Re: Very large files

[Damjan Jovanovic]

I tested it (code to copy a file below, file was > 4
GB) and it works.

I'm using Gentoo 2006.0, Linux 2.6.15.1, ReiserFS 3
and wine 0.9.15.

Can you find out whether the broken code is using
KERNEL32, NTDLL, MSVCRT streams or MSVCRT POSIX-style
open()/read() etc.?

#include <windows.h>
#include <stdio.h>

int main(int argc, char **argv)
{
    HANDLE inputFile = INVALID_HANDLE_VALUE, outputFile =
INVALID_HANDLE_VALUE;
    const int bufferSize = 8*1024;
    char buffer[bufferSize];
    DWORD bytesRead;
    BOOL ok;

if (argc < 3)
    {
    	fprintf(stderr, "Usage: %s source destination\n",
argv[0]);
    	return 1;
    }

inputFile = CreateFile(argv[1], GENERIC_READ,
FILE_SHARE_READ, NULL,
    	OPEN_EXISTING, 0, NULL);
    if (inputFile == INVALID_HANDLE_VALUE)
    {
    	fprintf(stderr, "Error opening %s\n", argv[1]);
    	goto done;
    }

outputFile = CreateFile(argv[2], GENERIC_WRITE, 0,
NULL,
    	CREATE_ALWAYS, 0, NULL);
    if (outputFile == INVALID_HANDLE_VALUE)
    {
    	fprintf(stderr, "Error opening %s\n", argv[2]);
    	goto done;
    }

ok = ReadFile(inputFile, buffer, bufferSize,
&bytesRead, NULL);
    if (!ok)
    {
    	fprintf(stderr, "Error reading file\n");
    	goto done;
    }
    while (bytesRead > 0)
    {
    	DWORD bytesWritten = 0, bytesWrittenNow;
    	do
    	{
    		ok = WriteFile(outputFile, buffer, bytesRead,
&bytesWrittenNow,
    			NULL);
    		if (!ok)
    		{
    			fprintf(stderr, "Error writing file\n");
    			goto done;
    		}
    		bytesWritten += bytesWrittenNow;
    	} while (bytesWritten < bytesRead);

ok = ReadFile(inputFile, buffer, bufferSize,
&bytesRead, NULL);
    	if (!ok)
    	{
    		fprintf(stderr, "Error reading file\n");
    		goto done;
    	}
    };

done:
    if (inputFile != INVALID_HANDLE_VALUE)
    	CloseHandle(inputFile);
    if (outputFile != INVALID_HANDLE_VALUE)
    	CloseHandle(outputFile);
    return 0;
}

--- John Willis  wrote:
> Damjan,
>
> Linux kernel:     2.4.21-20.ELsmp
> Filesystem:        ext3
>
> Thanks for looking into this for me,
>
> John
>
> ----- Original Message ----- 
> From: "Damjan Jovanovic" 
> To: "John Willis" ;
>
> Sent: Sunday, June 25, 2006 11:31 PM
> Subject: Re: Very large files
> > --- John Willis  wrote:
> > > Howdy,
> > >
> > > I have a large VS 6.0 C++ program and I'm running
>
> it
> > > under WINE under Redhat Linux. 
> > > Everything works fine, but it doesn't handle file
> > > sizes greater than 4gb like it can running 
> > > directly under Windows XP. 
> > > I've tweaked everything that I can find that
>
> seems
> > > to deal with file sizes.
> >
> > How do you access the file? With stdio streams
> > (fopen(), fread(), ...), MSVCRT's open()/read(),
>
> or
> > with KERNEL32's CreateFile(), ReadFile(), ... ?
> > > Is there a problem with WINE itself handling very
> > > large file sizes?
> >
> > Which version of the Linux kernel and which
>
> filesystem
> > are you using?
> >
> > I'll run some tests at home and see whether it
>
> works
> > for me.
> > > Thanks in advance,
> > > John>
> >
> > Do You Yahoo!?
> > Tired of spam?  Yahoo! Mail has the best spam
>
> protection around
> > http://mail.yahoo.com

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