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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 <stdio.h>
#include <string.h>
static int check_memory_type(FILE *const f, struct resizable_limits *const r)
{
return check_resizable_limits(f, r);
}
static int check(FILE *const f, const unsigned long len,
struct resizable_limits *const r)
{
const long start = ftell(f);
if (start < 0)
{
LOG("%s: ftell(3): %s\n", __func__, strerror(errno));
return -1;
}
varuint32 count;
if (varuint32_read(f, &count))
{
LOG("%s: varuint32_read failed\n", __func__);
return 1;
}
else if (count > 1)
{
LOG("%s: only 1 memory allowed\n", __func__);
return 1;
}
for (varuint32 i = 0; i < count; i++)
if (check_memory_type(f, r))
{
LOG("%s: check_memory_type 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;
}
return 0;
}
int section_memory_check(const struct section *const s, struct nw_mod *const m,
const unsigned long len)
{
FILE *const f = s->f;
if (m->sections.memory)
{
LOG("%s: ignoring duplicate section\n", __func__);
return fseek(f, len, SEEK_CUR);
}
const long offset = ftell(f);
struct resizable_limits r;
if (offset < 0)
{
LOG("%s: ftell(3): %s\n", __func__, strerror(errno));
return -1;
}
else if (check(f, len, &r))
{
LOG("%s: check failed\n", __func__);
return -1;
}
m->heap_len = r.sz;
m->sections.memory = offset;
return 0;
}
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