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/* SPDX-License-Identifier: copyleft-next-0.3.1 */
/* Copyright 2023 Kim Kuparinen < kimi.h.kuparinen@gmail.com > */
#include <string.h>
#include <stdlib.h>
#include <gran/mem/simple_mem.h>
struct simple_mem {
struct component component;
size_t size;
char buf[];
};
static stat simple_mem_write(struct simple_mem *mem, uintptr_t addr,
size_t size, char *buf)
{
uintptr_t offset = addr % mem->size;
if (offset + size > mem->size) {
error("write outside memory");
return ESIZE;
}
memcpy(mem->buf + offset, buf, size);
return OK;
}
static stat simple_mem_read(struct simple_mem *mem, uintptr_t addr, size_t size,
char *buf)
{
uintptr_t offset = addr % mem->size;
if (offset + size > mem->size) {
error("read outside memory");
return ESIZE;
}
memcpy(buf, mem->buf + offset, size);
return OK;
}
struct component *create_simple_mem(size_t size)
{
struct simple_mem *new = calloc(1, sizeof(struct simple_mem) + size);
if (!new)
return NULL;
new->size = size;
new->component.write = (write_callback)simple_mem_write;
new->component.read = (read_callback)simple_mem_read;
return (struct component *)new;
}
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