File size: 6,376 Bytes
e996a55 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 | #include "unity/unity.h"
#include "zlib.h"
#include <string.h>
#include <stdlib.h>
#include <stdint.h>
/* The function under test is local in deflate.c; a global wrapper is provided. */
extern unsigned test_read_buf(z_streamp strm, Bytef *buf, unsigned size);
static z_stream g_strm;
static void init_stream_with_wrap(int wrap_zlib)
{
memset(&g_strm, 0, sizeof(g_strm));
int windowBits = wrap_zlib ? 15 : -15; /* 15 -> zlib wrapper (wrap==1), -15 -> raw (wrap==0) */
int ret = deflateInit2_(&g_strm,
Z_DEFAULT_COMPRESSION,
Z_DEFLATED,
windowBits,
DEF_MEM_LEVEL,
Z_DEFAULT_STRATEGY,
ZLIB_VERSION,
(int)sizeof(z_stream));
TEST_ASSERT_EQUAL_INT(Z_OK, ret);
}
void setUp(void) {
/* No-op; tests initialize the stream per-case. */
}
void tearDown(void) {
if (g_strm.state != Z_NULL) {
(void)deflateEnd(&g_strm);
memset(&g_strm, 0, sizeof(g_strm));
}
}
static void set_input(const unsigned char *data, unsigned len)
{
g_strm.next_in = (z_const Bytef *)data;
g_strm.avail_in = len;
g_strm.total_in = 0;
}
void test_read_buf_zero_avail_returns_zero_and_no_changes(void)
{
init_stream_with_wrap(1); /* wrap == 1 (zlib) */
const unsigned char input[] = {0x10, 0x20, 0x30};
set_input(input, 0); /* no available input */
/* Pre-set fields to verify no changes occur */
const z_const Bytef *orig_next_in = g_strm.next_in;
g_strm.total_in = 7;
g_strm.adler = 0xDEADBEEF;
unsigned char out[8];
memset(out, 0xAA, sizeof(out));
unsigned got = test_read_buf(&g_strm, out, 5);
TEST_ASSERT_EQUAL_UINT(0, got);
TEST_ASSERT_EQUAL_UINT(0, g_strm.avail_in);
TEST_ASSERT_EQUAL_PTR(orig_next_in, g_strm.next_in);
TEST_ASSERT_EQUAL_UINT(7u, g_strm.total_in);
TEST_ASSERT_EQUAL_UINT32(0xDEADBEEF, (uint32_t)g_strm.adler);
TEST_ASSERT_EQUAL_UINT8(0xAA, out[0]); /* buffer untouched */
}
void test_read_buf_partial_copy_updates_counters_and_adler_wrap1(void)
{
init_stream_with_wrap(1); /* wrap == 1 (zlib) */
const unsigned char input[] = {'a','b','c','d','e','f','g','h','i'}; /* 9 bytes */
set_input(input, (unsigned)sizeof(input));
/* Set a known starting adler */
g_strm.adler = adler32(0L, Z_NULL, 0); /* 1 */
const z_const Bytef *orig_next_in = g_strm.next_in;
unsigned orig_avail = g_strm.avail_in;
unsigned char out[16];
memset(out, 0, sizeof(out));
unsigned req = 4;
unsigned got = test_read_buf(&g_strm, out, req);
TEST_ASSERT_EQUAL_UINT(req, got);
/* Output content */
TEST_ASSERT_EQUAL_UINT8_ARRAY(input, out, req);
/* Counters and pointers */
TEST_ASSERT_EQUAL_UINT(orig_avail - req, g_strm.avail_in);
TEST_ASSERT_EQUAL_PTR(orig_next_in + req, g_strm.next_in);
TEST_ASSERT_EQUAL_UINT(req, g_strm.total_in);
/* Adler updated over the bytes actually read */
uLong expected_adler = adler32(adler32(0L, Z_NULL, 0), out, req);
TEST_ASSERT_EQUAL_UINT32(expected_adler, (uint32_t)g_strm.adler);
}
void test_read_buf_size_exceeds_avail_reads_all_and_updates_adler(void)
{
init_stream_with_wrap(1); /* wrap == 1 (zlib) */
const unsigned char input[] = {1,2,3,4,5,6}; /* 6 bytes */
set_input(input, (unsigned)sizeof(input));
g_strm.adler = adler32(0L, Z_NULL, 0);
const z_const Bytef *orig_next_in = g_strm.next_in;
unsigned char out[32];
memset(out, 0, sizeof(out));
unsigned got = test_read_buf(&g_strm, out, 20); /* request more than avail */
TEST_ASSERT_EQUAL_UINT(sizeof(input), got);
TEST_ASSERT_EQUAL_UINT8_ARRAY(input, out, (unsigned)sizeof(input));
TEST_ASSERT_EQUAL_UINT(0, g_strm.avail_in);
TEST_ASSERT_EQUAL_PTR(orig_next_in + sizeof(input), g_strm.next_in);
TEST_ASSERT_EQUAL_UINT(sizeof(input), g_strm.total_in);
uLong expected_adler = adler32(adler32(0L, Z_NULL, 0), out, (unsigned)sizeof(input));
TEST_ASSERT_EQUAL_UINT32(expected_adler, (uint32_t)g_strm.adler);
}
void test_read_buf_wrap0_does_not_update_adler(void)
{
init_stream_with_wrap(0); /* wrap == 0 (raw) */
const unsigned char input[] = {9,8,7,6,5};
set_input(input, (unsigned)sizeof(input));
g_strm.adler = 0x11223344; /* sentinel */
unsigned char out[8];
memset(out, 0, sizeof(out));
unsigned got = test_read_buf(&g_strm, out, (unsigned)sizeof(input));
TEST_ASSERT_EQUAL_UINT(sizeof(input), got);
TEST_ASSERT_EQUAL_UINT8_ARRAY(input, out, (unsigned)sizeof(input));
TEST_ASSERT_EQUAL_UINT32(0x11223344, (uint32_t)g_strm.adler); /* unchanged */
}
void test_read_buf_multiple_calls_accumulate_total_in_and_adler(void)
{
init_stream_with_wrap(1); /* wrap == 1 (zlib) */
const unsigned char input[] = {10,20,30,40,50,60,70,80,90,100}; /* 10 bytes */
set_input(input, (unsigned)sizeof(input));
g_strm.adler = adler32(0L, Z_NULL, 0);
unsigned char out1[4] = {0};
unsigned char out2[4] = {0};
unsigned got1 = test_read_buf(&g_strm, out1, 3);
TEST_ASSERT_EQUAL_UINT(3, got1);
uLong expected_adler = adler32(adler32(0L, Z_NULL, 0), out1, got1);
TEST_ASSERT_EQUAL_UINT32(expected_adler, (uint32_t)g_strm.adler);
TEST_ASSERT_EQUAL_UINT(3, g_strm.total_in);
TEST_ASSERT_EQUAL_UINT(sizeof(input) - 3, g_strm.avail_in);
unsigned got2 = test_read_buf(&g_strm, out2, 4);
TEST_ASSERT_EQUAL_UINT(4, got2);
expected_adler = adler32(expected_adler, out2, got2);
TEST_ASSERT_EQUAL_UINT32(expected_adler, (uint32_t)g_strm.adler);
TEST_ASSERT_EQUAL_UINT(7, g_strm.total_in);
TEST_ASSERT_EQUAL_UINT(sizeof(input) - 7, g_strm.avail_in);
/* Verify the data copied in both calls is exactly the first 7 bytes */
TEST_ASSERT_EQUAL_UINT8_ARRAY(input, out1, got1);
TEST_ASSERT_EQUAL_UINT8_ARRAY(input + 3, out2, got2);
}
int main(void)
{
UNITY_BEGIN();
RUN_TEST(test_read_buf_zero_avail_returns_zero_and_no_changes);
RUN_TEST(test_read_buf_partial_copy_updates_counters_and_adler_wrap1);
RUN_TEST(test_read_buf_size_exceeds_avail_reads_all_and_updates_adler);
RUN_TEST(test_read_buf_wrap0_does_not_update_adler);
RUN_TEST(test_read_buf_multiple_calls_accumulate_total_in_and_adler);
return UNITY_END();
} |