Sha256: 057371f868754fc120c1d71e93eaafab7331ea543aa9863a143bfb57612ee0f8
Contents?: true
Size: 788 Bytes
Versions: 19
Compression:
Stored size: 788 Bytes
Contents
module AppleTvConverter
module MovieHasher
CHUNK_SIZE = 64 * 1024 # in bytes
def self.compute_hash(filename)
filesize = File.size(filename)
hash = filesize
# Read 64 kbytes, divide up into 64 bits and add each
# to hash. Do for beginning and end of file.
File.open(filename, 'rb') do |f|
# Q = unsigned long long = 64 bit
f.read(CHUNK_SIZE).unpack("Q*").each do |n|
hash = hash + n & 0xffffffffffffffff # to remain as 64 bit number
end
f.seek([0, filesize - CHUNK_SIZE].max, IO::SEEK_SET)
# And again for the end of the file
f.read(CHUNK_SIZE).unpack("Q*").each do |n|
hash = hash + n & 0xffffffffffffffff
end
end
sprintf("%016x", hash)
end
end
end
Version data entries
19 entries across 19 versions & 1 rubygems