示例#1
0
int
pack_ops(WT_SESSION *session)
{
	int ret;

	{
	/*! [Get the packed size] */
	size_t size;
	ret = wiredtiger_struct_size(session, &size, "iSh", 42, "hello", -3);
	/*! [Get the packed size] */
	assert(size < 100);
	}

	{
	/*! [Pack fields into a buffer] */
	char buf[100];
	ret = wiredtiger_struct_pack(
	    session, buf, sizeof(buf), "iSh", 42, "hello", -3);
	/*! [Pack fields into a buffer] */

	{
	/*! [Unpack fields from a buffer] */
	int i;
	char *s;
	short h;
	ret = wiredtiger_struct_unpack(
	    session, buf, sizeof(buf), "iSh", &i, &s, &h);
	/*! [Unpack fields from a buffer] */
	}
	}

	return (ret);
}
示例#2
0
文件: ex_all.c 项目: ajdavis/mongo
static void
pack_ops(WT_SESSION *session)
{
	{
	/*! [Get the packed size] */
	size_t size;
	error_check(wiredtiger_struct_size(
	    session, &size, "iSh", 42, "hello", -3));
	/*! [Get the packed size] */
	}

	{
	/*! [Pack fields into a buffer] */
	char buf[100];
	error_check(wiredtiger_struct_pack(
	    session, buf, sizeof(buf), "iSh", 42, "hello", -3));
	/*! [Pack fields into a buffer] */

	{
	/*! [Unpack fields from a buffer] */
	int i;
	char *s;
	short h;
	error_check(wiredtiger_struct_unpack(
	    session, buf, sizeof(buf), "iSh", &i, &s, &h));
	/*! [Unpack fields from a buffer] */
	}
	}
}
示例#3
0
int
main(void)
{
	WT_CONNECTION *conn;
	WT_SESSION *session;
	int i, j, k, ret;

	/*
	 * Create a clean test directory for this run of the test program if the
	 * environment variable isn't already set (as is done by make check).
	 */
	if (getenv("WIREDTIGER_HOME") == NULL) {
		home = "WT_HOME";
		ret = system("rm -rf WT_HOME && mkdir WT_HOME");
	} else
		home = NULL;

	/* Open a connection to the database, creating it if necessary. */
	if ((ret = wiredtiger_open(home, NULL, "create", &conn)) != 0) {
		fprintf(stderr, "Error connecting to %s: %s\n",
		    home == NULL ? "." : home, wiredtiger_strerror(ret));
		return (EXIT_FAILURE);
	}

	/* Open a session for the current thread's work. */
	if ((ret = conn->open_session(conn, NULL, NULL, &session)) != 0) {
		fprintf(stderr, "Error opening a session on %s: %s\n",
		    home == NULL ? "." : home, wiredtiger_strerror(ret));
		return (EXIT_FAILURE);
	}

	{
	/*! [packing] */
	size_t size;
	char buf[50];

	ret = wiredtiger_struct_size(session, &size, "iii", 42, 1000, -9);
	if (size > sizeof(buf)) {
		/* Allocate a bigger buffer. */
	}

	ret = wiredtiger_struct_pack(session, buf, size, "iii", 42, 1000, -9);

	ret = wiredtiger_struct_unpack(session, buf, size, "iii", &i, &j, &k);
	/*! [packing] */
	}

	/* Note: closing the connection implicitly closes open session(s). */
	if ((ret = conn->close(conn, NULL)) != 0) {
		fprintf(stderr, "Error closing %s: %s\n",
		    home == NULL ? "." : home, wiredtiger_strerror(ret));
		return (EXIT_FAILURE);
	}

	return (EXIT_SUCCESS);
}
示例#4
0
文件: cur_join.c 项目: mongodb/mongo
/*
 * __curjoin_pack_recno --
 *	Pack the given recno into a buffer; prepare an item referencing it.
 *
 */
static int
__curjoin_pack_recno(WT_SESSION_IMPL *session, uint64_t r, uint8_t *buf,
    size_t bufsize, WT_ITEM *item)
{
	WT_SESSION *wtsession;
	size_t sz;

	wtsession = (WT_SESSION *)session;
	WT_RET(wiredtiger_struct_size(wtsession, &sz, "r", r));
	WT_ASSERT(session, sz < bufsize);
	WT_RET(wiredtiger_struct_pack(wtsession, buf, bufsize, "r", r));
	item->size = sz;
	item->data = buf;
	return (0);
}
示例#5
0
int main(void)
{
	WT_CONNECTION *conn;
	WT_SESSION *session;
	char buf[50];
	size_t size;
	int i, j, k, ret;

	/* Open a connection to the database, creating it if necessary. */
	if ((ret = wiredtiger_open(home, NULL, "create", &conn)) != 0)
		fprintf(stderr, "Error connecting to %s: %s\n",
		    home, wiredtiger_strerror(ret));

	/* Open a session for the current thread's work. */
	if ((ret = conn->open_session(conn, NULL, NULL, &session)) != 0)
		fprintf(stderr, "Error opening a session on %s: %s\n",
		    home, wiredtiger_strerror(ret));

	/*! [packing] */
	ret = wiredtiger_struct_size(session, &size, "iii", 42, 1000, -9);
	if (size > sizeof(buf)) {
		/* Allocate a bigger buffer. */
	}

	ret = wiredtiger_struct_pack(session, buf, size, "iii", 42, 1000, -9);

	ret = wiredtiger_struct_unpack(session, buf, size, "iii", &i, &j, &k);
	/*! [packing] */

	/* Note: closing the connection implicitly closes open session(s). */
	if ((ret = conn->close(conn, NULL)) != 0)
		fprintf(stderr, "Error connecting to %s: %s\n",
		    home, wiredtiger_strerror(ret));

	return (ret);
}
示例#6
0
/*
 * __curlog_kv --
 *	Set the key and value of the log cursor to return to the user.
 */
static int
__curlog_kv(WT_SESSION_IMPL *session, WT_CURSOR *cursor)
{
	WT_CURSOR_LOG *cl;
	WT_ITEM item;
	uint32_t fileid, key_count, opsize, optype;

	cl = (WT_CURSOR_LOG *)cursor;
	/*
	 * If it is a commit and we have stepped over the header, peek to get
	 * the size and optype and read out any key/value from this operation.
	 */
	if ((key_count = cl->step_count++) > 0) {
		WT_RET(__wt_logop_read(session,
		    &cl->stepp, cl->stepp_end, &optype, &opsize));
		WT_RET(__curlog_op_read(session, cl, optype, opsize, &fileid));
		/* Position on the beginning of the next record part. */
		cl->stepp += opsize;
	} else {
		optype = WT_LOGOP_INVALID;
		fileid = 0;
		cl->opkey->data = NULL;
		cl->opkey->size = 0;
		/*
		 * Non-commit records we want to return the record without the
		 * header and the adjusted size.  Add one to skip over the type
		 * which is normally consumed by __wt_logrec_read.
		 */
		cl->opvalue->data = WT_LOG_SKIP_HEADER(cl->logrec->data) + 1;
		cl->opvalue->size = WT_LOG_REC_SIZE(cl->logrec->size) - 1;
	}
	/*
	 * The log cursor sets the LSN and step count as the cursor key and
	 * and log record related data in the value.  The data in the value
	 * contains any operation key/value that was in the log record.
	 * For the special case that the caller needs the result in raw form,
	 * we create packed versions of the key/value.
	 */
	if (FLD_ISSET(cursor->flags, WT_CURSTD_RAW)) {
		memset(&item, 0, sizeof(item));
		WT_RET(wiredtiger_struct_size((WT_SESSION *)session,
		    &item.size, WT_LOGC_KEY_FORMAT, cl->cur_lsn->l.file,
		    cl->cur_lsn->l.offset, key_count));
		WT_RET(__wt_realloc(session, NULL, item.size, &cl->packed_key));
		item.data = cl->packed_key;
		WT_RET(wiredtiger_struct_pack((WT_SESSION *)session,
		    cl->packed_key, item.size, WT_LOGC_KEY_FORMAT,
		    cl->cur_lsn->l.file, cl->cur_lsn->l.offset, key_count));
		__wt_cursor_set_key(cursor, &item);

		WT_RET(wiredtiger_struct_size((WT_SESSION *)session,
		    &item.size, WT_LOGC_VALUE_FORMAT, cl->txnid, cl->rectype,
		    optype, fileid, cl->opkey, cl->opvalue));
		WT_RET(__wt_realloc(session, NULL, item.size,
		    &cl->packed_value));
		item.data = cl->packed_value;
		WT_RET(wiredtiger_struct_pack((WT_SESSION *)session,
		    cl->packed_value, item.size, WT_LOGC_VALUE_FORMAT,
		    cl->txnid, cl->rectype, optype, fileid, cl->opkey,
		    cl->opvalue));
		__wt_cursor_set_value(cursor, &item);
	} else {
		__wt_cursor_set_key(cursor, cl->cur_lsn->l.file,
		    cl->cur_lsn->l.offset, key_count);
		__wt_cursor_set_value(cursor, cl->txnid, cl->rectype, optype,
		    fileid, cl->opkey, cl->opvalue);
	}
	return (0);
}