Built motion from commit 6a09e18b.|2.6.11

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

diff --git a/legacy-libs/grpc/deps/grpc/src/core/ext/transport/chttp2/transport/varint.h b/legacy-libs/grpc/deps/grpc/src/core/ext/transport/chttp2/transport/varint.h
new file mode 100644 (file)
index 0000000..5a2b670
--- /dev/null
+++ b/legacy-libs/grpc/deps/grpc/src/core/ext/transport/chttp2/transport/varint.h
@@ -0,0 +1,60 @@
+/*
+ *
+ * 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_VARINT_H
+#define GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_VARINT_H
+
+#include <grpc/support/port_platform.h>
+
+/* Helpers for hpack varint encoding */
+
+/* length of a value that needs varint tail encoding (it's bigger than can be
+   bitpacked into the opcode byte) - returned value includes the length of the
+   opcode byte */
+uint32_t grpc_chttp2_hpack_varint_length(uint32_t tail_value);
+
+void grpc_chttp2_hpack_write_varint_tail(uint32_t tail_value, uint8_t* target,
+                                         uint32_t tail_length);
+
+/* maximum value that can be bitpacked with the opcode if the opcode has a
+   prefix
+   of length prefix_bits */
+#define GRPC_CHTTP2_MAX_IN_PREFIX(prefix_bits) \
+  ((uint32_t)((1 << (8 - (prefix_bits))) - 1))
+
+/* length required to bitpack a value */
+#define GRPC_CHTTP2_VARINT_LENGTH(n, prefix_bits) \
+  ((n) < GRPC_CHTTP2_MAX_IN_PREFIX(prefix_bits)   \
+       ? 1u                                       \
+       : grpc_chttp2_hpack_varint_length(         \
+             (n)-GRPC_CHTTP2_MAX_IN_PREFIX(prefix_bits)))
+
+#define GRPC_CHTTP2_WRITE_VARINT(n, prefix_bits, prefix_or, target, length)   \
+  do {                                                                        \
+    uint8_t* tgt = target;                                                    \
+    if ((length) == 1u) {                                                     \
+      (tgt)[0] = (uint8_t)((prefix_or) | (n));                                \
+    } else {                                                                  \
+      (tgt)[0] =                                                              \
+          (prefix_or) | (uint8_t)GRPC_CHTTP2_MAX_IN_PREFIX(prefix_bits);      \
+      grpc_chttp2_hpack_write_varint_tail(                                    \
+          (n)-GRPC_CHTTP2_MAX_IN_PREFIX(prefix_bits), (tgt) + 1, (length)-1); \
+    }                                                                         \
+  } while (0)
+
+#endif /* GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_VARINT_H */