fix hid write back buffering

ctap_device.c

@@ -12,46 +12,12 @@
 #include "usbhid.h"
 
 
-void ctap_write_block(uint8_t * data)
+void ctaphid_write_block(uint8_t * data)
 {
     printf("<< "); dump_hex(data, 64);
     usbhid_send(data);
 }
 
-void ctap_write(void * _data, int len)
-{
-    static uint8_t buf[HID_MESSAGE_SIZE];
-    static int offset = 0;
-
-    uint8_t * data = (uint8_t *) _data;
-
-    if (len == 0)
-    {
-        if (offset > 0)
-        {
-            memset(buf + offset, 0, HID_MESSAGE_SIZE - offset);
-            ctap_write_block(buf);
-        }
-        offset = 0;
-        return;
-    }
-    else if (len == -1)
-    {
-        memset(buf, 0, HID_MESSAGE_SIZE);
-        offset = 0;
-    }
-
-    int i;
-    for (i = 0; i < len; i++)
-    {
-        buf[offset++] = data[i];
-        if (offset == HID_MESSAGE_SIZE)
-        {
-            ctap_write_block(buf);
-            offset = 0;
-        }
-    }
-}
 
 int ctap_user_presence_test()
 {