1 // Copyright 2015 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 <cstring>
6 #include <string>
7 
8 #include "core/include/fpdfapi/fpdf_parser.h"
9 #include "core/include/fxcrt/fx_basic.h"
10 #include "testing/embedder_test.h"
11 #include "testing/fx_string_testhelpers.h"
12 #include "testing/gtest/include/gtest/gtest.h"
13 
14 class FPDFParserDecodeEmbeddertest : public EmbedderTest {};
15 
16 // NOTE: python's zlib.compress() and zlib.decompress() may be useful for
17 // external validation of the FlateEncode/FlateDecode test cases.
18 
19 #define TEST_CASE(input_literal, expected_literal)                           \
20   {                                                                          \
21     (const unsigned char*) input_literal, sizeof(input_literal) - 1,         \
22         (const unsigned char*)expected_literal, sizeof(expected_literal) - 1 \
23   }
24 
TEST_F(FPDFParserDecodeEmbeddertest,FlateEncode)25 TEST_F(FPDFParserDecodeEmbeddertest, FlateEncode) {
26   struct FlateEncodeCase {
27     const unsigned char* input;
28     unsigned int input_size;
29     const unsigned char* expected;
30     unsigned int expected_size;
31   } flate_encode_cases[] = {
32       TEST_CASE("", "\x78\x9c\x03\x00\x00\x00\x00\x01"),
33       TEST_CASE(" ", "\x78\x9c\x53\x00\x00\x00\x21\x00\x21"),
34       TEST_CASE("123", "\x78\x9c\x33\x34\x32\x06\x00\01\x2d\x00\x97"),
35       TEST_CASE("\x00\xff", "\x78\x9c\x63\xf8\x0f\x00\x01\x01\x01\x00"),
36       TEST_CASE(
37           "1 0 0 -1 29 763 cm\n0 0 555 735 re\nW n\nq\n0 0 555 734.394 re\n"
38           "W n\nq\n0.8009 0 0 0.8009 0 0 cm\n1 1 1 RG 1 1 1 rg\n/G0 gs\n"
39           "0 0 693 917 re\nf\nQ\nQ\n",
40           "\x78\x9c\x33\x54\x30\x00\x42\x5d\x43\x05\x23\x4b\x05\x73\x33\x63"
41           "\x85\xe4\x5c\x2e\x90\x80\xa9\xa9\xa9\x82\xb9\xb1\xa9\x42\x51\x2a"
42           "\x57\xb8\x42\x1e\x57\x21\x92\xa0\x89\x9e\xb1\xa5\x09\x92\x84\x9e"
43           "\x85\x81\x81\x25\xd8\x14\x24\x26\xd0\x18\x43\x05\x10\x0c\x72\x57"
44           "\x80\x30\x8a\xd2\xb9\xf4\xdd\x0d\x14\xd2\x8b\xc1\x46\x99\x59\x1a"
45           "\x2b\x58\x1a\x9a\x83\x8c\x49\xe3\x0a\x04\x42\x00\x37\x4c\x1b\x42"),
46   };
47 
48   for (size_t i = 0; i < FX_ArraySize(flate_encode_cases); ++i) {
49     FlateEncodeCase* ptr = &flate_encode_cases[i];
50     unsigned char* result;
51     unsigned int result_size;
52     FlateEncode(ptr->input, ptr->input_size, result, result_size);
53     ASSERT_TRUE(result);
54     EXPECT_EQ(std::string((const char*)ptr->expected, ptr->expected_size),
55               std::string((const char*)result, result_size))
56         << " for case " << i;
57     FX_Free(result);
58   }
59 }
60 
TEST_F(FPDFParserDecodeEmbeddertest,FlateDecode)61 TEST_F(FPDFParserDecodeEmbeddertest, FlateDecode) {
62   struct FlateDecodeCase {
63     const unsigned char* input;
64     unsigned int input_size;
65     const unsigned char* expected;
66     unsigned int expected_size;
67   } flate_decode_cases[] = {
68       TEST_CASE("", ""), TEST_CASE("preposterous nonsense", ""),
69       TEST_CASE("\x78\x9c\x03\x00\x00\x00\x00\x01", ""),
70       TEST_CASE("\x78\x9c\x53\x00\x00\x00\x21\x00\x21", " "),
71       TEST_CASE("\x78\x9c\x33\x34\x32\x06\x00\01\x2d\x00\x97", "123"),
72       TEST_CASE("\x78\x9c\x63\xf8\x0f\x00\x01\x01\x01\x00", "\x00\xff"),
73       TEST_CASE(
74           "\x78\x9c\x33\x54\x30\x00\x42\x5d\x43\x05\x23\x4b\x05\x73\x33\x63"
75           "\x85\xe4\x5c\x2e\x90\x80\xa9\xa9\xa9\x82\xb9\xb1\xa9\x42\x51\x2a"
76           "\x57\xb8\x42\x1e\x57\x21\x92\xa0\x89\x9e\xb1\xa5\x09\x92\x84\x9e"
77           "\x85\x81\x81\x25\xd8\x14\x24\x26\xd0\x18\x43\x05\x10\x0c\x72\x57"
78           "\x80\x30\x8a\xd2\xb9\xf4\xdd\x0d\x14\xd2\x8b\xc1\x46\x99\x59\x1a"
79           "\x2b\x58\x1a\x9a\x83\x8c\x49\xe3\x0a\x04\x42\x00\x37\x4c\x1b\x42",
80           "1 0 0 -1 29 763 cm\n0 0 555 735 re\nW n\nq\n0 0 555 734.394 re\n"
81           "W n\nq\n0.8009 0 0 0.8009 0 0 cm\n1 1 1 RG 1 1 1 rg\n/G0 gs\n"
82           "0 0 693 917 re\nf\nQ\nQ\n"),
83   };
84 
85   for (size_t i = 0; i < FX_ArraySize(flate_decode_cases); ++i) {
86     FlateDecodeCase* ptr = &flate_decode_cases[i];
87     unsigned char* result;
88     unsigned int result_size;
89     FlateDecode(ptr->input, ptr->input_size, result, result_size);
90     ASSERT_TRUE(result);
91     EXPECT_EQ(std::string((const char*)ptr->expected, ptr->expected_size),
92               std::string((const char*)result, result_size))
93         << " for case " << i;
94     FX_Free(result);
95   }
96 }
97 
TEST_F(FPDFParserDecodeEmbeddertest,Bug_552046)98 TEST_F(FPDFParserDecodeEmbeddertest, Bug_552046) {
99   // Tests specifying multiple image filters for a stream. Should not cause a
100   // crash when rendered.
101   EXPECT_TRUE(OpenDocument("bug_552046.pdf"));
102   FPDF_PAGE page = LoadPage(0);
103   FPDF_BITMAP bitmap = RenderPage(page);
104   FPDFBitmap_Destroy(bitmap);
105   UnloadPage(page);
106 }
107 
TEST_F(FPDFParserDecodeEmbeddertest,Bug_555784)108 TEST_F(FPDFParserDecodeEmbeddertest, Bug_555784) {
109   // Tests bad input to the run length decoder that caused a heap overflow.
110   // Should not cause a crash when rendered.
111   EXPECT_TRUE(OpenDocument("bug_555784.pdf"));
112   FPDF_PAGE page = LoadPage(0);
113   FPDF_BITMAP bitmap = RenderPage(page);
114   FPDFBitmap_Destroy(bitmap);
115   UnloadPage(page);
116 }
117 
118 #undef TEST_CASE
119