You asked how you should begin; the first step is likely to determine what is in each APK and if it is relevant to your goals. Simply extract them all and poke around a bit.
Like Robert's comment says, Android App Bundles are a common format, and serve to modularize the app by shipping only the components needed for a particular device. So in this case, it ...
This is a helper function used by PPC EABI conforming compilers for reducing code size. From ctrsavres.asm:
/* Routines for saving integer registers, called by the compiler. */
/* Called with r11 pointing to the stack header word of the caller of the */
/* function, just beyond the end of the integer save area. */
Because it is called by the compiler, it ...
Regarding unaff_ and in_ prefixes (source):
in or unaff : this typically indicates that a register is read
before it is written (and it does not contain a parameter
passed to the function)
So, if you encounter them in decompilator, it means that their values are used before they are initialised in the function (they contain the values assigned earlier, in ...
The default assignment operator for primitives returns a value, and the standard convention for operator overloading is to not deviate from the behavior of the operator you are overloading. This is why it's good practice to continue to return the assigned reference from the assignment overload operator.
Because of this behavior, there's a well-used idiom in ...
It is rather C++ question, but nonetheless:
what you see is an assignment operator for the class QString. It enables you to write things like a = b, where a, b are of QString type.
The reason why it returns value is to enable you to write: a = b = c instead of a = c and b = c and you may see this pattern in case of other operators overloading (see question ...
IDA’s C parser does not handle some C++ syntax like namespaces. There are two options:
Rename the local type or struct to have no “wrong” symbols, you can use it in type declaration then
Use “Convert to struct*” context menu command on the argument/variable. This bypasses the C parser and sets the type directly.
How does this question differ to your question here?
Your key is Renjx%2$CjM.
You can use the zcu module I have written to decode your configuration file e.g.
$ python3 examples/decode.py config.bin config.xml --key 'Renjx%2$CjM'
$ head config.xml
<Tbl name="DBBase" RowCount="1">
<DM name="IFInfo" val="...