Add ruby-specific compression name conversion API

include/grpc/compression_ruby.h

@@ -0,0 +1,48 @@
+/*
+ *
+ * Copyright 2017 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.
+ *
+ */
+
+#ifndef GRPC_COMPRESSION_H
+#define GRPC_COMPRESSION_H
+
+#include <grpc/impl/codegen/port_platform.h>
+
+#include <grpc/impl/codegen/compression_types.h>
+#include <grpc/slice.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** Parses the \a slice as a grpc_compression_algorithm instance and updating \a
+ * algorithm following algorithm names compatible with Ruby. Returns 1 upon
+ * success, 0 otherwise. */
+GRPCAPI int grpc_compression_algorithm_parse_ruby(
+    grpc_slice value, grpc_compression_algorithm *algorithm);
+
+/** Updates \a name with the encoding name corresponding to a valid \a
+ * algorithm. The \a name follows names compatible with Ruby. Note that \a name
+ * is statically allocated and must *not* be freed. Returns 1 upon success, 0
+ * otherwise. */
+GRPCAPI int grpc_compression_algorithm_name_ruby(
+    grpc_compression_algorithm algorithm, const char **name);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* GRPC_COMPRESSION_H */

src/core/lib/compression/compression_ruby.cc

@@ -0,0 +1,66 @@
+/*
+ *
+ * Copyright 2017 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 <grpc/compression_ruby.h>
+#include <grpc/support/useful.h>
+
+#include "src/core/lib/surface/api_trace.h"
+#include "src/core/lib/transport/static_metadata.h"
+
+int grpc_compression_algorithm_parse_ruby(
+    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_MESSAGE_DEFLATE;
+    return 1;
+  } else if (grpc_slice_eq(name, GRPC_MDSTR_GZIP)) {
+    *algorithm = GRPC_COMPRESS_MESSAGE_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_ruby(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_MESSAGE_DEFLATE:
+      *name = "deflate";
+      return 1;
+    case GRPC_COMPRESS_MESSAGE_GZIP:
+      *name = "gzip";
+      return 1;
+    case GRPC_COMPRESS_STREAM_GZIP:
+      *name = "stream/gzip";
+      return 1;
+    case GRPC_COMPRESS_ALGORITHMS_COUNT:
+      return 0;
+  }
+  return 0;
+}