Class: Omnizip::Formats::SevenZip::Reader

Inherits:
Object
  • Object
show all
Includes:
Constants
Defined in:
lib/omnizip/formats/seven_zip/reader.rb

Overview

.7z archive reader Provides read-only access to .7z archives

Constant Summary

Constants included from Constants

Constants::MAJOR_VERSION, Constants::MAX_NUM_BONDS, Constants::MAX_NUM_CODERS, Constants::MAX_NUM_PACK_STREAMS, Constants::MINOR_VERSION, Constants::SIGNATURE, Constants::SIGNATURE_SIZE, Constants::START_HEADER_SIZE

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(file_path, options = {}) ⇒ Reader

Initialize reader with file path

Parameters:

  • file_path (String) —

    Path to .7z file

  • options (Hash) (defaults to: {}) —

    Reader options

Options Hash (options):

  • :password (String) —

    Password for encrypted headers

  • :offset (Integer) —

    Offset for embedded archives



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# File 'lib/omnizip/formats/seven_zip/reader.rb', line 22

def initialize(file_path, options = {})
  @file_path = file_path
  @entries = []
  @stream_info = nil
  @split_reader = nil
  @password = options[:password]
  @offset = options[:offset] || 0
  @solid_cache = {}
  @solid_cache_extracted = {}
end

Instance Attribute Details

#entries ⇒ Object (readonly)

Returns the value of attribute entries.



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# File 'lib/omnizip/formats/seven_zip/reader.rb', line 14

def entries
  @entries
end

#file_path ⇒ Object (readonly)

Returns the value of attribute file_path.



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# File 'lib/omnizip/formats/seven_zip/reader.rb', line 14

def file_path
  @file_path
end

#header ⇒ Object (readonly)

Returns the value of attribute header.



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# File 'lib/omnizip/formats/seven_zip/reader.rb', line 14

def header
  @header
end

#split_reader ⇒ Object (readonly)

Returns the value of attribute split_reader.



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# File 'lib/omnizip/formats/seven_zip/reader.rb', line 14

def split_reader
  @split_reader
end

#stream_info ⇒ Object (readonly)

Returns the value of attribute stream_info.



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# File 'lib/omnizip/formats/seven_zip/reader.rb', line 14

def stream_info
  @stream_info
end

Instance Method Details

#can_decrypt? ⇒ Boolean

Check if can decrypt headers (password provided)

Returns:

  • (Boolean) —

    true if password available for encrypted headers



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# File 'lib/omnizip/formats/seven_zip/reader.rb', line 173

def can_decrypt?
  encrypted? && !@password.nil?
end

#encrypted? ⇒ Boolean

Check if headers are encrypted

Returns:

  • (Boolean) —

    true if headers are encrypted



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# File 'lib/omnizip/formats/seven_zip/reader.rb', line 166

def encrypted?
  !@encrypted_header.nil?
end

#extract_all(output_dir) ⇒ Object

Extract all files to directory

Parameters:

  • output_dir (String) —

    Destination directory

Raises:

  • (RuntimeError) —

    on extraction error



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# File 'lib/omnizip/formats/seven_zip/reader.rb', line 134

def extract_all(output_dir)
  FileUtils.mkdir_p(output_dir)

  real_out = File.realpath(output_dir)

  @entries.each do |entry|
    next if entry.name.nil? || entry.name.empty?

    output_path = File.join(real_out, entry.name)
    expanded = File.expand_path(output_path)
    unless expanded.start_with?("#{real_out}#{File::SEPARATOR}") || expanded == real_out
      raise Omnizip::FormatError,
            "Path traversal detected: #{entry.name}"
    end

    extract_entry(entry.name, output_path)
  end
ensure
  @solid_cache.clear
  @solid_cache_extracted.clear
end

#extract_entry(entry_name, output_path) ⇒ Object

Extract file to output path

Parameters:

  • entry_name (String) —

    File name to extract

  • output_path (String) —

    Destination path

Raises:

  • (RuntimeError) —

    if entry not found or extraction fails



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# File 'lib/omnizip/formats/seven_zip/reader.rb', line 94

def extract_entry(entry_name, output_path)
  # Delegate to split reader if available
  if @split_reader
    @split_reader.extract_entry(entry_name, output_path)
    return
  end

  entry = @entries.find { |e| e.name == entry_name }
  raise "Entry not found: #{entry_name}" unless entry

  # Create directory if needed
  FileUtils.mkdir_p(File.dirname(output_path))

  # Extract file
  if entry.directory?
    FileUtils.mkdir_p(output_path)
  elsif entry.has_stream?
    File.open(@file_path, "rb") do |io|
      # Seek to offset for embedded archives
      io.seek(@offset) if @offset.positive?
      data = extract_entry_data(io, entry)
      File.binwrite(output_path, data)
    end

    # Set timestamp if available
    if entry.mtime
      File.utime(entry.atime || entry.mtime || Time.now,
                 entry.mtime || Time.now,
                 output_path)
    end
  else
    # Empty file
    FileUtils.touch(output_path)
  end
end

#extract_entry_data(io, entry) ⇒ String

Extract raw entry payload from the archive. Public so converters and parallel extractors can reuse the stream-positioning + decompression logic.

Parameters:

Returns:

  • (String) —

    Extracted bytes



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# File 'lib/omnizip/formats/seven_zip/reader.rb', line 184

def extract_entry_data(io, entry)
  extract_entry_data_private(io, entry)
end

#list_files ⇒ Array<Models::FileEntry>

List all files in archive

Returns:



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# File 'lib/omnizip/formats/seven_zip/reader.rb', line 85

def list_files
  @entries.reject { |e| e.name.nil? || e.name.empty? }
end

#open ⇒ Object

Open and parse .7z archive

Raises:

  • (RuntimeError) —

    if file cannot be opened or parsed



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# File 'lib/omnizip/formats/seven_zip/reader.rb', line 36

def open
  # Check if this is a split archive
  if split_archive?
    @split_reader = SplitArchiveReader.new(@file_path)
    @split_reader.open
    @header = @split_reader.header
    @entries = @split_reader.entries
    @stream_info = @split_reader.stream_info
  else
    File.open(@file_path, "rb") do |io|
      # Seek to offset for embedded archives
      io.seek(@offset) if @offset.positive?
      parse_archive(io)
    end
  end
  self
end

#split? ⇒ Boolean

Check if archive is split

Returns:

  • (Boolean) —

    true if split across multiple volumes



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# File 'lib/omnizip/formats/seven_zip/reader.rb', line 57

def split?
  @split_reader&.split? || false
end

#total_volumes ⇒ Integer

Get total number of volumes (for split archives)

Returns:

  • (Integer) —

    Number of volumes



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# File 'lib/omnizip/formats/seven_zip/reader.rb', line 64

def total_volumes
  @split_reader&.total_volumes || 1
end

#valid? ⇒ Boolean

Check if archive is valid .7z format

Returns:

  • (Boolean) —

    true if valid



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# File 'lib/omnizip/formats/seven_zip/reader.rb', line 159

def valid?
  !@header.nil? && @header.valid?
end

#volume_size ⇒ Integer

Get volume size (for split archives)

Returns:

  • (Integer) —

    Volume size in bytes



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# File 'lib/omnizip/formats/seven_zip/reader.rb', line 71

def volume_size
  @split_reader&.volume_size || File.size(@file_path)
end

#volumes ⇒ Array<String>

Get list of volumes (for split archives)

Returns:

  • (Array<String>) —

    Volume paths



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# File 'lib/omnizip/formats/seven_zip/reader.rb', line 78

def volumes
  @split_reader&.volumes || [@file_path]
end