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// Copyright 2017 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/diff_encoder.h"
#include <memory>
#include <vector>
#include <gtest/gtest.h>
#include "bsdiff/fake_patch_writer.h"
#include "bsdiff/test_utils.h"
namespace {
// Generated with:
// echo 'Hello World' | hexdump -v -e '" " 12/1 "0x%02x, " "\n"'
const uint8_t kHelloWorld[] = {
0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x20, 0x57, 0x6f, 0x72, 0x6c, 0x64, 0x0a,
};
} // namespace
namespace bsdiff {
class DiffEncoderTest : public testing::Test {
protected:
void SetUp() {
// By default, set the encoder to kHelloWorld to kHelloWorld.
diff_encoder_.reset(new DiffEncoder(&fake_patch_, kHelloWorld,
sizeof(kHelloWorld), kHelloWorld,
sizeof(kHelloWorld)));
}
FakePatchWriter fake_patch_;
std::unique_ptr<DiffEncoder> diff_encoder_;
};
TEST_F(DiffEncoderTest, CreateEmptyPatchTest) {
diff_encoder_.reset(new DiffEncoder(&fake_patch_, nullptr, 0, nullptr, 0));
EXPECT_TRUE(diff_encoder_->Init());
EXPECT_TRUE(diff_encoder_->Close());
// Both diff and extra stream must be empty stream, and not control entries.
EXPECT_EQ(0U, fake_patch_.entries().size());
EXPECT_TRUE(fake_patch_.diff_stream().empty());
EXPECT_TRUE(fake_patch_.extra_stream().empty());
}
TEST_F(DiffEncoderTest, AllInExtraStreamTest) {
diff_encoder_.reset(new DiffEncoder(&fake_patch_, nullptr, 0, kHelloWorld,
sizeof(kHelloWorld)));
EXPECT_TRUE(diff_encoder_->Init());
// Write to the extra stream in two parts: first 5 bytes, then the rest.
EXPECT_TRUE(diff_encoder_->AddControlEntry(ControlEntry(0, 5, 0)));
EXPECT_TRUE(diff_encoder_->AddControlEntry(
ControlEntry(0, sizeof(kHelloWorld) - 5, 0)));
EXPECT_TRUE(diff_encoder_->Close());
EXPECT_EQ(2U, fake_patch_.entries().size());
EXPECT_TRUE(fake_patch_.diff_stream().empty());
std::vector<uint8_t> hello_world(kHelloWorld,
kHelloWorld + sizeof(kHelloWorld));
EXPECT_EQ(hello_world, fake_patch_.extra_stream());
}
TEST_F(DiffEncoderTest, AllInDiffStreamTest) {
EXPECT_TRUE(diff_encoder_->Init());
EXPECT_TRUE(
diff_encoder_->AddControlEntry(ControlEntry(sizeof(kHelloWorld), 0, 0)));
EXPECT_TRUE(diff_encoder_->Close());
EXPECT_EQ(std::vector<uint8_t>(sizeof(kHelloWorld), 0),
fake_patch_.diff_stream());
EXPECT_TRUE(fake_patch_.extra_stream().empty());
}
TEST_F(DiffEncoderTest, OldPosNegativeErrorTest) {
EXPECT_TRUE(diff_encoder_->Init());
// Referencing negative values in oldpos is fine, until you use them.
EXPECT_TRUE(diff_encoder_->AddControlEntry(ControlEntry(0, 0, -5)));
EXPECT_TRUE(diff_encoder_->AddControlEntry(ControlEntry(0, 0, 2)));
EXPECT_FALSE(diff_encoder_->AddControlEntry(ControlEntry(1, 0, 0)));
}
// Test that using an oldpos past the end of the file fails.
TEST_F(DiffEncoderTest, OldPosTooBigErrorTest) {
EXPECT_TRUE(diff_encoder_->Init());
EXPECT_TRUE(
diff_encoder_->AddControlEntry(ControlEntry(0, 0, sizeof(kHelloWorld))));
EXPECT_FALSE(diff_encoder_->AddControlEntry(ControlEntry(1, 0, 0)));
}
// Test that diffing against a section of the old file past the end of the file
// fails.
TEST_F(DiffEncoderTest, OldPosPlusSizeTooBigErrorTest) {
EXPECT_TRUE(diff_encoder_->Init());
// The oldpos is set to a range inside the word, the we try to copy past the
// end of it.
EXPECT_TRUE(diff_encoder_->AddControlEntry(
ControlEntry(0, 0, sizeof(kHelloWorld) - 3)));
EXPECT_FALSE(
diff_encoder_->AddControlEntry(ControlEntry(sizeof(kHelloWorld), 0, 0)));
}
TEST_F(DiffEncoderTest, ExtraStreamTooBigErrorTest) {
EXPECT_TRUE(diff_encoder_->Init());
EXPECT_TRUE(diff_encoder_->AddControlEntry(ControlEntry(3, 0, 0)));
// This writes too many bytes in the stream because we already have 3 bytes.
EXPECT_FALSE(
diff_encoder_->AddControlEntry(ControlEntry(0, sizeof(kHelloWorld), 0)));
}
} // namespace bsdiff
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