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RE: SVN Protocol

From: Ramprasad Venkata Inala <rinala_at_cordys.com>
Date: 2005-07-06 12:47:00 CEST

Hi Ben,

As you had suggested I have started using the JNI to achieve the svndiff
I followed the document at
to write the code to achieve sending of deltas first.

The following are the steps mentioned in document and my implementation

Step 1.

txdelta_stream = svn_txdelta (source_stream, target_stream);

My Implementation:
pool = svn_pool_create (NULL);
src_buf = svn_stringbuf_create( "h", pool );
tgt_buf = svn_stringbuf_create( "", pool );
src_stream = svn_stream_from_stringbuf(
src_buf, pool );
tgt_stream = svn_stream_from_stringbuf(
tgt_buf, pool );
svn_txdelta (&txdelta_stream, src_stream, tgt_stream, pool);

Step 2.

Get window handler to do something with delta. If using an
"editor" to transmit information:

window_consumer_func = editor->apply_textdelta (file_baton);

If you want raw vcdiff data for embedding in XML or HTTP

window_consumer_func = svn_txdelta_to_vcdiff (txdelta_stream);

My Implementation:

encoder = svn_base64_encode_string(
svn_string_create_from_buf(src_buf,pool), pool );

svn_txdelta_to_svndiff (encoder, pool, &svndiff_handler,

Step 3 And 4

Loop until there are no more windows:
txdelta_window = svn_txdelta_next_window (txdelta_stream);
window_consumer_func (txdelta_window);
svn_txdelta_free_window (txdelta_window);

Be sure to call window_consumer_func with a NULL window when there
are no more windows to consume.

svn_txdelta_free (txdelta_stream);

My Implementation:

err = svn_txdelta_send_txstream (txdelta_stream,

return (*env)->NewStringUTF(env, encoder->data);

I should return a data that has been encoded in svn format to the java
program hence the above statement.

I am not sure that what I have written I correct. Please correct me if I
am wrong.
Also attached are the files used.
Please let me know how to send the data back to java should be as string
or a byte array.

-----Original Message-----
From: Ben Collins-Sussman [mailto:sussman@collab.net]
Sent: Tuesday, June 28, 2005 7:36 PM
To: Ramprasad Venkata Inala
Cc: Max Bowsher; dev@subversion.tigris.org
Subject: Re: SVN Protocol

On Jun 28, 2005, at 12:23 AM, Ramprasad Venkata Inala wrote:

> I am making a mistake some where or my understanding is wrong. Please
> correct me and also provide exact sequence of bytes .

Why are you trying to re-implement the whole binary differencing
language? Why not just use the public API for encoding/decoding
binary differences as provided by the public API in svn_delta.h?
Wouldn't it be easier to make JNI calls to libsvn_delta, rather than
reimplement everything?

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Received on Wed Jul 6 12:48:06 2005

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