PyPDF2 编码问题 PyPDF2.utils.PdfReadError Illegal character in Name Object

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PyPDF2 编码问题 PyPDF2.utils.PdfReadError Illegal character in Name Object

参考资料：https://github.com/mstamy2/PyPDF2/issues/438

使用 PyPDF2 做合并 PDF 文件时报错如下：

Traceback (most recent call last):
  File "D:\projects\myproject\venv\lib\site-packages\PyPDF2\generic.py", line 484, in readFromStream
    return NameObject(name.decode('utf-8'))
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xcb in position 8: invalid continuation byte

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "D:\projects\myproject\apps\backstage\views\busi_contract_manage_view.py", line 703, in post
    merge_pdf_result = merge_pdf(final_files, pdf_path)
  File "D:\projects\myproject\apps\utils\doc_convert_util.py", line 86, in merge_pdf
    pdf_writer.write(new_file)
  File "D:\projects\myproject\venv\lib\site-packages\PyPDF2\pdf.py", line 482, in write
    self._sweepIndirectReferences(externalReferenceMap, self._root)
  File "D:\projects\myproject\venv\lib\site-packages\PyPDF2\pdf.py", line 571, in _sweepIndirectReferences
    self._sweepIndirectReferences(externMap, realdata)
  File "D:\projects\myproject\venv\lib\site-packages\PyPDF2\pdf.py", line 547, in _sweepIndirectReferences
    value = self._sweepIndirectReferences(externMap, value)
  File "D:\projects\myproject\venv\lib\site-packages\PyPDF2\pdf.py", line 571, in _sweepIndirectReferences
    self._sweepIndirectReferences(externMap, realdata)
  File "D:\projects\myproject\venv\lib\site-packages\PyPDF2\pdf.py", line 547, in _sweepIndirectReferences
    value = self._sweepIndirectReferences(externMap, value)
  File "D:\projects\myproject\venv\lib\site-packages\PyPDF2\pdf.py", line 556, in _sweepIndirectReferences
    value = self._sweepIndirectReferences(externMap, data[i])
  File "D:\projects\myproject\venv\lib\site-packages\PyPDF2\pdf.py", line 571, in _sweepIndirectReferences
    self._sweepIndirectReferences(externMap, realdata)
  File "D:\projects\myproject\venv\lib\site-packages\PyPDF2\pdf.py", line 547, in _sweepIndirectReferences
    value = self._sweepIndirectReferences(externMap, value)
  File "D:\projects\myproject\venv\lib\site-packages\PyPDF2\pdf.py", line 547, in _sweepIndirectReferences
    value = self._sweepIndirectReferences(externMap, value)
  File "D:\projects\myproject\venv\lib\site-packages\PyPDF2\pdf.py", line 547, in _sweepIndirectReferences
    value = self._sweepIndirectReferences(externMap, value)
  File "D:\projects\myproject\venv\lib\site-packages\PyPDF2\pdf.py", line 577, in _sweepIndirectReferences
    newobj = data.pdf.getObject(data)
  File "D:\projects\myproject\venv\lib\site-packages\PyPDF2\pdf.py", line 1611, in getObject
    retval = readObject(self.stream, self)
  File "D:\projects\myproject\venv\lib\site-packages\PyPDF2\generic.py", line 66, in readObject
    return DictionaryObject.readFromStream(stream, pdf)
  File "D:\projects\myproject\venv\lib\site-packages\PyPDF2\generic.py", line 579, in readFromStream
    value = readObject(stream, pdf)
  File "D:\projects\myproject\venv\lib\site-packages\PyPDF2\generic.py", line 60, in readObject
    return NameObject.readFromStream(stream, pdf)
  File "D:\projects\myproject\venv\lib\site-packages\PyPDF2\generic.py", line 492, in readFromStream
    raise utils.PdfReadError("Illegal character in Name Object")
PyPDF2.utils.PdfReadError: Illegal character in Name Object

找到对应的报错文件 

File "D:\projects\myproject\venv\lib\site-packages\PyPDF2\generic.py", line 484

第484行 原代码：

try:
    return NameObject(name.decode('utf-8'))
except (UnicodeEncodeError, UnicodeDecodeError) as e:
    # Name objects should represent irregular characters
    # with a '#' followed by the symbol's hex number
    if not pdf.strict:
        warnings.warn("Illegal character in Name Object", utils.PdfReadWarning)
        return NameObject(name)
    else:
        raise utils.PdfReadError("Illegal character in Name Object")

在 except 中加入代码 

return NameObject(name.decode('gbk'))

修改后

try:
    return NameObject(name.decode('utf-8'))
except (UnicodeEncodeError, UnicodeDecodeError) as e:
    try:
        return NameObject(name.decode('gbk'))
    except (UnicodeEncodeError, UnicodeDecodeError) as e:
        # Name objects should represent irregular characters
        # with a '#' followed by the symbol's hex number
        if not pdf.strict:
            warnings.warn("Illegal character in Name Object", utils.PdfReadWarning)
            return NameObject(name)
        else:
            raise utils.PdfReadError("Illegal character in Name Object")

修改后仍会报错，需要修改修改另一处

Lib/site-packages/PyPDF2/utils.py 第238行

原代码

r = s.encode('latin-1')
if len(s) < 2:
    bc[s] = r
return r

 修改后代码：

try:
    r = s.encode('latin-1')
except Exception as e:
    r = s.encode('utf-8')
if len(s) < 2:
    bc[s] = r
return r