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the current code writes part 1 first, and part 0 next,
on the disk, due to the way the swap works.
with this change, swap still swaps the two parts of the file,
on disk, but writes the new file sequentially.
this change might speed up i/o on the file system, on HDDs.
on SSDs, this change likely makes no difference at all.
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don't use malloc(). instead, just load random bytes
into a uint64_t
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this will make the code more flexible, if (when) i
add changes that allow multiple commands to be used
in a single run, on any given number of files
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only read the required number of bytes, per command
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On many Lenovo GbE regions (in factory firmware), part 0 is
invalid but part 1 is valid.
This change means part 1 is checked first. If part 1 is valid,
part 0 won't be checked at all (due to how most C compilers
optimise).
Most people are just going to extract the factory GbE file,
modify it and re-insert it into the ROM image, so this causes
a nice speedup.
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don't constantly open/close the file: /dev/urandom
only read 12 bytes at a time
because of this change, the readFromFile() function now only
handles gbe files
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Massive reduction in number of bytes written, if copy/swap
commands are not used.
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Old behaviour: always write both gbe sections.
New behaviour: only write back what was changed.
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i didn't like the previous commits, they felt really hacky
running malloc and then changing the pointer directly just rubs
me the wrong way
fix that
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don't do xor swap. we know gbe2 is always 4KB higher than
gbe in memory, so we can just set gbe2 to the value of gbe,
and OR the size in bytes of 4KB into gbe2
this is only a marginal speed boost, negligible even, but it's
done for the lulz
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similar to the last change by concept. we now write
individual 4KB blocks per part 0 and 1, at the end
of nvmutil, based on pointer values gbe and gbe2
instead of running memcpy, simply overwrite the pointer
this results in less I/O, thus more speed
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instead of XOR-swapping every byte, have pointers to the
two parts and *XOR swap the pointers*. at the end of the
program execution, when writing, pwrite the two parts into
the same file
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Without this change, arbitrary MAC addresses will always be masked.
This change restores the intended behaviour.
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*This condition will probably never be met, but it is theoretically
possible that the code could still fail at this point. Catch all errors,
and exit, ruthlessly.
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Another oversight in my error handling.
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The code was only checking whether all of the bytes were read,
but there are other errors that can be caught via errno.
Enforce strict errno handling, when generating random
numbers for command `setmac`.
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previously, it was always initialised, but now it's only
initialised if '?' is used on a mac address character in
command `setmac`
this is done by simply moving mac address character
randomisation to a separate function
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I will be using this function elsewhere, and in general
I want this to be usable for lots of programs.
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the error would have never been triggered, because it never
went over 11, but if this code were to be copied elsewhere,
it would be problematic
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If one of the checksums was valid, but the other was not,
errno would be set to E_CANCELED, but then the buffer would
be modified anyway; this is acceptable behaviour, and errno
would later be reset writing the GBE file, which is done
only on the condition that the buffer was modified, but
it's also a good idea to reset it here just in case.
This is not a bugfix, and no behavioural changes will be
observed by the user, but this may *prevent* a bug in the
future, so let's pre-fix that bug now.
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