[PATCH v3] Add description of OFS_DELTA to the pack format description

["Peter Eriksen" <s022018@student.dtu.dk>]

Signed-off-by: Peter Eriksen <s022018@student.dtu.dk>
---
 Documentation/technical/pack-format.txt |   16 +++++++++++++++-
 1 files changed, 15 insertions(+), 1 deletions(-)

diff --git a/Documentation/technical/pack-format.txt b/Documentation/technical/pack-format.txt
index aa87756..6b2170f 100644
--- a/Documentation/technical/pack-format.txt
+++ b/Documentation/technical/pack-format.txt
@@ -103,10 +103,24 @@ Pack file entry: <+
      packed object data:
         If it is not DELTA, then deflated bytes (the size above
 		is the size before compression).
-	If it is DELTA, then
+	If it is REF_DELTA, then
 	  20-byte base object name SHA1 (the size above is the
 		size of the delta data that follows).
           delta data, deflated.
+	If it is OFS_DELTA, then
+	  n-byte offset (see below) interpreted as a negative
+                offset from the type-byte of the header of the
+                ofs-delta entry (the size above is the size of
+                the delta data that follows).
+          delta data, deflated.
+
+     offset encoding:
+          n bytes with MSB set in all but the last one.
+          The offset is then the number constructed by
+          concatenating the lower 7 bit of each byte, and
+          for n >= 2 adding 2^7 + 2^14 + ... + 2^(7*(n-1))
+          to the result.
+          
 
 
 = Version 2 pack-*.idx files support packs larger than 4 GiB, and
-- 
1.5.5-rc3.GIT