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sgverify.c
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sgverify.c
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/* Test sg interfaces */
#ifdef SG
#include <assert.h>
#include <sys/uio.h>
#include <stdlib.h>
#include "snappy.h"
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include "util.h"
#include <sys/stat.h>
#include "map.h"
#define REPEAT 20
#define N 5000
size_t sum_iov(struct iovec *iov, int n)
{
size_t len = 0;
int i;
for (i = 0; i < n; i++)
len += iov[i].iov_len;
return len;
}
static int rnd_seq;
int rand_seq(void)
{
++rnd_seq;
return rand();
}
void *iov_to_buf(struct iovec *iov, int n, size_t *len)
{
*len = sum_iov(iov, n);
void *p = malloc(*len);
int i;
unsigned offset = 0;
for (i = 0; i < n; i++) {
memcpy(p + offset, iov[i].iov_base, iov[i].iov_len);
offset += iov[i].iov_len;
}
return p;
}
void test_read(char *buf, int len)
{
int i;
for (i = 0; i < len; i++)
asm volatile("" :: "r" (buf[i]) : "memory");
}
void print_mismatch(char *a, char *b, int size)
{
int j;
int printed = 0;
for (j = 0; j < size; j++)
if (a[j] != b[j]) {
printf("%d: %x vs %x\n",
j,
((unsigned char *)a)[j],
((unsigned char *)b)[j]);
if (printed++ > 10)
break;
}
}
int main(int ac, char **av)
{
struct snappy_env env;
snappy_init_env_sg(&env, true);
srand(99);
#if 0
int j;
for (j = 0; j < 60016; j++)
rand_seq();
#endif
while (*++av) {
size_t st_size;
char *map = mapfile(*av, O_RDONLY, &st_size);
if (!map) {
perror(*av);
continue;
}
int k;
for (k = 0; k < REPEAT; k++) {
struct iovec in_iov[N];
int iv = 0;
size_t size = st_size;
size_t offset = 0;
int err;
unsigned rnd_seq_start = rnd_seq;
while (size > 0 && iv < N - 1) {
size_t len = rand_seq() % size + 1;
if (len > size)
len = size;
in_iov[iv].iov_base = malloc(len);
in_iov[iv].iov_len = len;
memcpy(in_iov[iv].iov_base,
map + offset,
len);
size -= len;
offset += len;
iv++;
}
in_iov[iv].iov_base = malloc(size);
in_iov[iv].iov_len = size;
iv++;
int j;
for (j = 0; j < iv; j++)
test_read(in_iov[j].iov_base, in_iov[j].iov_len);
assert (sum_iov(in_iov, iv) == st_size);
struct iovec out_iov[N];
int ov = 0;
size = snappy_max_compressed_length(st_size);
while (size > 0 && ov < N - 1) {
size_t len = rand_seq() % size + 1;
if (len > size)
len = size;
out_iov[ov].iov_len = len;
out_iov[ov].iov_base = malloc(len);
size -= len;
ov++;
}
out_iov[ov].iov_base = malloc(size);
out_iov[ov].iov_len = size;
ov++;
assert (sum_iov(out_iov, ov) ==
snappy_max_compressed_length(st_size));
size_t outlen_linear;
char *out_linear = malloc(snappy_max_compressed_length(st_size));
err = snappy_compress(&env, map, st_size, out_linear, &outlen_linear);
if (err < 0)
printf("linear compression of %s failed: %s\n", *av, strerror(-err));
size_t outlen;
err = snappy_compress_iov(&env, in_iov, iv, st_size,
out_iov, &ov, &outlen);
if (err < 0)
printf("compression of %s failed: %s\n", *av, strerror(-err));
assert(outlen == outlen_linear);
int w;
offset = 0;
for (w = 0; w < ov; w++) {
if (memcmp(out_iov[w].iov_base, out_linear + offset, out_iov[w].iov_len)) {
printf("compressed sg %d does not match\n", w);
print_mismatch(out_iov[w].iov_base, out_linear + offset,
out_iov[w].iov_len);
break;
}
offset += out_iov[w].iov_len;
}
char *obuf = malloc(st_size);
err = snappy_uncompress_iov(out_iov, ov, outlen, obuf);
if (err < 0)
printf("uncompression of %s failed: %s\n", *av, strerror(-err));
if (memcmp(obuf, map, st_size)) {
printf("comparison of %s failed, olen %zu, orig %zu, rnd_seq %d\n", *av,
outlen, st_size, rnd_seq_start);
print_mismatch(obuf, map, st_size);
}
for (w = 0; w < iv; w++)
free(in_iov[w].iov_base);
for (w = 0; w < ov; w++)
free(out_iov[w].iov_base);
free(obuf);
free(out_linear);
}
unmap_file(map, st_size);
}
return 0;
}
#else
int main(void) { return 0; }
#endif