summaryrefslogtreecommitdiff
path: root/core/fpdfapi/parser/cpdf_parser_unittest.cpp
blob: 3518f7d16bf54a41084d6eba8606ab82d10fc205 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
// Copyright 2015 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include <limits>
#include <string>

#include "core/fpdfapi/parser/cpdf_parser.h"
#include "core/fpdfapi/parser/cpdf_syntax_parser.h"
#include "core/fxcrt/cfx_retain_ptr.h"
#include "core/fxcrt/fx_ext.h"
#include "core/fxcrt/fx_stream.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "testing/utils/path_service.h"

// Provide a way to read test data from a buffer instead of a file.
class CFX_TestBufferRead : public IFX_SeekableReadStream {
 public:
  static CFX_RetainPtr<CFX_TestBufferRead> Create(
      const unsigned char* buffer_in,
      size_t buf_size) {
    return CFX_RetainPtr<CFX_TestBufferRead>(
        new CFX_TestBufferRead(buffer_in, buf_size));
  }

  // IFX_SeekableReadStream:
  bool ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override {
    if (offset < 0 || offset + size > total_size_)
      return false;

    memcpy(buffer, buffer_ + offset, size);
    return true;
  }

  FX_FILESIZE GetSize() override { return (FX_FILESIZE)total_size_; };

 protected:
  CFX_TestBufferRead(const unsigned char* buffer_in, size_t buf_size)
      : buffer_(buffer_in), total_size_(buf_size) {}

  const unsigned char* buffer_;
  size_t total_size_;
};

// A wrapper class to help test member functions of CPDF_Parser.
class CPDF_TestParser : public CPDF_Parser {
 public:
  CPDF_TestParser() {}
  ~CPDF_TestParser() {}

  // Setup reading from a file and initial states.
  bool InitTestFromFile(const FX_CHAR* path) {
    CFX_RetainPtr<IFX_SeekableReadStream> pFileAccess =
        IFX_SeekableReadStream::CreateFromFilename(path);
    if (!pFileAccess)
      return false;

    // For the test file, the header is set at the beginning.
    m_pSyntax->InitParser(pFileAccess, 0);
    return true;
  }

  // Setup reading from a buffer and initial states.
  bool InitTestFromBuffer(const unsigned char* buffer, size_t len) {
    CFX_RetainPtr<CFX_TestBufferRead> buffer_reader =
        CFX_TestBufferRead::Create(buffer, len);

    // For the test file, the header is set at the beginning.
    m_pSyntax->InitParser(buffer_reader, 0);
    return true;
  }

 private:
  // Add test cases here as private friend so that protected members in
  // CPDF_Parser can be accessed by test cases.
  // Need to access RebuildCrossRef.
  FRIEND_TEST(cpdf_parser, RebuildCrossRefCorrectly);
  FRIEND_TEST(cpdf_parser, RebuildCrossRefFailed);
  // Need to access LoadCrossRefV4.
  FRIEND_TEST(cpdf_parser, LoadCrossRefV4);
};

TEST(cpdf_parser, RebuildCrossRefCorrectly) {
  CPDF_TestParser parser;
  std::string test_file;
  ASSERT_TRUE(PathService::GetTestFilePath("parser_rebuildxref_correct.pdf",
                                           &test_file));
  ASSERT_TRUE(parser.InitTestFromFile(test_file.c_str())) << test_file;

  ASSERT_TRUE(parser.RebuildCrossRef());
  const FX_FILESIZE offsets[] = {0, 15, 61, 154, 296, 374, 450};
  const uint16_t versions[] = {0, 0, 2, 4, 6, 8, 0};
  for (size_t i = 0; i < FX_ArraySize(offsets); ++i)
    EXPECT_EQ(offsets[i], parser.m_ObjectInfo[i].pos);
  for (size_t i = 0; i < FX_ArraySize(versions); ++i)
    EXPECT_EQ(versions[i], parser.m_ObjectInfo[i].gennum);
}

TEST(cpdf_parser, RebuildCrossRefFailed) {
  CPDF_TestParser parser;
  std::string test_file;
  ASSERT_TRUE(PathService::GetTestFilePath(
      "parser_rebuildxref_error_notrailer.pdf", &test_file));
  ASSERT_TRUE(parser.InitTestFromFile(test_file.c_str())) << test_file;

  ASSERT_FALSE(parser.RebuildCrossRef());
}

TEST(cpdf_parser, LoadCrossRefV4) {
  {
    const unsigned char xref_table[] =
        "xref \n"
        "0 6 \n"
        "0000000003 65535 f \n"
        "0000000017 00000 n \n"
        "0000000081 00000 n \n"
        "0000000000 00007 f \n"
        "0000000331 00000 n \n"
        "0000000409 00000 n \n"
        "trail";  // Needed to end cross ref table reading.
    CPDF_TestParser parser;
    ASSERT_TRUE(
        parser.InitTestFromBuffer(xref_table, FX_ArraySize(xref_table)));

    ASSERT_TRUE(parser.LoadCrossRefV4(0, 0, false));
    const FX_FILESIZE offsets[] = {0, 17, 81, 0, 331, 409};
    const uint8_t types[] = {0, 1, 1, 0, 1, 1};
    for (size_t i = 0; i < FX_ArraySize(offsets); ++i) {
      EXPECT_EQ(offsets[i], parser.m_ObjectInfo[i].pos);
      EXPECT_EQ(types[i], parser.m_ObjectInfo[i].type);
    }
  }
  {
    const unsigned char xref_table[] =
        "xref \n"
        "0 1 \n"
        "0000000000 65535 f \n"
        "3 1 \n"
        "0000025325 00000 n \n"
        "8 2 \n"
        "0000025518 00002 n \n"
        "0000025635 00000 n \n"
        "12 1 \n"
        "0000025777 00000 n \n"
        "trail";  // Needed to end cross ref table reading.
    CPDF_TestParser parser;
    ASSERT_TRUE(
        parser.InitTestFromBuffer(xref_table, FX_ArraySize(xref_table)));

    ASSERT_TRUE(parser.LoadCrossRefV4(0, 0, false));
    const FX_FILESIZE offsets[] = {0, 0,     0,     25325, 0, 0,    0,
                                   0, 25518, 25635, 0,     0, 25777};
    const uint8_t types[] = {0, 0, 0, 1, 0, 0, 0, 0, 1, 1, 0, 0, 1};
    for (size_t i = 0; i < FX_ArraySize(offsets); ++i) {
      EXPECT_EQ(offsets[i], parser.m_ObjectInfo[i].pos);
      EXPECT_EQ(types[i], parser.m_ObjectInfo[i].type);
    }
  }
  {
    const unsigned char xref_table[] =
        "xref \n"
        "0 1 \n"
        "0000000000 65535 f \n"
        "3 1 \n"
        "0000025325 00000 n \n"
        "8 2 \n"
        "0000000000 65535 f \n"
        "0000025635 00000 n \n"
        "12 1 \n"
        "0000025777 00000 n \n"
        "trail";  // Needed to end cross ref table reading.
    CPDF_TestParser parser;
    ASSERT_TRUE(
        parser.InitTestFromBuffer(xref_table, FX_ArraySize(xref_table)));

    ASSERT_TRUE(parser.LoadCrossRefV4(0, 0, false));
    const FX_FILESIZE offsets[] = {0, 0, 0,     25325, 0, 0,    0,
                                   0, 0, 25635, 0,     0, 25777};
    const uint8_t types[] = {0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1};
    for (size_t i = 0; i < FX_ArraySize(offsets); ++i) {
      EXPECT_EQ(offsets[i], parser.m_ObjectInfo[i].pos);
      EXPECT_EQ(types[i], parser.m_ObjectInfo[i].type);
    }
  }
  {
    const unsigned char xref_table[] =
        "xref \n"
        "0 7 \n"
        "0000000002 65535 f \n"
        "0000000023 00000 n \n"
        "0000000003 65535 f \n"
        "0000000004 65535 f \n"
        "0000000000 65535 f \n"
        "0000000045 00000 n \n"
        "0000000179 00000 n \n"
        "trail";  // Needed to end cross ref table reading.
    CPDF_TestParser parser;
    ASSERT_TRUE(
        parser.InitTestFromBuffer(xref_table, FX_ArraySize(xref_table)));

    ASSERT_TRUE(parser.LoadCrossRefV4(0, 0, false));
    const FX_FILESIZE offsets[] = {0, 23, 0, 0, 0, 45, 179};
    const uint8_t types[] = {0, 1, 0, 0, 0, 1, 1};
    for (size_t i = 0; i < FX_ArraySize(offsets); ++i) {
      EXPECT_EQ(offsets[i], parser.m_ObjectInfo[i].pos);
      EXPECT_EQ(types[i], parser.m_ObjectInfo[i].type);
    }
  }
}