Built motion from commit 6a09e18b.|2.6.11

[motion2.git] / legacy-libs / grpc / deps / grpc / include / grpc / impl / codegen / slice.h

diff --git a/legacy-libs/grpc/deps/grpc/include/grpc/impl/codegen/slice.h b/legacy-libs/grpc/deps/grpc/include/grpc/impl/codegen/slice.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_IMPL_CODEGEN_SLICE_H
+#define GRPC_IMPL_CODEGEN_SLICE_H
+
+#include <grpc/impl/codegen/port_platform.h>
+
+#include <stddef.h>
+
+#include <grpc/impl/codegen/gpr_slice.h>
+
+typedef struct grpc_slice grpc_slice;
+
+/** Slice API
+
+   A slice represents a contiguous reference counted array of bytes.
+   It is cheap to take references to a slice, and it is cheap to create a
+   slice pointing to a subset of another slice.
+
+   The data-structure for slices is exposed here to allow non-gpr code to
+   build slices from whatever data they have available.
+
+   When defining interfaces that handle slices, care should be taken to define
+   reference ownership semantics (who should call unref?) and mutability
+   constraints (is the callee allowed to modify the slice?) */
+
+/* Inlined half of grpc_slice is allowed to expand the size of the overall type
+   by this many bytes */
+#define GRPC_SLICE_INLINE_EXTRA_SIZE sizeof(void*)
+
+#define GRPC_SLICE_INLINED_SIZE \
+  (sizeof(size_t) + sizeof(uint8_t*) - 1 + GRPC_SLICE_INLINE_EXTRA_SIZE)
+
+struct grpc_slice_refcount;
+/** A grpc_slice s, if initialized, represents the byte range
+   s.bytes[0..s.length-1].
+
+   It can have an associated ref count which has a destruction routine to be run
+   when the ref count reaches zero (see grpc_slice_new() and grp_slice_unref()).
+   Multiple grpc_slice values may share a ref count.
+
+   If the slice does not have a refcount, it represents an inlined small piece
+   of data that is copied by value. */
+struct grpc_slice {
+  struct grpc_slice_refcount* refcount;
+  union grpc_slice_data {
+    struct grpc_slice_refcounted {
+      size_t length;
+      uint8_t* bytes;
+    } refcounted;
+    struct grpc_slice_inlined {
+      uint8_t length;
+      uint8_t bytes[GRPC_SLICE_INLINED_SIZE];
+    } inlined;
+  } data;
+};
+
+#define GRPC_SLICE_BUFFER_INLINE_ELEMENTS 8
+
+/** Represents an expandable array of slices, to be interpreted as a
+   single item. */
+typedef struct grpc_slice_buffer {
+  /** This is for internal use only. External users (i.e any code outside grpc
+   * core) MUST NOT use this field */
+  grpc_slice* base_slices;
+
+  /** slices in the array (Points to the first valid grpc_slice in the array) */
+  grpc_slice* slices;
+  /** the number of slices in the array */
+  size_t count;
+  /** the number of slices allocated in the array. External users (i.e any code
+   * outside grpc core) MUST NOT use this field */
+  size_t capacity;
+  /** the combined length of all slices in the array */
+  size_t length;
+  /** inlined elements to avoid allocations */
+  grpc_slice inlined[GRPC_SLICE_BUFFER_INLINE_ELEMENTS];
+} grpc_slice_buffer;
+
+#define GRPC_SLICE_START_PTR(slice)                 \
+  ((slice).refcount ? (slice).data.refcounted.bytes \
+                    : (slice).data.inlined.bytes)
+#define GRPC_SLICE_LENGTH(slice)                     \
+  ((slice).refcount ? (slice).data.refcounted.length \
+                    : (slice).data.inlined.length)
+#define GRPC_SLICE_SET_LENGTH(slice, newlen)                              \
+  ((slice).refcount ? ((slice).data.refcounted.length = (size_t)(newlen)) \
+                    : ((slice).data.inlined.length = (uint8_t)(newlen)))
+#define GRPC_SLICE_END_PTR(slice) \
+  GRPC_SLICE_START_PTR(slice) + GRPC_SLICE_LENGTH(slice)
+#define GRPC_SLICE_IS_EMPTY(slice) (GRPC_SLICE_LENGTH(slice) == 0)
+
+#ifdef GRPC_ALLOW_GPR_SLICE_FUNCTIONS
+
+/* Duplicate GPR_* definitions */
+#define GPR_SLICE_START_PTR(slice)                  \
+  ((slice).refcount ? (slice).data.refcounted.bytes \
+                    : (slice).data.inlined.bytes)
+#define GPR_SLICE_LENGTH(slice)                      \
+  ((slice).refcount ? (slice).data.refcounted.length \
+                    : (slice).data.inlined.length)
+#define GPR_SLICE_SET_LENGTH(slice, newlen)                               \
+  ((slice).refcount ? ((slice).data.refcounted.length = (size_t)(newlen)) \
+                    : ((slice).data.inlined.length = (uint8_t)(newlen)))
+#define GPR_SLICE_END_PTR(slice) \
+  GRPC_SLICE_START_PTR(slice) + GRPC_SLICE_LENGTH(slice)
+#define GPR_SLICE_IS_EMPTY(slice) (GRPC_SLICE_LENGTH(slice) == 0)
+
+#endif /* GRPC_ALLOW_GPR_SLICE_FUNCTIONS */
+
+#endif /* GRPC_IMPL_CODEGEN_SLICE_H */