Botan::Pipe Class Reference

#include <pipe.h>

Inheritance diagram for Botan::Pipe:

Classes
class	Invalid_Message_Number

Public Types
typedef size_t	message_id

Public Member Functions
void	append (Filter *filt)
void	append_filter (Filter *filt)
bool	check_available (size_t n) override
bool	check_available_msg (size_t n, message_id msg) const
size_t	default_msg () const
size_t	discard_next (size_t N)
void	end_msg ()
bool	end_of_data () const override
size_t	get_bytes_read () const override
size_t	get_bytes_read (message_id msg) const
virtual std::string	id () const
message_id	message_count () const
Pipe &	operator= (const Pipe &)=delete
size_t	peek (uint8_t &output, size_t offset, message_id msg=DEFAULT_MESSAGE) const
size_t	peek (uint8_t output[], size_t length, size_t offset) const override
size_t	peek (uint8_t output[], size_t length, size_t offset, message_id msg) const
size_t	peek_byte (uint8_t &out) const
	Pipe (const Pipe &)=delete
	Pipe (Filter *=nullptr, Filter *=nullptr, Filter *=nullptr, Filter *=nullptr)
	Pipe (std::initializer_list< Filter * > filters)
void	pop ()
void	prepend (Filter *filt)
void	prepend_filter (Filter *filt)
void	process_msg (const secure_vector< uint8_t > &in)
void	process_msg (const std::vector< uint8_t > &in)
void	process_msg (const uint8_t in[], size_t length)
void	process_msg (DataSource &in)
void	process_msg (std::string_view in)
size_t	read (uint8_t &output, message_id msg=DEFAULT_MESSAGE)
size_t	read (uint8_t output[], size_t length) override
size_t	read (uint8_t output[], size_t length, message_id msg)
secure_vector< uint8_t >	read_all (message_id msg=DEFAULT_MESSAGE)
std::string	read_all_as_string (message_id msg=DEFAULT_MESSAGE)
size_t	read_byte (uint8_t &out)
size_t	remaining (message_id msg=DEFAULT_MESSAGE) const
void	reset ()
void	set_default_msg (message_id msg)
void	start_msg ()
void	write (const secure_vector< uint8_t > &in)
void	write (const std::vector< uint8_t > &in)
void	write (const uint8_t in[], size_t length)
void	write (DataSource &in)
void	write (std::string_view in)
void	write (uint8_t in)
	~Pipe () override

Static Public Attributes
static const message_id	DEFAULT_MESSAGE = static_cast<Pipe::message_id>(-1)
static const message_id	LAST_MESSAGE = static_cast<Pipe::message_id>(-2)

Detailed Description

This class represents pipe objects. A set of filters can be placed into a pipe, and information flows through the pipe until it reaches the end, where the output is collected for retrieval. If you're familiar with the Unix shell environment, this design will sound quite familiar.

Definition at line 29 of file pipe.h.

Member Typedef Documentation

message_id

size_t Botan::Pipe::message_id

An opaque type that identifies a message in this Pipe

Definition at line 34 of file pipe.h.

Constructor & Destructor Documentation

Pipe() [1/3]

Botan::Pipe::Pipe	(	Filter *	f1 = nullptr,
		Filter *	f2 = nullptr,
		Filter *	f3 = nullptr,
		Filter *	f4 = nullptr )

Construct a Pipe of up to four filters. The filters are set up in the same order as the arguments.

Definition at line 38 of file pipe.cpp.

: Pipe({f1, f2, f3, f4}) {}

Pipe() [2/3]

Botan::Pipe::Pipe ( std::initializer_list< Filter * > filters )

explicit

Construct a Pipe from a list of filters

Parameters

filters

the set of filters to use

Definition at line 43 of file pipe.cpp.

                                            {
   m_outputs = std::make_unique<Output_Buffers>();
   m_pipe = nullptr;
   m_default_read = 0;
   m_inside_msg = false;
 
   for(auto arg : args) {
      do_append(arg);
   }
}

Pipe() [3/3]

Botan::Pipe::Pipe ( const Pipe & )

delete

~Pipe()

Botan::Pipe::~Pipe ( )

override

Definition at line 57 of file pipe.cpp.

            {
   destruct(m_pipe);
}

Member Function Documentation

append()

void Botan::Pipe::append

(

Filter *

filt

)

Insert a new filter at the back of the pipe Deprecated because runtime modification of Pipes is deprecated. You can instead use append_filter which only works before the first message is processed.

Parameters

filt	the new filter to insert

Definition at line 199 of file pipe.cpp.

                                {
   do_append(filter);
}

append_filter()

void Botan::Pipe::append_filter

(

Filter *

filt

)

Append a new filter onto the filter sequence. This may only be called immediately after initial construction, before any calls to start_msg have been made.

This function (unlike append) is not deprecated, as it allows only modification of the pipe at initialization (before use) rather than after messages have been processed.

Definition at line 203 of file pipe.cpp.

                                       {
   if(m_outputs->message_count() != 0) {
      throw Invalid_State("Cannot call Pipe::append_filter after start_msg");
   }
 
   do_append(filter);
}

check_available()

bool Botan::Pipe::check_available ( size_t n )

overridevirtual

Implements Botan::DataSource.

Definition at line 157 of file pipe_rw.cpp.

                                   {
   return (n <= remaining(default_msg()));
}

References default_msg(), and remaining().

check_available_msg()

bool Botan::Pipe::check_available_msg	(	size_t	n,
		message_id	msg ) const

Definition at line 161 of file pipe_rw.cpp.

                                                             {
   return (n <= remaining(msg));
}

References remaining().

default_msg()

size_t Botan::Pipe::default_msg ( ) const

inline

Returns

currently set default message

Definition at line 230 of file pipe.h.

{ return m_default_read; }

Referenced by check_available(), get_bytes_read(), read_all(), and read_all_as_string().

discard_next()

size_t Botan::DataSource::discard_next ( size_t N )

inherited

Discard the next N bytes of the data

Parameters

N	the number of bytes to discard

Returns

number of bytes actually discarded

Definition at line 40 of file data_src.cpp.

                                        {
   uint8_t buf[64] = {0};
   size_t discarded = 0;
 
   while(n) {
      const size_t got = this->read(buf, std::min(n, sizeof(buf)));
      discarded += got;
      n -= got;
 
      if(got == 0) {
         break;
      }
   }
 
   return discarded;
}

References Botan::DataSource::read().

end_msg()

void Botan::Pipe::end_msg

(

)

End the current message.

Definition at line 154 of file pipe.cpp.

                   {
   if(!m_inside_msg) {
      throw Invalid_State("Pipe::end_msg: Message was already ended");
   }
   m_pipe->finish_msg();
   clear_endpoints(m_pipe);
   if(dynamic_cast<Null_Filter*>(m_pipe)) {
      delete m_pipe;
      m_pipe = nullptr;
   }
   m_inside_msg = false;
 
   m_outputs->retire();
}

Referenced by process_msg(), and process_msg().

end_of_data()

bool Botan::Pipe::end_of_data ( ) const

overridevirtual

Test whether this pipe has any data that can be read from.

Returns

true if there is more data to read, false otherwise

Implements Botan::DataSource.

Definition at line 86 of file pipe.cpp.

                             {
   return (remaining() == 0);
}

References remaining().

get_bytes_read() [1/2]

size_t Botan::Pipe::get_bytes_read ( ) const

overridevirtual

Returns

the number of bytes read from the default message.

Implements Botan::DataSource.

Definition at line 149 of file pipe_rw.cpp.

                                  {
   return m_outputs->get_bytes_read(default_msg());
}

References default_msg().

get_bytes_read() [2/2]

size_t Botan::Pipe::get_bytes_read

(

message_id

msg

)

const

Returns

the number of bytes read from the specified message.

Definition at line 153 of file pipe_rw.cpp.

                                                {
   return m_outputs->get_bytes_read(msg);
}

id()

virtual std::string Botan::DataSource::id ( ) const

inlinevirtualinherited

return the id of this data source

Returns

std::string representing the id of this data source

Reimplemented in Botan::DataSource_Stream.

Definition at line 61 of file data_src.h.

{ return ""; }

message_count()

Pipe::message_id Botan::Pipe::message_count

(

)

const

Get the number of messages the are in this pipe.

Returns

number of messages the are in this pipe

Definition at line 302 of file pipe.cpp.

                                         {
   return m_outputs->message_count();
}

Referenced by set_default_msg().

operator=()

Pipe & Botan::Pipe::operator= ( const Pipe & )

delete

peek() [1/3]

size_t Botan::Pipe::peek ( uint8_t & output, size_t offset, message_id msg = DEFAULT_MESSAGE ) const

nodiscard

Read a single byte from the specified message but do not modify the internal offset. Consecutive calls to peek() will return portions of the message starting at the same position.

Parameters

output	the byte to write the peeked message byte to
offset	the offset from the current position in message
msg	the number identifying the message to peek from

Returns

number of bytes actually peeked and written into output

Definition at line 145 of file pipe_rw.cpp.

                                                                   {
   return peek(&out, 1, offset, msg);
}

References peek().

peek() [2/3]

size_t Botan::Pipe::peek ( uint8_t output[], size_t length, size_t offset ) const

nodiscardoverridevirtual

Read from the default message but do not modify the internal offset. Consecutive calls to peek() will return portions of the message starting at the same position.

Parameters

output	the byte array to write the peeked message part to
length	the length of the byte array output
offset	the offset from the current position in message

Returns

number of bytes actually peeked and written into output

Implements Botan::DataSource.

Definition at line 138 of file pipe_rw.cpp.

                                                                      {
   return peek(output, length, offset, DEFAULT_MESSAGE);
}

References DEFAULT_MESSAGE, and peek().

Referenced by peek(), and peek().

peek() [3/3]

size_t Botan::Pipe::peek ( uint8_t output[], size_t length, size_t offset, message_id msg ) const

nodiscard

Read from the specified message but do not modify the internal offset. Consecutive calls to peek() will return portions of the message starting at the same position.

Parameters

output	the byte array to write the peeked message part to
length	the length of the byte array output
offset	the offset from the current position in message
msg	the number identifying the message to peek from

Returns

number of bytes actually peeked and written into output

Definition at line 131 of file pipe_rw.cpp.

                                                                                      {
   return m_outputs->peek(output, length, offset, get_message_no("peek", msg));
}

peek_byte()

size_t Botan::DataSource::peek_byte ( uint8_t & out ) const

inherited

Peek at one byte.

Parameters

out	an output byte

Returns

length in bytes that was actually read and put into out

Definition at line 33 of file data_src.cpp.

                                               {
   return peek(&out, 1, 0);
}

References Botan::DataSource::peek().

Referenced by Botan::ASN1::maybe_BER().

pop()

void Botan::Pipe::pop

(

)

Remove the first filter at the front of the pipe.

Definition at line 278 of file pipe.cpp.

               {
   if(m_inside_msg) {
      throw Invalid_State("Cannot pop off a Pipe while it is processing");
   }
 
   if(!m_pipe) {
      return;
   }
 
   if(m_pipe->total_ports() > 1) {
      throw Invalid_State("Cannot pop off a Filter with multiple ports");
   }
 
   size_t to_remove = m_pipe->owns() + 1;
 
   while(to_remove--) {
      std::unique_ptr<Filter> to_destroy(m_pipe);
      m_pipe = m_pipe->m_next[0];
   }
}

prepend()

void Botan::Pipe::prepend

(

Filter *

filt

)

Insert a new filter at the front of the pipe Deprecated because runtime modification of Pipes is deprecated. You can instead use prepend_filter which only works before the first message is processed.

Parameters

filt	the new filter to insert

Definition at line 211 of file pipe.cpp.

                                 {
   do_prepend(filter);
}

prepend_filter()

void Botan::Pipe::prepend_filter

(

Filter *

filt

)

Prepend a new filter onto the filter sequence. This may only be called immediately after initial construction, before any calls to start_msg have been made.

This function (unlike prepend) is not deprecated, as it allows only modification of the pipe at initialization (before use) rather than after messages have been processed.

Definition at line 215 of file pipe.cpp.

                                        {
   if(m_outputs->message_count() != 0) {
      throw Invalid_State("Cannot call Pipe::prepend_filter after start_msg");
   }
 
   do_prepend(filter);
}

process_msg() [1/5]

void Botan::Pipe::process_msg

(

const secure_vector< uint8_t > &

in

)

Perform start_msg(), write() and end_msg() sequentially.

Parameters

in	the secure_vector containing the data to write

Definition at line 112 of file pipe.cpp.

                                                          {
   process_msg(input.data(), input.size());
}

References process_msg().

process_msg() [2/5]

void Botan::Pipe::process_msg

(

const std::vector< uint8_t > &

in

)

Perform start_msg(), write() and end_msg() sequentially.

Parameters

in	the secure_vector containing the data to write

Definition at line 116 of file pipe.cpp.

                                                      {
   process_msg(input.data(), input.size());
}

References process_msg().

process_msg() [3/5]

void Botan::Pipe::process_msg	(	const uint8_t	in[],
		size_t	length )

Perform start_msg(), write() and end_msg() sequentially.

Parameters

in	the byte array containing the data to write
length	the length of the byte array to write

Definition at line 103 of file pipe.cpp.

                                                           {
   start_msg();
   write(input, length);
   end_msg();
}

References end_msg(), start_msg(), and write().

Referenced by process_msg(), process_msg(), and process_msg().

process_msg() [4/5]

void Botan::Pipe::process_msg

(

DataSource &

in

)

Perform start_msg(), write() and end_msg() sequentially.

Parameters

in	the DataSource providing the data to write

Definition at line 130 of file pipe.cpp.

                                        {
   start_msg();
   write(input);
   end_msg();
}

References end_msg(), start_msg(), and write().

process_msg() [5/5]

void Botan::Pipe::process_msg

(

std::string_view

in

)

Perform start_msg(), write() and end_msg() sequentially.

Parameters

in	the string containing the data to write

Definition at line 123 of file pipe.cpp.

                                           {
   process_msg(cast_char_ptr_to_uint8(input.data()), input.length());
}

References Botan::cast_char_ptr_to_uint8(), and process_msg().

read() [1/3]

size_t Botan::Pipe::read ( uint8_t & output, message_id msg = DEFAULT_MESSAGE )

nodiscard

Read a single byte from the pipe. Moves the internal offset so that every call to read will return a new portion of the message.

Parameters

output	the byte to write the result to
msg	the message to read from

Returns

number of bytes actually read into output

Definition at line 86 of file pipe_rw.cpp.

                                              {
   return read(&out, 1, msg);
}

References read().

read() [2/3]

size_t Botan::Pipe::read ( uint8_t output[], size_t length )

nodiscardoverridevirtual

Read the default message from the pipe. Moves the internal offset so that every call to read will return a new portion of the message.

Parameters

output	the byte array to write the read bytes to
length	the length of the byte array output

Returns

number of bytes actually read into output

Implements Botan::DataSource.

Definition at line 79 of file pipe_rw.cpp.

                                                 {
   return read(output, length, DEFAULT_MESSAGE);
}

References DEFAULT_MESSAGE, and read().

Referenced by Botan::operator<<(), Botan::operator<<(), read(), read(), read_all(), and read_all_as_string().

read() [3/3]

size_t Botan::Pipe::read ( uint8_t output[], size_t length, message_id msg )

nodiscard

Read a specified message from the pipe. Moves the internal offset so that every call to read will return a new portion of the message.

Parameters

output	the byte array to write the read bytes to
length	the length of the byte array output
msg	the number identifying the message to read from

Returns

number of bytes actually read into output

Definition at line 72 of file pipe_rw.cpp.

                                                                 {
   return m_outputs->read(output, length, get_message_no("read", msg));
}

read_all()

secure_vector< uint8_t > Botan::Pipe::read_all ( message_id msg = DEFAULT_MESSAGE )

nodiscard

Read the full contents of the pipe.

Parameters

msg	the number identifying the message to read from

Returns

secure_vector holding the contents of the pipe

Definition at line 93 of file pipe_rw.cpp.

                                                    {
   msg = ((msg != DEFAULT_MESSAGE) ? msg : default_msg());
   secure_vector<uint8_t> buffer(remaining(msg));
   size_t got = read(buffer.data(), buffer.size(), msg);
   buffer.resize(got);
   return buffer;
}

References DEFAULT_MESSAGE, default_msg(), read(), and remaining().

read_all_as_string()

std::string Botan::Pipe::read_all_as_string ( message_id msg = DEFAULT_MESSAGE )

nodiscard

Read the full contents of the pipe.

Parameters

msg	the number identifying the message to read from

Returns

string holding the contents of the pipe

Definition at line 104 of file pipe_rw.cpp.

                                                 {
   msg = ((msg != DEFAULT_MESSAGE) ? msg : default_msg());
   secure_vector<uint8_t> buffer(BOTAN_DEFAULT_BUFFER_SIZE);
   std::string str;
   str.reserve(remaining(msg));
 
   while(true) {
      size_t got = read(buffer.data(), buffer.size(), msg);
      if(got == 0) {
         break;
      }
      str.append(cast_uint8_ptr_to_char(buffer.data()), got);
   }
 
   return str;
}

References BOTAN_DEFAULT_BUFFER_SIZE, Botan::cast_uint8_ptr_to_char(), DEFAULT_MESSAGE, default_msg(), read(), and remaining().

read_byte()

size_t Botan::DataSource::read_byte ( uint8_t & out )

inherited

Read one byte.

Parameters

out	the byte to read to

Returns

length in bytes that was actually read and put into out

Definition at line 26 of file data_src.cpp.

                                         {
   return read(&out, 1);
}

References Botan::DataSource::read().

Referenced by Botan::PEM_Code::decode(), Botan::BER_Decoder::discard_remaining(), and Botan::ASN1::maybe_BER().

remaining()

size_t Botan::Pipe::remaining ( message_id msg = DEFAULT_MESSAGE ) const

nodiscard

Find out how many bytes are ready to read.

Parameters

msg	the number identifying the message for which the information is desired

Returns

number of bytes that can still be read

Definition at line 124 of file pipe_rw.cpp.

                                           {
   return m_outputs->remaining(get_message_no("remaining", msg));
}

Referenced by check_available(), check_available_msg(), end_of_data(), Botan::operator<<(), Botan::operator<<(), read_all(), and read_all_as_string().

reset()

void Botan::Pipe::reset

(

)

Reset this pipe to an empty pipe.

Definition at line 64 of file pipe.cpp.

                 {
   destruct(m_pipe);
   m_pipe = nullptr;
   m_inside_msg = false;
}

set_default_msg()

void Botan::Pipe::set_default_msg

(

message_id

msg

)

Set the default message

Parameters

msg	the number identifying the message which is going to be the new default message

Definition at line 93 of file pipe.cpp.

                                         {
   if(msg >= message_count()) {
      throw Invalid_Argument("Pipe::set_default_msg: msg number is too high");
   }
   m_default_read = msg;
}

References message_count().

start_msg()

void Botan::Pipe::start_msg

(

)

Start a new message in the pipe. A potential other message in this pipe must be closed with end_msg() before this function may be called.

Definition at line 139 of file pipe.cpp.

                     {
   if(m_inside_msg) {
      throw Invalid_State("Pipe::start_msg: Message was already started");
   }
   if(m_pipe == nullptr) {
      m_pipe = new Null_Filter;
   }
   find_endpoints(m_pipe);
   m_pipe->new_msg();
   m_inside_msg = true;
}

Referenced by process_msg(), and process_msg().

write() [1/6]

void Botan::Pipe::write ( const secure_vector< uint8_t > & in )

inline

Write input to the pipe, i.e. to its first filter.

Parameters

in	the secure_vector containing the data to write

Definition at line 70 of file pipe.h.

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

References write().

Referenced by write().

write() [2/6]

void Botan::Pipe::write ( const std::vector< uint8_t > & in )

inline

Write input to the pipe, i.e. to its first filter.

Parameters

in	the std::vector containing the data to write

Definition at line 76 of file pipe.h.

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

References write().

Referenced by write().

write() [3/6]

void Botan::Pipe::write	(	const uint8_t	in[],
		size_t	length )

Write input to the pipe, i.e. to its first filter.

Parameters

in	the byte array to write
length	the length of the byte array in

Definition at line 37 of file pipe_rw.cpp.

                                                     {
   if(!m_inside_msg) {
      throw Invalid_State("Cannot write to a Pipe while it is not processing");
   }
   m_pipe->write(input, length);
}

References Botan::Filter::write().

Referenced by Botan::operator>>(), Botan::operator>>(), process_msg(), process_msg(), write(), write(), and write().

write() [4/6]

void Botan::Pipe::write

(

DataSource &

in

)

Write input to the pipe, i.e. to its first filter.

Parameters

in	the DataSource to read the data from

Definition at line 61 of file pipe_rw.cpp.

                                   {
   secure_vector<uint8_t> buffer(BOTAN_DEFAULT_BUFFER_SIZE);
   while(!source.end_of_data()) {
      size_t got = source.read(buffer.data(), buffer.size());
      write(buffer.data(), got);
   }
}

References BOTAN_DEFAULT_BUFFER_SIZE, Botan::DataSource::end_of_data(), Botan::DataSource::read(), and write().

write() [5/6]

void Botan::Pipe::write

(

std::string_view

in

)

Write input to the pipe, i.e. to its first filter.

Parameters

in	the string containing the data to write

Definition at line 47 of file pipe_rw.cpp.

                                   {
   write(cast_char_ptr_to_uint8(str.data()), str.size());
}

References Botan::cast_char_ptr_to_uint8(), and write().

write() [6/6]

void Botan::Pipe::write

(

uint8_t

in

)

Write input to the pipe, i.e. to its first filter.

Parameters

in	a single byte to be written

Definition at line 54 of file pipe_rw.cpp.

                              {
   write(&input, 1);
}

References write().

Member Data Documentation

DEFAULT_MESSAGE

const Pipe::message_id Botan::Pipe::DEFAULT_MESSAGE = static_cast<Pipe::message_id>(-1)

static

A meta-id for the default message (set with set_default_msg)

Definition at line 57 of file pipe.h.

Referenced by peek(), read(), read_all(), and read_all_as_string().

LAST_MESSAGE

const Pipe::message_id Botan::Pipe::LAST_MESSAGE = static_cast<Pipe::message_id>(-2)

static

A meta-id for whatever the last message is

Definition at line 52 of file pipe.h.

---

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

• src/lib/filters/pipe.h
• src/lib/filters/pipe.cpp
• src/lib/filters/pipe_rw.cpp