--- ADFS::Rik2.$.riscos.src-iyo-dev/5/27/tar.TungstenDev.apache.RiscOS.Sources.Networking.Omni.Protocols.LanManFS.c.SMB	2018-11-16 12:03:49.0 +0000
+++ ADFS::Rik2.$.riscos.apache.RiscOS.Sources.Networking.Omni.Protocols.LanManFS.c.SMB	2018-11-16 12:03:49.0 +0000
@@ -111,6 +111,12 @@
 #define WRRAW_BLOCK_SIZE  16384
 #define PRN_BLOCK_SIZE    1024
 
+/*
+ * SMB packet size as defined in smbd/reply.c
+*/
+#define SMB_SIZE        39
+#define MAX_RX_DATA_SIZE        (MAX_RX_BLOCK_SIZE - (SMB_SIZE + 5*2 + 3))
+
 /* This structure relies on Norcroft C packing the bytes & words
    properly!
  */
@@ -2619,7 +2625,7 @@ err_t SMB_Read ( int FH, uint offset, ui
   while ( len_left > 0 )
   {
     SMB_TxWords[0] = fid;
-    SMB_TxWords[1] = min(len_left, MAX_RX_BLOCK_SIZE);
+    SMB_TxWords[1] = min(len_left, MAX_RX_DATA_SIZE);   // was MAX_RX_BLOCK_SIZE
     SMB_TxWords[2] = offset & 0xFFFF;
     SMB_TxWords[3] = (offset >> 16 );
     SMB_TxWords[4] = (len_left);
@@ -2648,7 +2654,7 @@ err_t SMB_Read ( int FH, uint offset, ui
 
     FreeChain(pB_res);
 
-    if ( n_read < MAX_RX_BLOCK_SIZE )  /* Reached end of file */
+    if ( n_read < MAX_RX_DATA_SIZE )  /* Reached end of file */ // was MAX_RX_BLOCK_SIZE
       break;
   }