Protocol Buffers - Google's data interchange format (grpc依赖)
https://developers.google.com/protocol-buffers/
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93 lines
2.9 KiB
93 lines
2.9 KiB
/* |
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* upb - a minimalist implementation of protocol buffers. |
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* |
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* Copyright (c) 2009-2010 Google Inc. See LICENSE for details. |
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* Author: Josh Haberman <jhaberman@gmail.com> |
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* |
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* upb_decoder implements a high performance, streaming decoder for protobuf |
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* data that works by getting its input data from a upb_bytesrc and calling |
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* into a upb_handlers. |
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*/ |
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#ifndef UPB_DECODER_H_ |
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#define UPB_DECODER_H_ |
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#include <setjmp.h> |
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#include <stdbool.h> |
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#include <stdint.h> |
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#include "upb/handlers.h" |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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/* upb_decoder *****************************************************************/ |
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struct dasm_State; |
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typedef struct _upb_decoder { |
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upb_bytesrc *bytesrc; // Source of our serialized data. |
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upb_dispatcher dispatcher; // Dispatcher to which we push parsed data. |
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upb_status *status; // Where we will store any errors that occur. |
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upb_strref strref; // For passing string data to callbacks. |
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// Offsets for the bytesrc region we currently have ref'd. |
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uint64_t refstart_ofs, refend_ofs; |
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// Current input buffer and its stream offset. |
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const char *buf, *ptr, *end; |
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uint64_t bufstart_ofs, bufend_ofs; |
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// Stream offset for the end of the top-level message, if any. |
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uint64_t end_ofs; |
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// Buf offset as of which we've delivered calbacks; needed for rollback if |
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// a callback returns UPB_BREAK. |
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const char *completed_ptr; |
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// End of the delimited region, relative to ptr, or NULL if not in this buf. |
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const char *delim_end; |
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bool top_is_packed; |
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#ifdef UPB_USE_JIT_X64 |
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// For JIT, which doesn't do bounds checks in the middle of parsing a field. |
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const char *jit_end, *effective_end; // == MIN(jit_end, submsg_end) |
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// JIT-generated machine code (else NULL). |
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char *jit_code; |
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size_t jit_size; |
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char *debug_info; |
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struct dasm_State *dynasm; |
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#endif |
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// For exiting the decoder on error. |
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sigjmp_buf exitjmp; |
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} upb_decoder; |
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// Used for frames that have no specific end offset: groups, repeated primitive |
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// fields inside groups, and the top-level message. |
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#define UPB_NONDELIMITED UINT64_MAX |
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// Initializes/uninitializes a decoder for calling into the given handlers |
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// or to write into the given msgdef, given its accessors). Takes a ref |
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// on the handlers. |
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void upb_decoder_init(upb_decoder *d, upb_handlers *h); |
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void upb_decoder_uninit(upb_decoder *d); |
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// Resets the internal state of an already-allocated decoder. This puts it in a |
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// state where it has not seen any data, and expects the next data to be from |
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// the beginning of a new protobuf. Parsers must be reset before they can be |
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// used. A decoder can be reset multiple times. |
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// |
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// Pass UINT64_MAX for end_ofs to indicate a non-delimited top-level message. |
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void upb_decoder_reset(upb_decoder *d, upb_bytesrc *src, uint64_t start_ofs, |
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uint64_t end_ofs, void *closure); |
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void upb_decoder_decode(upb_decoder *d, upb_status *status); |
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#ifdef __cplusplus |
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} /* extern "C" */ |
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#endif |
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#endif /* UPB_DECODER_H_ */
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