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/*
*
* Copyright 2015 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include <stdlib.h>
#include <string.h>
#include <grpc/compression.h>
#include "src/core/lib/compression/algorithm_metadata.h"
#include "src/core/lib/compression/compression_internal.h"
#include "src/core/lib/gpr/useful.h"
#include "src/core/lib/surface/api_trace.h"
#include "src/core/lib/transport/static_metadata.h"
int grpc_compression_algorithm_is_message(
grpc_compression_algorithm algorithm) {
return (algorithm >= GRPC_COMPRESS_DEFLATE && algorithm <= GRPC_COMPRESS_GZIP)
? 1
: 0;
}
int grpc_compression_algorithm_is_stream(grpc_compression_algorithm algorithm) {
return (algorithm == GRPC_COMPRESS_STREAM_GZIP) ? 1 : 0;
}
int grpc_compression_algorithm_parse(grpc_slice name,
grpc_compression_algorithm* algorithm) {
if (grpc_slice_eq(name, GRPC_MDSTR_IDENTITY)) {
*algorithm = GRPC_COMPRESS_NONE;
return 1;
} else if (grpc_slice_eq(name, GRPC_MDSTR_DEFLATE)) {
*algorithm = GRPC_COMPRESS_DEFLATE;
return 1;
} else if (grpc_slice_eq(name, GRPC_MDSTR_GZIP)) {
*algorithm = GRPC_COMPRESS_GZIP;
return 1;
} else if (grpc_slice_eq(name, GRPC_MDSTR_STREAM_SLASH_GZIP)) {
*algorithm = GRPC_COMPRESS_STREAM_GZIP;
return 1;
} else {
return 0;
}
return 0;
}
int grpc_compression_algorithm_name(grpc_compression_algorithm algorithm,
const 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_STREAM_GZIP:
*name = "stream/gzip";
return 1;
case GRPC_COMPRESS_ALGORITHMS_COUNT:
return 0;
}
return 0;
}
grpc_compression_algorithm grpc_compression_algorithm_for_level(
grpc_compression_level level, uint32_t accepted_encodings) {
grpc_compression_algorithm algo;
if (level == GRPC_COMPRESS_LEVEL_NONE) {
return GRPC_COMPRESS_NONE;
} else if (level <= GRPC_COMPRESS_LEVEL_HIGH) {
// TODO(mxyan): Design algorithm to select from all algorithms, including
// stream compression algorithm
if (!grpc_compression_algorithm_from_message_stream_compression_algorithm(
&algo,
grpc_message_compression_algorithm_for_level(
level,
grpc_compression_bitset_to_message_bitset(accepted_encodings)),
static_cast<grpc_stream_compression_algorithm>(0))) {
gpr_log(GPR_ERROR, "Parse compression level error");
return GRPC_COMPRESS_NONE;
}
return algo;
} else {
gpr_log(GPR_ERROR, "Unknown compression level: %d", level);
return GRPC_COMPRESS_NONE;
}
}
void grpc_compression_options_init(grpc_compression_options* opts) {
memset(opts, 0, sizeof(*opts));
/* all enabled by default */
opts->enabled_algorithms_bitset = (1u << GRPC_COMPRESS_ALGORITHMS_COUNT) - 1;
}
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);
}
grpc_slice grpc_compression_algorithm_slice(
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_STREAM_GZIP:
return GRPC_MDSTR_STREAM_SLASH_GZIP;
case GRPC_COMPRESS_ALGORITHMS_COUNT:
return grpc_empty_slice();
}
return grpc_empty_slice();
}
grpc_compression_algorithm grpc_compression_algorithm_from_slice(
grpc_slice str) {
if (grpc_slice_eq(str, GRPC_MDSTR_IDENTITY)) return GRPC_COMPRESS_NONE;
if (grpc_slice_eq(str, GRPC_MDSTR_DEFLATE)) return GRPC_COMPRESS_DEFLATE;
if (grpc_slice_eq(str, GRPC_MDSTR_GZIP)) return GRPC_COMPRESS_GZIP;
if (grpc_slice_eq(str, GRPC_MDSTR_STREAM_SLASH_GZIP))
return GRPC_COMPRESS_STREAM_GZIP;
return GRPC_COMPRESS_ALGORITHMS_COUNT;
}
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;
case GRPC_COMPRESS_STREAM_GZIP:
return GRPC_MDELEM_GRPC_ENCODING_GZIP;
default:
break;
}
return GRPC_MDNULL;
}
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