1 files changed, 52 insertions, 0 deletions
diff --git a/src/tax_table.h b/src/tax_table.h
new file mode 100644
index 0000000..31683ac
--- /dev/null
+++ b/src/tax_table.h
@@ -0,0 +1,52 @@
+#ifndef BOKF_TAX_TABLE_H
+#define BOKF_TAX_TABLE_H
+
+#include <sqlite3.h>
+#include <stddef.h>
+#include <stdint.h>
+
+#include "util.h"
+
+/* One record from Skatteverket's fixed-width allmanna-tabeller-manad.txt.
+   Income and tax are öre; % records carry percent x100 in pct with
+   tax_ore 0, B records carry the whole-krona tax x100 in tax_ore. */
+struct tax_row {
+    int table_no;
+    int column_no;
+    int64_t income_from_ore;
+    int64_t income_to_ore; /* < 0 = open-ended top range */
+    int64_t tax_ore;
+    int64_t pct;
+    int is_pct;
+};
+
+/* Parses the fixed-width file (UTF-8 BOM tolerated); skips blank lines.
+   Returns 0 with a malloc'd rows array, -1 with a message otherwise. */
+int tax_table_parse(const unsigned char *data, size_t len,
+                    struct tax_row **out, size_t *out_n, char **err);
+
+/* Replaces year's rows and meta. The caller owns the transaction: on failure
+   the caller rolls the whole thing back. */
+int tax_table_store(sqlite3 *db, int year, const struct tax_row *rows,
+                    size_t n, const char *source_url,
+                    const unsigned char sha256[32], const char *fetched_at,
+                    char **err);
+
+/* Looks up the B range containing gross_ore. 0 = found; 1 = gross is above
+   the tabulated B range; 2 = no B range contains it (or none stored);
+   -1 = database error. % rows exist in the table but wave 1 refuses to
+   guess how Skatteverket applies them. */
+int tax_table_lookup(sqlite3 *db, int year, int table_no, int column_no,
+                     int64_t gross_ore, int64_t *tax_ore);
+
+/* HTTPS GET with the system trust store, following up to five redirects.
+   Returns 0 and the body, -1 with a message. */
+int tax_table_https_get(const char *url, struct buf *out, char **err);
+
+/* Downloads the official monthly table for year: finds the year's link on
+   Skatteverket's page in document order (current year first), downloads it
+   and returns the bytes and the absolute source URL. */
+int tax_table_fetch_year(int year, unsigned char **data, size_t *len,
+                         char **source_url, char **err);
+
+#endif