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/*
* Pipe Output Buffer Source file
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/out_buf.h>
#include <botan/secqueue.h>
namespace Botan {
/*
* Read data from a message
*/
u32bit Output_Buffers::read(byte output[], u32bit length,
Pipe::message_id msg)
{
SecureQueue* q = get(msg);
if(q)
return q->read(output, length);
return 0;
}
/*
* Peek at data in a message
*/
u32bit Output_Buffers::peek(byte output[], u32bit length,
u32bit stream_offset,
Pipe::message_id msg) const
{
SecureQueue* q = get(msg);
if(q)
return q->peek(output, length, stream_offset);
return 0;
}
/*
* Check available bytes in a message
*/
u32bit Output_Buffers::remaining(Pipe::message_id msg) const
{
SecureQueue* q = get(msg);
if(q)
return q->size();
return 0;
}
/*
* Add a new output queue
*/
void Output_Buffers::add(SecureQueue* queue)
{
if(!queue)
throw Internal_Error("Output_Buffers::add: Argument was NULL");
if(buffers.size() == buffers.max_size())
throw Internal_Error("Output_Buffers::add: No more room in container");
buffers.push_back(queue);
}
/*
* Retire old output queues
*/
void Output_Buffers::retire()
{
while(buffers.size())
{
if(buffers[0] == 0 || buffers[0]->size() == 0)
{
delete buffers[0];
buffers.pop_front();
offset = offset + Pipe::message_id(1);
}
else
break;
}
}
/*
* Get a particular output queue
*/
SecureQueue* Output_Buffers::get(Pipe::message_id msg) const
{
if(msg < offset)
return 0;
if(msg > message_count())
throw Internal_Error("Output_Buffers::get: msg > size");
return buffers[msg-offset];
}
/*
* Return the total number of messages
*/
Pipe::message_id Output_Buffers::message_count() const
{
return (offset + buffers.size());
}
/*
* Output_Buffers Constructor
*/
Output_Buffers::Output_Buffers()
{
offset = 0;
}
/*
* Output_Buffers Destructor
*/
Output_Buffers::~Output_Buffers()
{
for(u32bit j = 0; j != buffers.size(); ++j)
delete buffers[j];
}
}
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