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Made dbgrbyd.py a bit more resilient to truncated data

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This commit is contained in:
Christopher Haster
2022-12-27 14:12:04 -06:00
parent a4fd070fc1
commit d6ad74555b
1 changed files with 3 additions and 3 deletions
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scripts/dbgrbyd.py
+3 -3
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@@ -103,7 +103,7 @@ def main(disk, block_size, block1, block2=None, *,
# first figure out which block as the most recent revision # first figure out which block as the most recent revision
def fetch(data): def fetch(data):
rev, = struct.unpack('<I', data[0:4]) rev, = struct.unpack('<I', data[0:4].ljust(4, b'\0'))
crc = crc32c(data[0:4]) crc = crc32c(data[0:4])
off = 0 off = 0
j = 4 j = 4
@@ -119,7 +119,7 @@ def main(disk, block_size, block1, block2=None, *,
crc = crc32c(data[j:j+size], crc) crc = crc32c(data[j:j+size], crc)
# found a crc? # found a crc?
else: else:
crc_, = struct.unpack('<I', data[j:j+4]) crc_, = struct.unpack('<I', data[j:j+4].ljust(4, b'\0'))
if crc != crc_: if crc != crc_:
break break
# commit what we have # commit what we have
@@ -234,7 +234,7 @@ def main(disk, block_size, block1, block2=None, *,
crc = crc32c(data[j:j+size], crc) crc = crc32c(data[j:j+size], crc)
# found a crc? # found a crc?
else: else:
crc_, = struct.unpack('<I', data[j:j+4]) crc_, = struct.unpack('<I', data[j:j+4].ljust(4, b'\0'))
if crc != crc_: if crc != crc_:
notes.append('crc!=%08x' % crc) notes.append('crc!=%08x' % crc)
j += size j += size