Class: Rpdfium::Attachment

Inherits:
Object
  • Object
show all
Defined in:
lib/rpdfium/structure/attachment.rb

Overview

File embedded nel PDF (allegati). PDFium li espone via FPDFDoc_GetAttachment.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(document, index) ⇒ Attachment

Returns a new instance of Attachment.

Raises:



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# File 'lib/rpdfium/structure/attachment.rb', line 8

def initialize(document, index)
  @document = document
  @index    = index
  @handle   = Raw.FPDFDoc_GetAttachment(document.handle, index)
  raise Error, "Attachment #{index} not found" if @handle.null?
end

Instance Attribute Details

#document ⇒ Object (readonly)

Returns the value of attribute document.



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# File 'lib/rpdfium/structure/attachment.rb', line 6

def document
  @document
end

#handle ⇒ Object (readonly)

Returns the value of attribute handle.



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# File 'lib/rpdfium/structure/attachment.rb', line 6

def handle
  @handle
end

#index ⇒ Object (readonly)

Returns the value of attribute index.



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# File 'lib/rpdfium/structure/attachment.rb', line 6

def index
  @index
end

Instance Method Details

#bytes ⇒ Object

Ritorna i bytes del file allegato. Pattern probe-then-fetch.



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# File 'lib/rpdfium/structure/attachment.rb', line 20

def bytes
  out_size = FFI::MemoryPointer.new(:ulong)
  Raw.FPDFAttachment_GetFile(@handle, FFI::Pointer::NULL, 0, out_size)
  n = out_size.read_ulong
  return "" if n.zero?

  buf = FFI::MemoryPointer.new(:uchar, n)
  Raw.FPDFAttachment_GetFile(@handle, buf, n, out_size)
  # Leggo n byte (la dimensione del MIO buffer), non out_size.read_ulong:
  # PDFium può aggiornare out_size con un valore diverso da n (es. dim
  # totale necessaria) che leggerebbe oltre il buffer → IndexError.
  # Se la write effettiva è < n, riempie il resto con NUL.
  buf.read_bytes(n)
end

#name ⇒ Object 



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# File 'lib/rpdfium/structure/attachment.rb', line 15

def name
  Raw.read_utf16_string(:FPDFAttachment_GetName, @handle)
end

#save(path) ⇒ Object 



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# File 'lib/rpdfium/structure/attachment.rb', line 35

def save(path)
  File.binwrite(path, bytes)
  path
end