mirror of
https://github.com/openvswitch/ovs
synced 2025-08-22 01:51:26 +00:00
7b1ce8e2a0
Add helper to truncate the buffer to certain size which might be useful if some earlier part of the buffer can be reused multiple times without copying the whole buffer. Signed-off-by: Ales Musil <amusil@redhat.com> Signed-off-by: Ilya Maximets <i.maximets@ovn.org>
77 lines
2.6 KiB
C
77 lines
2.6 KiB
C
/*
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* Copyright (c) 2015 Nicira, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <config.h>
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#undef NDEBUG
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#include <stdio.h>
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#include "openvswitch/ofpbuf.h"
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#include "ovstest.h"
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#include "util.h"
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#define BUF_SIZE 100
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#define HDR_OFS 10
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#define MSG_OFS 50
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#define DATA_SIZE 16
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static void
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test_ofpbuf_main(int argc OVS_UNUSED, char *argv[] OVS_UNUSED)
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{
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struct ofpbuf *buf = ofpbuf_new(BUF_SIZE);
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int exit_code = 0;
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/* Init checks. */
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ovs_assert(!buf->size);
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ovs_assert(buf->allocated == BUF_SIZE);
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ovs_assert(buf->base == buf->data);
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/* Sets 'buf->header' and 'buf->msg'. */
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buf->header = (char *) buf->base + HDR_OFS;
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buf->msg = (char *) buf->base + MSG_OFS;
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/* Gets another 'BUF_SIZE' bytes headroom. */
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ofpbuf_prealloc_headroom(buf, BUF_SIZE);
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ovs_assert(!buf->size);
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ovs_assert(buf->allocated == 2 * BUF_SIZE);
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ovs_assert((char *) buf->base + BUF_SIZE == buf->data);
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/* Now 'buf->header' and 'buf->msg' must be BUF_SIZE away from
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* their original offsets. */
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ovs_assert(buf->header == (char *) buf->base + BUF_SIZE + HDR_OFS);
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ovs_assert(buf->msg == (char *) buf->base + BUF_SIZE + MSG_OFS);
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/* Gets another 'BUF_SIZE' bytes tailroom. */
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ofpbuf_prealloc_tailroom(buf, BUF_SIZE);
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/* Must remain unchanged. */
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ovs_assert(!buf->size);
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ovs_assert(buf->allocated == 2 * BUF_SIZE);
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ovs_assert((char *) buf->base + BUF_SIZE == buf->data);
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ovs_assert(buf->header == (char *) buf->base + BUF_SIZE + HDR_OFS);
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ovs_assert(buf->msg == (char *) buf->base + BUF_SIZE + MSG_OFS);
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size_t prev_size = buf->size;
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ofpbuf_put_uninit(buf, DATA_SIZE);
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ofpbuf_truncate(buf, prev_size);
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/* Check that everything else is unchanged after truncate. */
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ovs_assert(!buf->size);
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ovs_assert((char *) buf->base + BUF_SIZE == buf->data);
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ovs_assert(buf->header == (char *) buf->base + BUF_SIZE + HDR_OFS);
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ovs_assert(buf->msg == (char *) buf->base + BUF_SIZE + MSG_OFS);
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ofpbuf_delete(buf);
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exit(exit_code);
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}
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OVSTEST_REGISTER("test-ofpbuf", test_ofpbuf_main);
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