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annotate bin/ed2k @ 639:c107e18388a2

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Probably better diff algorithm
author nanaya <me@nanaya.pro>
date Sat, 29 Feb 2020 23:06:14 +0000
parents 94ee419ad047
children bcdf320dabf4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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4
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1 #!/usr/bin/env ruby
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2 require 'openssl'
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3
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4 def file_ed2k(file_name, output_mode = "hash")
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5 ed2k_block = 9500*1024 #ed2k block size is 9500 KiB
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6 ed2k_hash = ""
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7 file = File.open(file_name, 'rb')
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8 file_size = file.stat.size #while at it, fetch the size of the file
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9 while (block = file.read(ed2k_block)) do
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10 ed2k_hash << OpenSSL::Digest::MD4.digest(block) #hashes are concatenated md4 per block size for ed2k hash
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11 end
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12 ed2k_hash << OpenSSL::Digest::MD4.digest("") if file_size % ed2k_block == 0 #on size of modulo block size, append another md4 hash of a blank string
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13 file.close
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14 ed2k_hash = OpenSSL::Digest::MD4.hexdigest(ed2k_hash) #finally
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15 return case output_mode #there are 2 modes, just the has, or complete with link.
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16 when "hash"
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17 ed2k_hash
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18 when "link"
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19 "ed2k://|file|#{File.basename(file_name)}|#{file_size}|#{ed2k_hash}|"
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20 end
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21 end
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22
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23 ARGV.each do |file_name|
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24 next unless File.file?(file_name) and File.readable?(file_name)
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25 printf("%s\n", file_ed2k(file_name,"link"))
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26 end