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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/fxcodec/jbig2/JBig2_BitStream.h"
#include <memory>
#include <utility>
#include "core/fpdfapi/parser/cpdf_stream_acc.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/base/ptr_util.h"
TEST(JBig2_BitStream, ReadNBits) {
std::unique_ptr<uint8_t, FxFreeDeleter> data(FX_Alloc(uint8_t, 1));
data.get()[0] = 0xb1; // 10110001
auto in_stream = pdfium::MakeUnique<CPDF_Stream>(std::move(data), 1, nullptr);
auto acc = pdfium::MakeRetain<CPDF_StreamAcc>(in_stream.get());
acc->LoadAllData();
CJBig2_BitStream stream(acc);
uint32_t val1;
EXPECT_EQ(0, stream.readNBits(1, &val1));
EXPECT_EQ(1U, val1);
int32_t val2;
EXPECT_EQ(0, stream.readNBits(1, &val2));
EXPECT_EQ(0, val2);
EXPECT_EQ(0, stream.readNBits(2, &val2));
EXPECT_EQ(3, val2);
EXPECT_EQ(0, stream.readNBits(4, &val2));
EXPECT_EQ(1, val2);
}
TEST(JBig2_BitStream, ReadNBitsLargerThenData) {
std::unique_ptr<uint8_t, FxFreeDeleter> data(FX_Alloc(uint8_t, 1));
data.get()[0] = 0xb1;
auto in_stream = pdfium::MakeUnique<CPDF_Stream>(std::move(data), 1, nullptr);
auto acc = pdfium::MakeRetain<CPDF_StreamAcc>(in_stream.get());
acc->LoadAllData();
CJBig2_BitStream stream(acc);
uint32_t val1;
EXPECT_EQ(0, stream.readNBits(10, &val1));
EXPECT_EQ(0xb1U, val1);
}
TEST(JBig2_BitStream, ReadNBitsNullStream) {
auto in_stream = pdfium::MakeUnique<CPDF_Stream>(nullptr, 0, nullptr);
auto acc = pdfium::MakeRetain<CPDF_StreamAcc>(in_stream.get());
acc->LoadAllData();
CJBig2_BitStream stream(acc);
uint32_t val1;
EXPECT_EQ(-1, stream.readNBits(1, &val1));
int32_t val2;
EXPECT_EQ(-1, stream.readNBits(2, &val2));
}
TEST(JBig2_BitStream, ReadNBitsEmptyStream) {
std::unique_ptr<uint8_t, FxFreeDeleter> data(FX_Alloc(uint8_t, 1));
auto in_stream = pdfium::MakeUnique<CPDF_Stream>(std::move(data), 0, nullptr);
auto acc = pdfium::MakeRetain<CPDF_StreamAcc>(in_stream.get());
acc->LoadAllData();
CJBig2_BitStream stream(acc);
uint32_t val1;
EXPECT_EQ(-1, stream.readNBits(1, &val1));
int32_t val2;
EXPECT_EQ(-1, stream.readNBits(2, &val2));
}
TEST(JBig2_BitStream, ReadNBitsOutOfBounds) {
std::unique_ptr<uint8_t, FxFreeDeleter> data(FX_Alloc(uint8_t, 1));
data.get()[0] = 0xb1; // 10110001
auto in_stream = pdfium::MakeUnique<CPDF_Stream>(std::move(data), 1, nullptr);
auto acc = pdfium::MakeRetain<CPDF_StreamAcc>(in_stream.get());
acc->LoadAllData();
CJBig2_BitStream stream(acc);
uint32_t val1;
EXPECT_EQ(0, stream.readNBits(8, &val1));
int32_t val2;
EXPECT_EQ(-1, stream.readNBits(2, &val2));
}
TEST(JBig2_BitStream, ReadNBitsWhereNIs36) {
std::unique_ptr<uint8_t, FxFreeDeleter> data(FX_Alloc(uint8_t, 5));
data.get()[0] = 0xb0;
data.get()[1] = 0x01;
data.get()[2] = 0x00;
data.get()[3] = 0x00;
data.get()[4] = 0x40;
auto in_stream = pdfium::MakeUnique<CPDF_Stream>(std::move(data), 5, nullptr);
auto acc = pdfium::MakeRetain<CPDF_StreamAcc>(in_stream.get());
acc->LoadAllData();
CJBig2_BitStream stream(acc);
// This will shift off the top two bits and they end up lost.
uint32_t val1;
EXPECT_EQ(0, stream.readNBits(34, &val1));
EXPECT_EQ(0xc0040001U, val1);
}
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