X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/36f062d3da45b04cda586d432fccfbdd4e81ce5a..7344108e8a129a3f9b4df5ab0f98a1713db03b89:/interface/wx/stream.h

diff --git a/interface/wx/stream.h b/interface/wx/stream.h
index 7900f3ef0b..6fd27a4126 100644
--- a/interface/wx/stream.h
+++ b/interface/wx/stream.h
@@ -3,7 +3,7 @@
 // Purpose:     interface of wxStreamBase and its derived classes
 // Author:      wxWidgets team
 // RCS-ID:      $Id$
-// Licence:     wxWindows license
+// Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
 
@@ -76,10 +76,22 @@ public:
     virtual bool IsOk() const;
 
     /**
-        Returns @true if the streams supports seeking to arbitrary offsets.
+        Returns @true if the stream supports seeking to arbitrary offsets.
     */
     virtual bool IsSeekable() const;
 
+    /**
+        Resets the stream state.
+
+        By default, resets the stream to good state, i.e. clears any errors.
+        Since wxWidgets 2.9.3 can be also used to explicitly set the state to
+        the specified error (the @a error argument didn't exist in the previous
+        versions).
+
+        @see GetLastError()
+     */
+    void Reset(wxStreamError error = wxSTREAM_NO_ERROR);
+
     /**
         Returns the opposite of IsOk().
         You can use this function to test the validity of the stream as if
@@ -138,6 +150,13 @@ protected:
 class wxStreamBuffer
 {
 public:
+    /** BufMode flags */
+    enum BufMode
+    {
+        read,
+        write,
+        read_write
+    };
 
     /**
         Constructor, creates a new stream buffer using @a stream as a parent stream
@@ -229,7 +248,7 @@ public:
         Destructor.
         It finalizes all IO calls and frees all internal buffers if necessary.
     */
-    wxStreamBuffer();
+    ~wxStreamBuffer();
 
     /**
         Fill the IO buffer.
@@ -589,7 +608,7 @@ public:
 
     /**
         Reads the specified amount of bytes and stores the data in buffer.
-        To check if the call was successfull you must use LastRead() to check
+        To check if the call was successful you must use LastRead() to check
         if this call did actually read @a size bytes (if it didn't, GetLastError()
         should return a meaningful value).
 
@@ -613,6 +632,11 @@ public:
     /**
         Changes the stream current position.
 
+        This operation in general is possible only for seekable streams 
+        (see wxStreamBase::IsSeekable()); non-seekable streams support only
+        seeking positive amounts in mode @c wxFromCurrent (this is implemented
+        by reading data and simply discarding it).
+
         @param pos
             Offset to seek to.
         @param mode
@@ -623,7 +647,9 @@ public:
     virtual wxFileOffset SeekI(wxFileOffset pos, wxSeekMode mode = wxFromStart);
 
     /**
-        Returns the current stream position.
+        Returns the current stream position or ::wxInvalidOffset if it's not
+        available (e.g. socket streams do not have a size nor a current stream
+        position).
     */
     virtual wxFileOffset TellI() const;
 
@@ -661,7 +687,7 @@ protected:
         reached or an error occurred (in this last case the internal @c m_lasterror
         variable should be set accordingly as well).
     */
-    size_t OnSysRead(void* buffer, size_t bufsize);
+    size_t OnSysRead(void* buffer, size_t bufsize) = 0;
 };
 
 
@@ -829,7 +855,7 @@ public:
         const wxFilterClassFactory *factory = wxFilterClassFactory::GetFirst();
 
         while (factory) {
-            list << factory->GetProtocol() << _T("\n");
+            list << factory->GetProtocol() << wxT("\n");
             factory = factory->GetNext();
         }
         @endcode
@@ -859,7 +885,7 @@ public:
         const wxChar *const *p;
 
         for (p = factory->GetProtocols(wxSTREAM_FILEEXT); *p; p++)
-            list << *p << _T("\n");
+            list << *p << wxT("\n");
         @endcode
     */
     virtual const wxChar * const* GetProtocols(wxStreamProtocolType type = wxSTREAM_PROTOCOL) const = 0;
@@ -1040,3 +1066,57 @@ public:
 };
 
 
+/**
+    @class wxWrapperInputStream
+
+    A wrapper input stream is a kind of filter stream which forwards all the
+    operations to its base stream. This is useful to build utility classes such
+    as wxFSInputStream.
+
+    @note
+    The interface of this class is the same as that of wxInputStream.
+    Only a constructor differs and it is documented below.
+
+    @library{wxbase}
+    @category{streams}
+
+    @see wxFSInputStream, wxFilterInputStream
+    @since 2.9.4
+*/
+class wxWrapperInputStream : public wxFilterInputStream
+{
+public:
+    //@{
+    /**
+        Initializes a wrapper stream.
+
+        If the parent stream is passed as a pointer then the new wrapper stream
+        takes ownership of it. If it is passed by reference then it does not.
+    */
+    wxWrapperInputStream(wxInputStream& stream);
+    wxWrapperInputStream(wxInputStream* stream);
+    //@}
+
+protected:
+    /**
+        Default constructor, use InitParentStream() to finish initialization.
+
+        This constructor can be used by the derived classes from their own
+        constructors when the parent stream can't be specified immediately.
+        The derived class must call InitParentStream() later to do it.
+     */
+    wxWrapperInputStream();
+
+    //@{
+    /**
+        Set up the wrapped stream for an object initialized using the default
+        constructor.
+
+        The ownership logic is the same as for the non-default constructor,
+        i.e. this object takes ownership of the stream if it's passed by
+        pointer but not if it's passed by reference.
+     */
+    void InitParentStream(wxInputStream& stream);
+    void InitParentStream(wxInputStream* stream);
+    //@}
+};