More tests.

Added basic deflate/inflate tests.
Added empty test case for gz.

tests/test_deflate.rb

@@ -0,0 +1,71 @@
+require "test/unit"
+require "ffi/zlib"
+require "tests/helper.rb"
+
+class TestDeflate < Test::Unit::TestCase
+
+    def setup
+        @data = File.read(File.join("tests", "support", "pale_blue_dot.txt"))
+        @buffer = FFI::MemoryPointer.new(@data.length)
+        @buffer.put_string(0, @data)
+    end
+
+    def test_deflate
+        s1 = do_test_deflate(FFI::Zlib::Z_NO_COMPRESSION)
+        s2 = do_test_deflate(FFI::Zlib::Z_BEST_SPEED)
+        s3 = do_test_deflate(FFI::Zlib::Z_DEFAULT_COMPRESSION)
+        s4 = do_test_deflate(FFI::Zlib::Z_BEST_COMPRESSION)
+
+        assert s1 > s2
+        assert s2 > s3
+        assert s3 >= s4
+    end
+
+    def do_test_deflate(level)
+        avail_out = @data.length + 64
+        compressed_buffer = FFI::MemoryPointer.new(avail_out)
+
+        zstream = FFI::Zlib::Z_stream.new
+        zstream[:next_in] = @buffer
+        zstream[:avail_in] = @data.length
+        zstream[:next_out] = compressed_buffer
+        zstream[:avail_out] = avail_out
+
+        result = FFI::Zlib.deflateInit(zstream, level)
+        assert_equal result, FFI::Zlib::Z_OK
+
+        result = FFI::Zlib.deflate(zstream, FFI::Zlib::Z_FINISH)
+        assert_equal result, FFI::Zlib::Z_STREAM_END
+
+        result = FFI::Zlib.deflateEnd(zstream)
+        assert_equal result, FFI::Zlib::Z_OK
+
+        compressed_size = zstream[:total_out]
+        assert compressed_size > 0
+        assert compressed_size <= @data.length if level != FFI::Zlib::Z_NO_COMPRESSION
+
+        decompressed_buffer = FFI::MemoryPointer.new(@data.length)
+        zstream = FFI::Zlib::Z_stream.new
+        zstream[:next_in] = compressed_buffer
+        zstream[:avail_in] = compressed_size
+        zstream[:next_out] = decompressed_buffer
+        zstream[:avail_out] = @data.length
+
+        result = FFI::Zlib.inflateInit(zstream)
+        assert_equal result, FFI::Zlib::Z_OK
+
+        result = FFI::Zlib.inflate(zstream, FFI::Zlib::Z_FINISH)
+        assert_equal result, FFI::Zlib::Z_STREAM_END
+
+        result = FFI::Zlib.inflateEnd(zstream)
+        assert_equal result, FFI::Zlib::Z_OK
+
+        decompressed_size = zstream[:total_out]
+        decompressed_data = decompressed_buffer.get_string(0, decompressed_size)
+        assert_equal decompressed_size, @data.length
+        assert_equal decompressed_data, @data
+
+        return compressed_size
+    end
+
+end

tests/test_gz.rb

@@ -0,0 +1,3 @@
+require "test/unit"
+require "ffi/zlib"
+require "tests/helper.rb"