（创建于2017/12/17）
1.服务器生成差分包
服务器生成通常是在web项目中进行的，和客户端开发类似，先生成动态库，然后调用，我们创建一个web项目如下目录结构
创建过程中涉及到一些问题
a.eclipse无法创建web项目，说明你的eclipse并没有下载一下需要的插件，百度可以找到答案
（1）在确定联网的情况下，在help->install new software下根据你的eclipse版本选择下拉框选项，例如eclipse indigo，所选情况如下：
或者我的是luna
（2）在下面的下拉框中 Web, XML, Java EE and OSGi Enterprise Development选择如下几个插件；
（3）安装这几个插件，耐心等待........安装完成之后，会自动弹出对话框让你重启eclipse，重启下就行，此时，就可以新建web项目了，如下：
(4)到了这里还没有完，你会发现创建项目的时候无法选择到tomcat服务器，这同样是缺少插件的原因同样在
Web, XML, Java EE and OSGi Enterprise Development
选择JST Server AdaptersExtensions，或者还有一个相似的也选上
这时就可以创建web工程了，这只是一个小插曲，其实我们可以直接写Java工程的，不过为了模拟的真实一些
2.接下来创建native方法，生成头文件，放入到visual studio中编写代码
public class DiffUtils {
static{
System.loadLibrary("ndk_update");
}
public native static void diff(String old,String newFile,String patchFile);
}
/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class ndk_update_server_DiffUtils */
#ifndef _Included_ndk_update_server_DiffUtils
#define _Included_ndk_update_server_DiffUtils
#ifdef __cplusplus
extern "C" {
#endif
/*
* Class: ndk_update_server_DiffUtils
* Method: diff
* Signature: (Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)V
*/
JNIEXPORT void JNICALL Java_ndk_1update_1server_DiffUtils_diff
(JNIEnv *, jclass, jstring, jstring, jstring);
#ifdef __cplusplus
}
#endif
#endif
3.as工程目录概览
源文件中8个文件和头文件中的两个文件bzlib.h和bzilib_private.h都是bsdiff中拷贝过来的，有一点需要注意，as
时windows环境，所以我们下载的bsdiff需要时Windows版的
在bsdiff.cpp文件中写代码，如下
/*-
* 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.
*/
#include <stdlib.h>
#include "bzlib.h"
#include <stdio.h>
#include <string.h>
//#include <err.h>
//#include <unistd.h>
#include <io.h>
#include <fcntl.h>
//#include <sys/wait.h>
#include "ndk_update_server_DiffUtils.h"
#include <windows.h>
#include <process.h>
#include <sys/types.h>
typedef unsigned char u_char;
typedef long pid_t;
template<class T>
void err(int i, const char* str, T arg) {
char lastErrorTxt[1024];
FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,NULL,GetLastError(),0,lastErrorTxt,1024,NULL);
printf("%s",lastErrorTxt);
printf(str, arg);
exit(i);
}
void err(int i, const char* str) {
char lastErrorTxt[1024];
FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,NULL,GetLastError(),0,lastErrorTxt,1024,NULL);
printf("%s",lastErrorTxt);
if (str!=NULL) {
printf("%s",str);
}
exit(i);
}
template<class T>
void errx(int i, const char* str, T arg) {
printf(str, arg);
exit(i);
}
void errx(int i, const char* str) {
printf("%s",str);
exit(i);
}
#define MIN(x,y) (((x)<(y)) ? (x) : (y))
static void split(off_t *I,off_t *V,off_t start,off_t len,off_t h)
{
off_t i,j,k,x,tmp,jj,kk;
if(len<16) {
for(k=start;k<start+len;k+=j) {
j=1;x=V[I[k]+h];
for(i=1;k+i<start+len;i++) {
if(V[I[k+i]+h]<x) {
x=V[I[k+i]+h];
j=0;
};
if(V[I[k+i]+h]==x) {
tmp=I[k+j];I[k+j]=I[k+i];I[k+i]=tmp;
j++;
};
};
for(i=0;i<j;i++) V[I[k+i]]=k+j-1;
if(j==1) I[k]=-1;
};
return;
};
x=V[I[start+len/2]+h];
jj=0;kk=0;
for(i=start;i<start+len;i++) {
if(V[I[i]+h]<x) jj++;
if(V[I[i]+h]==x) kk++;
};
jj+=start;kk+=jj;
i=start;j=0;k=0;
while(i<jj) {
if(V[I[i]+h]<x) {
i++;
} else if(V[I[i]+h]==x) {
tmp=I[i];I[i]=I[jj+j];I[jj+j]=tmp;
j++;
} else {
tmp=I[i];I[i]=I[kk+k];I[kk+k]=tmp;
k++;
};
};
while(jj+j<kk) {
if(V[I[jj+j]+h]==x) {
j++;
} else {
tmp=I[jj+j];I[jj+j]=I[kk+k];I[kk+k]=tmp;
k++;
};
};
if(jj>start) split(I,V,start,jj-start,h);
for(i=0;i<kk-jj;i++) V[I[jj+i]]=kk-1;
if(jj==kk-1) I[jj]=-1;
if(start+len>kk) split(I,V,kk,start+len-kk,h);
}
static void qsufsort(off_t *I,off_t *V,u_char *old,off_t oldsize)
{
off_t buckets[256];
off_t i,h,len;
for(i=0;i<256;i++) buckets[i]=0;
for(i=0;i<oldsize;i++) buckets[old[i]]++;
for(i=1;i<256;i++) buckets[i]+=buckets[i-1];
for(i=255;i>0;i--) buckets[i]=buckets[i-1];
buckets[0]=0;
for(i=0;i<oldsize;i++) I[++buckets[old[i]]]=i;
I[0]=oldsize;
for(i=0;i<oldsize;i++) V[i]=buckets[old[i]];
V[oldsize]=0;
for(i=1;i<256;i++) if(buckets[i]==buckets[i-1]+1) I[buckets[i]]=-1;
I[0]=-1;
for(h=1;I[0]!=-(oldsize+1);h+=h) {
len=0;
for(i=0;i<oldsize+1;) {
if(I[i]<0) {
len-=I[i];
i-=I[i];
} else {
if(len) I[i-len]=-len;
len=V[I[i]]+1-i;
split(I,V,i,len,h);
i+=len;
len=0;
};
};
if(len) I[i-len]=-len;
};
for(i=0;i<oldsize+1;i++) I[V[i]]=i;
}
static off_t matchlen(u_char *old,off_t oldsize,u_char *_new,off_t newsize)
{
off_t i;
for(i=0;(i<oldsize)&&(i<newsize);i++)
if(old[i]!=_new[i]) break;
return i;
}
static off_t search(off_t *I,u_char *old,off_t oldsize,
u_char *_new,off_t newsize,off_t st,off_t en,off_t *pos)
{
off_t x,y;
if(en-st<2) {
x=matchlen(old+I[st],oldsize-I[st],_new,newsize);
y=matchlen(old+I[en],oldsize-I[en],_new,newsize);
if(x>y) {
*pos=I[st];
return x;
} else {
*pos=I[en];
return y;
}
};
x=st+(en-st)/2;
if(memcmp(old+I[x],_new,MIN(oldsize-I[x],newsize))<0) {
return search(I,old,oldsize,_new,newsize,x,en,pos);
} else {
return search(I,old,oldsize,_new,newsize,st,x,pos);
};
}
static void offtout(off_t x,u_char *buf)
{
off_t y;
if(x<0) y=-x; else y=x;
buf[0]=y%256;y-=buf[0];
y=y/256;buf[1]=y%256;y-=buf[1];
y=y/256;buf[2]=y%256;y-=buf[2];
y=y/256;buf[3]=y%256;y-=buf[3];
y=y/256;buf[4]=y%256;y-=buf[4];
y=y/256;buf[5]=y%256;y-=buf[5];
y=y/256;buf[6]=y%256;y-=buf[6];
y=y/256;buf[7]=y%256;
if(x<0) buf[7]|=0x80;
}
int diff(int argc,char *argv[])
{
int fd;
u_char *old,*_new;
off_t oldsize,newsize;
off_t *I,*V;
off_t scan,pos,len;
off_t lastscan,lastpos,lastoffset;
off_t oldscore,scsc;
off_t s,Sf,lenf,Sb,lenb;
off_t overlap,Ss,lens;
off_t i;
off_t dblen,eblen;
u_char *db,*eb;
u_char buf[8];
u_char header[32];
FILE * pf;
BZFILE * pfbz2;
int bz2err;
if(argc!=4) errx(1,"usage: %s oldfile newfile patchfile\n",argv[0]);
/* Allocate oldsize+1 bytes instead of oldsize bytes to ensure
that we never try to malloc(0) and get a NULL pointer */
//org:
//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]);
//new:
//Read in chunks, don't rely on read always returns full data!
if(((fd=open(argv[1],O_RDONLY|O_BINARY|O_NOINHERIT,0))<0) ||
((oldsize=lseek(fd,0,SEEK_END))==-1) ||
((old=(u_char*)malloc(oldsize+1))==NULL) ||
(lseek(fd,0,SEEK_SET)!=0))
err(1,"%s",argv[1]);
int r=oldsize;
while (r>0 && (i=read(fd,old+oldsize-r,r))>0) r-=i;
if (r>0 || close(fd)==-1) err(1,"%s",argv[1]);
if(((I=(off_t*)malloc((oldsize+1)*sizeof(off_t)))==NULL) ||
((V=(off_t*)malloc((oldsize+1)*sizeof(off_t)))==NULL)) err(1,NULL);
qsufsort(I,V,old,oldsize);
free(V);
/* Allocate newsize+1 bytes instead of newsize bytes to ensure
that we never try to malloc(0) and get a NULL pointer */
//org:
//if(((fd=open(argv[2],O_RDONLY,0))<0) ||
// ((newsize=lseek(fd,0,SEEK_END))==-1) ||
// ((_new=malloc(newsize+1))==NULL) ||
// (lseek(fd,0,SEEK_SET)!=0) ||
// (read(fd,_new,newsize)!=newsize) ||
// (close(fd)==-1)) err(1,"%s",argv[2]);
//new:
//Read in chunks, don't rely on read always returns full data!
if(((fd=open(argv[2],O_RDONLY|O_BINARY|O_NOINHERIT,0))<0) ||
((newsize=lseek(fd,0,SEEK_END))==-1) ||
((_new=(u_char*)malloc(newsize+1))==NULL) ||
(lseek(fd,0,SEEK_SET)!=0))
err(1,"%s",argv[2]);
r=newsize;
while (r>0 && (i=read(fd,_new+newsize-r,r))>0) r-=i;
if (r>0 || close(fd)==-1) err(1,"%s",argv[1]);
if(((db=(u_char*)malloc(newsize+1))==NULL) ||
((eb=(u_char*)malloc(newsize+1))==NULL)) err(1,NULL);
dblen=0;
eblen=0;
/* Create the patch file */
//org:
//if ((pf = fopen(argv[3], "w")) == NULL)
//new:
//if((fd=open(argv[3],O_CREAT|O_TRUNC|O_WRONLY|O_BINARY|O_NOINHERIT,0666))<0)
if ((pf = fopen(argv[3], "wb")) == NULL)
err(1,"%s",argv[3]);
/* Header is
0 8 "BSDIFF40"
8 8 length of bzip2ed ctrl block
16 8 length of bzip2ed diff block
24 8 length of new file */
/* File is
0 32 Header
32 ?? Bzip2ed ctrl block
?? ?? Bzip2ed diff block
?? ?? Bzip2ed extra block */
memcpy(header,"BSDIFF40",8);
offtout(0, header + 8);
offtout(0, header + 16);
offtout(newsize, header + 24);
if (fwrite(header, 32, 1, pf) != 1)
err(1, "fwrite(%s)", argv[3]);
/* Compute the differences, writing ctrl as we go */
if ((pfbz2 = BZ2_bzWriteOpen(&bz2err, pf, 9, 0, 0)) == NULL)
errx(1, "BZ2_bzWriteOpen, bz2err = %d", bz2err);
scan=0;len=0;
lastscan=0;lastpos=0;lastoffset=0;
while(scan<newsize) {
oldscore=0;
for(scsc=scan+=len;scan<newsize;scan++) {
len=search(I,old,oldsize,_new+scan,newsize-scan,
0,oldsize,&pos);
for(;scsc<scan+len;scsc++)
if((scsc+lastoffset<oldsize) &&
(old[scsc+lastoffset] == _new[scsc]))
oldscore++;
if(((len==oldscore) && (len!=0)) ||
(len>oldscore+8)) break;
if((scan+lastoffset<oldsize) &&
(old[scan+lastoffset] == _new[scan]))
oldscore--;
};
if((len!=oldscore) || (scan==newsize)) {
s=0;Sf=0;lenf=0;
for(i=0;(lastscan+i<scan)&&(lastpos+i<oldsize);) {
if(old[lastpos+i]==_new[lastscan+i]) s++;
i++;
if(s*2-i>Sf*2-lenf) { Sf=s; lenf=i; };
};
lenb=0;
if(scan<newsize) {
s=0;Sb=0;
for(i=1;(scan>=lastscan+i)&&(pos>=i);i++) {
if(old[pos-i]==_new[scan-i]) s++;
if(s*2-i>Sb*2-lenb) { Sb=s; lenb=i; };
};
};
if(lastscan+lenf>scan-lenb) {
overlap=(lastscan+lenf)-(scan-lenb);
s=0;Ss=0;lens=0;
for(i=0;i<overlap;i++) {
if(_new[lastscan+lenf-overlap+i]==
old[lastpos+lenf-overlap+i]) s++;
if(_new[scan-lenb+i]==
old[pos-lenb+i]) s--;
if(s>Ss) { Ss=s; lens=i+1; };
};
lenf+=lens-overlap;
lenb-=lens;
};
for(i=0;i<lenf;i++)
db[dblen+i]=_new[lastscan+i]-old[lastpos+i];
for(i=0;i<(scan-lenb)-(lastscan+lenf);i++)
eb[eblen+i]=_new[lastscan+lenf+i];
dblen+=lenf;
eblen+=(scan-lenb)-(lastscan+lenf);
offtout(lenf,buf);
BZ2_bzWrite(&bz2err, pfbz2, buf, 8);
if (bz2err != BZ_OK)
errx(1, "BZ2_bzWrite, bz2err = %d", bz2err);
offtout((scan-lenb)-(lastscan+lenf),buf);
BZ2_bzWrite(&bz2err, pfbz2, buf, 8);
if (bz2err != BZ_OK)
errx(1, "BZ2_bzWrite, bz2err = %d", bz2err);
offtout((pos-lenb)-(lastpos+lenf),buf);
BZ2_bzWrite(&bz2err, pfbz2, buf, 8);
if (bz2err != BZ_OK)
errx(1, "BZ2_bzWrite, bz2err = %d", bz2err);
lastscan=scan-lenb;
lastpos=pos-lenb;
lastoffset=pos-scan;
};
};
BZ2_bzWriteClose(&bz2err, pfbz2, 0, NULL, NULL);
if (bz2err != BZ_OK)
errx(1, "BZ2_bzWriteClose, bz2err = %d", bz2err);
/* Compute size of compressed ctrl data */
if ((len = ftell(pf)) == -1)
err(1, "ftello");
offtout(len-32, header + 8);
/* Write compressed diff data */
if ((pfbz2 = BZ2_bzWriteOpen(&bz2err, pf, 9, 0, 0)) == NULL)
errx(1, "BZ2_bzWriteOpen, bz2err = %d", bz2err);
BZ2_bzWrite(&bz2err, pfbz2, db, dblen);
if (bz2err != BZ_OK)
errx(1, "BZ2_bzWrite, bz2err = %d", bz2err);
BZ2_bzWriteClose(&bz2err, pfbz2, 0, NULL, NULL);
if (bz2err != BZ_OK)
errx(1, "BZ2_bzWriteClose, bz2err = %d", bz2err);
/* Compute size of compressed diff data */
if ((newsize = ftell(pf)) == -1)
err(1, "ftello");
offtout(newsize - len, header + 16);
/* Write compressed extra data */
if ((pfbz2 = BZ2_bzWriteOpen(&bz2err, pf, 9, 0, 0)) == NULL)
errx(1, "BZ2_bzWriteOpen, bz2err = %d", bz2err);
BZ2_bzWrite(&bz2err, pfbz2, eb, eblen);
if (bz2err != BZ_OK)
errx(1, "BZ2_bzWrite, bz2err = %d", bz2err);
BZ2_bzWriteClose(&bz2err, pfbz2, 0, NULL, NULL);
if (bz2err != BZ_OK)
errx(1, "BZ2_bzWriteClose, bz2err = %d", bz2err);
/* Seek to the beginning, write the header, and close the file */
if (fseek(pf, 0, SEEK_SET))
err(1, "fseeko");
if (fwrite(header, 32, 1, pf) != 1)
err(1, "fwrite(%s)", argv[3]);
if (fclose(pf))
err(1, "fclose");
/* Free the memory we used */
free(db);
free(eb);
free(I);
free(old);
free(_new);
return 0;
}
JNIEXPORT void JNICALL Java_ndk_1update_1server_DiffUtils_diff
(JNIEnv *env, jclass jcls, jstring old_path, jstring new_path, jstring patch_path) {
int argc = 4;
char * oldfile =(char *)( env->GetStringUTFChars(old_path, NULL));
char * newfile = (char *)(env->GetStringUTFChars(new_path, NULL));
char * patchfile = (char *)(env->GetStringUTFChars(patch_path, NULL));
//定义参数
char *argv[4];
argv[0] = "renzhenming";
argv[1]=oldfile;
argv[2]= newfile;
argv[3]=patchfile;
diff(argc, argv);
env->ReleaseStringUTFChars(old_path, oldfile);
env->ReleaseStringUTFChars(new_path, newfile);
env->ReleaseStringUTFChars(patch_path, patchfile);
}
然后生成动态库，放到eclipse web工程目录下，写工程调用生成差分包
public class UpdateTest {
public static void main(String[] args) {
DiffUtils.diff(ConstantsWin.OLD_APK_PATH, ConstantsWin.NEW_APK_PATH, ConstantsWin.PATCH_PATH);
System.out.println("差分包生成成功");
}
}
2.客户端合并差分包生成新包
创建native方法生成头文件
public class BsPatch {
/**
* 合并
*
* @param oldfile
* @param newfile
* @param patchfile
*/
public native static void patch(String oldfile, String newfile, String patchfile);
static{
System.loadLibrary("bspatch");
}
}
/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class com_example_ndk_patch_utils_BsPatch */
#ifndef _Included_com_example_ndk_patch_utils_BsPatch
#define _Included_com_example_ndk_patch_utils_BsPatch
#ifdef __cplusplus
extern "C" {
#endif
/*
* Class: com_example_ndk_patch_utils_BsPatch
* Method: patch
* Signature: (Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)V
*/
JNIEXPORT void JNICALL Java_com_example_ndk_1patch_utils_BsPatch_patch
(JNIEnv *, jclass, jstring, jstring, jstring);
#ifdef __cplusplus
}
#endif
#endif
创建jni目录，将头文件复制进去，添加bspatch.c文件和相关的bzip文件，注意，Android系统是基于Linux的，所以这里的文件需要是Linux版本的
然后在右键add native support,然后在添加ndk的相关头文件的目录
D:\application\java\android-ndk-r10e\toolchains\arm-linux-androideabi-4.8\prebuilt\windows-x86_64\lib\gcc\arm-linux-androideabi\4.8\include
D:\application\java\android-ndk-r10e\toolchains\arm-linux-androideabi-4.8\prebuilt\windows-x86_64\lib\gcc\arm-linux-androideabi\4.8\include-fixed
D:\application\java\android-ndk-r10e\platforms\android-18\arch-arm\usr\include
然后似乎就没有问题了，这里遇到过问题，有可能是add native和添加ndk目录的时机不对，导致c文件中或者头文件中的属性类之类的爆红，显示无法resolve，不知道
何故，不过后来按上边的顺序就可以了，也是坑
bspathc中添加合并的代码，注意一些相关头文件的引入
/*-
* 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 "com_example_ndk_patch_utils_BsPatch.h"
#include "bzip2/bzlib.c"
#include "bzip2/crctable.c"
#include "bzip2/compress.c"
#include "bzip2/decompress.c"
#include "bzip2/randtable.c"
#include "bzip2/blocksort.c"
#include "bzip2/huffman.c"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <err.h>
#include <unistd.h>
#include <fcntl.h>
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 bspatch_main(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<newsize) {
/* 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<ctrl[0];i++)
if((oldpos+i>=0) && (oldpos+i<oldsize))
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;
}
JNIEXPORT void JNICALL Java_com_example_ndk_1patch_utils_BsPatch_patch
(JNIEnv *env, jclass jcls, jstring oldfile_jstr, jstring newfile_jstr, jstring patchfile_jstr){
int argc = 4;
char *oldfile = (char*)(*env)->GetStringUTFChars(env,oldfile_jstr,NULL);
char *newfile = (char*)(*env)->GetStringUTFChars(env,newfile_jstr,NULL);
char *patchfile = (char*)(*env)->GetStringUTFChars(env,patchfile_jstr,NULL);
char *argv[4];
argv[0] = "bspatch";
argv[1] = oldfile;
argv[2] = newfile;
argv[3] = patchfile;
bspatch_main(argc,argv);
(*env)->ReleaseStringUTFChars(env,oldfile_jstr,oldfile);
(*env)->ReleaseStringUTFChars(env,newfile_jstr,newfile);
(*env)->ReleaseStringUTFChars(env,patchfile_jstr,patchfile);
}
其他文件上源码好了，自己看吧，我是懒得写了,这个笔记的过程，并不是一步一步就可以实现的，而是我实现之后按照记忆写的，有些地方肯定还有坑
MainActivity.java
package com.example.ndk_patch;
import java.io.File;
import com.example.ndk_patch.utils.ApkUtils;
import com.example.ndk_patch.utils.BsPatch;
import com.example.ndk_patch.utils.Constants;
import com.example.ndk_patch.utils.DownloadUtils;
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.widget.Toast;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
new ApkUpdateTask().execute();
}
}, 2000);
}
class ApkUpdateTask extends AsyncTask<Void, Void, Boolean>{
@Override
protected Boolean doInBackground(Void... params) {
try {
System.out.println("开始合并");
File patchFile = new File(Constants.PATCH_FILE_PATH);
if (patchFile.exists()) {
//获取当前应用的apk文件/data/app/app
String oldfile = ApkUtils.getSourceApkPath(MainActivity.this, getPackageName());
//2.合并得到最新版本的APK文件
String newfile = Constants.NEW_APK_PATH;
String patchfile = patchFile.getAbsolutePath();
BsPatch.patch(oldfile, newfile, patchfile);
}else{
return false;
}
} catch (Exception e) {
e.printStackTrace();
return false;
}
return true;
}
@Override
protected void onPostExecute(Boolean result) {
super.onPostExecute(result);
//3.安装
if(result){
System.out.println("合并成功");
Toast.makeText(MainActivity.this, "合并成功，您正在进行无流量更新", Toast.LENGTH_SHORT).show();
ApkUtils.installApk(MainActivity.this, Constants.NEW_APK_PATH);
}
}
}
}
ApkUtils.java
package com.example.ndk_patch.utils;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.net.Uri;
import android.text.TextUtils;
public class ApkUtils {
public static boolean isInstalled(Context context, String packageName) {
PackageManager pm = context.getPackageManager();
boolean installed = false;
try {
pm.getPackageInfo(packageName, PackageManager.GET_ACTIVITIES);
installed = true;
} catch (Exception e) {
e.printStackTrace();
}
return installed;
}
/**
* 获取已安装Apk文件的源Apk文件
* 如：/data/app/my.apk
*
* @param context
* @param packageName
* @return
*/
public static String getSourceApkPath(Context context, String packageName) {
if (TextUtils.isEmpty(packageName))
return null;
try {
ApplicationInfo appInfo = context.getPackageManager()
.getApplicationInfo(packageName, 0);
return appInfo.sourceDir;
} catch (NameNotFoundException e) {
e.printStackTrace();
}
return null;
}
/**
* 安装Apk
*
* @param context
* @param apkPath
*/
public static void installApk(Context context, String apkPath) {
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.parse("file://" + apkPath),
"application/vnd.android.package-archive");
context.startActivity(intent);
}
}
BsPatch.java
package com.example.ndk_patch.utils;
public class BsPatch {
/**
* 合并
*
* @param oldfile
* @param newfile
* @param patchfile
*/
public native static void patch(String oldfile, String newfile, String patchfile);
static{
System.loadLibrary("bspatch");
}
}
Constants.java
import java.io.File;
import android.os.Environment;
public class Constants {
public static final String SD_CARD = Environment.getExternalStorageDirectory() + File.separator;
public static final String NEW_APK_PATH = SD_CARD+"apk_new.apk";
public static final String PATCH_FILE = "apk.patch";
public static final String PATCH_FILE_PATH = SD_CARD+PATCH_FILE;
}
