class Xlsxrb::Ooxml::ZipReader::EntryStreamIO

IO-like stream wrapper that decompresses entry chunks on demand without full buffering.

Constants

DEFAULT_CHUNK_SIZE

Attributes

compressed_size [R] untyped

compression_method [R] untyped

data_offset [R] untyped

Public Class Methods

new (io, data_offset, compressed_size, compression_method, max_uncompressed_size: nil)

(untyped io, Integer data_offset, Integer compressed_size, Integer compression_method, ?max_uncompressed_size: Integer?) → void

Source

# File lib/xlsxrb/ooxml/zip_reader.rb, line 41
def initialize(io, data_offset, compressed_size, compression_method, max_uncompressed_size: nil)
  @io = io
  @data_offset = data_offset
  @compressed_size = compressed_size
  @compression_method = compression_method
  @max_uncompressed_size = max_uncompressed_size || ZipReader::MAX_UNCOMPRESSED_SIZE
  @buffer = +""
  @bytes_read_compressed = 0
  @total_uncompressed = 0
  @eof = false
  @closed = false
  @bom_checked = false
  @inflater = @compression_method == 8 ? Zlib::Inflate.new(-Zlib::MAX_WBITS) : nil
end

Public Instance Methods

close ()

() → void

Source

# File lib/xlsxrb/ooxml/zip_reader.rb, line 98
def close
  return if @closed

  @closed = true
  begin
    @inflater&.reset
  rescue StandardError
    nil
  end
  @inflater&.close
  @inflater = nil
  @buffer.clear
  nil
end

closed? ()

() → bool

Source

# File lib/xlsxrb/ooxml/zip_reader.rb, line 114
def closed?
  @closed
end

each_chunk (chunk_size = DEFAULT_CHUNK_SIZE) { |chunk| ... }

(?Integer chunk_size) ?{ (String) → void } → (void | Enumerator[String, void])

Source

# File lib/xlsxrb/ooxml/zip_reader.rb, line 86
def each_chunk(chunk_size = DEFAULT_CHUNK_SIZE, &block)
  return enum_for(:each_chunk, chunk_size) unless block
  raise IOError, "closed stream" if @closed

  while (chunk = read(chunk_size))
    break if chunk.nil? || chunk.empty?

    yield chunk
  end
end

eof? ()

() → bool

Source

# File lib/xlsxrb/ooxml/zip_reader.rb, line 119
def eof?
  @eof && @buffer.empty?
end

read (length = nil)

(?Integer? length) → String?

Source

# File lib/xlsxrb/ooxml/zip_reader.rb, line 57
def read(length = nil)
  raise IOError, "closed stream" if @closed

  check_bom_encoding!

  if length.nil?
    result = @buffer.dup
    @buffer.clear
    while (chunk = fetch_chunk(DEFAULT_CHUNK_SIZE))
      result << chunk
    end
    return result
  end

  return "" if length.zero?

  while @buffer.bytesize < length && !@eof
    chunk = fetch_chunk([length - @buffer.bytesize, DEFAULT_CHUNK_SIZE].max)
    break unless chunk

    @buffer << chunk
  end

  return nil if @buffer.empty? && @eof

  @buffer.slice!(0, length)
end