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# File 'lib/docpdf/adapters/stampers/combine_pdf.rb', line 12
def stamp(data, stamps, page_indices: nil)
source = ::CombinePDF.parse(data)
source_page = source.pages.first
raise ConversionError, "Cannot stamp a PDF with no pages" unless source_page
page_w = source_page[:MediaBox][2].to_f
page_h = source_page[:MediaBox][3].to_f
stamp_page_data = generate_stamp_page(stamps, page_w, page_h)
stamp_page = ::CombinePDF.parse(stamp_page_data).pages.first
source.pages.each_with_index do |page, idx|
page << stamp_page if page_indices.nil? || page_indices.include?(idx)
end
source.to_pdf
rescue ::CombinePDF::ParsingError, *PRAWN_ERRORS, Errno::ENOENT => e
raise ConversionError, "CombinePDF failed to stamp PDF: #{e.message}"
end
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