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/*
* nanowasm, a tiny WebAssembly/Wasm interpreter
* Copyright (C) 2023-2024 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 <nw/log.h>
#include <nw/sections.h>
#include <nanowasm/nw.h>
#include <nw/types.h>
#include <errno.h>
#include <limits.h>
#include <stddef.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
static int run(FILE *const f, const varuint32 idx,
struct section_function *const out)
{
varuint32 count;
if (varuint32_read(f, &count))
{
LOG("%s: varuint32_read count failed\n", __func__);
return -1;
}
for (varuint32 i = 0; i < count; i++)
{
varuint32 type;
if (varuint32_read(f, &type))
{
LOG("%s: varuint32_read type failed\n", __func__);
return -1;
}
else if (out && i == idx)
{
out->type = type;
out->nreturn = count;
return 0;
}
}
if (out)
{
LOG("%s: could not find function index %ju\n", __func__,
(uintmax_t)idx);
return -1;
}
return 0;
}
int section_function_check(const struct section *const s,
struct nw_mod *const m, const unsigned long len)
{
FILE *const f = s->f;
if (m->sections.function)
{
LOG("%s: ignoring duplicate section\n", __func__);
return fseek(f, len, SEEK_CUR);
}
const long start = ftell(f);
if (start < 0)
{
LOG("%s: ftell(3): %s\n", __func__, strerror(errno));
return -1;
}
else if (run(f, 0, NULL))
{
LOG("%s: run failed\n", __func__);
return -1;
}
const long end = ftell(f);
if (end < 0)
{
LOG("%s: ftell(3): %s\n", __func__, strerror(errno));
return -1;
}
const unsigned long size = end - start;
if (size != len)
{
LOG("%s: size exceeded (%lu expected, got %lu)\n",
__func__, len, size);
return -1;
}
m->sections.function = start;
return 0;
}
int section_function(const struct section *const s,
const struct nw_mod *const m, const varuint32 idx,
struct section_function *const f)
{
const long offset = m->sections.function;
if (offset <= 0)
{
LOG("%s: function section not found", __func__);
return -1;
}
else if (fseek(s->f, offset, SEEK_SET))
{
LOG("%s: fseek(3): %s\n", __func__, strerror(errno));
return -1;
}
return run(s->f, idx, f);
}
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