feat: add skip-compress option

tests/integration/test_features.py

@@ -52,6 +52,35 @@ class TestArchiveMode:
         assert not mismatches, f"Mismatch: {mismatches}"
 
 
+class TestSkipCompress:
+    def test_skip_compress_case_insensitive(self, shared_server):
+        clean_dir(DEST_DIR)
+        with open(os.path.join(SOURCE_DIR, "skip-case.TXT"), "wb") as f:
+            f.write((b"skip compression case test\n" * 100))
+        result, _ = run_client(
+            SOURCE_DIR, DEST_DIR,
+            flags=["-c", "--skip-compress=.txt"],
+            port=shared_server.port,
+        )
+        assert result.returncode == 0, f"Skip-compress sync failed: {(result.stderr or result.stdout)[:200]}"
+        received = get_dest_received_dir(DEST_DIR, SOURCE_DIR)
+        with open(os.path.join(received, "skip-case.TXT"), "rb") as f:
+            assert f.read() == b"skip compression case test\n" * 100
+
+    def test_skip_compress_empty_list(self, shared_server):
+        clean_dir(DEST_DIR)
+        result, _ = run_client(
+            SOURCE_DIR, DEST_DIR,
+            flags=["-c", "--skip-compress="],
+            port=shared_server.port,
+        )
+        assert result.returncode == 0, f"Empty skip-compress sync failed: {(result.stderr or result.stdout)[:200]}"
+        received = get_dest_received_dir(DEST_DIR, SOURCE_DIR)
+        mismatches, missing = verify_transfer(SOURCE_DIR, received)
+        assert not missing, f"Missing: {missing}"
+        assert not mismatches, f"Mismatch: {mismatches}"
+
+
 class TestExclude:
     def test_exclude_single(self, shared_server):
         clean_dir(DEST_DIR)

tests/test_client_cli.c

@@ -247,6 +247,32 @@ static void test_parse_args_valid_compression_level() {
   config_delete(cfg);
 }
 
+static void test_parse_args_skip_compress() {
+  Config* cfg = config_create();
+  char* argv[] = {"fastsync", "--skip-compress=.ZIP, .GZ", "/src", "/dst"};
+  int positional_args[2];
+  int positional_count = 0;
+
+  EXPECT_EQ_INT(parse_args(cfg, 4, argv, positional_args, &positional_count), 0);
+  EXPECT_TRUE(cfg->skip_compress_set);
+  EXPECT_EQ_INT(cfg->skip_compress_count, 2);
+  EXPECT_EQ_STR(cfg->skip_compress_suffixes[0], ".ZIP");
+  EXPECT_EQ_STR(cfg->skip_compress_suffixes[1], ".GZ");
+  config_delete(cfg);
+}
+
+static void test_parse_args_empty_skip_compress() {
+  Config* cfg = config_create();
+  char* argv[] = {"fastsync", "--skip-compress=", "/src", "/dst"};
+  int positional_args[2];
+  int positional_count = 0;
+
+  EXPECT_EQ_INT(parse_args(cfg, 4, argv, positional_args, &positional_count), 0);
+  EXPECT_TRUE(cfg->skip_compress_set);
+  EXPECT_EQ_INT(cfg->skip_compress_count, 0);
+  config_delete(cfg);
+}
+
 /* Test parse_args unknown option returns error */
 static void test_parse_args_unknown_option() {
   Config* cfg = config_create();
@@ -357,6 +383,8 @@ void test_client_cli() {
   test_parse_args_invalid_server_port();
   test_parse_args_invalid_compression_level();
   test_parse_args_valid_compression_level();
+  test_parse_args_skip_compress();
+  test_parse_args_empty_skip_compress();
   test_parse_args_unknown_option();
   test_parse_args_rejects_unimplemented_options();
   test_parse_args_archive();

tests/test_compression.c

@@ -55,6 +55,14 @@ static void test_data_compress_decompress_large() {
   data_destroy(decompressed);
 }
 
+static void test_skip_compress_suffix_matching() {
+  char* suffixes[] = {".ZIP", ".GZ"};
+  EXPECT_TRUE(compression_should_skip_with_suffixes("archive.zip", suffixes, 2));
+  EXPECT_TRUE(compression_should_skip_with_suffixes("backup.TAR.GZ", suffixes, 2));
+  EXPECT_FALSE(compression_should_skip_with_suffixes("notes.txt", suffixes, 2));
+  EXPECT_FALSE(compression_should_skip_with_suffixes("archive.zip", suffixes, 0));
+}
+
 static void test_chunk_compress_decompress_roundtrip() {
   char* path1 = "temp_comp_test_1.txt";
   char* content1 = "chunk compression test file 1";
@@ -115,5 +123,6 @@ static void test_chunk_compress_decompress_roundtrip() {
 void test_compression() {
   test_data_compress_decompress_roundtrip();
   test_data_compress_decompress_large();
+  test_skip_compress_suffix_matching();
   test_chunk_compress_decompress_roundtrip();
 }