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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);
}
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