95 lines
2.6 KiB
Ruby
95 lines
2.6 KiB
Ruby
module Sane
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class << self
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def init
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version_code = FFI::MemoryPointer.new(:int)
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check_status!(API.sane_init(version_code, FFI::Pointer::NULL))
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version_code.read_int
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end
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def exit
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API.sane_exit
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end
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def get_devices
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devices_pointer = FFI::MemoryPointer.new(:pointer)
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check_status!(API.sane_get_devices(devices_pointer, 0))
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devices = devices_pointer.read_pointer
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[].tap do |result|
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until devices.read_pointer.null?
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result << API::Device.new(devices.read_pointer)
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devices += FFI.type_size(:pointer)
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end
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end
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end
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def open(device_name)
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device_handle_pointer = FFI::MemoryPointer.new(:pointer)
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check_status!(API.sane_open(device_name.to_s, device_handle_pointer))
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device_handle_pointer.read_pointer
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end
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def close(device_handle)
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API.sane_close(device_handle)
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end
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def get_option_descriptor(device_handle, option)
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result = API.sane_get_option_descriptor(device_handle, option)
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API::OptionDescriptor.new(result)
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end
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def get_option(device_handle, option)
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descriptor = get_option_descriptor(device_handle, option)
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case descriptor[:type]
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when :string
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value_pointer = FFI::MemoryPointer.new(:pointer)
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when :bool, :int, :fixed
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value_pointer = FFI::MemoryPointer.new(:int)
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else
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return nil
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end
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check_status!(API.sane_control_option(device_handle, option, :get_value, value_pointer, FFI::Pointer::NULL))
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case descriptor[:type]
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when :string
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value_pointer.read_string
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when :bool
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!value_pointer.read_int.zero?
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when :int, :fixed
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value_pointer.read_int
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end
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end
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def set_option(device_handle, option, value)
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descriptor = get_option_descriptor(device_handle, option)
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case descriptor[:type]
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when :string
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value_pointer = FFI::MemoryPointer.from_string(value)
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when :int, :fixed
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value_pointer = FFI::MemoryPointer.new(:int).write_int(value)
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when :bool
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value_pointer = FFI::MemoryPointer.new(:int).write_int(value ? 1 : 0)
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else
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return nil
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end
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check_status!(API.sane_control_option(device_handle, option, :set_value, value_pointer, FFI::Pointer::NULL))
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case descriptor[:type]
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when :string
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value_pointer.read_string
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when :bool
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!value_pointer.read_int.zero?
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when :int, :fixed
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value_pointer.read_int
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end
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end
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def check_status!(status)
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raise Error.new(API.sane_strstatus(status), status) if status != :good
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end
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end
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end
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