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/* libpict
* Copyright (C) 2011 Fridrich Strba (fridrich.strba@bluewin.ch)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02111-1301 USA
*/
#include "PictXParser.h"
#include "libpict_utils.h"
PictXParser::PictXParser(librevenge::RVNGInputStream *input, librevenge::RVNGDrawingInterface *painter):
m_input(input), m_painter(painter), m_colorPalette(std::map<int,libpict::PictColor>())
{
}
PictXParser::PictXParser(const PictXParser &parser):
m_input(parser.m_input), m_painter(parser.m_painter),
m_colorPalette(parser.m_colorPalette)
{
}
unsigned char PictXParser::readU8()
{
if (!m_input || m_input->isEnd())
return (unsigned char)0;
unsigned long numBytesRead;
unsigned char const *p = m_input->read(sizeof(unsigned char), numBytesRead);
if (p && numBytesRead == 1)
return *(unsigned char const *)(p);
return (unsigned char)0;
}
unsigned short PictXParser::readU16()
{
unsigned short p0 = (unsigned short)readU8();
unsigned short p1 = (unsigned short)readU8();
return (unsigned short)(p1|(p0<<8));
}
unsigned PictXParser::readU32()
{
unsigned p0 = (unsigned)readU8();
unsigned p1 = (unsigned)readU8();
unsigned p2 = (unsigned)readU8();
unsigned p3 = (unsigned)readU8();
return (unsigned long)(p3|(p2<<8)|(p1<<16)|(p0<<24));
}
short PictXParser::readS16()
{
return (short)readU16();
}
int PictXParser::readS32()
{
return (int)readU32();
}
unsigned PictXParser::readVariableLengthInteger()
{
// read a byte
unsigned char value8 = readU8();
// if it's in the range 0-0xFE, then we have a 8-bit value
if (value8<=0xFE)
{
return (unsigned)value8;
}
else
{
// now read a 16 bit value
unsigned short value16 = readU16();
// if the MSB is 1, we have a 32 bit value
if (value16>>15)
{
// read the next 16 bit value (LSB part, in value16 resides the MSB part)
unsigned long lvalue16 = readU16();
unsigned long value32 = value16 & 0x7fff; // mask out the MSB
return (value32<<16)+lvalue16;
}
else
{
// we have a 16 bit value, return it
return (unsigned)value16;
}
}
}
PictXParser &PictXParser::operator=(const PictXParser &parser)
{
m_input = parser.m_input;
m_painter = parser.m_painter;
m_colorPalette = parser.m_colorPalette;
return *this;
}
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