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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 <stdint.h>
#include <string.h>
static int check_string(FILE *const f)
{
varuint32 len;
if (varuint32_read(f, &len))
{
LOG("%s: varuint32_read failed\n", __func__);
return -1;
}
for (varuint32 i = 0; i < len; i++)
{
uint8_t byte;
if (!fread(&byte, sizeof byte, 1, f))
{
LOG("%s: fread(3) failed, feof=%d, ferror=%d\n",
__func__, feof(f), ferror(f));
return -1;
}
}
return 0;
}
static int check_kind(FILE *const f)
{
uint8_t kind;
if (!fread(&kind, sizeof kind, 1, f))
{
LOG("%s: fread(3) failed: feof=%d, ferror=%d\n", __func__,
feof(f), ferror(f));
return -1;
}
return 0;
}
static int check_index(FILE *const f)
{
varuint32 index;
if (varuint32_read(f, &index))
{
LOG("%s: varuint32_read failed\n", __func__);
return -1;
}
return 0;
}
static int check_export_entry(FILE *const f)
{
if (check_string(f))
{
LOG("%s: check_string failed\n", __func__);
return -1;
}
else if (check_kind(f))
{
LOG("%s: check_kind failed\n", __func__);
return -1;
}
else if (check_index(f))
{
LOG("%s: check_index failed\n", __func__);
return -1;
}
return 0;
}
static int check(FILE *const f, const unsigned long len)
{
const long start = ftell(f);
varuint32 count;
if (start < 0)
{
LOG("%s: ftell(3): %s\n", __func__, strerror(errno));
return -1;
}
else if (varuint32_read(f, &count))
{
LOG("%s: varuint32_read failed\n", __func__);
return -1;
}
for (varuint32 i = 0; i < count; i++)
if (check_export_entry(f))
{
LOG("%s: check_export_entry 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_export_check(const struct section *const s, struct nw_mod *const m,
const unsigned long len)
{
FILE *const f = s->f;
if (m->sections.export)
{
LOG("%s: ignoring duplicate section\n", __func__);
return fseek(f, len, SEEK_CUR);
}
const long offset = ftell(f);
if (offset < 0)
{
LOG("%s: ftell(3): %s\n", __func__, strerror(errno));
return -1;
}
else if (check(f, len))
{
LOG("%s: check failed\n", __func__);
return -1;
}
m->sections.export = offset;
return 0;
}
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