| /* |
| * |
| * 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 <grpc/support/useful.h> |
| |
| #include "src/core/lib/compression/algorithm_metadata.h" |
| #include "src/core/lib/compression/compression_internal.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; |
| } |