mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-15 20:24:07 +00:00
48 lines
1.1 KiB
C++
48 lines
1.1 KiB
C++
#pragma once
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
|
|
/*
|
|
Overview of compression:
|
|
______________________
|
|
| Decompressor |
|
|
|----------------------|
|
|
| Compressed file 1 |
|
|
| Compressed file 2 |
|
|
| ... |
|
|
|----------------------|
|
|
| Info about 1 file |
|
|
| Info about 2 file |
|
|
| ... |
|
|
|----------------------|
|
|
| Metadata |
|
|
|______________________|
|
|
*/
|
|
|
|
/*
|
|
Metadata contains:
|
|
1) number of files to support multiple file compression
|
|
2) start_of_files_data to know start of files metadata
|
|
3) end of binary to know start of compressed data
|
|
4) uncompressed data size
|
|
*/
|
|
struct MetaData
|
|
{
|
|
uint64_t number_of_files = 0;
|
|
uint64_t start_of_files_data = 0;
|
|
};
|
|
|
|
/// Information about each file for correct extraction.
|
|
/// Each file data is followed by name of file
|
|
/// with length equals to name_length.
|
|
struct FileData
|
|
{
|
|
uint64_t start = 0;
|
|
uint64_t end = 0;
|
|
uint64_t name_length = 0;
|
|
uint64_t uncompressed_size = 0;
|
|
uint64_t umask = 0;
|
|
};
|
|
|