header/vector/content load util funcs is ready

binding/javascript/header.js

@@ -5,8 +5,15 @@
 // xdb header class
 // @Author Lion <chenxin619315@gmail.com>
 
-const xdb_structure_20 = 2;
-const xdb_structure_30 = 3;
+const XdbStructure20 = 2;
+const XdbStructure30 = 3;
+const xdbIPv4Id = 4;
+const xdbIPv6Id = 6;
+
+const HeaderInfoLength = 256;
+const VectorIndexRows  = 256;
+const VectorIndexCols  = 256;
+const VectorIndexSize  = 8;
 
 class Header {
     constructor(buff) {
@@ -69,6 +76,7 @@ class Header {
 }
 
 module.exports = {
-    xdb_structure_20, xdb_structure_30,
+    XdbStructure20, XdbStructure30, xdbIPv4Id, xdbIPv6Id,
+    HeaderInfoLength, VectorIndexRows, VectorIndexCols, VectorIndexSize,
     Header
 }

binding/javascript/package.json

@@ -2,7 +2,6 @@
   "name": "ip2region",
   "version": "3.0.0",
   "description": "javascript (ES6) binding for ip2region with both IPv4 and IPv6 supported ",
-  "type": "module",
   "main": "index.js",
   "scripts": {
     "test": "jest"

binding/javascript/tests/util.test.js

@@ -0,0 +1,26 @@
+// Copyright 2022 The Ip2Region Authors. All rights reserved.
+// Use of this source code is governed by a Apache2.0-style
+// license that can be found in the LICENSE file.
+
+// util test script
+// @Author Lion <chenxin619315@gmail.com>
+
+const util = require('../util');
+const path = require('path');
+
+const dbPath = path.join(__dirname, '..', '..', '..', 'data', 'ip2region_v4.xdb')
+
+test('test load header', () => {
+    let header = util.loadHeaderFromFile(dbPath);
+    console.log(`dbPath: ${dbPath}, header: ${header.toString()}}`);
+});
+
+test('test load vector index', () => {
+    let vIndex = util.loadVectorIndexFromFile(dbPath);
+    console.log(`dbPath: ${dbPath}, vIndex: ${vIndex.length}}`);
+});
+
+test('test load content', () => {
+    let content = util.loadContentFromFile(dbPath);
+    console.log(`dbPath: ${dbPath}, content: ${content.length}}`);
+});

binding/javascript/tests/version.test.js

@@ -2,6 +2,9 @@
 // Use of this source code is governed by a Apache2.0-style
 // license that can be found in the LICENSE file.
 
+// version test script
+// @Author Lion <chenxin619315@gmail.com>
+
 const version = require('../version');
 
 test('const print', () => {

binding/javascript/util.js

@@ -5,6 +5,9 @@
 // util functions
 // @Author Lion <chenxin619315@gmail.com>
 
+const header = require('./header');
+const fs = require('fs');
+
 // parse the specified string ip and return its bytes
 // @param  ip string
 // @return Buffer
@@ -24,26 +27,59 @@ function ipCompare(ip1, ip2) {
 }
 
 // load header from xdb file
-function loadHeader(handle) {
-
+function loadHeader(fd) {
+    const buffer = Buffer.alloc(header.HeaderInfoLength);
+    const rBytes = fs.readSync(fd, buffer, 0, header.HeaderInfoLength, 0);
+    if (rBytes != header.HeaderInfoLength) {
+        throw new Error(`incomplete read (${rBytes} read, ${header.HeaderInfoLength} expected)`);
+    }
+    return new header.Header(buffer);
 }
 
 function loadHeaderFromFile(dbPath) {
-
+    const fd = fs.openSync(dbPath, "r");
+    const header = loadHeader(fd);
+    fs.closeSync(fd);
+    return header;
 }
 
-function loadVectorIndex(handle) {
-
+function loadVectorIndex(fd) {
+    const vBytes = header.VectorIndexCols * header.VectorIndexRows * header.VectorIndexSize;
+    const buffer = Buffer.alloc(vBytes);
+    const rBytes = fs.readSync(fd, buffer, 0, vBytes, header.HeaderInfoLength);
+    if (rBytes != vBytes) {
+        throw new Error(`incomplete read (${rBytes} read, ${vBytes} expected)`);
+    }
+    return buffer;
 }
 
 function loadVectorIndexFromFile(dbPath) {
-
+    const fd = fs.openSync(dbPath, "r");
+    const vIndex = loadVectorIndex(fd);
+    fs.closeSync(fd);
+    return vIndex;
 }
 
-function loadContent(handle) {
-
+function loadContent(fd) {
+    const stats = fs.fstatSync(fd);
+    const buffer = Buffer.alloc(stats.size);
+    const rBytes = fs.readSync(fd, buffer, 0, buffer.length, 0);
+    if (rBytes != stats.size) {
+        throw new Error(`incomplete read (${rBytes} read, ${stats.size} expected)`);
+    }
+    return buffer;
 }
 
 function loadContentFromFile(dbPath) {
-
+    const fd = fs.openSync(dbPath, "r");
+    const content = loadContent(fd);
+    fs.close(fd, function(){});
+    return content;
+}
+
+module.exports = {
+    parseIP, ipToString, ipCompare,
+    loadHeader, loadHeaderFromFile,
+    loadVectorIndex, loadVectorIndexFromFile,
+    loadContent, loadContentFromFile
 }

binding/javascript/version.js

@@ -7,9 +7,6 @@
 
 const header = require('./header');
 
-const xdb_ipv4_id = 4;
-const xdb_ipv6_id = 6;
-
 class Version {
     constructor(id, name, bytes, indexSize, ip_compare_func) {
         this.id = id;
@@ -49,11 +46,11 @@ class Version {
 }
 
 // 14 = 4 + 4 + 2 + 4
-const IPv4 = new Version(xdb_ipv4_id, "IPv4", 4, 14, function(ip1, ip2){
+const IPv4 = new Version(header.xdbIPv4Id, "IPv4", 4, 14, function(ip1, ip2){
 });
 
 // 38 = 16 + 16 + 2 + 4
-const IPv6 = new Version(xdb_ipv6_id, "IPv6", 6, 38, function(ip1, ip2){
+const IPv6 = new Version(header.xdbIPv6Id, "IPv6", 6, 38, function(ip1, ip2){
 });
 
 function versionFromName(name) {
@@ -71,19 +68,19 @@ function versionFromHeader(h) {
     let v = h.version();
 
     // old structure with ONLY IPv4 supporting
-    if (v == header.xdb_structure_20) {
+    if (v == header.XdbStructure20) {
         return IPv4;
     }
 
     // structure 3.0 with IPv6 supporting
-    if (v != header.xdb_structure_30) {
+    if (v != header.XdbStructure30) {
         return null;
     }
 
     let ipVer = h.ipVersion();
-    if (ipVer == xdb_ipv4_id) {
+    if (ipVer == header.xdbIPv4Id) {
         return IPv4;
-    } else if (ipVer == xdb_ipv6_id) {
+    } else if (ipVer == header.xdbIPv6Id) {
         return IPv6;
     } else {
         return null;
@@ -91,7 +88,6 @@ function versionFromHeader(h) {
 }
 
 module.exports = {
-    xdb_ipv4_id, xdb_ipv6_id,
     Version, IPv4, IPv6,
     versionFromName, versionFromHeader
 }