Created
March 22, 2019 17:02
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Functions for parsing Serato DJ crates
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import struct | |
def decode_struct(data): | |
ret = [] | |
i = 0 | |
while i < len(data): | |
tag = data[i:i+4].decode('ascii') | |
length = struct.unpack('>I', data[i+4:i+8])[0] | |
value = data[i+8:i+8+length] | |
value = decode(value, tag=tag) | |
ret.append((tag, value)) | |
i += 8 + length | |
return ret | |
def decode_unicode(data): | |
return data.decode('utf-16-be') | |
def decode_unsigned(data): | |
return struct.unpack('>I', data)[0] | |
def noop(data): | |
return data | |
DECODE_FUNC_FULL = { | |
None: decode_struct, | |
'vrsn': decode_unicode, | |
'sbav': noop, | |
} | |
DECODE_FUNC_FIRST = { | |
'o': decode_struct, | |
't': decode_unicode, | |
'p': decode_unicode, | |
'u': decode_unsigned, | |
'b': noop, | |
} | |
def decode(data, tag=None): | |
if tag in DECODE_FUNC_FULL: | |
decode_func = DECODE_FUNC_FULL[tag] | |
else: | |
decode_func = DECODE_FUNC_FIRST[tag[0]] | |
return decode_func(data) | |
def loadcrate(fname): | |
with open(fname, 'rb') as f: | |
return decode(f.read()) |
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