1 /* test_deflate_bound.cc - Test deflateBound() with small buffers */
2
3 #include "zbuild.h"
4 #ifdef ZLIB_COMPAT
5 # include "zlib.h"
6 #else
7 # include "zlib-ng.h"
8 #endif
9
10 #include <stdio.h>
11 #include <stdint.h>
12 #include <stdlib.h>
13 #include <string.h>
14
15 #include "test_shared.h"
16
17 #include <gtest/gtest.h>
18
19 #define MAX_LENGTH (32)
20
21 typedef struct {
22 int32_t level;
23 int32_t window_size;
24 int32_t mem_level;
25 } deflate_bound_test;
26
27 static const deflate_bound_test tests[] = {
28 {0, MAX_WBITS + 16, 1},
29 {Z_BEST_SPEED, MAX_WBITS, MAX_MEM_LEVEL},
30 {Z_BEST_COMPRESSION, MAX_WBITS, MAX_MEM_LEVEL}
31 };
32
33 class deflate_bound_variant : public testing::TestWithParam<deflate_bound_test> {
34 public:
estimate(deflate_bound_test param)35 void estimate(deflate_bound_test param) {
36 PREFIX3(stream) c_stream;
37 int estimate_len = 0;
38 uint8_t *uncompressed = NULL;
39 uint8_t *out_buf = NULL;
40 int err;
41
42 uncompressed = (uint8_t *)malloc(MAX_LENGTH);
43 ASSERT_TRUE(uncompressed != NULL);
44 memset(uncompressed, 'a', MAX_LENGTH);
45
46 for (int32_t i = 0; i < MAX_LENGTH; i++) {
47 memset(&c_stream, 0, sizeof(c_stream));
48
49 c_stream.avail_in = i;
50 c_stream.next_in = (z_const unsigned char *)uncompressed;
51 c_stream.avail_out = 0;
52 c_stream.next_out = out_buf;
53
54 err = PREFIX(deflateInit2)(&c_stream, param.level, Z_DEFLATED,
55 param.window_size, param.mem_level, Z_DEFAULT_STRATEGY);
56 EXPECT_EQ(err, Z_OK);
57
58 /* calculate actual output length and update structure */
59 estimate_len = PREFIX(deflateBound)(&c_stream, i);
60 out_buf = (uint8_t *)malloc(estimate_len);
61
62 if (out_buf != NULL) {
63 /* update zlib configuration */
64 c_stream.avail_out = estimate_len;
65 c_stream.next_out = out_buf;
66
67 /* do the compression */
68 err = PREFIX(deflate)(&c_stream, Z_FINISH);
69 EXPECT_EQ(err, Z_STREAM_END) <<
70 "level: " << param.level << "\n" <<
71 "window_size: " << param.window_size << "\n" <<
72 "mem_level: " << param.mem_level << "\n" <<
73 "length: " << i;
74
75 free(out_buf);
76 }
77
78 err = PREFIX(deflateEnd)(&c_stream);
79 EXPECT_EQ(err, Z_OK);
80 }
81
82 free(uncompressed);
83 }
84 };
85
TEST_P(deflate_bound_variant,estimate)86 TEST_P(deflate_bound_variant, estimate) {
87 estimate(GetParam());
88 }
89
90 INSTANTIATE_TEST_SUITE_P(deflate_bound, deflate_bound_variant, testing::ValuesIn(tests));
91