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diff --git a/src/csv.hpp b/src/csv.hpp
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+++ b/src/csv.hpp
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+#ifndef CEPIS_SRC_CSV_HPP
+#define CEPIS_SRC_CSV_HPP
+
+#include <string>
+#include <string_view>
+#include <vector>
+
+namespace cepis::detail {
+
+/// Parses RFC 4180 CSV into rows of fields.
+///
+/// Values may contain commas, quotes and newlines when double-quoted, with
+/// `""` as the escape — splitting on `,` would corrupt exactly the street
+/// names most likely to matter. A leading UTF-8 BOM is dropped, `\r\n` and
+/// `\n` both end a record, and a trailing newline does not produce an empty
+/// final row.
+std::vector<std::vector<std::string>> parse_csv(std::string_view text);
+
+}  // namespace cepis::detail
+
+#endif  // CEPIS_SRC_CSV_HPP