compression
NUL means uncompressed and starts with NUL
x means gzipped and starts with x (handy)
u means uncompressed, drop the u
| author | mpm@selenic.com |
|---|---|
| date | Fri, 20 May 2005 17:31:12 -0800 |
| parents | 2c80f6f8fc08 |
| children | 1918852a67a8 |
| files | mercurial/revlog.py |
| diffstat | 1 files changed, 15 insertions(+), 2 deletions(-) [+] |
line wrap: on
line diff
--- a/mercurial/revlog.py Fri May 20 17:28:09 2005 -0800 +++ b/mercurial/revlog.py Fri May 20 17:31:12 2005 -0800 @@ -16,10 +16,23 @@ def short(node): return hex(node[:4]) def compress(text): - return zlib.compress(text) + if not text: return text + if len(text) < 44: + if text[0] == '\0': return text + return 'u' + text + bin = zlib.compress(text) + if len(bin) > len(text): + if text[0] == '\0': return text + return 'u' + text + return bin def decompress(bin): - return zlib.decompress(bin) + if not bin: return bin + t = bin[0] + if t == '\0': return bin + if t == 'x': return zlib.decompress(bin) + if t == 'u': return bin[1:] + raise "unknown compression type %s" % t def hash(text, p1, p2): l = [p1, p2]