# HG changeset patch
# User Alexis S. L. Carvalho <alexis@cecm.usp.br>
# Date 1146116527 25200
# Node ID f5046cab9e2e53fd6d1d1109073d6674297f64cd
# Parent  5fefab118f7ec4b45e2d35d001471f2083ea2c9c
Fix revlog-ng interaction with old-http.

revlog.py wasn't trying to detect the version of a revlog file that
doesn't exist on the filesystem (as is the case with old-http).

Additionally, there was an off-by-one error in httprangereader.read
(ranges in HTTP Range headers are inclusive), making it get more data
than what was asked for.  This made a struct.unpack complain that
"unpack str size does not match format".

Finally, with the two fixes above, test-static-http fails, since
BaseHTTPServer doesn't understand ranges and returns too much data.
Work around that by reading only the specified amount.



diff --git a/mercurial/httprangereader.py b/mercurial/httprangereader.py
--- a/mercurial/httprangereader.py
+++ b/mercurial/httprangereader.py
@@ -18,7 +18,8 @@ class httprangereader(object):
         urllib2.install_opener(opener)
         req = urllib2.Request(self.url)
         end = ''
-        if bytes: end = self.pos + bytes
+        if bytes:
+            end = self.pos + bytes - 1
         req.add_header('Range', 'bytes=%d-%s' % (self.pos, end))
         f = urllib2.urlopen(req)
-        return f.read()
+        return f.read(bytes)
diff --git a/mercurial/revlog.py b/mercurial/revlog.py
--- a/mercurial/revlog.py
+++ b/mercurial/revlog.py
@@ -333,8 +333,8 @@ class revlog(object):
                     and st.st_ctime == oldst.st_ctime):
                     return
                 self.indexstat = st
-                if len(i) > 0:
-                    v = struct.unpack(versionformat, i)[0]
+            if len(i) > 0:
+                v = struct.unpack(versionformat, i)[0]
         flags = v & ~0xFFFF
         fmt = v & 0xFFFF
         if fmt == 0: