1 files changed, 167 insertions, 0 deletions
diff --git a/tests/util/zstream.c b/tests/util/zstream.c
new file mode 100644
index 000000000..5c89895c7
--- /dev/null
+++ b/tests/util/zstream.c
@@ -0,0 +1,167 @@
+#include "clar_libgit2.h"
+#include "zstream.h"
+
+static const char *data = "This is a test test test of This is a test";
+
+#define INFLATE_EXTRA 2
+
+static void assert_zlib_equal_(
+	const void *expected, size_t e_len,
+	const void *compressed, size_t c_len,
+	const char *msg, const char *file, const char *func, int line)
+{
+	z_stream stream;
+	char *expanded = git__calloc(1, e_len + INFLATE_EXTRA);
+	cl_assert(expanded);
+
+	memset(&stream, 0, sizeof(stream));
+	stream.next_out  = (Bytef *)expanded;
+	stream.avail_out = (uInt)(e_len + INFLATE_EXTRA);
+	stream.next_in   = (Bytef *)compressed;
+	stream.avail_in  = (uInt)c_len;
+
+	cl_assert(inflateInit(&stream) == Z_OK);
+	cl_assert(inflate(&stream, Z_FINISH));
+	inflateEnd(&stream);
+
+	clar__assert_equal(
+		file, func, line, msg, 1,
+		"%d", (int)stream.total_out, (int)e_len);
+	clar__assert_equal(
+		file, func, line, "Buffer len was not exact match", 1,
+		"%d", (int)stream.avail_out, (int)INFLATE_EXTRA);
+
+	clar__assert(
+		memcmp(expanded, expected, e_len) == 0,
+		file, func, line, "uncompressed data did not match", NULL, 1);
+
+	git__free(expanded);
+}
+
+#define assert_zlib_equal(E,EL,C,CL) \
+	assert_zlib_equal_(E, EL, C, CL, #EL " != " #CL, __FILE__, __func__, (int)__LINE__)
+
+void test_zstream__basic(void)
+{
+	git_zstream z = GIT_ZSTREAM_INIT;
+	char out[128];
+	size_t outlen = sizeof(out);
+
+	cl_git_pass(git_zstream_init(&z, GIT_ZSTREAM_DEFLATE));
+	cl_git_pass(git_zstream_set_input(&z, data, strlen(data) + 1));
+	cl_git_pass(git_zstream_get_output(out, &outlen, &z));
+	cl_assert(git_zstream_done(&z));
+	cl_assert(outlen > 0);
+	git_zstream_free(&z);
+
+	assert_zlib_equal(data, strlen(data) + 1, out, outlen);
+}
+
+void test_zstream__fails_on_trailing_garbage(void)
+{
+	git_str deflated = GIT_STR_INIT, inflated = GIT_STR_INIT;
+	char i = 0;
+
+	/* compress a simple string */
+	git_zstream_deflatebuf(&deflated, "foobar!!", 8);
+
+	/* append some garbage */
+	for (i = 0; i < 10; i++) {
+		git_str_putc(&deflated, i);
+	}
+
+	cl_git_fail(git_zstream_inflatebuf(&inflated, deflated.ptr, deflated.size));
+
+	git_str_dispose(&deflated);
+	git_str_dispose(&inflated);
+}
+
+void test_zstream__buffer(void)
+{
+	git_str out = GIT_STR_INIT;
+	cl_git_pass(git_zstream_deflatebuf(&out, data, strlen(data) + 1));
+	assert_zlib_equal(data, strlen(data) + 1, out.ptr, out.size);
+	git_str_dispose(&out);
+}
+
+#define BIG_STRING_PART "Big Data IS Big - Long Data IS Long - We need a buffer larger than 1024 x 1024 to make sure we trigger chunked compression - Big Big Data IS Bigger than Big - Long Long Data IS Longer than Long"
+
+static void compress_and_decompress_input_various_ways(git_str *input)
+{
+	git_str out1 = GIT_STR_INIT, out2 = GIT_STR_INIT;
+	git_str inflated = GIT_STR_INIT;
+	size_t i, fixed_size = max(input->size / 2, 256);
+	char *fixed = git__malloc(fixed_size);
+	cl_assert(fixed);
+
+	/* compress with deflatebuf */
+
+	cl_git_pass(git_zstream_deflatebuf(&out1, input->ptr, input->size));
+	assert_zlib_equal(input->ptr, input->size, out1.ptr, out1.size);
+
+	/* compress with various fixed size buffer (accumulating the output) */
+
+	for (i = 0; i < 3; ++i) {
+		git_zstream zs = GIT_ZSTREAM_INIT;
+		size_t use_fixed_size;
+
+		switch (i) {
+		case 0: use_fixed_size = 256; break;
+		case 1: use_fixed_size = fixed_size / 2; break;
+		case 2: use_fixed_size = fixed_size; break;
+		}
+		cl_assert(use_fixed_size <= fixed_size);
+
+		cl_git_pass(git_zstream_init(&zs, GIT_ZSTREAM_DEFLATE));
+		cl_git_pass(git_zstream_set_input(&zs, input->ptr, input->size));
+
+		while (!git_zstream_done(&zs)) {
+			size_t written = use_fixed_size;
+			cl_git_pass(git_zstream_get_output(fixed, &written, &zs));
+			cl_git_pass(git_str_put(&out2, fixed, written));
+		}
+
+		git_zstream_free(&zs);
+		assert_zlib_equal(input->ptr, input->size, out2.ptr, out2.size);
+
+		/* did both approaches give the same data? */
+		cl_assert_equal_sz(out1.size, out2.size);
+		cl_assert(!memcmp(out1.ptr, out2.ptr, out1.size));
+
+		git_str_dispose(&out2);
+	}
+
+	cl_git_pass(git_zstream_inflatebuf(&inflated, out1.ptr, out1.size));
+	cl_assert_equal_i(input->size, inflated.size);
+	cl_assert(memcmp(input->ptr, inflated.ptr, inflated.size) == 0);
+
+	git_str_dispose(&out1);
+	git_str_dispose(&inflated);
+	git__free(fixed);
+}
+
+void test_zstream__big_data(void)
+{
+	git_str in = GIT_STR_INIT;
+	size_t scan, target;
+
+	for (target = 1024; target <= 1024 * 1024 * 4; target *= 8) {
+
+		/* make a big string that's easy to compress */
+		git_str_clear(&in);
+		while (in.size < target)
+			cl_git_pass(
+				git_str_put(&in, BIG_STRING_PART, strlen(BIG_STRING_PART)));
+
+		compress_and_decompress_input_various_ways(&in);
+
+		/* make a big string that's hard to compress */
+		srand(0xabad1dea);
+		for (scan = 0; scan < in.size; ++scan)
+			in.ptr[scan] = (char)rand();
+
+		compress_and_decompress_input_various_ways(&in);
+	}
+
+	git_str_dispose(&in);
+}