/*
   Source File : Type2CharStringWriter.cpp


   Copyright 2011 Gal Kahana PDFWriter

   Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.

   
*/
#include "Type2CharStringWriter.h"
#include "IByteWriter.h"

using namespace PDFHummus;

Type2CharStringWriter::Type2CharStringWriter(IByteWriter* inTargetStream)
{
	mTargetStream = inTargetStream;
}

Type2CharStringWriter::~Type2CharStringWriter(void)
{
}

void Type2CharStringWriter::Assign(IByteWriter* inTargetStream)
{
	mTargetStream = inTargetStream;
}

EStatusCode Type2CharStringWriter::WriteHintMask(unsigned long inMask,unsigned long inMaskSize)
{
	unsigned long maskByteSize = inMaskSize/8 + (inMaskSize % 8 != 0 ? 1:0);	
	
	EStatusCode status = WriteOperator(19);
	if(status != PDFHummus::eSuccess)
		return status;

	return WriteMaskBytes(inMask,maskByteSize);
}

EStatusCode Type2CharStringWriter::WriteMaskBytes(unsigned long inMask,unsigned long inMaskByteSize)
{
	EStatusCode status;

	if(inMaskByteSize > 1)
	{
		status = WriteMaskBytes(inMask >> 1,inMaskByteSize - 1);
		if(status != PDFHummus::eSuccess)
			return status;
	}
	return WriteByte((Byte)(inMask & 0xff));
}

EStatusCode Type2CharStringWriter::WriteByte(Byte inValue)
{
	return (mTargetStream->Write(&inValue,1) == 1 ? PDFHummus::eSuccess:PDFHummus::eFailure);
}

EStatusCode Type2CharStringWriter::WriteIntegerOperand(long inOperand)
{
	long value = inOperand;

	if(-107 <= value && value <= 107)
	{
		return WriteByte((Byte)(value + 139));
	}
	else if(108 <= value && value <= 1131)
	{
		Byte byte0,byte1;

		value-=108;
		byte0 = ((value >> 8) & 0xff) + 247;
		byte1 = value & 0xff;

		if(WriteByte(byte0) != PDFHummus::eSuccess)
			return PDFHummus::eFailure;

		if(WriteByte(byte1) != PDFHummus::eSuccess)
			return PDFHummus::eFailure;
		return PDFHummus::eSuccess;
	}
	else if(-1131 <= value && value <= -108)
	{
		Byte byte0,byte1;

		value = -(value + 108);

		byte0 = ((value >> 8) & 0xff) + 251;
		byte1 = value & 0xff;

		if(WriteByte(byte0) != PDFHummus::eSuccess)
			return PDFHummus::eFailure;

		if(WriteByte(byte1) != PDFHummus::eSuccess)
			return PDFHummus::eFailure;
		return PDFHummus::eSuccess;
	}
	else if(-32768 <= value && value<= 32767)
	{
		Byte byte1,byte2;

		byte1 = (value >> 8) & 0xff;
		byte2 = value & 0xff;

		if(WriteByte(28) != PDFHummus::eSuccess)
			return PDFHummus::eFailure;

		if(WriteByte(byte1) != PDFHummus::eSuccess)
			return PDFHummus::eFailure;

		if(WriteByte(byte2) != PDFHummus::eSuccess)
			return PDFHummus::eFailure;
		return PDFHummus::eSuccess;
	}
	else
        return PDFHummus::eFailure;
    
}

EStatusCode Type2CharStringWriter::WriteOperator(unsigned short inOperatorCode)
{
	if((inOperatorCode & 0xff00) == 0x0c00)
	{
		if(WriteByte(0x0c) != PDFHummus::eSuccess)
			return PDFHummus::eFailure;
	}
	return WriteByte(Byte(inOperatorCode & 0x00ff));
}