Method read_chunk_table

LASzip/src/lasreadpoint.cpp:591–786

}

BOOL LASreadPoint::read_chunk_table()
{
  // read the 8 bytes that store the location of the chunk table
  I64 chunk_table_start_position;
  try { instream->get64bitsLE((U8*)&chunk_table_start_position); } catch(...)
  {
    return FALSE;
  }

  // this is where the chunks start
  I64 chunks_start = instream->tell();

  // was compressor interrupted before getting a chance to write the chunk table?
  if ((chunk_table_start_position + 8) == chunks_start)
  {
    // no choice but to fail if adaptive chunking was used
    if (chunk_size == U32_MAX)
    {
      // create error string
      if (last_error == 0) last_error = new CHAR[128];
      // report error
      snprintf(last_error, 128, "compressor was interrupted before writing adaptive chunk table of LAZ file");
      return FALSE;
    }
    // otherwise we build the chunk table as we read the file
    number_chunks = 256;
    chunk_starts = (I64*)malloc_las(sizeof(I64) * (number_chunks + 1));
    if (chunk_starts == 0)
    {
      return FALSE;
    }
    chunk_starts[0] = chunks_start;
    tabled_chunks = 1;
    // create warning string
    if (last_warning == 0) last_warning = new CHAR[128];
    // report warning
    snprintf(last_warning, 128, "compressor was interrupted before writing chunk table of LAZ file");
    return TRUE;
  }

  // maybe the stream is not seekable
  if (!instream->isSeekable())
  {
    // no choice but to fail if adaptive chunking was used
    if (chunk_size == U32_MAX)
    {
      return FALSE;
    }
    // then we cannot seek to the chunk table but won't need it anyways
    number_chunks = 0;
    tabled_chunks = 0;
    return TRUE;
  }

  if (chunk_table_start_position == -1)
  {
    // the compressor was writing to a non-seekable stream and wrote the chunk table start at the end
    if (!instream->seekEnd(8))