1300.4.3
by Stewart Smith
move HEX() and UNHEX() to hex_functions plugin. |
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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
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*
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1999.6.1
by kalebral at gmail
update Copyright strings to a more common format to help with creating the master debian copyright file |
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* Copyright (C) 2008 Sun Microsystems, Inc.
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1300.4.3
by Stewart Smith
move HEX() and UNHEX() to hex_functions plugin. |
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*
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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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*
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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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*
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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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "config.h" |
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#include <drizzled/util/convert.h> |
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#include "drizzled/internal/m_string.h" |
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#include <drizzled/plugin/function.h> |
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#include <drizzled/function/str/strfunc.h> |
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using namespace drizzled; |
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class HexFunction :public Item_str_func |
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{
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String tmp_value; |
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public: |
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HexFunction() :Item_str_func() {} |
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const char *func_name() const { return "hex"; } |
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String *val_str(String *); |
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void fix_length_and_dec() |
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{
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collation.set(default_charset()); |
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decimals=0; |
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max_length=args[0]->max_length*2*collation.collation->mbmaxlen; |
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}
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bool check_argument_count(int n) { return n == 1; } |
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};
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class UnHexFunction :public Item_str_func |
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{
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String tmp_value; |
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public: |
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UnHexFunction() :Item_str_func() |
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{
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/* there can be bad hex strings */
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maybe_null= 1; |
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}
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const char *func_name() const { return "unhex"; } |
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String *val_str(String *); |
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void fix_length_and_dec() |
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{
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collation.set(&my_charset_bin); |
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decimals=0; |
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max_length=(1+args[0]->max_length)/2; |
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}
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bool check_argument_count(int n) { return n == 1; } |
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};
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/**
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convert a hex digit into number.
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*/
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static int hexchar_to_int(char c) |
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{
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if (c <= '9' && c >= '0') |
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return c-'0'; |
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c|=32; |
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if (c <= 'f' && c >= 'a') |
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return c-'a'+10; |
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return -1; |
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}
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String *HexFunction::val_str(String *str) |
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{
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String *res; |
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assert(fixed == 1); |
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if (args[0]->result_type() != STRING_RESULT) |
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{
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uint64_t dec; |
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char ans[65],*ptr; |
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/* Return hex of unsigned int64_t value */
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if (args[0]->result_type() == REAL_RESULT || |
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args[0]->result_type() == DECIMAL_RESULT) |
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{
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double val= args[0]->val_real(); |
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if ((val <= (double) INT64_MIN) || |
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(val >= (double) (uint64_t) UINT64_MAX)) |
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dec= ~(int64_t) 0; |
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else
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dec= (uint64_t) (val + (val > 0 ? 0.5 : -0.5)); |
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}
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else
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dec= (uint64_t) args[0]->val_int(); |
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if ((null_value= args[0]->null_value)) |
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return 0; |
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ptr= internal::int64_t2str(dec,ans,16); |
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if (str->copy(ans,(uint32_t) (ptr-ans),default_charset())) |
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return &my_empty_string; // End of memory |
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return str; |
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}
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/* Convert given string to a hex string, character by character */
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res= args[0]->val_str(str); |
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if (!res || tmp_value.alloc(res->length()*2+1)) |
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{
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null_value=1; |
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return 0; |
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}
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null_value=0; |
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tmp_value.length(res->length()*2); |
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(void) drizzled_string_to_hex((char*) tmp_value.ptr(), res->ptr(), |
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res->length()); |
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return &tmp_value; |
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}
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/** Convert given hex string to a binary string. */
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String *UnHexFunction::val_str(String *str) |
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{
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const char *from, *end; |
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char *to; |
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String *res; |
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uint32_t length; |
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assert(fixed == 1); |
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res= args[0]->val_str(str); |
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if (!res || tmp_value.alloc(length= (1+res->length())/2)) |
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{
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null_value=1; |
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return 0; |
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}
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from= res->ptr(); |
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null_value= 0; |
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tmp_value.length(length); |
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to= (char*) tmp_value.ptr(); |
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if (res->length() % 2) |
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{
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int hex_char; |
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*to++= hex_char= hexchar_to_int(*from++); |
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if ((null_value= (hex_char == -1))) |
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return 0; |
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}
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for (end=res->ptr()+res->length(); from < end ; from+=2, to++) |
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{
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int hex_char; |
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*to= (hex_char= hexchar_to_int(from[0])) << 4; |
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if ((null_value= (hex_char == -1))) |
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return 0; |
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*to|= hex_char= hexchar_to_int(from[1]); |
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if ((null_value= (hex_char == -1))) |
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return 0; |
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}
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return &tmp_value; |
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}
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plugin::Create_function<HexFunction> *hex_function= NULL; |
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plugin::Create_function<UnHexFunction> *unhex_function= NULL; |
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1530.2.6
by Monty Taylor
Moved plugin::Context to module::Context. |
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static int initialize(drizzled::module::Context &context) |
1300.4.3
by Stewart Smith
move HEX() and UNHEX() to hex_functions plugin. |
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{
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hex_function= new plugin::Create_function<HexFunction>("hex"); |
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unhex_function= new plugin::Create_function<UnHexFunction>("unhex"); |
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1324.2.2
by Monty Taylor
Use the plugin::Context everywhere. |
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context.add(hex_function); |
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context.add(unhex_function); |
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1300.4.3
by Stewart Smith
move HEX() and UNHEX() to hex_functions plugin. |
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return 0; |
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}
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DRIZZLE_DECLARE_PLUGIN
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{
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DRIZZLE_VERSION_ID, |
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"hex_functions", |
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"1.0", |
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"Stewart Smith", |
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"Convert a string to HEX() or from UNHEX()", |
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PLUGIN_LICENSE_GPL, |
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initialize, /* Plugin Init */ |
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NULL, /* system variables */ |
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NULL /* config options */ |
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}
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DRIZZLE_DECLARE_PLUGIN_END; |