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409 lines
12 KiB
409 lines
12 KiB
# frozen_string_literal: true
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class Pdfium
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extend FFI::Library
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LIB_NAME = 'pdfium'
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begin
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ffi_lib case FFI::Platform::OS
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when 'darwin'
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[
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"lib#{LIB_NAME}.dylib",
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'/Applications/LibreOffice.app/Contents/Frameworks/libpdfiumlo.dylib'
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]
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else
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"lib#{LIB_NAME}.so"
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end
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rescue LoadError => e
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raise "Could not load libpdfium library. Make sure it's installed and in your library path. Error: #{e.message}"
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end
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typedef :pointer, :FPDF_STRING
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typedef :pointer, :FPDF_DOCUMENT
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typedef :pointer, :FPDF_PAGE
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typedef :pointer, :FPDF_BITMAP
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typedef :pointer, :FPDF_FORMHANDLE
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MAX_SIZE = 32_767
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FPDF_ANNOT = 0x01
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FPDF_LCD_TEXT = 0x02
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FPDF_NO_NATIVETEXT = 0x04
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FPDF_GRAYSCALE = 0x08
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FPDF_REVERSE_BYTE_ORDER = 0x10
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FPDF_RENDER_LIMITEDIMAGECACHE = 0x200
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FPDF_RENDER_FORCEHALFTONE = 0x400
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FPDF_PRINTING = 0x800
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# rubocop:disable Naming/ClassAndModuleCamelCase
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class FPDF_LIBRARY_CONFIG < FFI::Struct
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layout :version, :int,
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:m_pUserFontPaths, :pointer,
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:m_pIsolate, :pointer,
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:m_v8EmbedderSlot, :uint,
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:m_pPlatform, :pointer,
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:m_RendererType, :int
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end
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# rubocop:enable Naming/ClassAndModuleCamelCase
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attach_function :FPDF_InitLibraryWithConfig, [:pointer], :void
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attach_function :FPDF_DestroyLibrary, [], :void
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attach_function :FPDF_LoadDocument, %i[string FPDF_STRING], :FPDF_DOCUMENT
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attach_function :FPDF_LoadMemDocument, %i[pointer int FPDF_STRING], :FPDF_DOCUMENT
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attach_function :FPDF_CloseDocument, [:FPDF_DOCUMENT], :void
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attach_function :FPDF_GetPageCount, [:FPDF_DOCUMENT], :int
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attach_function :FPDF_GetLastError, [], :ulong
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attach_function :FPDF_LoadPage, %i[FPDF_DOCUMENT int], :FPDF_PAGE
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attach_function :FPDF_ClosePage, [:FPDF_PAGE], :void
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attach_function :FPDF_GetPageWidthF, [:FPDF_PAGE], :float
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attach_function :FPDF_GetPageHeightF, [:FPDF_PAGE], :float
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attach_function :FPDFBitmap_Create, %i[int int int], :FPDF_BITMAP
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attach_function :FPDFBitmap_CreateEx, %i[int int int pointer int], :FPDF_BITMAP
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attach_function :FPDFBitmap_Destroy, [:FPDF_BITMAP], :void
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attach_function :FPDFBitmap_GetBuffer, [:FPDF_BITMAP], :pointer
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attach_function :FPDFBitmap_GetWidth, [:FPDF_BITMAP], :int
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attach_function :FPDFBitmap_GetHeight, [:FPDF_BITMAP], :int
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attach_function :FPDFBitmap_GetStride, [:FPDF_BITMAP], :int
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attach_function :FPDFBitmap_FillRect, %i[FPDF_BITMAP int int int int ulong], :void
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attach_function :FPDF_RenderPageBitmap, %i[FPDF_BITMAP FPDF_PAGE int int int int int int], :void
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typedef :int, :FPDF_BOOL
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typedef :pointer, :IPDF_JSPLATFORM
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# rubocop:disable Naming/ClassAndModuleCamelCase
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class FPDF_FORMFILLINFO_V2 < FFI::Struct
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layout :version, :int,
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:Release, :pointer,
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:FFI_Invalidate, :pointer,
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:FFI_OutputSelectedRect, :pointer,
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:FFI_SetCursor, :pointer,
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:FFI_SetTimer, :pointer,
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:FFI_KillTimer, :pointer,
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:FFI_GetLocalTime, :pointer,
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:FFI_OnChange, :pointer,
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:FFI_GetPage, :pointer,
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:FFI_GetCurrentPage, :pointer,
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:FFI_GetRotation, :pointer,
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:FFI_ExecuteNamedAction, :pointer,
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:FFI_SetTextFieldFocus, :pointer,
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:FFI_DoURIAction, :pointer,
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:FFI_DoGoToAction, :pointer,
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:m_pJsPlatform, :IPDF_JSPLATFORM,
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:xfa_disabled, :FPDF_BOOL,
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:FFI_DisplayCaret, :pointer,
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:FFI_GetCurrentPageIndex, :pointer,
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:FFI_SetCurrentPage, :pointer,
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:FFI_GotoURL, :pointer,
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:FFI_GetPageViewRect, :pointer,
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:FFI_PageEvent, :pointer,
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:FFI_PopupMenu, :pointer,
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:FFI_OpenFile, :pointer,
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:FFI_EmailTo, :pointer,
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:FFI_UploadTo, :pointer,
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:FFI_GetPlatform, :pointer,
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:FFI_GetLanguage, :pointer,
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:FFI_DownloadFromURL, :pointer,
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:FFI_PostRequestURL, :pointer,
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:FFI_PutRequestURL, :pointer,
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:FFI_OnFocusChange, :pointer,
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:FFI_DoURIActionWithKeyboardModifier, :pointer
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end
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# rubocop:enable Naming/ClassAndModuleCamelCase
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attach_function :FPDFDOC_InitFormFillEnvironment, %i[FPDF_DOCUMENT pointer], :FPDF_FORMHANDLE
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attach_function :FPDFDOC_ExitFormFillEnvironment, [:FPDF_FORMHANDLE], :void
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attach_function :FPDF_FFLDraw, %i[FPDF_FORMHANDLE FPDF_BITMAP FPDF_PAGE int int int int int int], :void
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FPDF_ERR_SUCCESS = 0
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FPDF_ERR_UNKNOWN = 1
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FPDF_ERR_FILE = 2
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FPDF_ERR_FORMAT = 3
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FPDF_ERR_PASSWORD = 4
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FPDF_ERR_SECURITY = 5
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FPDF_ERR_PAGE = 6
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PDFIUM_ERRORS = {
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FPDF_ERR_SUCCESS => 'Success',
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FPDF_ERR_UNKNOWN => 'Unknown error',
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FPDF_ERR_FILE => 'Error open file',
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FPDF_ERR_FORMAT => 'Invalid format',
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FPDF_ERR_PASSWORD => 'Incorrect password',
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FPDF_ERR_SECURITY => 'Security scheme error',
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FPDF_ERR_PAGE => 'Page not found'
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}.freeze
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class PdfiumError < StandardError; end
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def self.error_message(code)
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PDFIUM_ERRORS[code] || "Unknown error code: #{code}"
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end
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def self.check_last_error(context_message = 'PDFium operation failed')
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error_code = FPDF_GetLastError()
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return if error_code == FPDF_ERR_SUCCESS
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raise PdfiumError, "#{context_message}: #{error_message(error_code)} (Code: #{error_code})"
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end
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class Document
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attr_reader :document_ptr, :form_handle
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def initialize(document_ptr, source_buffer = nil)
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raise ArgumentError, 'document_ptr cannot be nil' if document_ptr.nil? || document_ptr.null?
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@document_ptr = document_ptr
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@pages = {}
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@closed = false
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@source_buffer = source_buffer
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@form_handle = FFI::Pointer::NULL
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@form_fill_info_mem = FFI::Pointer::NULL
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init_form_fill_environment
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end
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def init_form_fill_environment
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return if @document_ptr.null?
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@form_fill_info_mem = FFI::MemoryPointer.new(FPDF_FORMFILLINFO_V2.size)
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form_fill_info_struct = FPDF_FORMFILLINFO_V2.new(@form_fill_info_mem)
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form_fill_info_struct[:version] = 2
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@form_handle = Pdfium.FPDFDOC_InitFormFillEnvironment(@document_ptr, @form_fill_info_mem)
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end
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def page_count
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@page_count ||= Pdfium.FPDF_GetPageCount(@document_ptr)
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end
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def self.open_file(file_path, password = nil)
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doc_ptr = Pdfium.FPDF_LoadDocument(file_path, password)
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if doc_ptr.null?
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Pdfium.check_last_error("Failed to load document from file '#{file_path}'")
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raise PdfiumError, "Failed to load document from file '#{file_path}', pointer is NULL."
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end
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doc = new(doc_ptr)
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return doc unless block_given?
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begin
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yield doc
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ensure
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doc.close
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end
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end
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def self.open_bytes(bytes, password = nil)
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buffer = FFI::MemoryPointer.new(:char, bytes.bytesize)
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buffer.put_bytes(0, bytes)
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doc_ptr = Pdfium.FPDF_LoadMemDocument(buffer, bytes.bytesize, password)
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if doc_ptr.null?
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Pdfium.check_last_error('Failed to load document from memory')
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raise PdfiumError, 'Failed to load document from memory, pointer is NULL.'
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end
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doc = new(doc_ptr, buffer)
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return doc unless block_given?
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begin
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yield doc
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ensure
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doc.close
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end
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end
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def closed?
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@closed
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end
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def ensure_not_closed!
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raise PdfiumError, 'Document is closed.' if closed?
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end
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def get_page(page_index)
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ensure_not_closed!
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unless page_index.is_a?(Integer) && page_index >= 0 && page_index < page_count
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raise PdfiumError, "Page index #{page_index} out of range (0..#{page_count - 1})"
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end
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@pages[page_index] ||= Page.new(self, page_index)
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end
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def close
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return if closed?
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@pages.each_value { |page| page.close unless page.closed? }
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@pages.clear
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unless @form_handle.null?
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Pdfium.FPDFDOC_ExitFormFillEnvironment(@form_handle)
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@form_handle = FFI::Pointer::NULL
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end
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if @form_fill_info_mem && !@form_fill_info_mem.null?
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@form_fill_info_mem.free
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@form_fill_info_mem = FFI::Pointer::NULL
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end
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Pdfium.FPDF_CloseDocument(@document_ptr) unless @document_ptr.null?
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@document_ptr = FFI::Pointer::NULL
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@source_buffer = nil
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@closed = true
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end
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end
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class Page
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attr_reader :document, :page_index, :page_ptr
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def initialize(document, page_index)
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raise ArgumentError, 'Document object is required' unless document.is_a?(Pdfium::Document)
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@document = document
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@document.ensure_not_closed!
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@page_index = page_index
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@page_ptr = Pdfium.FPDF_LoadPage(document.document_ptr, page_index)
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if @page_ptr.null?
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Pdfium.check_last_error("Failed to load page #{page_index}")
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raise PdfiumError, "Failed to load page #{page_index}, pointer is NULL."
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end
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@closed = false
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end
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def width
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@width ||= Pdfium.FPDF_GetPageWidthF(@page_ptr)
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end
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def height
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@height ||= Pdfium.FPDF_GetPageHeightF(@page_ptr)
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end
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def closed?
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@closed
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end
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def form_handle
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@document.form_handle
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end
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def ensure_not_closed!
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raise PdfiumError, 'Page is closed.' if closed?
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@document.ensure_not_closed!
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end
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def render_to_bitmap(width: nil, height: nil, scale: nil, background_color: 0xFFFFFFFF,
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flags: FPDF_ANNOT | FPDF_LCD_TEXT | FPDF_NO_NATIVETEXT | FPDF_REVERSE_BYTE_ORDER)
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ensure_not_closed!
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render_width, render_height = calculate_render_dimensions(width, height, scale)
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bitmap_ptr = Pdfium.FPDFBitmap_Create(render_width, render_height, 1)
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if bitmap_ptr.null?
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Pdfium.check_last_error('Failed to create bitmap (potential pre-existing error)')
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raise PdfiumError, 'Failed to create bitmap (FPDFBitmap_Create returned NULL)'
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end
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Pdfium.FPDFBitmap_FillRect(bitmap_ptr, 0, 0, render_width, render_height, background_color)
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Pdfium.FPDF_RenderPageBitmap(bitmap_ptr, page_ptr, 0, 0, render_width, render_height, 0, flags)
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unless form_handle.null?
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Pdfium.FPDF_FFLDraw(form_handle, bitmap_ptr, page_ptr, 0, 0, render_width, render_height, 0, flags)
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end
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buffer_ptr = Pdfium.FPDFBitmap_GetBuffer(bitmap_ptr)
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stride = Pdfium.FPDFBitmap_GetStride(bitmap_ptr)
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bitmap_data = buffer_ptr.read_bytes(stride * render_height)
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[bitmap_data, render_width, render_height]
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ensure
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Pdfium.FPDFBitmap_Destroy(bitmap_ptr) if bitmap_ptr && !bitmap_ptr.null?
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end
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def close
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return if closed?
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Pdfium.FPDF_ClosePage(@page_ptr) unless @page_ptr.null?
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@page_ptr = FFI::Pointer::NULL
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@closed = true
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end
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private
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def calculate_render_dimensions(width_param, height_param, scale_param)
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if scale_param
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render_width = (width * scale_param).round
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render_height = (height * scale_param).round
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elsif width_param || height_param
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if width_param && height_param
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render_width = width_param
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render_height = height_param
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elsif width_param
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scale_factor = width_param.to_f / width
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render_width = width_param
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render_height = (height * scale_factor).round
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else
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scale_factor = height_param.to_f / height
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render_width = (width * scale_factor).round
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render_height = height_param
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end
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else
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render_width = width.to_i
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render_height = height.to_i
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end
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[render_width.clamp(1, MAX_SIZE), render_height.clamp(1, MAX_SIZE)]
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end
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end
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def self.initialize_library
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config_mem = FFI::MemoryPointer.new(FPDF_LIBRARY_CONFIG.size)
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config_struct = FPDF_LIBRARY_CONFIG.new(config_mem)
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config_struct[:version] = 2
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config_struct[:m_pUserFontPaths] = FFI::Pointer::NULL
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config_struct[:m_pIsolate] = FFI::Pointer::NULL
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config_struct[:m_v8EmbedderSlot] = 0
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FPDF_InitLibraryWithConfig(config_mem)
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end
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def self.cleanup_library
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FPDF_DestroyLibrary()
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end
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initialize_library
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at_exit do
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cleanup_library
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end
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end
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