环境：

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centos  android9 idea

 

步骤：

1.下载bsdiff

 

2.centos 安装

 

gcc 

 

make

 

bzip2 

 

bzip2-devel

 

命令

 

yum -y install gcc autoconf automake libtool make

 

yum -y install bzip2

 

yum -y install bzip2-devel

 

3.修改解压后bsdiff中Makefile文件     .ifndef WITHOUT_MAN 和   endif缩进

 

4.在bsdiff中执行make命令生成bsdiff和bspatch 文件

 

5.生成合并差异包

 

生成   bsdiff   oldapk_path.apk  newapk_path.apk  patchName.patch

 

合并   bspatch oldapk_path.apk  newName_path.apk  patch_path.patch

 

以上为服务端

 

Android端

1.ndk新建个PatchUtil.java用与调用native方法

public class PatchUtils {

 

    private static PatchUtils instance;

 

    static {

        System.loadLibrary("update");

    }

 

    public static PatchUtils getInstance(){

        if(instance==null){

            instance = new PatchUtils();

        }

        return instance;

    }

 

    /**

     * native方法 使用路径为oldApkPath的Apk与路径为patchPath的补丁包合成一个新的apk存储与newApkPath

     * 返回0成功

     * @param oldApkPath   示例：/usr/old/old.apk

     * @param newApkPath   示例：/usr/new/new.apk

     * @param patchPath    示例：/usr/patch/patch_1.patch

     * @return

     */

    public static native int bspatch(String oldApkPath, String newApkPath, String patchPath);

 

 

}

配置java.h 和buildOS

3.使用javah命令生成头文件,会在jni文件夹下生成com_xxx_xxx_xxx.PatchUtils.h,

4.将bsdiff文件夹下载bspatch.c导入jni文件夹

 

5.下载bzip2导入jni文件夹，删除除了.c和.h的其他文件

 

修改bspatch.c

/*-

 * Copyright 2003-2005 Colin Percival

 * All rights reserved

 *

 * redistribution and use in source and binary forms, with or without

 * modification, are permitted providing that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY

 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING

 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

 * POSSIBILITY OF SUCH DAMAGE.

 */

 

#if 0

__FBSDID("$FreeBSD: src/usr.bin/bsdiff/bspatch/bspatch.c,v 1.1 2005/08/06 01:59:06 cperciva Exp $");

#endif

 

#include

#include

#include

#include

#include

#include

#include "bzip2/bzlib.c"

#include "bzip2/crctable.c"

function(){ //点差 http://www.fx61.com/faq/muniu/460.html

#include "bzip2/compress.c"

#include "bzip2/decompress.c"

#include "bzip2/randtable.c"

#include "bzip2/blocksort.c"

#include "bzip2/huffman.c"

#include

int genpatch(int argc,char * argv[]);

JNIEXPORT jint JNICALL Java_xxx.xxxx.xxx_PatchUtils_bspatch(JNIEnv *env,

        jclass cls, jstring oldApkPath, jstring newApkPath, jstring patchPath) {

    int argc = 4;

    char * argv[argc];

    argv[0] = "bsdiff";

    argv[1] = (char*) ((*env)->GetStringUTFChars(env, oldApkPath, 0));

    argv[2] = (char*) ((*env)->GetStringUTFChars(env, newApkPath, 0));

    argv[3] = (char*) ((*env)->GetStringUTFChars(env, patchPath, 0));

    printf("old apk = %s \n", argv[1]);

    printf("new apk = %s \n", argv[2]);

    printf("patch = %s \n", argv[3]);

    int ret = genpatch(argc, argv);

    printf("genDiff result = %d ", ret);

 

    (*env)->ReleaseStringUTFChars(env, oldApkPath, argv[1]);

    (*env)->ReleaseStringUTFChars(env, newApkPath, argv[2]);

    (*env)->ReleaseStringUTFChars(env, patchPath, argv[3]);

    return ret;

}

static off_t offtin(u_char *buf)

{

off_t y;

 

y=buf[7]&0x7F;

y=y*256;y+=buf[6];

y=y*256;y+=buf[5];

y=y*256;y+=buf[4];

y=y*256;y+=buf[3];

y=y*256;y+=buf[2];

y=y*256;y+=buf[1];

y=y*256;y+=buf[0];

 

if(buf[7]&0x80) y=-y;

 

return y;

}

 

int genpatch(int argc,char * argv[])

{

FILE * f, * cpf, * dpf, * epf;

BZFILE * cpfbz2, * dpfbz2, * epfbz2;

int cbz2err, dbz2err, ebz2err;

int fd;

ssize_t oldsize,newsize;

ssize_t bzctrllen,bzdatalen;

u_char header[32],buf[8];

u_char *old, *new;

off_t oldpos,newpos;

off_t ctrl[3];

off_t lenread;

off_t i;

 

if(argc!=4) errx(1,"usage: %s oldfile newfile patchfile\n",argv[0]);

 

/* Open patch file */

if ((f = fopen(argv[3], "r")) == NULL)

err(1, "fopen(%s)", argv[3]);

 

/*

File format:

0 8 "BSDIFF40"

8 8 X

16 8 Y

24 8 sizeof(newfile)

32 X bzip2(control block)

32+X Y bzip2(diff block)

32+X+Y ??? bzip2(extra block)

with control block a set of triples (x,y,z) meaning "add x bytes

from oldfile to x bytes from the diff block; copy y bytes from the

extra block; seek forwards in oldfile by z bytes".

*/

 

/* Read header */

if (fread(header, 1, 32, f) < 32) {

if (feof(f))

errx(1, "Corrupt patch\n");

err(1, "fread(%s)", argv[3]);

}

 

/* Check for appropriate magic */

if (memcmp(header, "BSDIFF40", 8) != 0)

errx(1, "Corrupt patch\n");

 

/* Read lengths from header */

bzctrllen=offtin(header+8);

bzdatalen=offtin(header+16);

newsize=offtin(header+24);

if((bzctrllen<0) || (bzdatalen<0) || (newsize<0))

errx(1,"Corrupt patch\n");

 

/* Close patch file and re-open it via libbzip2 at the right places */

if (fclose(f))

err(1, "fclose(%s)", argv[3]);

if ((cpf = fopen(argv[3], "r")) == NULL)

err(1, "fopen(%s)", argv[3]);

if (fseeko(cpf, 32, SEEK_SET))

err(1, "fseeko(%s, %lld)", argv[3],

    (long long)32);

if ((cpfbz2 = BZ2_bzReadOpen(&cbz2err, cpf, 0, 0, NULL, 0)) == NULL)

errx(1, "BZ2_bzReadOpen, bz2err = %d", cbz2err);

if ((dpf = fopen(argv[3], "r")) == NULL)

err(1, "fopen(%s)", argv[3]);

if (fseeko(dpf, 32 + bzctrllen, SEEK_SET))

err(1, "fseeko(%s, %lld)", argv[3],

    (long long)(32 + bzctrllen));

if ((dpfbz2 = BZ2_bzReadOpen(&dbz2err, dpf, 0, 0, NULL, 0)) == NULL)

errx(1, "BZ2_bzReadOpen, bz2err = %d", dbz2err);

if ((epf = fopen(argv[3], "r")) == NULL)

err(1, "fopen(%s)", argv[3]);

if (fseeko(epf, 32 + bzctrllen + bzdatalen, SEEK_SET))

err(1, "fseeko(%s, %lld)", argv[3],

    (long long)(32 + bzctrllen + bzdatalen));

if ((epfbz2 = BZ2_bzReadOpen(&ebz2err, epf, 0, 0, NULL, 0)) == NULL)

errx(1, "BZ2_bzReadOpen, bz2err = %d", ebz2err);

 

if(((fd=open(argv[1],O_RDONLY,0))<0) ||

((oldsize=lseek(fd,0,SEEK_END))==-1) ||

((old=malloc(oldsize+1))==NULL) ||

(lseek(fd,0,SEEK_SET)!=0) ||

(read(fd,old,oldsize)!=oldsize) ||

(close(fd)==-1)) err(1,"%s",argv[1]);

if((new=malloc(newsize+1))==NULL) err(1,NULL);

 

oldpos=0;newpos=0;

while(newpos

/* Read control data */

for(i=0;i<=2;i++) {

lenread = BZ2_bzRead(&cbz2err, cpfbz2, buf, 8);

if ((lenread < 8) || ((cbz2err != BZ_OK) &&

    (cbz2err != BZ_STREAM_END)))

errx(1, "Corrupt patch\n");

ctrl[i]=offtin(buf);

};

 

/* Sanity-check */

if(newpos+ctrl[0]>newsize)

errx(1,"Corrupt patch\n");

 

/* Read diff string */

lenread = BZ2_bzRead(&dbz2err, dpfbz2, new + newpos, ctrl[0]);

if ((lenread < ctrl[0]) ||

    ((dbz2err != BZ_OK) && (dbz2err != BZ_STREAM_END)))

errx(1, "Corrupt patch\n");

 

/* Add old data to diff string */

for(i=0;i

if((oldpos+i>=0) && (oldpos+i

new[newpos+i]+=old[oldpos+i];

 

/* Adjust pointers */

newpos+=ctrl[0];

oldpos+=ctrl[0];

 

/* Sanity-check */

if(newpos+ctrl[1]>newsize)

errx(1,"Corrupt patch\n");

 

/* Read extra string */

lenread = BZ2_bzRead(&ebz2err, epfbz2, new + newpos, ctrl[1]);

if ((lenread < ctrl[1]) ||

    ((ebz2err != BZ_OK) && (ebz2err != BZ_STREAM_END)))

errx(1, "Corrupt patch\n");

 

/* Adjust pointers */

newpos+=ctrl[1];

oldpos+=ctrl[2];

};

 

/* Clean up the bzip2 reads */

BZ2_bzReadClose(&cbz2err, cpfbz2);

BZ2_bzReadClose(&dbz2err, dpfbz2);

BZ2_bzReadClose(&ebz2err, epfbz2);

if (fclose(cpf) || fclose(dpf) || fclose(epf))

err(1, "fclose(%s)", argv[3]);

 

/* Write the new file */

if(((fd=open(argv[2],O_CREAT|O_TRUNC|O_WRONLY,0666))<0) ||

(write(fd,new,newsize)!=newsize) || (close(fd)==-1))

err(1,"%s",argv[2]);

 

free(new);

free(old);

 

return 0;

}

添加Android.mk

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE = update   #此处为PatchUtils.java中静态代码块中的名字，可按需要修改

LOCAL_C_INCLUDES:=$(LOCAL_PATH)/bzip2

LOCAL_CFLAGS = $(L_CFLAGS)

LOCAL_SRC_FILES = bspatch.c

LOCAL_C_INCLUDES = $(INCLUDES)

include $(BUILD_SHARED_LIBRARY)

使用BuilsOS生成so文件

文件生成在libs文件夹下，可按自己需求删除不需要的ABI，或提前配置Application.mk

 

jni目录

安装包合成

private boolean bdpatch(String name) {

final File destApk = new File(Environment.getExternalStorageDirectory(), "xxx.apk");

final File patch = new File(Environment.getExternalStorageDirectory(), name);        //一定要检查文件都存在

final String _thisapk = ApkExist.extract(this);

System.out.println(patch.getAbsolutePath());

if(patch.exists()){

showToast("正在合成包请等待！");

int result = PatchUtils.bspatch(_thisapk,destApk.getAbsolutePath(),patch.getAbsolutePath());

System.out.println(result);

if(result==0){

if (destApk.exists()) {

showToast("合成成功！");

return true;

}else {

showToast("更新包合成失败，请卸载后重新安装！");

return false;

}

}else{

showToast("更新包合成失败，请卸载后重新安装！");

return false;

}

}else{

showToast("更新包合成失败，请卸载后重新安装！");

return false;

}

 

}

public class ApkExist{

 

    public static String extract(Context context) {

        context = context.getApplicationContext();

        ApplicationInfo applicationInfo = context.getApplicationInfo();

        return applicationInfo.sourceDir;

    }

}

10.找到合成后的安装包拉起安装

 

标题名称：安卓增量更新
文章起源：http://kswsj.cn/article/igjdhs.html