MetalMonday/me_cleaner
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Print the image minimum size

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If most of the FTPR modules are removed the image can be truncated
after the last unremovable module.
This commit is contained in:
Nicola Corna 2017-01-24 15:37:40 +01:00
parent 61f85bad19
commit a1df173eab
1 changed files with 19 additions and 2 deletions
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21
me_cleaner.py
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@ -64,6 +64,7 @@ def remove_modules(f, mod_headers, ftpr_offset):
chunks_offsets = []
base = 0
chunk_size = 0
end_addr = 0
for mod_header in mod_headers:
name = mod_header[0x04:0x14].rstrip(b"\x00").decode("ascii")
@ -79,6 +80,7 @@ def remove_modules(f, mod_headers, ftpr_offset):
.format(offset, offset + size))
if name in unremovable_modules:
end_addr = max(end_addr, offset + size)
print("NOT removed, essential")
else:
fill_range(f, offset, offset + size, b"\xff")
@ -132,6 +134,11 @@ def remove_modules(f, mod_headers, ftpr_offset):
if removable_chunk[1] > removable_chunk[0]:
fill_range(f, removable_chunk[0], removable_chunk[1], b"\xff")
end_addr = max(end_addr,
max(unremovable_huff_chunks, key=lambda x: x[1])[1])
return end_addr
def check_partition_signature(f, offset):
f.seek(offset)
@ -359,12 +366,22 @@ else:
for i in range(0, num_modules)]
if all(mod_h.startswith(b"$MME") for mod_h in mod_headers):
remove_modules(f, mod_headers, ftpr_offset)
end_addr = remove_modules(f, mod_headers, ftpr_offset)
new_ftpr_offset += me_start
relocate_partition(f, me_start, me_start + 0x30,
new_ftpr_offset, mod_headers)
ftpr_offset = new_ftpr_offset
end_addr += new_ftpr_offset - ftpr_offset
end_addr = (end_addr // 0x1000 + 1) * 0x1000
print("The ME minimum size is {0} bytes ({0:#x} bytes)"
.format(end_addr - me_start))
if me_start > 0:
print("The ME region can be reduced up to:\n"
" {:08x}:{:08x} me"
.format(me_start, end_addr - 1))
else:
print("Found less modules than expected in the FTPR "
"partition; skipping modules removal")