third_party/grpc/src/core/transport/chttp2/alpn.c

/*
 *
 * Copyright 2015, Google Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */

#include "src/core/transport/chttp2/alpn.h"
#include <grpc/support/log.h>
#include <grpc/support/useful.h>

/* in order of preference */
static const char *const supported_versions[] = {"h2"};

int grpc_chttp2_is_alpn_version_supported(const char *version, size_t size) {
  size_t i;
  for (i = 0; i < GPR_ARRAY_SIZE(supported_versions); i++) {
    if (!strncmp(version, supported_versions[i], size)) return 1;
  }
  return 0;
}

size_t grpc_chttp2_num_alpn_versions(void) {
  return GPR_ARRAY_SIZE(supported_versions);
}

const char *grpc_chttp2_get_alpn_version_index(size_t i) {
  GPR_ASSERT(i < GPR_ARRAY_SIZE(supported_versions));
  return supported_versions[i];
}