~drizzle-trunk/drizzle/development

/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-

 *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:

 *

 *  Copyright (C) 2008 Sun Microsystems, Inc.

 *

 *  This program is free software; you can redistribute it and/or modify

 *  it under the terms of the GNU General Public License as published by

 *  the Free Software Foundation; version 2 of the License.

 *

 *  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 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 <config.h>

#include <drizzled/error.h>

#include <drizzled/field.h>

#include <drizzled/item/hex_string.h>

#include <drizzled/item/string.h>

#include <drizzled/type/decimal.h>

#include <algorithm>

using namespace std;

namespace drizzled

{

static char _dig_vec_lower[] =

  "0123456789abcdefghijklmnopqrstuvwxyz";

inline uint32_t char_val(char X)

{

  return (uint32_t) (X >= '0' && X <= '9' ? X-'0' :

                 X >= 'A' && X <= 'Z' ? X-'A'+10 :

                 X-'a'+10);

}

Item_hex_string::Item_hex_string(const char *str, uint32_t str_length)

{

  max_length=(str_length+1)/2;

  char *ptr=(char*) memory::sql_alloc(max_length+1);

  if (!ptr)

    return;

  str_value.set(ptr,max_length,&my_charset_bin);

  char *end=ptr+max_length;

  if (max_length*2 != str_length)

    *ptr++=char_val(*str++);                    // Not even, assume 0 prefix

  while (ptr != end)

  {

    *ptr++= (char) (char_val(str[0])*16+char_val(str[1]));

    str+=2;

  }

  *ptr=0;                                       // Keep purify happy

  collation.set(&my_charset_bin, DERIVATION_COERCIBLE);

  fixed= 1;

  unsigned_flag= 1;

}

int64_t Item_hex_string::val_int()

{

  // following assert is redundant, because fixed=1 assigned in constructor

  assert(fixed == 1);

  char *end= (char*) str_value.ptr()+str_value.length(),

       *ptr= end - min(str_value.length(), sizeof(int64_t));

  uint64_t value=0;

  for (; ptr != end ; ptr++)

    value=(value << 8)+ (uint64_t) (unsigned char) *ptr;

  return (int64_t) value;

}

type::Decimal *Item_hex_string::val_decimal(type::Decimal *decimal_value)

{

  // following assert is redundant, because fixed=1 assigned in constructor

  assert(fixed == 1);

  uint64_t value= (uint64_t)val_int();

  int2_class_decimal(E_DEC_FATAL_ERROR, value, true, decimal_value);

  return (decimal_value);

}

int Item_hex_string::save_in_field(Field *field, bool)

{

  field->set_notnull();

  if (field->result_type() == STRING_RESULT)

    return field->store(str_value.ptr(), str_value.length(),

                        collation.collation);

  uint64_t nr;

  uint32_t length= str_value.length();

  if (length > 8)

  {

    nr= field->flags & UNSIGNED_FLAG ? UINT64_MAX : INT64_MAX;

    goto warn;

  }

  nr= (uint64_t) val_int();

  if ((length == 8) && !(field->flags & UNSIGNED_FLAG) && (nr > INT64_MAX))

  {

    nr= INT64_MAX;

    goto warn;

  }

  return field->store((int64_t) nr, true);  // Assume hex numbers are unsigned

warn:

  if (!field->store((int64_t) nr, true))

    field->set_warning(DRIZZLE_ERROR::WARN_LEVEL_WARN, ER_WARN_DATA_OUT_OF_RANGE,

                       1);

  return 1;

}

void Item_hex_string::print(String *str, enum_query_type)

{

  char *end= (char*) str_value.ptr() + str_value.length(),

       *ptr= end - min(str_value.length(), sizeof(int64_t));

  str->append("0x");

  for (; ptr != end ; ptr++)

  {

    str->append(_dig_vec_lower[((unsigned char) *ptr) >> 4]);

    str->append(_dig_vec_lower[((unsigned char) *ptr) & 0x0F]);

  }

}

bool Item_hex_string::eq(const Item *arg, bool binary_cmp) const

{

  if (arg->basic_const_item() && arg->type() == type())

  {

    if (binary_cmp)

      return !stringcmp(&str_value, &arg->str_value);

    return !sortcmp(&str_value, &arg->str_value, collation.collation);

  }

  return false;

}

Item *Item_hex_string::safe_charset_converter(const CHARSET_INFO * const tocs)

{

  Item_string *conv;

  String tmp, *str= val_str(&tmp);

  if (!(conv= new Item_string(str->ptr(), str->length(), tocs)))

    return NULL;

  conv->str_value.copy();

  conv->str_value.mark_as_const();

  return conv;

}

} /* namespace drizzled */