Class: Cabriolet::LIT::Parser

Inherits:
Object
  • Object
show all
Defined in:
lib/cabriolet/lit/parser.rb

Overview

Parser for Microsoft Reader LIT files

Handles parsing of the complex LIT file structure including:

  • Primary and secondary headers with piece table

  • IFCM/AOLL/AOLI directory chunks with encoded integers

  • DataSpace sections with transform layers

  • Manifest file with filename mappings

Based on the openclit/SharpLit reference implementation.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(io_system = nil) ⇒ Parser

Returns a new instance of Parser.



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# File 'lib/cabriolet/lit/parser.rb', line 21

def initialize(io_system = nil)
  @io_system = io_system || System::IOSystem.new
end

Instance Attribute Details

#io_system ⇒ Object (readonly)

Returns the value of attribute io_system.



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# File 'lib/cabriolet/lit/parser.rb', line 19

def io_system
  @io_system
end

Instance Method Details

#parse(filename) ⇒ Models::LITFile

Parse a LIT file and return the model

Parameters:

  • filename (String) —

    Path to LIT file

Returns:

Raises:

  • (Errors::ParseError) —

    if file is invalid or unsupported



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# File 'lib/cabriolet/lit/parser.rb', line 30

def parse(filename)
  handle = @io_system.open(filename, Constants::MODE_READ)

  begin
    lit_file = Models::LITFile.new

    # Parse primary header
    parse_primary_header(handle, lit_file)

    # Parse pieces
    pieces = parse_pieces(handle, lit_file)

    # Parse secondary header
    parse_secondary_header(handle, lit_file, pieces)

    # Parse directory from piece 1
    parse_directory(handle, lit_file, pieces[1])

    # Parse sections
    parse_sections(handle, lit_file)

    # Parse manifest
    parse_manifest(handle, lit_file)

    lit_file
  ensure
    @io_system.close(handle) if handle
  end
end