RE: sftp_read receives EOF on second call for a 24kb file

["Kevin Lambert" <klambert@xxxxxxxxx>]

That is what I was asking about.  I have a 24kb file that I was trying to transfer in 1kb chunks, transferred 1kb without a problem but on my second call to sftp_read there was a SSH_FX_EOF received at line 1802 in sftp.c (version 0.5.5).  I built this with openssl 1.0.1.  The reason I sent the ssh_session init along with the sftp code was incase there was something I was doing wrong in the ssh session initialization to cause this.

My read loop is as such:

  char buffer[1024];
  size_t length = sizeof(buffer);
  size_t totalLength = 0;
    size_t count = 0;

    count = sftp_read(file, buffer, length);

    while ( count > 0 ) {

      if ( destFile.is_open() ) {
        destFile.write(buffer, length);
      }

      totalLength += count;

      count = sftp_read(file, buffer, length);
    }

Kevin

-----Original Message-----
From: Aris Adamantiadis [mailto:aris@xxxxxxxxxxxx] 
Sent: Wednesday, October 23, 2013 7:47 AM
To: libssh@xxxxxxxxxx
Subject: Re: sftp_read receives EOF on second call for a 24kb file

Hi Andreas,

I think Kevin complained that sftp_read returned an EOF condition when the file was not fully read, and if it does it's a bug in libssh.

Aris

Le 23/10/13 09:53, Andreas Schneider a écrit :
> On Tuesday 22 October 2013 18:58:17 Darren wrote:
>>  Hi Kevin,
>>
>> Assuming remote to local transfer:
>>
>> You read the first chunk of data, and use sftp_seek to move the file 
>> pointer
>>
> 
> There is absolutely no need to call sftp_seek() you only need it if 
> you resume a transfer. The API works the same way as the POSIX API. 
> Files should be transferred in small chunks.
> 
> #define MAX_XFER_BUF_SIZE 16384
> 
> char buf[MAX_XFER_BUF_SIZE];
> 
> file = sftp_open(sftp, path, O_RDONLY, 0);
> 
> for (;;) {
> 	bytesread = sftp_read(file, buf, MAX_XFER_BUF_SIZE);
> 	if (bytesread == 0) {
> 		break; /* EOF */
> 	} else if (bytesread < 0) {
> 		/* ERROR HANDLING */
> 	}
> 
> 	byteswritten = write(fd, buf, MAX_XFER_BUF_SIZE)
> 	if (byteswritten != bytesread) {
> 		/* ERROR */
> 	}
> }
> 
> This way I can transfer files which are several gigabyte of size.
> 
> 
> 	-- andreas
>