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// Copyright 2017 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 "core/fpdfapi/parser/cpdf_cross_ref_avail.h"
#include <memory>
#include <string>
#include "core/fpdfapi/parser/cpdf_syntax_parser.h"
#include "testing/fx_string_testhelpers.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/base/ptr_util.h"
namespace {
std::unique_ptr<CPDF_SyntaxParser> MakeParserForBuffer(
const unsigned char* buffer,
size_t buffer_size) {
auto parser = pdfium::MakeUnique<CPDF_SyntaxParser>();
parser->InitParser(
pdfium::MakeRetain<CFX_BufferSeekableReadStream>(buffer, buffer_size), 0);
return parser;
}
} // namespace
TEST(CPDF_CrossRefAvailTest, CheckCrossRefV4) {
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"
"trailer\n"
"<</Root 14 0 R/ID "
"[<afbb0f593c2d2aea5b519cb61da1c17b><4f9bb2e7978401808f8f1f2a75c322c8>]"
"/Info 15 0 R/Size 16>>";
const FX_FILESIZE last_crossref_offset = 0;
auto parser = MakeParserForBuffer(xref_table, FX_ArraySize(xref_table));
auto cross_ref_avail = pdfium::MakeUnique<CPDF_CrossRefAvail>(
parser.get(), last_crossref_offset);
EXPECT_EQ(CPDF_DataAvail::DataAvailable, cross_ref_avail->CheckAvail());
}
TEST(CPDF_CrossRefAvailTest, CheckCrossRefStream) {
const unsigned char xref_stream[] =
"16 0 obj\n"
"<</Filter /FlateDecode>>"
" stream \n"
"STREAM DATA STREAM DATA STREAM DATA\n"
"endstream\n"
"endobj\n";
const FX_FILESIZE last_crossref_offset = 0;
auto parser = MakeParserForBuffer(xref_stream, FX_ArraySize(xref_stream));
auto cross_ref_avail = pdfium::MakeUnique<CPDF_CrossRefAvail>(
parser.get(), last_crossref_offset);
EXPECT_EQ(CPDF_DataAvail::DataAvailable, cross_ref_avail->CheckAvail());
}
TEST(CPDF_CrossRefAvailTest, IncorrectStartOffset) {
const unsigned char xref_stream[] =
"16 0 obj\n"
"<</Filter /FlateDecode>>"
" stream \n"
"STREAM DATA STREAM DATA STREAM DATA\n"
"endstream\n"
"endobj\n";
const FX_FILESIZE last_crossref_offset = 70000;
auto parser = MakeParserForBuffer(xref_stream, FX_ArraySize(xref_stream));
auto cross_ref_avail = pdfium::MakeUnique<CPDF_CrossRefAvail>(
parser.get(), last_crossref_offset);
EXPECT_EQ(CPDF_DataAvail::DataError, cross_ref_avail->CheckAvail());
}
TEST(CPDF_CrossRefAvailTest, IncorrectPrevOffset) {
const unsigned char xref_stream[] =
"16 0 obj\n"
"<</Type /XRef /Prev 70000>>"
" stream \n"
"STREAM DATA STREAM DATA STREAM DATA\n"
"endstream\n"
"endobj\n";
const FX_FILESIZE last_crossref_offset = 0;
auto parser = MakeParserForBuffer(xref_stream, FX_ArraySize(xref_stream));
auto cross_ref_avail = pdfium::MakeUnique<CPDF_CrossRefAvail>(
parser.get(), last_crossref_offset);
EXPECT_EQ(CPDF_DataAvail::DataError, cross_ref_avail->CheckAvail());
}
TEST(CPDF_CrossRefAvailTest, IncorrectPrevStreamOffset) {
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"
"trailer\n"
"<</Root 14 0 R/ID "
"[<afbb0f593c2d2aea5b519cb61da1c17b><4f9bb2e7978401808f8f1f2a75c322c8>]"
"/Info 15 0 R/Size 16 /XRefStm 70000>>";
const FX_FILESIZE last_crossref_offset = 0;
auto parser = MakeParserForBuffer(xref_table, FX_ArraySize(xref_table));
auto cross_ref_avail = pdfium::MakeUnique<CPDF_CrossRefAvail>(
parser.get(), last_crossref_offset);
EXPECT_EQ(CPDF_DataAvail::DataError, cross_ref_avail->CheckAvail());
}
TEST(CPDF_CrossRefAvailTest, IncorrectData) {
const unsigned char incorrect_data[] =
"fiajaoilf w9ifaoihwoiafhja wfijaofijoiaw fhj oiawhfoiah "
"wfoihoiwfghouiafghwoigahfi";
const FX_FILESIZE last_crossref_offset = 0;
auto parser =
MakeParserForBuffer(incorrect_data, FX_ArraySize(incorrect_data));
auto cross_ref_avail = pdfium::MakeUnique<CPDF_CrossRefAvail>(
parser.get(), last_crossref_offset);
EXPECT_EQ(CPDF_DataAvail::DataError, cross_ref_avail->CheckAvail());
}
TEST(CPDF_CrossRefAvailTest, ThreeCrossRefV4) {
char int_buffer[100];
int prev_offset = 0;
int cur_offset = 0;
std::string table = "pdf blah blah blah\n";
prev_offset = cur_offset;
cur_offset = static_cast<int>(table.size());
table +=
"xref \n"
"0 6 \n"
"0000000003 65535 f \n"
"trailer\n"
"<</Root 14 0 R/ID "
"[<afbb0f593c2d2aea5b519cb61da1c17b><4f9bb2e7978401808f8f1f2a75c322c8>]"
"/Info 15 0 R/Size 16>>\n";
table += "Dummy Data jgwhughouiwbahng";
prev_offset = cur_offset;
cur_offset = static_cast<int>(table.size());
table += std::string(
"xref \n"
"0 6 \n"
"0000000003 65535 f \n"
"trailer\n"
"<</Root 14 0 R/ID "
"[<afbb0f593c2d2aea5b519cb61da1c17b><"
"4f9bb2e7978401808f8f1f2a75c322c8>]"
"/Info 15 0 R/Size 16"
"/Prev ") +
FXSYS_itoa(prev_offset, int_buffer, 10) + ">>\n";
table += "More Dummy Data jgwhughouiwbahng";
prev_offset = cur_offset;
cur_offset = static_cast<int>(table.size());
table += std::string(
"xref \n"
"0 6 \n"
"0000000003 65535 f \n"
"trailer\n"
"<</Root 14 0 R/ID "
"[<afbb0f593c2d2aea5b519cb61da1c17b><"
"4f9bb2e7978401808f8f1f2a75c322c8>]"
"/Info 15 0 R/Size 16"
"/Prev ") +
FXSYS_itoa(prev_offset, int_buffer, 10) + ">>\n";
const FX_FILESIZE last_crossref_offset = cur_offset;
auto parser = MakeParserForBuffer(
reinterpret_cast<const unsigned char*>(table.data()), table.size());
auto cross_ref_avail = pdfium::MakeUnique<CPDF_CrossRefAvail>(
parser.get(), last_crossref_offset);
EXPECT_EQ(CPDF_DataAvail::DataAvailable, cross_ref_avail->CheckAvail());
}
TEST(CPDF_CrossRefAvailTest, ThreeCrossRefV5) {
char int_buffer[100];
int prev_offset = 0;
int cur_offset = 0;
std::string table = "pdf blah blah blah\n";
prev_offset = cur_offset;
cur_offset = static_cast<int>(table.size());
table +=
"16 0 obj\n"
"<</Type /XRef>>"
" stream \n"
"STREAM DATA STREAM DATA STREAM DATA ahfcuabfkuabfu\n"
"endstream\n"
"endobj\n";
table += "Dummy Data jgwhughouiwbahng";
prev_offset = cur_offset;
cur_offset = static_cast<int>(table.size());
table += std::string(
"55 0 obj\n"
"<</Type /XRef /Prev ") +
FXSYS_itoa(prev_offset, int_buffer, 10) +
">>"
" stream \n"
"STREAM DATA STREAM DATA STREAM DATA\n"
"endstream\n"
"endobj\n";
table += "More Dummy Data jgwhughouiwbahng";
prev_offset = cur_offset;
cur_offset = static_cast<int>(table.size());
table += std::string(
"88 0 obj\n"
"<</Type /XRef /NNNN /Prev ") +
FXSYS_itoa(prev_offset, int_buffer, 10) +
">>"
" stream \n"
"STREAM DATA STREAM DATA STREAM DATA favav\n"
"endstream\n"
"endobj\n";
const FX_FILESIZE last_crossref_offset = cur_offset;
auto parser = MakeParserForBuffer(
reinterpret_cast<const unsigned char*>(table.data()), table.size());
auto cross_ref_avail = pdfium::MakeUnique<CPDF_CrossRefAvail>(
parser.get(), last_crossref_offset);
EXPECT_EQ(CPDF_DataAvail::DataAvailable, cross_ref_avail->CheckAvail());
}
TEST(CPDF_CrossRefAvailTest, Mixed) {
char int_buffer[100];
std::string table = "pdf blah blah blah\n";
const int first_v5_table_offset = static_cast<int>(table.size());
table +=
"16 0 obj\n"
"<</Type /XRef>>"
" stream \n"
"STREAM DATA STREAM DATA STREAM DATA ahfcuabfkuabfu\n"
"endstream\n"
"endobj\n";
table += "Dummy Data jgwhughouiwbahng";
const int second_v4_table_offset = static_cast<int>(table.size());
table += std::string(
"xref \n"
"0 6 \n"
"0000000003 65535 f \n"
"trailer\n"
"<</Root 14 0 R/ID "
"[<afbb0f593c2d2aea5b519cb61da1c17b><"
"4f9bb2e7978401808f8f1f2a75c322c8>]"
"/Info 15 0 R/Size 16"
"/Prev ") +
FXSYS_itoa(first_v5_table_offset, int_buffer, 10) + ">>\n";
table += "More Dummy Data jgwhughouiwbahng";
const int last_v4_table_offset = static_cast<int>(table.size());
table += std::string(
"xref \n"
"0 6 \n"
"0000000003 65535 f \n"
"trailer\n"
"<</Root 14 0 R/ID "
"[<afbb0f593c2d2aea5b519cb61da1c17b><"
"4f9bb2e7978401808f8f1f2a75c322c8>]"
"/Info 15 0 R/Size 16"
"/Prev ") +
FXSYS_itoa(second_v4_table_offset, int_buffer, 10) + " /XRefStm " +
FXSYS_itoa(first_v5_table_offset, int_buffer, 10) + ">>\n";
const FX_FILESIZE last_crossref_offset = last_v4_table_offset;
auto parser = MakeParserForBuffer(
reinterpret_cast<const unsigned char*>(table.data()), table.size());
auto cross_ref_avail = pdfium::MakeUnique<CPDF_CrossRefAvail>(
parser.get(), last_crossref_offset);
EXPECT_EQ(CPDF_DataAvail::DataAvailable, cross_ref_avail->CheckAvail());
}
TEST(CPDF_CrossRefAvailTest, CrossRefV5IsNotStream) {
const unsigned char invalid_xref_stream[] =
"16 0 obj\n"
"[/array /object]\n"
"endstream\n"
"endobj\n";
const FX_FILESIZE last_crossref_offset = 0;
auto parser = MakeParserForBuffer(invalid_xref_stream,
FX_ArraySize(invalid_xref_stream));
auto cross_ref_avail = pdfium::MakeUnique<CPDF_CrossRefAvail>(
parser.get(), last_crossref_offset);
EXPECT_EQ(CPDF_DataAvail::DataError, cross_ref_avail->CheckAvail());
}
TEST(CPDF_CrossRefAvailTest, CrossRefV4WithEncryptRef) {
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"
"trailer\n"
"<</Root 14 0 R/ID "
"[<afbb0f593c2d2aea5b519cb61da1c17b><4f9bb2e7978401808f8f1f2a75c322c8>]"
"/Encrypt 77 0 R"
"/Info 15 0 R/Size 16>>";
const FX_FILESIZE last_crossref_offset = 0;
auto parser = MakeParserForBuffer(xref_table, FX_ArraySize(xref_table));
auto cross_ref_avail = pdfium::MakeUnique<CPDF_CrossRefAvail>(
parser.get(), last_crossref_offset);
EXPECT_EQ(CPDF_DataAvail::DataError, cross_ref_avail->CheckAvail());
}
TEST(CPDF_CrossRefAvailTest, CrossRefStreamWithEncryptRef) {
const unsigned char xref_stream[] =
"16 0 obj\n"
"<</Filter /FlateDecode /Encrypt 77 0 R>>"
" stream \n"
"STREAM DATA STREAM DATA STREAM DATA\n"
"endstream\n"
"endobj\n";
const FX_FILESIZE last_crossref_offset = 0;
auto parser = MakeParserForBuffer(xref_stream, FX_ArraySize(xref_stream));
auto cross_ref_avail = pdfium::MakeUnique<CPDF_CrossRefAvail>(
parser.get(), last_crossref_offset);
EXPECT_EQ(CPDF_DataAvail::DataError, cross_ref_avail->CheckAvail());
}
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