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Allow magic header be in middle of file #19

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Allow magic header be in middle of file #19

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22 changes: 17 additions & 5 deletions fsb5/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -113,11 +113,23 @@ class FSB5:
def __init__(self, data):
buf = BinaryReader(BytesIO(data), endian="<")

magic = buf.read(4)
if magic != b"FSB5":
raise ValueError("Expected magic header 'FSB5' but got %r" % (magic))

buf.seek(0)
chunk = 10240000
fpos = 0
while True:
ff = buf.read(chunk)
if not ff:
break
offset = ff.find(b"FSB5")
if offset > 0:
offset += fpos
break
fpos += chunk

if offset < 0:
buf.seek(0)
raise ValueError("Expected magic header 'FSB5' but got %r" % (buf.read(4)))

buf.seek(offset)
self.header = buf.read_struct_into(FSB5Header, "4s I I I I I I 8s 16s 8s")
if self.header.version == 0:
self.header = self.header._replace(unknown=buf.read_type("I"))
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