/* Clears remaining memory of the path repo */
static apr_status_t pr_cleanup(void *data)
{
path_repo_t *repo = data;
int i;
#ifdef DEBUG
L1("path_repo: snapshot interval: %d\n", SNAPSHOT_INTERVAL);
L1("path_repo: cache size: %d\n", CACHE_SIZE);
L1("path_repo: stored deltas: %d kB\n", repo->delta_bytes / 1024);
L1("path_repo: stored deltas (raw): %d kB\n", repo->delta_bytes_raw / 1024);
L1("path_repo: total recon time: %ld ms\n", apr_time_msec(repo->recon_time));
L1("path_repo: total store time: %ld ms\n", apr_time_msec(repo->store_time));
L1("path_repo: cache miss rate: %.2f%% (%d of %d)\n", 100.0f*repo->cache_misses / (repo->cache_hits+repo->cache_misses), repo->cache_misses, (repo->cache_hits+repo->cache_misses));
#endif
cb_tree_clear(&repo->tree);
for (i = 0; i < repo->cache->nelts; i++) {
if (APR_ARRAY_IDX(repo->cache, i, pr_cache_entry_t).tree.root) {
cb_tree_clear(&APR_ARRAY_IDX(repo->cache, i, pr_cache_entry_t).tree);
}
}
mukv_close(repo->db);
#ifdef USE_SNAPPY
snappy_free_env(&repo->snappy_env);
#endif
return APR_SUCCESS;
}
static ssize_t compress_iov_to_buffer(struct trace_record *target, const struct iovec *iov, int iovcnt)
{
if (NULL == iov) {
errno = EFAULT;
return -1;
}
if (iovcnt < 1) {
return 0;
}
char *src_buf = iov[0].iov_base;
size_t input_len = iov[0].iov_len;
size_t compressed_length = 0;
struct snappy_env env;
int rc = snappy_init_env(&env);
if (rc < 0) {
goto finish;
}
if (iovcnt > 1) {
/* TODO: Snappy should be able to accept an input IOV directly. Since this support is currently broken we use a workaround instead. */
input_len = total_iovec_len(iov, iovcnt);
src_buf = malloc(input_len);
if ((NULL == src_buf) || (copy_iov_to_buffer(src_buf, iov, iovcnt) != (ssize_t) input_len)) {
rc = -errno;
goto finish;
}
}
if (input_len > 0) {
/* Don't bother compressing trailing padding chars. Those will be re-inserted by the reader. */
input_len -= trace_r_count_chr_occurrences(src_buf + 1, input_len - 1, TRACE_UNUSED_SPACE_FILL_VALUE);
rc = snappy_compress(&env, src_buf, input_len, (char *)target, &compressed_length);
}
finish:
snappy_free_env(&env);
if (src_buf != iov[0].iov_base) {
free(src_buf);
}
if (0 != rc) {
errno = -rc;
ERR("Buffer compression failed with err", errno, strerror(errno));
return (ssize_t) -1;
}
TRACE_ASSERT(((ssize_t) compressed_length > 0) || (0 == input_len));
return (ssize_t) compressed_length;
}
int ness_compress(ness_compress_method_t m,
const char *src,
uint32_t src_size,
char *dst,
uint32_t *dst_size)
{
int ret = NESS_OK;
switch (m) {
case NESS_NO_COMPRESS:
memcpy(dst + 1, src, src_size);
*dst_size = src_size + 1;
dst[0] = NESS_NO_COMPRESS;
break;
case NESS_SNAPPY_METHOD:
if (src_size == 0) {
*dst_size = 1;
} else {
size_t out_size;
int status;
struct snappy_env env;
snappy_init_env(&env);
status = snappy_compress(&env, src, src_size, dst + 1, &out_size);
snappy_free_env(&env);
if (status != 0) {
__ERROR("snappy compress error %d, src_size %d, dst_size %d",
status,
src_size,
dst_size);
ret = 0;
}
*dst_size = out_size + 1;
}
dst[0] = NESS_SNAPPY_METHOD;
break;
default:
ret = 0;
__ERROR("%s", "no compress method support!");
break;
}
return ret;
}
int ness_decompress(const char *src,
uint32_t src_size,
char *dst,
uint32_t dst_size)
{
int ret = NESS_OK;
/* compressed data is NULL */
if (src_size == 1)
return NESS_ERR;
switch (src[0] & 0xF) {
case NESS_NO_COMPRESS:
memcpy(dst, src + 1, src_size - 1);
break;
case NESS_SNAPPY_METHOD: {
int status;
struct snappy_env env;
snappy_init_env(&env);
status = snappy_uncompress(src + 1, src_size - 1, dst);
snappy_free_env(&env);
if (status != 0) {
__ERROR("snappy uncompress error %d", status);
ret = 0;
goto ERR;
}
(void)dst_size;
}
break;
default:
ret = 0;
__ERROR("%s", "no decompress method support!");
break;
}
ERR:
return ret;
}
static void snappy_exit(struct crypto_tfm *tfm)
{
struct snappy_ctx *ctx = crypto_tfm_ctx(tfm);
snappy_free_env(&ctx->env);
}
