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Android应用增量升级

 
阅读更多


阅读此文之前请先阅读 http://blog.csdn.net/hmg25/article/details/8100896


何为增量升级，简单说下，当应用版本要更新时通常的做法是重新下载新的版本去覆盖旧版本，但这样有个比较明显缺点，太浪费流量了，尤其是在GPRS模式下。我们能不能只更新新版本增加的内容呢，bsdiff/bzlib2可以帮助我们实现这点。下面介绍下具体的做法


第一、生成旧版和新版的差分比patch文件，可以借助bsdiff开源库windows版本

[html]view plaincopy
  1. bsdiff.exe../iReader1.6.2.0(v35).apk../iReader1.8.0.1(v40).apk../ireader.patch

第二、有了patch文件，我们就可以在Android平台上利用JNI调用bzlib2就可以实现增量升级了。

1、首先要有ndk编译环境，具体怎么搭建详见：http://blog.csdn.net/tibib/article/details/8504680

2、编写本地方法

[java]view plaincopy
  1. //oldapk_filepath：旧版本存储路径newapk_savepath：生成的新版本要存放的路径patchpath:差分比文件存放路径
  2. publicnativeintapplyPatchToOldApk(Stringoldapk_filepath,Stringnewapk_savepath,Stringpatchpath);
3、编写Android.mk配置文件，并把需要的bzlib2源代码文件()拷贝到目录下

[html]view plaincopy
  1. LOCAL_PATH:=$(callmy-dir)
  2. include$(CLEAR_VARS)
  4. #Thisisthetargetbeingbuilt.
  5. LOCAL_MODULE:=libBsdiff
  8. #Allofthesourcefilesthatwewillcompile.
  9. #具体到底需要哪些c代码，没有仔细研究过
  10. LOCAL_SRC_FILES:=tu_bingbing_bsdiff_BsdiffBusiness.c\
  11. bzlib.c\
  12. blocksort.c\
  13. compress.c\
  14. crctable.c\
  15. decompress.c\
  16. huffman.c\
  17. randtable.c\
  18. bzip2.c\
  20. #Nostaticlibraries.
  21. LOCAL_STATIC_LIBRARIES:=\
  22. libbz
  25. #AlsoneedtheJNIheaders.
  26. LOCAL_C_INCLUDES+=\
  27. $(JNI_H_INCLUDE)external/bzip2
  29. #Nospecialcompilerflags.
  30. LOCAL_CFLAGS+=
  32. include$(BUILD_SHARED_LIBRARY)
4、实现本地方法

[cpp]view plaincopy
  1. #include<stdio.h>
  2. #include"tu_bingbing_bsdiff_BsdiffBusiness.h"
  4. #include"bzlib_private.h"
  6. #include<stdlib.h>
  7. #include<stdio.h>
  8. #include<string.h>
  9. #include<err.h>
  10. #include<unistd.h>
  11. #include<fcntl.h>
  12. #include<android/log.h>
  15. staticoff_tofftin(u_char*buf)
  16. {
  17. off_ty;
  19. y=buf[7]&0x7F;
  20. y=y*256;y+=buf[6];
  21. y=y*256;y+=buf[5];
  22. y=y*256;y+=buf[4];
  23. y=y*256;y+=buf[3];
  24. y=y*256;y+=buf[2];
  25. y=y*256;y+=buf[1];
  26. y=y*256;y+=buf[0];
  28. if(buf[7]&0x80)y=-y;
  30. returny;
  31. }
  33. intapplypatch(intargc,char*argv[])
  34. {
  35. FILE*f,*cpf,*dpf,*epf;
  36. BZFILE*cpfbz2,*dpfbz2,*epfbz2;
  37. intcbz2err,dbz2err,ebz2err;
  38. intfd;
  39. ssize_toldsize,newsize;
  40. ssize_tbzctrllen,bzdatalen;
  41. u_charheader[32],buf[8];
  42. u_char*old,*new;
  43. off_toldpos,newpos;
  44. off_tctrl[3];
  45. off_tlenread;
  46. off_ti;
  48. if(argc!=4)errx(1,"usage:%soldfilenewfilepatchfile\n",argv[0]);
  50. /*Openpatchfile*/
  51. if((f=fopen(argv[3],"r"))==NULL)
  52. err(1,"fopen(%s)",argv[3]);
  54. /*
  55. Fileformat:
  56. 08"BSDIFF40"
  57. 88X
  58. 168Y
  59. 248sizeof(newfile)
  60. 32Xbzip2(controlblock)
  61. 32+XYbzip2(diffblock)
  62. 32+X+Y???bzip2(extrablock)
  63. withcontrolblockasetoftriples(x,y,z)meaning"addxbytes
  64. fromoldfiletoxbytesfromthediffblock;copyybytesfromthe
  65. extrablock;seekforwardsinoldfilebyzbytes".
  66. */
  68. /*Readheader*/
  69. if(fread(header,1,32,f)<32){
  70. if(feof(f))
  71. errx(1,"Corruptpatch\n");
  72. err(1,"fread(%s)",argv[3]);
  73. }
  75. /*Checkforappropriatemagic*/
  76. if(memcmp(header,"BSDIFF40",8)!=0)
  77. errx(1,"Corruptpatch\n");
  79. /*Readlengthsfromheader*/
  80. bzctrllen=offtin(header+8);
  81. bzdatalen=offtin(header+16);
  82. newsize=offtin(header+24);
  83. if((bzctrllen<0)||(bzdatalen<0)||(newsize<0))
  84. errx(1,"Corruptpatch\n");
  86. /*Closepatchfileandre-openitvialibbzip2attherightplaces*/
  87. if(fclose(f))
  88. err(1,"fclose(%s)",argv[3]);
  89. if((cpf=fopen(argv[3],"r"))==NULL)
  90. err(1,"fopen(%s)",argv[3]);
  91. if(fseeko(cpf,32,SEEK_SET))
  92. err(1,"fseeko(%s,%lld)",argv[3],
  93. (longlong)32);
  94. if((cpfbz2=BZ2_bzReadOpen(&cbz2err,cpf,0,0,NULL,0))==NULL)
  95. errx(1,"BZ2_bzReadOpen,bz2err=%d",cbz2err);
  96. if((dpf=fopen(argv[3],"r"))==NULL)
  97. err(1,"fopen(%s)",argv[3]);
  98. if(fseeko(dpf,32+bzctrllen,SEEK_SET))
  99. err(1,"fseeko(%s,%lld)",argv[3],
  100. (longlong)(32+bzctrllen));
  101. if((dpfbz2=BZ2_bzReadOpen(&dbz2err,dpf,0,0,NULL,0))==NULL)
  102. errx(1,"BZ2_bzReadOpen,bz2err=%d",dbz2err);
  103. if((epf=fopen(argv[3],"r"))==NULL)
  104. err(1,"fopen(%s)",argv[3]);
  105. if(fseeko(epf,32+bzctrllen+bzdatalen,SEEK_SET))
  106. err(1,"fseeko(%s,%lld)",argv[3],
  107. (longlong)(32+bzctrllen+bzdatalen));
  108. if((epfbz2=BZ2_bzReadOpen(&ebz2err,epf,0,0,NULL,0))==NULL)
  109. errx(1,"BZ2_bzReadOpen,bz2err=%d",ebz2err);
  111. if(((fd=open(argv[1],O_RDONLY,0))<0)||
  112. ((oldsize=lseek(fd,0,SEEK_END))==-1)||
  113. ((old=malloc(oldsize+1))==NULL)||
  114. (lseek(fd,0,SEEK_SET)!=0)||
  115. (read(fd,old,oldsize)!=oldsize)||
  116. (close(fd)==-1))err(1,"%s",argv[1]);
  117. if((new=malloc(newsize+1))==NULL)err(1,NULL);
  119. oldpos=0;newpos=0;
  120. while(newpos<newsize){
  121. /*Readcontroldata*/
  122. for(i=0;i<=2;i++){
  123. lenread=BZ2_bzRead(&cbz2err,cpfbz2,buf,8);
  124. if((lenread<8)||((cbz2err!=BZ_OK)&&
  125. (cbz2err!=BZ_STREAM_END)))
  126. errx(1,"Corruptpatch\n");
  127. ctrl[i]=offtin(buf);
  128. };
  130. /*Sanity-check*/
  131. if(newpos+ctrl[0]>newsize)
  132. errx(1,"Corruptpatch\n");
  134. /*Readdiffstring*/
  135. lenread=BZ2_bzRead(&dbz2err,dpfbz2,new+newpos,ctrl[0]);
  136. if((lenread<ctrl[0])||
  137. ((dbz2err!=BZ_OK)&&(dbz2err!=BZ_STREAM_END)))
  138. errx(1,"Corruptpatch\n");
  140. /*Addolddatatodiffstring*/
  141. for(i=0;i<ctrl[0];i++)
  142. if((oldpos+i>=0)&&(oldpos+i<oldsize))
  143. new[newpos+i]+=old[oldpos+i];
  145. /*Adjustpointers*/
  146. newpos+=ctrl[0];
  147. oldpos+=ctrl[0];
  149. /*Sanity-check*/
  150. if(newpos+ctrl[1]>newsize)
  151. errx(1,"Corruptpatch\n");
  153. /*Readextrastring*/
  154. lenread=BZ2_bzRead(&ebz2err,epfbz2,new+newpos,ctrl[1]);
  155. if((lenread<ctrl[1])||
  156. ((ebz2err!=BZ_OK)&&(ebz2err!=BZ_STREAM_END)))
  157. errx(1,"Corruptpatch\n");
  159. /*Adjustpointers*/
  160. newpos+=ctrl[1];
  161. oldpos+=ctrl[2];
  162. };
  164. /*Cleanupthebzip2reads*/
  165. BZ2_bzReadClose(&cbz2err,cpfbz2);
  166. BZ2_bzReadClose(&dbz2err,dpfbz2);
  167. BZ2_bzReadClose(&ebz2err,epfbz2);
  168. if(fclose(cpf)||fclose(dpf)||fclose(epf))
  169. err(1,"fclose(%s)",argv[3]);
  171. /*Writethenewfile*/
  172. if(((fd=open(argv[2],O_CREAT|O_TRUNC|O_WRONLY,0666))<0)||
  173. (write(fd,new,newsize)!=newsize)||(close(fd)==-1))
  174. err(1,"%s",argv[2]);
  176. free(new);
  177. free(old);
  179. return0;
  180. }
  182. //old升级之前apk包路径
  183. //new升级之后apk包路径
  184. //patch文件，可以用bsdiff工具生成
  185. //具体原理可以参看http://blog.csdn.net/hmg25/article/details/8100896
  186. JNIEXPORTjintJNICALLJava_tu_bingbing_bsdiff_BsdiffBusiness_applyPatchToOldApk(JNIEnv*env,
  187. jobjectobj,jstringold,jstringnew,jstringpatch){
  188. intargc=4;
  189. char*argv[argc];
  190. argv[0]="bspatch";
  191. argv[1]=(char*)((*env)->GetStringUTFChars(env,old,0));
  192. argv[2]=(char*)((*env)->GetStringUTFChars(env,new,0));
  193. argv[3]=(char*)((*env)->GetStringUTFChars(env,patch,0));
  195. intret=applypatch(argc,argv);
  197. (*env)->ReleaseStringUTFChars(env,old,argv[1]);
  198. (*env)->ReleaseStringUTFChars(env,new,argv[2]);
  199. (*env)->ReleaseStringUTFChars(env,patch,argv[3]);
  200. returnret;
  201. }

最后 ndk编译，在Android中调用native方法，你会发现在你传入路径下生成了新版本的apk。


DEMO：http://download.csdn.net/detail/tibib/5581905


Android应用增量升级

阅读此文之前请先阅读 http://blog.csdn.net/hmg25/article/details/8100896


何为增量升级，简单说下，当应用版本要更新时通常的做法是重新下载新的版本去覆盖旧版本，但这样有个比较明显缺点，太浪费流量了，尤其是在GPRS模式下。我们能不能只更新新版本增加的内容呢，bsdiff/bzlib2可以帮助我们实现这点。下面介绍下具体的做法


第一、生成旧版和新版的差分比patch文件，可以借助bsdiff开源库windows版本

[html]view plaincopy
  1. bsdiff.exe../iReader1.6.2.0(v35).apk../iReader1.8.0.1(v40).apk../ireader.patch

第二、有了patch文件，我们就可以在Android平台上利用JNI调用bzlib2就可以实现增量升级了。

1、首先要有ndk编译环境，具体怎么搭建详见：http://blog.csdn.net/tibib/article/details/8504680

2、编写本地方法

[java]view plaincopy
  1. //oldapk_filepath：旧版本存储路径newapk_savepath：生成的新版本要存放的路径patchpath:差分比文件存放路径
  2. publicnativeintapplyPatchToOldApk(Stringoldapk_filepath,Stringnewapk_savepath,Stringpatchpath);
3、编写Android.mk配置文件，并把需要的bzlib2源代码文件()拷贝到目录下

[html]view plaincopy
  1. LOCAL_PATH:=$(callmy-dir)
  2. include$(CLEAR_VARS)
  4. #Thisisthetargetbeingbuilt.
  5. LOCAL_MODULE:=libBsdiff
  8. #Allofthesourcefilesthatwewillcompile.
  9. #具体到底需要哪些c代码，没有仔细研究过
  10. LOCAL_SRC_FILES:=tu_bingbing_bsdiff_BsdiffBusiness.c\
  11. bzlib.c\
  12. blocksort.c\
  13. compress.c\
  14. crctable.c\
  15. decompress.c\
  16. huffman.c\
  17. randtable.c\
  18. bzip2.c\
  20. #Nostaticlibraries.
  21. LOCAL_STATIC_LIBRARIES:=\
  22. libbz
  25. #AlsoneedtheJNIheaders.
  26. LOCAL_C_INCLUDES+=\
  27. $(JNI_H_INCLUDE)external/bzip2
  29. #Nospecialcompilerflags.
  30. LOCAL_CFLAGS+=
  32. include$(BUILD_SHARED_LIBRARY)
4、实现本地方法

[cpp]view plaincopy
  1. #include<stdio.h>
  2. #include"tu_bingbing_bsdiff_BsdiffBusiness.h"
  4. #include"bzlib_private.h"
  6. #include<stdlib.h>
  7. #include<stdio.h>
  8. #include<string.h>
  9. #include<err.h>
  10. #include<unistd.h>
  11. #include<fcntl.h>
  12. #include<android/log.h>
  15. staticoff_tofftin(u_char*buf)
  16. {
  17. off_ty;
  19. y=buf[7]&0x7F;
  20. y=y*256;y+=buf[6];
  21. y=y*256;y+=buf[5];
  22. y=y*256;y+=buf[4];
  23. y=y*256;y+=buf[3];
  24. y=y*256;y+=buf[2];
  25. y=y*256;y+=buf[1];
  26. y=y*256;y+=buf[0];
  28. if(buf[7]&0x80)y=-y;
  30. returny;
  31. }
  33. intapplypatch(intargc,char*argv[])
  34. {
  35. FILE*f,*cpf,*dpf,*epf;
  36. BZFILE*cpfbz2,*dpfbz2,*epfbz2;
  37. intcbz2err,dbz2err,ebz2err;
  38. intfd;
  39. ssize_toldsize,newsize;
  40. ssize_tbzctrllen,bzdatalen;
  41. u_charheader[32],buf[8];
  42. u_char*old,*new;
  43. off_toldpos,newpos;
  44. off_tctrl[3];
  45. off_tlenread;
  46. off_ti;
  48. if(argc!=4)errx(1,"usage:%soldfilenewfilepatchfile\n",argv[0]);
  50. /*Openpatchfile*/
  51. if((f=fopen(argv[3],"r"))==NULL)
  52. err(1,"fopen(%s)",argv[3]);
  54. /*
  55. Fileformat:
  56. 08"BSDIFF40"
  57. 88X
  58. 168Y
  59. 248sizeof(newfile)
  60. 32Xbzip2(controlblock)
  61. 32+XYbzip2(diffblock)
  62. 32+X+Y???bzip2(extrablock)
  63. withcontrolblockasetoftriples(x,y,z)meaning"addxbytes
  64. fromoldfiletoxbytesfromthediffblock;copyybytesfromthe
  65. extrablock;seekforwardsinoldfilebyzbytes".
  66. */
  68. /*Readheader*/
  69. if(fread(header,1,32,f)<32){
  70. if(feof(f))
  71. errx(1,"Corruptpatch\n");
  72. err(1,"fread(%s)",argv[3]);
  73. }
  75. /*Checkforappropriatemagic*/
  76. if(memcmp(header,"BSDIFF40",8)!=0)
  77. errx(1,"Corruptpatch\n");
  79. /*Readlengthsfromheader*/
  80. bzctrllen=offtin(header+8);
  81. bzdatalen=offtin(header+16);
  82. newsize=offtin(header+24);
  83. if((bzctrllen<0)||(bzdatalen<0)||(newsize<0))
  84. errx(1,"Corruptpatch\n");
  86. /*Closepatchfileandre-openitvialibbzip2attherightplaces*/
  87. if(fclose(f))
  88. err(1,"fclose(%s)",argv[3]);
  89. if((cpf=fopen(argv[3],"r"))==NULL)
  90. err(1,"fopen(%s)",argv[3]);
  91. if(fseeko(cpf,32,SEEK_SET))
  92. err(1,"fseeko(%s,%lld)",argv[3],
  93. (longlong)32);
  94. if((cpfbz2=BZ2_bzReadOpen(&cbz2err,cpf,0,0,NULL,0))==NULL)
  95. errx(1,"BZ2_bzReadOpen,bz2err=%d",cbz2err);
  96. if((dpf=fopen(argv[3],"r"))==NULL)
  97. err(1,"fopen(%s)",argv[3]);
  98. if(fseeko(dpf,32+bzctrllen,SEEK_SET))
  99. err(1,"fseeko(%s,%lld)",argv[3],
  100. (longlong)(32+bzctrllen));
  101. if((dpfbz2=BZ2_bzReadOpen(&dbz2err,dpf,0,0,NULL,0))==NULL)
  102. errx(1,"BZ2_bzReadOpen,bz2err=%d",dbz2err);
  103. if((epf=fopen(argv[3],"r"))==NULL)
  104. err(1,"fopen(%s)",argv[3]);
  105. if(fseeko(epf,32+bzctrllen+bzdatalen,SEEK_SET))
  106. err(1,"fseeko(%s,%lld)",argv[3],
  107. (longlong)(32+bzctrllen+bzdatalen));
  108. if((epfbz2=BZ2_bzReadOpen(&ebz2err,epf,0,0,NULL,0))==NULL)
  109. errx(1,"BZ2_bzReadOpen,bz2err=%d",ebz2err);
  111. if(((fd=open(argv[1],O_RDONLY,0))<0)||
  112. ((oldsize=lseek(fd,0,SEEK_END))==-1)||
  113. ((old=malloc(oldsize+1))==NULL)||
  114. (lseek(fd,0,SEEK_SET)!=0)||
  115. (read(fd,old,oldsize)!=oldsize)||
  116. (close(fd)==-1))err(1,"%s",argv[1]);
  117. if((new=malloc(newsize+1))==NULL)err(1,NULL);
  119. oldpos=0;newpos=0;
  120. while(newpos<newsize){
  121. /*Readcontroldata*/
  122. for(i=0;i<=2;i++){
  123. lenread=BZ2_bzRead(&cbz2err,cpfbz2,buf,8);
  124. if((lenread<8)||((cbz2err!=BZ_OK)&&
  125. (cbz2err!=BZ_STREAM_END)))
  126. errx(1,"Corruptpatch\n");
  127. ctrl[i]=offtin(buf);
  128. };
  130. /*Sanity-check*/
  131. if(newpos+ctrl[0]>newsize)
  132. errx(1,"Corruptpatch\n");
  134. /*Readdiffstring*/
  135. lenread=BZ2_bzRead(&dbz2err,dpfbz2,new+newpos,ctrl[0]);
  136. if((lenread<ctrl[0])||
  137. ((dbz2err!=BZ_OK)&&(dbz2err!=BZ_STREAM_END)))
  138. errx(1,"Corruptpatch\n");
  140. /*Addolddatatodiffstring*/
  141. for(i=0;i<ctrl[0];i++)
  142. if((oldpos+i>=0)&&(oldpos+i<oldsize))
  143. new[newpos+i]+=old[oldpos+i];
  145. /*Adjustpointers*/
  146. newpos+=ctrl[0];
  147. oldpos+=ctrl[0];
  149. /*Sanity-check*/
  150. if(newpos+ctrl[1]>newsize)
  151. errx(1,"Corruptpatch\n");
  153. /*Readextrastring*/
  154. lenread=BZ2_bzRead(&ebz2err,epfbz2,new+newpos,ctrl[1]);
  155. if((lenread<ctrl[1])||
  156. ((ebz2err!=BZ_OK)&&(ebz2err!=BZ_STREAM_END)))
  157. errx(1,"Corruptpatch\n");
  159. /*Adjustpointers*/
  160. newpos+=ctrl[1];
  161. oldpos+=ctrl[2];
  162. };
  164. /*Cleanupthebzip2reads*/
  165. BZ2_bzReadClose(&cbz2err,cpfbz2);
  166. BZ2_bzReadClose(&dbz2err,dpfbz2);
  167. BZ2_bzReadClose(&ebz2err,epfbz2);
  168. if(fclose(cpf)||fclose(dpf)||fclose(epf))
  169. err(1,"fclose(%s)",argv[3]);
  171. /*Writethenewfile*/
  172. if(((fd=open(argv[2],O_CREAT|O_TRUNC|O_WRONLY,0666))<0)||
  173. (write(fd,new,newsize)!=newsize)||(close(fd)==-1))
  174. err(1,"%s",argv[2]);
  176. free(new);
  177. free(old);
  179. return0;
  180. }
  182. //old升级之前apk包路径
  183. //new升级之后apk包路径
  184. //patch文件，可以用bsdiff工具生成
  185. //具体原理可以参看http://blog.csdn.net/hmg25/article/details/8100896
  186. JNIEXPORTjintJNICALLJava_tu_bingbing_bsdiff_BsdiffBusiness_applyPatchToOldApk(JNIEnv*env,
  187. jobjectobj,jstringold,jstringnew,jstringpatch){
  188. intargc=4;
  189. char*argv[argc];
  190. argv[0]="bspatch";
  191. argv[1]=(char*)((*env)->GetStringUTFChars(env,old,0));
  192. argv[2]=(char*)((*env)->GetStringUTFChars(env,new,0));
  193. argv[3]=(char*)((*env)->GetStringUTFChars(env,patch,0));
  195. intret=applypatch(argc,argv);
  197. (*env)->ReleaseStringUTFChars(env,old,argv[1]);
  198. (*env)->ReleaseStringUTFChars(env,new,argv[2]);
  199. (*env)->ReleaseStringUTFChars(env,patch,argv[3]);
  200. returnret;
  201. }

最后 ndk编译，在Android中调用native方法，你会发现在你传入路径下生成了新版本的apk。


DEMO：http://download.csdn.net/detail/tibib/5581905


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