| /* |
| * |
| * 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); |
| } |