bool SunRasterDecoder::readHeader()
{
bool result = false;
if( !m_strm.open( m_filename )) return false;
try
{
m_strm.skip( 4 );
m_width = m_strm.getDWord();
m_height = m_strm.getDWord();
m_bpp = m_strm.getDWord();
int palSize = 3*(1 << m_bpp);
m_strm.skip( 4 );
m_encoding = (SunRasType)m_strm.getDWord();
m_maptype = (SunRasMapType)m_strm.getDWord();
m_maplength = m_strm.getDWord();
if( m_width > 0 && m_height > 0 &&
(m_bpp == 1 || m_bpp == 8 || m_bpp == 24 || m_bpp == 32) &&
(m_type == RAS_OLD || m_type == RAS_STANDARD ||
(m_type == RAS_BYTE_ENCODED && m_bpp == 8) || m_type == RAS_FORMAT_RGB) &&
((m_maptype == RMT_NONE && m_maplength == 0) ||
(m_maptype == RMT_EQUAL_RGB && m_maplength <= palSize && m_bpp <= 8)))
{
memset( m_palette, 0, sizeof(m_palette));
if( m_maplength != 0 )
{
uchar buffer[256*3];
if( m_strm.getBytes( buffer, m_maplength ) == m_maplength )
{
int i;
palSize = m_maplength/3;
for( i = 0; i < palSize; i++ )
{
m_palette[i].b = buffer[i + 2*palSize];
m_palette[i].g = buffer[i + palSize];
m_palette[i].r = buffer[i];
m_palette[i].a = 0;
}
m_type = IsColorPalette( m_palette, m_bpp ) ? CV_8UC3 : CV_8UC1;
m_offset = m_strm.getPos();
assert( m_offset == 32 + m_maplength );
result = true;
}
}
else
{
m_type = m_bpp > 8 ? CV_8UC3 : CV_8UC1;
if( CV_MAT_CN(m_type) == 1 )
FillGrayPalette( m_palette, m_bpp );
m_offset = m_strm.getPos();
assert( m_offset == 32 + m_maplength );
result = true;
}
}
}
catch(...)
{
}
if( !result )
{
m_offset = -1;
m_width = m_height = -1;
m_strm.close();
}
return result;
}
bool GrFmtSunRasterReader::ReadHeader()
{
bool result = false;
assert( strlen(m_filename) != 0 );
if( !m_strm.Open( m_filename )) return false;
if( setjmp( m_strm.JmpBuf()) == 0 )
{
m_strm.Skip( 4 );
m_width = m_strm.GetDWord();
m_height = m_strm.GetDWord();
m_bpp = m_strm.GetDWord();
int palSize = 3*(1 << m_bpp);
m_strm.Skip( 4 );
m_type = (SunRasType)m_strm.GetDWord();
m_maptype = (SunRasMapType)m_strm.GetDWord();
m_maplength = m_strm.GetDWord();
if( m_width > 0 && m_height > 0 &&
(m_bpp == 1 || m_bpp == 8 || m_bpp == 24 || m_bpp == 32) &&
(m_type == RAS_OLD || m_type == RAS_STANDARD ||
(m_type == RAS_BYTE_ENCODED && m_bpp == 8) || m_type == RAS_FORMAT_RGB) &&
(m_maptype == RMT_NONE && m_maplength == 0 ||
m_maptype == RMT_EQUAL_RGB && m_maplength <= palSize && m_bpp <= 8))
{
memset( m_palette, 0, sizeof(m_palette));
if( m_maplength != 0 )
{
int readed;
uchar buffer[256*3];
m_strm.GetBytes( buffer, m_maplength, &readed );
if( readed == m_maplength )
{
int i;
palSize = m_maplength/3;
for( i = 0; i < palSize; i++ )
{
m_palette[i].b = buffer[i + 2*palSize];
m_palette[i].g = buffer[i + palSize];
m_palette[i].r = buffer[i];
m_palette[i].a = 0;
}
m_iscolor = IsColorPalette( m_palette, m_bpp );
m_offset = m_strm.GetPos();
assert( m_offset == 32 + m_maplength );
result = true;
}
}
else
{
m_iscolor = m_bpp > 8;
if( !m_iscolor )
FillGrayPalette( m_palette, m_bpp );
m_offset = m_strm.GetPos();
assert( m_offset == 32 + m_maplength );
result = true;
}
}
}
if( !result )
{
m_offset = -1;
m_width = m_height = -1;
m_strm.Close();
}
return result;
}
