size_t base64_decode_block(const char* code_in, const size_t length_in, char* plaintext_out, base64_decodestate* state_in){
const char* codechar = code_in;
char* plainchar = plaintext_out;
char fragment;
*plainchar = state_in->plainchar;
switch (state_in->step){
while (1){
case step_a:
do{
if (codechar == code_in+length_in){
state_in->step = step_a;
state_in->plainchar = *plainchar;
return plainchar - plaintext_out;
}
fragment = (char)base64_decode_value(*codechar++);
} while ((signed char)fragment < 0);
*plainchar = (fragment & 0x03f) << 2;
case step_b:
do{
if (codechar == code_in+length_in){
state_in->step = step_b;
state_in->plainchar = *plainchar;
return plainchar - plaintext_out;
}
fragment = (char)base64_decode_value(*codechar++);
} while ((signed char)fragment < 0);
*plainchar++ |= (fragment & 0x030) >> 4;
*plainchar = (fragment & 0x00f) << 4;
case step_c:
do{
if (codechar == code_in+length_in)
{
state_in->step = step_c;
state_in->plainchar = *plainchar;
return plainchar - plaintext_out;
}
fragment = (char)base64_decode_value(*codechar++);
} while ((signed char)fragment < 0);
*plainchar++ |= (fragment & 0x03c) >> 2;
*plainchar = (fragment & 0x003) << 6;
case step_d:
do{
if (codechar == code_in+length_in){
state_in->step = step_d;
state_in->plainchar = *plainchar;
return plainchar - plaintext_out;
}
fragment = (char)base64_decode_value(*codechar++);
} while ((signed char)fragment < 0);
*plainchar++ |= (fragment & 0x03f);
}
}
/* control should not reach here */
return plainchar - plaintext_out;
}
static HB_SIZE base64_decode_block( const char * code_in, const HB_SIZE length_in, char * pszPlainttextOut )
{
const char * codechar = code_in;
const char * code_end = code_in + length_in;
char * pszPlainchar = pszPlainttextOut;
signed char fragment;
for(;; )
{
do
{
if( codechar == code_end )
return pszPlainchar - pszPlainttextOut;
fragment = base64_decode_value( *codechar++ );
}
while( fragment < 0 );
*pszPlainchar = ( fragment & 0x03F ) << 2;
do
{
if( codechar == code_end )
return pszPlainchar - pszPlainttextOut;
fragment = base64_decode_value( *codechar++ );
}
while( fragment < 0 );
*pszPlainchar++ |= ( fragment & 0x030 ) >> 4;
*pszPlainchar = ( fragment & 0x00F ) << 4;
do
{
if( codechar == code_end )
return pszPlainchar - pszPlainttextOut;
fragment = base64_decode_value( *codechar++ );
}
while( fragment < 0 );
*pszPlainchar++ |= ( fragment & 0x03C ) >> 2;
*pszPlainchar = ( fragment & 0x003 ) << 6;
do
{
if( codechar == code_end )
return pszPlainchar - pszPlainttextOut;
fragment = base64_decode_value( *codechar++ );
}
while( fragment < 0 );
*pszPlainchar++ |= ( fragment & 0x03F );
}
}
static int
base64_decode_block(const char *in_base64, int in_len,
char *out_bin, int out_len,
struct base64_decodestate *state)
{
const char *in_pos = in_base64;
const char *in_end = in_base64 + in_len;
char *out_pos = out_bin;
char *out_end = out_bin + out_len;
int fragment;
*out_pos = state->result;
switch (state->step)
{
while (1)
{
case step_a:
do {
if (in_pos == in_end || out_pos >= out_end)
{
state->step = step_a;
state->result = *out_pos;
return out_pos - out_bin;
}
fragment = base64_decode_value(*in_pos++);
} while (fragment < 0);
*out_pos = (fragment & 0x03f) << 2;
case step_b:
do {
if (in_pos == in_end || out_pos >= out_end)
{
state->step = step_b;
state->result = *out_pos;
return out_pos - out_bin;
}
fragment = base64_decode_value(*in_pos++);
} while (fragment < 0);
*out_pos++ |= (fragment & 0x030) >> 4;
if (out_pos < out_end)
*out_pos = (fragment & 0x00f) << 4;
case step_c:
do {
if (in_pos == in_end || out_pos >= out_end)
{
state->step = step_c;
state->result = *out_pos;
return out_pos - out_bin;
}
fragment = base64_decode_value(*in_pos++);
} while (fragment < 0);
*out_pos++ |= (fragment & 0x03c) >> 2;
if (out_pos < out_end)
*out_pos = (fragment & 0x003) << 6;
case step_d:
do {
if (in_pos == in_end || out_pos >= out_end)
{
state->step = step_d;
state->result = *out_pos;
return out_pos - out_bin;
}
fragment = base64_decode_value(*in_pos++);
} while (fragment < 0);
*out_pos++ |= (fragment & 0x03f);
}
}
/* control should not reach here */
return out_pos - out_bin;
}
int decode(char value_in)
{
return base64_decode_value(value_in);
}
int Base64decoder::decode(char value_in)
{
return base64_decode_value(value_in);
}