src/tiff/contrib/stream/tiffstream.cpp

   1 // tiff stream interface class implementation
   2
   3 #include "tiffstream.h"
   4
   5 const char* TiffStream::m_name = "TiffStream";
   6
   7 TiffStream::TiffStream()
   8 {
   9     m_tif = NULL;
  10
  11
  12     m_inStream = NULL;
  13         m_outStream = NULL;
  14         m_ioStream = NULL;
  15
  16         m_streamLength = 0;
  17
  18         m_this = reinterpret_cast<thandle_t>(this);
  19 };
  20
  21 TiffStream::~TiffStream()
  22 {
  23     if(m_tif != NULL) TIFFClose(m_tif);
  24 }
  25
  26 TIFF*
  27 TiffStream::makeFileStream(istream* str)
  28 {
  29     m_inStream = str;
  30         m_outStream = NULL;
  31         m_ioStream = NULL;
  32     m_streamLength = getSize(m_this);
  33
  34     m_tif =  TIFFClientOpen(m_name,
  35                            "r",
  36                                                    m_this,
  37                                                    read,
  38                                                    write,
  39                                                    seek,
  40                                                    close,
  41                                                    size,
  42                                                    map,
  43                                                    unmap);
  44     return m_tif;
  45 }
  46
  47 TIFF*
  48 TiffStream::makeFileStream(ostream* str)
  49 {
  50         m_inStream = NULL;
  51     m_outStream = str;
  52         m_ioStream = NULL;
  53         m_streamLength = getSize(m_this);
  54
  55         m_tif =  TIFFClientOpen(m_name,
  56                            "w",
  57                                                    m_this,
  58                                                    read,
  59                                                    write,
  60                                                    seek,
  61                                                    close,
  62                                                    size,
  63                                                    map,
  64                                                    unmap);
  65     return m_tif;
  66 }
  67
  68 TIFF*
  69 TiffStream::makeFileStream(iostream* str)
  70 {
  71         m_inStream = NULL;
  72         m_outStream = NULL;
  73     m_ioStream = str;
  74         m_streamLength = getSize(m_this);
  75
  76     m_tif =  TIFFClientOpen(m_name,
  77                                "r+w",
  78                                                    m_this,
  79                                                    read,
  80                                                    write,
  81                                                    seek,
  82                                                    close,
  83                                                    size,
  84                                                    map,
  85                                                    unmap);
  86     return m_tif;
  87 }
  88
  89 tsize_t
  90 TiffStream::read(thandle_t fd, tdata_t buf, tsize_t size)
  91 {
  92         istream* istr;
  93         TiffStream* ts = reinterpret_cast<TiffStream*>(fd);
  94     if(ts->m_inStream != NULL) {
  95             istr = ts->m_inStream;
  96         } else if(ts->m_ioStream != NULL) {
  97             istr = ts->m_ioStream;
  98         }
  99
 100         int remain = ts->m_streamLength - ts->tell(fd);
 101         int actual = remain < size ? remain : size;
 102         istr->read(reinterpret_cast<char*>(buf), actual);
 103     return istr->gcount();
 104 }
 105
 106 tsize_t
 107 TiffStream::write(thandle_t fd, tdata_t buf, tsize_t size)
 108 {
 109         TiffStream* ts = reinterpret_cast<TiffStream*>(fd);
 110         ostream* ostr;
 111         if(ts->m_outStream != NULL) {
 112             ostr = ts->m_outStream;
 113         } else if(ts->m_ioStream != NULL) {
 114             ostr = ts->m_ioStream;
 115         }
 116
 117         streampos start = ostr->tellp();
 118         ostr->write(reinterpret_cast<const char*>(buf), size);
 119         return ostr->tellp() - start;
 120 }
 121
 122 toff_t
 123 TiffStream::seek(thandle_t fd, toff_t offset, int origin)
 124 {
 125     TiffStream* ts = reinterpret_cast<TiffStream*>(fd);
 126     if(ts->seekInt(fd, offset, origin) == true) return offset;
 127         else return -1;
 128 }
 129
 130 int
 131 TiffStream::close(thandle_t fd)
 132 {
 133     TiffStream* ts = reinterpret_cast<TiffStream*>(fd);
 134         if(ts->m_inStream != NULL) {
 135                 ts->m_inStream = NULL;
 136                 return 0;
 137         } else if(ts->m_outStream != NULL) {
 138                 ts->m_outStream = NULL;
 139                 return 0;
 140         } else if(ts->m_ioStream != NULL) {
 141                 ts->m_ioStream = NULL;
 142                 return 0;
 143         }
 144     return -1;
 145 }
 146
 147 toff_t
 148 TiffStream::size(thandle_t fd)
 149 {
 150     TiffStream* ts = reinterpret_cast<TiffStream*>(fd);
 151     return ts->getSize(fd);
 152 }
 153
 154 int
 155 TiffStream::map(thandle_t fd, tdata_t* phase, toff_t* psize)
 156 {
 157     return 0;
 158 }
 159
 160 void
 161 TiffStream::unmap(thandle_t fd, tdata_t base, tsize_t size)
 162 {
 163 }
 164
 165 unsigned int
 166 TiffStream::getSize(thandle_t fd)
 167 {
 168         if(!isOpen(fd)) return 0;
 169
 170     unsigned int pos = tell(fd);
 171         seekInt(fd, 0, end);
 172         unsigned int size = tell(fd);
 173         seekInt(fd, pos, beg);
 174
 175         return size;
 176 }
 177
 178 unsigned int
 179 TiffStream::tell(thandle_t fd)
 180 {
 181     TiffStream* ts = reinterpret_cast<TiffStream*>(fd);
 182     if(ts->m_inStream != NULL) {
 183             return ts->m_inStream->tellg();
 184         } else if(ts->m_outStream != NULL) {
 185             return ts->m_outStream->tellp();
 186         } else if(ts->m_ioStream != NULL) {
 187                 return ts->m_ioStream->tellg();
 188         }
 189         return 0;
 190 }
 191
 192 bool
 193 TiffStream::seekInt(thandle_t fd, unsigned int offset, int origin)
 194 {
 195         if(!isOpen(fd)) return false;
 196
 197         ios::seek_dir org;
 198         switch(origin) {
 199         case beg:
 200                 org = ios::beg;
 201                 break;
 202         case cur:
 203                 org = ios::cur;
 204                 break;
 205         case end:
 206                 org = ios::end;
 207                 break;
 208         }
 209
 210         TiffStream* ts = reinterpret_cast<TiffStream*>(fd);
 211     if(ts->m_inStream != NULL) {
 212             ts->m_inStream->seekg(offset, org);
 213                 return true;
 214         } else if(ts->m_outStream != NULL) {
 215             ts->m_outStream->seekp(offset, org);
 216                 return true;
 217         } else if(ts->m_ioStream != NULL) {
 218             ts->m_ioStream->seekg(offset, org);
 219                 ts->m_ioStream->seekp(offset, org);
 220                 return true;
 221         }
 222     return false;
 223 }
 224
 225 bool
 226 TiffStream::isOpen(thandle_t fd)
 227 {
 228         TiffStream* ts = reinterpret_cast<TiffStream*>(fd);
 229         return (ts->m_inStream != NULL ||
 230                    ts->m_outStream != NULL ||
 231                    ts->m_ioStream != NULL);
 232 }/*
 233  * Local Variables:
 234  * mode: c++
 235  * c-basic-offset: 8
 236  * fill-column: 78
 237  * End:
 238  */