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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/*
* This file is part of the libpict project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
#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;
}
/* vim:set shiftwidth=2 softtabstop=2 expandtab: */
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