Protocol Buffers - Google's data interchange format (grpc依赖)
https://developers.google.com/protocol-buffers/
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83 lines
2.3 KiB
83 lines
2.3 KiB
/* |
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** upb::pb::Encoder (upb_pb_encoder) |
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** |
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** Implements a set of upb_handlers that write protobuf data to the binary wire |
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** format. |
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** |
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** This encoder implementation does not have any access to any out-of-band or |
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** precomputed lengths for submessages, so it must buffer submessages internally |
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** before it can emit the first byte. |
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*/ |
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#ifndef UPB_ENCODER_H_ |
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#define UPB_ENCODER_H_ |
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#include "upb/sink.h" |
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#ifdef __cplusplus |
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namespace upb { |
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namespace pb { |
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class EncoderPtr; |
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} /* namespace pb */ |
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} /* namespace upb */ |
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#endif |
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#define UPB_PBENCODER_MAX_NESTING 100 |
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/* upb_pb_encoder *************************************************************/ |
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/* Preallocation hint: decoder won't allocate more bytes than this when first |
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* constructed. This hint may be an overestimate for some build configurations. |
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* But if the decoder library is upgraded without recompiling the application, |
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* it may be an underestimate. */ |
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#define UPB_PB_ENCODER_SIZE 784 |
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struct upb_pb_encoder; |
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typedef struct upb_pb_encoder upb_pb_encoder; |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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upb_sink upb_pb_encoder_input(upb_pb_encoder *p); |
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upb_pb_encoder* upb_pb_encoder_create(upb_arena* a, const upb_handlers* h, |
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upb_bytessink output); |
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/* Lazily builds and caches handlers that will push encoded data to a bytessink. |
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* Any msgdef objects used with this object must outlive it. */ |
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upb_handlercache *upb_pb_encoder_newcache(void); |
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#ifdef __cplusplus |
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} /* extern "C" { */ |
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class upb::pb::EncoderPtr { |
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public: |
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EncoderPtr(upb_pb_encoder* ptr) : ptr_(ptr) {} |
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upb_pb_encoder* ptr() { return ptr_; } |
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/* Creates a new encoder in the given environment. The Handlers must have |
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* come from NewHandlers() below. */ |
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static EncoderPtr Create(Arena* arena, const Handlers* handlers, |
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BytesSink output) { |
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return EncoderPtr( |
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upb_pb_encoder_create(arena->ptr(), handlers, output.sink())); |
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} |
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/* The input to the encoder. */ |
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upb::Sink input() { return upb_pb_encoder_input(ptr()); } |
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/* Creates a new set of handlers for this MessageDef. */ |
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static HandlerCache NewCache() { |
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return HandlerCache(upb_pb_encoder_newcache()); |
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} |
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static const size_t kSize = UPB_PB_ENCODER_SIZE; |
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private: |
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upb_pb_encoder* ptr_; |
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}; |
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#endif /* __cplusplus */ |
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#endif /* UPB_ENCODER_H_ */
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