CNcbiIstream*
CLDS2_UrlHandler_GZipFile::OpenStream(const SLDS2_File& file_info,
Int8 stream_pos,
CLDS2_Database* db)
{
auto_ptr<CNcbiIfstream> in(
new CNcbiIfstream(file_info.name.c_str(), ios::binary));
if ( !in->is_open() ) {
return NULL;
}
if ( db ) {
// Try to use chunks information to optimize loading
SLDS2_Chunk chunk;
if ( db->FindChunk(file_info, chunk, stream_pos) ) {
if (chunk.raw_pos > 0) {
in->seekg(NcbiInt8ToStreampos(chunk.raw_pos));
}
stream_pos -= chunk.stream_pos;
}
}
auto_ptr<CCompressionIStream> zin(
new CCompressionIStream(
*in.release(),
new CZipStreamDecompressor(CZipCompression::fGZip),
CCompressionStream::fOwnAll));
zin->ignore(NcbiInt8ToStreampos(stream_pos));
return zin.release();
}
CNcbiIstream*
CLDS2_UrlHandler_File::OpenStream(const SLDS2_File& file_info,
Int8 stream_pos,
CLDS2_Database* /*db*/)
{
auto_ptr<CNcbiIfstream> in(
new CNcbiIfstream(file_info.name.c_str(), ios::binary));
// Chunks are not supported for regular files,
/// offset is relative to the file start.
if (stream_pos > 0) {
in->seekg(NcbiInt8ToStreampos(stream_pos));
}
return in.release();
}
CT_POS_TYPE CMemoryLineReader::GetPosition(void) const
{
return NcbiInt8ToStreampos(m_Pos - m_Start);
}
