make it possibile to set encoding

CONTRIBUTING.md

@@ -26,9 +26,12 @@ Here's the process to make changes to the codebase:
 2. Review [open pull requests](https://github.com/spdx/tools-python/pulls) before committing time to a substantial
  revision. Work along similar lines may already be in progress.
 
-3. Create a new branch:
+3. Create a new branch and set up environment:
  ```sh
  git checkout -b fix-or-improve-something
+ python -m venv ./venv
+ ./venv/bin/activate
+ pip install -e .
  ```
 4. Make some changes and commit them to the branch:
  ```sh

spdx/parsers/parse_anything.py

@@ -21,10 +21,11 @@
 from spdx.parsers.builderexceptions import FileTypeError
 
 
-def parse_file(fn):
+def parse_file(fn, encoding="utf-8"):
  builder_module = jsonyamlxmlbuilders
  read_data = False
  if fn.endswith(".rdf") or fn.endswith(".rdf.xml"):
+ encoding = None
  parsing_module = rdf
  builder_module = rdfbuilders
  elif fn.endswith(".tag") or fn.endswith(".spdx"):
@@ -43,7 +44,7 @@ def parse_file(fn):
  p = parsing_module.Parser(builder_module.Builder(), StandardLogger())
  if hasattr(p, "build"):
  p.build()
- with open(fn) as f:
+ with open(fn, "r", encoding=encoding) as f:
  if read_data:
  data = f.read()
  return p.parse(data)

spdx/writers/write_anything.py

@@ -18,11 +18,12 @@
 from spdx.parsers.builderexceptions import FileTypeError
 
 
-def write_file(doc, fn, validate=True):
+def write_file(doc, fn, validate=True, encoding="utf-8"):
  out_mode = "w"
  if fn.endswith(".rdf") or fn.endswith(".rdf.xml"):
  writer_module = rdf
  out_mode = "wb"
+ encoding = None
  elif fn.endswith(".tag") or fn.endswith(".spdx"):
  writer_module = tagvalue
  elif fn.endswith(".json"):
@@ -34,5 +35,5 @@ def write_file(doc, fn, validate=True):
  else:
  raise FileTypeError("FileType Not Supported")
 
- with open(fn, out_mode) as out:
+ with open(fn, out_mode, encoding=encoding) as out:
  p = writer_module.write_document(doc, out, validate)