1 files changed, 77 insertions, 0 deletions
diff --git a/src/core/lib/compression/stream_compression.cc b/src/core/lib/compression/stream_compression.cc
new file mode 100644
index 0000000000..411489f029
--- /dev/null
+++ b/src/core/lib/compression/stream_compression.cc
@@ -0,0 +1,77 @@
+/*
+ *
+ * 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/support/log.h>
+
+#include "src/core/lib/compression/stream_compression.h"
+#include "src/core/lib/compression/stream_compression_gzip.h"
+
+extern const grpc_stream_compression_vtable
+    grpc_stream_compression_identity_vtable;
+
+bool grpc_stream_compress(grpc_stream_compression_context *ctx,
+                          grpc_slice_buffer *in, grpc_slice_buffer *out,
+                          size_t *output_size, size_t max_output_size,
+                          grpc_stream_compression_flush flush) {
+  return ctx->vtable->compress(ctx, in, out, output_size, max_output_size,
+                               flush);
+}
+
+bool grpc_stream_decompress(grpc_stream_compression_context *ctx,
+                            grpc_slice_buffer *in, grpc_slice_buffer *out,
+                            size_t *output_size, size_t max_output_size,
+                            bool *end_of_context) {
+  return ctx->vtable->decompress(ctx, in, out, output_size, max_output_size,
+                                 end_of_context);
+}
+
+grpc_stream_compression_context *grpc_stream_compression_context_create(
+    grpc_stream_compression_method method) {
+  switch (method) {
+    case GRPC_STREAM_COMPRESSION_IDENTITY_COMPRESS:
+    case GRPC_STREAM_COMPRESSION_IDENTITY_DECOMPRESS:
+      return grpc_stream_compression_identity_vtable.context_create(method);
+    case GRPC_STREAM_COMPRESSION_GZIP_COMPRESS:
+    case GRPC_STREAM_COMPRESSION_GZIP_DECOMPRESS:
+      return grpc_stream_compression_gzip_vtable.context_create(method);
+    default:
+      gpr_log(GPR_ERROR, "Unknown stream compression method: %d", method);
+      return NULL;
+  }
+}
+
+void grpc_stream_compression_context_destroy(
+    grpc_stream_compression_context *ctx) {
+  ctx->vtable->context_destroy(ctx);
+}
+
+int grpc_stream_compression_method_parse(
+    grpc_slice value, bool is_compress,
+    grpc_stream_compression_method *method) {
+  if (grpc_slice_eq(value, GRPC_MDSTR_IDENTITY)) {
+    *method = is_compress ? GRPC_STREAM_COMPRESSION_IDENTITY_COMPRESS
+                          : GRPC_STREAM_COMPRESSION_IDENTITY_DECOMPRESS;
+    return 1;
+  } else if (grpc_slice_eq(value, GRPC_MDSTR_GZIP)) {
+    *method = is_compress ? GRPC_STREAM_COMPRESSION_GZIP_COMPRESS
+                          : GRPC_STREAM_COMPRESSION_GZIP_DECOMPRESS;
+    return 1;
+  } else {
+    return 0;
+  }
+}