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93 lines
3.0 KiB
93 lines
3.0 KiB
5 months ago
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/* Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
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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, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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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, version 2.0, 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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/**
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@file
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@details
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Caching of files with only does (sequential) read or writes of fixed-
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length records. A read isn't allowed to go over file-length. A read is ok
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if it ends at file-length and next read can try to read after file-length
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(and get a EOF-error).
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Used instead of FILE when reading or writing whole files.
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One can change info->pos_in_file to a higher value to skip bytes in file if
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also info->rc_pos is set to info->rc_end.
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If called through open_cached_file(), then the temporary file will
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only be created if a write exeeds the file buffer or if one calls
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flush_io_cache().
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*/
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#include <stddef.h>
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#include <sys/types.h>
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#include "my_compiler.h"
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#include "my_dbug.h"
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#include "my_inttypes.h"
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#include "my_sys.h"
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#include "mysql_com.h"
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#include "sql/current_thd.h"
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#include "sql/protocol_classic.h"
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#include "sql/sql_class.h" // THD
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/**
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Read buffered from the net.
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@retval
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1 if can't read requested characters
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@retval
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0 if record read
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*/
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int _my_b_net_read(IO_CACHE *info, uchar *Buffer,
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size_t Count MY_ATTRIBUTE((unused))) {
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ulong read_length;
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NET *net = current_thd->get_protocol_classic()->get_net();
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DBUG_TRACE;
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if (!info->end_of_file)
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return 1; /* because my_b_get (no _) takes 1 byte at a time */
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read_length = my_net_read(net);
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if (read_length == packet_error) {
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info->error = -1;
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return 1;
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}
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if (read_length == 0) {
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info->end_of_file = 0; /* End of file from client */
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return 1;
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}
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/* to set up stuff for my_b_get (no _) */
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info->read_end = (info->read_pos = net->read_pos) + read_length;
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Buffer[0] = info->read_pos[0]; /* length is always 1 */
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/*
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info->request_pos is used by log_loaded_block() to know the size
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of the current block.
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info->pos_in_file is used by log_loaded_block() too.
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*/
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info->pos_in_file += read_length;
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info->request_pos = info->read_pos;
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info->read_pos++;
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return 0;
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}
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