Organized api/internal into subdirs

[bamtools.git] / src / api / internal / io / BamFile_p.cpp

diff --git a/src/api/internal/io/BamFile_p.cpp b/src/api/internal/io/BamFile_p.cpp
new file mode 100644 (file)
index 0000000..94c919e
--- /dev/null
+++ b/src/api/internal/io/BamFile_p.cpp
@@ -0,0 +1,67 @@
+// ***************************************************************************
+// BamFile_p.cpp (c) 2011 Derek Barnett
+// Marth Lab, Department of Biology, Boston College
+// ---------------------------------------------------------------------------
+// Last modified: 25 October 2011 (DB)
+// ---------------------------------------------------------------------------
+// Provides BAM file-specific IO behavior
+// ***************************************************************************
+
+#include "api/internal/io/BamFile_p.h"
+using namespace BamTools;
+using namespace BamTools::Internal;
+
+#include <cstdio>
+#include <iostream>
+using namespace std;
+
+BamFile::BamFile(const string& filename)
+    : ILocalIODevice()
+    , m_filename(filename)
+{ }
+
+BamFile::~BamFile(void) { }
+
+void BamFile::Close(void) {
+    if ( IsOpen() ) {
+        m_filename.clear();
+        ILocalIODevice::Close();
+    }
+}
+
+bool BamFile::IsRandomAccess(void) const {
+    return true;
+}
+
+bool BamFile::Open(const IBamIODevice::OpenMode mode) {
+
+    // make sure we're starting with a fresh file stream
+    Close();
+
+    // attempt to open FILE* depending on requested openmode
+    if ( mode == IBamIODevice::ReadOnly )
+        m_stream = fopen(m_filename.c_str(), "rb");
+    else if ( mode == IBamIODevice::WriteOnly )
+        m_stream = fopen(m_filename.c_str(), "wb");
+    else {
+        SetErrorString("BamFile::Open", "unknown open mode requested");
+        return false;
+    }
+
+    // check that we obtained a valid FILE*
+    if ( m_stream == 0 ) {
+        const string message_base = string("could not open file handle for ");
+        const string message = message_base + ( (m_filename.empty()) ? "empty filename" : m_filename );
+        SetErrorString("BamFile::Open", message);
+        return false;
+    }
+
+    // store current IO mode & return success
+    m_mode = mode;
+    return true;
+}
+
+bool BamFile::Seek(const int64_t& position) {
+    BT_ASSERT_X( m_stream, "BamFile::Seek() - null stream" );
+    return ( fseek64(m_stream, position, SEEK_SET) == 0 );
+}