Module: WahWah::Helper
- Defined in:
- lib/wahwah/helper.rb
Class Method Summary collapse
- .byte_string_to_guid(byte_string) ⇒ Object
- .encode_to_utf8(string, source_encoding: "") ⇒ Object
- .file_format(file_path) ⇒ Object
-
.id3_size_caculate(bits_string, has_zero_bit: true) ⇒ Object
ID3 size is encoded with four bytes where may the most significant bit (bit 7) is set to zero in every byte, making a total of 28 bits.
- .split_with_terminator(string, terminator_size) ⇒ Object
Class Method Details
.byte_string_to_guid(byte_string) ⇒ Object
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# File 'lib/wahwah/helper.rb', line 32 def self.byte_string_to_guid(byte_string) guid = byte_string.unpack("NnnA*").pack("VvvA*").unpack1("H*") [guid[0..7], guid[8..11], guid[12..15], guid[16..19], guid[20..]].join("-").upcase end |
.encode_to_utf8(string, source_encoding: "") ⇒ Object
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# File 'lib/wahwah/helper.rb', line 5 def self.encode_to_utf8(string, source_encoding: "") encoded_string = source_encoding.empty? ? string.force_encoding("utf-8") : string.encode("utf-8", source_encoding, invalid: :replace, undef: :replace, replace: "") encoded_string.valid_encoding? ? encoded_string.strip : "" end |
.file_format(file_path) ⇒ Object
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# File 'lib/wahwah/helper.rb', line 28 def self.file_format(file_path) File.extname(file_path).downcase.delete(".") end |
.id3_size_caculate(bits_string, has_zero_bit: true) ⇒ Object
ID3 size is encoded with four bytes where may the most significant bit (bit 7) is set to zero in every byte, making a total of 28 bits. The zeroed bits are ignored
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# File 'lib/wahwah/helper.rb', line 16 def self.id3_size_caculate(bits_string, has_zero_bit: true) if has_zero_bit bits_string.scan(/.{8}/).map { |byte_string| byte_string[1..] }.join.to_i(2) else bits_string.to_i(2) end end |
.split_with_terminator(string, terminator_size) ⇒ Object
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# File 'lib/wahwah/helper.rb', line 24 def self.split_with_terminator(string, terminator_size) string.split(Regexp.new(('\x00' * terminator_size).b), 2) end |