void
TileOffsets::reconstructFromFile (OPENEXR_IMF_INTERNAL_NAMESPACE::IStream &is,bool isMultiPart,bool isDeep)
{
//
// Try to reconstruct a missing tile offset table by sequentially
// scanning through the file, and recording the offsets in the file
// of the tiles we find.
//
Int64 position = is.tellg();
try
{
findTiles (is,isMultiPart,isDeep,false);
}
catch (...)
{
//
// Suppress all exceptions. This function is called only to
// reconstruct the tile offset table for incomplete files,
// and exceptions are likely.
//
}
is.clear();
is.seekg (position);
}
void
MultiPartInputFile::Data::chunkOffsetReconstruction(OPENEXR_IMF_INTERNAL_NAMESPACE::IStream& is, const vector<InputPartData*>& parts)
{
//
// Reconstruct broken chunk offset tables. Stop once we received any exception.
//
Int64 position = is.tellg();
//
// check we understand all the parts available: if not, we cannot continue
// exceptions thrown here should trickle back up to the constructor
//
for (size_t i = 0; i < parts.size(); i++)
{
Header& header=parts[i]->header;
//
// do we have a valid type entry?
// we only need them for true multipart files or single part non-image (deep) files
//
if(!header.hasType() && (isMultiPart(version) || isNonImage(version)))
{
throw IEX_NAMESPACE::ArgExc("cannot reconstruct incomplete file: part with missing type");
}
if(!isSupportedType(header.type()))
{
throw IEX_NAMESPACE::ArgExc("cannot reconstruct incomplete file: part with unknown type "+header.type());
}
}
// how many chunks should we read? We should stop when we reach the end
size_t total_chunks = 0;
// for tiled-based parts, array of (pointers to) tileOffsets objects
// to create mapping between tile coordinates and chunk table indices
vector<TileOffsets*> tileOffsets(parts.size());
// for scanline-based parts, number of scanlines in each part
vector<int> rowsizes(parts.size());
for(size_t i = 0 ; i < parts.size() ; i++)
{
total_chunks += parts[i]->chunkOffsets.size();
if (isTiled(parts[i]->header.type()))
{
tileOffsets[i] = createTileOffsets(parts[i]->header);
}else{
tileOffsets[i] = NULL;
switch(parts[i]->header.compression())
{
case PIZ_COMPRESSION :
case B44_COMPRESSION :
case B44A_COMPRESSION :
rowsizes[i]=32;
case ZIP_COMPRESSION :
case PXR24_COMPRESSION :
rowsizes[i]=16;
break;
case ZIPS_COMPRESSION :
case RLE_COMPRESSION :
case NO_COMPRESSION :
rowsizes[i]=1;
break;
default :
throw(IEX_NAMESPACE::ArgExc("Unknown compression method in chunk offset reconstruction"));
}
}
}
try
{
//
//
//
Int64 chunk_start = position;
for (size_t i = 0; i < total_chunks ; i++)
{
//
// do we have a part number?
//
int partNumber = 0;
if(isMultiPart(version))
{
OPENEXR_IMF_INTERNAL_NAMESPACE::Xdr::read <OPENEXR_IMF_INTERNAL_NAMESPACE::StreamIO> (is, partNumber);
}
if(partNumber<0 || partNumber>int(parts.size()))
{
// bail here - bad part number
throw int();
}
Header& header = parts[partNumber]->header;
// size of chunk NOT including multipart field
Int64 size_of_chunk=0;
if (isTiled(header.type()))
{
//
//
//
int tilex,tiley,levelx,levely;
OPENEXR_IMF_INTERNAL_NAMESPACE::Xdr::read <OPENEXR_IMF_INTERNAL_NAMESPACE::StreamIO> (is, tilex);
OPENEXR_IMF_INTERNAL_NAMESPACE::Xdr::read <OPENEXR_IMF_INTERNAL_NAMESPACE::StreamIO> (is, tiley);
OPENEXR_IMF_INTERNAL_NAMESPACE::Xdr::read <OPENEXR_IMF_INTERNAL_NAMESPACE::StreamIO> (is, levelx);
OPENEXR_IMF_INTERNAL_NAMESPACE::Xdr::read <OPENEXR_IMF_INTERNAL_NAMESPACE::StreamIO> (is, levely);
//std::cout << "chunk_start for " << tilex <<',' << tiley << ',' << levelx << ' ' << levely << ':' << chunk_start << std::endl;
if(!tileOffsets[partNumber])
{
// this shouldn't actually happen - we should have allocated a valid
// tileOffsets for any part which isTiled
throw int();
}
if(!tileOffsets[partNumber]->isValidTile(tilex,tiley,levelx,levely))
{
//std::cout << "invalid tile : aborting\n";
throw int();
}
(*tileOffsets[partNumber])(tilex,tiley,levelx,levely)=chunk_start;
// compute chunk sizes - different procedure for deep tiles and regular
// ones
if(header.type()==DEEPTILE)
{
Int64 packed_offset;
Int64 packed_sample;
OPENEXR_IMF_INTERNAL_NAMESPACE::Xdr::read <OPENEXR_IMF_INTERNAL_NAMESPACE::StreamIO> (is, packed_offset);
OPENEXR_IMF_INTERNAL_NAMESPACE::Xdr::read <OPENEXR_IMF_INTERNAL_NAMESPACE::StreamIO> (is, packed_sample);
//add 40 byte header to packed sizes (tile coordinates, packed sizes, unpacked size)
size_of_chunk=packed_offset+packed_sample+40;
}
else
{
// regular image has 20 bytes of header, 4 byte chunksize;
int chunksize;
OPENEXR_IMF_INTERNAL_NAMESPACE::Xdr::read <OPENEXR_IMF_INTERNAL_NAMESPACE::StreamIO> (is, chunksize);
size_of_chunk=chunksize+20;
}
}
else
{
int y_coordinate;
OPENEXR_IMF_INTERNAL_NAMESPACE::Xdr::read <OPENEXR_IMF_INTERNAL_NAMESPACE::StreamIO> (is, y_coordinate);
y_coordinate -= header.dataWindow().min.y;
y_coordinate /= rowsizes[partNumber];
if(y_coordinate<0 || y_coordinate>int(parts[partNumber]->chunkOffsets.size()))
{
//std::cout << "aborting reconstruction: bad data " << y_coordinate << endl;
//bail to exception catcher: broken scanline
throw int();
}
parts[partNumber]->chunkOffsets[y_coordinate]=chunk_start;
//std::cout << "chunk_start for " << y_coordinate << ':' << chunk_start << std::endl;
if(header.type()==DEEPSCANLINE)
{
Int64 packed_offset;
Int64 packed_sample;
OPENEXR_IMF_INTERNAL_NAMESPACE::Xdr::read <OPENEXR_IMF_INTERNAL_NAMESPACE::StreamIO> (is, packed_offset);
OPENEXR_IMF_INTERNAL_NAMESPACE::Xdr::read <OPENEXR_IMF_INTERNAL_NAMESPACE::StreamIO> (is, packed_sample);
size_of_chunk=packed_offset+packed_sample+28;
}
else
{
int chunksize;
OPENEXR_IMF_INTERNAL_NAMESPACE::Xdr::read <OPENEXR_IMF_INTERNAL_NAMESPACE::StreamIO> (is, chunksize);
size_of_chunk=chunksize+8;
}
}
if(isMultiPart(version))
{
chunk_start+=4;
}
chunk_start+=size_of_chunk;
//std::cout << " next chunk +"<<size_of_chunk << " = " << chunk_start << std::endl;
is.seekg(chunk_start);
}
}
catch (...)
{
//
// Suppress all exceptions. This functions is
// called only to reconstruct the line offset
// table for incomplete files, and exceptions
// are likely.
//
}
// copy tiled part data back to chunk offsets
for(size_t partNumber=0;partNumber<parts.size();partNumber++)
{
if(tileOffsets[partNumber])
{
size_t pos=0;
vector<vector<vector <Int64> > > offsets = tileOffsets[partNumber]->getOffsets();
for (size_t l = 0; l < offsets.size(); l++)
for (size_t y = 0; y < offsets[l].size(); y++)
for (size_t x = 0; x < offsets[l][y].size(); x++)
{
parts[ partNumber ]->chunkOffsets[pos] = offsets[l][y][x];
pos++;
}
delete tileOffsets[partNumber];
}
}
is.clear();
is.seekg (position);
}