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/**
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0.
*/
#include <aws/core/utils/event/EventStreamBuf.h>
#include <cassert>
namespace Aws
{
namespace Utils
{
namespace Event
{
const size_t DEFAULT_BUF_SIZE = 1024;
EventStreamBuf::EventStreamBuf(EventStreamDecoder& decoder, size_t bufferLength) :
m_byteBuffer(bufferLength),
m_bufferLength(bufferLength),
m_decoder(decoder)
{
assert(decoder);
char* begin = reinterpret_cast<char*>(m_byteBuffer.GetUnderlyingData());
char* end = begin + bufferLength - 1;
setp(begin, end);
setg(begin, begin, begin);
}
EventStreamBuf::~EventStreamBuf()
{
if (m_decoder)
{
writeToDecoder();
}
}
void EventStreamBuf::writeToDecoder()
{
if (pptr() > pbase())
{
size_t length = static_cast<size_t>(pptr() - pbase());
m_decoder.Pump(m_byteBuffer, length);
if (!m_decoder)
{
m_err.write(reinterpret_cast<char*>(m_byteBuffer.GetUnderlyingData()), length);
}
else
{
pbump(-static_cast<int>(length));
}
}
}
std::streampos EventStreamBuf::seekoff(std::streamoff off, std::ios_base::seekdir dir, std::ios_base::openmode which)
{
if (dir == std::ios_base::beg)
{
return seekpos(off, which);
}
else if (dir == std::ios_base::end)
{
return seekpos(m_bufferLength - 1 - off, which);
}
else if (dir == std::ios_base::cur)
{
if (which == std::ios_base::in)
{
return seekpos((gptr() - (char*)m_byteBuffer.GetUnderlyingData()) + off, which);
}
if (which == std::ios_base::out)
{
return seekpos((pptr() - (char*)m_byteBuffer.GetUnderlyingData()) + off, which);
}
}
return std::streamoff(-1);
}
std::streampos EventStreamBuf::seekpos(std::streampos pos, std::ios_base::openmode which)
{
assert(static_cast<size_t>(pos) <= m_bufferLength);
if (static_cast<size_t>(pos) > m_bufferLength)
{
return std::streampos(std::streamoff(-1));
}
if (which == std::ios_base::in)
{
m_err.seekg(pos);
return m_err.tellg();
}
if (which == std::ios_base::out)
{
return pos;
}
return std::streampos(std::streamoff(-1));
}
int EventStreamBuf::underflow()
{
if (!m_err || m_err.eof() || m_decoder)
{
return std::char_traits<char>::eof();
}
m_err.flush();
m_err.read(reinterpret_cast<char*>(m_byteBuffer.GetUnderlyingData()), m_byteBuffer.GetLength());
char* begin = reinterpret_cast<char*>(m_byteBuffer.GetUnderlyingData());
setg(begin, begin, begin + m_err.gcount());
return std::char_traits<char>::to_int_type(*gptr());
}
int EventStreamBuf::overflow(int ch)
{
auto eof = std::char_traits<char>::eof();
if (m_decoder)
{
if (ch != eof)
{
*pptr() = (char)ch;
pbump(1);
}
writeToDecoder();
return ch;
}
return eof;
}
int EventStreamBuf::sync()
{
if (m_decoder)
{
writeToDecoder();
}
return 0;
}
}
}
}
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