122 lines
2.8 KiB
C
122 lines
2.8 KiB
C
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/* Copyright (C) 2000-2003 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#include <my_global.h>
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#include <mysql_com.h>
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#include <mysql.h>
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/* Get the length of next field. Change parameter to point at fieldstart */
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ulong STDCALL net_field_length(uchar **packet)
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{
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reg1 uchar *pos= (uchar *)*packet;
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if (*pos < 251)
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{
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(*packet)++;
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return (ulong) *pos;
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}
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if (*pos == 251)
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{
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(*packet)++;
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return NULL_LENGTH;
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}
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if (*pos == 252)
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{
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(*packet)+=3;
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return (ulong) uint2korr(pos+1);
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}
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if (*pos == 253)
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{
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(*packet)+=4;
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return (ulong) uint3korr(pos+1);
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}
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(*packet)+=9; /* Must be 254 when here */
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return (ulong) uint4korr(pos+1);
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}
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/* The same as above but returns longlong */
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my_ulonglong net_field_length_ll(uchar **packet)
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{
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reg1 uchar *pos= *packet;
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if (*pos < 251)
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{
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(*packet)++;
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return (my_ulonglong) *pos;
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}
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if (*pos == 251)
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{
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(*packet)++;
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return (my_ulonglong) NULL_LENGTH;
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}
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if (*pos == 252)
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{
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(*packet)+=3;
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return (my_ulonglong) uint2korr(pos+1);
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}
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if (*pos == 253)
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{
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(*packet)+=4;
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return (my_ulonglong) uint3korr(pos+1);
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}
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(*packet)+=9; /* Must be 254 when here */
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#ifdef NO_CLIENT_LONGLONG
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return (my_ulonglong) uint4korr(pos+1);
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#else
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return (my_ulonglong) uint8korr(pos+1);
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#endif
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}
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/*
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Store an integer with simple packing into a output package
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SYNOPSIS
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net_store_length()
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pkg Store the packed integer here
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length integers to store
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NOTES
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This is mostly used to store lengths of strings.
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We have to cast the result for the LL() becasue of a bug in Forte CC
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compiler.
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RETURN
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Position in 'pkg' after the packed length
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*/
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uchar *net_store_length(uchar *packet, ulonglong length)
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{
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if (length < (ulonglong) LL(251))
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{
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*packet=(uchar) length;
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return packet+1;
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}
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/* 251 is reserved for NULL */
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if (length < (ulonglong) LL(65536))
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{
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*packet++=252;
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int2store(packet,(uint) length);
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return packet+2;
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}
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if (length < (ulonglong) LL(16777216))
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{
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*packet++=253;
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int3store(packet,(ulong) length);
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return packet+3;
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}
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*packet++=254;
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int8store(packet,length);
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return packet+8;
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}
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