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Backport MySQL WL#2540 into MariaDB.

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Patch backported:

bzr diff
'-rrevid:alfranio.correia@oracle.com-20101121143257-se3vpqus73l4mum0
..revid:luis.soares@oracle.com-20101124111752-9b8260bd1qak87hr'
--old=lp:mysql-server --new=lp:mysql-server
This commit is contained in:
unknown
2011-05-03 14:01:11 +02:00
parent d02d52629d
commit 014b8e7f43
67 changed files with 3034 additions and 1243 deletions
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61
sql/rpl_utility.cc
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@ -14,6 +14,8 @@
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
#include "rpl_utility.h"
#ifndef MYSQL_CLIENT
#include "rpl_rli.h"
/*********************************************************************
@ -224,3 +226,62 @@ table_def::compatible_with(Relay_log_info const *rli_arg, TABLE *table)
return error;
}
#endif /* MYSQL_CLIENT */
/**
@param even_buf point to the buffer containing serialized event
@param event_len length of the event accounting possible checksum alg
@return TRUE if test fails
FALSE as success
*/
bool event_checksum_test(uchar *event_buf, ulong event_len, uint8 alg)
{
bool res= FALSE;
uint16 flags= 0; // to store in FD's buffer flags orig value
if (alg != BINLOG_CHECKSUM_ALG_OFF && alg != BINLOG_CHECKSUM_ALG_UNDEF)
{
ha_checksum incoming;
ha_checksum computed;
if (event_buf[EVENT_TYPE_OFFSET] == FORMAT_DESCRIPTION_EVENT)
{
#ifndef DBUG_OFF
int8 fd_alg= event_buf[event_len - BINLOG_CHECKSUM_LEN -
BINLOG_CHECKSUM_ALG_DESC_LEN];
#endif
/*
FD event is checksummed and therefore verified w/o the binlog-in-use flag
*/
flags= uint2korr(event_buf + FLAGS_OFFSET);
if (flags & LOG_EVENT_BINLOG_IN_USE_F)
event_buf[FLAGS_OFFSET] &= ~LOG_EVENT_BINLOG_IN_USE_F;
/*
The only algorithm currently is CRC32. Zero indicates
the binlog file is checksum-free *except* the FD-event.
*/
DBUG_ASSERT(fd_alg == BINLOG_CHECKSUM_ALG_CRC32 || fd_alg == 0);
DBUG_ASSERT(alg == BINLOG_CHECKSUM_ALG_CRC32);
/*
Complile time guard to watch over the max number of alg
*/
compile_time_assert(BINLOG_CHECKSUM_ALG_ENUM_END <= 0x80);
}
incoming= uint4korr(event_buf + event_len - BINLOG_CHECKSUM_LEN);
computed= my_checksum(0L, NULL, 0);
/* checksum the event content but the checksum part itself */
computed= my_checksum(computed, (const uchar*) event_buf,
event_len - BINLOG_CHECKSUM_LEN);
if (flags != 0)
{
/* restoring the orig value of flags of FD */
DBUG_ASSERT(event_buf[EVENT_TYPE_OFFSET] == FORMAT_DESCRIPTION_EVENT);
event_buf[FLAGS_OFFSET]= flags;
}
res= !(computed == incoming);
}
return DBUG_EVALUATE_IF("simulate_checksum_test_failure", TRUE, res);
}