Enhanced hook function for use with different versions of a dynamically loaded library

1. A method, comprising operations of:

identifying, during execution of a software application, a first reference to a function in the software application, wherein the first reference corresponds to a first version of a dynamically loaded library (DLL) with a first version of the function;

dynamically generating a first hook-entry code configured to uniquely identify the first version of the function, wherein a first return address corresponding to the first version of the function is used to generate the first hook-entry code; and

replacing the first reference with the first hook-entry code.

2. The method of claim 1 , wherein an enhanced hook calls the first version of the function upon receiving the first hook-entry code.

3. The method of claim 1 , further comprising:

identifying, during execution of the software application, a second reference to the function in the software application, wherein the second reference corresponds to a second version of the DLL with a second version of the function; and

dynamically generating a second hook-entry code configured to uniquely identify the second version of the function, wherein a second return address corresponding to the second version of the function is used to generate the second hook-entry code.

4. The method of claim 3 , further comprising:

replacing the second reference with the second hook-entry code.

5. The method of claim 4 , wherein the enhanced hook calls the first version of the function, upon receiving the first hook-entry code.

6. The method of claim 1 , wherein the software application is compressed together with a virtual operating system in an executable file.

7. The method of claim 6 , wherein code for generating the first hook-entry code is part of the virtual operating system.

8. One or more non-transitory computer-readable media persistently storing a program, wherein the program, when executed, instructs a processor to perform the following operations:

identify, during execution of a software application, a first reference to a function in the software application, wherein the first reference corresponds to a first version of a dynamically loaded library (DLL) with a first version of the function;

dynamically generate a first hook-entry code configured to uniquely identify the first version of the function, wherein a first return address corresponding to the first version of the function is used to generate the first hook-entry code; and

replace the first reference with the first hook-entry code.

9. The non-transitory computer-readable media of claim 8 , wherein an enhanced hook calls the first version of the function, upon receiving the first hook-entry code.

10. The non-transitory computer-readable media of claim 8 , further comprising:

identify, during execution of the software application, a second reference to the function in the software application, wherein the second reference corresponds to a second version of the DLL with a second version of the function; and

dynamically generate a second hook-entry code configured to uniquely identify the second version of the function, wherein a second return address corresponding to the second version of the function is used to generate the second hook-entry code.

11. The non-transitory computer-readable media of claim 10 , further comprising:

replacing the second reference with the second hook-entry code.

12. The non-transitory computer-readable media of claim 11 , wherein the enhanced hook calls the first version of the function, upon receiving the first hook-entry code.

13. The non-transitory computer-readable media of claim 8 , wherein the software application is compressed together with a virtual operating system in an executable file.

14. The non-transitory computer-readable media of claim 13 , wherein code for generating the first hook-entry code is part of the virtual operating system.

15. A method, comprising:

beginning execution of a software application, wherein the software application is compressed together with a virtual operating system in an executable file;

identifying, during execution of the software application, a first reference to a function in the software application, wherein the first reference corresponds to a first version of a dynamically loaded library (DLL) with a first version of the function;

dynamically generating a first hook-entry code configured to uniquely identify the first version of the function, wherein a first return address corresponding to the first version of the function is used to generate the first hook-entry code; and

replacing the first reference with the first hook-entry code.

16. The method of claim 15 , wherein the software application includes an enhanced hook configured to call the first version of the function upon receiving the first hook-entry code.

17. The method of claim 15 , wherein code for generating the first hook-entry code is part of the virtual operating system.

18. The method of claim 15 , further comprising:

identifying, during execution of the software application, a second reference to the function in the software application, wherein the second reference corresponds to a second version of the DLL with a second version of the function; and

dynamically generating a second hook-entry code configured to uniquely identify the second version of the function, wherein a second return address corresponding to the second version of the function is used to generate the second hook-entry code.

19. The method of claim 18 , further comprising replacing the second reference with the second hook-entry code.

20. The method of claim 19 , wherein the enhanced hook calls the first version of the function, upon receiving the first hook-entry code.