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appcache: add new magic for Steam Client Beta (June 2024) #463

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appcache: add new magic for Steam Client Beta (June 2024) #463

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a32a23c
appcache: add new magic for Steam Client Beta (June 2024)
sonic2kk Jun 28, 2024
4863486
appcache: update comment examples
sonic2kk Jun 28, 2024
2ea9057
appcache: progress on reading past string table
sonic2kk Jun 28, 2024
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24 changes: 19 additions & 5 deletions steam/utils/appcache.py
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Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,7 @@

>>> header, apps = parse_appinfo(open('/d/Steam/appcache/appinfo.vdf', 'rb'))
>>> header
{'magic': b"(DV\\x07", 'universe': 1}
{'magic': b")DV\\x07", 'universe': 1}
>>> next(apps)
{'appid': 5,
'size': 79,
Expand Down Expand Up @@ -43,6 +43,7 @@

uint32 = struct.Struct('<I')
uint64 = struct.Struct('<Q')
int64 = struct.Struct('<q')

def parse_appinfo(fp):
"""Parse appinfo.vdf from the Steam appcache folder
Expand All @@ -53,7 +54,7 @@ def parse_appinfo(fp):
:return: (header, apps iterator)
"""
# format:
# uint32 - MAGIC: "'DV\x07" or "(DV\x07"
# uint32 - MAGIC: "'DV\x07" or "(DV\x07" or b")DV\x07"
# uint32 - UNIVERSE: 1
# ---- repeated app sections ----
# uint32 - AppID
Expand All @@ -69,11 +70,23 @@ def parse_appinfo(fp):
# uint32 - EOF: 0

magic = fp.read(4)
if magic not in (b"'DV\x07", b"(DV\x07"):
if magic not in (b"'DV\x07", b"(DV\x07", b")DV\x07"):
raise SyntaxError("Invalid magic, got %s" % repr(magic))

universe = uint32.unpack(fp.read(4))[0]

if magic == b')DV\x07':
# Read until end of null-terminated table string
string_table_offset = struct.unpack('q', fp.read(8))[0]
offset = fp.tell()
fp.seek(string_table_offset)
uint32.unpack(fp.read(4))[0]

c = b''
while c != b'\x00' or not c:
c = fp.read(1)
fp.seek(offset)

def apps_iter():
while True:
appid = uint32.unpack(fp.read(4))[0]
Expand All @@ -91,10 +104,11 @@ def apps_iter():
'change_number': uint32.unpack(fp.read(4))[0],
}

if magic == b"(DV\x07":
if magic != b"'DV\x07":
app['data_sha1'] = fp.read(20)

app['data'] = binary_load(fp)
# TODO reading data doesn't work
app['data'] = binary_load(fp)

yield app

Expand Down