algorithm.c

/*
 *
 * Copyright 2015-2016, 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.
 *
 */

#include <stdlib.h>
#include <string.h>

#include <grpc/compression.h>
#include <grpc/support/useful.h>

#include "src/core/compression/algorithm_metadata.h"
#include "src/core/surface/api_trace.h"
#include "src/core/transport/static_metadata.h"

int grpc_compression_algorithm_parse(const char *name, size_t name_length,
                                     grpc_compression_algorithm *algorithm) {
  /* we use strncmp not only because it's safer (even though in this case it
   * doesn't matter, given that we are comparing against string literals, but
   * because this way we needn't have "name" nil-terminated (useful for slice
   * data, for example) */
  GRPC_API_TRACE(
      "grpc_compression_algorithm_parse("
      "name=%*.*s, name_length=%lu, algorithm=%p)",
      5, ((int)name_length, (int)name_length, name, (unsigned long)name_length,
          algorithm));
  if (name_length == 0) {
    return 0;
  }
  if (strncmp(name, "identity", name_length) == 0) {
    *algorithm = GRPC_COMPRESS_NONE;
  } else if (strncmp(name, "gzip", name_length) == 0) {
    *algorithm = GRPC_COMPRESS_GZIP;
  } else if (strncmp(name, "deflate", name_length) == 0) {
    *algorithm = GRPC_COMPRESS_DEFLATE;
  } else {
    return 0;
  }
  return 1;
}

int grpc_compression_algorithm_name(grpc_compression_algorithm algorithm,