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/*
* nanowasm, a tiny WebAssembly/Wasm interpreter
* Copyright (C) 2023-2025 Xavier Del Campo Romero
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/.
*/
#include <nanowasm/nw.h>
#include <nw/io.h>
#include <nw/log.h>
#include <nw/routines.h>
#include <string.h>
static enum nw_state run(struct nw_mod *const m)
{
static const unsigned char magic[] = {'\0', 'a', 's', 'm'};
struct nw_sm_cm *const cm = &m->sm.check_magic;
const struct nw_io_cfg *const cfg = &m->cfg.io;
const enum nw_state n = nwp_io_read(cfg, &cm->io, cfg->user);
if (n)
return n;
if (memcmp(cm->buf, magic, sizeof cm->buf))
{
#ifdef NW_LOG
nwp_log("wrong magic bytes\n");
#endif
return NW_FATAL;
}
nwp_check_version(m);
return NW_AGAIN;
}
void nwp_check_magic(struct nw_mod *const m)
{
const struct nw_sm_cm cm = {0};
struct nw_sm_cm *const pcm = &m->sm.check_magic;
struct nw_sm_io *const io = &pcm->io;
*pcm = cm;
io->buf = &pcm->buf;
io->n = sizeof pcm->buf;
m->next = run;
}
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