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#include "compression.hh"
#include <cstddef>
#include <gtest/gtest.h>
namespace nix {
/* ----------------------------------------------------------------------------
* compress / decompress
* --------------------------------------------------------------------------*/
TEST(compress, compressWithUnknownMethod)
{
ASSERT_THROW(compress("invalid-method", "something-to-compress"), UnknownCompressionMethod);
}
TEST(compress, noneMethodDoesNothingToTheInput)
{
auto o = compress("none", "this-is-a-test");
ASSERT_EQ(o, "this-is-a-test");
}
TEST(decompress, decompressEmptyString)
{
// Empty-method decompression used e.g. by S3 store
// (Content-Encoding == "").
auto o = decompress("", "this-is-a-test");
ASSERT_EQ(o, "this-is-a-test");
}
/* ----------------------------------------------------------------------------
* compression sinks
* --------------------------------------------------------------------------*/
TEST(makeCompressionSink, noneSinkDoesNothingToInput)
{
auto method = "none";
StringSink strSink;
auto inputString = "slfja;sljfklsa;jfklsjfkl;sdjfkl;sadjfkl;sdjf;lsdfjsadlf";
auto sink = makeCompressionSink(method, strSink);
(*sink)(inputString);
sink->finish();
ASSERT_STREQ(strSink.s.c_str(), inputString);
}
/** Tests applied to all compression types */
class PerTypeCompressionTest : public testing::TestWithParam<const char *>
{};
/** Tests applied to non-passthrough compression types */
class PerTypeNonNullCompressionTest : public testing::TestWithParam<const char *>
{};
constexpr const char * COMPRESSION_TYPES_NONNULL[] = {
// libarchive
"bzip2",
"compress",
"gzip",
"lzip",
"lzma",
"xz",
"zstd",
// Uses external program via libarchive so cannot be used :(
/*
"grzip",
"lrzip",
"lzop",
"lz4",
*/
// custom
"br",
};
INSTANTIATE_TEST_SUITE_P(
compressionNonNull, PerTypeNonNullCompressionTest, testing::ValuesIn(COMPRESSION_TYPES_NONNULL)
);
INSTANTIATE_TEST_SUITE_P(
compressionNonNull, PerTypeCompressionTest, testing::ValuesIn(COMPRESSION_TYPES_NONNULL)
);
INSTANTIATE_TEST_SUITE_P(
compressionNull, PerTypeCompressionTest, testing::Values("none")
);
/* ---------------------------------------
* All compression types
* --------------------------------------- */
TEST_P(PerTypeCompressionTest, roundTrips)
{
auto method = GetParam();
auto str = "slfja;sljfklsa;jfklsjfkl;sdjfkl;sadjfkl;sdjf;lsdfjsadlf";
auto o = decompress(method, compress(method, str));
ASSERT_EQ(o, str);
}
TEST_P(PerTypeCompressionTest, longerThanBuffer)
{
// This is targeted originally at regression testing a brotli bug, but we might as well do it to
// everything
auto method = GetParam();
auto str = std::string(65536, 'a');
auto o = decompress(method, compress(method, str));
// This is just to not print 64k of "a" for most failures
ASSERT_EQ(o.length(), str.length());
ASSERT_EQ(o, str);
}
TEST_P(PerTypeCompressionTest, sinkAndSource)
{
auto method = GetParam();
auto inputString = "slfja;sljfklsa;jfklsjfkl;sdjfkl;sadjfkl;sdjf;lsdfjsadlf";
StringSink strSink;
auto sink = makeCompressionSink(method, strSink);
(*sink)(inputString);
sink->finish();
StringSource strSource{strSink.s};
auto decompressionSource = makeDecompressionSource(method, strSource);
ASSERT_STREQ(decompressionSource->drain().c_str(), inputString);
}
/* ---------------------------------------
* Non null compression types
* --------------------------------------- */
TEST_P(PerTypeNonNullCompressionTest, bogusInputDecompression)
{
auto param = GetParam();
auto bogus = "this data is bogus and should throw when decompressing";
ASSERT_THROW(decompress(param, bogus), CompressionError);
}
TEST_P(PerTypeNonNullCompressionTest, truncatedValidInput)
{
auto method = GetParam();
auto inputString = "the quick brown fox jumps over the lazy doggos";
auto compressed = compress(method, inputString);
/* n.b. This also tests zero-length input, which is also invalid.
* As of the writing of this comment, it returns empty output, but is
* allowed to throw a compression error instead. */
for (size_t i = 0u; i < compressed.length(); ++i) {
auto newCompressed = compressed.substr(compressed.length() - i);
try {
decompress(method, newCompressed);
// Success is acceptable as well, even though it is corrupt data.
// The compression method is not expected to provide integrity,
// just, not break explosively on bad input.
} catch (CompressionError &) {
// Acceptable
}
}
}
}
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