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088e2395f1
The following type conversions was done: - Changed byte to uchar - Changed gptr to uchar* - Change my_string to char * - Change my_size_t to size_t - Change size_s to size_t Removed declaration of byte, gptr, my_string, my_size_t and size_s. Following function parameter changes was done: - All string functions in mysys/strings was changed to use size_t instead of uint for string lengths. - All read()/write() functions changed to use size_t (including vio). - All protocoll functions changed to use size_t instead of uint - Functions that used a pointer to a string length was changed to use size_t* - Changed malloc(), free() and related functions from using gptr to use void * as this requires fewer casts in the code and is more in line with how the standard functions work. - Added extra length argument to dirname_part() to return the length of the created string. - Changed (at least) following functions to take uchar* as argument: - db_dump() - my_net_write() - net_write_command() - net_store_data() - DBUG_DUMP() - decimal2bin() & bin2decimal() - Changed my_compress() and my_uncompress() to use size_t. Changed one argument to my_uncompress() from a pointer to a value as we only return one value (makes function easier to use). - Changed type of 'pack_data' argument to packfrm() to avoid casts. - Changed in readfrm() and writefrom(), ha_discover and handler::discover() the type for argument 'frmdata' to uchar** to avoid casts. - Changed most Field functions to use uchar* instead of char* (reduced a lot of casts). - Changed field->val_xxx(xxx, new_ptr) to take const pointers. Other changes: - Removed a lot of not needed casts - Added a few new cast required by other changes - Added some cast to my_multi_malloc() arguments for safety (as string lengths needs to be uint, not size_t). - Fixed all calls to hash-get-key functions to use size_t*. (Needed to be done explicitely as this conflict was often hided by casting the function to hash_get_key). - Changed some buffers to memory regions to uchar* to avoid casts. - Changed some string lengths from uint to size_t. - Changed field->ptr to be uchar* instead of char*. This allowed us to get rid of a lot of casts. - Some changes from true -> TRUE, false -> FALSE, unsigned char -> uchar - Include zlib.h in some files as we needed declaration of crc32() - Changed MY_FILE_ERROR to be (size_t) -1. - Changed many variables to hold the result of my_read() / my_write() to be size_t. This was needed to properly detect errors (which are returned as (size_t) -1). - Removed some very old VMS code - Changed packfrm()/unpackfrm() to not be depending on uint size (portability fix) - Removed windows specific code to restore cursor position as this causes slowdown on windows and we should not mix read() and pread() calls anyway as this is not thread safe. Updated function comment to reflect this. Changed function that depended on original behavior of my_pwrite() to itself restore the cursor position (one such case). - Added some missing checking of return value of malloc(). - Changed definition of MOD_PAD_CHAR_TO_FULL_LENGTH to avoid 'long' overflow. - Changed type of table_def::m_size from my_size_t to ulong to reflect that m_size is the number of elements in the array, not a string/memory length. - Moved THD::max_row_length() to table.cc (as it's not depending on THD). Inlined max_row_length_blob() into this function. - More function comments - Fixed some compiler warnings when compiled without partitions. - Removed setting of LEX_STRING() arguments in declaration (portability fix). - Some trivial indentation/variable name changes. - Some trivial code simplifications: - Replaced some calls to alloc_root + memcpy to use strmake_root()/strdup_root(). - Changed some calls from memdup() to strmake() (Safety fix) - Simpler loops in client-simple.c
280 lines
8.6 KiB
C++
280 lines
8.6 KiB
C++
/* Copyright 2007 MySQL AB. 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 as published by
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the Free Software Foundation; version 2 of 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#include "mysql_priv.h"
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#include "rpl_record.h"
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#include "slave.h" // Need to pull in slave_print_msg
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/**
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Pack a record of data for a table into a format suitable for
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transfer via the binary log.
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The format for a row in transfer with N fields is the following:
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ceil(N/8) null bytes:
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One null bit for every column *regardless of whether it can be
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null or not*. This simplifies the decoding. Observe that the
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number of null bits is equal to the number of set bits in the
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@c cols bitmap. The number of null bytes is the smallest number
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of bytes necessary to store the null bits.
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Padding bits are 1.
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N packets:
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Each field is stored in packed format.
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@param table Table describing the format of the record
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@param cols Bitmap with a set bit for each column that should
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be stored in the row
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@param row_data Pointer to memory where row will be written
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@param record Pointer to record that should be packed. It is
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assumed that the pointer refers to either @c
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record[0] or @c record[1], but no such check is
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made since the code does not rely on that.
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@return The number of bytes written at @c row_data.
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*/
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#if !defined(MYSQL_CLIENT)
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size_t
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pack_row(TABLE *table, MY_BITMAP const* cols,
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uchar *row_data, const uchar *record)
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{
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Field **p_field= table->field, *field;
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int const null_byte_count= (bitmap_bits_set(cols) + 7) / 8;
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uchar *pack_ptr = row_data + null_byte_count;
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uchar *null_ptr = row_data;
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my_ptrdiff_t const rec_offset= record - table->record[0];
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my_ptrdiff_t const def_offset= table->s->default_values - table->record[0];
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/*
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We write the null bits and the packed records using one pass
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through all the fields. The null bytes are written little-endian,
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i.e., the first fields are in the first byte.
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*/
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unsigned int null_bits= (1U << 8) - 1;
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// Mask to mask out the correct but among the null bits
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unsigned int null_mask= 1U;
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for ( ; (field= *p_field) ; p_field++)
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{
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DBUG_PRINT("debug", ("null_mask=%d; null_ptr=%p; row_data=%p; null_byte_count=%d",
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null_mask, null_ptr, row_data, null_byte_count));
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if (bitmap_is_set(cols, p_field - table->field))
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{
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my_ptrdiff_t offset;
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if (field->is_null(rec_offset))
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{
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offset= def_offset;
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null_bits |= null_mask;
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}
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else
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{
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offset= rec_offset;
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null_bits &= ~null_mask;
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/*
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We only store the data of the field if it is non-null
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*/
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pack_ptr= field->pack(pack_ptr, field->ptr + offset);
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}
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null_mask <<= 1;
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if ((null_mask & 0xFF) == 0)
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{
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DBUG_ASSERT(null_ptr < row_data + null_byte_count);
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null_mask = 1U;
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*null_ptr++ = null_bits;
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null_bits= (1U << 8) - 1;
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}
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}
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}
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/*
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Write the last (partial) byte, if there is one
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*/
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if ((null_mask & 0xFF) > 1)
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{
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DBUG_ASSERT(null_ptr < row_data + null_byte_count);
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*null_ptr++ = null_bits;
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}
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/*
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The null pointer should now point to the first byte of the
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packed data. If it doesn't, something is very wrong.
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*/
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DBUG_ASSERT(null_ptr == row_data + null_byte_count);
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return static_cast<size_t>(pack_ptr - row_data);
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}
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#endif
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/**
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Unpack a row into @c table->record[0].
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The function will always unpack into the @c table->record[0]
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record. This is because there are too many dependencies on where
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the various member functions of Field and subclasses expect to
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write.
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The row is assumed to only consist of the fields for which the
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bitset represented by @c arr and @c bits; the other parts of the
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record are left alone.
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At most @c colcnt columns are read: if the table is larger than
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that, the remaining fields are not filled in.
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@param rli Relay log info
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@param table Table to unpack into
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@param colcnt Number of columns to read from record
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@param row Packed row data
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@param cols Pointer to columns data to fill in
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@param row_end Pointer to variable that will hold the value of the
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one-after-end position for the row
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@param master_reclength
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Pointer to variable that will be set to the length of the
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record on the master side
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@param rw_set Pointer to bitmap that holds either the read_set or the
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write_set of the table
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@retval 0 No error
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@retval ER_NO_DEFAULT_FOR_FIELD
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Returned if one of the fields existing on the slave but not on the
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master does not have a default value (and isn't nullable)
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*/
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#if !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION)
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int
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unpack_row(RELAY_LOG_INFO const *rli,
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TABLE *table, uint const colcnt,
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uchar const *const row_data, MY_BITMAP const *cols,
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uchar const **const row_end, ulong *const master_reclength,
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MY_BITMAP* const rw_set, Log_event_type const event_type)
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{
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DBUG_ENTER("unpack_row");
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DBUG_ASSERT(row_data);
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size_t const master_null_byte_count= (bitmap_bits_set(cols) + 7) / 8;
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int error= 0;
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uchar const *null_ptr= row_data;
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uchar const *pack_ptr= row_data + master_null_byte_count;
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bitmap_clear_all(rw_set);
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empty_record(table);
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Field **const begin_ptr = table->field;
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Field **field_ptr;
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Field **const end_ptr= begin_ptr + colcnt;
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DBUG_ASSERT(null_ptr < row_data + master_null_byte_count);
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// Mask to mask out the correct bit among the null bits
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unsigned int null_mask= 1U;
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// The "current" null bits
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unsigned int null_bits= *null_ptr++;
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for (field_ptr= begin_ptr ; field_ptr < end_ptr ; ++field_ptr)
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{
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Field *const f= *field_ptr;
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/*
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No need to bother about columns that does not exist: they have
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gotten default values when being emptied above.
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*/
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if (bitmap_is_set(cols, field_ptr - begin_ptr))
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{
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if ((null_mask & 0xFF) == 0)
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{
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DBUG_ASSERT(null_ptr < row_data + master_null_byte_count);
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null_mask= 1U;
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null_bits= *null_ptr++;
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}
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DBUG_ASSERT(null_mask & 0xFF); // One of the 8 LSB should be set
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/* Field...::unpack() cannot return 0 */
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DBUG_ASSERT(pack_ptr != NULL);
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if ((null_bits & null_mask) && f->maybe_null())
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f->set_null();
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else
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{
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f->set_notnull();
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/*
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We only unpack the field if it was non-null
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*/
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pack_ptr= f->unpack(f->ptr, pack_ptr);
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}
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bitmap_set_bit(rw_set, f->field_index);
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null_mask <<= 1;
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}
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}
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/*
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We should now have read all the null bytes, otherwise something is
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really wrong.
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*/
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DBUG_ASSERT(null_ptr == row_data + master_null_byte_count);
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*row_end = pack_ptr;
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if (master_reclength)
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{
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if (*field_ptr)
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*master_reclength = (*field_ptr)->ptr - table->record[0];
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else
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*master_reclength = table->s->reclength;
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}
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/*
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Set properties for remaining columns, if there are any. We let the
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corresponding bit in the write_set be set, to write the value if
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it was not there already. We iterate over all remaining columns,
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even if there were an error, to get as many error messages as
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possible. We are still able to return a pointer to the next row,
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so redo that.
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This generation of error messages is only relevant when inserting
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new rows.
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*/
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for ( ; *field_ptr ; ++field_ptr)
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{
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uint32 const mask= NOT_NULL_FLAG | NO_DEFAULT_VALUE_FLAG;
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Field *const f= *field_ptr;
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if (event_type == WRITE_ROWS_EVENT &&
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((*field_ptr)->flags & mask) == mask)
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{
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slave_print_msg(ERROR_LEVEL, rli, ER_NO_DEFAULT_FOR_FIELD,
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"Field `%s` of table `%s`.`%s` "
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"has no default value and cannot be NULL",
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(*field_ptr)->field_name, table->s->db.str,
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table->s->table_name.str);
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error = ER_NO_DEFAULT_FOR_FIELD;
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}
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else
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f->set_default();
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}
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DBUG_RETURN(error);
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}
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#endif // HAVE_REPLICATION
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