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MemoryStream.cpp
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192 lines (174 loc) · 3.55 KB
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#include "MemoryStream.hpp"
#include "Exceptions.hpp"
MemoryStream::MemoryStream()
: MemoryStream(0)
{
}
//---------------------------------------------------------------------------
MemoryStream::MemoryStream(int _capacity)
: buffer(_capacity),
length(0),
capacity(_capacity),
position(0),
isOpen(true),
isExpandable(true)
{
}
//---------------------------------------------------------------------------
MemoryStream::MemoryStream(const std::vector<uint8_t>& _buffer)
: buffer(_buffer),
length((int)_buffer.size()),
capacity((int)_buffer.size()),
position(0),
isOpen(true),
isExpandable(false)
{
}
//---------------------------------------------------------------------------
MemoryStream::~MemoryStream()
{
isOpen = false;
}
//---------------------------------------------------------------------------
int MemoryStream::GetCapacity() const
{
if (!isOpen)
{
throw IOException();
}
return capacity;
}
//---------------------------------------------------------------------------
void MemoryStream::SetCapacity(int value)
{
if (!isOpen)
{
throw IOException();
}
if (!isExpandable && (value != capacity))
{
throw IOException();
}
if (isExpandable && value != capacity)
{
if (value > 0)
{
buffer.resize(value);
}
else
{
buffer.clear();
}
capacity = value;
}
}
//---------------------------------------------------------------------------
int MemoryStream::GetLength() const
{
if (!isOpen)
{
throw IOException();
}
return (int)buffer.size();
}
//---------------------------------------------------------------------------
int MemoryStream::GetPosition() const
{
if (!isOpen)
{
throw IOException();
}
return position;
}
//---------------------------------------------------------------------------
void MemoryStream::SetPosition(int value)
{
if (!isOpen)
{
throw IOException();
}
position = value;
}
//---------------------------------------------------------------------------
int MemoryStream::Read(uint8_t* _buffer, int offset, int count)
{
if (!isOpen)
{
throw IOException();
}
int n = length - position;
if (n > count)
{
n = count;
}
if (n <= 0)
{
return 0;
}
int byteCount = n;
while (--byteCount >= 0)
{
_buffer[offset + byteCount] = buffer[position + byteCount];
}
position += n;
return n;
}
//---------------------------------------------------------------------------
void MemoryStream::Write(const uint8_t* _buffer, int offset, int count)
{
if (!isOpen)
{
throw IOException();
}
int i = position + count;
if (i < 0)
{
throw IOException();
}
if (i > length)
{
if (i > capacity)
{
EnsureCapacity(i);
}
length = i;
}
while (--count >= 0)
{
buffer[position + count] = _buffer[offset + count];
}
position = i;
}
//---------------------------------------------------------------------------
std::vector<uint8_t> MemoryStream::ToArray() const
{
return std::vector<uint8_t>(std::begin(buffer), std::begin(buffer) + length);
}
//---------------------------------------------------------------------------
bool MemoryStream::EnsureCapacity(int value)
{
if (value < 0)
{
throw IOException();
}
if (value > capacity)
{
int newCapacity = value;
if (newCapacity < 256)
{
newCapacity = 256;
}
if (newCapacity < capacity * 2)
{
newCapacity = capacity * 2;
}
if ((unsigned int)(capacity * 2) > MaxByteArrayLength)
{
newCapacity = (unsigned int)value > MaxByteArrayLength ? value : MaxByteArrayLength;
}
SetCapacity(newCapacity);
return true;
}
return false;
}
//---------------------------------------------------------------------------