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libfdt: Add fdt_header_size()

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We have a couple of places within libfdt and its tests where we need to
find the size of the header, based on the version.  Add a helper function
for it.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>
This commit is contained in:
David Gibson
2018-03-16 22:40:26 +11:00
parent 6473a21d8b
commit 0112fda03b
3 changed files with 29 additions and 10 deletions
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11
libfdt/libfdt.h
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@@ -244,8 +244,19 @@ fdt_set_hdr_(size_dt_strings);
fdt_set_hdr_(size_dt_struct);
#undef fdt_set_hdr_
/**
* fdt_header_size - return the size of the tree's header
* @fdt: pointer to a flattened device tree
*/
size_t fdt_header_size_(uint32_t version);
static inline size_t fdt_header_size(const void *fdt)
{
return fdt_header_size_(fdt_version(fdt));
}
/**
* fdt_check_header - sanity check a device tree header
* @fdt: pointer to data which might be a flattened device tree
*
* fdt_check_header() checks that the given buffer contains what