Macintosh-Tools/python-rsrcfork
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Fix overflow with empty resource files or empty resource type entries

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This commit is contained in:
dgelessus 2017-07-14 13:50:21 +02:00
parent d6de63e17b
commit c207703c9f
2 changed files with 31 additions and 21 deletions
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5
README.rst
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@ -138,6 +138,11 @@ __ https://archive.fo/
Changelog
---------
Version 1.1.1
`````````````
* Fixed overflow issue with empty resource files or empty resource type entries
Version 1.1.0
`````````````

47
rsrcfork.py
View File

@ -345,14 +345,16 @@ class ResourceFile(collections.abc.Mapping):
self._reference_counts: typing.MutableMapping[bytes, int] = collections.OrderedDict()
(type_list_length_m1,) = self._stream_unpack(STRUCT_RESOURCE_TYPE_LIST_HEADER)
type_list_length = (type_list_length_m1 + 1) % 0x10000
for _ in range(type_list_length_m1 + 1):
for _ in range(type_list_length):
(
resource_type,
count_m1,
reflist_offset,
) = self._stream_unpack(STRUCT_RESOURCE_TYPE)
self._reference_counts[resource_type] = count_m1 + 1
count = (count_m1 + 1) % 0x10000
self._reference_counts[resource_type] = count
def _read_all_references(self):
"""Read all resource references, starting at the current stream position."""
@ -745,25 +747,28 @@ def main(args: typing.Sequence[str]):
else:
print("No file attributes")
print(f"{len(rf)} resource types:")
for typecode, resources in rf.items():
restype = _bytes_escape(typecode, quote="'")
print(f"'{restype}': {len(resources)} resources:")
for resid, res in rf[typecode].items():
if res.name is None:
name = "unnamed"
else:
name = _bytes_escape(res.name, quote='"')
name = f'name "{name}"'
attrs = _decompose_flags(res.attributes)
if attrs:
attrdesc = " | ".join(attr.name for attr in attrs)
else:
attrdesc = "no attributes"
print(f"({resid}), {name}, {attrdesc}, {len(res.data)} bytes")
print()
if len(rf) > 0:
print(f"{len(rf)} resource types:")
for typecode, resources in rf.items():
restype = _bytes_escape(typecode, quote="'")
print(f"'{restype}': {len(resources)} resources:")
for resid, res in rf[typecode].items():
if res.name is None:
name = "unnamed"
else:
name = _bytes_escape(res.name, quote='"')
name = f'name "{name}"'
attrs = _decompose_flags(res.attributes)
if attrs:
attrdesc = " | ".join(attr.name for attr in attrs)
else:
attrdesc = "no attributes"
print(f"({resid}), {name}, {attrdesc}, {len(res.data)} bytes")
print()
else:
print("No resource types (empty resource file)")
sys.exit(0)