these take any file size of gbe file: 8KB, 16KB
or 128KB. so does the normal cat.
then you can use cat, cat16 or cat128. these
output to stdout, the corresponding size in KB.
0xFF padding used on the larger files. on the
larger files, the first 4KB of each half is the
GbE parts, and everything else is 0xFF padding.
now you can resize gbe files easily, example:
./nvmutil gbe128.bin > gbe8.bin
yes
Signed-off-by: Leah Rowe <leah@libreboot.org>
it *is* cat. it's catting two GbE parts. so its cat.
(two 4KB areas, plus padding when i add cat16/cat128)
Signed-off-by: Leah Rowe <leah@libreboot.org>
with this, you can read 16KB and 128KB files, and output
them to stdout, but it outputs 8KB
for example:
./nvmutil gbe128.bin > gbe8.bin
now you have a 8KB file
i could probably easily add cat16 and cat128 too.
nvmutil reads two 4KB parts regardless of GbE file
size (one from the first 4KB of each half of the
file), so this was easy to implement.
Signed-off-by: Leah Rowe <leah@libreboot.org>
don't cast unsigned to signed.
no behaviour is changed, but this will prevent some
silly compilers complaining about -Wsign-conversion
Signed-off-by: Leah Rowe <leah@libreboot.org>
i removed this before, but it's good to put it
here defensively, in case i ever mess up
the urandom read function again.
Signed-off-by: Leah Rowe <leah@libreboot.org>
i forgot to handle it in the previous refactor
not really a problem in practise, since the first
read probably succeeds anyway.
Signed-off-by: Leah Rowe <leah@libreboot.org>
also handles possible overflows in read_gbe_file_exact
it removes dead code on both paths: arc4random and
urandom
Signed-off-by: Leah Rowe <leah@libreboot.org>
we rely on uint16_t wrapping, but some platforms may
behave weirdly.
cast as uint32_t and then cast back, on return, with
an explicit mask beforehand.
Signed-off-by: Leah Rowe <leah@libreboot.org>
i plan to release this as a standalone utility at
some point, once it's perfect (on its current
feature set)
Signed-off-by: Leah Rowe <leah@libreboot.org>
i will write a *manpage* at some point. for now, the
documentation on libreboot.org shall suffice.
i'm nearly ready to submit this code to coreboot.
Signed-off-by: Leah Rowe <leah@libreboot.org>
explicitly declare the directory path for the given
file (nvmutil), otherwise it's implementation-defined;
on some systems, /bin/nvmutil means a directory named
nvmutil could then contain nvmutil.
Signed-off-by: Leah Rowe <leah@libreboot.org>
I also needed: #define _POSIX_C_SOURCE 200809L
I use -pedantic with -Wall -Wextra -Werror, which
forces very strict error handling and ISO C; this
means pread and pwrite aren't available.
The define fixes this.
Signed-off-by: Leah Rowe <leah@libreboot.org>
Leah Rowe