69 lines
2.0 KiB
C
69 lines
2.0 KiB
C
/*
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* Copyright (c) 2012-2013 Spotify AB
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not
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* use this file except in compliance with the License. You may obtain a copy of
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* the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations under
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* the License.
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*/
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#ifndef SPARKEY_LOGHEADER_H_INCLUDED
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#define SPARKEY_LOGHEADER_H_INCLUDED
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#include <stdint.h>
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#include "sparkey.h"
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#define LOG_MAGIC_NUMBER (0x49b39c95)
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#define LOG_MAJOR_VERSION (1)
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#define LOG_MINOR_VERSION (0)
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#define LOG_HEADER_SIZE (84)
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typedef struct {
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uint32_t major_version;
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uint32_t minor_version;
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uint32_t file_identifier;
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uint64_t num_puts;
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uint64_t num_deletes;
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uint64_t data_end;
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uint64_t max_key_len;
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uint64_t max_value_len;
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uint64_t delete_size;
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sparkey_compression_type compression_type;
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uint32_t compression_block_size;
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uint64_t put_size;
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uint32_t header_size;
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uint32_t max_entries_per_block;
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} sparkey_logheader;
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/**
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* fills up a logheader struct based on the contents at the beginning of the file.
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* @param header header struct to fill
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* @param filename a log file
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* @returns an error code if it could not load the file.
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*/
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sparkey_returncode sparkey_load_logheader(sparkey_logheader *header, const char *filename);
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/**
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* Dumps a human readable representation of the header to stdout
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* @param header an initialized header struct
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*/
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void print_logheader(sparkey_logheader *header);
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/**
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* Writes a header to the current position in the file
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* @param fd a file descripter pointing to a file open for writing
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* @param header the header to write
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* @returns an error code if it could not write to file.
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*/
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sparkey_returncode write_logheader(int fd, sparkey_logheader *header);
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#endif
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