tests/test-xbzrle.c

   1 /*
   2  * Xor Based Zero Run Length Encoding unit tests.
   3  *
   4  * Copyright 2013 Red Hat, Inc. and/or its affiliates
   5  *
   6  * Authors:
   7  *  Orit Wasserman  <owasserm@redhat.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  10  * See the COPYING file in the top-level directory.
  11  *
  12  */
  13 #include "qemu/osdep.h"
  14 #include "qemu-common.h"
  15 #include "qemu/cutils.h"
  16 #include "include/migration/migration.h"
  17
  18 #define PAGE_SIZE 4096
  19
  20 static void test_uleb(void)
  21 {
  22     uint32_t i, val;
  23     uint8_t buf[2];
  24     int encode_ret, decode_ret;
  25
  26     for (i = 0; i <= 0x3fff; i++) {
  27         encode_ret = uleb128_encode_small(&buf[0], i);
  28         decode_ret = uleb128_decode_small(&buf[0], &val);
  29         g_assert(encode_ret == decode_ret);
  30         g_assert(i == val);
  31     }
  32
  33     /* decode invalid value */
  34     buf[0] = 0x80;
  35     buf[1] = 0x80;
  36
  37     decode_ret = uleb128_decode_small(&buf[0], &val);
  38     g_assert(decode_ret == -1);
  39     g_assert(val == 0);
  40 }
  41
  42 static void test_encode_decode_zero(void)
  43 {
  44     uint8_t *buffer = g_malloc0(PAGE_SIZE);
  45     uint8_t *compressed = g_malloc0(PAGE_SIZE);
  46     int i = 0;
  47     int dlen = 0;
  48     int diff_len = g_test_rand_int_range(0, PAGE_SIZE - 1006);
  49
  50     for (i = diff_len; i > 0; i--) {
  51         buffer[1000 + i] = i;
  52     }
  53
  54     buffer[1000 + diff_len + 3] = 103;
  55     buffer[1000 + diff_len + 5] = 105;
  56
  57     /* encode zero page */
  58     dlen = xbzrle_encode_buffer(buffer, buffer, PAGE_SIZE, compressed,
  59                        PAGE_SIZE);
  60     g_assert(dlen == 0);
  61
  62     g_free(buffer);
  63     g_free(compressed);
  64 }
  65
  66 static void test_encode_decode_unchanged(void)
  67 {
  68     uint8_t *compressed = g_malloc0(PAGE_SIZE);
  69     uint8_t *test = g_malloc0(PAGE_SIZE);
  70     int i = 0;
  71     int dlen = 0;
  72     int diff_len = g_test_rand_int_range(0, PAGE_SIZE - 1006);
  73
  74     for (i = diff_len; i > 0; i--) {
  75         test[1000 + i] = i + 4;
  76     }
  77
  78     test[1000 + diff_len + 3] = 107;
  79     test[1000 + diff_len + 5] = 109;
  80
  81     /* test unchanged buffer */
  82     dlen = xbzrle_encode_buffer(test, test, PAGE_SIZE, compressed,
  83                                 PAGE_SIZE);
  84     g_assert(dlen == 0);
  85
  86     g_free(test);
  87     g_free(compressed);
  88 }
  89
  90 static void test_encode_decode_1_byte(void)
  91 {
  92     uint8_t *buffer = g_malloc0(PAGE_SIZE);
  93     uint8_t *test = g_malloc0(PAGE_SIZE);
  94     uint8_t *compressed = g_malloc(PAGE_SIZE);
  95     int dlen = 0, rc = 0;
  96     uint8_t buf[2];
  97
  98     test[PAGE_SIZE - 1] = 1;
  99
 100     dlen = xbzrle_encode_buffer(buffer, test, PAGE_SIZE, compressed,
 101                        PAGE_SIZE);
 102     g_assert(dlen == (uleb128_encode_small(&buf[0], 4095) + 2));
 103
 104     rc = xbzrle_decode_buffer(compressed, dlen, buffer, PAGE_SIZE);
 105     g_assert(rc == PAGE_SIZE);
 106     g_assert(memcmp(test, buffer, PAGE_SIZE) == 0);
 107
 108     g_free(buffer);
 109     g_free(compressed);
 110     g_free(test);
 111 }
 112
 113 static void test_encode_decode_overflow(void)
 114 {
 115     uint8_t *compressed = g_malloc0(PAGE_SIZE);
 116     uint8_t *test = g_malloc0(PAGE_SIZE);
 117     uint8_t *buffer = g_malloc0(PAGE_SIZE);
 118     int i = 0, rc = 0;
 119
 120     for (i = 0; i < PAGE_SIZE / 2 - 1; i++) {
 121         test[i * 2] = 1;
 122     }
 123
 124     /* encode overflow */
 125     rc = xbzrle_encode_buffer(buffer, test, PAGE_SIZE, compressed,
 126                               PAGE_SIZE);
 127     g_assert(rc == -1);
 128
 129     g_free(buffer);
 130     g_free(compressed);
 131     g_free(test);
 132 }
 133
 134 static void encode_decode_range(void)
 135 {
 136     uint8_t *buffer = g_malloc0(PAGE_SIZE);
 137     uint8_t *compressed = g_malloc(PAGE_SIZE);
 138     uint8_t *test = g_malloc0(PAGE_SIZE);
 139     int i = 0, rc = 0;
 140     int dlen = 0;
 141
 142     int diff_len = g_test_rand_int_range(0, PAGE_SIZE - 1006);
 143
 144     for (i = diff_len; i > 0; i--) {
 145         buffer[1000 + i] = i;
 146         test[1000 + i] = i + 4;
 147     }
 148
 149     buffer[1000 + diff_len + 3] = 103;
 150     test[1000 + diff_len + 3] = 107;
 151
 152     buffer[1000 + diff_len + 5] = 105;
 153     test[1000 + diff_len + 5] = 109;
 154
 155     /* test encode/decode */
 156     dlen = xbzrle_encode_buffer(test, buffer, PAGE_SIZE, compressed,
 157                                 PAGE_SIZE);
 158
 159     rc = xbzrle_decode_buffer(compressed, dlen, test, PAGE_SIZE);
 160     g_assert(rc < PAGE_SIZE);
 161     g_assert(memcmp(test, buffer, PAGE_SIZE) == 0);
 162
 163     g_free(buffer);
 164     g_free(compressed);
 165     g_free(test);
 166 }
 167
 168 static void test_encode_decode(void)
 169 {
 170     int i;
 171
 172     for (i = 0; i < 10000; i++) {
 173         encode_decode_range();
 174     }
 175 }
 176
 177 int main(int argc, char **argv)
 178 {
 179     g_test_init(&argc, &argv, NULL);
 180     g_test_rand_int();
 181     g_test_add_func("/xbzrle/uleb", test_uleb);
 182     g_test_add_func("/xbzrle/encode_decode_zero", test_encode_decode_zero);
 183     g_test_add_func("/xbzrle/encode_decode_unchanged",
 184                     test_encode_decode_unchanged);
 185     g_test_add_func("/xbzrle/encode_decode_1_byte", test_encode_decode_1_byte);
 186     g_test_add_func("/xbzrle/encode_decode_overflow",
 187                     test_encode_decode_overflow);
 188     g_test_add_func("/xbzrle/encode_decode", test_encode_decode);
 189
 190     return g_test_run();
 191 }