Leaked source code of windows server 2003
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/*++
Copyright (c) 1994 Microsoft Corporation
Module Name:
buffer.cxx
Abstract:
Contains functions for managing BUFFER_INFO 'objects'
Contents:
CreateBuffer
DestroyBuffer
AcquireBufferLock
ReleaseBufferLock
ReferenceBuffer
DereferenceBuffer
Author:
Richard L Firth (rfirth) 02-Nov-1994
Revision History:
02-Nov-1994 rfirth
Created
--*/
#include <wininetp.h>
#include "gfrapih.h"
//
// data
//
DEBUG_DATA(LONG, NumberOfBuffers, 0);
//
// functions
//
LPBUFFER_INFO
CreateBuffer(
OUT LPDWORD Error
)
/*++
Routine Description:
Creates and initializes a BUFFER_INFO
Arguments:
Error - pointer to returned error
Return Value:
LPBUFFER_INFO
Success - pointer to new BUFFER_INFO
Failure - NULL
--*/
{
LPBUFFER_INFO bufferInfo;
DWORD error;
HANDLE hEvent;
bufferInfo = NEW(BUFFER_INFO);
if (bufferInfo != NULL) {
//
// create an event that is initially unsignalled. The thread that
// creates this buffer info will signal the event when the response
// has been received from the server. At that point, any other
// concurrent requesters can access the data
//
// bufferInfo->RequestEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
// if (bufferInfo->RequestEvent != NULL) {
//bufferInfo->ConnectedSocket.Socket = INVALID_SOCKET;
// InitializeCriticalSection(&bufferInfo->CriticalSection);
bufferInfo->Socket = new ICSocket();
if ( bufferInfo->Socket != NULL )
{
error = ERROR_SUCCESS;
BUFFER_CREATED();
}
else
error = ERROR_NOT_ENOUGH_MEMORY;
// } else {
// error = GetLastError();
// }
} else {
error = ERROR_NOT_ENOUGH_MEMORY;
}
if (error != ERROR_SUCCESS) {
if (bufferInfo != NULL) {
DEL(bufferInfo);
}
*Error = error;
}
return bufferInfo;
}
VOID
DestroyBuffer(
IN LPBUFFER_INFO BufferInfo
)
/*++
Routine Description:
Frees resources belonging to BUFFER_INFO and frees memory occupied by
BUFFER_INFO. BufferInfo must have been removed from any lists first
Arguments:
BufferInfo - pointer to BUFFER_INFO to destroy
Return Value:
None.
--*/
{
DEBUG_ENTER((DBG_GOPHER,
None,
"DestroyBuffer",
"%x",
BufferInfo
));
INET_ASSERT(BufferInfo != NULL);
INET_ASSERT(BufferInfo->ReferenceCount == 0);
// INET_ASSERT(! BufferInfo->Socket->IsValid());
//if (BufferInfo->ConnectedSocket.Socket != INVALID_SOCKET) {
INET_ASSERT(BufferInfo->Socket);
if (BufferInfo->Socket->IsValid()) {
//
// BUGBUG - do we need to set linger or don't linger?
//
//
// close the socket
//
BufferInfo->Socket->Close();
}
BufferInfo->Socket->Dereference();
// if (BufferInfo->RequestEvent != NULL) {
// CloseHandle(BufferInfo->RequestEvent);
// }
//
// if we allocated a buffer for the response then free it
//
if ((BufferInfo->Buffer != NULL)
&& (BufferInfo->Flags & BI_BUFFER_RESPONSE)) {
FREE_FIXED_MEMORY(BufferInfo->Buffer);
}
// DeleteCriticalSection(&BufferInfo->CriticalSection);
DEL(BufferInfo);
BUFFER_DESTROYED();
DEBUG_LEAVE(0);
}
VOID
AcquireBufferLock(
IN LPBUFFER_INFO BufferInfo
)
/*++
Routine Description:
Locks the BUFFER_INFO against simultaneous updates of the Buffer
Arguments:
BufferInfo - pointer to BUFFER_INFO to lock
Return Value:
None.
--*/
{
INET_ASSERT(BufferInfo != NULL);
// EnterCriticalSection(&BufferInfo->CriticalSection);
}
VOID
ReleaseBufferLock(
IN LPBUFFER_INFO BufferInfo
)
/*++
Routine Description:
Opposite of AcquireBufferLock
Arguments:
BufferInfo - pointer to BUFFER_INFO to unlock
Return Value:
None.
--*/
{
INET_ASSERT(BufferInfo != NULL);
// LeaveCriticalSection(&BufferInfo->CriticalSection);
}
VOID
ReferenceBuffer(
IN LPBUFFER_INFO BufferInfo
)
/*++
Routine Description:
Increments the BUFFER_INFO reference count
Arguments:
BufferInfo - pointer to BUFFER_INFO to reference (by 1)
Return Value:
None.
--*/
{
INET_ASSERT(BufferInfo != NULL);
InterlockedIncrement(&BufferInfo->ReferenceCount);
}
LPBUFFER_INFO
DereferenceBuffer(
IN LPBUFFER_INFO BufferInfo
)
/*++
Routine Description:
Reduces the BUFFER_INFO reference count by 1. If the reference count goes
to zero, the BUFFER_INFO is destroyed
Arguments:
BufferInfo - pointer to BUFFER_INFO to dereference/destroy
Return Value:
DWORD
previous value of reference count
--*/
{
INET_ASSERT(BufferInfo != NULL);
INET_ASSERT(BufferInfo->ReferenceCount >= 1);
if (InterlockedDecrement(&BufferInfo->ReferenceCount) == 0) {
DestroyBuffer(BufferInfo);
BufferInfo = NULL;
}
return BufferInfo;
}