Module: XmpToolkitRuby::XmpCharForm

Defined in:
lib/xmp_toolkit_ruby/xmp_char_form.rb

Constant Summary collapse

CHAR_FORM =

Mapping of character format and byte-order masks (charForm enum)

{
  # Byte-order masks (do not use directly)
  little_endian_mask: 0x0000_0001, # kXMP_CharLittleEndianMask
  char_16bit_mask: 0x0000_0002, # kXMP_Char16BitMask
  char_32bit_mask: 0x0000_0004, # kXMP_Char32BitMask

  # Character format constants
  char_8bit: 0x0000_0000, # kXMP_Char8Bit
  char_16bit_big: 0x0000_0002, # kXMP_Char16BitBig
  char_16bit_little: 0x0000_0003, # kXMP_Char16BitLittle
  char_32bit_big: 0x0000_0004, # kXMP_Char32BitBig
  char_32bit_little: 0x0000_0005, # kXMP_Char32BitLittle
  char_unknown: 0x0000_0001 # kXMP_CharUnknown
}.freeze
CHAR_FORM_BY_VALUE =

Reverse lookup by value

CHAR_FORM.invert.freeze

Class Method Summary collapse

Class Method Details

.flags_for(bitmask) ⇒ Object

For a bitmask combining masks, return all matching names.

Examples:

XmpCharForm.flags_for(0x0003) # => [:char_16bit_mask, :little_endian_mask, :char_16bit_little]





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# File 'lib/xmp_toolkit_ruby/xmp_char_form.rb', line 40

def flags_for(bitmask)
  CHAR_FORM.select { |_, v| (bitmask & v).nonzero? }.keys
end

.name_for(value) ⇒ Object

Lookup the charForm name for a given integer value.

Examples:

XmpCharForm.name_for(4) # => :char_32bit_big





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# File 'lib/xmp_toolkit_ruby/xmp_char_form.rb', line 34

def name_for(value)
  CHAR_FORM_BY_VALUE[value]
end

.value_for(name) ⇒ Object

Lookup the integer value for a given charForm name (Symbol or String).

Examples:

XmpCharForm.value_for(:char_16bit_little) # => 3





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# File 'lib/xmp_toolkit_ruby/xmp_char_form.rb', line 27

def value_for(name)
  key = name.is_a?(String) ? name.to_sym : name
  CHAR_FORM[key]
end