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// tiff stream interface class implementation
#include "tiffstream.h"
const char* TiffStream::m_name = "TiffStream";
TiffStream::TiffStream()
{
m_tif = NULL;
m_inStream = NULL;
m_outStream = NULL;
m_ioStream = NULL;
m_streamLength = 0;
m_this = reinterpret_cast<thandle_t>(this);
};
TiffStream::~TiffStream()
{
if(m_tif != NULL) TIFFClose(m_tif);
}
TIFF*
TiffStream::makeFileStream(istream* str)
{
m_inStream = str;
m_outStream = NULL;
m_ioStream = NULL;
m_streamLength = getSize(m_this);
m_tif = TIFFClientOpen(m_name,
"r",
m_this,
read,
write,
seek,
close,
size,
map,
unmap);
return m_tif;
}
TIFF*
TiffStream::makeFileStream(ostream* str)
{
m_inStream = NULL;
m_outStream = str;
m_ioStream = NULL;
m_streamLength = getSize(m_this);
m_tif = TIFFClientOpen(m_name,
"w",
m_this,
read,
write,
seek,
close,
size,
map,
unmap);
return m_tif;
}
TIFF*
TiffStream::makeFileStream(iostream* str)
{
m_inStream = NULL;
m_outStream = NULL;
m_ioStream = str;
m_streamLength = getSize(m_this);
m_tif = TIFFClientOpen(m_name,
"r+w",
m_this,
read,
write,
seek,
close,
size,
map,
unmap);
return m_tif;
}
tsize_t
TiffStream::read(thandle_t fd, tdata_t buf, tsize_t size)
{
istream* istr;
TiffStream* ts = reinterpret_cast<TiffStream*>(fd);
if(ts->m_inStream != NULL) {
istr = ts->m_inStream;
} else if(ts->m_ioStream != NULL) {
istr = ts->m_ioStream;
}
int remain = ts->m_streamLength - ts->tell(fd);
int actual = remain < size ? remain : size;
istr->read(reinterpret_cast<char*>(buf), actual);
return istr->gcount();
}
tsize_t
TiffStream::write(thandle_t fd, tdata_t buf, tsize_t size)
{
TiffStream* ts = reinterpret_cast<TiffStream*>(fd);
ostream* ostr;
if(ts->m_outStream != NULL) {
ostr = ts->m_outStream;
} else if(ts->m_ioStream != NULL) {
ostr = ts->m_ioStream;
}
streampos start = ostr->tellp();
ostr->write(reinterpret_cast<const char*>(buf), size);
return ostr->tellp() - start;
}
toff_t
TiffStream::seek(thandle_t fd, toff_t offset, int origin)
{
TiffStream* ts = reinterpret_cast<TiffStream*>(fd);
if(ts->seekInt(fd, offset, origin) == true) return offset;
else return -1;
}
int
TiffStream::close(thandle_t fd)
{
TiffStream* ts = reinterpret_cast<TiffStream*>(fd);
if(ts->m_inStream != NULL) {
ts->m_inStream = NULL;
return 0;
} else if(ts->m_outStream != NULL) {
ts->m_outStream = NULL;
return 0;
} else if(ts->m_ioStream != NULL) {
ts->m_ioStream = NULL;
return 0;
}
return -1;
}
toff_t
TiffStream::size(thandle_t fd)
{
TiffStream* ts = reinterpret_cast<TiffStream*>(fd);
return ts->getSize(fd);
}
int
TiffStream::map(thandle_t fd, tdata_t* phase, toff_t* psize)
{
return 0;
}
void
TiffStream::unmap(thandle_t fd, tdata_t base, tsize_t size)
{
}
unsigned int
TiffStream::getSize(thandle_t fd)
{
if(!isOpen(fd)) return 0;
unsigned int pos = tell(fd);
seekInt(fd, 0, end);
unsigned int size = tell(fd);
seekInt(fd, pos, beg);
return size;
}
unsigned int
TiffStream::tell(thandle_t fd)
{
TiffStream* ts = reinterpret_cast<TiffStream*>(fd);
if(ts->m_inStream != NULL) {
return ts->m_inStream->tellg();
} else if(ts->m_outStream != NULL) {
return ts->m_outStream->tellp();
} else if(ts->m_ioStream != NULL) {
return ts->m_ioStream->tellg();
}
return 0;
}
bool
TiffStream::seekInt(thandle_t fd, unsigned int offset, int origin)
{
if(!isOpen(fd)) return false;
ios::seek_dir org;
switch(origin) {
case beg:
org = ios::beg;
break;
case cur:
org = ios::cur;
break;
case end:
org = ios::end;
break;
}
TiffStream* ts = reinterpret_cast<TiffStream*>(fd);
if(ts->m_inStream != NULL) {
ts->m_inStream->seekg(offset, org);
return true;
} else if(ts->m_outStream != NULL) {
ts->m_outStream->seekp(offset, org);
return true;
} else if(ts->m_ioStream != NULL) {
ts->m_ioStream->seekg(offset, org);
ts->m_ioStream->seekp(offset, org);
return true;
}
return false;
}
bool
TiffStream::isOpen(thandle_t fd)
{
TiffStream* ts = reinterpret_cast<TiffStream*>(fd);
return (ts->m_inStream != NULL ||
ts->m_outStream != NULL ||
ts->m_ioStream != NULL);
}/*
* Local Variables:
* mode: c++
* c-basic-offset: 8
* fill-column: 78
* End:
*/
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