thodg/libgit2/tests/core/zstream.c

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• Hash : 3fba5891
  Author :
  Date : 2019-01-20T23:53:33
  

  test: cast to a char the zstream test

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• tests/core/zstream.c

• #include "clar_libgit2.h"
  #include "buffer.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, 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, line, msg, 1,
  		"%d", (int)stream.total_out, (int)e_len);
  	clar__assert_equal(
  		file, 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, 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__, (int)__LINE__)
  
  void test_core_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_core_zstream__fails_on_trailing_garbage(void)
  {
  	git_buf deflated = GIT_BUF_INIT, inflated = GIT_BUF_INIT;
  	char i = 0;
  
  	/* compress a simple string */
  	git_zstream_deflatebuf(&deflated, "foobar!!", 8);
  
  	/* append some garbage */
  	for (i = 0; i < 10; i++) {
  		git_buf_putc(&deflated, i);
  	}
  
  	cl_git_fail(git_zstream_inflatebuf(&inflated, deflated.ptr, deflated.size));
  
  	git_buf_dispose(&deflated);
  	git_buf_dispose(&inflated);
  }
  
  void test_core_zstream__buffer(void)
  {
  	git_buf out = GIT_BUF_INIT;
  	cl_git_pass(git_zstream_deflatebuf(&out, data, strlen(data) + 1));
  	assert_zlib_equal(data, strlen(data) + 1, out.ptr, out.size);
  	git_buf_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_buf *input)
  {
  	git_buf out1 = GIT_BUF_INIT, out2 = GIT_BUF_INIT;
  	git_buf inflated = GIT_BUF_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_buf_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_buf_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_buf_dispose(&out1);
  	git_buf_dispose(&inflated);
  	git__free(fixed);
  }
  
  void test_core_zstream__big_data(void)
  {
  	git_buf in = GIT_BUF_INIT;
  	size_t scan, target;
  
  	for (target = 1024; target <= 1024 * 1024 * 4; target *= 8) {
  
  		/* make a big string that's easy to compress */
  		git_buf_clear(&in);
  		while (in.size < target)
  			cl_git_pass(
  				git_buf_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_buf_dispose(&in);
  }
  

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