1 // ***************************************************************************
2 // BamPipe_p.cpp (c) 2011 Derek Barnett
3 // Marth Lab, Department of Biology, Boston College
4 // ---------------------------------------------------------------------------
5 // Last modified: 9 September 2011 (DB)
6 // ---------------------------------------------------------------------------
7 // Provides BAM pipe-specific IO behavior
8 // ***************************************************************************
10 #include <api/internal/BamPipe_p.h>
11 using namespace BamTools;
12 using namespace BamTools::Internal;
18 BamPipe::BamPipe(void) : ILocalIODevice() { }
20 BamPipe::~BamPipe(void) { }
22 bool BamPipe::IsRandomAccess(void) const {
26 bool BamPipe::Open(const IBamIODevice::OpenMode mode) {
28 // make sure we're starting with a fresh pipe
31 // open stdin/stdout depending on requested openmode
32 if ( mode == IBamIODevice::ReadOnly )
33 m_stream = freopen(0, "rb", stdin);
34 else if ( mode == IBamIODevice::WriteOnly )
35 m_stream = freopen(0, "wb", stdout);
37 SetErrorString("BamPipe ERROR - unsupported device mode");
41 // check that we obtained a valid FILE*
42 if ( m_stream == 0 ) {
43 string error = "BamPipe ERROR - could not open handle on ";
44 error += ( (mode == IBamIODevice::ReadOnly) ? "stdin" : "stdout" );
45 SetErrorString(error);
49 // store current IO mode & return success
54 bool BamPipe::Seek(const int64_t& position) {
55 // (void)position; // suppress compiler warning about unused variable
56 // return false; // seeking not allowed in pipe
58 BT_ASSERT_X( m_stream, "BamFile::Seek() - null stream" );
59 cerr << "BamPipe::Seek() - about to attempt seek" << endl;
60 bool result = ( fseek64(m_stream, position, SEEK_SET) == 0);
62 cerr << "BamPipe can't be seeked in" << endl;
66 // return ( fseek64(m_stream, position, SEEK_SET) == 0);