/****************************************************************************
Copyright (c) 2006, Radon Labs GmbH
Copyright (c) 2011-2013,WebJet Business Division,CYOU
 
http://www.genesis-3d.com.cn

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/

#include "stdneb.h"
#include "io/binarywriter.h"

namespace IO
{
__ImplementClass(IO::BinaryWriter, 'BINW', IO::StreamWriter);

using namespace Util;
using namespace System;

 
using namespace Math;

    
//------------------------------------------------------------------------------
/**
*/
BinaryWriter::BinaryWriter() :
    enableMapping(false),
    isMapped(false),
    mapCursor(0),
    mapEnd(0)
{
    // empty
}

//------------------------------------------------------------------------------
/**
*/
BinaryWriter::~BinaryWriter()
{
    if (this->IsOpen())
    {
        this->Close();
    }
}

//------------------------------------------------------------------------------
/**
*/
bool
BinaryWriter::Open()
{
    if (StreamWriter::Open())
    {
        if (this->enableMapping && this->stream->CanBeMapped())
        {
            this->isMapped = true;
            this->mapCursor = (unsigned char*) this->stream->Map();
            this->mapEnd = this->mapCursor + this->stream->GetSize();
        }
        else
        {
            this->isMapped = false;
            this->mapCursor = 0;
            this->mapEnd = 0;
        }
        return true;
    }
    return false;
}

//------------------------------------------------------------------------------
/**
*/
void
BinaryWriter::Close()
{
    StreamWriter::Close();
    this->isMapped = false;
    this->mapCursor = 0;
    this->mapEnd = 0;
}

//------------------------------------------------------------------------------
/**
*/
void
BinaryWriter::WriteChar(char c)
{
    if (this->isMapped)
    {
        n_assert(this->mapCursor < this->mapEnd);
        *this->mapCursor++ = c;
    }
    else
    {
        this->stream->Write(&c, sizeof(c));
    }
}

//------------------------------------------------------------------------------
/**
*/
void
BinaryWriter::WriteUChar(unsigned char c)
{
    if (this->isMapped)
    {
        n_assert(this->mapCursor < this->mapEnd);
        *this->mapCursor++ = c;
    }
    else
    {
        this->stream->Write(&c, sizeof(c));
    }
}

//------------------------------------------------------------------------------
/**
*/
void
BinaryWriter::WriteShort(short s)
{
    s = this->byteOrder.Convert<short>(s);
    if (this->isMapped)
    {
        // note: the memory copy is necessary to circumvent alignment problem on some CPUs
        n_assert((this->mapCursor + sizeof(s)) <= this->mapEnd);
        Memory::Copy(&s, this->mapCursor, sizeof(s));
        this->mapCursor += sizeof(s);
    }
    else
    {
        this->stream->Write(&s, sizeof(s));
    }
}

//------------------------------------------------------------------------------
/**
*/
void
BinaryWriter::WriteUShort(unsigned short s)
{
    s = this->byteOrder.Convert<ushort>(s);
    if (this->isMapped)
    {
        // note: the memory copy is necessary to circumvent alignment problem on some CPUs
        n_assert((this->mapCursor + sizeof(s)) <= this->mapEnd);
        Memory::Copy(&s, this->mapCursor, sizeof(s));
        this->mapCursor += sizeof(s);
    }
    else
    {
        this->stream->Write(&s, sizeof(s));
    }
}

//------------------------------------------------------------------------------
/**
*/
void
BinaryWriter::WriteInt(int i)
{
    i = this->byteOrder.Convert<int>(i);
    if (this->isMapped)
    {
        // note: the memory copy is necessary to circumvent alignment problem on some CPUs
        n_assert((this->mapCursor + sizeof(i)) <= this->mapEnd);
        Memory::Copy(&i, this->mapCursor, sizeof(i));
        this->mapCursor += sizeof(i);
    }
    else
    {
        this->stream->Write(&i, sizeof(i));
    }
}

//------------------------------------------------------------------------------
/**
*/
void
BinaryWriter::WriteUInt(unsigned int i)
{
    i = this->byteOrder.Convert<uint>(i);
    if (this->isMapped)
    {
        // note: the memory copy is necessary to circumvent alignment problem on some CPUs
        n_assert((this->mapCursor + sizeof(i)) <= this->mapEnd);
        Memory::Copy(&i, this->mapCursor, sizeof(i));
        this->mapCursor += sizeof(i);
    }
    else
    {
        this->stream->Write(&i, sizeof(i));
    }
}

//------------------------------------------------------------------------------
/**
*/
void
BinaryWriter::WriteFloat(float f)
{
    f = this->byteOrder.Convert<float>(f);
    if (this->isMapped)
    {
        // note: the memory copy is necessary to circumvent alignment problem on some CPUs
        n_assert((this->mapCursor + sizeof(f)) <= this->mapEnd);
        Memory::Copy(&f, this->mapCursor, sizeof(f));
        this->mapCursor += sizeof(f);
    }
    else
    {
        this->stream->Write(&f, sizeof(f));
    }
}

//------------------------------------------------------------------------------
/**
*/
void
BinaryWriter::WriteFloatAsNormalizedUByte2(float f)
{
    n_assert(f >= -1.0f && f <= 1.0f);
    unsigned short compressedVal = (unsigned short)((f + 1.0f) * 32767.5f);   
    this->WriteUShort(compressedVal);
}
          
//------------------------------------------------------------------------------
/**
*/
void 
BinaryWriter::WriteFloatAsUnsignedNormalizedUByte2(float f)
{
    n_assert(f >= 0.0f && f <= 1.0f);
    unsigned short compressedVal = (unsigned short)(f * 65535.0f);   
    this->WriteUShort(compressedVal);
}

//------------------------------------------------------------------------------
/**
*/
void
BinaryWriter::WriteDouble(double d)
{
    d = this->byteOrder.Convert<double>(d);
    if (this->isMapped)
    {
        // note: the memory copy is necessary to circumvent alignment problem on some CPUs
        n_assert((this->mapCursor + sizeof(d)) <= this->mapEnd);
        Memory::Copy(&d, this->mapCursor, sizeof(d));
        this->mapCursor += sizeof(d);
    }
    else
    {
        this->stream->Write(&d, sizeof(d));
    }
}

//------------------------------------------------------------------------------
/**
*/
void
BinaryWriter::WriteBool(bool b)
{
    if (this->isMapped)
    {
        // note: the memory copy is necessary to circumvent alignment problem on some CPUs
        n_assert((this->mapCursor + sizeof(b)) <= this->mapEnd);
        Memory::Copy(&b, this->mapCursor, sizeof(b));
        this->mapCursor += sizeof(b);
    }
    else
    {
        this->stream->Write(&b, sizeof(b));
    }
}

//------------------------------------------------------------------------------
/**
    NOTE: for strings, first the length will be written into a
    32-bit int, then the string contents without the 0-terminator.
*/
void
BinaryWriter::WriteString(const Util::String& s)
{
    n_assert(s.Length() < (1<<16));
    this->WriteUShort(ushort(s.Length()));
    if (s.Length() > 0)
    {
        if (this->isMapped)
        {
            n_assert((this->mapCursor + s.Length()) <= this->mapEnd);
            Memory::Copy(s.AsCharPtr(), this->mapCursor, s.Length());
            this->mapCursor += s.Length();
        }
        else
        {
            this->stream->Write((void*)s.AsCharPtr(), s.Length());
        }
    }
}

//------------------------------------------------------------------------------
/**
*/
void
BinaryWriter::WriteBlob(const Util::Blob& blob)
{
    this->WriteUInt(blob.Size());
    if (this->isMapped)
    {
        n_assert((this->mapCursor + blob.Size()) <= this->mapEnd);
        Memory::Copy(blob.GetPtr(), this->mapCursor, blob.Size());
        this->mapCursor += blob.Size();
    }
    else
    {
        this->stream->Write(blob.GetPtr(), blob.Size());
    }
}

//------------------------------------------------------------------------------
/**
*/
void
BinaryWriter::WriteGuid(const Util::Guid& guid)
{
    const unsigned char* ptr;
    SizeT size = guid.AsBinary(ptr);
    Util::Blob blob(ptr, size);
    this->WriteBlob(blob);
}


//------------------------------------------------------------------------------
/**
*/
void 
BinaryWriter::WriteFloat2(Math::float2 f)
{
    float2 val(this->byteOrder.Convert<float>(f.x()),
               this->byteOrder.Convert<float>(f.y()));
    if (this->isMapped)
    {
        // note: the memory copy is necessary to circumvent alignment problem on some CPUs
        n_assert((this->mapCursor + sizeof(f)) <= this->mapEnd);
        Memory::Copy(&val, this->mapCursor, sizeof(val));
        this->mapCursor += sizeof(val);
    }
    else
    {
        this->stream->Write(&val, sizeof(val));
    }
}

//------------------------------------------------------------------------------
/**
*/
void
BinaryWriter::WriteFloat4(const float4& v)
{
    float4 val = v;
    this->byteOrder.ConvertInPlace<float4>(val);
    if (this->isMapped)
    {
        // note: the memory copy is necessary to circumvent alignment problem on some CPUs
        n_assert((this->mapCursor + sizeof(v)) <= this->mapEnd);
        Memory::Copy(&val, this->mapCursor, sizeof(val));
        this->mapCursor += sizeof(val);
    }
    else
    {
        this->stream->Write(&val, sizeof(val));
    }
}

//------------------------------------------------------------------------------
/**
*/
void 
BinaryWriter::WritePoint(const Math::point& v)
{
    float val[3];
    val[0] = this->byteOrder.Convert<float>(v.x());
    val[1] = this->byteOrder.Convert<float>(v.y());
    val[2] = this->byteOrder.Convert<float>(v.z());
    const SizeT writeSize = sizeof(float) * 3; 
    if (this->isMapped)
    {
        // note: the memory copy is necessary to circumvent alignment problem on some CPUs
        n_assert((this->mapCursor + writeSize) <= this->mapEnd);
        Memory::Copy(val, this->mapCursor, writeSize);
        this->mapCursor += writeSize;
    }
    else
    {
        this->stream->Write(val, writeSize);
    }
}

//------------------------------------------------------------------------------
/**
*/
void 
BinaryWriter::WriteVector(const Math::vector& v)
{
    float val[3];
    val[0] = this->byteOrder.Convert<float>(v.x());
    val[1] = this->byteOrder.Convert<float>(v.y());
    val[2] = this->byteOrder.Convert<float>(v.z());
    const SizeT writeSize = sizeof(float) * 3; 
    if (this->isMapped)
    {
        // note: the memory copy is necessary to circumvent alignment problem on some CPUs
        n_assert((this->mapCursor + writeSize) <= this->mapEnd);
        Memory::Copy(val, this->mapCursor, writeSize);
        this->mapCursor += writeSize;
    }
    else
    {
        this->stream->Write(val, writeSize);
    }
}

//------------------------------------------------------------------------------
/**
*/
void
BinaryWriter::WriteMatrix44(const matrix44& m)
{
    matrix44 val = m;
    this->byteOrder.ConvertInPlace<matrix44>(val);
    if (this->isMapped)
    {
        // note: the memory copy is necessary to circumvent alignment problem on some CPUs
        n_assert((this->mapCursor + sizeof(val)) <= this->mapEnd);
        Memory::Copy(&val, this->mapCursor, sizeof(val));
        this->mapCursor += sizeof(val);
    }
    else
    {
        this->stream->Write(&val, sizeof(val));
    }
}

    
//------------------------------------------------------------------------------
/**
*/
void
BinaryWriter::WriteRawData(const void* ptr, SizeT numBytes)
{
    n_assert((ptr != 0) && (numBytes > 0));
    if (this->isMapped)
    {
        n_assert((this->mapCursor + numBytes) <= this->mapEnd);
        Memory::Copy(ptr, this->mapCursor, numBytes);
        this->mapCursor += numBytes;
    }
    else
    {
        this->stream->Write(ptr, numBytes);
    }
}
} // namespace IO