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126 lines
3.4 KiB
Text
126 lines
3.4 KiB
Text
/******************************************************
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MySQL interface for Innobase
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(C) 2001 Innobase Oy
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Created 1/23/2001 Heikki Tuuri
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*******************************************************/
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/***********************************************************************
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Stores a variable-length field (like VARCHAR) length to dest, in the
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MySQL format. No real var implemented in MySQL yet! */
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UNIV_INLINE
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byte*
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row_mysql_store_var_len(
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/*====================*/
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/* out: dest + 2 */
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byte* dest, /* in: where to store */
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ulint len __attribute__((unused))) /* in: length, must fit in two
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bytes */
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{
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ut_ad(len < 256 * 256);
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/*
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mach_write_to_2_little_endian(dest, len);
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return(dest + 2);
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*/
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return(dest); /* No real var implemented in MySQL yet! */
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}
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/***********************************************************************
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Reads a MySQL format variable-length field (like VARCHAR) length and
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returns pointer to the field data. No real var implemented in MySQL yet! */
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UNIV_INLINE
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byte*
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row_mysql_read_var_ref(
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/*===================*/
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/* out: field + 2 */
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ulint* len, /* out: variable-length field length; does not work
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yet! */
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byte* field) /* in: field */
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{
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/*
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*len = mach_read_from_2_little_endian(field);
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return(field + 2);
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*/
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UT_NOT_USED(len);
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return(field); /* No real var implemented in MySQL yet! */
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}
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/******************************************************************
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Stores a non-SQL-NULL field given in the MySQL format in the Innobase
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format. */
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UNIV_INLINE
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void
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row_mysql_store_col_in_innobase_format(
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/*===================================*/
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dfield_t* dfield, /* in/out: dfield */
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byte* buf, /* in/out: buffer for the converted
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value; this must be at least col_len
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long! */
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byte* mysql_data, /* in: MySQL column value, not
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SQL NULL; NOTE that dfield may also
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get a pointer to mysql_data,
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therefore do not discard this as long
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as dfield is used! */
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ulint col_len, /* in: MySQL column length */
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ulint type, /* in: data type */
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ulint is_unsigned) /* in: != 0 if unsigned integer type */
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{
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byte* ptr = mysql_data;
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if (type == DATA_INT) {
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/* Store integer data in Innobase in a big-endian format,
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sign bit negated */
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ptr = buf + col_len;
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for (;;) {
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ptr--;
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*ptr = *mysql_data;
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if (ptr == buf) {
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break;
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}
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mysql_data++;
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}
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if (!is_unsigned) {
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*ptr = (byte) (*ptr ^ 128);
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}
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} else if (type == DATA_VARCHAR || type == DATA_VARMYSQL
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|| type == DATA_BINARY) {
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/* Remove trailing spaces. */
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/* Handle UCS2 strings differently. As no new
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collations will be introduced in 4.1, we hardcode the
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charset-collation codes here. In 5.0, the logic will
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be based on mbminlen. */
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ulint cset = dtype_get_charset_coll(
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dtype_get_prtype(dfield_get_type(dfield)));
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ptr = row_mysql_read_var_ref(&col_len, mysql_data);
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if (cset == 35/*ucs2_general_ci*/
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|| cset == 90/*ucs2_bin*/
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|| (cset >= 128/*ucs2_unicode_ci*/
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&& cset <= 144/*ucs2_persian_ci*/)) {
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/* space=0x0020 */
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/* Trim "half-chars", just in case. */
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col_len &= ~1;
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while (col_len >= 2 && ptr[col_len - 2] == 0x00
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&& ptr[col_len - 1] == 0x20) {
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col_len -= 2;
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}
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} else {
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/* space=0x20 */
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while (col_len > 0 && ptr[col_len - 1] == 0x20) {
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col_len--;
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}
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}
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} else if (type == DATA_BLOB) {
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ptr = row_mysql_read_blob_ref(&col_len, mysql_data, col_len);
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}
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dfield_set_data(dfield, ptr, col_len);
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}
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