static void
test_one(const struct test_vector *vec)
{
uint8_t md[SHA1_DIGEST_SIZE];
int i;
/* All at once. */
sha1_bytes(vec->data, vec->size, md);
assert(!memcmp(md, vec->output, SHA1_DIGEST_SIZE));
/* In two pieces. */
for (i = 0; i < 20; i++) {
int n0 = vec->size ? random_range(vec->size) : 0;
int n1 = vec->size - n0;
struct sha1_ctx sha1;
sha1_init(&sha1);
sha1_update(&sha1, vec->data, n0);
sha1_update(&sha1, vec->data + n0, n1);
sha1_final(&sha1, md);
assert(!memcmp(md, vec->output, SHA1_DIGEST_SIZE));
}
putchar('.');
fflush(stdout);
}
struct ovsdb_error *
ovsdb_log_write(struct ovsdb_log *file, struct json *json)
{
uint8_t sha1[SHA1_DIGEST_SIZE];
struct ovsdb_error *error;
char *json_string;
char header[128];
size_t length;
json_string = NULL;
if (file->mode == OVSDB_LOG_READ || file->write_error) {
file->mode = OVSDB_LOG_WRITE;
file->write_error = false;
if (fseeko(file->stream, file->offset, SEEK_SET)) {
error = ovsdb_io_error(errno, "%s: cannot seek to offset %lld",
file->name, (long long int) file->offset);
goto error;
}
if (ftruncate(fileno(file->stream), file->offset)) {
error = ovsdb_io_error(errno, "%s: cannot truncate to length %lld",
file->name, (long long int) file->offset);
goto error;
}
}
if (json->type != JSON_OBJECT && json->type != JSON_ARRAY) {
error = OVSDB_BUG("bad JSON type");
goto error;
}
/* Compose content. Add a new-line (replacing the null terminator) to make
* the file easier to read, even though it has no semantic value. */
json_string = json_to_string(json, 0);
length = strlen(json_string) + 1;
json_string[length - 1] = '\n';
/* Compose header. */
sha1_bytes(json_string, length, sha1);
snprintf(header, sizeof header, "%s%"PRIuSIZE" "SHA1_FMT"\n",
magic, length, SHA1_ARGS(sha1));
/* Write. */
if (fwrite(header, strlen(header), 1, file->stream) != 1
|| fwrite(json_string, length, 1, file->stream) != 1
|| fflush(file->stream))
{
error = ovsdb_io_error(errno, "%s: write failed", file->name);
/* Remove any partially written data, ignoring errors since there is
* nothing further we can do. */
ignore(ftruncate(fileno(file->stream), file->offset));
goto error;
}
file->offset += strlen(header) + length;
free(json_string);
return NULL;
error:
file->write_error = true;
free(json_string);
return error;
}