bug in recvall

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in

the utility function recvall() has a bug

here the fix

var recvall2:Function = function( socket:int, bytes:ByteArray, len:int = 8192, 
flags:int = 0 ):int
{
    var total:uint = 0; // how many bytes we received
    var n:int;
    var b:ByteArray = new ByteArray();

    var run:Boolean = true;
    while( run )
    {
        b.clear();
        n = recv( socket, b, len, flags );
        if( n == -1 ) { run = false; break; }
        bytes.writeBytes( b );
        total += n;
        if( n == 0 ) { run = false; break; }
    }

    b.clear();

    if( n < 0 )
    {
        return -1; //failure
    }

    return total; // number of bytes actually received
}

the loop need to check on "bytes recv zero"
and not "bytes recv smaller than buffer"

eg.
//if( n < len ) { run = false; break; }  // bad
if( n == 0 ) { run = false; break; }     // good

if you trace( "n = " + n );
on getting an HTTML page you get something like

n = 1448
n = 1448
n = 2896
n = 1448
n = 1448
n = 1448
n = 2896
n = 1448
n = 1448
n = 1448
n = 1448
n = 1448
n = 1448
n = 2896
n = 1534
n = 0

even if the buffer is max=8192 bytes
depending on network settings and other MTU window
we can recevie s,aller chunk than the buffer
which is what create the bug

the real indicator of "all is received" is when we receive zero bytes

Original issue reported on code.google.com by zwetan on 26 Mar 2015 at 8:38