mirror of
https://github.com/MariaDB/server.git
synced 2025-01-16 03:52:35 +01:00
8ad1e26b1b
- Moving get_canonical_filename() from a public function to a method in handler. - Adding a helper method is_canonical_filename() to handler. - Adding helper methods left(), substr(), starts_with() to Lex_cstring. - Adding helper methods is_sane(), buffer_overlaps(), max_data_size() to CharBuffer. - Adding append_casedn() to CharBuffer. It implements the main functionality that replaces the being removed my_casedn_str() call. - Adding a class Table_path_buffer, a descendant of CharBuffer with size FN_REFLEN. - Changing get_canonical_filename() to get a pointer to Table_path_buffer instead just a pointer to char. - Changing the data type of the "path" parameter and the return type of get_canonical_filename() from char* to Lex_cstring.
103 lines
3.1 KiB
C++
103 lines
3.1 KiB
C++
#ifndef CHAR_BUFFER_INCLUDED
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#define CHAR_BUFFER_INCLUDED
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/*
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Copyright (c) 2023, MariaDB
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; version 2 of
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the License.
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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 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 02110-1335 USA
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*/
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/*
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A string buffer with length.
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This template class is useful to store things like database, table names,
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whose maximum length a small fixed known value. Mainly to be used as
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stack variables to store temporary values.
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Can store exact string copies or casefolded string copies.
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The stored value is returned as a LEX_CSTRING.
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*/
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template<size_t buff_sz>
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class CharBuffer
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{
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char m_buff[buff_sz + 1 /* one extra byte for '\0' */];
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size_t m_length;
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bool is_sane() const
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{
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return m_length <= buff_sz; // One byte is still left for '\0'
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}
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bool buffer_overlaps(const LEX_CSTRING &str) const
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{
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return str.str + str.length >= m_buff && str.str <= m_buff + sizeof(m_buff);
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}
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public:
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constexpr size_t max_data_size() const
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{
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return buff_sz; // The maximum data size, without the trailing '\0' byte.
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}
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CharBuffer()
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:m_length(0)
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{
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m_buff[0]= '\0';
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}
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CharBuffer<buff_sz> & copy_bin(const LEX_CSTRING &str)
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{
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DBUG_ASSERT(!buffer_overlaps(str));
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m_length= MY_MIN(buff_sz, str.length);
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memcpy(m_buff, str.str, m_length);
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m_buff[m_length]= '\0';
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return *this;
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}
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CharBuffer<buff_sz> & copy_casedn(CHARSET_INFO *cs, const LEX_CSTRING &str)
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{
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DBUG_ASSERT(!buffer_overlaps(str));
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m_length= cs->cset->casedn(cs, str.str, str.length, m_buff, buff_sz);
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/*
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casedn() never writes outsize of buff_sz (unless a bug in casedn()),
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so it's safe to write '\0' at the position m_length:
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*/
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DBUG_ASSERT(is_sane());
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m_buff[m_length]= '\0';
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return *this;
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}
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CharBuffer<buff_sz> & copy_casedn(CHARSET_INFO *cs, const LEX_CSTRING &str,
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bool casedn)
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{
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casedn ? copy_casedn(cs, str) : copy_bin(str);
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return *this;
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}
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// Append a string with casedn conversion
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CharBuffer<buff_sz> & append_casedn(CHARSET_INFO *cs, const LEX_CSTRING &str)
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{
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DBUG_ASSERT(is_sane());
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DBUG_ASSERT(!buffer_overlaps(str));
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size_t casedn_length= cs->casedn(str.str, str.length,
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m_buff + m_length, buff_sz - m_length);
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m_length+= casedn_length;
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DBUG_ASSERT(is_sane());
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m_buff[m_length]= '\0';
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return *this;
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}
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LEX_CSTRING to_lex_cstring() const
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{
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return LEX_CSTRING{m_buff, m_length};
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}
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const char *ptr() const { return m_buff; }
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size_t length() const { return m_length; }
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};
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#endif // CHAR_BUFFER_INCLUDED
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