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Optimized Write function to avoid multiple vector reallocation.

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vng 2015-12-04 20:31:13 +03:00 • committed by Sergey Yershov
parent bb1ad91155
commit 9434abdd15
1 changed files with 14 additions and 2 deletions
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16
coding/writer.hpp
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@ -49,9 +49,21 @@ public:
inline void Write(void const * p, size_t size)
{
if (m_Pos + size > m_Data.size())
intptr_t freeSize = m_Data.size() - m_Pos;
if (freeSize < 0)
{
m_Data.resize(m_Pos + size);
memcpy(((uint8_t*)m_Data.data()) + m_Pos, p, size);
freeSize = size;
}
memcpy(&m_Data[m_Pos], p, min(size, static_cast<size_t>(freeSize)));
if (size > freeSize)
{
uint8_t const * it = reinterpret_cast<uint8_t const *>(p);
m_Data.insert(m_Data.end(), it + freeSize, it + size);
}
m_Pos += size;
}