1 files changed, 51 insertions, 0 deletions
diff --git a/rdiff-backup/src/myrdiff.py b/rdiff-backup/src/myrdiff.py
new file mode 100755
index 0000000..48485f7
--- /dev/null
+++ b/rdiff-backup/src/myrdiff.py
@@ -0,0 +1,51 @@
+#!/usr/bin/env python
+
+"""Like rdiff, but written in python and uses librsync module.
+
+Useful for benchmarking and testing of librsync and _librsync.
+
+"""
+
+import librsync, sys
+blocksize = 32768
+
+def makesig(inpath, outpath):
+	"""Write a signature of inpath at outpath"""
+	sf = librsync.SigFile(open(inpath, "rb"))
+	fout = open(outpath, "wb")
+	while 1:
+		buf = sf.read(blocksize)
+		if not buf: break
+		fout.write(buf)
+	assert not sf.close()
+	assert not fout.close()
+
+def makedelta(sigpath, newpath, deltapath):
+	"""Write delta at deltapath using signature at sigpath"""
+	df = librsync.DeltaFile(open(sigpath, "rb"), open(newpath, "rb"))
+	fout = open(deltapath, "wb")
+	while 1:
+		buf = df.read(blocksize)
+		if not buf: break
+		fout.write(buf)
+	assert not df.close()
+	assert not fout.close()
+
+def makepatch(basis_path, delta_path, new_path):
+	"""Write new given basis and delta"""
+	pf = librsync.PatchedFile(open(basis_path, "rb"), open(delta_path, "rb"))
+	fout = open(new_path, "wb")
+	while 1:
+		buf = pf.read(blocksize)
+		if not buf: break
+		fout.write(buf)
+	assert not pf.close()
+	assert not fout.close()
+
+if sys.argv[1] == "signature":
+	makesig(sys.argv[2], sys.argv[3])
+elif sys.argv[1] == "delta":
+	makedelta(sys.argv[2], sys.argv[3], sys.argv[4])
+elif sys.argv[1] == "patch":
+	makepatch(sys.argv[2], sys.argv[3], sys.argv[4])
+else: assert 0, "Bad mode argument %s" % (sys.argv[1],)