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base64.c
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base64.c
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/****************
MySQL UDF
gcc -Wall -I/usr/local/include -shared -o base64.so -c base64.c
SELECT base64encode('data,binary,text,...');
SELECT base64decode('b64strings');
this code based on PHP's base64.c
term is below.
Murakami Takeshi
takeshi@softagency.co.jp
--- changelog
2001-06-18
* base64decode can handle LF,CR,'\'
-- takeshi@softagency.co.jp
2001-06-15
* init.
-- takeshi@softagency.co.jp
****************/
/*
+----------------------------------------------------------------------+
| PHP version 4.0 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2001 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 2.02 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available at through the world-wide-web at |
| http://www.php.net/license/2_02.txt. |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Author: Jim Winstead (jimw@php.net) |
+----------------------------------------------------------------------+
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <mysql/mysql.h>
static char base64_table[] =
{ 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/', '\0'
};
static char base64_pad = '=';
typedef unsigned char uchar;
#define is_base64char(c) ( ( (uchar)0x30 <= (uchar)(c) && (uchar)(c) <= (uchar)0x39 ) || \
( (uchar)0x41 <= (uchar)(c) && (uchar)(c) <= (uchar)0x5a ) || \
( (uchar)0x61 <= (uchar)(c) && (uchar)(c) <= (uchar)0x7a ) || \
( (uchar)0x2b == (uchar)(c) ) || \
( (uchar)0x2f == (uchar)(c) ) )
/*****************************/
my_bool
base64encode_init(UDF_INIT* initid, UDF_ARGS* args, char* message)
{
if (args->arg_count != 1)
{
strcpy(message,"Wrong arguments to base64encode; must be (str)");
return 1;
}
if ( args->arg_type[0] != STRING_RESULT ) {
args->arg_type[0] = STRING_RESULT;
}
return 0;
}
void
base64encode_deinit(UDF_INIT* initid)
{
if (initid->ptr)
free(initid->ptr);
}
char
*base64encode(UDF_INIT *initid, UDF_ARGS *args, char *result,
unsigned long *ret_length, char *is_null, char *error)
{
const unsigned char *current;
unsigned long i = 0;
unsigned long len;
/* *is_null=0; */
current = args->args[0];
len = args->lengths[0];
if (len <= 0 || args->arg_type[0] != STRING_RESULT )
{
*is_null=0;
*ret_length = 0;
return 0;
}
if (!args || !args->args[0])
{
*is_null=1;
*ret_length = 0;
return 0;
}
if ( len < 1) { len=1; }
if (!( result = (char*) malloc( sizeof(char) * ((len + 3 - len % 3) * 4 / 3 + 1) ) ) )
{
/* strmov(message,"Couldn't allocate memory in base64encode_init"); */
*is_null=1;
*error=1;
*ret_length = 0;
return 0;
}
if (initid->ptr) free(initid->ptr);
initid->ptr = result;
i=0;
while (len > 2)
{ /* keep going until we have less than 24 bits */
result[i++] = base64_table[current[0] >> 2];
result[i++] = base64_table[((current[0] & 0x03) << 4) + (current[1] >> 4)];
result[i++] = base64_table[((current[1] & 0x0f) << 2) + (current[2] >> 6)];
result[i++] = base64_table[current[2] & 0x3f];
current += 3;
len -= 3; /* we just handle 3 octets of data */
}
/* now deal with the tail end of things */
if (len != 0)
{
result[i++] = base64_table[current[0] >> 2];
if (len > 1) {
result[i++] = base64_table[((current[0] & 0x03) << 4) + (current[1] >> 4)];
result[i++] = base64_table[(current[1] & 0x0f) << 2];
result[i++] = base64_pad;
}
else {
result[i++] = base64_table[(current[0] & 0x03) << 4];
result[i++] = base64_pad;
result[i++] = base64_pad;
}
}
*ret_length = i;
result[i] = '\0';
return result;
}
/*****************************/
my_bool
base64decode_init(UDF_INIT* initid, UDF_ARGS* args, char* message)
{
if (args->arg_count != 1)
{
strcpy(message,"Wrong arguments to base64decode; must be (str)");
return 1;
}
if ( args->arg_type[0] != STRING_RESULT ) {
args->arg_type[0] = STRING_RESULT;
}
return 0;
}
void
base64decode_deinit(UDF_INIT* initid)
{
if (initid->ptr)
free(initid->ptr);
}
char
*base64decode(UDF_INIT *initid, UDF_ARGS *args, char *result,
unsigned long *ret_length, char *is_null, char *error)
{
const unsigned char *current;
unsigned long i, j, k, ch;
unsigned long len;
static short reverse_table[256];
static int table_built;
if (++table_built == 1) {
char *chp;
for(ch = 0; ch < 256; ch++) {
chp = strchr(base64_table, ch);
if(chp) {
reverse_table[ch] = chp - base64_table;
} else {
reverse_table[ch] = -1;
}
}
}
current = args->args[0];
len = args->lengths[0];
if (len <= 0 || args->arg_type[0] != STRING_RESULT )
{
*is_null=0;
*ret_length = 0;
return 0;
}
if (!args || !args->args[0])
{
*is_null=1;
*ret_length = 0;
return 0;
}
if ( len < 1) { len=1; }
if (!( result = (char*) malloc( sizeof(char) * (len + 1) ) ) )
{
*is_null=1;
*error=1;
*ret_length = 0;
return 0;
}
if (initid->ptr) free(initid->ptr);
initid->ptr = result;
i=0; j=0;
while ((ch = *current) != '\0')
{
current++;
if (ch == base64_pad) break;
if ( ! is_base64char(ch) ) { continue; }
if ( ch == 0x5c )
{
if ( *current != '\0' ) {
current++;
continue;
}
else {
break;
}
}
if (ch == ' ') ch = '+';
ch = reverse_table[ch];
if (ch < 0) continue;
switch(i % 4)
{
case 0:
result[j] = ch << 2;
break;
case 1:
result[j++] |= ch >> 4;
result[j] = (ch & 0x0f) << 4;
break;
case 2:
result[j++] |= ch >>2;
result[j] = (ch & 0x03) << 6;
break;
case 3:
result[j++] |= ch;
break;
}
i++;
}
k = j;
/* mop things up if we ended on a boundary */
if (ch == base64_pad)
{
switch(i % 4)
{
case 0:
case 1:
*is_null=1;
*error=1;
*ret_length = 0;
return 0;
case 2:
k++;
case 3:
result[k++] = 0;
}
}
*ret_length = j;
result[k] = '\0';
return result;
}