# updata

**Repository Path**: seek_admin/updata

## Basic Information

- **Project Name**: updata
- **Description**: 使用bsdiff实现增量更新
- **Primary Language**: Android
- **License**: Not specified
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2022-10-12
- **Last Updated**: 2022-10-12

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# updata

#### 介绍
使用bsdiff实现增量更新
https://blog.csdn.net/u011109881/article/details/118325857
下载：http://www.daemonology.net/bsdiff/
1.解压
root@ecs-83255:/android/bsdiff# tar -zxvf bsdiff-4.3.tar.gz 

2.Make

修改MakeFile
root@ecs-83255:/android/bsdiff/bsdiff-4.3# vim Makefile 


```
CFLAGS          +=      -O3 -lbz2
  
PREFIX          ?=      /usr/local
INSTALL_PROGRAM ?=      ${INSTALL} -c -s -m 555
INSTALL_MAN     ?=      ${INSTALL} -c -m 444

all:            bsdiff bspatch
bsdiff:         bsdiff.c
        cc bsdiff.c ${CFLAGS} -o bsdiff 添加这个
bspatch:        bspatch.c
        cc bspatch.c ${CFLAGS} -o bspatch 添加这个

install:
        ${INSTALL_PROGRAM} bsdiff bspatch ${PREFIX}/bin
        .ifndef WITHOUT_MAN 这里这里使用tab键
        ${INSTALL_MAN} bsdiff.1 bspatch.1 ${PREFIX}/man/man1
        .endif 这里这里使用tab键
```


3.生成差分包 bsdiff  ./bsdiff  v1.apk v2.apk v1-v2.patch
4.合成新apk bspatch ./bspatch v1.apk new.apk v1-v2.patch
5.android创建c++项目copy .c文件（bsdiff.c 用于生产差分包一般放在服务端使用，bspatch用于利用差分包合成新的apk文件）
![输入图片说明](https://foruda.gitee.com/images/1665563392544400477/4e7ea6c8_632426.png "屏幕截图")
6.bspatch依赖 bzip文件 需要下载bzip源码
![输入图片说明](https://foruda.gitee.com/images/1665563533827425637/96228fa5_632426.png "屏幕截图")
下载bzip https://www.sourceware.org/bzip2/downloads.html
![输入图片说明](https://foruda.gitee.com/images/1665563561060705176/417d08b3_632426.png "屏幕截图")
将bzip2导入cpp文件夹
![输入图片说明](https://foruda.gitee.com/images/1665563619403044590/e4739005_632426.png "屏幕截图")
cmakefile配置导入的文件
![输入图片说明](https://foruda.gitee.com/images/1665563658240881555/0f9a41e5_632426.png "屏幕截图")
修改bspatch.c 和bsdiff.c的main方法名称 并进行声明引用
![输入图片说明](https://foruda.gitee.com/images/1665563771515284062/6f98da7d_632426.png "屏幕截图")
调用的地方进行声明引用
![输入图片说明](https://foruda.gitee.com/images/1665563922461438041/b86085db_632426.png "屏幕截图")
创建native方法进行调用

```
JNIEXPORT
jint JNICALL
Java_native_BspatchUtil_00024Companion_patch(JNIEnv *env, jobject thiz, jstring path_old,
                                             jstring path_new,
                                             jstring patch) {
    const char* old_path = env->GetStringUTFChars(path_old,0);
    const char * new_path = env->GetStringUTFChars(path_new,0);
    const char * patch_path = env->GetStringUTFChars(patch,0);
    int argc = 4;//参数个数
    char *argv[argc];//参数列表
    //  ./bspatch 1.apk new.apk 1-2.patch
    argv[0] = "bspatch";
    argv[1] = const_cast<char *>(old_path);
    argv[2] = const_cast<char *>(new_path);
    argv[3] = const_cast<char *>(patch_path);
    int result = patch_main(argc,argv);
    env->ReleaseStringUTFChars(path_old, old_path);
    env->ReleaseStringUTFChars(path_new, new_path);
    env->ReleaseStringUTFChars(patch, patch_path);
    return result;//0表示成功
}
}
```

7.成果
![![输入图片说明](https://foruda.gitee.com/images/1665564279743289683/9d577d37_632426.j![输入图片说明](https://foruda.gitee.com/images/1665564302756458964/8d14400a_632426.jpeg "Screenshot_2022-10-12-16-41-36-50_7dbf4e2df42303df52cae8a2df2d3726[2].jpg")peg "Screenshot_2022-10-12-16-41-20-39_bb8ece83317b06ec453d187d61792a56[1].jpg")](https://foruda.gitee.com/images/1665564217880251553/bdf8d985_632426.jpeg "Screenshot_2022-10-12-16-40-45-24_7dbf4e2df42303df52cae8a2df2d3726[1].jpg")