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src/flash.c

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+/*
+ * flash.c -- Data Objects (DO) and GPG Key handling on Flash ROM
+ *
+ * Copyright (C) 2010 Free Software Initiative of Japan
+ * Author: NIIBE Yutaka <gniibe@fsij.org>
+ *
+ * This file is a part of Gnuk, a GnuPG USB Token implementation.
+ *
+ * Gnuk is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Gnuk is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+ * License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "ch.h"
+#include "gnuk.h"
+
+uint8_t *
+flash_do_write (uint16_t tag, uint8_t *data, int len)
+{
+  static uint8_t do_pool[1024];
+  static uint8_t *last_p = do_pool;
+  uint8_t *p = last_p;
+
+  if (last_p - do_pool + len + 2 + 3 > 1024)
+    return NULL;
+
+  *last_p++ = (tag >> 8);
+  *last_p++ = (tag & 0xff);
+  if (len < 128)
+    *last_p++ = len;
+  else if (len < 256)
+    {
+      *last_p++ = 0x81;
+      *last_p++ = len;
+    }
+  else
+    {
+      *last_p++ = 0x82;
+      *last_p++ = (len >> 8);
+      *last_p++ = (len & 0xff);
+    }
+  memcpy (last_p, data, len);
+  last_p += len;
+
+  return p + 2;
+}