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// $Id$
#include "ace/OS.h"
#include "ace/Codecs.h"
#include "ace/Log_Msg.h"
const ACE_Byte ACE_Base64::alphabet_[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
const ACE_Byte ACE_Base64::pad_ = '=';
int ACE_Base64::init_ = 0;
int ACE_Base64::max_columns_ = 72;
ACE_Byte ACE_Base64::decoder_[256];
ACE_Byte ACE_Base64::member_[256];
ACE_Byte*
ACE_Base64::encode (const ACE_Byte* input,
const size_t input_len,
size_t* output_len)
{
if (!ACE_Base64::init_)
ACE_Base64::init();
if (!input)
return 0;
ACE_Byte* result = 0;
size_t length = ((input_len + 2) / 3) * 4;
size_t num_lines = length / ACE_Base64::max_columns_ + 1;
length += num_lines + 1;
ACE_NEW_RETURN (result, ACE_Byte[length], 0);
int char_count = 0;
int bits = 0;
size_t pos = 0;
int cols = 0;
for (size_t i = 0; i < input_len; ++i)
{
if (input[i] > 255) {
delete[] result;
return 0;
}
bits += input[i];
char_count++;
if (char_count == 3)
{
result[pos++] = ACE_Base64::alphabet_[bits >> 18];
result[pos++] = ACE_Base64::alphabet_[(bits >> 12) & 0x3f];
result[pos++] = ACE_Base64::alphabet_[(bits >> 6) & 0x3f];
result[pos++] = ACE_Base64::alphabet_[bits & 0x3f];
cols += 4;
if (cols == ACE_Base64::max_columns_) {
result[pos++] = '\n';
cols = 0;
}
bits = 0;
char_count = 0;
}
else
{
bits <<= 8;
}
}
if (char_count != 0)
{
bits <<= (16 - (8 * char_count));
result[pos++] = ACE_Base64::alphabet_[bits >> 18];
result[pos++] = ACE_Base64::alphabet_[(bits >> 12) & 0x3f];
if (char_count == 1)
{
result[pos++] = pad_;
result[pos++] = pad_;
}
else
{
result[pos++] = ACE_Base64::alphabet_[(bits >> 6) & 0x3f];
result[pos++] = pad_;
}
if (cols > 0)
result[pos++] = '\n';
}
result[pos] = 0;
*output_len = pos;
return result;
}
size_t
ACE_Base64::length (const ACE_Byte* input)
{
if (!ACE_Base64::init_)
ACE_Base64::init();
ACE_Byte* ptr = ACE_const_cast (ACE_Byte*, input);
while (*ptr != 0 &&
(member_[*(ptr)] == 1 || *ptr == pad_
|| ACE_OS_String::ace_isspace (*ptr)))
ptr++;
size_t len = ptr - input;
len = ((len + 3) / 4) * 3 + 1 ;
return len;
}
ACE_Byte*
ACE_Base64::decode (const ACE_Byte* input, size_t* output_len)
{
if (!ACE_Base64::init_)
ACE_Base64::init();
if (!input)
return 0;
size_t result_len = ACE_Base64::length (input);
ACE_Byte* result = 0;
ACE_NEW_RETURN (result, ACE_Byte[result_len], 0);
ACE_Byte* ptr = ACE_const_cast (ACE_Byte*, input);
while (*ptr != 0 &&
(member_[*(ptr)] == 1 || *ptr == pad_
|| ACE_OS_String::ace_isspace (*ptr)))
ptr++;
size_t input_len = ptr - input;
int char_count = 0;
int bits = 0;
size_t pos = 0;
size_t i = 0;
for (; i < input_len; ++i)
{
if (input[i] == pad_)
break;
if (input[i] > 255 || !ACE_Base64::member_[input[i]])
continue;
bits += decoder_[input[i]];
char_count++;
if (char_count == 4)
{
result[pos++] = bits >> 16;
result[pos++] = (bits >> 8) & 0xff;
result[pos++] = bits & 0xff;
bits = 0;
char_count = 0;
}
else
{
bits <<= 6;
}
}
int errors = 0;
if ( i == input_len)
{
if (char_count)
{
ACE_DEBUG ((LM_ERROR,
ACE_TEXT ("Decoding incomplete: atleast %d bits truncated\n"),
(4 - char_count) * 6));
errors++;
}
}
else
{
switch (char_count)
{
case 1:
ACE_DEBUG ((LM_ERROR,
ACE_TEXT ("Decoding incomplete: atleast 2 bits missing\n")));
errors++;
break;
case 2:
result[pos++] = bits >> 10;
break;
case 3:
result[pos++] = bits >> 16;
result[pos++] = (bits >> 8) & 0xff;
break;
}
}
if (errors)
{
delete[] result;
return 0;
}
result[pos] = 0;
*output_len = pos;
return result;
}
void
ACE_Base64::init ()
{
if (!ACE_Base64::init_)
{
for (ACE_Byte i = 0; i < sizeof (ACE_Base64::alphabet_); ++i)
{
ACE_Base64::decoder_[ACE_Base64::alphabet_[i]] = i;
ACE_Base64::member_[ACE_Base64::alphabet_[i]] = 1;
}
ACE_Base64::init_ = 1;
}
return;
}
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