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MDEV-16280 Add class Bit_addr

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This commit is contained in:
Alexander Barkov
2018-05-24 09:31:36 +04:00
parent d3ff133390
commit dc5802255d
7 changed files with 188 additions and 155 deletions
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65
sql/sql_type.h
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@ -886,28 +886,67 @@ public:
};
class Bit_addr
{
/**
Byte where the bit is stored inside a record.
If the corresponding Field is a NOT NULL field, this member is NULL.
*/
uchar *m_ptr;
/**
Offset of the bit inside m_ptr[0], in the range 0..7.
*/
uchar m_offs;
public:
Bit_addr()
:m_ptr(NULL),
m_offs(0)
{ }
Bit_addr(uchar *ptr, uchar offs)
:m_ptr(ptr), m_offs(offs)
{
DBUG_ASSERT(ptr || offs == 0);
DBUG_ASSERT(offs < 8);
}
Bit_addr(bool maybe_null)
:m_ptr(maybe_null ? (uchar *) "" : NULL),
m_offs(0)
{ }
uchar *ptr() const { return m_ptr; }
uchar offs() const { return m_offs; }
uchar bit() const { return m_ptr ? ((uchar) 1) << m_offs : 0; }
void inc()
{
DBUG_ASSERT(m_ptr);
m_ptr+= (m_offs == 7);
m_offs= (m_offs + 1) & 7;
}
};
class Record_addr
{
uchar *m_ptr; // Position of the field in the record
Bit_addr m_null; // Position and offset of the null bit
public:
uchar *ptr; // Position to field in record
/**
Byte where the @c NULL bit is stored inside a record. If this Field is a
@c NOT @c NULL field, this member is @c NULL.
*/
uchar *null_ptr;
uchar null_bit; // Bit used to test null bit
Record_addr(uchar *ptr_arg,
uchar *null_ptr_arg,
uchar null_bit_arg)
:ptr(ptr_arg),
null_ptr(null_ptr_arg),
null_bit(null_bit_arg)
:m_ptr(ptr_arg),
m_null(null_ptr_arg, null_bit_arg)
{ }
Record_addr(uchar *ptr, const Bit_addr &null)
:m_ptr(ptr),
m_null(null)
{ }
Record_addr(bool maybe_null)
:ptr(NULL),
null_ptr(maybe_null ? (uchar*) "" : 0),
null_bit(0)
:m_ptr(NULL),
m_null(maybe_null)
{ }
uchar *ptr() const { return m_ptr; }
const Bit_addr &null() const { return m_null; }
uchar *null_ptr() const { return m_null.ptr(); }
uchar null_bit() const { return m_null.bit(); }
};