Sha256: c6355fe77ff41a8542404d859e9f3f65335394ebf124823b8c3647220686429b

Contents?: true

Size: 1.66 KB

Versions: 39

Compression:

Stored size: 1.66 KB

Contents

module Aws
  module S3

    # A utility class that provides an IO-like interface to a portion of
    # a file on disk.
    # @api private
    class FilePart

      # @option options [required,String,Pathname,File,Tempfile] :source
      # @option options [required,Integer] :offset The file part will read
      #   starting at this byte offset.
      # @option options [required,Integer] :size The maximum number of bytes to
      #   read from the `:offset`.
      def initialize(options = {})
        @source = options[:source]
        @first_byte = options[:offset]
        @last_byte = @first_byte + options[:size]
        @size = options[:size]
        @file = nil
      end

      # @return [String,Pathname,File,Tempfile]
      attr_reader :source

      # @return [Integer]
      attr_reader :first_byte

      # @return [Integer]
      attr_reader :last_byte

      # @return [Integer]
      attr_reader :size

      def read(bytes = nil, output_buffer = nil)
        open_file unless @file
        read_from_file(bytes, output_buffer)
      end

      def rewind
        if @file
          @file.seek(@first_byte)
          @position = @first_byte
        end
        0
      end

      def close
        @file.close if @file
      end

      private

      def open_file
        @file = File.open(@source, 'rb')
        rewind
      end

      def read_from_file(bytes, output_buffer)
        length = [remaining_bytes, *bytes].min
        data   = @file.read(length, output_buffer)

        @position += data ? data.bytesize : 0

        data.to_s unless bytes && (data.nil? || data.empty?)
      end

      def remaining_bytes
        @last_byte - @position
      end

    end
  end
end

Version data entries

39 entries across 39 versions & 1 rubygems

Version Path
aws-sdk-s3-1.48.0 lib/aws-sdk-s3/file_part.rb
aws-sdk-s3-1.47.0 lib/aws-sdk-s3/file_part.rb
aws-sdk-s3-1.46.0 lib/aws-sdk-s3/file_part.rb
aws-sdk-s3-1.45.0 lib/aws-sdk-s3/file_part.rb
aws-sdk-s3-1.44.0 lib/aws-sdk-s3/file_part.rb
aws-sdk-s3-1.43.0 lib/aws-sdk-s3/file_part.rb
aws-sdk-s3-1.42.0 lib/aws-sdk-s3/file_part.rb
aws-sdk-s3-1.41.0 lib/aws-sdk-s3/file_part.rb
aws-sdk-s3-1.40.0 lib/aws-sdk-s3/file_part.rb
aws-sdk-s3-1.39.0 lib/aws-sdk-s3/file_part.rb
aws-sdk-s3-1.38.0 lib/aws-sdk-s3/file_part.rb
aws-sdk-s3-1.37.0 lib/aws-sdk-s3/file_part.rb
aws-sdk-s3-1.36.1 lib/aws-sdk-s3/file_part.rb
aws-sdk-s3-1.36.0 lib/aws-sdk-s3/file_part.rb
aws-sdk-s3-1.35.0 lib/aws-sdk-s3/file_part.rb
aws-sdk-s3-1.34.0 lib/aws-sdk-s3/file_part.rb
aws-sdk-s3-1.33.0 lib/aws-sdk-s3/file_part.rb
aws-sdk-s3-1.32.0 lib/aws-sdk-s3/file_part.rb
aws-sdk-s3-1.31.0 lib/aws-sdk-s3/file_part.rb
aws-sdk-s3-1.30.1 lib/aws-sdk-s3/file_part.rb