Added guard code to avoid issue when decoding PEM but not keeping data.
[BearSSL] / T0 / CodeElementUIntExpr.cs
1 /*
2 * Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining
5 * a copy of this software and associated documentation files (the
6 * "Software"), to deal in the Software without restriction, including
7 * without limitation the rights to use, copy, modify, merge, publish,
8 * distribute, sublicense, and/or sell copies of the Software, and to
9 * permit persons to whom the Software is furnished to do so, subject to
10 * the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be
13 * included in all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
19 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
20 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
21 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
22 * SOFTWARE.
23 */
24
25 using System;
26
27 class CodeElementUIntExpr : CodeElement {
28
29 uint val;
30 TPointerExpr cx;
31 int off;
32
33 internal CodeElementUIntExpr(uint val,
34 TPointerExpr cx, int off) : base()
35 {
36 this.val = val;
37 this.cx = cx;
38 this.off = off;
39 }
40
41 /* obsolete
42 internal override int Length {
43 get {
44 return Encode7EUnsigned(val, null)
45 + (cx.GetMaxBitLength(off) + 6) / 7;
46 }
47 }
48 */
49
50 internal override int GetLength(bool oneByteCode)
51 {
52 int len = oneByteCode ? 1 : Encode7EUnsigned(val, null);
53 return len + (cx.GetMaxBitLength(off) + 6) / 7;
54 }
55
56 internal override int Encode(BlobWriter bw, bool oneByteCode)
57 {
58 int len1 = oneByteCode
59 ? EncodeOneByte(val, bw)
60 : Encode7EUnsigned(val, bw);
61 int len2 = (cx.GetMaxBitLength(off) + 6) / 7;
62 bw.Append(String.Format("T0_INT{0}({1})",
63 len2, cx.ToCExpr(off)));
64 return len1 + len2;
65 }
66 }