PAX擴展焦點標題的問題

我對擴展PAX焦點標題標準有一些問題。PAX擴展焦點標題的問題

我寫了一個程序，它逐頭讀取一個文件並打印一些信息，並在過程中輸入ustar校驗和。當我將PAX Tar送入我的程序時，輸出如下。它是用Java編寫的。

run: 
Reading at 0 
Verifying header checksum... 
Checksum valid. 
Found: .PKGINFO 
Header is PAX: false 
File size: 1055 
Next header offset: 2048 
-------------------------------------- 
Reading at 2048 
Verifying header checksum... 
Checksum valid. 
Found: .BUILDINFO 
Header is PAX: false 
File size: 8419 
Next header offset: 11264 
-------------------------------------- 
Reading at 11264 
Verifying header checksum... 
Checksum valid. 
Found: .INSTALL 
Header is PAX: false 
File size: 175 
Next header offset: 12288 
-------------------------------------- 
Reading at 12288 
Verifying header checksum... 
Checksum valid. 
Found: .MTREE 
Header is PAX: false 
File size: 4025 
Next header offset: 16896 
-------------------------------------- 
Reading at 16896 
Verifying header checksum... 
Checksum valid. 
Found: usr/ 
Header is PAX: false 
File size: 0 
Next header offset: 17408 
-------------------------------------- 
Reading at 17408 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/ 
Header is PAX: false 
File size: 0 
Next header offset: 17920 
-------------------------------------- 
Reading at 17920 
Verifying header checksum... 
Checksum valid. 
Found: usr/bin/ 
Header is PAX: false 
File size: 0 
Next header offset: 18432 
-------------------------------------- 
Reading at 18432 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/ 
Header is PAX: false 
File size: 0 
Next header offset: 18944 
-------------------------------------- 
Reading at 18944 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/ 
Header is PAX: false 
File size: 0 
Next header offset: 19456 
-------------------------------------- 
Reading at 19456 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/applications/ 
Header is PAX: false 
File size: 0 
Next header offset: 19968 
-------------------------------------- 
Reading at 19968 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/applications/firefox.desktop 
Header is PAX: false 
File size: 13148 
Next header offset: 33792 
-------------------------------------- 
Reading at 33792 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/hicolor/ 
Header is PAX: false 
File size: 0 
Next header offset: 34304 
-------------------------------------- 
Reading at 34304 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/hicolor/16x16/ 
Header is PAX: false 
File size: 0 
Next header offset: 34816 
-------------------------------------- 
Reading at 34816 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/hicolor/22x22/ 
Header is PAX: false 
File size: 0 
Next header offset: 35328 
-------------------------------------- 
Reading at 35328 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/hicolor/24x24/ 
Header is PAX: false 
File size: 0 
Next header offset: 35840 
-------------------------------------- 
Reading at 35840 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/hicolor/32x32/ 
Header is PAX: false 
File size: 0 
Next header offset: 36352 
-------------------------------------- 
Reading at 36352 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/hicolor/48x48/ 
Header is PAX: false 
File size: 0 
Next header offset: 36864 
-------------------------------------- 
Reading at 36864 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/hicolor/256x256/ 
Header is PAX: false 
File size: 0 
Next header offset: 37376 
-------------------------------------- 
Reading at 37376 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/hicolor/64x64/ 
Header is PAX: false 
File size: 0 
Next header offset: 37888 
-------------------------------------- 
Reading at 37888 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/hicolor/128x128/ 
Header is PAX: false 
File size: 0 
Next header offset: 38400 
-------------------------------------- 
Reading at 38400 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/hicolor/192x192/ 
Header is PAX: false 
File size: 0 
Next header offset: 38912 
-------------------------------------- 
Reading at 38912 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/hicolor/384x384/ 
Header is PAX: false 
File size: 0 
Next header offset: 39424 
-------------------------------------- 
Reading at 39424 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/hicolor/symbolic/ 
Header is PAX: false 
File size: 0 
Next header offset: 39936 
-------------------------------------- 
Reading at 39936 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/hicolor/symbolic/apps/ 
Header is PAX: false 
File size: 0 
Next header offset: 40448 
-------------------------------------- 
Reading at 40448 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/hicolor/symbolic/apps/PaxHeader/firefox-symbolic.svg 
Header is PAX: true 
File size: 118 
Next header offset: 41472 
-------------------------------------- 
Reading at 41472 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/hicolor/symbolic/apps/firefox-symbolic.svg 
Header is PAX: false 
File size: 6935 
Next header offset: 49152 
-------------------------------------- 
Reading at 49152 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/hicolor/384x384/apps/ 
Header is PAX: false 
File size: 0 
Next header offset: 49664 
-------------------------------------- 
Reading at 49664 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/hicolor/384x384/apps/PaxHeader/firefox.png 
Header is PAX: true 
File size: 118 
Next header offset: 50688 
-------------------------------------- 
Reading at 50688 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/hicolor/384x384/apps/firefox.png 
Header is PAX: false 
File size: 78972 
Next header offset: 130560 
-------------------------------------- 
Reading at 130560 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/hicolor/192x192/apps/ 
Header is PAX: false 
File size: 0 
Next header offset: 131072 
-------------------------------------- 
Reading at 131072 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/hicolor/192x192/apps/PaxHeader/firefox.png 
Header is PAX: true 
File size: 118 
Next header offset: 132096 
-------------------------------------- 
Reading at 132096 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/hicolor/192x192/apps/firefox.png 
Header is PAX: false 
File size: 30788 
Next header offset: 163840 
-------------------------------------- 
Reading at 163840 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/hicolor/128x128/apps/ 
Header is PAX: false 
File size: 0 
Next header offset: 164352 
-------------------------------------- 
Reading at 164352 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/hicolor/128x128/apps/PaxHeader/firefox.png 
Header is PAX: true 
File size: 118 
Next header offset: 165376 
-------------------------------------- 
Reading at 165376 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/hicolor/128x128/apps/firefox.png 
Header is PAX: false 
File size: 17225 
Next header offset: 183296 
-------------------------------------- 
Reading at 183296 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/hicolor/64x64/apps/ 
Header is PAX: false 
File size: 0 
Next header offset: 183808 
-------------------------------------- 
Reading at 183808 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/hicolor/64x64/apps/PaxHeader/firefox.png 
Header is PAX: true 
File size: 118 
Next header offset: 184832 
-------------------------------------- 
Reading at 184832 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/hicolor/64x64/apps/firefox.png 
Header is PAX: false 
File size: 6081 
Next header offset: 191488 
-------------------------------------- 
Reading at 191488 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/hicolor/256x256/apps/ 
Header is PAX: false 
File size: 0 
Next header offset: 192000 
-------------------------------------- 
Reading at 192000 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/hicolor/256x256/apps/PaxHeader/firefox.png 
Header is PAX: true 
File size: 118 
Next header offset: 193024 
-------------------------------------- 
Reading at 193024 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/hicolor/256x256/apps/firefox.png 
Header is PAX: false 
File size: 44148 
Next header offset: 238080 
-------------------------------------- 
Reading at 238080 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/hicolor/48x48/apps/ 
Header is PAX: false 
File size: 0 
Next header offset: 238592 
-------------------------------------- 
Reading at 238592 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/hicolor/48x48/apps/PaxHeader/firefox.png 
Header is PAX: true 
File size: 118 
Next header offset: 239616 
-------------------------------------- 
Reading at 239616 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/hicolor/48x48/apps/firefox.png 
Header is PAX: false 
File size: 4096 
Next header offset: 244736 
-------------------------------------- 
Reading at 244736 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/hicolor/32x32/apps/firefox.png 
Header is PAX: false 
File size: 2472 
Next header offset: 247808 
-------------------------------------- 
Reading at 247808 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/hicolor/24x24/apps/ 
Header is PAX: false 
File size: 0 
Next header offset: 248320 
-------------------------------------- 
Reading at 248320 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/hicolor/24x24/apps/firefox.png 
Header is PAX: false 
File size: 1327 
Next header offset: 250368 
-------------------------------------- 
Reading at 250368 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/hicolor/22x22/apps/ 
Header is PAX: false 
File size: 0 
Next header offset: 250880 
-------------------------------------- 
Reading at 250880 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/hicolor/22x22/apps/firefox.png 
Header is PAX: false 
File size: 1319 
Next header offset: 252928 
-------------------------------------- 
Reading at 252928 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/hicolor/16x16/apps/ 
Header is PAX: false 
File size: 0 
Next header offset: 253440 
-------------------------------------- 
Reading at 253440 
Verifying header checksum... 
Checksum valid. 
Found: usr/share/icons/hicolor/16x16/apps/firefox.png 
Header is PAX: false 
File size: 829 
Next header offset: 254976 
-------------------------------------- 
Reading at 254976 
Verifying header checksum... 
Checksum valid. 
Found: usr/bin/firefox 
Header is PAX: false 
File size: 0 
Next header offset: 255488 
-------------------------------------- 
Reading at 255488 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/ 
Header is PAX: false 
File size: 0 
Next header offset: 256000 
-------------------------------------- 
Reading at 256000 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/gtk2/ 
Header is PAX: false 
File size: 0 
Next header offset: 256512 
-------------------------------------- 
Reading at 256512 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/browser/ 
Header is PAX: false 
File size: 0 
Next header offset: 257024 
-------------------------------------- 
Reading at 257024 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/defaults/ 
Header is PAX: false 
File size: 0 
Next header offset: 257536 
-------------------------------------- 
Reading at 257536 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/webapprt/ 
Header is PAX: false 
File size: 0 
Next header offset: 258048 
-------------------------------------- 
Reading at 258048 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/gmp-clearkey/ 
Header is PAX: false 
File size: 0 
Next header offset: 258560 
-------------------------------------- 
Reading at 258560 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/PaxHeader/omni.ja 
Header is PAX: true 
File size: 87 
Next header offset: 259584 
-------------------------------------- 
Reading at 259584 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/omni.ja 
Header is PAX: false 
File size: 9588234 
Next header offset: 9848832 
-------------------------------------- 
Reading at 9848832 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/dependentlibs.list 
Header is PAX: false 
File size: 38 
Next header offset: 9849856 
-------------------------------------- 
Reading at 9849856 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/application.ini 
Header is PAX: false 
File size: 419 
Next header offset: 9850880 
-------------------------------------- 
Reading at 9850880 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/platform.ini 
Header is PAX: false 
File size: 48 
Next header offset: 9851904 
-------------------------------------- 
Reading at 9851904 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/run-mozilla.sh 
Header is PAX: false 
File size: 8915 
Next header offset: 9861632 
-------------------------------------- 
Reading at 9861632 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/removed-files 
Header is PAX: false 
File size: 707 
Next header offset: 9863168 
-------------------------------------- 
Reading at 9863168 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/dictionaries 
Header is PAX: false 
File size: 0 
Next header offset: 9863680 
-------------------------------------- 
Reading at 9863680 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/hyphenation 
Header is PAX: false 
File size: 0 
Next header offset: 9864192 
-------------------------------------- 
Reading at 9864192 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/firefox-bin 
Header is PAX: false 
File size: 0 
Next header offset: 9864704 
-------------------------------------- 
Reading at 9864704 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/PaxHeader/libxul.so 
Header is PAX: true 
File size: 116 
Next header offset: 9865728 
-------------------------------------- 
Reading at 9865728 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/libxul.so 
Header is PAX: false 
File size: 71366624 
Next header offset: 81232896 
-------------------------------------- 
Reading at 81232896 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/plugin-container 
Header is PAX: false 
File size: 454592 
Next header offset: 81688064 
-------------------------------------- 
Reading at 81688064 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/libmozgtk.so 
Header is PAX: false 
File size: 6000 
Next header offset: 81694720 
-------------------------------------- 
Reading at 81694720 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/firefox 
Header is PAX: false 
File size: 154800 
Next header offset: 81850368 
-------------------------------------- 
Reading at 81850368 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/liblgpllibs.so 
Header is PAX: false 
File size: 60272 
Next header offset: 81911296 
-------------------------------------- 
Reading at 81911296 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/webapprt-stub 
Header is PAX: false 
File size: 191792 
Next header offset: 82103808 
-------------------------------------- 
Reading at 82103808 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/gmp-clearkey/0.1/ 
Header is PAX: false 
File size: 0 
Next header offset: 82104320 
-------------------------------------- 
Reading at 82104320 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/gmp-clearkey/0.1/clearkey.info 
Header is PAX: false 
File size: 116 
Next header offset: 82105344 
-------------------------------------- 
Reading at 82105344 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/gmp-clearkey/0.1/libclearkey.so 
Header is PAX: false 
File size: 117480 
Next header offset: 82223616 
-------------------------------------- 
Reading at 82223616 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/webapprt/webapprt.ini 
Header is PAX: false 
File size: 485 
Next header offset: 82224640 
-------------------------------------- 
Reading at 82224640 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/webapprt/omni.ja 
Header is PAX: false 
File size: 75149 
Next header offset: 82300416 
-------------------------------------- 
Reading at 82300416 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/defaults/pref/ 
Header is PAX: false 
File size: 0 
Next header offset: 82300928 
-------------------------------------- 
Reading at 82300928 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/defaults/pref/channel-prefs.js 
Header is PAX: false 
File size: 245 
Next header offset: 82301952 
-------------------------------------- 
Reading at 82301952 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/browser/icons/ 
Header is PAX: false 
File size: 0 
Next header offset: 82302464 
-------------------------------------- 
Reading at 82302464 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/browser/chrome/ 
Header is PAX: false 
File size: 0 
Next header offset: 82302976 
-------------------------------------- 
Reading at 82302976 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/browser/features/ 
Header is PAX: false 
File size: 0 
Next header offset: 82303488 
-------------------------------------- 
Reading at 82303488 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/browser/components/ 
Header is PAX: false 
File size: 0 
Next header offset: 82304000 
-------------------------------------- 
Reading at 82304000 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/browser/extensions/ 
Header is PAX: false 
File size: 0 
Next header offset: 82304512 
-------------------------------------- 
Reading at 82304512 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/browser/chrome.manifest 
Header is PAX: false 
File size: 40 
Next header offset: 82305536 
-------------------------------------- 
Reading at 82305536 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/browser/PaxHeader/omni.ja 
Header is PAX: true 
File size: 88 
Next header offset: 82306560 
-------------------------------------- 
Reading at 82306560 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/browser/omni.ja 
Header is PAX: false 
File size: 12326304 
Next header offset: 94633472 
-------------------------------------- 
Reading at 94633472 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/browser/blocklist.xml 
Header is PAX: false 
File size: 215251 
Next header offset: 94849536 
-------------------------------------- 
Reading at 94849536 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/browser/defaults/ 
Header is PAX: false 
File size: 0 
Next header offset: 94850048 
-------------------------------------- 
Reading at 94850048 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/browser/defaults/preferences/ 
Header is PAX: false 
File size: 0 
Next header offset: 94850560 
-------------------------------------- 
Reading at 94850560 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/browser/defaults/preferences/vendor.js 
Header is PAX: false 
File size: 328 
Next header offset: 94851584 
-------------------------------------- 
Reading at 94851584 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/browser/extensions/{972ce4c6-7e08-4474-a285-3208198ce6fd}.xpi 
Header is PAX: false 
File size: 3375 
Next header offset: 94855680 
-------------------------------------- 
Reading at 94855680 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/browser/components/components.manifest 
Header is PAX: false 
File size: 36 
Next header offset: 94856704 
-------------------------------------- 
Reading at 94856704 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/browser/components/libbrowsercomps.so 
Header is PAX: false 
File size: 60064 
Next header offset: 94917632 
-------------------------------------- 
Reading at 94917632 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/browser/features/PaxHeader/[email protected] 
Header is PAX: true 
File size: 88 
Next header offset: 94918656 
-------------------------------------- 
Reading at 94918656 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/browser/features/[email protected] 
Header is PAX: false 
File size: 1582541 
Next header offset: 96501760 
-------------------------------------- 
Reading at 96501760 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/browser/chrome/icons/ 
Header is PAX: false 
File size: 0 
Next header offset: 96502272 
-------------------------------------- 
Reading at 96502272 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/browser/chrome/icons/default/ 
Header is PAX: false 
File size: 0 
Next header offset: 96502784 
-------------------------------------- 
Reading at 96502784 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/browser/chrome/icons/default/default16.png 
Header is PAX: false 
File size: 829 
Next header offset: 96504320 
-------------------------------------- 
Reading at 96504320 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/browser/chrome/icons/default/default32.png 
Header is PAX: false 
File size: 2472 
Next header offset: 96507392 
-------------------------------------- 
Reading at 96507392 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/browser/chrome/icons/default/PaxHeader/default48.png 
Header is PAX: true 
File size: 88 
Next header offset: 96508416 
-------------------------------------- 
Reading at 96508416 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/browser/chrome/icons/default/default48.png 
Header is PAX: false 
File size: 4096 
Next header offset: 96513536 
-------------------------------------- 
Reading at 96513536 
Verifying header checksum... 
An tar error occured: Invalid Tar header checksum! 
BUILD SUCCESSFUL (total time: 0 seconds)

在字節96513536我遇到這種：

經過一番研究，我發現，這是pax擴展頭。問題是這個標題在彈出之前沒有在任何地方通告過。

我該如何預測這個頭文件並按照它來處理？

這是我的程序有效傳遞的輸出。

run: 
Reading at 0 
Verifying header checksum... 
Checksum valid. 
Found: Test1/ 
Header is PAX: false 
File size: 0 
Next header offset: 512 
-------------------------------------- 
Reading at 512 
Verifying header checksum... 
Checksum valid. 
Found: Test1/test_1 
Header is PAX: false 
File size: 0 
Next header offset: 1024 
-------------------------------------- 
Reading at 1024 
Verifying header checksum... 
Checksum valid. 
Found: Test2/ 
Header is PAX: false 
File size: 0 
Next header offset: 1536 
-------------------------------------- 
Reading at 1536 
Verifying header checksum... 
Checksum valid. 
Found: Test2/Test_2 
Header is PAX: false 
File size: 0 
Next header offset: 2048 
-------------------------------------- 
Reading at 2048 
Verifying header checksum... 
Checksum valid. 
Found: test_3 
Header is PAX: false 
File size: 0 
Next header offset: 2560 
-------------------------------------- 
Reading at 2560 
Verifying header checksum... 
Invalid checksum, Tar EOF found. 

Finnished reading, read 5 files and folders. 
This took 15ms 
BUILD SUCCESSFUL (total time: 0 seconds)

我該如何預測一個PAX標題。 PAX如何工作？什麼是PaxHeader文件夾？

來源

2016-04-27 Gala

這個問題是在我的計算下一個標題的邏輯。

Reading at 96508416 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/browser/chrome/icons/default/default48.png 
Header is PAX: false 
File size: 4096 
Next header offset: 96513536 
-------------------------------------- 
Reading at 96513536 
Verifying header checksum... 
An tar error occured: Invalid Tar header checksum! 
BUILD SUCCESSFUL (total time: 0 seconds)

文件大小爲4096字節。這裏的問題是，我的代碼看起來淵源是這樣的：

private void setOffsetToNextHeader(int size) { 
     if (size == 0) { 
      offset += 512; 
     } else { 
      offset += (((size + 512)/512) + 1) * 512; 
     } 
    }

這樣，偏移設置512個字節太大，因爲算法通過512

依靠四捨五入後師整數下來如果沒有發生rouning，結果乘以一個時間512

太多更改上面的代碼如下：

private void setOffsetToNextHeader(int size) { 
     if (size == 0) { 
      offset += 512; 
     } else if ((size % 512) == 0) { 
      offset += size + 512; 
     } else { 
      offset += (((size + 512)/512) + 1) * 512; 
     } 
    }

解決了我ssue。

這是該計劃的有效輸出，我期待：

-------------------------------------- 
Reading at 96508416 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/browser/chrome/icons/default/default48.png 
PAX Header prefix: false 
File size: 4096 
Next header offset: 96513024 
Extracting... 
-------------------------------------- 
Reading at 96513024 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/browser/icons/PaxHeader/mozicon128.png 
PAX Header prefix: true 
File size: 88 
Next header offset: 96514048 
Extracting... 
-------------------------------------- 
Reading at 96514048 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/browser/icons/mozicon128.png 
PAX Header prefix: false 
File size: 17225 
Next header offset: 96531968 
Extracting... 
-------------------------------------- 
Reading at 96531968 
Verifying header checksum... 
Checksum valid. 
Found: usr/lib/firefox/gtk2/libmozgtk.so 
PAX Header prefix: false 
File size: 10096 
Next header offset: 96542720 
Extracting... 
-------------------------------------- 
Reading at 96542720 
Verifying header checksum... 
Tar EOF found. 

Finnished reading, read 109 files and folders. 
This took 94ms 
BUILD SUCCESSFUL (total time: 0 seconds)

來源

2016-04-27 18:59:30 Gala

PAX擴展焦點標題的問題

回答

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