initial import

.gitignore

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+*.gem
+.bundle
+Gemfile.lock
+pkg/*

Gemfile

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+source "http://rubygems.org"
+
+# Specify your gem's dependencies in scanner.gemspec
+gemspec

Rakefile

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+require 'bundler'
+Bundler::GemHelper.install_tasks

lib/sane.rb

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+module Sane
+  class << self
+    def init
+      version_code = FFI::MemoryPointer.new(:int)
+      check_status!(API.sane_init(version_code, FFI::Pointer::NULL))
+      version_code.read_int
+    end
+
+    def exit
+      API.sane_exit
+    end
+
+    def get_devices
+      devices_pointer = FFI::MemoryPointer.new(:pointer)
+      check_status!(API.sane_get_devices(devices_pointer, 0))
+      devices = devices_pointer.read_pointer
+      [].tap do |result|
+        until devices.read_pointer.null?
+          result << API::Device.new(devices.read_pointer)
+          devices += FFI.type_size(:pointer)
+        end
+      end
+    end
+
+    def open(device_name)
+      device_handle_pointer = FFI::MemoryPointer.new(:pointer)
+      check_status!(API.sane_open(device_name.to_s, device_handle_pointer))
+      device_handle_pointer.read_pointer
+    end
+
+    def close(device_handle)
+      API.sane_close(device_handle)
+    end
+
+    def check_status!(status)
+      raise Error.new(API.sane_strstatus(status), status) if status != :good
+    end
+  end
+end

lib/sane/api.rb

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+module Sane
+  module API
+    extend FFI::Library
+
+    ffi_lib "sane"
+
+    enum :status, [:good, 0, :unsupported, :cancelled, :device_busy, :inval, :eof, :jammed, :no_docs, :cover_open, :io_error, :no_mem, :access_denied]
+    enum :value_type, [:bool, 0, :int, :fixed, :string, :button, :group]
+    enum :unit, [:none, 0, :pixel, :bit, :mm, :dpi, :percent, :microsecond]
+    enum :action, [:get_value, 0, :set_value, :set_auto]
+    enum :frame, [:gray, :rgb, :red, :green, :blue]
+
+    class Device < FFI::Struct
+      layout :name, :string, :vendor, :string, :model, :string, :type, :string
+
+      def to_s; self[:name] end
+      def inspect; "#<#{self.class.name}:'#{to_s}'>" end
+    end
+
+    class OptionDescriptor < FFI::Struct
+      class ConstraintType < FFI::Union
+        layout :string_list, :pointer, :word_list, :pointer, :range, :pointer
+      end
+      layout :name, :string, :title, :string, :desc, :string, :type, :value_type, :unit, :unit, :size, :int, :cap, :int, :constraint_type, ConstraintType
+    end
+
+    class Parameters < FFI::Struct
+      layout :format, :frame, :last_frame, :int, :bytes_per_line, :int, :pixels_per_line, :int, :lines, :int, :depth, :int
+    end
+
+    # extern SANE_Status sane_init (SANE_Int * version_code, SANE_Auth_Callback authorize);
+    attach_function :sane_init, [:pointer, :pointer], :status
+    # extern void sane_exit (void);
+    attach_function :sane_exit, [], :void
+    # extern SANE_Status sane_get_devices (const SANE_Device *** device_list, SANE_Bool local_only);
+    attach_function :sane_get_devices, [:pointer, :int], :status
+    # extern SANE_Status sane_open (SANE_String_Const devicename, SANE_Handle * handle);
+    attach_function :sane_open, [:string, :pointer], :status
+    # extern void sane_close (SANE_Handle handle);
+    attach_function :sane_close, [:pointer], :void
+    # extern const SANE_Option_Descriptor * sane_get_option_descriptor (SANE_Handle handle, SANE_Int option);
+    attach_function :sane_get_option_descriptor, [:pointer, :int], :pointer
+    # extern SANE_Status sane_control_option (SANE_Handle handle, SANE_Int option, SANE_Action action, void *value, SANE_Int * info);
+    attach_function :sane_control_option, [:pointer, :int, :action, :pointer, :pointer], :status
+    # extern SANE_Status sane_get_parameters (SANE_Handle handle, SANE_Parameters * params);
+    attach_function :sane_get_parameters, [:pointer, :pointer], :status
+    # extern SANE_Status sane_start (SANE_Handle handle);
+    attach_function :sane_start, [:pointer], :status
+    # extern SANE_Status sane_read (SANE_Handle handle, SANE_Byte * data, SANE_Int max_length, SANE_Int * length);
+    attach_function :sane_read, [:pointer, :pointer, :int, :pointer], :status
+    # extern void sane_cancel (SANE_Handle handle);
+    attach_function :sane_cancel, [:pointer], :void
+    # extern SANE_Status sane_set_io_mode (SANE_Handle handle, SANE_Bool non_blocking);
+    attach_function :sane_set_io_mode, [:pointer, :int], :status
+    # extern SANE_Status sane_get_select_fd (SANE_Handle handle, SANE_Int * fd);
+    attach_function :sane_get_select_fd, [:pointer, :pointer], :status
+    # extern SANE_String_Const sane_strstatus (SANE_Status status);
+    attach_function :sane_strstatus, [:status], :string
+  end
+end

lib/sane/device.rb

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+module Sane
+  class Device
+    def initialize(handle)
+      @handle = handle
+    end
+
+    def close
+      Sane.close(@handle)
+    end
+  end
+end

lib/sane/error.rb

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+module Sane
+  class Error < StandardError
+    attr_reader :status
+
+    def initialize(message, status)
+      super(message)
+      @status = status
+    end
+  end
+end

lib/scanner.rb

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+require "ffi"
+
+require "sane"
+require "sane/api"
+require "sane/error"
+
+module Scanner
+
+end

lib/scanner/sane.rb

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+module Scanner
+  module Sane
+
+  end
+end

lib/scanner/version.rb

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+module Scanner
+  VERSION = "0.0.1"
+end

scanner.gemspec

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+# -*- encoding: utf-8 -*-
+$:.push File.expand_path("../lib", __FILE__)
+require "scanner/version"
+
+Gem::Specification.new do |s|
+  s.name        = "scanner"
+  s.version     = Scanner::VERSION
+  s.platform    = Gem::Platform::RUBY
+  s.authors     = ["Jakub Kuźma"]
+  s.email       = ["qoobaa@gmail.com"]
+  s.homepage    = ""
+  s.summary     = %q{SANE bindings}
+  s.description = %q{Scanner Access now Easier}
+
+  # s.rubyforge_project = "scanner"
+
+  s.add_dependency "ffi"
+
+  s.files         = `git ls-files`.split("\n")
+  s.test_files    = `git ls-files -- {test,spec,features}/*`.split("\n")
+  s.executables   = `git ls-files -- bin/*`.split("\n").map{ |f| File.basename(f) }
+  s.require_paths = ["lib"]
+end