value_log.h

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/*
 * Copyright 2022 Adam Bishop Comer
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
#ifndef WISCKEY_VALUE_LOG_H
#define WISCKEY_VALUE_LOG_H
 
#include <stdio.h>


struct ValueLog
{
  FILE* file;  
  size_t head; 
  size_t tail; 
};

struct ValueLog*
ValueLog_new(const char* path, size_t head, size_t tail);

int
ValueLog_append(struct ValueLog* log,
                size_t* pos,
                const char* key,
                size_t key_len,
                const char* value,
                size_t value_len);

int
ValueLog_get(const struct ValueLog* log,
             char** value,
             size_t* value_len,
             size_t value_loc);

int
ValueLog_sync(const struct ValueLog* log);

void
ValueLog_free(struct ValueLog* log);
 
#endif /* WISCKEY_VALUE_LOG_H */