Refactored the bacnet file object to be storage agnostic with callbacks. (#1056)

ports/posix/bacfile-posix.h

@@ -0,0 +1,53 @@
+/**
+ * @file
+ * @brief A POSIX BACnet File Object implementation.
+ * @author Steve Karg
+ * @date July 2025
+ * @copyright SPDX-License-Identifier: MIT
+ */
+#ifndef BACNET_FILE_POSIX_H
+#define BACNET_FILE_POSIX_H
+/* BACnet Stack defines - first */
+#include "bacnet/bacdef.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+BACNET_STACK_EXPORT
+size_t bacfile_posix_file_size(const char *pathname);
+BACNET_STACK_EXPORT
+bool bacfile_posix_file_size_set(const char *pathname, size_t file_size);
+BACNET_STACK_EXPORT
+size_t bacfile_posix_read_stream_data(
+    const char *pathname,
+    size_t fileStartPosition,
+    uint8_t *fileData,
+    size_t fileDataLen);
+BACNET_STACK_EXPORT
+size_t bacfile_posix_write_stream_data(
+    const char *pathname,
+    size_t fileStartPosition,
+    const uint8_t *fileData,
+    size_t fileDataLen);
+BACNET_STACK_EXPORT
+bool bacfile_posix_write_record_data(
+    const char *pathname,
+    size_t fileStartRecord,
+    size_t fileIndexRecord,
+    const uint8_t *fileData,
+    size_t fileDataLen);
+BACNET_STACK_EXPORT
+bool bacfile_posix_read_record_data(
+    const char *pathname,
+    size_t fileStartRecord,
+    size_t fileIndexRecord,
+    uint8_t *fileData,
+    size_t fileDataLen);
+BACNET_STACK_EXPORT
+void bacfile_posix_init(void);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+#endif