FAQ-0856 Why do Symbian OS 6.1 / 7.0 / Nokia 7650 / Nokia 3650 resource files appear to be different?


FAQ-0856 Why do Symbian OS 6.1 / 7.0 / Nokia 7650 / Nokia 3650 resource files appear to be different?

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Classification:	C++	Category:	Utilities & Build Tools
Created:	03/13/2003	Modified:	03/17/2003
Number:	FAQ-0856
Platform:	Symbian OS v6.1, Symbian OS v7.0

Question:
If I examine the binary format of a compiled resource file from a Symbian 6.1 SDK, it differs considerably between that produced by Symbian 7.0 (such as the P800 SDK) and Symbian OS 6.1- based phone such as the 7650 and 3650. Why is this?

Answer:
Symbian OS 7.0 introduced a resource file compression algorithm which was not present in Symbian OS 6.1:

http://www.symbian.com/developer/techlib/v70docs/SDL_v7.0/doc_source/ToolsAndUtilities/DevTools-ref/CompiledFormat/Compressed-Unicode.html#e%2eCompressed%2dUnicode

However, the Nokia 3650 and 7650 also implement a resource file compression scheme which differs from that in Symbian OS 7.0. Generic Symbian OS 6.1 does not include resource file compression.