Class: Mix1::Writer

Inherits:
Object
  • Object
show all
Defined in:
lib/mix1.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(file_path:, package:, memory_buffer: false, buffer_size: DEFAULT_BUFFER_SIZE) ⇒ Writer

Returns a new instance of Writer.



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# File 'lib/mix1.rb', line 273

def initialize(file_path:, package:, memory_buffer: false, buffer_size: DEFAULT_BUFFER_SIZE)
  @package = package

  @buffer = MemoryBuffer.new(file_path: file_path, mode: :write, buffer_size: buffer_size)
  @buffer.pos = 0

  @buffer.write("MIX1")

  files = @package.files.sort_by(&:file_crc)

  @buffer.pos = 16

  files.each do |file|
    file.content_offset = @buffer.pos
    file.content_length = file.data.length
    @buffer.write(file.data)

    @buffer.pos += -@buffer.pos & 7
  end

  file_data_offset = @buffer.pos
  write_i32(files.count)

  files.each do |file|
    write_u32(file.file_crc.to_i(16))
    write_u32(file.content_offset)
    write_u32(file.content_length)
  end

  file_name_offset = @buffer.pos
  write_i32(files.count)

  files.each do |file|
    write_byte(file.name.length + 1)
    @buffer.write("#{file.name}\0")
  end

  @buffer.write_header(data_offset: file_data_offset, name_offset: file_name_offset)
ensure
  @buffer&.close
end

Instance Attribute Details

#package ⇒ Object (readonly)

Returns the value of attribute package.



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# File 'lib/mix1.rb', line 271

def package
  @package
end

Instance Method Details

#write_byte(byte) ⇒ Object 



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# File 'lib/mix1.rb', line 323

def write_byte(byte)
  @buffer.write([byte].pack("c"))
end

#write_i32(int) ⇒ Object 



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# File 'lib/mix1.rb', line 315

def write_i32(int)
  @buffer.write([int].pack("l"))
end

#write_u32(uint) ⇒ Object 



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# File 'lib/mix1.rb', line 319

def write_u32(uint)
  @buffer.write([uint].pack("L"))
end