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|
/*
+-------------------------------------------------------------------------+
| File Copying Routines |
+-------------------------------------------------------------------------+
| (c) Copyright 1993-1994 |
| Microsoft Corp. |
| All rights reserved |
| |
| Program : [FastCopy.c] |
| Programmer : Arthur Hanson |
| Original Program Date : [Jul 27, 1993] |
| Last Update : [Jun 18, 1994] |
| |
| Version: 1.00 |
| |
| Use multiple threads to whack data from one file to another |
| |
| Modifications: |
| 18-Oct-1990 w-barry Removed 'dead' code. |
| 21-Nov-1990 w-barry Updated API's to the Win32 set. |
| |
+-------------------------------------------------------------------------+
*/
#define INCL_DOSPROCESS
#define INCL_DOSSEMAPHORES
#include "globals.h"
#include <stdio.h>
#include <process.h>
#include <windows.h>
#include <malloc.h>
#include "mem.h"
#include "debug.h"
#include "utils.h"
#include "convapi.h"
#define BUFSIZE 0xFE00 // full segment minus sector
#define STACKSIZE 256 // stack size for child thread
typedef struct BUF BUF;
struct BUF {
BOOL flag;
DWORD cbBuf;
BUF *fpbufNext;
BYTE ach[BUFSIZE];
};
#define LAST TRUE
#define NOTLAST FALSE
static HANDLE hevQNotEmpty;
static CRITICAL_SECTION hcrtQLock;
static BUF *fpbufHead = NULL;
static BUF *fpbufTail = NULL;
static HANDLE hfSrc, hfDst;
static HANDLE hThread;
static BOOLEAN fAbort;
// forward type definitions
LPTSTR writer( void );
DWORD reader( void );
BUF *dequeue( void );
void enqueue( BUF *fpbuf );
TCHAR *fastcopy( HANDLE hfSrcParm, HANDLE hfDstParm );
/*+-------------------------------------------------------------------------+
| writer()
|
+-------------------------------------------------------------------------+*/
LPTSTR writer ( void ) {
BUF *fpbuf;
DWORD cbBytesOut;
BOOL f = !LAST;
LPTSTR npsz = NULL;
ULONG BytesCopied = 0;
TCHAR buffer[MAX_PATH];
Status_Bytes(lToStr(BytesCopied));
while (f != LAST && npsz == NULL) {
fpbuf = dequeue ();
if (fpbuf) {
if ((f = fpbuf->flag) != LAST) {
if (!WriteFile(hfDst, fpbuf->ach, fpbuf->cbBuf, &cbBytesOut, NULL)) {
npsz = Lids(IDS_L_4);
#ifdef DEBUG
dprintf(TEXT("ERROR: WriteFile\n"));
#endif
} else {
BytesCopied += cbBytesOut;
Status_Bytes(lToStr(BytesCopied));
if (cbBytesOut != (DWORD)fpbuf->cbBuf) {
npsz = Lids(IDS_L_5);
#ifdef DEBUG
dprintf(TEXT("ERROR: WriteFile: out-of-space\n"));
#endif
}
}
}
else
npsz = *(LPTSTR *)fpbuf->ach;
FreeMemory(fpbuf);
} else {
wsprintf (buffer, Lids(IDS_L_4), fpbuf);
#ifdef DEBUG
dprintf(TEXT("ERROR: WriteFile - FileBuffer is NULL\n"));
#endif
}
}
if (f != LAST)
fAbort = TRUE;
WaitForSingleObject(hThread, (DWORD)-1);
CloseHandle(hThread);
CloseHandle(hevQNotEmpty);
DeleteCriticalSection(&hcrtQLock);
return (npsz);
} // writer
/*+-------------------------------------------------------------------------+
| reader()
|
+-------------------------------------------------------------------------+*/
DWORD reader( void ) {
BUF *fpbuf;
BOOL f = !LAST;
while (!fAbort && f != LAST) {
if ((fpbuf = AllocMemory(sizeof(BUF))) == NULL) {
#ifdef DEBUG
dprintf(TEXT("ERROR: MemoryAlloc error %ld\n"), GetLastError());
#endif
return(0);
}
f = fpbuf->flag = NOTLAST;
if (!ReadFile(hfSrc, fpbuf->ach, BUFSIZE, &fpbuf->cbBuf, NULL) || fpbuf->cbBuf == 0) {
f = fpbuf->flag = LAST;
*(LPTSTR *)(fpbuf->ach) = NULL;
}
enqueue (fpbuf);
}
return(0);
} // reader
/*+-------------------------------------------------------------------------+
| dequeue()
|
+-------------------------------------------------------------------------+*/
BUF *dequeue( void ) {
BUF *fpbuf;
while (TRUE) {
if (fpbufHead != NULL) {
EnterCriticalSection(&hcrtQLock);
fpbufHead = (fpbuf = fpbufHead)->fpbufNext;
if (fpbufTail == fpbuf)
fpbufTail = NULL;
LeaveCriticalSection(&hcrtQLock);
break;
}
// the head pointer is null so the list is empty. Block on eventsem
// until enqueue posts (ie. adds to queue)
WaitForSingleObject(hevQNotEmpty, (DWORD)-1);
}
return fpbuf;
} // dequeue
/*+-------------------------------------------------------------------------+
| enqueue()
|
+-------------------------------------------------------------------------+*/
void enqueue( BUF *fpbuf ) {
fpbuf->fpbufNext = NULL;
EnterCriticalSection(&hcrtQLock);
if (fpbufTail == NULL)
fpbufHead = fpbuf;
else
fpbufTail->fpbufNext = fpbuf;
fpbufTail = fpbuf;
LeaveCriticalSection(&hcrtQLock);
SetEvent(hevQNotEmpty);
} // enqueue
/*+-------------------------------------------------------------------------+
| fastcopy()
|
| hfSrcParm file handle to read from
| hfDstParm file handle to write to
|
| returns NULL if successful
| pointer to error string otherwise
+-------------------------------------------------------------------------+*/
TCHAR *fastcopy (HANDLE hfSrcParm, HANDLE hfDstParm) {
DWORD dwReader;
hfSrc = hfSrcParm;
hfDst = hfDstParm;
hevQNotEmpty = CreateEvent(NULL, (BOOL)FALSE, (BOOL)FALSE, NULL);
if (hevQNotEmpty == INVALID_HANDLE_VALUE)
return NULL;
InitializeCriticalSection(&hcrtQLock);
fAbort = FALSE;
hThread = CreateThread(0, STACKSIZE, (LPTHREAD_START_ROUTINE)reader, 0, 0, &dwReader);
if (hThread == INVALID_HANDLE_VALUE) {
#ifdef DEBUG
dprintf(TEXT("ERROR: Can't create thread - FileCopy\n"));
#endif
return Lids(IDS_L_6);
}
return(writer());
} // fastcopy
|
