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/* -*- 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/charset.h>
#include <drizzled/function/str/strfunc.h>
#include <drizzled/internal/m_string.h>
#include <drizzled/plugin/function.h>
#include <drizzled/util/convert.h>
using namespace drizzled;
class HexFunction :public Item_str_func
{
String tmp_value;
public:
HexFunction() :Item_str_func() {}
const char *func_name() const { return "hex"; }
String *val_str(String *);
void fix_length_and_dec()
{
collation.set(default_charset());
decimals=0;
max_length=args[0]->max_length*2*collation.collation->mbmaxlen;
}
bool check_argument_count(int n) { return n == 1; }
};
class UnHexFunction :public Item_str_func
{
String tmp_value;
public:
UnHexFunction() :Item_str_func()
{
/* there can be bad hex strings */
maybe_null= 1;
}
const char *func_name() const { return "unhex"; }
String *val_str(String *);
void fix_length_and_dec()
{
collation.set(&my_charset_bin);
decimals=0;
max_length=(1+args[0]->max_length)/2;
}
bool check_argument_count(int n) { return n == 1; }
};
/**
convert a hex digit into number.
*/
static int hexchar_to_int(char c)
{
if (c <= '9' && c >= '0')
return c-'0';
c|=32;
if (c <= 'f' && c >= 'a')
return c-'a'+10;
return -1;
}
String *HexFunction::val_str(String *str)
{
String *res;
assert(fixed == 1);
if (args[0]->result_type() != STRING_RESULT)
{
uint64_t dec;
char ans[65],*ptr;
/* Return hex of unsigned int64_t value */
if (args[0]->result_type() == REAL_RESULT ||
args[0]->result_type() == DECIMAL_RESULT)
{
double val= args[0]->val_real();
if ((val <= (double) INT64_MIN) ||
(val >= (double) (uint64_t) UINT64_MAX))
dec= ~(int64_t) 0;
else
dec= (uint64_t) (val + (val > 0 ? 0.5 : -0.5));
}
else
dec= (uint64_t) args[0]->val_int();
if ((null_value= args[0]->null_value))
return 0;
ptr= internal::int64_t2str(dec,ans,16);
str->copy(ans,(uint32_t) (ptr-ans),default_charset());
return str;
}
/* Convert given string to a hex string, character by character */
res= args[0]->val_str(str);
if (!res)
{
null_value=1;
return 0;
}
null_value=0;
tmp_value.alloc(res->length()*2+1);
tmp_value.length(res->length()*2);
(void) drizzled_string_to_hex((char*) tmp_value.ptr(), res->ptr(),
res->length());
return &tmp_value;
}
/** Convert given hex string to a binary string. */
String *UnHexFunction::val_str(String *str)
{
const char *from, *end;
char *to;
String *res;
uint32_t length;
assert(fixed == 1);
res= args[0]->val_str(str);
if (!res)
{
null_value=1;
return 0;
}
tmp_value.alloc(length= (1+res->length())/2);
from= res->ptr();
null_value= 0;
tmp_value.length(length);
to= (char*) tmp_value.ptr();
if (res->length() % 2)
{
int hex_char;
*to++= hex_char= hexchar_to_int(*from++);
if ((null_value= (hex_char == -1)))
return 0;
}
for (end=res->ptr()+res->length(); from < end ; from+=2, to++)
{
int hex_char;
*to= (hex_char= hexchar_to_int(from[0])) << 4;
if ((null_value= (hex_char == -1)))
return 0;
*to|= hex_char= hexchar_to_int(from[1]);
if ((null_value= (hex_char == -1)))
return 0;
}
return &tmp_value;
}
plugin::Create_function<HexFunction> *hex_function= NULL;
plugin::Create_function<UnHexFunction> *unhex_function= NULL;
static int initialize(drizzled::module::Context &context)
{
hex_function= new plugin::Create_function<HexFunction>("hex");
unhex_function= new plugin::Create_function<UnHexFunction>("unhex");
context.add(hex_function);
context.add(unhex_function);
return 0;
}
DRIZZLE_DECLARE_PLUGIN
{
DRIZZLE_VERSION_ID,
"hex_functions",
"1.0",
"Stewart Smith",
"Convert a string to HEX() or from UNHEX()",
PLUGIN_LICENSE_GPL,
initialize, /* Plugin Init */
NULL, /* depends */
NULL /* config options */
}
DRIZZLE_DECLARE_PLUGIN_END;
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