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scripts/glibcelf.py: Add hashing support

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ELF and GNU hashes can now be computed using the elf_hash and
gnu_hash functions.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Florian Weimer
2022-08-19 11:16:32 +02:00
parent af6b1cce98
commit bd13cb19f5
2 changed files with 38 additions and 0 deletions
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19
scripts/glibcelf.py
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@ -1158,5 +1158,24 @@ class Image:
self._stringtab[sh_link] = strtab
return strtab
def elf_hash(s):
"""Computes the ELF hash of the string."""
acc = 0
for ch in s:
if type(ch) is not int:
ch = ord(ch)
acc = ((acc << 4) + ch) & 0xffffffff
top = acc & 0xf0000000
acc = (acc ^ (top >> 24)) & ~top
return acc
def gnu_hash(s):
"""Computes the GNU hash of the string."""
h = 5381
for ch in s:
if type(ch) is not int:
ch = ord(ch)
h = (h * 33 + ch) & 0xffffffff
return h
__all__ = [name for name in dir() if name[0].isupper()]