add readme & npm codes

.gitignore

@@ -36,6 +36,7 @@ bower_components
 
 # Compiled binary addons (https://nodejs.org/api/addons.html)
 build/Release
+build/Debug
 
 # Dependency directories
 node_modules/
@@ -102,3 +103,4 @@ dist
 
 # TernJS port file
 .tern-port
+.idea

.npmignore

@@ -0,0 +1,2 @@
+.idea
+build

README.md

@@ -1 +1,17 @@
-# node-hdiffpatch
+# node-hdiffpatch
+
+Create patch buffer with origin buffer with [HDiffPatch](https://github.com/sisong/HDiffPatch)
+
+Patch compatible with HDiffPatch -SD
+
+## Installation
+
+```bash
+npm install --save node-hdiffpatch
+```
+
+## Usage
+
+### diff(originBuf, newBuf)
+
+Compare two buffers and return a new hdiffpatch patch as return value.

binding.gyp

@@ -0,0 +1,35 @@
+{
+  "targets": [
+    {
+      "target_name": "hdiffpatch",
+      "sources": [
+        "src/main.cc",
+        "src/hdiff.cpp",
+        "HDiffPatch/libHDiffPatch/HPatch/patch.c",
+        "HDiffPatch/file_for_patch.c",
+        "HDiffPatch/libHDiffPatch/HDiff/diff.cpp",
+        "HDiffPatch/libHDiffPatch/HDiff/private_diff/bytes_rle.cpp",
+        "HDiffPatch/libHDiffPatch/HDiff/private_diff/suffix_string.cpp",
+        "HDiffPatch/libHDiffPatch/HDiff/private_diff/compress_detect.cpp",
+        "HDiffPatch/libHDiffPatch/HDiff/private_diff/limit_mem_diff/digest_matcher.cpp",
+        "HDiffPatch/libHDiffPatch/HDiff/private_diff/limit_mem_diff/stream_serialize.cpp",
+        "HDiffPatch/libHDiffPatch/HDiff/private_diff/libdivsufsort/divsufsort64.cpp",
+        "HDiffPatch/libHDiffPatch/HDiff/private_diff/libdivsufsort/divsufsort.cpp",
+        "HDiffPatch/libHDiffPatch/HDiff/private_diff/limit_mem_diff/adler_roll.cpp",
+        "lzma/C/LzFind.c",
+        "lzma/C/LzmaDec.c",
+        "lzma/C/LzmaEnc.c",
+        "lzma/C/Lzma2Dec.c",
+        "lzma/C/Lzma2Enc.c"
+      ],
+      "defines": [
+        "_IS_NEED_DIR_DIFF_PATCH=0",
+        "_7ZIP_ST",
+        "_IS_USED_MULTITHREAD=0"
+      ],
+      "include_dirs" : [
+        "<!(node -e \"require('nan')\")"
+      ]
+    }
+  ]
+}

index.js

@@ -0,0 +1,21 @@
+/**
+ * Created by housisong on 2021.04.06.
+ */
+
+var native;
+try {
+  native = require('./build/Release/hdiffpatch');
+} catch(e) {
+  console.error(e);
+  native = require('./build/Debug/hdiffpatch');
+}
+exports.native = native;
+
+exports.diff = function(oldBuf, newBuf) {
+  var buffers = [];
+  native.diff(oldBuf, newBuf, function(output){
+    buffers.push(output);
+  });
+
+  return Buffer.concat(buffers);
+}

index_test.js

@@ -0,0 +1,21 @@
+/**
+ * Created by housisong on 2021.04.06.
+ */
+
+var native;
+try {
+  native = require('./build/Release/hdiffpatch');
+} catch(e) {
+  console.error(e);
+  native = require('./build/Debug/hdiffpatch');
+}
+exports.native = native;
+
+exports.diff = function(oldBuf, newBuf) {
+  var buffers = [];
+  native.diff(oldBuf, newBuf, function(output){
+    buffers.push(output);
+  });
+
+  return Buffer.concat(buffers);
+}

package.json

@@ -0,0 +1,29 @@
+{
+  "name": "node-hdiffpatch",
+  "version": "0.1.5",
+  "description": "hdiffpatch port to node.js",
+  "main": "index.js",
+  "scripts": {
+    "test": "node test/test.js"
+  },
+  "gypfile": true,
+  "author": "housisong",
+  "license": "MIT",
+  "dependencies": {
+    "nan": "^2.14.0"
+  },
+  "devDependencies": {
+    "md5": "^2.2.1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/reactnativecn/node-hdiffpatch"
+  },
+  "keywords": [
+    "hdiffpatch"
+  ],
+  "bugs": {
+    "url": "https://github.com/reactnativecn/node-hdiffpatch/issues"
+  },
+  "homepage": "https://github.com/reactnativecn/node-hdiffpatch#readme"
+}

test/test.js

@@ -0,0 +1,21 @@
+var hdiffpatch = require("../index");
+var test_hdiffpatch = require("../index_test");
+var crypto = require("crypto");
+var md5 = require("md5");
+var assert = require("assert").strict;
+
+var cur = crypto.randomBytes(40960);
+
+var ref = Buffer.concat([
+  Buffer.from("fdsa"),
+  cur.slice(0, 4096),
+  Buffer.from("asdf"),
+  cur.slice(4096),
+  Buffer.from("asdf")
+]);
+
+assert.deepStrictEqual(
+  md5(hdiffpatch.diff(cur, ref)),
+  md5(test_hdiffpatch.diff(cur, ref))
+);
+console.log("pass");

yarn.lock

@@ -0,0 +1,49 @@
+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+
+amdefine@~1.0.0:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/amdefine/-/amdefine-1.0.1.tgz#4a5282ac164729e93619bcfd3ad151f817ce91f5"
+  integrity sha1-SlKCrBZHKek2Gbz9OtFR+BfOkfU=
+
+charenc@~0.0.1:
+  version "0.0.2"
+  resolved "https://registry.yarnpkg.com/charenc/-/charenc-0.0.2.tgz#c0a1d2f3a7092e03774bfa83f14c0fc5790a8667"
+  integrity sha1-wKHS86cJLgN3S/qD8UwPxXkKhmc=
+
+commander@~2.8.1:
+  version "2.8.1"
+  resolved "https://registry.yarnpkg.com/commander/-/commander-2.8.1.tgz#06be367febfda0c330aa1e2a072d3dc9762425d4"
+  integrity sha1-Br42f+v9oMMwqh4qBy09yXYkJdQ=
+  dependencies:
+    graceful-readlink ">= 1.0.0"
+
+crypt@~0.0.1:
+  version "0.0.2"
+  resolved "https://registry.yarnpkg.com/crypt/-/crypt-0.0.2.tgz#88d7ff7ec0dfb86f713dc87bbb42d044d3e6c41b"
+  integrity sha1-iNf/fsDfuG9xPch7u0LQRNPmxBs=
+
+"graceful-readlink@>= 1.0.0":
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/graceful-readlink/-/graceful-readlink-1.0.1.tgz#4cafad76bc62f02fa039b2f94e9a3dd3a391a725"
+  integrity sha1-TK+tdrxi8C+gObL5Tpo906ORpyU=
+
+is-buffer@~1.1.1:
+  version "1.1.6"
+  resolved "https://registry.yarnpkg.com/is-buffer/-/is-buffer-1.1.6.tgz#efaa2ea9daa0d7ab2ea13a97b2b8ad51fefbe8be"
+  integrity sha512-NcdALwpXkTm5Zvvbk7owOUSvVvBKDgKP5/ewfXEznmQFfs4ZRmanOeKBTjRVjka3QFoN6XJ+9F3USqfHqTaU5w==
+
+md5@^2.2.1:
+  version "2.2.1"
+  resolved "https://registry.yarnpkg.com/md5/-/md5-2.2.1.tgz#53ab38d5fe3c8891ba465329ea23fac0540126f9"
+  integrity sha1-U6s41f48iJG6RlMp6iP6wFQBJvk=
+  dependencies:
+    charenc "~0.0.1"
+    crypt "~0.0.1"
+    is-buffer "~1.1.1"
+
+nan@^2.14.0:
+  version "2.14.0"
+  resolved "https://registry.yarnpkg.com/nan/-/nan-2.14.0.tgz#7818f722027b2459a86f0295d434d1fc2336c52c"
+  integrity sha512-INOFj37C7k3AfaNTtX8RhsTw7qRy7eLET14cROi9+5HAVbbHuIWUHEauBv5qT4Av2tWasiTY1Jw6puUNqRJXQg==