please find below link for understanding the entire structure binary xml ans .arsc
http://justanapplication.wordpress.com/android-internals/ My question is don't we have to move the bytes when we replace the string with bigger one, apart from changing the values you mentioned below On Tuesday, June 21, 2011 8:09:12 PM UTC-7, Illyoung Choi wrote: > > Hi All. > > Last day, I made a simple application for parsing an Android Resource > File (*.arsc) and modifying resource strings. > > I think this thing might be a help for someone, so I'll share the > structure of *.arsc that I understood. > > Since I could not spend many hours for this, my understanding is not > perfect and might be slightly wrong. > > > I patched string resource from *.apk. > Simply extracted *.apk with 7zip and got the resources.arsc file. > > Below are the structure of *.arsc > > struct ANDROID_RESOURCE_HEADER > { > int signature; // 0x000c0002, I assume this is a signature > int nImageLength; // total ARSC file size (bytes) > int nUnknown1[2]; // still unknown (not important for modifying > strings) > int nStringBlockLength; // total StringBlock(see below) size > int nStringCount; // total number of String Resources > int nUnknown2[4]; // still unknown (not important for modifying > strings) > } > > "struct ANDROID_RESOURCE_HEADER" is a header of ARSC file image. > So simply you can read this header information from file. > > After this header, you will meet the StringBlock > > StringBlock has 2Sections > { > [String Offset] > [String Data] > } > > String Offset Section has Offset Values of Specific Strings from > StringBlock Start Address. > > String Data Section has 2 Part > > String Data > { > [Length] > [String] > } > > Length part is 2byte. but, in AscII Mode, uses only 1byte. > Before reading String, you must check whether it is "Unicode" or > "AscII" format. > > in Unicode format, Length part will be used with 2bytes. > normally it is "0x??, 0x00" (only if it is not longer than 256 bytes) > > in AscII format, Length part will be used with 1bytes. but, they also > used second byte for mirroring. > if string length has a value 7, you will meet "0x07, 0x07" > > So, I checked whether both bytes have same value to check string > format. > > > Lastly, actual string data will be after this length part with "Zero > Terminal" > in Unicode format, surely, Zero Terminal will be 2 byte of zero. > > > > Whenever you change the string of this ARSC file, you should > recalculate these. > Length Part of String Data > String Offset of StringBlock > nImageLength of Header > nStringBlockLength of Header > > > After doing these all. > Simply, remove all JAR Signature (META-INF folder) from package. > Re-Archive with Zip and rename with *.apk. > Resign with your certificate by using "jarsigner" of JDK > > > > Thanks. -- -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en --- You received this message because you are subscribed to the Google Groups "Android Developers" group. To unsubscribe from this group and stop receiving emails from it, send an email to android-developers+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
