Built motion from commit 6a09e18b.|2.6.11

[motion2.git] / legacy-libs / grpc-cloned / deps / grpc / src / core / ext / transport / chttp2 / transport / hpack_encoder.h

diff --git a/legacy-libs/grpc-cloned/deps/grpc/src/core/ext/transport/chttp2/transport/hpack_encoder.h b/legacy-libs/grpc-cloned/deps/grpc/src/core/ext/transport/chttp2/transport/hpack_encoder.h
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+/*
+ *
+ * Copyright 2015 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_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_HPACK_ENCODER_H
+#define GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_HPACK_ENCODER_H
+
+#include <grpc/support/port_platform.h>
+
+#include <grpc/slice.h>
+#include <grpc/slice_buffer.h>
+#include "src/core/ext/transport/chttp2/transport/frame.h"
+#include "src/core/lib/transport/metadata.h"
+#include "src/core/lib/transport/metadata_batch.h"
+#include "src/core/lib/transport/transport.h"
+
+// This should be <= 8. We use 6 to save space.
+#define GRPC_CHTTP2_HPACKC_NUM_VALUES_BITS 6
+#define GRPC_CHTTP2_HPACKC_NUM_VALUES (1 << GRPC_CHTTP2_HPACKC_NUM_VALUES_BITS)
+/* initial table size, per spec */
+#define GRPC_CHTTP2_HPACKC_INITIAL_TABLE_SIZE 4096
+/* maximum table size we'll actually use */
+#define GRPC_CHTTP2_HPACKC_MAX_TABLE_SIZE (1024 * 1024)
+
+extern grpc_core::TraceFlag grpc_http_trace;
+
+typedef struct {
+  uint32_t filter_elems_sum;
+  uint32_t max_table_size;
+  uint32_t max_table_elems;
+  uint32_t cap_table_elems;
+  /** if non-zero, advertise to the decoder that we'll start using a table
+      of this size */
+  uint8_t advertise_table_size_change;
+  /** maximum number of bytes we'll use for the decode table (to guard against
+      peers ooming us by setting decode table size high) */
+  uint32_t max_usable_size;
+  /* one before the lowest usable table index */
+  uint32_t tail_remote_index;
+  uint32_t table_size;
+  uint32_t table_elems;
+
+  /* filter tables for elems: this tables provides an approximate
+     popularity count for particular hashes, and are used to determine whether
+     a new literal should be added to the compression table or not.
+     They track a single integer that counts how often a particular value has
+     been seen. When that count reaches max (255), all values are halved. */
+  uint8_t filter_elems[GRPC_CHTTP2_HPACKC_NUM_VALUES];
+
+  /* entry tables for keys & elems: these tables track values that have been
+     seen and *may* be in the decompressor table */
+  grpc_slice entries_keys[GRPC_CHTTP2_HPACKC_NUM_VALUES];
+  grpc_mdelem entries_elems[GRPC_CHTTP2_HPACKC_NUM_VALUES];
+  uint32_t indices_keys[GRPC_CHTTP2_HPACKC_NUM_VALUES];
+  uint32_t indices_elems[GRPC_CHTTP2_HPACKC_NUM_VALUES];
+
+  uint16_t* table_elem_size;
+} grpc_chttp2_hpack_compressor;
+
+void grpc_chttp2_hpack_compressor_init(grpc_chttp2_hpack_compressor* c);
+void grpc_chttp2_hpack_compressor_destroy(grpc_chttp2_hpack_compressor* c);
+void grpc_chttp2_hpack_compressor_set_max_table_size(
+    grpc_chttp2_hpack_compressor* c, uint32_t max_table_size);
+void grpc_chttp2_hpack_compressor_set_max_usable_size(
+    grpc_chttp2_hpack_compressor* c, uint32_t max_table_size);
+
+typedef struct {
+  uint32_t stream_id;
+  bool is_eof;
+  bool use_true_binary_metadata;
+  size_t max_frame_size;
+  grpc_transport_one_way_stats* stats;
+} grpc_encode_header_options;
+
+void grpc_chttp2_encode_header(grpc_chttp2_hpack_compressor* c,
+                               grpc_mdelem** extra_headers,
+                               size_t extra_headers_size,
+                               grpc_metadata_batch* metadata,
+                               const grpc_encode_header_options* options,
+                               grpc_slice_buffer* outbuf);
+
+#endif /* GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_HPACK_ENCODER_H */