abc_reader_archive.cc

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/* SPDX-FileCopyrightText: 2016 Kévin Dietrich. All rights reserved.
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#include "abc_reader_archive.h"
 
#include "Alembic/AbcCoreLayer/Read.h"
#include "Alembic/AbcCoreOgawa/ReadWrite.h"
 
#include "BKE_main.hh"
 
#include "BLI_path_utils.hh"
#include "BLI_string.h"
 
#ifdef WIN32
#  include "utfconv.hh"
#endif
 
#include <fstream>
#include <vector>
 
using Alembic::Abc::ErrorHandler;
using Alembic::Abc::Exception;
using Alembic::Abc::IArchive;
using Alembic::Abc::kWrapExisting;
 
namespace blender::io::alembic {
 
static IArchive open_archive(const std::string &filename,
                             const std::vector<std::istream *> &input_streams)
{
  try {
    Alembic::AbcCoreOgawa::ReadArchive archive_reader(input_streams);
 
    return IArchive(archive_reader(filename), kWrapExisting, ErrorHandler::kThrowPolicy);
  }
  catch (const Exception &e) {
    std::cerr << e.what() << '\n';
 
    /* Inspect the file to see whether it's actually a HDF5 file. */
    char header[4]; /* char(0x89) + "HDF" */
    std::ifstream the_file(filename.c_str(), std::ios::in | std::ios::binary);
    if (!the_file) {
      std::cerr << "Unable to open " << filename << std::endl;
    }
    else if (!the_file.read(header, sizeof(header))) {
      std::cerr << "Unable to read from " << filename << std::endl;
    }
    else if (strncmp(header + 1, "HDF", 3) != 0) {
      std::cerr << filename << " has an unknown file format, unable to read." << std::endl;
    }
    else {
      std::cerr << filename << " is in the obsolete HDF5 format, unable to read." << std::endl;
    }
 
    if (the_file.is_open()) {
      the_file.close();
    }
  }
 
  return IArchive();
}
 
ArchiveReader *ArchiveReader::get(const Main *bmain, const std::vector<const char *> &filenames)
{
  std::vector<ArchiveReader *> readers;
 
  for (const char *filename : filenames) {
    ArchiveReader *reader = new ArchiveReader(bmain, filename);
 
    if (!reader->valid()) {
      delete reader;
      continue;
    }
 
    readers.push_back(reader);
  }
 
  if (readers.empty()) {
    return nullptr;
  }
 
  if (readers.size() == 1) {
    return readers[0];
  }
 
  return new ArchiveReader(readers);
}
 
ArchiveReader::ArchiveReader(const std::vector<ArchiveReader *> &readers) : m_readers(readers)
{
  Alembic::AbcCoreLayer::ArchiveReaderPtrs archives;
 
  for (ArchiveReader *reader : readers) {
    archives.push_back(reader->m_archive.getPtr());
  }
 
  Alembic::AbcCoreLayer::ReadArchive layer;
  Alembic::AbcCoreAbstract::ArchiveReaderPtr arPtr = layer(archives);
 
  m_archive = IArchive(arPtr, kWrapExisting, ErrorHandler::kThrowPolicy);
}
 
ArchiveReader::ArchiveReader(const Main *bmain, const char *filename)
{
  char abs_filepath[FILE_MAX];
  STRNCPY(abs_filepath, filename);
  BLI_path_abs(abs_filepath, BKE_main_blendfile_path(bmain));
 
#ifdef WIN32
  UTF16_ENCODE(abs_filepath);
  std::wstring wstr(abs_filepath_16);
  m_infile.open(wstr.c_str(), std::ios::in | std::ios::binary);
  UTF16_UN_ENCODE(abs_filepath);
#else
  m_infile.open(abs_filepath, std::ios::in | std::ios::binary);
#endif
 
  m_streams.push_back(&m_infile);
 
  m_archive = open_archive(abs_filepath, m_streams);
}
 
ArchiveReader::~ArchiveReader()
{
  for (ArchiveReader *reader : m_readers) {
    delete reader;
  }
}
 
bool ArchiveReader::valid() const
{
  return m_archive.valid();
}
 
Alembic::Abc::IObject ArchiveReader::getTop()
{
  return m_archive.getTop();
}
 
}  // namespace blender::io::alembic