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Contents
# This is an "interface" that should be implemented by any digest class
# passed into FileChecksum. Note that this isn't strictly enforced at
# the moment, and this class isn't directly used. It is merely here for
# documentation of structure of the class.
class DigestClass
def update(string); end
def hexdigest; end
end
class FileChecksum
BUFFER_SIZE = 1024 * 8
# Initializes an object to calculate the checksum of a file. The given
# ``digest_klass`` should implement the ``DigestClass`` interface. Note
# that the built-in Ruby digest classes duck type this properly:
# Digest::MD5, Digest::SHA1, etc.
def initialize(path, digest_klass)
@digest_klass = digest_klass
@path = path
end
# This calculates the checksum of the file and returns it as a
# string.
#
# @return [String]
def checksum
digest = @digest_klass.new
buf = ''
File.open(@path, "rb") do |f|
while !f.eof
begin
f.readpartial(BUFFER_SIZE, buf)
digest.update(buf)
rescue EOFError
# Although we check for EOF earlier, this seems to happen
# sometimes anyways [GH-2716].
break
end
end
end
return digest.hexdigest
end
end
Version data entries
46 entries across 39 versions & 6 rubygems