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);
}
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] */
}
}
}
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);
}
/*
* __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);
}
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);
}
/*
* __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);
}
