contrib/isn/ISSN.h

   1 /*
   2  * ISSN.h
   3  *        PostgreSQL type definitions for ISNs (ISBN, ISMN, ISSN, EAN13, UPC)
   4  *
   5  * Information recompiled by Kronuz on November 12, 2004
   6  * http://www.issn.org/
   7  *
   8  * IDENTIFICATION
   9  *        contrib/isn/ISSN.h
  10  *
  11  * 1144-875X <=> 1144875(X) <=> 1144875 <=> (977)1144875 <=> 9771144875(00) <=> 977114487500(7) <=> 977-1144-875-00-7
  12  *
  13  *
  14  * ISSN                 1       1       4        4        8    7        5
  15  * Weight               8       7       6        5        4    3        2
  16  * Product              8 + 7 + 24 + 20 + 32 + 21 + 10 = 122
  17  *                              122 / 11 = 11 remainder 1
  18  * Check digit  11 - 1 = 10 = X
  19  * => 1144-875X
  20  *
  21  * ISSN                 9       7        7       1       1       4        4   8    7   5        0       0
  22  * Weight               1       3        1       3       1       3        1   3    1   3        1       3
  23  * Product              9 + 21 + 7 + 3 + 1 + 12 + 4 + 24 + 7 + 15 + 0 + 0 = 103
  24  *                              103 / 10 = 10 remainder 3
  25  * Check digit  10 - 3 = 7
  26  * => 977-1144875-00-7 ??  <- supplemental number (number of the week, month, etc.)
  27  *                                ^^ 00 for non-daily publications (01=Monday, 02=Tuesday, ...)
  28  *
  29  * The hyphenation is always in after the four digits of the ISSN code.
  30  *
  31  */
  32
  33 /* where the digit set begins, and how many of them are in the table */
  34 const unsigned ISSN_index[10][2] = {
  35         {0, 1},
  36         {0, 1},
  37         {0, 1},
  38         {0, 1},
  39         {0, 1},
  40         {0, 1},
  41         {0, 1},
  42         {0, 1},
  43         {0, 1},
  44         {0, 1},
  45 };
  46 const char *ISSN_range[][2] = {
  47         {"0000-000", "9999-999"},
  48         {NULL, NULL}
  49 };