Move stream_compression to src/core/lib/compression

1 files changed, 97 insertions, 0 deletions

diff --git a/src/core/lib/compression/stream_compression.h b/src/core/lib/compression/stream_compression.h
new file mode 100644
index 0000000000..21ae2fd32d
--- /dev/null
+++ b/src/core/lib/compression/stream_compression.h
@@ -0,0 +1,97 @@
+/*
+ *
+ * Copyright 2017, 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.
+ *
+ */
+
+#ifndef GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRONSPORT_STREAM_COMPRESSION_H
+#define GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRONSPORT_STREAM_COMPRESSION_H
+
+#include <stdbool.h>
+
+#include <grpc/slice_buffer.h>
+#include <zlib.h>
+
+/* Stream compression/decompression context */
+typedef struct grpc_stream_compression_context {
+  z_stream zs;
+  int (*flate)(z_stream *zs, int flush);
+} grpc_stream_compression_context;
+
+typedef enum grpc_stream_compression_method {
+  GRPC_STREAM_COMPRESSION_COMPRESS,
+  GRPC_STREAM_COMPRESSION_DECOMPRESS
+} grpc_stream_compression_method;
+
+typedef enum grpc_stream_compression_flush {
+  GRPC_STREAM_COMPRESSION_FLUSH_NONE,
+  GRPC_STREAM_COMPRESSION_FLUSH_SYNC,
+  GRPC_STREAM_COMPRESSION_FLUSH_FINISH
+} grpc_stream_compression_flush;
+
+/**
+ * Compress bytes provided in \a in with a given context, with an optional flush
+ * at the end of compression. Emits at most \a max_output_size compressed bytes
+ * into \a out. If all the bytes in input buffer \a in are depleted and \a flush
+ * is not GRPC_STREAM_COMPRESSION_FLUSH_NONE, the corresponding flush method is
+ * executed. The total number of bytes emitted is outputed in \a output_size.
+ */
+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);
+
+/**
+ * Decompress bytes provided in \a in with a given context. Emits at most \a
+ * max_output_size decompressed bytes into \a out. If decompression process
+ * reached the end of a gzip stream, \a end_of_context is set to true; otherwise
+ * it is set to false. The total number of bytes emitted is outputed in \a
+ * output_size.
+ */
+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);
+
+/**
+ * Creates a stream compression context. \a pending_bytes_buffer is the input
+ * buffer for compression/decompression operations. \a method specifies whether
+ * the context is for compression or decompression.
+ */
+grpc_stream_compression_context *grpc_stream_compression_context_create(
+    grpc_stream_compression_method method);
+
+/**
+ * Destroys a stream compression context.
+ */
+void grpc_stream_compression_context_destroy(
+    grpc_stream_compression_context *ctx);
+
+#endif