ENH: Ingest ITKIOFDF into Modules/IO

Modules/IO/IOFDF/CMakeLists.txt

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+project(IOFDF)
+set(IOFDF_LIBRARIES IOFDF)
+
+itk_module_impl()

Modules/IO/IOFDF/LICENSE

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+
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Modules/IO/IOFDF/README.md

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+# IOFDF
+
+In-tree ITK module providing read support for the **FDF** (Flexible
+Data Format) image files produced by Varian / Agilent MR scanners.
+Implements `itk::FDFImageIO` and registers `itk::FDFImageIOFactory`
+so FDF files are auto-detected by `itk::ImageFileReader`.
+
+## Origin
+
+Ingested from the standalone remote module
+[**InsightSoftwareConsortium/ITKIOFDF**](https://github.com/InsightSoftwareConsortium/ITKIOFDF)
+on 2026-05-05, at upstream commit
+[`3a3ff84c`](https://github.com/InsightSoftwareConsortium/ITKIOFDF/commit/3a3ff84c803d4226176078d32ddd0760c71a5b2c).
+The upstream repository will be archived read-only after this PR
+merges; it remains reachable at the URL above.
+
+## What lives here
+
+Per the v4 ingestion strategy (see
+`Utilities/Maintenance/RemoteModuleIngest/INGESTION_STRATEGY_v4.md`),
+only paths matching the narrow whitelist
+(`Utilities/Maintenance/RemoteModuleIngest/whitelists/IOFDF.list`)
+crossed the merge boundary:
+
+- `include/` — public C++ headers (`itkFDFImageIO.h`,
+  `itkFDFImageIOFactory.h`, `itkFDFCommonImageIO.h`).
+- `src/` — implementation sources.
+- `test/` — CTest drivers and content-link stubs.
+- `wrapping/` — Python wrapping descriptors.
+- `CMakeLists.txt`, `itk-module.cmake` — module metadata.
+- `LICENSE` — original Apache-2.0 license text.
+
+Upstream-only artifacts (CI dashboards, packaging,
+`pyproject.toml`, `.github/`, etc.) were explicitly excluded; the
+upstream commit graph and authorship history are otherwise preserved
+through a `--no-ff --allow-unrelated-histories` Mode-A merge.
+
+## Building
+
+IOFDF is enabled by default once `Module_IOFDF=ON` is set; in CI it
+is enabled via `pyproject.toml`'s `configure-ci` task.

Modules/IO/IOFDF/include/itkFDFCommonImageIO.h

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+/*=========================================================================
+ *
+ *  Copyright NumFOCUS
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *         https://www.apache.org/licenses/LICENSE-2.0.txt
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ *=========================================================================*/
+#ifndef itkFDFCommonImageIO_h
+#define itkFDFCommonImageIO_h
+
+#include <itkFDFImageIO.h>
+#include <itkIndent.h>
+
+#include <iostream>
+#include <fstream>
+#include <sstream>
+#include <vector>
+#include <iterator>
+#include <algorithm>
+
+namespace itk
+{
+
+std::string
+RemoveCharacters(std::string, char);
+
+void
+Tokenize(const std::string & str, std::vector<std::string> & tokens, const std::string & delimiters = " ");
+
+std::string
+ParseLine(std::string line);
+
+template <typename T>
+void
+ConvertFromString(std::string s, T & value)
+{
+  std::stringstream str;
+  str << s;
+  str >> value;
+}
+
+template <typename T>
+void
+StringToVector(std::string value, std::vector<T> & values)
+{
+  std::vector<std::string> tokens;
+
+  // value consists of something like {256,256}
+  std::string::size_type startBracketPosition = value.find_first_of("{", 0);
+  std::string::size_type endBracketPosition = value.find_first_of("}", startBracketPosition);
+
+  if (startBracketPosition != std::string::npos && endBracketPosition != std::string::npos)
+  {
+    std::string elements = value.substr(startBracketPosition + 1, endBracketPosition - startBracketPosition - 1);
+
+
+    Tokenize(elements, tokens, ",");
+  }
+
+  T element;
+
+  for (auto & token : tokens)
+  {
+    ConvertFromString(token, element);
+    values.push_back(element);
+  }
+}
+
+template <typename T>
+void
+PrintVector(std::ostream & os, std::string name, const std::vector<T> & vect)
+{
+  int size = vect.size();
+
+  os << name << " {";
+
+  for (int i = 0; i < size; i++)
+  {
+    os << vect[i];
+
+    if (i < size - 1)
+      os << ", ";
+  }
+
+  os << "}" << std::endl;
+}
+
+} // namespace itk
+
+#endif