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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "io/FileInputStream.h"
#include "android-base/macros.h"
#include "android-base/test_utils.h"
#include "test/Test.h"
using ::android::StringPiece;
using ::testing::Eq;
using ::testing::NotNull;
using ::testing::StrEq;
namespace aapt {
namespace io {
TEST(FileInputStreamTest, NextAndBackup) {
std::string input = "this is a cool string";
TemporaryFile file;
ASSERT_THAT(TEMP_FAILURE_RETRY(write(file.fd, input.c_str(), input.size())), Eq(21));
lseek64(file.fd, 0, SEEK_SET);
// Use a small buffer size so that we can call Next() a few times.
FileInputStream in(file.fd, 10u);
ASSERT_FALSE(in.HadError());
EXPECT_THAT(in.ByteCount(), Eq(0u));
const char* buffer;
size_t size;
ASSERT_TRUE(in.Next(reinterpret_cast<const void**>(&buffer), &size)) << in.GetError();
ASSERT_THAT(size, Eq(10u));
ASSERT_THAT(buffer, NotNull());
EXPECT_THAT(in.ByteCount(), Eq(10u));
EXPECT_THAT(StringPiece(buffer, size), Eq("this is a "));
ASSERT_TRUE(in.Next(reinterpret_cast<const void**>(&buffer), &size));
ASSERT_THAT(size, Eq(10u));
ASSERT_THAT(buffer, NotNull());
EXPECT_THAT(in.ByteCount(), Eq(20u));
EXPECT_THAT(StringPiece(buffer, size), Eq("cool strin"));
in.BackUp(5u);
EXPECT_THAT(in.ByteCount(), Eq(15u));
ASSERT_TRUE(in.Next(reinterpret_cast<const void**>(&buffer), &size));
ASSERT_THAT(size, Eq(5u));
ASSERT_THAT(buffer, NotNull());
ASSERT_THAT(in.ByteCount(), Eq(20u));
EXPECT_THAT(StringPiece(buffer, size), Eq("strin"));
// Backup 1 more than possible. Should clamp.
in.BackUp(11u);
EXPECT_THAT(in.ByteCount(), Eq(10u));
ASSERT_TRUE(in.Next(reinterpret_cast<const void**>(&buffer), &size));
ASSERT_THAT(size, Eq(10u));
ASSERT_THAT(buffer, NotNull());
ASSERT_THAT(in.ByteCount(), Eq(20u));
EXPECT_THAT(StringPiece(buffer, size), Eq("cool strin"));
ASSERT_TRUE(in.Next(reinterpret_cast<const void**>(&buffer), &size));
ASSERT_THAT(size, Eq(1u));
ASSERT_THAT(buffer, NotNull());
ASSERT_THAT(in.ByteCount(), Eq(21u));
EXPECT_THAT(StringPiece(buffer, size), Eq("g"));
EXPECT_FALSE(in.Next(reinterpret_cast<const void**>(&buffer), &size));
EXPECT_FALSE(in.HadError());
}
} // namespace io
} // namespace aapt
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