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sftp_read: cap the read ahead maximum amount

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Now we only go up to LIBSSH2_CHANNEL_WINDOW_DEFAULT*30 bytes SFTP read
ahead, which currently equals 64K*30 == 1966080 bytes.
This commit is contained in:
Daniel Stenberg
2011-09-08 22:47:38 +02:00
parent 81bdcf61f3
commit 10b66cef08
1 changed files with 6 additions and 2 deletions
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8
src/sftp.c
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@@ -1110,10 +1110,14 @@ static ssize_t sftp_read(LIBSSH2_SFTP_HANDLE * handle, char *buffer,
/* We allow a number of bytes being requested at any given time without
having been acked - until we reach EOF. */
if(!filep->eof) {
size_t max_read_ahead = buffer_size*4;
if(max_read_ahead > LIBSSH2_CHANNEL_WINDOW_DEFAULT*30)
max_read_ahead = LIBSSH2_CHANNEL_WINDOW_DEFAULT*30;
/* if the buffer_size passed in now is smaller than what has already
been sent, we risk getting count become a very large number */
if((buffer_size*4) > already)
count = (buffer_size*4) - already;
if(max_read_ahead > already)
count = max_read_ahead - already;
/* 'count' is how much more data to ask for, and 'already' is how much
data that already has been asked for but not yet returned. So, if