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#pragma once
#include "endianness.hpp"
#include "source.hpp"
#include "../base/assert.hpp"
#include "../base/base.hpp"
#include "../base/exception.hpp"
#include "../base/macros.hpp"
#include "../std/shared_ptr.hpp"
#include "../std/string.hpp"
#include "../std/memcpy.hpp"
// Base class for random-access Reader. Not thread-safe.
class Reader
{
public:
DECLARE_EXCEPTION(Exception, RootException);
DECLARE_EXCEPTION(OpenException, Exception);
DECLARE_EXCEPTION(ReadException, Exception);
virtual ~Reader() {}
virtual uint64_t Size() const = 0;
virtual void Read(uint64_t pos, void * p, size_t size) const = 0;
virtual Reader * CreateSubReader(uint64_t pos, uint64_t size) const = 0;
void ReadAsString(string & s) const;
};
// Reader from memory.
class MemReader : public Reader
{
public:
MemReader() {} // TODO: Remove MemReader().
// Construct from block of memory.
MemReader(void const * pData, size_t size)
: m_pData(static_cast<char const *>(pData)), m_Size(size)
{
}
inline uint64_t Size() const
{
return m_Size;
}
inline void Read(uint64_t pos, void * p, size_t size) const
{
ASSERT_LESS_OR_EQUAL(pos + size, Size(), (pos, size));
memcpy(p, m_pData + pos, size);
}
inline MemReader SubReader(uint64_t pos, uint64_t size) const
{
ASSERT_LESS_OR_EQUAL(pos + size, Size(), (pos, size));
return MemReader(m_pData + pos, static_cast<size_t>(size));
}
inline MemReader * CreateSubReader(uint64_t pos, uint64_t size) const
{
ASSERT_LESS_OR_EQUAL(pos + size, Size(), (pos, size));
return new MemReader(m_pData + pos, static_cast<size_t>(size));
}
private:
char const * m_pData;
size_t m_Size;
};
// Reader wrapper to hold the pointer to a polymorfic reader.
// Common use: ReaderSource<ReaderPtr<Reader> >.
// Note! It takes the ownership of Reader.
template <class ReaderT> class ReaderPtr
{
protected:
shared_ptr<ReaderT> m_p;
public:
ReaderPtr(ReaderT * p) : m_p(p) {}
uint64_t Size() const
{
return m_p->Size();
}
void Read(uint64_t pos, void * p, size_t size) const
{
m_p->Read(pos, p, size);
}
void ReadAsString(string & s) const
{
m_p->ReadAsString(s);
}
};
// Model reader store file id as string.
class ModelReader : public Reader
{
string m_name;
public:
ModelReader(string const & name) : m_name(name) {}
virtual ModelReader * CreateSubReader(uint64_t pos, uint64_t size) const = 0;
bool IsEqual(string const & name) const;
string GetName() const { return m_name; }
};
// Reader pointer class for data files.
class ModelReaderPtr : public ReaderPtr<ModelReader>
{
typedef ReaderPtr<ModelReader> base_type;
public:
ModelReaderPtr(ModelReader * p) : base_type(p) {}
inline ModelReaderPtr SubReader(uint64_t pos, uint64_t size) const
{
return m_p->CreateSubReader(pos, size);
}
inline bool IsEqual(string const & name) const
{
return m_p->IsEqual(name);
}
inline bool IsEqual(ModelReaderPtr const & file) const
{
return m_p->IsEqual(file.m_p->GetName());
}
};
// Source that reads from a reader.
template <typename ReaderT> class ReaderSource
{
public:
typedef ReaderT ReaderType;
ReaderSource(ReaderT const & reader) : m_reader(reader), m_pos(0)
{
}
void Read(void * p, size_t size)
{
if (m_pos + size > m_reader.Size())
{
size_t remainingSize = static_cast<size_t>(m_reader.Size() - m_pos);
m_reader.Read(m_pos, p, remainingSize);
m_pos = m_reader.Size();
MYTHROW1(SourceOutOfBoundsException, remainingSize, ());
}
else
{
m_reader.Read(m_pos, p, size);
m_pos += size;
}
}
void Skip(uint64_t size)
{
m_pos += size;
}
uint64_t Pos() const
{
return m_pos;
}
ReaderT const & Reader() const
{
return m_reader;
}
ReaderT SubReader(uint64_t size)
{
uint64_t pos = m_pos;
m_pos += size;
return m_reader.SubReader(pos, size);
}
ReaderT SubReader()
{
return SubReader(m_reader.Size() - m_pos);
}
private:
ReaderT m_reader;
uint64_t m_pos;
};
template <class ReaderT> inline
void ReadFromPos(ReaderT const & reader, uint64_t pos, void * p, size_t size)
{
reader.Read(pos, p, size);
}
template <typename PrimitiveT, class ReaderT> inline
PrimitiveT ReadPrimitiveFromPos(ReaderT const & reader, uint64_t pos)
{
PrimitiveT primitive;
ReadFromPos(reader, pos, &primitive, sizeof(primitive));
return SwapIfBigEndian(primitive);
}
template <typename PrimitiveT, class TSource> inline
PrimitiveT ReadPrimitiveFromSource(TSource & source)
{
PrimitiveT primitive;
source.Read(&primitive, sizeof(primitive));
return SwapIfBigEndian(primitive);
}
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