Botan::Base64_Decoder Class Reference

#include <filters.h>

Inheritance diagram for Botan::Base64_Decoder:

Public Member Functions
virtual bool	attachable ()
	Base64_Decoder (Decoder_Checking checking=NONE)
void	end_msg () override
std::string	name () const override
virtual void	start_msg ()
void	write (const uint8_t input[], size_t length) override

Protected Member Functions
virtual void	send (const uint8_t in[], size_t length)
void	send (std::span< const uint8_t > in)
void	send (std::span< const uint8_t > in, size_t length)
void	send (uint8_t in)

Detailed Description

This object represents a Base64 decoder.

Definition at line 523 of file filters.h.

Constructor & Destructor Documentation

Base64_Decoder()

Botan::Base64_Decoder::Base64_Decoder ( Decoder_Checking checking = NONE )

explicit

Create a base64 decoder.

Parameters

checking

the type of checking that shall be performed by the decoder

Definition at line 105 of file b64_filt.cpp.

: m_checking(c), m_in(64), m_out(48) {}

Member Function Documentation

attachable()

virtual bool Botan::Filter::attachable ( )

inlinevirtualinherited

Check whether this filter is an attachable filter.

Returns

true if this filter is attachable, false otherwise

Reimplemented in Botan::DataSink, and Botan::SecureQueue.

Definition at line 54 of file filter.h.

{ return true; }

end_msg()

void Botan::Base64_Decoder::end_msg ( )

overridevirtual

Finish up the current message

Reimplemented from Botan::Filter.

Definition at line 141 of file b64_filt.cpp.

                             {
   size_t consumed = 0;
   size_t written = base64_decode(
      m_out.data(), cast_uint8_ptr_to_char(m_in.data()), m_position, consumed, true, m_checking != FULL_CHECK);
 
   send(m_out, written);
 
   const bool not_full_bytes = consumed != m_position;
 
   m_position = 0;
 
   if(not_full_bytes) {
      throw Invalid_Argument("Base64_Decoder: Input not full bytes");
   }
}

References Botan::base64_decode(), Botan::cast_uint8_ptr_to_char(), Botan::FULL_CHECK, and Botan::Filter::send().

name()

std::string Botan::Base64_Decoder::name ( ) const

inlineoverridevirtual

Returns

descriptive name for this filter

Implements Botan::Filter.

Definition at line 525 of file filters.h.

{ return "Base64_Decoder"; }

send() [1/4]

void Botan::Filter::send ( const uint8_t in[], size_t length )

protectedvirtualinherited

Parameters

in	some input for the filter
length	the length of in

Definition at line 30 of file filter.cpp.

                                                      {
   if(length == 0) {
      return;
   }
 
   bool nothing_attached = true;
   for(size_t j = 0; j != total_ports(); ++j) {
      if(m_next[j] != nullptr) {
         if(!m_write_queue.empty()) {
            m_next[j]->write(m_write_queue.data(), m_write_queue.size());
         }
         m_next[j]->write(input, length);
         nothing_attached = false;
      }
   }
 
   if(nothing_attached) {
      m_write_queue += std::make_pair(input, length);
   } else {
      m_write_queue.clear();
   }
}

Referenced by Botan::Base64_Decoder::end_msg(), Botan::Base64_Encoder::end_msg(), Botan::Hex_Decoder::end_msg(), Botan::Hex_Encoder::end_msg(), operator=(), send(), Botan::Base64_Decoder::write(), Botan::Chain::write(), Botan::Fork::write(), and Botan::Hex_Decoder::write().

send() [2/4]

void Botan::Filter::send ( std::span< const uint8_t > in )

inlineprotectedinherited

Parameters

in	some input for the filter

Definition at line 78 of file filter.h.

{ send(in.data(), in.size()); }

References send().

Referenced by send().

send() [3/4]

void Botan::Filter::send ( std::span< const uint8_t > in, size_t length )

protectedinherited

Parameters

in	some input for the filter
length	the number of bytes of in to send

This previously took a std::vector, for which the length field (allowing using just a prefix of the vector) somewhat made sense. It makes less sense now that we are using a span here; you can just use first to get a prefix.

Definition at line 22 of file filter.cpp.

                                                          {
   BOTAN_ASSERT_NOMSG(length <= in.size());
   send(in.data(), length);
}

References BOTAN_ASSERT_NOMSG, and send().

send() [4/4]

void Botan::Filter::send ( uint8_t in )

inlineprotectedinherited

Parameters

in	some input for the filter

Definition at line 73 of file filter.h.

{ send(&in, 1); }

References send().

Referenced by send().

start_msg()

virtual void Botan::Filter::start_msg ( )

inlinevirtualinherited

Start a new message. Must be closed by end_msg() before another message can be started.

Definition at line 40 of file filter.h.

                               { /* default empty */
      }

write()

void Botan::Base64_Decoder::write ( const uint8_t input[], size_t length )

overridevirtual

Input a part of a message to the decoder.

Parameters

input	the message to input as a byte array
length	the length of the byte array input

Implements Botan::Filter.

Definition at line 110 of file b64_filt.cpp.

                                                               {
   while(length > 0) {
      size_t to_copy = std::min<size_t>(length, m_in.size() - m_position);
      if(to_copy == 0) {
         m_in.resize(m_in.size() * 2);
         m_out.resize(m_out.size() * 2);
      }
      copy_mem(&m_in[m_position], input, to_copy);
      m_position += to_copy;
 
      size_t consumed = 0;
      size_t written = base64_decode(
         m_out.data(), cast_uint8_ptr_to_char(m_in.data()), m_position, consumed, false, m_checking != FULL_CHECK);
 
      send(m_out, written);
 
      if(consumed != m_position) {
         copy_mem(m_in.data(), m_in.data() + consumed, m_position - consumed);
         m_position = m_position - consumed;
      } else {
         m_position = 0;
      }
 
      length -= to_copy;
      input += to_copy;
   }
}

References Botan::base64_decode(), Botan::cast_uint8_ptr_to_char(), Botan::copy_mem(), Botan::FULL_CHECK, and Botan::Filter::send().

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The documentation for this class was generated from the following files:

• src/lib/filters/filters.h
• src/lib/filters/b64_filt.cpp