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/*--------
* Module: lobj.c
*
* Description: This module contains routines related to manipulating
* large objects.
*
* Classes: none
*
* API functions: none
*
* Comments: See "readme.txt" for copyright and license information.
*--------
*/
#include "lobj.h"
#include "connection.h"
OID
odbc_lo_creat(ConnectionClass *conn, int mode)
{
LO_ARG argv[1];
Int4 retval, result_len;
argv[0].isint = 1;
argv[0].len = 4;
argv[0].u.integer = mode;
if (!CC_send_function(conn, "lo_creat", &retval, &result_len, 1, argv, 1))
return 0; /* invalid oid */
else
return (OID) retval;
}
int
odbc_lo_open(ConnectionClass *conn, int lobjId, int mode)
{
int fd;
int result_len;
LO_ARG argv[2];
argv[0].isint = 1;
argv[0].len = 4;
argv[0].u.integer = lobjId;
argv[1].isint = 1;
argv[1].len = 4;
argv[1].u.integer = mode;
if (!CC_send_function(conn, "lo_open", &fd, &result_len, 1, argv, 2))
return -1;
if (fd >= 0 && odbc_lo_lseek64(conn, fd, 0L, SEEK_SET) < 0)
return -1;
return fd;
}
int
odbc_lo_close(ConnectionClass *conn, int fd)
{
LO_ARG argv[1];
int retval,
result_len;
argv[0].isint = 1;
argv[0].len = 4;
argv[0].u.integer = fd;
if (!CC_send_function(conn, "lo_close", &retval, &result_len, 1, argv, 1))
return -1;
else
return retval;
}
Int4
odbc_lo_read(ConnectionClass *conn, int fd, char *buf, Int4 len)
{
LO_ARG argv[2];
Int4 result_len;
argv[0].isint = 1;
argv[0].len = 4;
argv[0].u.integer = fd;
argv[1].isint = 1;
argv[1].len = 4;
argv[1].u.integer = len;
if (!CC_send_function(conn, "loread", (int *) buf, &result_len, 0, argv, 2))
return -1;
else
return result_len;
}
Int4
odbc_lo_write(ConnectionClass *conn, int fd, char *buf, Int4 len)
{
LO_ARG argv[2];
Int4 retval,
result_len;
if (len <= 0)
return 0;
argv[0].isint = 1;
argv[0].len = 4;
argv[0].u.integer = fd;
argv[1].isint = 0;
argv[1].len = len;
argv[1].u.ptr = (char *) buf;
if (!CC_send_function(conn, "lowrite", &retval, &result_len, 1, argv, 2))
return -1;
else
return retval;
}
Int4
odbc_lo_lseek(ConnectionClass *conn, int fd, int offset, Int4 whence)
{
LO_ARG argv[3];
Int4 retval,
result_len;
argv[0].isint = 1;
argv[0].len = 4;
argv[0].u.integer = fd;
argv[1].isint = 1;
argv[1].len = 4;
argv[1].u.integer = offset;
argv[2].isint = 1;
argv[2].len = 4;
argv[2].u.integer = whence;
/* We use lo_lseek64 */
if (!CC_send_function(conn, "lo_lseek", &retval, &result_len, 1, argv, 3))
return -1;
else
return retval;
}
Int4
odbc_lo_tell(ConnectionClass *conn, int fd)
{
LO_ARG argv[1];
Int4 retval, result_len;
argv[0].isint = 1;
argv[0].len = 4;
argv[0].u.integer = fd;
/* We use lo_tell64 */
if (!CC_send_function(conn, "lo_tell", &retval, &result_len, 1, argv, 1))
return -1;
else
return retval;
}
Int8
odbc_lo_lseek64(ConnectionClass *conn, int fd, Int8 offset, Int4 whence)
{
LO_ARG argv[3];
Int8 retval;
Int4 result_len;
if (PG_VERSION_LT(conn, 9.3))
{
Int4 offset32;
offset32 = (Int4) offset;
if (offset != (Int8) offset32)
{
CC_set_error(conn, CONN_VALUE_OUT_OF_RANGE, "large object lseek64 is unavailable for the server", __FUNCTION__);
return -1;
}
return (Int8) odbc_lo_lseek(conn, fd, offset32, whence);
}
argv[0].isint = 1;
argv[0].len = 4;
argv[0].u.integer = fd;
argv[1].isint = 2;
argv[1].len = sizeof(offset);
argv[1].u.integer64 = offset;
argv[2].isint = 1;
argv[2].len = 4;
argv[2].u.integer = whence;
if (!CC_send_function(conn, "lo_lseek64", &retval, &result_len, 2, argv, 3))
return -1;
else
return retval;
}
Int8
odbc_lo_tell64(ConnectionClass *conn, int fd)
{
LO_ARG argv[1];
Int8 retval;
Int4 result_len;
if (PG_VERSION_LT(conn, 9.3))
return (Int8) odbc_lo_tell(conn, fd);
argv[0].isint = 1;
argv[0].len = 4;
argv[0].u.integer = fd;
if (!CC_send_function(conn, "lo_tell64", &retval, &result_len, 2, argv, 1))
return -1;
else
return retval;
}
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