今年的Google IO 有一個talk在講Java Puzzlers
http://www.google.com/events/io/2011/sessions/java-puzzlers-scraping-the-bottom-of-the-barrel.html
比較舊的Talk在這
http://video.google.com/videoplay?docid=9214177555401838409#
書的link
http://www.javapuzzlers.com/
Monday, May 30, 2011
Thursday, May 26, 2011
Wednesday, May 25, 2011
android ndkr5 -no-pic
在ndk groups這篇
http://goo.gl/zOwpr
討論到了在ndkr5的時候
This does not affect anyone using the NDK build system, only people who
want to use the toolchain in standalone mode.
default是給 -fpic 所以造成了10%~25%的performance loss
而且在講解原因的時候又是很經典的句子
The reason for this is historical, and the C compiler
team has agreed that using -fpic by default for this config makes sense.
而最後在cflags加了-fno-pic後也真的提高了performance
http://goo.gl/zOwpr
討論到了在ndkr5的時候
This does not affect anyone using the NDK build system, only people who
want to use the toolchain in standalone mode.
default是給 -fpic 所以造成了10%~25%的performance loss
而且在講解原因的時候又是很經典的句子
The reason for this is historical, and the C compiler
team has agreed that using -fpic by default for this config makes sense.
而最後在cflags加了-fno-pic後也真的提高了performance
Tuesday, May 24, 2011
javascript的delete
http://perfectionkills.com/understanding-delete/
在這篇文章很清楚的提到了javascript裡 delete operator的功用
在這篇文章很清楚的提到了javascript裡 delete operator的功用
c++的mutable
在看c++的時候
一直在想 mutable主要的用處 use-case 是什麼
這篇就講到了
http://stackoverflow.com/questions/105014/c-mutable-keyword
一直在想 mutable主要的用處 use-case 是什麼
這篇就講到了
http://stackoverflow.com/questions/105014/c-mutable-keyword
Wednesday, May 18, 2011
gamecih2
之前看到CIH在Android Market 上放了gamecih2
雖然沒去當天的H4
不過有看到當天留下的討論
http://hackingthursday.wikidot.com/2011-05-05
雖然沒去當天的H4
不過有看到當天留下的討論
http://hackingthursday.wikidot.com/2011-05-05
CIH 做了 GameCIH & GameCIH2 可以在玩游戲時鎖血量或是改金錢之類的 game master。可以在 Android Market 上下載,需要 root 才能正確執行。
基本原理 - Android App root 後,用 binary serach 去翻查 dalvik vm memory mapping. (只能說耐心超級高!) > 討論爭執主要是 key event , library call 跟 introspection/reflection 攔截是不是有更好的做法。以及 anti-ptrace 的可能性。主張 hprofile/ptrace/jvm debugging api 應該比硬幹攔 keycode, 攔 soft key 的screen/button event 乾淨。
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