# HG changeset patch
# User Matt Mackall <mpm@selenic.com>
# Date 2010-08-25 20:33:06
# Node ID 210049a8d16e25e6fe56bd8940b41eed9e38743c
# Parent  270fb4d39153afbadce2c2b38383f4b82826c247

bundle: unify/refactor unbundle/readbundle

diff --git a/mercurial/changegroup.py b/mercurial/changegroup.py
--- a/mercurial/changegroup.py
+++ b/mercurial/changegroup.py
@@ -138,24 +138,24 @@ def decompressor(fh, alg):
         raise util.Abort("unknown bundle compression '%s'" % alg)
     return generator(fh)
 
-def unbundle(header, fh):
-    if not header.startswith('HG'):
-        def fixup(f, h):
-            yield h
-            for x in f:
-                yield x
-        fh = fixup(f, h)
-        header = "HG10UN"
-
-    alg = header[4:6]
-    return util.chunkbuffer(decompressor(fh, alg))
-
 def readbundle(fh, fname):
     header = fh.read(6)
-    if not header.startswith('HG'):
-        raise util.Abort(_('%s: not a Mercurial bundle file') % fname)
-    if not header.startswith('HG10'):
-        raise util.Abort(_('%s: unknown bundle version') % fname)
-    elif header not in bundletypes:
-        raise util.Abort(_('%s: unknown bundle compression type') % fname)
-    return unbundle(header, fh)
+
+    if not fname:
+        fname = "stream"
+        if not header.startswith('HG') and header.startswith('\0'):
+            # headerless bundle, clean things up
+            def fixup(f, h):
+                yield h
+                for x in f:
+                    yield x
+            fh = fixup(fh, header)
+            header = "HG10UN"
+
+    magic, version, alg = header[0:2], header[2:4], header[4:6]
+
+    if magic != 'HG':
+        raise util.Abort(_('%s: not a Mercurial bundle') % fname)
+    if version != '10':
+        raise util.Abort(_('%s: unknown bundle version %s') % (fname, version))
+    return util.chunkbuffer(decompressor(fh, alg))
diff --git a/mercurial/wireproto.py b/mercurial/wireproto.py
--- a/mercurial/wireproto.py
+++ b/mercurial/wireproto.py
@@ -294,13 +294,7 @@ def unbundle(repo, proto, heads):
 
             # push can proceed
             fp.seek(0)
-            header = fp.read(6)
-            if header.startswith('HG'):
-                if not header.startswith('HG10'):
-                    raise ValueError('unknown bundle version')
-                elif header not in changegroupmod.bundletypes:
-                    raise ValueError('unknown bundle compression type')
-            gen = changegroupmod.unbundle(header, fp)
+            gen = changegroupmod.readbundle(fp, None)
 
             try:
                 r = repo.addchangegroup(gen, 'serve', proto._client(),