JezK

Edit File: content_disposition_parser.rl

# frozen_string_literal: true
require 'mail/utilities'
require 'mail/parser_tools'

%%{
  machine content_disposition;
  alphtype int;

# Disposition Type
  action disp_type_s { disp_type_s = p }
  action disp_type_e { content_disposition.disposition_type = chars(data, disp_type_s, p-1).downcase }

# Parameter Attribute
  action param_attr_s { param_attr_s = p }
  action param_attr_e { param_attr = chars(data, param_attr_s, p-1) }

# Quoted String
  action qstr_s { qstr_s = p }
  action qstr_e { qstr = chars(data, qstr_s, p-1) }

# Parameter Value
  action param_val_s { param_val_s = p }
  action param_val_e {
    if param_attr.nil?
      raise Mail::Field::ParseError.new(Mail::ContentDispositionElement, data, "no attribute for value")
    end

# Use quoted string value if one exists, otherwise use parameter value
    value = qstr || chars(data, param_val_s, p-1)

content_disposition.parameters << { param_attr => value }
    param_attr = nil
    qstr = nil
  }

# No-op actions
  action comment_e { }
  action comment_s { }
  action phrase_e { }
  action phrase_s { }
  action main_type_e { }
  action main_type_s { }
  action sub_type_e { }
  action sub_type_s { }

include rfc2183_content_disposition "rfc2183_content_disposition.rl";
  main := disposition;
}%%

module Mail::Parsers
  module ContentDispositionParser
    extend Mail::ParserTools

ContentDispositionStruct = Struct.new(:disposition_type, :parameters, :error)

%%write data noprefix;

def self.parse(data)
      data = data.dup.force_encoding(Encoding::ASCII_8BIT) if data.respond_to?(:force_encoding)

content_disposition = ContentDispositionStruct.new('', [])
      return content_disposition if Mail::Utilities.blank?(data)

# Parser state
      disp_type_s = param_attr_s = param_attr = qstr_s = qstr = param_val_s = nil

# 5.1 Variables Used by Ragel
      p = 0
      eof = pe = data.length
      stack = []

%%write init;
      %%write exec;

if p != eof || cs < %%{ write first_final; }%%
        raise Mail::Field::IncompleteParseError.new(Mail::ContentDispositionElement, data, p)
      end

content_disposition
    end
  end
end

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