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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 get_byte(struct nw_mod *);
static enum nw_state skip(struct nw_mod *const m)
{
const struct nw_sm_custom *const c = &m->sm.custom;
const struct nw_io_cfg *const cfg = &m->cfg.io;
const enum nw_state n = cfg->seek(c->start, cfg->user);
if (n)
return n;
nwp_section_skip(m);
return NW_AGAIN;
}
static enum nw_state compare(struct nw_mod *const m)
{
struct nw_sm_custom *const c = &m->sm.custom;
const struct entry *out = NULL;
size_t i;
static const struct entry
{
const char *section;
void (*f)(struct nw_mod *);
} s[] =
{
{"nw_to", nwp_section_to},
{"nw_fti", nwp_section_fti},
{"nw_fbo", nwp_section_fbo},
{"nw_lo", nwp_section_lo},
{"nw_iti", nwp_section_iti}
};
for (i = 0; i < sizeof s / sizeof *s; i++)
{
int *const candidate = &c->candidate[i];
const struct entry *const e = &s[i];
if (!*candidate)
continue;
else if (strlen(e->section) != c->name_len
|| e->section[c->len_i] != c->byte)
{
*candidate = 0;
continue;
}
out = e;
break;
}
if (++c->len_i >= c->name_len)
{
if (out)
{
if (m->c_sections[out - s])
{
#ifdef NW_LOG
nwp_log("duplicate section: %s\n", out->section);
#endif
return NW_FATAL;
}
out->f(m);
}
else
m->next = skip;
}
else
m->next = get_byte;
return NW_AGAIN;
}
static enum nw_state get_byte(struct nw_mod *const m)
{
const struct nw_io_cfg *const cfg = &m->cfg.io;
struct nw_sm_custom *const c = &m->sm.custom;
struct nw_sm_io io = {0};
enum nw_state n;
io.buf = &c->byte;
io.n = sizeof c->byte;
if ((n = nwp_io_read(cfg, &io, cfg->user)))
return n;
m->next = compare;
return NW_AGAIN;
}
static enum nw_state get_name_len(struct nw_mod *const m)
{
const struct nw_io_cfg *const cfg = &m->cfg.io;
struct nw_sm_custom *const c = &m->sm.custom;
struct nw_sm_leb128 *const l = &c->leb128;
const enum nw_state n = nwp_varuint32(cfg, l, &c->name_len, cfg->user);
if (n)
return n;
m->next = get_byte;
return NW_AGAIN;
}
static enum nw_state get_start(struct nw_mod *const m)
{
struct nw_sm_custom *const c = &m->sm.custom;
const struct nw_io_cfg *const cfg = &m->cfg.io;
const enum nw_state n = cfg->tell(&c->start, cfg->user);
if (n)
return n;
m->next = get_name_len;
return NW_AGAIN;
}
void nwp_section_custom(struct nw_mod *const m)
{
const struct nw_sm_custom c = {0};
struct nw_sm_custom *const pc = &m->sm.custom;
size_t i;
m->next = get_start;
*pc = c;
for (i = 0; i < sizeof pc->candidate / sizeof *pc->candidate; i++)
pc->candidate[i] = 1;
}
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