1 files changed, 95 insertions, 0 deletions
diff --git a/libdw/dwarf_formblock.c b/libdw/dwarf_formblock.c
new file mode 100644
index 00000000..3d56f222
--- /dev/null
+++ b/libdw/dwarf_formblock.c
@@ -0,0 +1,95 @@
+/* Return block represented by attribute.
+   Copyright (C) 2004-2010, 2014 Red Hat, Inc.
+   This file is part of elfutils.
+   Written by Ulrich Drepper <drepper@redhat.com>, 2004.
+
+   This file is free software; you can redistribute it and/or modify
+   it under the terms of either
+
+     * the GNU Lesser General Public License as published by the Free
+       Software Foundation; either version 3 of the License, or (at
+       your option) any later version
+
+   or
+
+     * the GNU General Public License as published by the Free
+       Software Foundation; either version 2 of the License, or (at
+       your option) any later version
+
+   or both in parallel, as here.
+
+   elfutils 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 copies of the GNU General Public License and
+   the GNU Lesser General Public License along with this program.  If
+   not, see <http://www.gnu.org/licenses/>.  */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <dwarf.h>
+#include "libdwP.h"
+
+
+int
+dwarf_formblock (attr, return_block)
+     Dwarf_Attribute *attr;
+     Dwarf_Block *return_block;
+{
+  if (attr == NULL)
+    return -1;
+
+  const unsigned char *datap = attr->valp;
+  const unsigned char *endp = attr->cu->endp;
+
+  switch (attr->form)
+    {
+    case DW_FORM_block1:
+      if (unlikely (endp - datap < 1))
+	goto invalid;
+      return_block->length = *(uint8_t *) attr->valp;
+      return_block->data = attr->valp + 1;
+      break;
+
+    case DW_FORM_block2:
+      if (unlikely (endp - datap < 2))
+	goto invalid;
+      return_block->length = read_2ubyte_unaligned (attr->cu->dbg, attr->valp);
+      return_block->data = attr->valp + 2;
+      break;
+
+    case DW_FORM_block4:
+      if (unlikely (endp - datap < 4))
+	goto invalid;
+      return_block->length = read_4ubyte_unaligned (attr->cu->dbg, attr->valp);
+      return_block->data = attr->valp + 4;
+      break;
+
+    case DW_FORM_block:
+    case DW_FORM_exprloc:
+      if (unlikely (endp - datap < 1))
+	goto invalid;
+      get_uleb128 (return_block->length, datap, endp);
+      return_block->data = (unsigned char *) datap;
+      break;
+
+    default:
+      __libdw_seterrno (DWARF_E_NO_BLOCK);
+      return -1;
+    }
+
+  if (unlikely (return_block->length > (size_t) (endp - return_block->data)))
+    {
+      /* Block does not fit.  */
+    invalid:
+      __libdw_seterrno (DWARF_E_INVALID_DWARF);
+      return -1;
+    }
+
+  return 0;
+}
+INTDEF(dwarf_formblock)