Questions about the Delta

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Hi,everyone.
I get the intro from http://librsync.sourcefrog.net/doc/rdiff.html,which is rather useful.
B generates the rdiff signature of A1. Call this S1. B sends the signature to A. (The signature is usually much smaller than the file it describes.) 
A computes the rdiff delta between S1 and A2. Call this delta D. A sends the delta to B. 
B applies the delta to recreate A2. 
When I try to do step 2, which produces the delta. However, the size of delta is same(or small larger) to the original file. I am confused.
Thanks in advance.
Michael 
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<DIV>Hi,everyone.</DIV>
<DIV>I get the intro from <A href=3D"http://librsync.sourcefrog.net/doc/rdi=
ff.html,which">http://librsync.sourcefrog.net/doc/rdiff.html,which</A> is r=
ather useful.</DIV>
<OL class=3D"arabic simple">
<LI>B generates the rdiff signature of <EM>A1</EM>. Call this <EM>S1</EM>. =
B sends the signature to A. (The signature is usually much smaller than the=
 file it describes.)=20
</LI><LI>A computes the rdiff delta between <EM>S1</EM> and <EM>A2</EM>. Ca=
ll this delta <EM>D</EM>. A sends the delta to B.=20
</LI><LI>B applies the delta to recreate <EM>A2</EM>. </LI></OL>
<DIV>When I try to do step 2, which produces the delta. However, the size o=
f delta is same(or small larger) to the original file. I&nbsp;am confused.<=
/DIV>
<DIV>Thanks in advance.</DIV>
<DIV>Michael&nbsp;</DIV><br><!-- footer --><br><span title=3D"neteasefooter=
"/><hr/>
<a href=3D"http://count.mail.163.com/redirect/footer.htm?f=3Dhttp://gouwu.y=
oudao.com">200=CD=F2=D6=D6=C9=CC=C6=B7,=D7=EE=B5=CD=BC=DB=B8=F1,=B7=E8=BF=
=F1=D3=D5=BB=F3=C4=E3</a>
</span>
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