Adding upstream version 1:10.5.12.upstream/1%10.5.12upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 97 insertions, 0 deletions

diff --git a/sql/mf_iocache.cc b/sql/mf_iocache.cc
new file mode 100644
index 00000000..877a49ed
--- /dev/null
+++ b/sql/mf_iocache.cc
@@ -0,0 +1,97 @@
+/* Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   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 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 02110-1335  USA */
+
+/**
+  @file
+
+  @details
+  Caching of files with only does (sequential) read or writes of fixed-
+  length records. A read isn't allowed to go over file-length. A read is ok
+  if it ends at file-length and next read can try to read after file-length
+  (and get a EOF-error).
+  Possibly use of asyncronic io.
+  macros for read and writes for faster io.
+  Used instead of FILE when reading or writing whole files.
+  This will make mf_rec_cache obsolete.
+  One can change info->pos_in_file to a higher value to skip bytes in file if
+  also info->read_pos is set to info->read_end.
+  If called through open_cached_file(), then the temporary file will
+  only be created if a write exeeds the file buffer or if one calls
+  flush_io_cache().  
+*/
+
+#include "mariadb.h"
+#include "sql_priv.h"
+#include "sql_class.h"                          // THD
+#ifdef HAVE_REPLICATION
+
+extern "C" {
+
+/**
+  Read buffered from the net.
+
+  @retval
+    1   if can't read requested characters
+  @retval
+    0   if record read
+*/
+
+
+int _my_b_net_read(IO_CACHE *info, uchar *Buffer, size_t)
+{
+  ulong read_length;
+  NET *net= &(current_thd)->net;
+  DBUG_ENTER("_my_b_net_read");
+
+  if (!info->end_of_file)
+    DBUG_RETURN(1);	/* because my_b_get (no _) takes 1 byte at a time */
+  read_length= my_net_read_packet(net, 0);
+  if (unlikely(read_length == packet_error))
+  {
+    info->error= -1;
+    DBUG_RETURN(1);
+  }
+  if (unlikely(read_length == 0))
+  {
+    info->end_of_file= 0;			/* End of file from client */
+    DBUG_RETURN(1);
+  }
+  /* to set up stuff for my_b_get (no _) */
+  info->read_end = (info->read_pos = (uchar*) net->read_pos) + read_length;
+  Buffer[0] = info->read_pos[0];		/* length is always 1 */
+
+  /*
+    info->request_pos is used by log_loaded_block() to know the size
+    of the current block.
+    info->pos_in_file is used by log_loaded_block() too.
+  */
+  info->pos_in_file+= read_length;
+  info->request_pos=info->read_pos;
+
+  info->read_pos++;
+
+  DBUG_RETURN(0);
+}
+
+} /* extern "C" */
+
+#elif defined(__WIN__)
+
+// Remove linker warning 4221 about empty file
+namespace { char dummy; };
+
+#endif /* HAVE_REPLICATION */
+
+