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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Handles a buffer that can be allocated and freed
- *
- * Copyright 2021 Google LLC
- * Written by Simon Glass <sjg@chromium.org>
- */
- #ifndef USE_HOSTCC
- #include <common.h>
- #include <malloc.h>
- #include <mapmem.h>
- #include <string.h>
- #endif
- #include <abuf.h>
- void abuf_set(struct abuf *abuf, void *data, size_t size)
- {
- abuf_uninit(abuf);
- abuf->data = data;
- abuf->size = size;
- }
- #ifndef USE_HOSTCC
- void abuf_map_sysmem(struct abuf *abuf, ulong addr, size_t size)
- {
- abuf_set(abuf, map_sysmem(addr, size), size);
- }
- #else
- /* copied from lib/string.c for convenience */
- static char *memdup(const void *src, size_t len)
- {
- char *p;
- p = malloc(len);
- if (!p)
- return NULL;
- memcpy(p, src, len);
- return p;
- }
- #endif
- bool abuf_realloc(struct abuf *abuf, size_t new_size)
- {
- void *ptr;
- if (!new_size) {
- /* easy case, just need to uninit, freeing any allocation */
- abuf_uninit(abuf);
- return true;
- } else if (abuf->alloced) {
- /* currently allocated, so need to reallocate */
- ptr = realloc(abuf->data, new_size);
- if (!ptr)
- return false;
- abuf->data = ptr;
- abuf->size = new_size;
- return true;
- } else if (new_size <= abuf->size) {
- /*
- * not currently alloced and new size is no larger. Just update
- * it. Data is lost off the end if new_size < abuf->size
- */
- abuf->size = new_size;
- return true;
- } else {
- /* not currently allocated and new size is larger. Alloc and
- * copy in data. The new space is not inited.
- */
- ptr = malloc(new_size);
- if (!ptr)
- return false;
- if (abuf->size)
- memcpy(ptr, abuf->data, abuf->size);
- abuf->data = ptr;
- abuf->size = new_size;
- abuf->alloced = true;
- return true;
- }
- }
- void *abuf_uninit_move(struct abuf *abuf, size_t *sizep)
- {
- void *ptr;
- if (sizep)
- *sizep = abuf->size;
- if (!abuf->size)
- return NULL;
- if (abuf->alloced) {
- ptr = abuf->data;
- } else {
- ptr = memdup(abuf->data, abuf->size);
- if (!ptr)
- return NULL;
- }
- /* Clear everything out so there is no record of the data */
- abuf_init(abuf);
- return ptr;
- }
- void abuf_init_set(struct abuf *abuf, void *data, size_t size)
- {
- abuf_init(abuf);
- abuf_set(abuf, data, size);
- }
- void abuf_init_move(struct abuf *abuf, void *data, size_t size)
- {
- abuf_init_set(abuf, data, size);
- abuf->alloced = true;
- }
- void abuf_uninit(struct abuf *abuf)
- {
- if (abuf->alloced)
- free(abuf->data);
- abuf_init(abuf);
- }
- void abuf_init(struct abuf *abuf)
- {
- abuf->data = NULL;
- abuf->size = 0;
- abuf->alloced = false;
- }
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