1// Copyright 2016 PDFium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include <limits>
6
7#include "core/fxcrt/fx_basic.h"
8#include "testing/fx_string_testhelpers.h"
9#include "testing/gtest/include/gtest/gtest.h"
10
11namespace {
12
13uint32_t ReferenceGetBits32(const uint8_t* pData, int bitpos, int nbits) {
14  int result = 0;
15  for (int i = 0; i < nbits; i++) {
16    if (pData[(bitpos + i) / 8] & (1 << (7 - (bitpos + i) % 8)))
17      result |= 1 << (nbits - i - 1);
18  }
19  return result;
20}
21
22}  // namespace
23
24TEST(fxge, GetBits32) {
25  unsigned char data[] = {0xDE, 0x3F, 0xB1, 0x7C, 0x12, 0x9A, 0x04, 0x56};
26  for (int nbits = 1; nbits <= 32; ++nbits) {
27    for (int bitpos = 0; bitpos < (int)sizeof(data) * 8 - nbits; ++bitpos) {
28      EXPECT_EQ(ReferenceGetBits32(data, bitpos, nbits),
29                GetBits32(data, bitpos, nbits));
30    }
31  }
32}
33
34TEST(fxcrt, FX_atonum) {
35  int i;
36  EXPECT_TRUE(FX_atonum("10", &i));
37  EXPECT_EQ(10, i);
38
39  EXPECT_TRUE(FX_atonum("-10", &i));
40  EXPECT_EQ(-10, i);
41
42  EXPECT_TRUE(FX_atonum("+10", &i));
43  EXPECT_EQ(10, i);
44
45  EXPECT_TRUE(FX_atonum("-2147483648", &i));
46  EXPECT_EQ(std::numeric_limits<int>::min(), i);
47
48  EXPECT_TRUE(FX_atonum("2147483647", &i));
49  EXPECT_EQ(2147483647, i);
50
51  // Value overflows.
52  EXPECT_TRUE(FX_atonum("-2147483649", &i));
53  EXPECT_EQ(0, i);
54
55  // Value overflows.
56  EXPECT_TRUE(FX_atonum("+2147483648", &i));
57  EXPECT_EQ(0, i);
58
59  // Value overflows.
60  EXPECT_TRUE(FX_atonum("4223423494965252", &i));
61  EXPECT_EQ(0, i);
62
63  // No explicit sign will allow the number to go negative. This is for things
64  // like the encryption Permissions flag (Table 3.20 PDF 1.7 spec)
65  EXPECT_TRUE(FX_atonum("4294965252", &i));
66  EXPECT_EQ(-2044, i);
67
68  EXPECT_TRUE(FX_atonum("-4294965252", &i));
69  EXPECT_EQ(0, i);
70
71  EXPECT_TRUE(FX_atonum("+4294965252", &i));
72  EXPECT_EQ(0, i);
73
74  float f;
75  EXPECT_FALSE(FX_atonum("3.24", &f));
76  EXPECT_FLOAT_EQ(3.24f, f);
77}
78