X-Git-Url: http://git.tdb.fi/?p=libs%2Fcore.git;a=blobdiff_plain;f=source%2Fio%2Fseekable.h;h=84a556163e764e40ed837703434a01dfd60fe9a9;hp=cabb9dcdfc7ffc50b979163e447443fdd100e3e2;hb=HEAD;hpb=86e0004bd195bc7f7478cf736871339bddf38127

diff --git a/source/io/seekable.h b/source/io/seekable.h
index cabb9dc..e549d24 100644
--- a/source/io/seekable.h
+++ b/source/io/seekable.h
@@ -1,11 +1,18 @@
 #ifndef MSP_IO_SEEKABLE_H_
 #define MSP_IO_SEEKABLE_H_
 
+#include <cstdint>
+#include <stdexcept>
+#include <msp/core/mspcore_api.h>
 #include "base.h"
 
 namespace Msp {
 namespace IO {
 
+class Handle;
+
+typedef std::int64_t SeekOffset;
+
 enum SeekType
 {
 	S_BEG,
@@ -13,22 +20,31 @@ enum SeekType
 	S_END
 };
 
-int sys_seek_type(SeekType);
+
+class MSPCORE_API bad_seek: public std::runtime_error
+{
+public:
+	bad_seek(SeekOffset, SeekType);
+	~bad_seek() throw() override = default;
+};
 
 
-class Seekable: public Base
+class MSPCORE_API Seekable: public Base
 {
 protected:
-	Seekable() { }
+	Seekable() = default;
 
 public:
 	/** Changes the read/write offset.  Returns the new offset. */
-	virtual unsigned seek(int, SeekType) = 0;
+	virtual SeekOffset seek(SeekOffset, SeekType) = 0;
 	
 	/** Returns the current read/write offset. */
-	virtual unsigned tell() const = 0;
+	virtual SeekOffset tell() const = 0;
 };
 
+
+SeekOffset sys_seek(Handle &, SeekOffset, SeekType);
+
 } // namespace IO
 } // namespace Msp