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// Copyright 2015 The Chromium OS 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 "bsdiff/extents_file.h"
#include <gmock/gmock.h>
#include <gtest/gtest.h>
#include <string>
#include <vector>
#include "bsdiff/file_interface.h"
using std::vector;
using testing::AnyNumber;
using testing::InSequence;
using testing::Return;
using testing::StrictMock;
using testing::_;
namespace bsdiff {
// Mock class for the underlying file interface.
class MockFile : public FileInterface {
public:
MOCK_METHOD3(Read, bool(void*, size_t, size_t*));
MOCK_METHOD3(Write, bool(const void*, size_t, size_t*));
MOCK_METHOD1(Seek, bool(off_t));
MOCK_METHOD0(Close, bool());
MOCK_METHOD1(GetSize, bool(uint64_t*));
};
ACTION(SucceedIO) {
// Check that arg1 (count) can be converted
*arg2 = arg1;
return true;
}
ACTION_P(SucceedPartialIO, bytes) {
// Check that arg1 (count) can be converted
*arg2 = bytes;
return true;
}
class ExtentsFileTest : public testing::Test {
protected:
void SetUp() {
mock_file_ = new StrictMock<MockFile>();
mock_file_ptr_.reset(mock_file_);
// The destructor of the ExtentsFile will call Close once.
EXPECT_CALL(*mock_file_, Close()).WillOnce(Return(true));
}
// Pointer to the underlying File owned by the ExtentsFile under test. This
// pointer is invalidated whenever the ExtentsFile is destroyed.
StrictMock<MockFile>* mock_file_;
std::unique_ptr<FileInterface> mock_file_ptr_;
};
TEST_F(ExtentsFileTest, DestructorCloses) {
ExtentsFile file(std::move(mock_file_ptr_), {});
}
TEST_F(ExtentsFileTest, CloseIsForwarded) {
ExtentsFile file(std::move(mock_file_ptr_), {});
EXPECT_TRUE(file.Close());
EXPECT_CALL(*mock_file_, Close()).WillOnce(Return(false));
}
TEST_F(ExtentsFileTest, GetSizeSumExtents) {
ExtentsFile file(std::move(mock_file_ptr_),
{ex_t{10, 5}, ex_t{20, 5}, {25, 2}});
uint64_t size;
EXPECT_TRUE(file.GetSize(&size));
EXPECT_EQ(12U, size);
}
TEST_F(ExtentsFileTest, SeekToRightOffsets) {
ExtentsFile file(std::move(mock_file_ptr_),
{ex_t{10, 5}, ex_t{20, 5}, {25, 2}});
vector<std::pair<off_t, off_t>> tests = {
// Seek to the beginning of the file.
{0, 10},
// Seek to the middle of a extent.
{3, 13},
{11, 26},
// Seek to the extent boundary.
{5, 20}, // Seeks to the first byte in the second extent.
{10, 25},
};
for (const auto& offset_pair : tests) {
// We use a failing Read() call to trigger the actual seek call to the
// underlying file.
EXPECT_CALL(*mock_file_, Seek(offset_pair.second)).WillOnce(Return(true));
EXPECT_CALL(*mock_file_, Read(_, _, _)).WillOnce(Return(false));
EXPECT_TRUE(file.Seek(offset_pair.first));
size_t bytes_read;
EXPECT_FALSE(file.Read(nullptr, 1, &bytes_read));
}
// Seeking to the end of the file is ok, but not past it.
EXPECT_TRUE(file.Seek(12));
EXPECT_FALSE(file.Seek(13));
EXPECT_FALSE(file.Seek(-1));
}
TEST_F(ExtentsFileTest, ReadAcrossAllExtents) {
ExtentsFile file(std::move(mock_file_ptr_),
{ex_t{10, 5}, ex_t{20, 7}, {27, 3}});
InSequence s;
char* buf = reinterpret_cast<char*>(0x1234);
EXPECT_CALL(*mock_file_, Seek(10)).WillOnce(Return(true));
EXPECT_CALL(*mock_file_, Read(buf, 5, _)).WillOnce(SucceedIO());
EXPECT_CALL(*mock_file_, Seek(20)).WillOnce(Return(true));
EXPECT_CALL(*mock_file_, Read(buf + 5, 7, _)).WillOnce(SucceedIO());
EXPECT_CALL(*mock_file_, Seek(27)).WillOnce(Return(true));
EXPECT_CALL(*mock_file_, Read(buf + 12, 3, _)).WillOnce(SucceedIO());
// FileExtents::Read() should read everything in one shot, by reading all
// the little chunks. Note that it doesn't attempt to read past the end of the
// FileExtents.
size_t bytes_read = 0;
EXPECT_TRUE(file.Read(buf, 100, &bytes_read));
EXPECT_EQ(15U, bytes_read);
}
TEST_F(ExtentsFileTest, MultiReadAcrossAllExtents) {
ExtentsFile file(std::move(mock_file_ptr_),
{ex_t{10, 5}, ex_t{20, 7}, {27, 3}});
InSequence s;
char* buf = reinterpret_cast<char*>(0x1234);
EXPECT_CALL(*mock_file_, Seek(10)).WillOnce(Return(true));
EXPECT_CALL(*mock_file_, Read(buf, 2, _)).WillOnce(SucceedIO());
EXPECT_CALL(*mock_file_, Seek(12)).WillOnce(Return(true));
EXPECT_CALL(*mock_file_, Read(buf, 3, _)).WillOnce(SucceedIO());
EXPECT_CALL(*mock_file_, Seek(20)).WillOnce(Return(true));
EXPECT_CALL(*mock_file_, Read(buf + 3, 5, _)).WillOnce(SucceedIO());
EXPECT_CALL(*mock_file_, Seek(25)).WillOnce(Return(true));
EXPECT_CALL(*mock_file_, Read(buf, 2, _)).WillOnce(SucceedIO());
EXPECT_CALL(*mock_file_, Seek(27)).WillOnce(Return(true));
EXPECT_CALL(*mock_file_, Read(buf + 2, 3, _)).WillOnce(SucceedIO());
size_t bytes_read = 0;
EXPECT_TRUE(file.Read(buf, 2, &bytes_read));
EXPECT_EQ(2U, bytes_read);
EXPECT_TRUE(file.Read(buf, 8, &bytes_read));
EXPECT_EQ(8U, bytes_read);
EXPECT_TRUE(file.Read(buf, 100, &bytes_read));
EXPECT_EQ(5U, bytes_read);
}
TEST_F(ExtentsFileTest, ReadSmallChunks) {
ExtentsFile file(std::move(mock_file_ptr_), {ex_t{10, 1}, ex_t{20, 10}});
InSequence s;
char* buf = reinterpret_cast<char*>(0x1234);
EXPECT_CALL(*mock_file_, Seek(10)).WillOnce(Return(true));
EXPECT_CALL(*mock_file_, Read(buf, 1, _)).WillOnce(SucceedIO());
EXPECT_CALL(*mock_file_, Seek(20)).WillOnce(Return(true));
// We expect to read only part of the second extent.
EXPECT_CALL(*mock_file_, Read(buf + 1, 1, _)).WillOnce(SucceedIO());
size_t bytes_read = 0;
EXPECT_TRUE(file.Read(buf, 2, &bytes_read));
EXPECT_EQ(2U, bytes_read);
}
TEST_F(ExtentsFileTest, ReadFailureFails) {
ExtentsFile file(std::move(mock_file_ptr_), {ex_t{10, 1}, ex_t{20, 10}});
EXPECT_CALL(*mock_file_, Seek(_))
.Times(AnyNumber())
.WillRepeatedly(Return(true));
EXPECT_CALL(*mock_file_, Read(_, 1, _)).WillOnce(SucceedIO());
// A second read that fails will succeed if there was partial data read.
EXPECT_CALL(*mock_file_, Read(_, 10, _)).WillOnce(Return(false));
char* buf = reinterpret_cast<char*>(0x1234);
size_t bytes_read = 0;
EXPECT_TRUE(file.Read(buf, 100, &bytes_read));
EXPECT_EQ(1U, bytes_read);
}
TEST_F(ExtentsFileTest, ReadFails) {
ExtentsFile file(std::move(mock_file_ptr_), {ex_t{10, 1}, ex_t{20, 10}});
EXPECT_CALL(*mock_file_, Seek(10)).WillOnce(Return(true));
EXPECT_CALL(*mock_file_, Read(_, 1, _)).WillOnce(Return(false));
size_t bytes_read;
EXPECT_FALSE(file.Read(nullptr, 1, &bytes_read));
}
TEST_F(ExtentsFileTest, ReadPartialReadsAndEOF) {
ExtentsFile file(std::move(mock_file_ptr_), {ex_t{10, 1}, ex_t{20, 10}});
EXPECT_CALL(*mock_file_, Seek(_))
.Times(AnyNumber())
.WillRepeatedly(Return(true));
char* buf = reinterpret_cast<char*>(0x1234);
InSequence s;
EXPECT_CALL(*mock_file_, Read(buf, 1, _)).WillOnce(SucceedIO());
EXPECT_CALL(*mock_file_, Read(buf + 1, _, _)).WillOnce(SucceedPartialIO(3));
EXPECT_CALL(*mock_file_, Read(buf + 4, _, _)).WillOnce(SucceedPartialIO(0));
size_t bytes_read = 0;
EXPECT_TRUE(file.Read(buf, 100, &bytes_read));
EXPECT_EQ(4U, bytes_read);
}
} // namespace bsdiff
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