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/**
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0.
*/
#include <aws/core/utils/stream/SimpleStreamBuf.h>
#include <aws/core/utils/logging/LogMacros.h>
#include <algorithm>
#include <cassert>
#include <cstring>
namespace Aws
{
namespace Utils
{
namespace Stream
{
static const uint32_t DEFAULT_BUFFER_SIZE = 100;
static const char* SIMPLE_STREAMBUF_ALLOCATION_TAG = "SimpleStreamBufTag";
SimpleStreamBuf::SimpleStreamBuf() :
m_buffer(nullptr),
m_bufferSize(0)
{
m_buffer = Aws::NewArray<char>(DEFAULT_BUFFER_SIZE, SIMPLE_STREAMBUF_ALLOCATION_TAG);
m_bufferSize = DEFAULT_BUFFER_SIZE;
char* begin = m_buffer;
char* end = begin + m_bufferSize;
setp(begin, end);
setg(begin, begin, begin);
}
SimpleStreamBuf::SimpleStreamBuf(const Aws::String& value) :
m_buffer(nullptr),
m_bufferSize(0)
{
size_t baseSize = (std::max)(value.size(), static_cast<std::size_t>(DEFAULT_BUFFER_SIZE));
m_buffer = Aws::NewArray<char>(baseSize, SIMPLE_STREAMBUF_ALLOCATION_TAG);
m_bufferSize = baseSize;
std::memcpy(m_buffer, value.c_str(), value.size());
char* begin = m_buffer;
char* end = begin + m_bufferSize;
setp(begin + value.size(), end);
setg(begin, begin, begin);
}
SimpleStreamBuf::~SimpleStreamBuf()
{
if(m_buffer)
{
Aws::DeleteArray<char>(m_buffer);
m_buffer = nullptr;
}
m_bufferSize = 0;
}
std::streampos SimpleStreamBuf::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((pptr() - m_buffer) - off, which);
}
else if (dir == std::ios_base::cur)
{
if(which == std::ios_base::in)
{
return seekpos((gptr() - m_buffer) + off, which);
}
else
{
return seekpos((pptr() - m_buffer) + off, which);
}
}
return off_type(-1);
}
std::streampos SimpleStreamBuf::seekpos(std::streampos pos, std::ios_base::openmode which)
{
size_t maxSeek = pptr() - m_buffer;
assert(static_cast<size_t>(pos) <= maxSeek);
if (static_cast<size_t>(pos) > maxSeek)
{
return pos_type(off_type(-1));
}
if (which == std::ios_base::in)
{
setg(m_buffer, m_buffer + static_cast<size_t>(pos), pptr());
}
if (which == std::ios_base::out)
{
setp(m_buffer + static_cast<size_t>(pos), epptr());
}
return pos;
}
bool SimpleStreamBuf::GrowBuffer()
{
size_t currentSize = m_bufferSize;
size_t newSize = currentSize * 2;
char* newBuffer = Aws::NewArray<char>(newSize, SIMPLE_STREAMBUF_ALLOCATION_TAG);
if(newBuffer == nullptr)
{
return false;
}
if(currentSize > 0)
{
if(m_buffer)
{
std::memcpy(newBuffer, m_buffer, currentSize);
}
else
{
AWS_LOGSTREAM_FATAL(SIMPLE_STREAMBUF_ALLOCATION_TAG, "Unexpected nullptr m_buffer");
}
}
if(m_buffer)
{
Aws::DeleteArray<char>(m_buffer);
}
m_buffer = newBuffer;
m_bufferSize = newSize;
return true;
}
int SimpleStreamBuf::overflow (int c)
{
auto endOfFile = std::char_traits< char >::eof();
if(c == endOfFile)
{
return endOfFile;
}
char* old_begin = m_buffer;
char *old_pptr = pptr();
char *old_gptr = gptr();
char *old_egptr = egptr();
size_t currentWritePosition = m_bufferSize;
if(!GrowBuffer())
{
return endOfFile;
}
char* new_begin = m_buffer;
char* new_end = new_begin + m_bufferSize;
setp(new_begin + (old_pptr - old_begin) + 1, new_end);
setg(new_begin, new_begin + (old_gptr - old_begin), new_begin + (old_egptr - old_begin));
auto val = std::char_traits< char >::to_char_type(c);
*(new_begin + currentWritePosition) = val;
return c;
}
std::streamsize SimpleStreamBuf::xsputn(const char* s, std::streamsize n)
{
std::streamsize writeCount = 0;
while(writeCount < n)
{
char* current_pptr = pptr();
char* current_epptr = epptr();
if (current_pptr < current_epptr)
{
std::size_t copySize = (std::min)(static_cast< std::size_t >(n - writeCount),
static_cast< std::size_t >(current_epptr - current_pptr));
std::memcpy(current_pptr, s + writeCount, copySize);
writeCount += copySize;
setp(current_pptr + copySize, current_epptr);
setg(m_buffer, gptr(), pptr());
}
else if (overflow(std::char_traits< char >::to_int_type(*(s + writeCount))) != std::char_traits<char>::eof())
{
writeCount++;
}
else
{
return writeCount;
}
}
return writeCount;
}
Aws::String SimpleStreamBuf::str() const
{
return Aws::String(m_buffer, pptr());
}
int SimpleStreamBuf::underflow()
{
if(egptr() != pptr())
{
setg(m_buffer, gptr(), pptr());
}
if(gptr() != egptr())
{
return std::char_traits< char >::to_int_type(*gptr());
}
else
{
return std::char_traits< char >::eof();
}
}
void SimpleStreamBuf::str(const Aws::String& value)
{
char* begin = m_buffer;
char* end = begin + m_bufferSize;
setp(begin, end);
setg(begin, begin, begin);
xsputn(value.c_str(), value.size());
}
}
}
}
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