host/lib21/host_misc.c

/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 *
 * Host functions for verified boot.
 */

#include <stdio.h>
#include <unistd.h>

#include "2sysincludes.h"
#include "2common.h"
#include "2sha.h"
#include "vb2_common.h"
#include "host_common.h"

int vb2_read_file(const char *filename, uint8_t **data_ptr, uint32_t *size_ptr)
{
	FILE *f;
	uint8_t *buf;
	long size;

	*data_ptr = NULL;
	*size_ptr = 0;

	f = fopen(filename, "rb");
	if (!f) {
		VB2_DEBUG("Unable to open file %s\n", filename);
		return VB2_ERROR_READ_FILE_OPEN;
	}

	fseek(f, 0, SEEK_END);
	size = ftell(f);
	rewind(f);

	if (size < 0 || size > UINT32_MAX) {
		fclose(f);
		return VB2_ERROR_READ_FILE_SIZE;
	}

	buf = malloc(size);
	if (!buf) {
		fclose(f);
		return VB2_ERROR_READ_FILE_ALLOC;
	}

	if(1 != fread(buf, size, 1, f)) {
		VB2_DEBUG("Unable to read file %s\n", filename);
		fclose(f);
		free(buf);
		return VB2_ERROR_READ_FILE_DATA;
	}

	fclose(f);

	*data_ptr = buf;
	*size_ptr = size;
	return VB2_SUCCESS;
}

int vb2_write_file(const char *filename, const void *buf, uint32_t size)
{
	FILE *f = fopen(filename, "wb");

	if (!f) {
		VB2_DEBUG("Unable to open file %s\n", filename);
		return VB2_ERROR_WRITE_FILE_OPEN;
	}

	if (1 != fwrite(buf, size, 1, f)) {
		VB2_DEBUG("Unable to write to file %s\n", filename);
		fclose(f);
		unlink(filename);  /* Delete any partial file */
		return VB2_ERROR_WRITE_FILE_DATA;
	}

	fclose(f);
	return VB2_SUCCESS;
}

int vb2_write_object(const char *filename, const void *buf)
{
	const struct vb2_struct_common *cptr = buf;

	return vb2_write_file(filename, buf, cptr->total_size);
}

uint32_t vb2_desc_size(const char *desc)
{
	if (!desc || !*desc)
		return 0;

	return roundup32(strlen(desc) + 1);
}