mbirth/gcd-parser
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Spiced up kunix's tool a bit.

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This commit is contained in:
Markus Birth 2020-05-08 17:21:28 +02:00
parent d973ba9475
commit ce673398c9
Signed by: mbirth
GPG Key ID: A9928D7A098C3A9A
1 changed files with 28 additions and 21 deletions
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45
binbase_kunix.py
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@ -12,17 +12,18 @@ import os.path
import sys import sys
FILE = sys.argv[1] FILE = sys.argv[1]
OFFSET = 0
if len(sys.argv) > 2:
OFFSET = int(sys.argv[2])
BLOCKSIZE = 4096 BLOCKSIZE = 4096
END_MARKER = b"\xff\xff\x5a\xa5" END_MARKER = b"\xff\xff\x5a\xa5"
first_block = True first_block = True
past_end = False end_marker_pos = 0xffffffff
trailer = bytes()
trailer_pos = -1
print("Reading {} ...".format(FILE)) print("Reading {} ...".format(FILE))
with open(FILE, "rb") as f: with open(FILE, "rb") as f:
f.read(OFFSET)
while True: while True:
block = f.read(BLOCKSIZE) block = f.read(BLOCKSIZE)
if first_block: if first_block:
@ -30,37 +31,43 @@ with open(FILE, "rb") as f:
first_block = False first_block = False
if END_MARKER in block: if END_MARKER in block:
end_pos = block.find(END_MARKER) end_pos = block.find(END_MARKER)
marker_end = f.tell() - len(block) + end_pos + 2 found_pos = f.tell() - len(block) + end_pos + 2
break if found_pos > end_marker_pos:
print("Found a second endmarker! Using that one.")
end_marker_pos = found_pos
#break
if len(block) < BLOCKSIZE: if len(block) < BLOCKSIZE:
break break
f.close() f.close()
size = os.path.getsize(FILE) size = os.path.getsize(FILE)
print("File is {} Bytes.".format(size)) print("File is {} (0x{:x}) Bytes.".format(size, size))
print("First double-words: 0x{:x} / 0x{:x} / 0x{:x} / 0x{:x} / 0x{:x}".format(dw[0], dw[1], dw[2], dw[3], dw[4])) print("First double-words: 0x{:x} / 0x{:x} / 0x{:x} / 0x{:x} / 0x{:x}".format(dw[0], dw[1], dw[2], dw[3], dw[4]))
print("Found end marker at: 0x{:x}".format(marker_end)) print("Assuming this is end marker location in memory: 0x{:x}".format(dw[1]))
print("Found end marker in file at: 0x{:x}".format(end_marker_pos))
base_addr = dw[1] - marker_end base_addr = dw[1] - (end_marker_pos - OFFSET)
if base_addr < 0:
base_addr += 0xffffffff
print("This would make Base address probably 0x{:x}".format(base_addr))
if base_addr % 4 != 0: if base_addr % 4 != 0:
print("Bad alignment. Calculated base address not aligned to doublewords.") print("However, bad alignment. Calculated base address not aligned to doublewords.")
#sys.exit(1)
if base_addr + size > 0xffffffff: if base_addr + size > 0xffffffff:
print("Overflow") print("However, base address can't fit whole file.")
sys.exit(1)
if dw[2] % 2 != 0 or dw[2] - base_addr >= marker_end - 3: # Assumes second dword points to hwid
print("Align & Bounds dw2 wrong.") #if dw[2] % 2 != 0 or dw[2] - base_addr >= end_marker_pos - 3:
# print("Align & Bounds dw2 wrong.")
# sys.exit(1) # sys.exit(1)
if dw[3] % 2 != 0 or dw[3] - base_addr >= marker_end - 3: # Assumes third dword points to fwid
print("Align & Bounds dw3 wrong.") #if dw[3] % 2 != 0 or dw[3] - base_addr >= end_marker_pos - 3:
# print("Align & Bounds dw3 wrong.")
# sys.exit(1) # sys.exit(1)
print("Base address is probably 0x{:x}".format(base_addr))
# hwid = dw[2] - base_addr # hwid = dw[2] - base_addr
# fwid = dw[3] - base_addr # fwid = dw[3] - base_addr