Tinker源码分析四

一、UpgradePatch类
tryPatch(Context context, String tempPatchPath, PatchResult patchResult)方法

• PatchFile: /storage/emulated/0/patch_signed_7zip.apk

• PatchDirectory: /data/data/tinker.sample.android/tinker

• PatchVersionDirectory: /data/data/tinker.sample.android/tinker/patch-931e8e6c

• DesPatchFile: /data/data/tinker.sample.android/tinker/patch- 931e8e6c/patch-931e8e6c.apk

• PatchMd5: 931e8e6c07fc199bf33ef872510900a5

• PatchInfoFile: /data/data/tinker.sample.android/tinker/patch.info

• newInfo = new SharePatchInfo("", patchMd5);

getPatchInfoLockFile: /data/data/tinker.sample.android/tinker/info.lock

二、DexDiffPatchInternal类

第一种对应完全新增的dex，第二种对应本来没变化，但是由于其他dex的变化需要打入这个dex里引用了那个变化了的dex的类

• patchRealPath: classes.dex

final String infoPath = info.path;
String patchRealPath;
if(infoPath.equals("")) {
    patchRealPath = info.rawName;} 
else { 
   patchRealPath = info.path + "/" + info.rawName;
}

• directory: /data/data/tinker.sample.android/tinker/patch-931e8e6c/dex

• dir: /data/data/tinker.sample.android/tinker/patch-931e8e6c/dex/

• ApkPath或者Application.sourcedir: /data/app/tinker.sample.android-2/base.apk

• extractedFile：/data/data/tinker.sample.android/tinker/patch- 931e8e6c/dex/smallpatch_info.ddextra

• File extractedFile = new File(dir + info.realName);
/data/data/tinker.sample.android/tinker/patch-931e8e6c/dex/classes.dex.jar

• ZipEntry patchFileEntry = patch.getEntry(patchRealPath); ZipEntry rawApkFileEntry = apk.getEntry(patchRealPath);

• oldDexSize = (int) rawApkFileEntry.getSize(); 原始apk中class.dex的大小

InputStream oldInputStream = apk.getInputStream(rawApkFileEntry); InputStream newInputStream = patch.getInputStream(patchFileEntry);

SmallPatchedDexItemFile : /data/data/tinker.sample.android/tinker/patch-931e8e6c/dex/smallpatch_info.ddextra

• 构造方法,zos是extractedFile

new DexPatchApplier(oldInputStream, oldDexSize, newInputStream,
 smallPatchInfoFile).executeAndSaveTo(zos);

public DexPatchApplier(
        InputStream oldDexIn,
        int initDexSize,
        InputStream patchFileIn,
        SmallPatchedDexItemFile extraInfoFile) throws IOException {
        this(
            new Dex(oldDexIn, initDexSize), 
           (patchFileIn != null ? new DexPatchFile(patchFileIn) : null),
            extraInfoFile
    );
}

this.extraInfoFile = SmallPatchedDexItemFile;

if (extraInfoFile == null || !extraInfoFile.isAffectedOldDex(this.oldDexSignStr)) {
    patchedToc.stringIds.off
            = this.patchFile.getPatchedStringIdSectionOffset();

} else {
    patchedToc.stringIds.off =
 this.extraInfoFile.getPatchedStringIdOffsetByOldDexSign(oldDexSignStr);

小dex如果为空，则使用patchFile来计算位置偏移。

• TableOfContents patchedToc = this.patchedDex.getTableOfContents();
  根据patchedDex来得到，而patchedDex又等于：。

if (extraAddedDexElementsFile == null) { 
   this.patchedDex = new Dex(patchFileIn.getPatchedDexSize());
} else {
    this.patchedDex = new Dex(
            extraAddedDexElementsFile.getPatchedDexSizeByOldDexSign(this.oldDexSignStr) 
   );
}

• 接着，根据区域分块，执行算法合成。

• 最后得到的是extractedFile，对比extractedFileMd5.
  String extractedFileMd5 = ShareTinkerInternals.isVmArt() ? info.destMd5InArt : info.destMd5InDvm;

得到extracted文件之后

• File dexFiles = new File(dir); File[] files = dexFiles.listFiles();

files = {File[2]@4819} 
 0 = {File@4822} "/data/data/tinker.sample.android/tinker/patch-931e8e6c/dex/classes.dex.jar"
 1 = {File@4823} "/data/data/tinker.sample.android/tinker/patch-931e8e6c/dex/test.dex.jar"

• optimizeDexDirectory: /data/data/tinker.sample.android/tinker/patch- 931e8e6c/odex/

• outputPathName : /data/data/tinker.sample.android/tinker/patch- 931e8e6c/odex/classes.dex.dex
file: /data/data/tinker.sample.android/tinker/patch- 931e8e6c/dex/classes.dex.jar

• 最后调用DexFile.loadDex(file.getAbsolutePath(), outputPathName, 0);

三、ShareDexDiffPatchInfo
class.dex

• destMd5InArt = "0b7ac225cab45910bff62ca2851a10ba"
• destMd5InDvm = "68c3b5f96dfe971c0d44398ddffd6a35"
• dexDiffMd5 = "84aab131677430f22b35fc4668f44423"
• dexMode = "jar"
• isJarMode = true
• oldDexCrC = "2996628334"
• path = ""
• rawName = "classes.dex"
• realName = "classes.dex.jar"
• shadow$_klass_ = {Class@4358} "class com.tencent.tinker.loader.shareutil.ShareDexDiffPatchInfo"
• shadow$_monitor_ = -1618719825

还会有一个test.dex:

• destMd5InArt = "56900442eb5b7e1de45449d0685e6e00"
• destMd5InDvm = "56900442eb5b7e1de45449d0685e6e00"
• dexDiffMd5 = "0"
• dexMode = "jar"
• isJarMode = true
• oldDexCrC = "0"
• path = ""
• rawName = "test.dex"
• realName = "test.dex.jar"
• shadow$_klass_ = {Class@4358} "class com.tencent.tinker.loader.shareutil.ShareDexDiffPatchInfo"
• shadow$_monitor_ = -1618719825

当oldDexCrC=0时，完全新增的dex。调用extractDexToJar方法

• extractTo: /data/data/tinker.sample.android/tinker/patch- 931e8e6c/dex/test.dex.jar

• entryFile: test.dexpatch中的它写入extractTo里面。

test.dex是测试插入是否第一次的，有些手机可以插入dex，但不会生效。