Protocol Buffers - Google's data interchange format (grpc依赖)
https://developers.google.com/protocol-buffers/
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63 lines
2.1 KiB
63 lines
2.1 KiB
// Protocol Buffers - Google's data interchange format |
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// Copyright 2023 Google LLC. All rights reserved. |
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// |
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// Use of this source code is governed by a BSD-style |
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// license that can be found in the LICENSE file or at |
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// https://developers.google.com/open-source/licenses/bsd |
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#ifndef UPB_MESSAGE_INTERNAL_EXTENSION_H_ |
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#define UPB_MESSAGE_INTERNAL_EXTENSION_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/internal/message.h" |
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#include "upb/mini_table/extension.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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struct upb_Extension { |
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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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}; |
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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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struct upb_Extension* _upb_Message_GetOrCreateExtension( |
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struct upb_Message* msg, const upb_MiniTableExtension* ext, |
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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 struct upb_Extension* UPB_PRIVATE(_upb_Message_Getexts)( |
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const struct upb_Message* msg, size_t* count); |
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// Returns an extension for a message with a given mini table, |
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// or NULL if no extension exists with this mini table. |
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const struct upb_Extension* _upb_Message_Getext( |
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const struct 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_INTERNAL_EXTENSION_H_ */
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