You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
121 lines
4.4 KiB
121 lines
4.4 KiB
/* Copyright (c) 2013, 2019, 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, 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.
|
|
|
|
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 "unittest/gunit/skip_trailing.h"
|
|
|
|
#include "my_config.h"
|
|
|
|
#include "my_byteorder.h"
|
|
#include "my_dbug.h"
|
|
|
|
namespace skip_trailing_space_unittest {
|
|
|
|
/* SPACE_INT is a word that contains only spaces */
|
|
#if SIZEOF_INT == 4
|
|
static const unsigned SPACE_INT = 0x20202020U;
|
|
#elif SIZEOF_INT == 8
|
|
static const unsigned SPACE_INT = 0x2020202020202020ULL;
|
|
#else
|
|
#error define the appropriate constant for a word full of spaces
|
|
#endif
|
|
|
|
// A copy of the original version of skip_trailing_space
|
|
const uchar *skip_trailing_orig(const uchar *ptr, size_t len) {
|
|
const uchar *end = ptr + len;
|
|
|
|
if (len > 20) {
|
|
const uchar *end_words = (const uchar *)(intptr)(((ulonglong)(intptr)end) /
|
|
SIZEOF_INT * SIZEOF_INT);
|
|
const uchar *start_words = (const uchar *)(intptr)(
|
|
(((ulonglong)(intptr)ptr) + SIZEOF_INT - 1) / SIZEOF_INT * SIZEOF_INT);
|
|
|
|
DBUG_ASSERT(((ulonglong)(intptr)ptr) >= SIZEOF_INT);
|
|
if (end_words > ptr) {
|
|
while (end > end_words && end[-1] == 0x20) end--;
|
|
if (end[-1] == 0x20 && start_words < end_words)
|
|
while (end > start_words &&
|
|
(pointer_cast<const unsigned *>(end))[-1] == SPACE_INT)
|
|
end -= SIZEOF_INT;
|
|
}
|
|
}
|
|
while (end > ptr && end[-1] == 0x20) end--;
|
|
return (end);
|
|
}
|
|
|
|
// Read 8 bytes at a time, ignoring alignment.
|
|
// We use uint8korr which is fast on all platforms, except sparc.
|
|
const uchar *skip_trailing_unalgn(const uchar *ptr, size_t len) {
|
|
const uchar *end = ptr + len;
|
|
while (end - ptr >= 8) {
|
|
if (uint8korr(end - 8) != 0x2020202020202020ULL) break;
|
|
end -= 8;
|
|
}
|
|
while (end > ptr && end[-1] == 0x20) end--;
|
|
return (end);
|
|
}
|
|
|
|
// Same as the original, except we skip a test which is always true.
|
|
const uchar *skip_trailing_4byte(const uchar *ptr, size_t len) {
|
|
const uchar *end = ptr + len;
|
|
|
|
if (len > 20) {
|
|
const uchar *end_words = (const uchar *)(intptr)(((ulonglong)(intptr)end) /
|
|
SIZEOF_INT * SIZEOF_INT);
|
|
const uchar *start_words = (const uchar *)(intptr)(
|
|
(((ulonglong)(intptr)ptr) + SIZEOF_INT - 1) / SIZEOF_INT * SIZEOF_INT);
|
|
|
|
DBUG_ASSERT(end_words > ptr);
|
|
{
|
|
while (end > end_words && end[-1] == 0x20) end--;
|
|
if (end[-1] == 0x20 && start_words < end_words)
|
|
while (end > start_words &&
|
|
(pointer_cast<const unsigned *>(end))[-1] == SPACE_INT)
|
|
end -= SIZEOF_INT;
|
|
}
|
|
}
|
|
while (end > ptr && end[-1] == 0x20) end--;
|
|
return (end);
|
|
}
|
|
|
|
// Same as skip_trailing_4byte, except we read 8 bytes at a time (aligned).
|
|
const uchar *skip_trailing_8byte(const uchar *ptr, size_t len) {
|
|
const uchar *end = ptr + len;
|
|
|
|
if (len > 20) {
|
|
const uchar *end_words =
|
|
(const uchar *)(longlong)(((ulonglong)(longlong)end) / 8 * 8);
|
|
const uchar *start_words =
|
|
(const uchar *)(longlong)((((ulonglong)(longlong)ptr) + 8 - 1) / 8 * 8);
|
|
|
|
DBUG_ASSERT(end_words > ptr);
|
|
{
|
|
while (end > end_words && end[-1] == 0x20) end--;
|
|
if (end[-1] == 0x20 && start_words < end_words)
|
|
while (end > start_words && (pointer_cast<const ulonglong *>(
|
|
end))[-1] == 0x2020202020202020ULL)
|
|
end -= 8;
|
|
}
|
|
}
|
|
while (end > ptr && end[-1] == 0x20) end--;
|
|
return (end);
|
|
}
|
|
} // namespace skip_trailing_space_unittest
|
|
|