///////////////////////////////////////////////////////////////////////////////
//
//	File    : $Id: _spb.cpp 54 2006-03-27 16:07:44Z epocman $
//	Subject : IBPP, internal SPB class implementation
//
///////////////////////////////////////////////////////////////////////////////
//
//	(C) Copyright 2000-2006 T.I.P. Group S.A. and the IBPP Team (www.ibpp.org)
//
//	The contents of this file are subject to the IBPP License (the "License");
//	you may not use this file except in compliance with the License.  You may
//	obtain a copy of the License at http://www.ibpp.org or in the 'license.txt'
//	file which must have been distributed along with this file.
//
//	This software, distributed under the License, is distributed on an "AS IS"
//	basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the
//	License for the specific language governing rights and limitations
//	under the License.
//
///////////////////////////////////////////////////////////////////////////////
//
//	COMMENTS
//	* SPB == Service Parameter Block/Buffer, see Interbase 6.0 C-API
//	* Tabulations should be set every four characters when editing this file.
//
///////////////////////////////////////////////////////////////////////////////

#ifdef _MSC_VER
#pragma warning(disable: 4786 4996)
#ifndef _DEBUG
#pragma warning(disable: 4702)
#endif
#endif

#include "_ibpp.h"

#ifdef HAS_HDRSTOP
#pragma hdrstop
#endif

using namespace ibpp_internals;

const int SPB::BUFFERINCR = 128;

void SPB::Grow(int needed)
{
	if ((mSize + needed) > mAlloc)
	{
		// We need to grow the buffer. We use increments of BUFFERINCR bytes.
		needed = (needed / BUFFERINCR + 1) * BUFFERINCR;
		char* newbuffer = new char[mAlloc + needed];
		if (mBuffer != 0)
		{
			// Move the old buffer content to the new one
			memcpy(newbuffer, mBuffer, mSize);
			delete [] mBuffer;
		}
		mBuffer = newbuffer;
		mAlloc += needed;
	}
}

void SPB::Insert(char opcode)
{
	Grow(1);
	mBuffer[mSize++] = opcode;
}

void SPB::InsertString(char type, int lenwidth, const char* data)
{
	int16_t len = (int16_t)strlen(data);

	Grow(1 + lenwidth + len);
	mBuffer[mSize++] = type;
	switch (lenwidth)
	{
		case 1 :	mBuffer[mSize] = char(len); mSize++; break;
		case 2 :	*(int16_t*)&mBuffer[mSize] = int16_t((isc_vax_integer)((char*)&len, 2));
					mSize += 2; break;
		default :	throw LogicExceptionImpl("IISPB::IISPB", _("Invalid length parameter"));
	}
	strncpy(&mBuffer[mSize], data, len);
	mSize += len;
}

void SPB::InsertByte(char type, char data)
{
	Grow(1 + 1);
	mBuffer[mSize++] = type;
	mBuffer[mSize++] = data;
}

void SPB::InsertQuad(char type, int32_t data)
{
	Grow(1 + 4);
	mBuffer[mSize++] = type;
	*(int32_t*)&mBuffer[mSize] = int32_t((isc_vax_integer)((char*)&data, 4));
	mSize += 4;
}

void SPB::Reset()
{
	if (mBuffer != 0)
	{
		delete [] mBuffer;
		mBuffer = 0;
		mSize = 0;
		mAlloc = 0;
    }
}

/*
void SPB::Insert(char type, short data)
{
	Grow(1 + 3);
	mBuffer[mSize++] = type;
	mBuffer[mSize++] = char(2);
	*(short*)&mBuffer[mSize] = data;
	mSize += 2;
}

void SPB::Insert(char type, bool data)
{
	Grow(1 + 2);
	mBuffer[mSize++] = type;
	mBuffer[mSize++] = char(1);
	mBuffer[mSize++] = char(data ? 1 : 0);
}
*/

//
//	EOF
//
