IO::Stream Class Reference
#include <stream.h>
Inheritance diagram for IO::Stream:
Detailed Description
Offers an abstract interface for read/write access to a sequence of bytes. Base class for all classes which need to provide a read/write interface to data, like a FileStream, a MemoryStream, etc...Stream objects can be accessed directly, or through stream reader and writer classes, which offer specific read/writing interfaces to streams.
(C) 2006 Radon Labs GmbH
Public Types | |
| enum | AccessMode |
| access modes | |
| enum | AccessPattern |
| access prefered pattern | |
| enum | SeekOrigin |
| seek origins | |
| typedef int | Position |
| typedefs | |
Public Member Functions | |
| Stream () | |
| constructor | |
| virtual | ~Stream () |
| destructor | |
| void | SetURI (const URI &u) |
| set stream location as URI | |
| const URI & | GetURI () const |
| get stream URI | |
| virtual bool | CanRead () const |
| return true if the stream supports reading | |
| virtual bool | CanWrite () const |
| return true if the stream supports writing | |
| virtual bool | CanSeek () const |
| return true if the stream supports seeking | |
| virtual bool | CanBeMapped () const |
| return true if the stream provides direct memory access | |
| virtual void | SetSize (Size s) |
| set a new size for the stream | |
| virtual Size | GetSize () const |
| get the size of the stream in bytes | |
| virtual Position | GetPosition () const |
| get the current position of the read/write cursor | |
| void | SetAccessMode (AccessMode m) |
| set the access mode of the stream (default is ReadAccess) | |
| AccessMode | GetAccessMode () const |
| get the access mode of the stream | |
| void | SetAccessPattern (AccessPattern p) |
| set the prefered access pattern (default is Sequential) | |
| AccessPattern | GetAccessPattern () const |
| get the prefered access pattern | |
| void | SetMediaType (const MediaType &t) |
| set optional media type of stream content | |
| const MediaType & | GetMediaType () const |
| get optional media type | |
| virtual bool | Open () |
| open the stream | |
| virtual void | Close () |
| close the stream | |
| bool | IsOpen () const |
| return true if currently open | |
| virtual void | Write (const void *ptr, Size numBytes) |
| directly write to the stream | |
| virtual Size | Read (void *ptr, Size numBytes) |
| directly read from the stream | |
| virtual void | Seek (Offset offset, SeekOrigin origin) |
| seek in stream | |
| virtual void | Flush () |
| flush unsaved data | |
| virtual bool | Eof () const |
| return true if end-of-stream reached | |
| virtual void * | Map () |
| map stream to memory | |
| virtual void | Unmap () |
| unmap stream | |
| bool | IsMapped () const |
| return true if stream is currently mapped to memory | |
| int | GetRefCount () const |
| get the current refcount | |
| void | AddRef () |
| increment refcount by one | |
| void | Release () |
| decrement refcount and destroy object if refcount is zero | |
| bool | IsInstanceOf (const Rtti &rtti) const |
| return true if this object is instance of given class | |
| bool | IsInstanceOf (const Util::String &className) const |
| return true if this object is instance of given class by string | |
| bool | IsInstanceOf (const Util::FourCC &classFourCC) const |
| return true if this object is instance of given class by fourcc | |
| bool | IsA (const Rtti &rtti) const |
| return true if this object is instance of given class, or a derived class | |
| bool | IsA (const Util::String &rttiName) const |
| return true if this object is instance of given class, or a derived class, by string | |
| bool | IsA (const Util::FourCC &rttiFourCC) const |
| return true if this object is instance of given class, or a derived class, by fourcc | |
| const Util::String & | GetClassName () const |
| get the class name | |
| Util::FourCC | GetClassFourCC () const |
| get the class FourCC code | |
Static Public Member Functions | |
| static void | DumpRefCountingLeaks () |
| dump refcounting leaks, call at end of application (NEBULA3_DEBUG builds only!) | |
Member Function Documentation
| void IO::Stream::SetURI | ( | const URI & | u | ) |
| bool IO::Stream::CanRead | ( | ) | const [virtual] |
return true if the stream supports reading
This method must return true if the derived stream class supports reading.
Reimplemented in IO::FileStream, IO::MemoryStream, and IO::ZipFileStream.
| bool IO::Stream::CanWrite | ( | ) | const [virtual] |
return true if the stream supports writing
This method must return true if the derived stream class supports writing.
Reimplemented in IO::FileStream, IO::MemoryStream, and IO::ZipFileStream.
| bool IO::Stream::CanSeek | ( | ) | const [virtual] |
return true if the stream supports seeking
This method must return true if the derived stream supports seeking.
Reimplemented in IO::FileStream, IO::MemoryStream, and IO::ZipFileStream.
| bool IO::Stream::CanBeMapped | ( | ) | const [virtual] |
return true if the stream provides direct memory access
This method must return true if the stream supports direct memory access through the Map()/Unmap() methods.
Reimplemented in IO::FileStream, IO::MemoryStream, and IO::ZipFileStream.
| void IO::Stream::SetSize | ( | Size | s | ) | [virtual] |
set a new size for the stream
This sets a new size for the stream. Not all streams support this method. If the new size if smaller then the existing size, the contents will be clipped.
| Stream::Size IO::Stream::GetSize | ( | ) | const [virtual] |
get the size of the stream in bytes
This method returns the size of the stream in bytes.
Reimplemented in IO::FileStream, IO::MemoryStream, and IO::ZipFileStream.
| Stream::Position IO::Stream::GetPosition | ( | ) | const [virtual] |
get the current position of the read/write cursor
This method returns the current position of the read/write cursor.
Reimplemented in IO::FileStream, IO::MemoryStream, and IO::ZipFileStream.
| void IO::Stream::SetAccessMode | ( | AccessMode | m | ) |
set the access mode of the stream (default is ReadAccess)
This method sets the intended access mode of the stream. The actual behaviour depends on the implementation of the derived class. The default is ReadWrite.
| Stream::AccessMode IO::Stream::GetAccessMode | ( | ) | const |
get the access mode of the stream
Get the access mode of the stream.
| void IO::Stream::SetAccessPattern | ( | AccessPattern | p | ) |
set the prefered access pattern (default is Sequential)
Set the prefered access pattern of the stream. This can be Random or Sequential. This is an optional flag to improve performance with some stream implementations. The default is sequential. The pattern cannot be changed while the stream is open.
| Stream::AccessPattern IO::Stream::GetAccessPattern | ( | ) | const |
get the prefered access pattern
Get the currently set prefered access pattern of the stream.
| bool IO::Stream::Open | ( | ) | [virtual] |
open the stream
Open the stream. Only one thread may open a stream at any time. Returns true if succeeded.
Reimplemented in IO::FileStream, IO::MemoryStream, and IO::ZipFileStream.
| void IO::Stream::Close | ( | ) | [virtual] |
close the stream
Closes the stream.
Reimplemented in IO::FileStream, IO::MemoryStream, and IO::ZipFileStream.
| bool IO::Stream::IsOpen | ( | ) | const |
return true if currently open
Return true if the stream is currently open.
| void IO::Stream::Write | ( | const void * | ptr, | |
| Size | numBytes | |||
| ) | [virtual] |
directly write to the stream
Write raw data to the stream. For more convenient writing, attach the stream to an IO::StreamWriter object. This method is only valid if the stream class returns true in CanWrite().
| Stream::Size IO::Stream::Read | ( | void * | ptr, | |
| Size | numBytes | |||
| ) | [virtual] |
directly read from the stream
Read raw data from the stream. For more convenient reading, attach the stream to an IO::StreamReader object. The method returns the number of bytes actually read. This method is only valid if the stream class returns true in CanRead(). Returns the number of bytes actually read from the stream, this may be less then numBytes, or 0 if end-of-stream is reached.
| void IO::Stream::Seek | ( | Offset | offset, | |
| SeekOrigin | origin | |||
| ) | [virtual] |
seek in stream
Move the read/write cursor to a new position, returns the new position in the stream. This method is only supported if the stream class returns true in CanSeek().
| void IO::Stream::Flush | ( | ) | [virtual] |
flush unsaved data
Flush any unsaved data. Note that unsaved data will also be flushed automatically when the stream is closed.
Reimplemented in IO::FileStream.
| bool IO::Stream::Eof | ( | ) | const [virtual] |
return true if end-of-stream reached
Return true if the read/write cursor is at the end of the stream.
Reimplemented in IO::FileStream, IO::MemoryStream, and IO::ZipFileStream.
| void * IO::Stream::Map | ( | ) | [virtual] |
map stream to memory
If the stream provides memory mapping, this method will return a pointer to the beginning of the stream data in memory. The application is free to read and write to the stream through direct memory access. Special care must be taken to not read or write past the end of the mapped data (indicated by GetSize()). The normal Read()/Write() method are not valid while the stream is mapped, also the read/write cursor position will not be updated.
Reimplemented in IO::FileStream, IO::MemoryStream, and IO::ZipFileStream.
| void IO::Stream::Unmap | ( | ) | [virtual] |
unmap stream
This will unmap a memory-mapped stream.
Reimplemented in IO::FileStream, IO::MemoryStream, and IO::ZipFileStream.
| bool IO::Stream::IsMapped | ( | ) | const |
return true if stream is currently mapped to memory
Returns true if the stream is currently mapped.
| int Core::RefCounted::GetRefCount | ( | ) | const [inline, inherited] |
get the current refcount
Return the current refcount of the object.
| void Core::RefCounted::AddRef | ( | ) | [inline, inherited] |
increment refcount by one
Increment the refcount of the object.
| void Core::RefCounted::Release | ( | ) | [inline, inherited] |
decrement refcount and destroy object if refcount is zero
Decrement the refcount and destroy object if refcount is zero.
| const Util::String & Core::RefCounted::GetClassName | ( | ) | const [inline, inherited] |
get the class name
Get the class name of the object.
| Util::FourCC Core::RefCounted::GetClassFourCC | ( | ) | const [inline, inherited] |
get the class FourCC code
Get the class FourCC of the object.
| void Core::RefCounted::DumpRefCountingLeaks | ( | ) | [static, inherited] |
dump refcounting leaks, call at end of application (NEBULA3_DEBUG builds only!)
This method should be called as the very last before an application exits.