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- /* Copyright (c) 2000, 2021, Oracle and/or its affiliates.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License, version 2.0,
- as published by the Free Software Foundation.
-
- This program is also distributed with certain software (including
- but not limited to OpenSSL) that is licensed under separate terms,
- as designated in a particular file or component or in included license
- documentation. The authors of MySQL hereby grant you an additional
- permission to link the program and your derivative works with the
- separately licensed software that they have included with MySQL.
-
- Without limiting anything contained in the foregoing, this file,
- which is part of C Driver for MySQL (Connector/C), is also subject to the
- Universal FOSS Exception, version 1.0, a copy of which can be found at
- http://oss.oracle.com/licenses/universal-foss-exception.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License, version 2.0, for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
-
- #include <my_global.h>
- #include <mysql_com.h>
- #include <mysql.h>
-
- /* Get the length of next field. Change parameter to point at fieldstart */
- ulong STDCALL net_field_length(uchar **packet)
- {
- uchar *pos= (uchar *)*packet;
- if (*pos < 251)
- {
- (*packet)++;
- return (ulong) *pos;
- }
- if (*pos == 251)
- {
- (*packet)++;
- return NULL_LENGTH;
- }
- if (*pos == 252)
- {
- (*packet)+=3;
- return (ulong) uint2korr(pos+1);
- }
- if (*pos == 253)
- {
- (*packet)+=4;
- return (ulong) uint3korr(pos+1);
- }
- (*packet)+=9; /* Must be 254 when here */
- return (ulong) uint4korr(pos+1);
- }
-
- /* The same as above but with max length check */
- ulong STDCALL net_field_length_checked(uchar **packet, ulong max_length)
- {
- ulong len;
- uchar *pos= (uchar *)*packet;
-
- if (*pos < 251)
- {
- (*packet)++;
- len= (ulong) *pos;
- return (len > max_length) ? max_length : len;
- }
- if (*pos == 251)
- {
- (*packet)++;
- return NULL_LENGTH;
- }
- if (*pos == 252)
- {
- (*packet)+=3;
- len= (ulong) uint2korr(pos+1);
- return (len > max_length) ? max_length : len;
- }
- if (*pos == 253)
- {
- (*packet)+=4;
- len= (ulong) uint3korr(pos+1);
- return (len > max_length) ? max_length : len;
- }
- (*packet)+=9; /* Must be 254 when here */
- len= (ulong) uint4korr(pos+1);
- return (len > max_length) ? max_length : len;
- }
-
- /* The same as above but returns longlong */
- my_ulonglong net_field_length_ll(uchar **packet)
- {
- uchar *pos= *packet;
- if (*pos < 251)
- {
- (*packet)++;
- return (my_ulonglong) *pos;
- }
- if (*pos == 251)
- {
- (*packet)++;
- return (my_ulonglong) NULL_LENGTH;
- }
- if (*pos == 252)
- {
- (*packet)+=3;
- return (my_ulonglong) uint2korr(pos+1);
- }
- if (*pos == 253)
- {
- (*packet)+=4;
- return (my_ulonglong) uint3korr(pos+1);
- }
- (*packet)+=9; /* Must be 254 when here */
- return (my_ulonglong) uint8korr(pos+1);
- }
-
- /*
- Store an integer with simple packing into a output package
-
- SYNOPSIS
- net_store_length()
- pkg Store the packed integer here
- length integers to store
-
- NOTES
- This is mostly used to store lengths of strings.
- We have to cast the result of the LL because of a bug in Forte CC
- compiler.
-
- RETURN
- Position in 'pkg' after the packed length
- */
-
- uchar *net_store_length(uchar *packet, ulonglong length)
- {
- if (length < (ulonglong) 251LL)
- {
- *packet=(uchar) length;
- return packet+1;
- }
- /* 251 is reserved for NULL */
- if (length < (ulonglong) 65536LL)
- {
- *packet++=252;
- int2store(packet,(uint) length);
- return packet+2;
- }
- if (length < (ulonglong) 16777216LL)
- {
- *packet++=253;
- int3store(packet,(ulong) length);
- return packet+3;
- }
- *packet++=254;
- int8store(packet,length);
- return packet+8;
- }
-
-
- /**
- The length of space required to store the resulting length-encoded integer
- for the given number. This function can be used at places where one needs to
- dynamically allocate the buffer for a given number to be stored as length-
- encoded integer.
-
- @param num [IN] the input number
-
- @return length of buffer needed to store this number [1, 3, 4, 9].
- */
-
- uint net_length_size(ulonglong num)
- {
- if (num < (ulonglong) 252LL)
- return 1;
- if (num < (ulonglong) 65536LL)
- return 3;
- if (num < (ulonglong) 16777216LL)
- return 4;
- return 9;
- }
-
- /**
- length of buffer required to represent a length-encoded string
- give the length part of length encoded string. This function can
- be used before calling net_field_lenth/net_field_length_ll.
-
- @param [in] pos Length information of length-encoded string
-
- @return length of buffer needed to store this number [1, 3, 4, 9].
- */
-
- uint net_field_length_size(const uchar *pos) {
- if (*pos <= 251) return 1;
- if (*pos == 252) return 3;
- if (*pos == 253) return 4;
- return 9;
- }
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