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/*
*
* 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
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* 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,
char **name) {
GRPC_API_TRACE("grpc_compression_algorithm_parse(algorithm=%d, name=%p)", 2,
((int)algorithm, name));
switch (algorithm) {
case GRPC_COMPRESS_NONE:
*name = "identity";
return 1;
case GRPC_COMPRESS_DEFLATE:
*name = "deflate";
return 1;
case GRPC_COMPRESS_GZIP:
*name = "gzip";
return 1;
case GRPC_COMPRESS_ALGORITHMS_COUNT:
return 0;
}
return 0;
}
grpc_compression_algorithm grpc_compression_algorithm_from_mdstr(
grpc_mdstr *str) {
if (str == GRPC_MDSTR_IDENTITY) return GRPC_COMPRESS_NONE;
if (str == GRPC_MDSTR_DEFLATE) return GRPC_COMPRESS_DEFLATE;
if (str == GRPC_MDSTR_GZIP) return GRPC_COMPRESS_GZIP;
return GRPC_COMPRESS_ALGORITHMS_COUNT;
}
grpc_mdstr *grpc_compression_algorithm_mdstr(
grpc_compression_algorithm algorithm) {
switch (algorithm) {
case GRPC_COMPRESS_NONE:
return GRPC_MDSTR_IDENTITY;
case GRPC_COMPRESS_DEFLATE:
return GRPC_MDSTR_DEFLATE;
case GRPC_COMPRESS_GZIP:
return GRPC_MDSTR_GZIP;
case GRPC_COMPRESS_ALGORITHMS_COUNT:
return NULL;
}
return NULL;
}
grpc_mdelem *grpc_compression_encoding_mdelem(
grpc_compression_algorithm algorithm) {
switch (algorithm) {
case GRPC_COMPRESS_NONE:
return GRPC_MDELEM_GRPC_ENCODING_IDENTITY;
case GRPC_COMPRESS_DEFLATE:
return GRPC_MDELEM_GRPC_ENCODING_DEFLATE;
case GRPC_COMPRESS_GZIP:
return GRPC_MDELEM_GRPC_ENCODING_GZIP;
default:
break;
}
return NULL;
}
/* TODO(dgq): Add the ability to specify parameters to the individual
* compression algorithms */
grpc_compression_algorithm grpc_compression_algorithm_for_level(
grpc_compression_level level) {
GRPC_API_TRACE("grpc_compression_algorithm_for_level(level=%d)", 1,
((int)level));
switch (level) {
case GRPC_COMPRESS_LEVEL_NONE:
return GRPC_COMPRESS_NONE;
case GRPC_COMPRESS_LEVEL_LOW:
case GRPC_COMPRESS_LEVEL_MED:
case GRPC_COMPRESS_LEVEL_HIGH:
return GRPC_COMPRESS_DEFLATE;
default:
gpr_log(GPR_ERROR, "Unknown compression level %d.", (int)level);
abort();
}
}
void grpc_compression_options_init(grpc_compression_options *opts) {
opts->enabled_algorithms_bitset = (1u << GRPC_COMPRESS_ALGORITHMS_COUNT) - 1;
opts->default_compression_algorithm = GRPC_COMPRESS_NONE;
}
void grpc_compression_options_enable_algorithm(
grpc_compression_options *opts, grpc_compression_algorithm algorithm) {
GPR_BITSET(&opts->enabled_algorithms_bitset, algorithm);
}
void grpc_compression_options_disable_algorithm(
grpc_compression_options *opts, grpc_compression_algorithm algorithm) {
GPR_BITCLEAR(&opts->enabled_algorithms_bitset, algorithm);
}
int grpc_compression_options_is_algorithm_enabled(
const grpc_compression_options *opts,
grpc_compression_algorithm algorithm) {
return GPR_BITGET(opts->enabled_algorithms_bitset, algorithm);
}
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