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// 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/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:
CFX_TestBufferRead(const unsigned char* buffer_in, size_t buf_size)
: buffer_(buffer_in), total_size_(buf_size) {}
// IFX_Stream
void Release() override { delete this; }
// 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:
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) {
IFX_SeekableReadStream* pFileAccess = FX_CreateFileRead(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_TestBufferRead* buffer_reader = new CFX_TestBufferRead(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);
}
}
}
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