Built motion from commit 6a09e18b.|2.6.11

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

diff --git a/legacy-libs/grpc/deps/grpc/src/core/ext/transport/chttp2/transport/hpack_parser.h b/legacy-libs/grpc/deps/grpc/src/core/ext/transport/chttp2/transport/hpack_parser.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_PARSER_H
+#define GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_HPACK_PARSER_H
+
+#include <grpc/support/port_platform.h>
+
+#include <stddef.h>
+
+#include "src/core/ext/transport/chttp2/transport/frame.h"
+#include "src/core/ext/transport/chttp2/transport/hpack_table.h"
+#include "src/core/lib/transport/metadata.h"
+
+typedef struct grpc_chttp2_hpack_parser grpc_chttp2_hpack_parser;
+
+typedef grpc_error* (*grpc_chttp2_hpack_parser_state)(
+    grpc_chttp2_hpack_parser* p, const uint8_t* beg, const uint8_t* end);
+
+typedef struct {
+  bool copied;
+  struct {
+    grpc_slice referenced;
+    struct {
+      char* str;
+      uint32_t length;
+      uint32_t capacity;
+    } copied;
+  } data;
+} grpc_chttp2_hpack_parser_string;
+
+struct grpc_chttp2_hpack_parser {
+  /* user specified callback for each header output */
+  grpc_error* (*on_header)(void* user_data, grpc_mdelem md);
+  void* on_header_user_data;
+
+  grpc_error* last_error;
+
+  /* current parse state - or a function that implements it */
+  grpc_chttp2_hpack_parser_state state;
+  /* future states dependent on the opening op code */
+  const grpc_chttp2_hpack_parser_state* next_state;
+  /* what to do after skipping prioritization data */
+  grpc_chttp2_hpack_parser_state after_prioritization;
+  /* the refcount of the slice that we're currently parsing */
+  grpc_slice_refcount* current_slice_refcount;
+  /* the value we're currently parsing */
+  union {
+    uint32_t* value;
+    grpc_chttp2_hpack_parser_string* str;
+  } parsing;
+  /* string parameters for each chunk */
+  grpc_chttp2_hpack_parser_string key;
+  grpc_chttp2_hpack_parser_string value;
+  /* parsed index */
+  uint32_t index;
+  /* When we parse a value string, we determine the metadata element for a
+     specific index, which we need again when we're finishing up with that
+     header. To avoid calculating the metadata element for that index a second
+     time at that stage, we cache (and invalidate) the element here. */
+  grpc_mdelem md_for_index;
+#ifndef NDEBUG
+  int64_t precomputed_md_index;
+#endif
+  /* length of source bytes for the currently parsing string */
+  uint32_t strlen;
+  /* number of source bytes read for the currently parsing string */
+  uint32_t strgot;
+  /* huffman decoding state */
+  int16_t huff_state;
+  /* is the string being decoded binary? */
+  uint8_t binary;
+  /* is the current string huffman encoded? */
+  uint8_t huff;
+  /* is a dynamic table update allowed? */
+  uint8_t dynamic_table_update_allowed;
+  /* set by higher layers, used by grpc_chttp2_header_parser_parse to signal
+     it should append a metadata boundary at the end of frame */
+  uint8_t is_boundary;
+  uint8_t is_eof;
+  uint32_t base64_buffer;
+
+  /* hpack table */
+  grpc_chttp2_hptbl table;
+};
+
+void grpc_chttp2_hpack_parser_init(grpc_chttp2_hpack_parser* p);
+void grpc_chttp2_hpack_parser_destroy(grpc_chttp2_hpack_parser* p);
+
+void grpc_chttp2_hpack_parser_set_has_priority(grpc_chttp2_hpack_parser* p);
+
+grpc_error* grpc_chttp2_hpack_parser_parse(grpc_chttp2_hpack_parser* p,
+                                           const grpc_slice& slice);
+
+/* wraps grpc_chttp2_hpack_parser_parse to provide a frame level parser for
+   the transport */
+grpc_error* grpc_chttp2_header_parser_parse(void* hpack_parser,
+                                            grpc_chttp2_transport* t,
+                                            grpc_chttp2_stream* s,
+                                            const grpc_slice& slice,
+                                            int is_last);
+
+#endif /* GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_HPACK_PARSER_H */