THUAI6/CAPI/cpp/grpc/include/upb/decode.h

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 * Copyright (c) 2009-2021, Google LLC
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 *
 * Redistribution and use in source and binary forms, with or without
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 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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/*
 * upb_decode: parsing into a upb_Message using a upb_MiniTable.
 */

#ifndef UPB_DECODE_H_
#define UPB_DECODE_H_

#include "upb/extension_registry.h"
#include "upb/msg.h"

/* Must be last. */
#include "upb/port_def.inc"

#ifdef __cplusplus
extern "C"
{
#endif

    enum
    {
        /* If set, strings will alias the input buffer instead of copying into the
         * arena. */
        kUpb_DecodeOption_AliasString = 1,

        /* If set, the parse will return failure if any message is missing any
         * required fields when the message data ends.  The parse will still continue,
         * and the failure will only be reported at the end.
         *
         * IMPORTANT CAVEATS:
         *
         * 1. This can throw a false positive failure if an incomplete message is seen
         *    on the wire but is later completed when the sub-message occurs again.
         *    For this reason, a second pass is required to verify a failure, to be
         *    truly robust.
         *
         * 2. This can return a false success if you are decoding into a message that
         *    already has some sub-message fields present.  If the sub-message does
         *    not occur in the binary payload, we will never visit it and discover the
         *    incomplete sub-message.  For this reason, this check is only useful for
         *    implemting ParseFromString() semantics.  For MergeFromString(), a
         *    post-parse validation step will always be necessary. */
        kUpb_DecodeOption_CheckRequired = 2,
    };

#define UPB_DECODE_MAXDEPTH(depth) ((depth) << 16)

    typedef enum
    {
        kUpb_DecodeStatus_Ok = 0,
        kUpb_DecodeStatus_Malformed = 1,         // Wire format was corrupt
        kUpb_DecodeStatus_OutOfMemory = 2,       // Arena alloc failed
        kUpb_DecodeStatus_BadUtf8 = 3,           // String field had bad UTF-8
        kUpb_DecodeStatus_MaxDepthExceeded = 4,  // Exceeded UPB_DECODE_MAXDEPTH

        // kUpb_DecodeOption_CheckRequired failed (see above), but the parse otherwise
        // succeeded.
        kUpb_DecodeStatus_MissingRequired = 5,
    } upb_DecodeStatus;

    upb_DecodeStatus upb_Decode(const char* buf, size_t size, upb_Message* msg, const upb_MiniTable* l, const upb_ExtensionRegistry* extreg, int options, upb_Arena* arena);

#ifdef __cplusplus
} /* extern "C" */
#endif

#include "upb/port_undef.inc"

#endif /* UPB_DECODE_H_ */