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#pragma once
#include "base/assert.hpp"
#include "base/base.hpp"
#include "base/exception.hpp"
#include "std/algorithm.hpp"
#include "std/shared_ptr.hpp"
#include "std/cstring.hpp"
#include "std/string.hpp"
#include "std/vector.hpp"
// Generic Writer. Not thread-safe.
// When SubWriter is used, pos can negative, so int64_t is used to store pos.
class Writer
{
public:
DECLARE_EXCEPTION(Exception, RootException);
DECLARE_EXCEPTION(OpenException, Exception);
DECLARE_EXCEPTION(WriteException, Exception);
DECLARE_EXCEPTION(PosException, Exception);
DECLARE_EXCEPTION(SeekException, Exception);
DECLARE_EXCEPTION(CreateDirException, Exception);
virtual ~Writer() {}
virtual void Seek(int64_t pos) = 0;
virtual int64_t Pos() const = 0;
virtual void Write(void const * p, size_t size) = 0;
};
template <typename ContainerT>
class MemWriter : public Writer
{
public:
inline MemWriter(ContainerT & data) : m_Data(data), m_Pos(0)
{
static_assert(sizeof(typename ContainerT::value_type) == 1, "");
}
inline void Seek(int64_t pos)
{
ASSERT_EQUAL(pos, static_cast<intptr_t>(pos), ());
ASSERT_GREATER_OR_EQUAL(pos, 0, ());
m_Pos = static_cast<intptr_t>(pos);
}
inline int64_t Pos() const
{
return m_Pos;
}
inline void Write(void const * p, size_t size)
{
intptr_t freeSize = m_Data.size() - m_Pos;
if (freeSize < 0)
{
m_Data.resize(m_Pos + 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;
}
private:
ContainerT & m_Data;
size_t m_Pos;
};
// Original writer should not be used when SubWriter is active!
// In destructor, SubWriter calls Seek() of original writer to the end of what has been written.
template <typename WriterT>
class SubWriter
{
public:
inline explicit SubWriter(WriterT & writer)
: m_writer(writer), m_pos(0), m_maxPos(0)
#ifdef DEBUG
, m_offset(GetOffset())
#endif
{
}
~SubWriter()
{
ASSERT_EQUAL(m_offset, GetOffset(), ());
if (m_pos != m_maxPos)
Seek(m_maxPos);
}
inline void Seek(int64_t pos)
{
ASSERT_EQUAL(m_offset, GetOffset(), ());
m_writer.Seek(GetOffset() + pos);
m_pos = pos;
m_maxPos = max(m_maxPos, m_pos);
}
inline int64_t Pos() const
{
ASSERT_EQUAL(m_offset, GetOffset(), ());
return m_pos;
}
inline void Write(void const * p, size_t size)
{
ASSERT_EQUAL(m_offset, GetOffset(), ());
m_writer.Write(p, size);
m_pos += size;
m_maxPos = max(m_maxPos, m_pos);
}
inline uint64_t Size() const { return m_maxPos; }
private:
inline uint64_t GetOffset() const { return m_writer.Pos() - m_pos; }
private:
WriterT & m_writer;
int64_t m_pos;
int64_t m_maxPos;
#ifdef DEBUG
int64_t const m_offset;
#endif
};
template<typename WriterT>
class WriterPtr
{
public:
WriterPtr(WriterT * p = 0) : m_p(p) {}
void Seek(int64_t pos)
{
m_p->Seek(pos);
}
int64_t Pos() const
{
return m_p->Pos();
}
void Write(void const * p, size_t size)
{
m_p->Write(p, size);
}
WriterT * GetPtr() const { return m_p.get(); }
protected:
shared_ptr<WriterT> m_p;
};
template <typename WriterT>
class WriterSink
{
public:
inline WriterSink(WriterT & writer) : m_writer(writer), m_pos(0) {}
inline void Write(void const * p, size_t size)
{
m_writer.Write(p, size);
m_pos += size;
}
private:
WriterT & m_writer;
int64_t m_pos;
};
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