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\\\\\1\<\/td\>\<\/tr\>\\2\<\/td\>\<\/tr\>\\3\<\/td\>\<\/tr\>\\4\<\/td\>\<\/tr\>\\5\<\/td\>\<\/tr\>\\6\<\/td\>\<\/tr\>\\7\<\/td\>\<\/tr\>\\8\<\/td\>\<\/tr\>\\9\<\/td\>\<\/tr\>\\10\<\/td\>\<\/tr\>\\11\<\/td\>\<\/tr\>\\12\<\/td\>\<\/tr\>\\13\<\/td\>\<\/tr\>\\14\<\/td\>\<\/tr\>\\15\<\/td\>\<\/tr\>\\16\<\/td\>\<\/tr\>\\17\<\/td\>\<\/tr\>\\18\<\/td\>\<\/tr\>\\19\<\/td\>\<\/tr\>\\20\<\/td\>\<\/tr\>\\21\<\/td\>\<\/tr\>\\22\<\/td\>\<\/tr\>\\23\<\/td\>\<\/tr\>\\24\<\/td\>\<\/tr\>\\25\<\/td\>\<\/tr\>\\26\<\/td\>\<\/tr\>\\27\<\/td\>\<\/tr\>\\28\<\/td\>\<\/tr\>\\29\<\/td\>\<\/tr\>\\30\<\/td\>\<\/tr\>\\31\<\/td\>\<\/tr\>\\32\<\/td\>\<\/tr\>\\33\<\/td\>\<\/tr\>\\34\<\/td\>\<\/tr\>\<\/table\>\<\/td\>\\\\\\\#include\ \<\;erl\_driver\.h\>\;\<\/span\>\<\/td\>\<\/tr\>\\\\#include\ \<\;ei\.h\>\;\<\/span\>\<\/td\>\<\/tr\>\\\\#include\ \<\;stdio\.h\>\;\<\/span\>\<\/td\>\<\/tr\>\\\\#include\ \<\;string\.h\>\;\<\/span\>\<\/td\>\<\/tr\>\\\\#include\ \<\;db\.h\>\;\<\/span\>\<\/td\>\<\/tr\>\\\\<\/td\>\<\/tr\>\\\\/\/\ Path\ to\ file\ where\ data\ will\ be\ stored\.\ \<\/span\>\<\/td\>\<\/tr\>\\\\/\/\ It\ will\ be\ created\ if\ it\ doesn\&\#39\;t\ exist\<\/span\>\<\/td\>\<\/tr\>\\\\#define\ DB\_PATH\ \"\;\.\/store\.db\"\;\<\/span\>\<\/td\>\<\/tr\>\\\\<\/td\>\<\/tr\>\\\\/\/\ Binary\ commands\ between\ Erlang\ VM\ and\ Driver\<\/span\>\<\/td\>\<\/tr\>\\\\#define\ CMD\_PUT\ 1\<\/span\>\<\/td\>\<\/tr\>\\\\#define\ CMD\_GET\ 2\<\/span\>\<\/td\>\<\/tr\>\\\\#define\ CMD\_DEL\ 3\<\/span\>\<\/td\>\<\/tr\>\\\\<\/td\>\<\/tr\>\\\\/\/\ Number\ of\ bytes\ for\ each\ key\<\/span\>\<\/td\>\<\/tr\>\\\\/\/\ \(160\ bits\ for\ SHA1\ hash\)\<\/span\>\<\/td\>\<\/tr\>\\\\#define\ KEY\_SIZE\ 20\<\/span\>\<\/td\>\<\/tr\>\\\\<\/td\>\<\/tr\>\\\\/\/\ Define\ struct\ to\ hold\ state\ across\ calls\<\/span\>\<\/td\>\<\/tr\>\\\typedef\<\/span\>\ \struct\<\/span\>\ \\_bdb\_drv\_t\<\/span\>\ \\{\<\/span\>\<\/td\>\<\/tr\>\\\ \ \ErlDrvPort\<\/span\>\ \port\<\/span\>\\;\<\/span\>\<\/td\>\<\/tr\>\\\ \<\/td\>\<\/tr\>\\\ \ \DB\<\/span\>\ \\*\<\/span\>\db\<\/span\>\\;\<\/span\>\<\/td\>\<\/tr\>\\\\}\<\/span\>\ \bdb\_drv\_t\<\/span\>\\;\<\/span\>\<\/td\>\<\/tr\>\\\\<\/td\>\<\/tr\>\\\\<\/td\>\<\/tr\>\\\static\<\/span\>\ \ErlDrvData\<\/span\>\ \start\<\/span\>\\(\<\/span\>\ErlDrvPort\<\/span\>\ \port\<\/span\>\\,\<\/span\>\ \char\<\/span\>\\*\<\/span\>\ \cmd\<\/span\>\\)\;\<\/span\>\<\/td\>\<\/tr\>\\\static\<\/span\>\ \void\<\/span\>\ \stop\<\/span\>\\(\<\/span\>\ErlDrvData\<\/span\>\ \handle\<\/span\>\\)\;\<\/span\>\<\/td\>\<\/tr\>\\\static\<\/span\>\ \void\<\/span\>\ \outputv\<\/span\>\\(\<\/span\>\ErlDrvData\<\/span\>\ \handle\<\/span\>\\,\<\/span\>\ \ErlIOVec\<\/span\>\ \\*\<\/span\>\ev\<\/span\>\\)\;\<\/span\>\<\/td\>\<\/tr\>\\\static\<\/span\>\ \void\<\/span\>\ \put\<\/span\>\\(\<\/span\>\bdb\_drv\_t\<\/span\>\ \\*\<\/span\>\bdb\_drv\<\/span\>\\,\<\/span\>\ \ErlIOVec\<\/span\>\ \\*\<\/span\>\ev\<\/span\>\\)\;\<\/span\>\<\/td\>\<\/tr\>\\\static\<\/span\>\ \void\<\/span\>\ \get\<\/span\>\\(\<\/span\>\bdb\_drv\_t\<\/span\>\ \\*\<\/span\>\bdb\_drv\<\/span\>\\,\<\/span\>\ \ErlIOVec\<\/span\>\ \\*\<\/span\>\ev\<\/span\>\\)\;\<\/span\>\<\/td\>\<\/tr\>\\\static\<\/span\>\ \void\<\/span\>\ \del\<\/span\>\\(\<\/span\>\bdb\_drv\_t\<\/span\>\ \\*\<\/span\>\bdb\_drv\<\/span\>\\,\<\/span\>\ \ErlIOVec\<\/span\>\ \\*\<\/span\>\ev\<\/span\>\\)\;\<\/span\>\<\/td\>\<\/tr\>\\\static\<\/span\>\ \void\<\/span\>\ \unkown\<\/span\>\\(\<\/span\>\bdb\_drv\_t\<\/span\>\ \\*\<\/span\>\bdb\_drv\<\/span\>\