ISMN.h

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/*
 * ISMN.h
 *    PostgreSQL type definitions for ISNs (ISBN, ISMN, ISSN, EAN13, UPC)
 *
 * Information recompiled by Kronuz on November 12, 2004
 * http://www.ismn-international.org
 *
 * IDENTIFICATION
 *    contrib/isn/ISMN.h
 *
 * M-3452-4680-5 <=> (0)-3452-4680-5 <=> 0345246805 <=> 9790345246805 <=> 979-0-3452-4680-5
 *
 *             (M counts as 3)
 * ISMN         M   3   4    5   2   4   6    8   0
 * Weight       3   1   3    1   3   1   3    1   3
 * Product      9 + 3 + 12 + 5 + 6 + 4 + 18 + 8 + 0 = 65
 *              65 / 10 = 6 remainder 5
 * Check digit  10 - 5 = 5
 * => M-3452-4680-5
 *
 * ISMN         9   7    9   0   3   4    5   2   4   6    8   0
 * Weight       1   3    1   3   1   3    1   3   1   3    1   3
 * Product      9 + 21 + 9 + 0 + 3 + 12 + 5 + 6 + 4 + 18 + 8 + 0 = 95
 *              95 / 10 = 9 remainder 5
 * Check digit  10 - 5 = 5
 * => 979-0-3452-4680-5
 *
 * Since mod10(9*1 + 7*3 + 9*1 + 0*3) = mod10(M*3) = mod10(3*3) = 9; the check digit remains the same.
 *
 */
 
/* where the digit set begins, and how many of them are in the table */
static const unsigned ISMN_index[10][2] = {
    {0, 5},
    {5, 0},
    {5, 0},
    {5, 0},
    {5, 0},
    {5, 0},
    {5, 0},
    {5, 0},
    {5, 0},
    {5, 0},
};
static const char *ISMN_range[][2] = {
    {"0-000", "0-099"},
    {"0-1000", "0-3999"},
    {"0-40000", "0-69999"},
    {"0-700000", "0-899999"},
    {"0-9000000", "0-9999999"},
    {NULL, NULL}
};