+++ /dev/null
-/*
- * Copyright (C) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com>
- *
- * SPDX-License-Identifier: LGPL-2.1-only
- *
- */
-
-#include <common/dynamic-buffer.h>
-#include <common/buffer-view.h>
-#include <common/utils.h>
-
-/*
- * Round to (upper) power of two, val is returned if it already is a power of
- * two.
- */
-static
-size_t round_to_power_of_2(size_t val)
-{
- size_t rounded;
- const int order = utils_get_count_order_u64(val);
-
- LTTNG_ASSERT(order >= 0);
- rounded = (1ULL << order);
- LTTNG_ASSERT(rounded >= val);
-
- return rounded;
-}
-
-void lttng_dynamic_buffer_init(struct lttng_dynamic_buffer *buffer)
-{
- LTTNG_ASSERT(buffer);
- memset(buffer, 0, sizeof(*buffer));
-}
-
-int lttng_dynamic_buffer_append(struct lttng_dynamic_buffer *buffer,
- const void *buf, size_t len)
-{
- int ret = 0;
-
- if (!buffer || (!buf && len)) {
- ret = -1;
- goto end;
- }
-
- if (len == 0) {
- /* Not an error, no-op. */
- goto end;
- }
-
- LTTNG_ASSERT(buffer->_capacity >= buffer->size);
- if (buffer->_capacity < (len + buffer->size)) {
- ret = lttng_dynamic_buffer_set_capacity(buffer,
- buffer->_capacity +
- (len - (buffer->_capacity - buffer->size)));
- if (ret) {
- goto end;
- }
- }
-
- memcpy(buffer->data + buffer->size, buf, len);
- buffer->size += len;
-end:
- return ret;
-}
-
-int lttng_dynamic_buffer_append_buffer(struct lttng_dynamic_buffer *dst_buffer,
- const struct lttng_dynamic_buffer *src_buffer)
-{
- int ret;
-
- if (!dst_buffer || !src_buffer) {
- ret = -1;
- goto end;
- }
-
- ret = lttng_dynamic_buffer_append(dst_buffer, src_buffer->data,
- src_buffer->size);
-end:
- return ret;
-}
-
-int lttng_dynamic_buffer_append_view(struct lttng_dynamic_buffer *buffer,
- const struct lttng_buffer_view *src)
-{
- int ret;
-
- if (!buffer || !src) {
- ret = -1;
- goto end;
- }
-
- ret = lttng_dynamic_buffer_append(buffer, src->data,
- src->size);
-end:
- return ret;
-}
-
-int lttng_dynamic_buffer_set_size(struct lttng_dynamic_buffer *buffer,
- size_t new_size)
-{
- int ret = 0;
-
- if (!buffer) {
- goto end;
- }
-
- if (new_size == buffer->size) {
- goto end;
- }
-
- if (new_size > buffer->_capacity) {
- ret = lttng_dynamic_buffer_set_capacity(buffer, new_size);
- if (ret) {
- goto end;
- }
-
- memset(buffer->data + buffer->size, 0, new_size - buffer->size);
- } else if (new_size > buffer->size) {
- memset(buffer->data + buffer->size, 0, new_size - buffer->size);
- } else {
- /*
- * Shrinking size. There is no need to zero-out the newly
- * released memory as it will either be:
- * - overwritten by lttng_dynamic_buffer_append,
- * - expanded later, which will zero-out the memory
- *
- * Users of external APIs are encouraged to set the buffer's
- * size _before_ making such calls.
- */
- }
-
- buffer->size = new_size;
-end:
- return ret;
-}
-
-int lttng_dynamic_buffer_set_capacity(struct lttng_dynamic_buffer *buffer,
- size_t demanded_capacity)
-{
- int ret = 0;
- void *new_buf;
- size_t new_capacity = demanded_capacity ?
- round_to_power_of_2(demanded_capacity) : 0;
-
- if (!buffer || demanded_capacity < buffer->size) {
- /*
- * Shrinking a buffer's size by changing its capacity is
- * unsupported.
- */
- ret = -1;
- goto end;
- }
-
- if (new_capacity == buffer->_capacity) {
- goto end;
- }
-
- /* Memory is initialized by the size increases. */
- new_buf = realloc(buffer->data, new_capacity);
- if (!new_buf) {
- ret = -1;
- goto end;
- }
-
- buffer->data = new_buf;
- buffer->_capacity = new_capacity;
-end:
- return ret;
-}
-
-/* Release any memory used by the dynamic buffer. */
-void lttng_dynamic_buffer_reset(struct lttng_dynamic_buffer *buffer)
-{
- if (!buffer) {
- return;
- }
-
- buffer->size = 0;
- buffer->_capacity = 0;
- free(buffer->data);
- buffer->data = NULL;
-}
-
-size_t lttng_dynamic_buffer_get_capacity_left(
- struct lttng_dynamic_buffer *buffer)
-{
- if (!buffer) {
- return 0;
- }
-
- return buffer->_capacity - buffer->size;
-}