yan/archived-ip2region
1
0
Fork 0
mirror of https://github.com/netfun2000/ip2region.git synced 2026-02-27 09:44:31 +08:00
Code Issues Packages Projects Releases Wiki Activity

maker constants define

Browse Source
This commit is contained in:
lion
2022-07-13 17:00:24 +08:00
parent 696d7dd647
commit 3488d10d2b
1 changed files with 55 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

55
maker/java/src/main/java/org/lionsoul/ip2region/xdb/Maker.java
View File

@@ -5,7 +5,62 @@
// @Author Lion <chenxin619315@gmail.com>
// @Date 2022/07/12
// --- Ip2Region v2.0 data structure
//
// +----------------+--------------------------+---------------+--------------+
// | header space | vector speed up index | data payload | block index |
// +----------------+--------------------------+---------------+--------------+
// | 256 bytes | 512 KiB (fixed) | dynamic size | dynamic size |
// +----------------+--------------------------+---------------+--------------+
//
// 1. padding space : for header info like block index ptr, version, release date eg ... or any other temporary needs.
// -- 2bytes: version number, different version means structure update, it fixed to 2 for now
// -- 2bytes: index algorithm code.
// -- 4bytes: generate unix timestamp (version)
// -- 4bytes: index block start ptr
// -- 4bytes: index block end ptr
//
//
// 2. data block : region or whatever data info.
// 3. segment index block : binary index block.
// 4. vector index block : fixed index info for block index search speed up.
// space structure table:
// -- 0 -> | 1rt super block | 2nd super block | 3rd super block | ... | 255th super block
// -- 1 -> | 1rt super block | 2nd super block | 3rd super block | ... | 255th super block
// -- 2 -> | 1rt super block | 2nd super block | 3rd super block | ... | 255th super block
// -- ...
// -- 255 -> | 1rt super block | 2nd super block | 3rd super block | ... | 255th super block
//
//
// super block structure:
// +-----------------------+----------------------+
// | first index block ptr | last index block ptr |
// +-----------------------+----------------------+
//
// data entry structure:
// +--------------------+-----------------------+
// | 2bytes (for desc) | dynamic length |
// +--------------------+-----------------------+
// data length whatever in bytes
//
// index entry structure
// +------------+-----------+---------------+------------+
// | 4bytes | 4bytes | 2bytes | 4 bytes |
// +------------+-----------+---------------+------------+
// start ip end ip data length data ptr
package org.lionsoul.ip2region.xdb;
public class Maker {
// constants define
public static final int VersionNo = 2;
public static final int HeaderInfoLength = 256;
public static final int VectorIndexRows = 256;
public static final int VectorIndexCols = 256;
public static final int VectorIndexSize = 8;
public static final int SegmentIndexSize = 14;
public Maker() {
}
}