http://spserver.googlecode.com/files/spmemvfs-0.1.src.tar.gz
Changes:
* Modify the save callback, transfer the ownership of the buffer to callback
function
* Add a buffer map to pass buffer between application and sqlite3 vfs
The demo code:
static void * load( void * arg, const char * path, int * len )
{
spmembuffer_map_t * themap = (spmembuffer_map_t*)arg;
char * ret = spmembuffer_map_take( themap, path, len );
return ret;
}
static int save( void * arg, const char * path, char * buffer, int len )
{
spmembuffer_map_t * themap = (spmembuffer_map_t*)arg;
return spmembuffer_map_put( themap, path, buffer, len );
}
int main( int argc, char * argv[] )
{
spmembuffer_map_t * themap = spmembuffer_map_new();
spmemvfs_cb_t cb = { themap, load, save };
const char * path = "abc.db";
spmemvfs_init( &cb );
// load membuffer from file, put it into themap
{
char * buffer = NULL;
int len = 0;
buffer = read_buffer_from_file( path, &len );
spmembuffer_map_put( themap, path, buffer, len );
}
// open sqlite by sqlite3_open_v2
{
sqlite3 * dbHandle = NULL;
char errcode = sqlite3_open_v2( path, &dbHandle,
SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE, SPMEMVFS_NAME );
// do wahtever you want
......
}
// get membuffer from themap, save it to file
{
int len = 0;
char * buffer = (char*)spmembuffer_map_take( themap, path, &len );
save_buffer_to_file( path, buffer, len );
free( buffer );
}
spmembuffer_map_del( themap );
return 0;
}
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