| /* |
| * |
| * Copyright 2015, 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> |
| |
| 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) */ |
| if (name_length == 0) { |
| return 0; |
| } |
| if (strncmp(name, "none", 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) { |
| switch (algorithm) { |
| case GRPC_COMPRESS_NONE: |
| *name = "none"; |
| break; |
| case GRPC_COMPRESS_DEFLATE: |
| *name = "deflate"; |
| break; |
| case GRPC_COMPRESS_GZIP: |
| *name = "gzip"; |
| break; |
| default: |
| return 0; |
| } |
| return 1; |
| } |
| |
| /* 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) { |
| 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: |
| /* we shouldn't be making it here */ |
| abort(); |
| } |
| } |
| |
| grpc_compression_level grpc_compression_level_for_algorithm( |
| grpc_compression_algorithm algorithm) { |
| grpc_compression_level clevel; |
| for (clevel = GRPC_COMPRESS_LEVEL_NONE; clevel < GRPC_COMPRESS_LEVEL_COUNT; |
| ++clevel) { |
| if (grpc_compression_algorithm_for_level(clevel) == algorithm) { |
| return clevel; |
| } |
| } |
| abort(); |
| } |