Add xz compression and decompression tests with CMake integration

tests/CMakeLists.txt

@@ -75,9 +75,12 @@ file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/data/ha_asc.bin
 file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/data/ha_hsc.bin
      DESTINATION ${CMAKE_CURRENT_BINARY_DIR}/data/)
 
+file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/data/xz.xz
+     DESTINATION ${CMAKE_CURRENT_BINARY_DIR}/data/)
+
 # 'Google_Tests_run' is the target name
 # 'test1.cpp tests2.cpp' are source files with tests
 add_executable(tests_run apple_rle.cpp crc32.c crc32.h adc.cpp bzip2.cpp lzip.cpp lzfse.cpp zstd.cpp lzma.cpp flac.cpp lz4.cpp
                zoo/lzd.cpp arc/pack.cpp lh5.cpp arc/squeeze.cpp arc/crunch.cpp arc/squash.cpp pak/crush.cpp
-               pak/distill.cpp ha.cpp)
+               pak/distill.cpp ha.cpp xz.cpp)
 target_link_libraries(tests_run gtest gtest_main "Aaru.Compression.Native")

tests/xz.cpp

@@ -0,0 +1,135 @@
+/*
+ * This file is part of the Aaru Data Preservation Suite.
+ * Copyright (c) 2019-2026 Natalia Portillo.
+ *
+ * This library is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of the
+ * License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <climits>
+#include <cstddef>
+#include <cstdint>
+
+#include "../library.h"
+#include "crc32.h"
+#include "gtest/gtest.h"
+
+#define EXPECTED_CRC32 0xc64059c0
+
+static const uint8_t *buffer;
+
+class xzFixture : public ::testing::Test
+{
+public:
+    xzFixture()
+    {
+        // initialization;
+        // can also be done in SetUp()
+    }
+
+protected:
+    void SetUp()
+    {
+        char path[PATH_MAX];
+        char filename[PATH_MAX];
+
+        getcwd(path, PATH_MAX);
+        snprintf(filename, PATH_MAX, "%s/data/xz.xz", path);
+
+        FILE *file = fopen(filename, "rb");
+        buffer     = (const uint8_t *)malloc(1048696);
+        fread((void *)buffer, 1, 1048696, file);
+        fclose(file);
+    }
+
+    void TearDown() { free((void *)buffer); }
+
+    ~xzFixture()
+    {
+        // resources cleanup, no exceptions allowed
+    }
+
+    // shared user data
+};
+
+TEST_F(xzFixture, xz)
+{
+    auto *outBuf = (uint8_t *)malloc(1048576);
+
+    size_t decoded = 1048576;
+    auto res = AARU_xz_decode_buffer(outBuf, &decoded, buffer, 1048696);
+
+    EXPECT_EQ(res, 0);
+    EXPECT_EQ(decoded, 1048576);
+
+    auto crc = crc32_data(outBuf, 1048576);
+
+    free(outBuf);
+
+    EXPECT_EQ(crc, EXPECTED_CRC32);
+}
+
+TEST_F(xzFixture, xzCompress)
+{
+    size_t         original_len = 8388608;
+    uint           cmp_len      = original_len;
+    uint           decmp_len    = original_len;
+    char           path[PATH_MAX];
+    char           filename[PATH_MAX * 2];
+    FILE          *file;
+    uint32_t       original_crc, decmp_crc;
+    const uint8_t *original;
+    uint8_t       *cmp_buffer;
+    uint8_t       *decmp_buffer;
+    size_t         newSize;
+
+    // Allocate buffers
+    original     = (const uint8_t *)malloc(original_len);
+    cmp_buffer   = (uint8_t *)malloc(cmp_len);
+    decmp_buffer = (uint8_t *)malloc(decmp_len);
+
+    // Read the file
+    getcwd(path, PATH_MAX);
+    snprintf(filename, PATH_MAX, "%s/data/data.bin", path);
+
+    file = fopen(filename, "rb");
+    fread((void *)original, 1, original_len, file);
+    fclose(file);
+
+    // Calculate the CRC
+    original_crc = crc32_data(original, original_len);
+
+    // Compress
+    newSize = cmp_len;
+    int32_t res = AARU_xz_encode_buffer(cmp_buffer, &newSize, original, original_len, 9, 10);
+    cmp_len = newSize;
+
+    EXPECT_EQ(res, 0);
+
+    // Decompress
+    newSize   = decmp_len;
+    res   = AARU_xz_decode_buffer(decmp_buffer, &newSize, cmp_buffer, cmp_len);
+    decmp_len = newSize;
+
+    EXPECT_EQ(res, 0);
+    EXPECT_EQ(decmp_len, original_len);
+
+    decmp_crc = crc32_data(decmp_buffer, decmp_len);
+
+    // Free buffers
+    free((void *)original);
+    free(cmp_buffer);
+    free(decmp_buffer);
+
+    EXPECT_EQ(decmp_crc, original_crc);
+}