revlog: generate trivial deltas against null revision
To avoid extra memory usage and performance issues with large files,
generate a trivial delta header for deltas against the null revision
rather than calling the usual delta generator.
We append the delta header to meta rather than prepending it to data
to avoid a large allocate and copy.
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<p class="p1"><b>Before you install</b></p>
<p class="p2"><br></p>
<p class="p3">This is <i>not</i> a stand-alone version of Mercurial.</p>
<p class="p2"><br></p>
<p class="p3">To use it, you must have the appropriate version of Universal MacPython from <a href="http://www.python.org">www.python.org</a> installed.</p>
<p class="p2"><br></p>
<p class="p3">You can find more information and download MacPython from here:</p>
<p class="p4"><span class="s1"><a href="http://www.python.org/download">http://www.python.org/download</a></span></p>
<p class="p2"><br></p>
<p class="p3">Or direct links to the latest version are:</p>
<p class="p4"><span class="s1"><a href="http://www.python.org/ftp/python/2.5.1/python-2.5.1-macosx.dmg">Python 2.5.1 for Macintosh OS X</a></span></p>
<p class="p4"><span class="s1"><a href="http://www.python.org/ftp/python/2.4.4/python-2.4.4-macosx2006-10-18.dmg">Python 2.4.4 for Macintosh OS X</a></span></p>
<p class="p2"><br></p>
<p class="p1"><b>After you install</b></p>
<p class="p2"><br></p>
<p class="p3">This package installs the <span class="s2">hg</span> executable in <span class="s2">/Library/Frameworks/Python.framework/Versions/Current/bin</span>. This directory may not be in your shell's search path. The MacPython installer will have created an entry in <span class="s2">.profile</span> for it but if your shell doesn't use <span class="s2">.profile</span> you'll need configure it yourself or create a symlink from a directory already in your path.</p>
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<p class="p1"><b>Documentation</b></p>
<p class="p2"><br></p>
<p class="p3">Visit the <a href="http://www.selenic.com/mercurial">Mercurial web site and wiki</a></p>
<p class="p2"><br></p>
<p class="p3">There's also a free book, <a href="http://hgbook.red-bean.com/">Distributed revision control with Mercurial</a></p>
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<p class="p1"><b>Reporting problems</b></p>
<p class="p2"><br></p>
<p class="p3">If you run into any problems, please file a bug online:</p>
<p class="p3"><a href="http://www.selenic.com/mercurial/bts">http://www.selenic.com/mercurial/bts</a></p>
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