tftp.c: use symbolic constant for block size

diff --git a/software/bios/tftp.c b/software/bios/tftp.c
index ff34cc2430a5e9a1cba989704628c03806c5ee37..2ceadb94a2fe465a7ff9a2afccd5adff58ca1add 100644 (file)
--- a/software/bios/tftp.c
+++ b/software/bios/tftp.c
@@ -15,6 +15,9 @@ enum {
        TFTP_ERROR      = 5,    /* Error */
 };
 
+#define        BLOCK_SIZE      512     /* block size in bytes */
+
+
 static int format_request(uint8_t *buf, uint16_t op, const char *filename)
 {
        int len = strlen(filename);
@@ -63,11 +66,11 @@ static void rx_callback(uint32_t src_ip, uint16_t src_port,
        if(block < 1) return;
        if(opcode == TFTP_DATA) { /* Data */
                length -= 4;
-               offset = (block-1)*512;
+               offset = (block-1)*BLOCK_SIZE;
                for(i=0;i<length;i++)
                        dst_buffer[offset+i] = data[i+4];
                total_length += length;
-               if(length < 512)
+               if(length < BLOCK_SIZE)
                        transfer_finished = 1;
                
                length = format_ack(packet_data, block);