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| //===- llvm/unittest/Support/TarWriterTest.cpp ----------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/Support/TarWriter.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/MemoryBuffer.h"
#include "gtest/gtest.h"
#include <vector>
using namespace llvm;
namespace {
struct UstarHeader {
char Name[100];
char Mode[8];
char Uid[8];
char Gid[8];
char Size[12];
char Mtime[12];
char Checksum[8];
char TypeFlag;
char Linkname[100];
char Magic[6];
char Version[2];
char Uname[32];
char Gname[32];
char DevMajor[8];
char DevMinor[8];
char Prefix[155];
char Pad[12];
};
class TarWriterTest : public ::testing::Test {};
static std::vector<uint8_t> createTar(StringRef Base, StringRef Filename) {
// Create a temporary file.
SmallString<128> Path;
std::error_code EC =
sys::fs::createTemporaryFile("TarWriterTest", "tar", Path);
EXPECT_FALSE((bool)EC);
// Create a tar file.
Expected<std::unique_ptr<TarWriter>> TarOrErr = TarWriter::create(Path, Base);
EXPECT_TRUE((bool)TarOrErr);
std::unique_ptr<TarWriter> Tar = std::move(*TarOrErr);
Tar->append(Filename, "contents");
Tar.reset();
// Read the tar file.
ErrorOr<std::unique_ptr<MemoryBuffer>> MBOrErr = MemoryBuffer::getFile(Path);
EXPECT_TRUE((bool)MBOrErr);
std::unique_ptr<MemoryBuffer> MB = std::move(*MBOrErr);
std::vector<uint8_t> Buf((const uint8_t *)MB->getBufferStart(),
(const uint8_t *)MB->getBufferEnd());
// Windows does not allow us to remove a mmap'ed files, so
// unmap first and then remove the temporary file.
MB = nullptr;
sys::fs::remove(Path);
return Buf;
}
static UstarHeader createUstar(StringRef Base, StringRef Filename) {
std::vector<uint8_t> Buf = createTar(Base, Filename);
EXPECT_TRUE(Buf.size() >= sizeof(UstarHeader));
return *reinterpret_cast<const UstarHeader *>(Buf.data());
}
TEST_F(TarWriterTest, Basics) {
UstarHeader Hdr = createUstar("base", "file");
EXPECT_EQ("ustar", StringRef(Hdr.Magic));
EXPECT_EQ("00", StringRef(Hdr.Version, 2));
EXPECT_EQ("base/file", StringRef(Hdr.Name));
EXPECT_EQ("00000000010", StringRef(Hdr.Size));
}
TEST_F(TarWriterTest, LongFilename) {
std::string x154(154, 'x');
std::string x155(155, 'x');
std::string y99(99, 'y');
std::string y100(100, 'y');
UstarHeader Hdr1 = createUstar("", x154 + "/" + y99);
EXPECT_EQ("/" + x154, StringRef(Hdr1.Prefix));
EXPECT_EQ(y99, StringRef(Hdr1.Name));
UstarHeader Hdr2 = createUstar("", x155 + "/" + y99);
EXPECT_EQ("", StringRef(Hdr2.Prefix));
EXPECT_EQ("", StringRef(Hdr2.Name));
UstarHeader Hdr3 = createUstar("", x154 + "/" + y100);
EXPECT_EQ("", StringRef(Hdr3.Prefix));
EXPECT_EQ("", StringRef(Hdr3.Name));
UstarHeader Hdr4 = createUstar("", x155 + "/" + y100);
EXPECT_EQ("", StringRef(Hdr4.Prefix));
EXPECT_EQ("", StringRef(Hdr4.Name));
std::string yz = "yyyyyyyyyyyyyyyyyyyy/zzzzzzzzzzzzzzzzzzzz";
UstarHeader Hdr5 = createUstar("", x154 + "/" + yz);
EXPECT_EQ("/" + x154, StringRef(Hdr5.Prefix));
EXPECT_EQ(yz, StringRef(Hdr5.Name));
}
TEST_F(TarWriterTest, Pax) {
std::vector<uint8_t> Buf = createTar("", std::string(200, 'x'));
EXPECT_TRUE(Buf.size() >= 1024);
auto *Hdr = reinterpret_cast<const UstarHeader *>(Buf.data());
EXPECT_EQ("", StringRef(Hdr->Prefix));
EXPECT_EQ("", StringRef(Hdr->Name));
StringRef Pax = StringRef((char *)(Buf.data() + 512), 512);
EXPECT_TRUE(Pax.startswith("211 path=/" + std::string(200, 'x')));
}
TEST_F(TarWriterTest, SingleFile) {
SmallString<128> Path;
std::error_code EC =
sys::fs::createTemporaryFile("TarWriterTest", "tar", Path);
EXPECT_FALSE((bool)EC);
Expected<std::unique_ptr<TarWriter>> TarOrErr = TarWriter::create(Path, "");
EXPECT_TRUE((bool)TarOrErr);
std::unique_ptr<TarWriter> Tar = std::move(*TarOrErr);
Tar->append("FooPath", "foo");
Tar.reset();
uint64_t TarSize;
EC = sys::fs::file_size(Path, TarSize);
EXPECT_FALSE((bool)EC);
EXPECT_EQ(TarSize, 2048ULL);
}
TEST_F(TarWriterTest, NoDuplicate) {
SmallString<128> Path;
std::error_code EC =
sys::fs::createTemporaryFile("TarWriterTest", "tar", Path);
EXPECT_FALSE((bool)EC);
Expected<std::unique_ptr<TarWriter>> TarOrErr = TarWriter::create(Path, "");
EXPECT_TRUE((bool)TarOrErr);
std::unique_ptr<TarWriter> Tar = std::move(*TarOrErr);
Tar->append("FooPath", "foo");
Tar->append("BarPath", "bar");
Tar.reset();
uint64_t TarSize;
EC = sys::fs::file_size(Path, TarSize);
EXPECT_FALSE((bool)EC);
EXPECT_EQ(TarSize, 3072ULL);
}
TEST_F(TarWriterTest, Duplicate) {
SmallString<128> Path;
std::error_code EC =
sys::fs::createTemporaryFile("TarWriterTest", "tar", Path);
EXPECT_FALSE((bool)EC);
Expected<std::unique_ptr<TarWriter>> TarOrErr = TarWriter::create(Path, "");
EXPECT_TRUE((bool)TarOrErr);
std::unique_ptr<TarWriter> Tar = std::move(*TarOrErr);
Tar->append("FooPath", "foo");
Tar->append("FooPath", "bar");
Tar.reset();
uint64_t TarSize;
EC = sys::fs::file_size(Path, TarSize);
EXPECT_FALSE((bool)EC);
EXPECT_EQ(TarSize, 2048ULL);
}
} // namespace
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