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// Protocol Buffers - Google's data interchange format
// Copyright 2023 Google LLC. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file or at
// https://developers.google.com/open-source/licenses/bsd
#ifndef UPB_MINI_TABLE_ENCODE_INTERNAL_HPP_
#define UPB_MINI_TABLE_ENCODE_INTERNAL_HPP_
#include <string>
#include "upb/base/internal/log2.h"
#include "upb/mini_descriptor/internal/encode.h"
namespace upb {
class MtDataEncoder {
public:
MtDataEncoder() : appender_(&encoder_) {}
bool StartMessage(uint64_t msg_mod) {
return appender_([this, msg_mod](char* buf) {
return upb_MtDataEncoder_StartMessage(&encoder_, buf, msg_mod);
});
}
bool PutField(upb_FieldType type, uint32_t field_num, uint64_t field_mod) {
return appender_([this, type, field_num, field_mod](char* buf) {
return upb_MtDataEncoder_PutField(&encoder_, buf, type, field_num,
field_mod);
});
}
bool StartOneof() {
return appender_([this](char* buf) {
return upb_MtDataEncoder_StartOneof(&encoder_, buf);
});
}
bool PutOneofField(uint32_t field_num) {
return appender_([this, field_num](char* buf) {
return upb_MtDataEncoder_PutOneofField(&encoder_, buf, field_num);
});
}
bool StartEnum() {
return appender_([this](char* buf) {
return upb_MtDataEncoder_StartEnum(&encoder_, buf);
});
}
bool PutEnumValue(uint32_t enum_value) {
return appender_([this, enum_value](char* buf) {
return upb_MtDataEncoder_PutEnumValue(&encoder_, buf, enum_value);
});
}
bool EndEnum() {
return appender_([this](char* buf) {
return upb_MtDataEncoder_EndEnum(&encoder_, buf);
});
}
bool EncodeExtension(upb_FieldType type, uint32_t field_num,
uint64_t field_mod) {
return appender_([this, type, field_num, field_mod](char* buf) {
return upb_MtDataEncoder_EncodeExtension(&encoder_, buf, type, field_num,
field_mod);
});
}
bool EncodeMap(upb_FieldType key_type, upb_FieldType val_type,
uint64_t key_mod, uint64_t val_mod) {
return appender_([this, key_type, val_type, key_mod, val_mod](char* buf) {
return upb_MtDataEncoder_EncodeMap(&encoder_, buf, key_type, val_type,
key_mod, val_mod);
});
}
bool EncodeMessageSet() {
return appender_([this](char* buf) {
return upb_MtDataEncoder_EncodeMessageSet(&encoder_, buf);
});
}
const std::string& data() const { return appender_.data(); }
private:
class StringAppender {
public:
StringAppender(upb_MtDataEncoder* e) { e->end = buf_ + sizeof(buf_); }
template <class T>
bool operator()(T&& func) {
char* end = func(buf_);
if (!end) return false;
// C++ does not guarantee that string has doubling growth behavior, but
// we need it to avoid O(n^2).
str_.reserve(upb_Log2CeilingSize(str_.size() + (end - buf_)));
str_.append(buf_, end - buf_);
return true;
}
const std::string& data() const { return str_; }
private:
char buf_[kUpb_MtDataEncoder_MinSize];
std::string str_;
};
upb_MtDataEncoder encoder_;
StringAppender appender_;
};
} // namespace upb
#endif /* UPB_MINI_TABLE_ENCODE_INTERNAL_HPP_ */
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