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fix: Safer context handling in streams #170

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Merged
merged 4 commits into from
Sep 22, 2025
Merged

fix: Safer context handling in streams #170

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8dd6568
fix: 1
tmathern Sep 20, 2025
4979476
fix: Update c2pa.py code
tmathern Sep 20, 2025
60c0bac
fix: Renamings
tmathern Sep 21, 2025
31f94b5
fix: Format
tmathern Sep 21, 2025
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7 changes: 6 additions & 1 deletion src/c2pa/c2pa.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1123,9 +1123,14 @@ def flush_callback(ctx):
self._write_cb = WriteCallback(write_callback)
self._flush_cb = FlushCallback(flush_callback)

# Create a placeholder context as we don't actually use the context,
# but we need having a valid context pointer. Therefore, we create
# a small buffer and cast it to a StreamContext pointer
self._context = ctypes.create_string_buffer(1)

# Create the stream
self._stream = _lib.c2pa_create_stream(
None, # context
ctypes.cast(self._context, ctypes.POINTER(StreamContext)),
self._read_cb,
self._seek_cb,
self._write_cb,
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