Protocol Buffers - Google's data interchange format (grpc依赖)
https://developers.google.com/protocol-buffers/
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84 lines
3.4 KiB
84 lines
3.4 KiB
2 years ago
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/*
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* Copyright (c) 2009-2021, Google LLC
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Google LLC nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL Google LLC BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef UPB_MESSAGE_EXTENSION_INTERNAL_H_
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#define UPB_MESSAGE_EXTENSION_INTERNAL_H_
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#include "upb/base/descriptor_constants.h"
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#include "upb/base/string_view.h"
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#include "upb/mem/arena.h"
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#include "upb/message/message.h"
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#include "upb/mini_table/extension_internal.h"
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// Must be last.
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#include "upb/port/def.inc"
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// The internal representation of an extension is self-describing: it contains
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// enough information that we can serialize it to binary format without needing
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// to look it up in a upb_ExtensionRegistry.
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//
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// This representation allocates 16 bytes to data on 64-bit platforms.
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// This is rather wasteful for scalars (in the extreme case of bool,
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// it wastes 15 bytes). We accept this because we expect messages to be
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// the most common extension type.
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typedef struct {
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const upb_MiniTableExtension* ext;
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union {
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upb_StringView str;
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void* ptr;
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char scalar_data[8];
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} data;
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} upb_Message_Extension;
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#ifdef __cplusplus
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extern "C" {
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#endif
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// Adds the given extension data to the given message.
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// |ext| is copied into the message instance.
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// This logically replaces any previously-added extension with this number.
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upb_Message_Extension* _upb_Message_GetOrCreateExtension(
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upb_Message* msg, const upb_MiniTableExtension* ext, upb_Arena* arena);
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// Returns an array of extensions for this message.
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// Note: the array is ordered in reverse relative to the order of creation.
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const upb_Message_Extension* _upb_Message_Getexts(const upb_Message* msg,
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size_t* count);
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// Returns an extension for the given field number, or NULL if no extension
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// exists for this field number.
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const upb_Message_Extension* _upb_Message_Getext(
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const upb_Message* msg, const upb_MiniTableExtension* ext);
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#include "upb/port/undef.inc"
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#endif /* UPB_MESSAGE_EXTENSION_INTERNAL_H_ */
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