1 files changed, 49 insertions, 0 deletions
diff --git a/contrib/isn/ISSN.h b/contrib/isn/ISSN.h
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+++ b/contrib/isn/ISSN.h
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+/*
+ * ISSN.h
+ *	  PostgreSQL type definitions for ISNs (ISBN, ISMN, ISSN, EAN13, UPC)
+ *
+ * Information recompiled by Kronuz on November 12, 2004
+ * http://www.issn.org/
+ *
+ * IDENTIFICATION
+ *	  contrib/isn/ISSN.h
+ *
+ * 1144-875X <=> 1144875(X) <=> 1144875 <=> (977)1144875 <=> 9771144875(00) <=> 977114487500(7) <=> 977-1144-875-00-7
+ *
+ *
+ * ISSN			1	1	4	 4	  8    7	5
+ * Weight		8	7	6	 5	  4    3	2
+ * Product		8 + 7 + 24 + 20 + 32 + 21 + 10 = 122
+ *				122 / 11 = 11 remainder 1
+ * Check digit	11 - 1 = 10 = X
+ * => 1144-875X
+ *
+ * ISSN			9	7	 7	 1	 1	 4	  4   8    7   5	0	0
+ * Weight		1	3	 1	 3	 1	 3	  1   3    1   3	1	3
+ * Product		9 + 21 + 7 + 3 + 1 + 12 + 4 + 24 + 7 + 15 + 0 + 0 = 103
+ *				103 / 10 = 10 remainder 3
+ * Check digit	10 - 3 = 7
+ * => 977-1144875-00-7 ??  <- supplemental number (number of the week, month, etc.)
+ *				  ^^ 00 for non-daily publications (01=Monday, 02=Tuesday, ...)
+ *
+ * The hyphenation is always in after the four digits of the ISSN code.
+ *
+ */
+
+/* where the digit set begins, and how many of them are in the table */
+const unsigned ISSN_index[10][2] = {
+	{0, 1},
+	{0, 1},
+	{0, 1},
+	{0, 1},
+	{0, 1},
+	{0, 1},
+	{0, 1},
+	{0, 1},
+	{0, 1},
+	{0, 1},
+};
+const char *ISSN_range[][2] = {
+	{"0000-000", "9999-999"},
+	{NULL, NULL}
+};