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chunky parser: only rewind if needed

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The code reading chunked encoding attempts to rewind the code if it had
read more data than the chunky parser consumes. The rewinding can fail
and it will then cause an error. This change now makes the rewinding
only happen if pipelining is in use - as that's the only time it really
needs to be done.

Bug: http://curl.haxx.se/mail/lib-2010-08/0297.html
Reported by: Ron Parker
This commit is contained in:
Daniel Stenberg 2010-09-07 18:22:54 +02:00
parent 7aea2d522d
commit 18a758d907
1 changed files with 6 additions and 3 deletions
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9
lib/transfer.c
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@ -594,9 +594,12 @@ static CURLcode readwrite_data(struct SessionHandle *data,
dataleft = conn->chunk.dataleft;
if(dataleft != 0) {
infof(conn->data, "Leftovers after chunking. "
" Rewinding %zu bytes\n",dataleft);
read_rewind(conn, dataleft);
infof(conn->data, "Leftovers after chunking: %zu bytes", dataleft);
if(conn->data->multi && Curl_multi_canPipeline(conn->data->multi)) {
/* only attempt the rewind if we truly are pipelining */
infof(conn->data, "Rewinding %zu bytes\n",dataleft);
read_rewind(conn, dataleft);
}
}
}
/* If it returned OK, we just keep going */