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/*************************************************
* Pipe Source File *
* (C) 1999-2005 The Botan Project *
*************************************************/
#include <botan/pipe.h>
#include <botan/out_buf.h>
#include <botan/secqueue.h>
namespace Botan {
namespace {
/*************************************************
* A Filter that does nothing *
*************************************************/
class Null_Filter : public Filter
{
public:
void write(const byte input[], u32bit length)
{ send(input, length); }
};
}
/*************************************************
* Pipe Constructor *
*************************************************/
Pipe::Pipe(Filter* f1, Filter* f2, Filter* f3, Filter* f4)
{
init();
append(f1);
append(f2);
append(f3);
append(f4);
}
/*************************************************
* Pipe Constructor *
*************************************************/
Pipe::Pipe(Filter* filter_array[], u32bit count)
{
init();
for(u32bit j = 0; j != count; j++)
append(filter_array[j]);
}
/*************************************************
* Pipe Destructor *
*************************************************/
Pipe::~Pipe()
{
destruct(pipe);
delete outputs;
}
/*************************************************
* Initialize the Pipe *
*************************************************/
void Pipe::init()
{
outputs = new Output_Buffers;
pipe = 0;
default_read = 0;
inside_msg = false;
}
/*************************************************
* Reset the Pipe *
*************************************************/
void Pipe::reset()
{
if(inside_msg)
throw Invalid_State("Pipe cannot be reset while it is processing");
destruct(pipe);
pipe = 0;
inside_msg = false;
}
/*************************************************
* Destroy the Pipe *
*************************************************/
void Pipe::destruct(Filter* to_kill)
{
if(!to_kill || dynamic_cast<SecureQueue*>(to_kill))
return;
for(u32bit j = 0; j != to_kill->total_ports(); j++)
destruct(to_kill->next[j]);
delete to_kill;
}
/*************************************************
* Test if the Pipe has any data in it *
*************************************************/
bool Pipe::end_of_data() const
{
return (remaining() == 0);
}
/*************************************************
* Set the default read message *
*************************************************/
void Pipe::set_default_msg(u32bit msg)
{
if(msg >= message_count())
throw Invalid_Argument("Pipe::set_default_msg: msg number is too high");
default_read = msg;
}
/*************************************************
* Process a full message at once *
*************************************************/
void Pipe::process_msg(const byte input[], u32bit length)
{
start_msg();
write(input, length);
end_msg();
}
/*************************************************
* Process a full message at once *
*************************************************/
void Pipe::process_msg(const MemoryRegion<byte>& input)
{
process_msg(input.begin(), input.size());
}
/*************************************************
* Process a full message at once *
*************************************************/
void Pipe::process_msg(const std::string& input)
{
process_msg((const byte*)input.c_str(), input.length());
}
/*************************************************
* Process a full message at once *
*************************************************/
void Pipe::process_msg(DataSource& input)
{
start_msg();
write(input);
end_msg();
}
/*************************************************
* Start a new message *
*************************************************/
void Pipe::start_msg()
{
if(inside_msg)
throw Invalid_State("Pipe::start_msg: Message was already started");
if(pipe == 0)
pipe = new Null_Filter;
find_endpoints(pipe);
pipe->new_msg();
inside_msg = true;
}
/*************************************************
* End the current message *
*************************************************/
void Pipe::end_msg()
{
if(!inside_msg)
throw Invalid_State("Pipe::end_msg: Message was already ended");
pipe->finish_msg();
clear_endpoints(pipe);
if(dynamic_cast<Null_Filter*>(pipe))
{
delete pipe;
pipe = 0;
}
inside_msg = false;
outputs->retire();
}
/*************************************************
* Find the endpoints of the Pipe *
*************************************************/
void Pipe::find_endpoints(Filter* f)
{
for(u32bit j = 0; j != f->total_ports(); j++)
if(f->next[j] && !dynamic_cast<SecureQueue*>(f->next[j]))
find_endpoints(f->next[j]);
else
{
SecureQueue* q = new SecureQueue;
f->next[j] = q;
outputs->add(q);
}
}
/*************************************************
* Remove the SecureQueues attached to the Filter *
*************************************************/
void Pipe::clear_endpoints(Filter* f)
{
if(!f) return;
for(u32bit j = 0; j != f->total_ports(); j++)
{
if(f->next[j] && dynamic_cast<SecureQueue*>(f->next[j]))
f->next[j] = 0;
clear_endpoints(f->next[j]);
}
}
/*************************************************
* Append a Filter to the Pipe *
*************************************************/
void Pipe::append(Filter* filter)
{
if(inside_msg)
throw Invalid_State("Cannot append to a Pipe while it is processing");
if(!filter)
return;
if(dynamic_cast<SecureQueue*>(filter))
throw Invalid_Argument("Pipe::append: SecureQueue cannot be used");
if(!pipe) pipe = filter;
else pipe->attach(filter);
}
/*************************************************
* Prepend a Filter to the Pipe *
*************************************************/
void Pipe::prepend(Filter* filter)
{
if(inside_msg)
throw Invalid_State("Cannot prepend to a Pipe while it is processing");
if(!filter)
return;
if(dynamic_cast<SecureQueue*>(filter))
throw Invalid_Argument("Pipe::prepend: SecureQueue cannot be used");
if(pipe) filter->attach(pipe);
pipe = filter;
}
/*************************************************
* Pop a Filter off the Pipe *
*************************************************/
void Pipe::pop()
{
if(inside_msg)
throw Invalid_State("Cannot pop off a Pipe while it is processing");
if(!pipe)
return;
if(pipe->total_ports() > 1)
throw Invalid_State("Cannot pop off a Filter with multiple ports");
Filter* f = pipe;
u32bit owns = f->owns();
pipe = pipe->next[0];
delete f;
while(owns--)
{
f = pipe;
pipe = pipe->next[0];
delete f;
}
}
/*************************************************
* Return the number of messages in this Pipe *
*************************************************/
u32bit Pipe::message_count() const
{
return outputs->message_count();
}
}
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