// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
-#ifndef _WX_NETWORK_SOCKET_H
-#define _WX_NETWORK_SOCKET_H
-
-#if defined(__GNUG__) && !defined(__APPLE__)
- #pragma interface "socket.h"
-#endif
+#ifndef _WX_SOCKET_H_
+#define _WX_SOCKET_H_
#include "wx/defs.h"
// wxSocket headers
// ---------------------------------------------------------------------------
-#ifdef WXPREC
- #include "wx/wxprec.h"
-#else
- #include "wx/event.h"
- #include "wx/string.h"
-#endif
-
+#include "wx/event.h"
#include "wx/sckaddr.h"
-#include "wx/gsocket.h"
+#include "wx/list.h"
+
+class wxSocketImpl;
// ------------------------------------------------------------------------
// Types and constants
// ------------------------------------------------------------------------
+// Types of different socket notifications or events.
+//
+// NB: the values here should be consecutive and start with 0 as they are
+// used to construct the wxSOCKET_XXX_FLAG bit mask values below
enum wxSocketNotify
{
- wxSOCKET_INPUT = GSOCK_INPUT,
- wxSOCKET_OUTPUT = GSOCK_OUTPUT,
- wxSOCKET_CONNECTION = GSOCK_CONNECTION,
- wxSOCKET_LOST = GSOCK_LOST
+ wxSOCKET_INPUT,
+ wxSOCKET_OUTPUT,
+ wxSOCKET_CONNECTION,
+ wxSOCKET_LOST
};
enum
{
- wxSOCKET_INPUT_FLAG = GSOCK_INPUT_FLAG,
- wxSOCKET_OUTPUT_FLAG = GSOCK_OUTPUT_FLAG,
- wxSOCKET_CONNECTION_FLAG = GSOCK_CONNECTION_FLAG,
- wxSOCKET_LOST_FLAG = GSOCK_LOST_FLAG
+ wxSOCKET_INPUT_FLAG = 1 << wxSOCKET_INPUT,
+ wxSOCKET_OUTPUT_FLAG = 1 << wxSOCKET_OUTPUT,
+ wxSOCKET_CONNECTION_FLAG = 1 << wxSOCKET_CONNECTION,
+ wxSOCKET_LOST_FLAG = 1 << wxSOCKET_LOST
};
-typedef GSocketEventFlags wxSocketEventFlags;
+// this is a combination of the bit masks defined above
+typedef int wxSocketEventFlags;
enum wxSocketError
{
- // from GSocket
- wxSOCKET_NOERROR = GSOCK_NOERROR,
- wxSOCKET_INVOP = GSOCK_INVOP,
- wxSOCKET_IOERR = GSOCK_IOERR,
- wxSOCKET_INVADDR = GSOCK_INVADDR,
- wxSOCKET_INVSOCK = GSOCK_INVSOCK,
- wxSOCKET_NOHOST = GSOCK_NOHOST,
- wxSOCKET_INVPORT = GSOCK_INVPORT,
- wxSOCKET_WOULDBLOCK = GSOCK_WOULDBLOCK,
- wxSOCKET_TIMEDOUT = GSOCK_TIMEDOUT,
- wxSOCKET_MEMERR = GSOCK_MEMERR,
-
- // wxSocket-specific (not yet implemented)
- wxSOCKET_DUMMY
+ wxSOCKET_NOERROR = 0,
+ wxSOCKET_INVOP,
+ wxSOCKET_IOERR,
+ wxSOCKET_INVADDR,
+ wxSOCKET_INVSOCK,
+ wxSOCKET_NOHOST,
+ wxSOCKET_INVPORT,
+ wxSOCKET_WOULDBLOCK,
+ wxSOCKET_TIMEDOUT,
+ wxSOCKET_MEMERR,
+ wxSOCKET_OPTERR
};
+// socket options/flags bit masks
enum
{
- wxSOCKET_NONE = 0,
- wxSOCKET_NOWAIT = 1,
- wxSOCKET_WAITALL = 2,
- wxSOCKET_BLOCK = 4
+ wxSOCKET_NONE = 0,
+ wxSOCKET_NOWAIT = 1,
+ wxSOCKET_WAITALL = 2,
+ wxSOCKET_BLOCK = 4,
+ wxSOCKET_REUSEADDR = 8,
+ wxSOCKET_BROADCAST = 16,
+ wxSOCKET_NOBIND = 32
};
+typedef int wxSocketFlags;
+
+// socket kind values (badly defined, don't use)
enum wxSocketType
{
- wxSOCKET_UNINIT,
- wxSOCKET_CLIENT,
- wxSOCKET_SERVER,
- wxSOCKET_BASE,
- wxSOCKET_DATAGRAM
+ wxSOCKET_UNINIT,
+ wxSOCKET_CLIENT,
+ wxSOCKET_SERVER,
+ wxSOCKET_BASE,
+ wxSOCKET_DATAGRAM
};
-typedef int wxSocketFlags;
-
-
-#if WXWIN_COMPATIBILITY
- typedef wxSocketType wxSockType;
- typedef wxSocketFlags wxSockFlags;
-#endif // WXWIN_COMPATIBILITY
+// event
+class WXDLLIMPEXP_FWD_NET wxSocketEvent;
+wxDECLARE_EXPORTED_EVENT(WXDLLIMPEXP_NET, wxEVT_SOCKET, wxSocketEvent);
// --------------------------------------------------------------------------
// wxSocketBase
// --------------------------------------------------------------------------
-class WXDLLEXPORT wxSocketBase : public wxObject
+class WXDLLIMPEXP_NET wxSocketBase : public wxObject
{
- DECLARE_CLASS(wxSocketBase)
-
-public:
-
-#if WXWIN_COMPATIBILITY
- enum
- {
- NONE = wxSOCKET_NONE,
- NOWAIT = wxSOCKET_NOWAIT,
- WAITALL = wxSOCKET_WAITALL,
- SPEED = wxSOCKET_BLOCK
- };
-
- enum
- {
- SOCK_UNINIT = wxSOCKET_UNINIT,
- SOCK_CLIENT = wxSOCKET_CLIENT,
- SOCK_SERVER = wxSOCKET_SERVER,
- SOCK_INTERNAL = wxSOCKET_BASE,
- SOCK_DATAGRAM = wxSOCKET_DATAGRAM
- };
-
- typedef void (*wxSockCbk)(wxSocketBase& sock, wxSocketNotify evt, char *cdata);
-#endif // WXWIN_COMPATIBILITY
-
public:
-
- // Public interface
- // ----------------
-
- // ctors and dtors
- wxSocketBase();
- wxSocketBase(wxSocketFlags flags, wxSocketType type);
- virtual ~wxSocketBase();
- void Init();
- bool Destroy();
-
- // state
- inline bool Ok() const { return (m_socket != NULL); };
- inline bool Error() const { return m_error; };
- inline bool IsConnected() const { return m_connected; };
- inline bool IsData() { return WaitForRead(0, 0); };
- inline bool IsDisconnected() const { return !IsConnected(); };
- inline wxUint32 LastCount() const { return m_lcount; }
- inline wxSocketError LastError() const { return (wxSocketError)GSocket_GetError(m_socket); }
- void SaveState();
- void RestoreState();
-
- // addresses
- virtual bool GetLocal(wxSockAddress& addr_man) const;
- virtual bool GetPeer(wxSockAddress& addr_man) const;
-
- // base IO
- virtual bool Close();
- wxSocketBase& Discard();
- wxSocketBase& Peek(void* buffer, wxUint32 nbytes);
- wxSocketBase& Read(void* buffer, wxUint32 nbytes);
- wxSocketBase& ReadMsg(void *buffer, wxUint32 nbytes);
- wxSocketBase& Unread(const void *buffer, wxUint32 nbytes);
- wxSocketBase& Write(const void *buffer, wxUint32 nbytes);
- wxSocketBase& WriteMsg(const void *buffer, wxUint32 nbytes);
-
- void InterruptWait() { m_interrupt = TRUE; };
- bool Wait(long seconds = -1, long milliseconds = 0);
- bool WaitForRead(long seconds = -1, long milliseconds = 0);
- bool WaitForWrite(long seconds = -1, long milliseconds = 0);
- bool WaitForLost(long seconds = -1, long milliseconds = 0);
-
- inline wxSocketFlags GetFlags() const { return m_flags; }
- void SetFlags(wxSocketFlags flags);
- void SetTimeout(long seconds);
-
- // event handling
- void *GetClientData() const { return m_clientData; }
- void SetClientData(void *data) { m_clientData = data; }
- void SetEventHandler(wxEvtHandler& handler, int id = -1);
- void SetNotify(wxSocketEventFlags flags);
- void Notify(bool notify);
-
- // initialize/shutdown the sockets (usually called automatically)
- static bool IsInitialized();
- static bool Initialize();
- static void Shutdown();
-
- // callbacks are deprecated, use events instead
-#if WXWIN_COMPATIBILITY
- wxSockCbk Callback(wxSockCbk cbk_);
- char *CallbackData(char *data);
-#endif // WXWIN_COMPATIBILITY
-
-
- // Implementation from now on
- // --------------------------
-
- // do not use, should be private (called from GSocket)
- void OnRequest(wxSocketNotify notify);
-
- // do not use, not documented nor supported
- inline bool IsNoWait() const { return ((m_flags & wxSOCKET_NOWAIT) != 0); }
- inline wxSocketType GetType() const { return m_type; }
+ // Public interface
+ // ----------------
+
+ // ctors and dtors
+ wxSocketBase();
+ wxSocketBase(wxSocketFlags flags, wxSocketType type);
+ virtual ~wxSocketBase();
+ void Init();
+ bool Destroy();
+
+ // state
+ bool Ok() const { return IsOk(); }
+ bool IsOk() const { return m_impl != NULL; }
+ bool Error() const { return LastError() != wxSOCKET_NOERROR; }
+ bool IsClosed() const { return m_closed; }
+ bool IsConnected() const { return m_connected; }
+ bool IsData() { return WaitForRead(0, 0); }
+ bool IsDisconnected() const { return !IsConnected(); }
+ wxUint32 LastCount() const { return m_lcount; }
+ wxSocketError LastError() const;
+ void SaveState();
+ void RestoreState();
+
+ // addresses
+ virtual bool GetLocal(wxSockAddress& addr_man) const;
+ virtual bool GetPeer(wxSockAddress& addr_man) const;
+ virtual bool SetLocal(const wxIPV4address& local);
+
+ // base IO
+ virtual bool Close();
+ void ShutdownOutput();
+ wxSocketBase& Discard();
+ wxSocketBase& Peek(void* buffer, wxUint32 nbytes);
+ wxSocketBase& Read(void* buffer, wxUint32 nbytes);
+ wxSocketBase& ReadMsg(void *buffer, wxUint32 nbytes);
+ wxSocketBase& Unread(const void *buffer, wxUint32 nbytes);
+ wxSocketBase& Write(const void *buffer, wxUint32 nbytes);
+ wxSocketBase& WriteMsg(const void *buffer, wxUint32 nbytes);
+
+ // all Wait() functions wait until their condition is satisfied or the
+ // timeout expires; if seconds == -1 (default) then m_timeout value is used
+ //
+ // it is also possible to call InterruptWait() to cancel any current Wait()
+
+ // wait for anything at all to happen with this socket
+ bool Wait(long seconds = -1, long milliseconds = 0);
+
+ // wait until we can read from or write to the socket without blocking
+ // (notice that this does not mean that the operation will succeed but only
+ // that it will return immediately)
+ bool WaitForRead(long seconds = -1, long milliseconds = 0);
+ bool WaitForWrite(long seconds = -1, long milliseconds = 0);
+
+ // wait until the connection is terminated
+ bool WaitForLost(long seconds = -1, long milliseconds = 0);
+
+ void InterruptWait() { m_interrupt = true; }
+
+
+ wxSocketFlags GetFlags() const { return m_flags; }
+ void SetFlags(wxSocketFlags flags);
+ virtual void SetTimeout(long seconds);
+ long GetTimeout() const { return m_timeout; }
+
+ bool GetOption(int level, int optname, void *optval, int *optlen);
+ bool SetOption(int level, int optname, const void *optval, int optlen);
+ wxUint32 GetLastIOSize() const { return m_lcount; }
+
+ // event handling
+ void *GetClientData() const { return m_clientData; }
+ void SetClientData(void *data) { m_clientData = data; }
+ void SetEventHandler(wxEvtHandler& handler, int id = wxID_ANY);
+ void SetNotify(wxSocketEventFlags flags);
+ void Notify(bool notify);
+
+ // initialize/shutdown the sockets (done automatically so there is no need
+ // to call these functions usually)
+ //
+ // should always be called from the main thread only so one of the cases
+ // where they should indeed be called explicitly is when the first wxSocket
+ // object in the application is created in a different thread
+ static bool Initialize();
+ static void Shutdown();
+
+ // check if wxSocket had been already initialized
+ //
+ // notice that this function should be only called from the main thread as
+ // otherwise it is inherently unsafe because Initialize/Shutdown() may be
+ // called concurrently with it in the main thread
+ static bool IsInitialized();
+
+ // Implementation from now on
+ // --------------------------
+
+ // do not use, should be private (called from wxSocketImpl only)
+ void OnRequest(wxSocketNotify notify);
+
+ // do not use, not documented nor supported
+ bool IsNoWait() const { return ((m_flags & wxSOCKET_NOWAIT) != 0); }
+ wxSocketType GetType() const { return m_type; }
private:
- friend class wxSocketClient;
- friend class wxSocketServer;
- friend class wxDatagramSocket;
-
- // low level IO
- wxUint32 _Read(void* buffer, wxUint32 nbytes);
- wxUint32 _Write(const void *buffer, wxUint32 nbytes);
- bool _Wait(long seconds, long milliseconds, wxSocketEventFlags flags);
-
- // pushback buffer
- void Pushback(const void *buffer, wxUint32 size);
- wxUint32 GetPushback(void *buffer, wxUint32 size, bool peek);
+ friend class wxSocketClient;
+ friend class wxSocketServer;
+ friend class wxDatagramSocket;
+
+ // low level IO
+ wxUint32 DoRead(void* buffer, wxUint32 nbytes);
+ wxUint32 DoWrite(const void *buffer, wxUint32 nbytes);
+
+ // wait until the given flags are set for this socket or the given timeout
+ // (or m_timeout) expires
+ //
+ // notice that wxSOCKET_LOST_FLAG is always taken into account and the
+ // function returns -1 if the connection was lost; otherwise it returns
+ // true if any of the events specified by flags argument happened or false
+ // if the timeout expired
+ int DoWait(long timeout, wxSocketEventFlags flags);
+
+ // a helper calling DoWait() using the same convention as the public
+ // WaitForXXX() functions use, i.e. use our timeout if seconds == -1 or the
+ // specified timeout otherwise
+ int DoWait(long seconds, long milliseconds, wxSocketEventFlags flags);
+
+ // another helper calling DoWait() using our m_timeout
+ int DoWaitWithTimeout(wxSocketEventFlags flags)
+ {
+ return DoWait(m_timeout*1000, flags);
+ }
+
+ // pushback buffer
+ void Pushback(const void *buffer, wxUint32 size);
+ wxUint32 GetPushback(void *buffer, wxUint32 size, bool peek);
+
+ // store the given error as the LastError()
+ void SetError(wxSocketError error);
private:
- // socket
- GSocket *m_socket; // GSocket
- wxSocketType m_type; // wxSocket type
-
- // state
- wxSocketFlags m_flags; // wxSocket flags
- bool m_connected; // connected?
- bool m_establishing; // establishing connection?
- bool m_reading; // busy reading?
- bool m_writing; // busy writing?
- bool m_error; // did last IO call fail?
- wxSocketError m_lasterror; // last error (not cleared on success)
- wxUint32 m_lcount; // last IO transaction size
- unsigned long m_timeout; // IO timeout value
- wxList m_states; // stack of states
- bool m_interrupt; // interrupt ongoing wait operations?
- bool m_beingDeleted; // marked for delayed deletion?
-
- // pushback buffer
- void *m_unread; // pushback buffer
- wxUint32 m_unrd_size; // pushback buffer size
- wxUint32 m_unrd_cur; // pushback pointer (index into buffer)
-
- // events
- int m_id; // socket id
- wxEvtHandler *m_handler; // event handler
- void *m_clientData; // client data for events
- bool m_notify; // notify events to users?
- wxSocketEventFlags m_eventmask; // which events to notify?
-
- // the initialization count, GSocket is initialized if > 0
- static size_t m_countInit;
-
- // callbacks are deprecated, use events instead
-#if WXWIN_COMPATIBILITY
- wxSockCbk m_cbk; // callback
- char *m_cdata; // callback data
-#endif // WXWIN_COMPATIBILITY
+ // socket
+ wxSocketImpl *m_impl; // port-specific implementation
+ wxSocketType m_type; // wxSocket type
+
+ // state
+ wxSocketFlags m_flags; // wxSocket flags
+ bool m_connected; // connected?
+ bool m_establishing; // establishing connection?
+ bool m_reading; // busy reading?
+ bool m_writing; // busy writing?
+ bool m_closed; // was the other end closed?
+ wxUint32 m_lcount; // last IO transaction size
+ unsigned long m_timeout; // IO timeout value in seconds
+ // (TODO: remove, wxSocketImpl has it too)
+ wxList m_states; // stack of states (TODO: remove!)
+ bool m_interrupt; // interrupt ongoing wait operations?
+ bool m_beingDeleted; // marked for delayed deletion?
+ wxIPV4address m_localAddress; // bind to local address?
+
+ // pushback buffer
+ void *m_unread; // pushback buffer
+ wxUint32 m_unrd_size; // pushback buffer size
+ wxUint32 m_unrd_cur; // pushback pointer (index into buffer)
+
+ // events
+ int m_id; // socket id
+ wxEvtHandler *m_handler; // event handler
+ void *m_clientData; // client data for events
+ bool m_notify; // notify events to users?
+ wxSocketEventFlags m_eventmask; // which events to notify?
+ wxSocketEventFlags m_eventsgot; // collects events received in OnRequest()
+
+
+ friend class wxSocketReadGuard;
+ friend class wxSocketWriteGuard;
+
+ wxDECLARE_NO_COPY_CLASS(wxSocketBase);
+ DECLARE_CLASS(wxSocketBase)
};
// wxSocketServer
// --------------------------------------------------------------------------
-class WXDLLEXPORT wxSocketServer : public wxSocketBase
+class WXDLLIMPEXP_NET wxSocketServer : public wxSocketBase
{
- DECLARE_CLASS(wxSocketServer)
-
public:
- wxSocketServer(wxSockAddress& addr, wxSocketFlags flags = wxSOCKET_NONE);
+ wxSocketServer(const wxSockAddress& addr,
+ wxSocketFlags flags = wxSOCKET_NONE);
+
+ wxSocketBase* Accept(bool wait = true);
+ bool AcceptWith(wxSocketBase& socket, bool wait = true);
- wxSocketBase* Accept(bool wait = TRUE);
- bool AcceptWith(wxSocketBase& socket, bool wait = TRUE);
+ bool WaitForAccept(long seconds = -1, long milliseconds = 0);
- bool WaitForAccept(long seconds = -1, long milliseconds = 0);
+ wxDECLARE_NO_COPY_CLASS(wxSocketServer);
+ DECLARE_CLASS(wxSocketServer)
};
// wxSocketClient
// --------------------------------------------------------------------------
-class WXDLLEXPORT wxSocketClient : public wxSocketBase
+class WXDLLIMPEXP_NET wxSocketClient : public wxSocketBase
{
- DECLARE_CLASS(wxSocketClient)
-
public:
- wxSocketClient(wxSocketFlags flags = wxSOCKET_NONE);
- virtual ~wxSocketClient();
+ wxSocketClient(wxSocketFlags flags = wxSOCKET_NONE);
+
+ virtual bool Connect(const wxSockAddress& addr, bool wait = true);
+ bool Connect(const wxSockAddress& addr,
+ const wxSockAddress& local,
+ bool wait = true);
+
+ bool WaitOnConnect(long seconds = -1, long milliseconds = 0);
+
+ // Sets initial socket buffer sizes using the SO_SNDBUF and SO_RCVBUF
+ // options before calling connect (either one can be -1 to leave it
+ // unchanged)
+ void SetInitialSocketBuffers(int recv, int send)
+ {
+ m_initialRecvBufferSize = recv;
+ m_initialSendBufferSize = send;
+ }
+
+private:
+ virtual bool DoConnect(const wxSockAddress& addr,
+ const wxSockAddress* local,
+ bool wait = true);
- virtual bool Connect(wxSockAddress& addr, bool wait = TRUE);
+ // buffer sizes, -1 if unset and defaults should be used
+ int m_initialRecvBufferSize;
+ int m_initialSendBufferSize;
- bool WaitOnConnect(long seconds = -1, long milliseconds = 0);
+ wxDECLARE_NO_COPY_CLASS(wxSocketClient);
+ DECLARE_CLASS(wxSocketClient)
};
// WARNING: still in alpha stage
-class WXDLLEXPORT wxDatagramSocket : public wxSocketBase
+class WXDLLIMPEXP_NET wxDatagramSocket : public wxSocketBase
{
- DECLARE_CLASS(wxDatagramSocket)
-
public:
- wxDatagramSocket(wxSockAddress& addr, wxSocketFlags flags = wxSOCKET_NONE);
-
- wxDatagramSocket& RecvFrom( wxSockAddress& addr,
- void* buf,
- wxUint32 nBytes );
- wxDatagramSocket& SendTo( wxSockAddress& addr,
- const void* buf,
- wxUint32 nBytes );
-
-/* TODO:
- bool Connect(wxSockAddress& addr);
-*/
+ wxDatagramSocket(const wxSockAddress& addr,
+ wxSocketFlags flags = wxSOCKET_NONE);
+
+ wxDatagramSocket& RecvFrom(wxSockAddress& addr,
+ void *buf,
+ wxUint32 nBytes);
+ wxDatagramSocket& SendTo(const wxSockAddress& addr,
+ const void* buf,
+ wxUint32 nBytes);
+
+ /* TODO:
+ bool Connect(wxSockAddress& addr);
+ */
+
+private:
+ wxDECLARE_NO_COPY_CLASS(wxDatagramSocket);
+ DECLARE_CLASS(wxDatagramSocket)
};
// wxSocketEvent
// --------------------------------------------------------------------------
-class WXDLLEXPORT wxSocketEvent : public wxEvent
+class WXDLLIMPEXP_NET wxSocketEvent : public wxEvent
{
public:
- wxSocketEvent(int id = 0)
- : wxEvent(id, wxEVT_SOCKET)
- {
- }
-
- wxSocketNotify GetSocketEvent() const { return m_event; }
- wxSocketBase *GetSocket() const { return (wxSocketBase *) GetEventObject(); }
- void *GetClientData() const { return m_clientData; }
+ wxSocketEvent(int id = 0)
+ : wxEvent(id, wxEVT_SOCKET)
+ {
+ }
- // backwards compatibility
-#if WXWIN_COMPATIBILITY_2
- wxSocketNotify SocketEvent() const { return m_event; }
- wxSocketBase *Socket() const { return (wxSocketBase *) GetEventObject(); }
-#endif // WXWIN_COMPATIBILITY_2
+ wxSocketNotify GetSocketEvent() const { return m_event; }
+ wxSocketBase *GetSocket() const
+ { return (wxSocketBase *) GetEventObject(); }
+ void *GetClientData() const { return m_clientData; }
- virtual wxEvent *Clone() const { return new wxSocketEvent(*this); }
+ virtual wxEvent *Clone() const { return new wxSocketEvent(*this); }
+ virtual wxEventCategory GetEventCategory() const { return wxEVT_CATEGORY_SOCKET; }
public:
- wxSocketNotify m_event;
- void *m_clientData;
+ wxSocketNotify m_event;
+ void *m_clientData;
- DECLARE_DYNAMIC_CLASS(wxSocketEvent)
+ DECLARE_DYNAMIC_CLASS_NO_ASSIGN(wxSocketEvent)
};
typedef void (wxEvtHandler::*wxSocketEventFunction)(wxSocketEvent&);
+#define wxSocketEventHandler(func) \
+ wxEVENT_HANDLER_CAST(wxSocketEventFunction, func)
+
#define EVT_SOCKET(id, func) \
- DECLARE_EVENT_TABLE_ENTRY( wxEVT_SOCKET, id, -1, \
- (wxObjectEventFunction) \
- (wxEventFunction) \
- (wxSocketEventFunction) & func, \
- (wxObject *) NULL ),
+ wx__DECLARE_EVT1(wxEVT_SOCKET, id, wxSocketEventHandler(func))
+#endif // wxUSE_SOCKETS
-#endif
- // wxUSE_SOCKETS
+#endif // _WX_SOCKET_H_
-#endif
- // _WX_NETWORK_SOCKET_H
projects / wxWidgets.git / blobdiff