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/*= -*- c-file-style: "bsd" -*-
* rproxy -- dynamic caching and delta update in HTTP
* $Id: copyq.c,v 1.16 2000/08/07 01:47:04 mbp Exp $
*
* Copyright (C) 1999, 2000 by Martin Pool <mbp@humbug.org.au>
* Copyright (C) 1999 by Andrew Tridgell
* Copyright (C) 1999-2000 by Peter Barker.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
#include "emit.h"
/* If possible, append this copy command to the end of the previous
* one. If not, flush the existing command and begin a new one. */
int
_hs_queue_copy(hs_write_fn_t write_fn, void *write_priv,
_hs_copyq_t * copyq,
off_t start, size_t len, hs_stats_t * stats)
{
int ret;
assert(start >= 0);
if (copyq->len == 0) {
copyq->start = start;
copyq->len = len;
return 0;
} else if (copyq->start + copyq->len == (size_t) start) {
copyq->len += len;
return 0;
} else {
/* Of course, COPY commands don't *have* to follow each other. If we
get two non-contiguous ones, then we flush and start again. */
ret = _hs_copyq_push(write_fn, write_priv, copyq, stats);
copyq->start = start;
copyq->len = len;
return ret;
}
}
/*
* If any copy commands are still waiting in the queue, then flush
* them out.
*/
int
_hs_copyq_push(hs_write_fn_t write_fn, void *write_priv,
_hs_copyq_t * copyq, hs_stats_t * stats)
{
int ret;
if (copyq->len == 0)
return 0;
assert(copyq->len > 0);
ret = _hs_emit_copy(write_fn, write_priv,
copyq->start, copyq->len, stats);
copyq->len = 0;
return ret;
}
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