greenplumn ISMN 源码
greenplumn ISMN 代码
文件路径：/contrib/isn/ISMN.h
/*
* 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 */
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},
};
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}
};
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