parser.rb in hexapdf-0.9.0

- old
+ new

@@ -43,10 +43,13 @@
   # This class also contains higher-level methods for getting indirect objects and revisions.
   #
   # See: PDF1.7 s7
   class Parser
 
+    # The IO stream which is parsed.
+    attr_reader :io
+
     # Creates a new parser for the given IO object.
     #
     # PDF references are resolved using the associated Document object.
     def initialize(io, document)
       @io = io
@@ -268,10 +271,12 @@
     #
     # If strict parsing is disabled, the whole file is searched for the offset.
     #
     # See: PDF1.7 s7.5.5, ADB1.7 sH.3-3.4.4
     def startxref_offset
+      return @startxref_offset if defined?(@startxref_offset)
+
       @io.seek(0, IO::SEEK_END)
       step_size = 1024
       pos = @io.pos
       eof_not_found = startxref_missing = false
 
@@ -299,10 +304,10 @@
       elsif startxref_missing
         maybe_raise("PDF file trailer is missing startxref keyword", pos: pos,
                     force: eof_index < 2 || lines[eof_index - 2].strip != "startxref")
       end
 
-      lines[eof_index - 1].to_i
+      @startxref_offset = lines[eof_index - 1].to_i
     end
 
     # Returns the PDF version number that is stored in the file header.
     #
     # See: PDF1.7 s7.5.2