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