Hi,
I have questions on the {ERASE,WRITE,UPDATE} BINARY commands for which I do
not find the answer in the spec (ISO-7816-4).
Here they are:
* What's the exact difference between WRITE BINARY & UPDATE BINARY?
My understanding of the spec is that WRITE BINARY can extend a file's size,
while UPDATE BINARY can only update data elements that are already within
the file (i.e. in the range [0 .. file_size-1]).
Is my understanding correct or did I misunderstand the specscompletely?
* Is it to be considered an error if UPDATE BINARY
a) uses an idx >= existing_file_size ?
b) wants to update 0 data elements (i.e. count = 0) ?
c) idx + count >= existing_file_size?
* Similar for ERASE BINARY
a) Can it set data elements to logical erased state beyond the file size?
i.e. idx + count >= existing_file_size
b) Is it an error to erase 0 data alements
i.e. count = 0
c) If idx + count >= file_size, does the file get zapped (=shortened)
to idx data elements?
Thanks in advance
Peter
--
Peter Marschall
[email protected]
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