Loop through header information in a ZIP file
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import struct
data = open('myfile.zip', 'rb').read()
start = 0
for i in range(3): # show the first 3 file headers
start += 14
fields = struct.unpack('LLLHH', data[start:start+16])
crc32, comp_size, uncomp_size, filenamesize, extra_size = fields
start += 16
filename = data[start:start+filenamesize]
start += filenamesize
extra = data[start:start+extra_size]
print filename, hex(crc32), comp_size, uncomp_size
start += extra_size + comp_size # skip to the next header
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