mar_private.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* 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 http://mozilla.org/MPL/2.0/. */
 
#ifndef MAR_PRIVATE_H__
#define MAR_PRIVATE_H__
 
#include "limits.h"
#include "mozilla/Assertions.h"
#include <stdint.h>
 
#define BLOCKSIZE 4096
#define ROUND_UP(n, incr) (((n) / (incr) + 1) * (incr))
 
#define MAR_ID "MAR1"
#define MAR_ID_SIZE 4
 
/* The signature block comes directly after the header block
   which is 16 bytes */
#define SIGNATURE_BLOCK_OFFSET 16
 
/* Make sure the file is less than 500MB.  We do this to protect against
   invalid MAR files. */
#define MAX_SIZE_OF_MAR_FILE ((int64_t)1824288000)
 
/* Existing code makes assumptions that the file size is
   smaller than LONG_MAX. */
MOZ_STATIC_ASSERT(MAX_SIZE_OF_MAR_FILE < ((int64_t)LONG_MAX),
                  "max mar file size is too big");
 
/* We store at most the size up to the signature block + 4
   bytes per BLOCKSIZE bytes */
MOZ_STATIC_ASSERT(sizeof(BLOCKSIZE) <
                  (SIGNATURE_BLOCK_OFFSET + sizeof(uint32_t)),
                  "BLOCKSIZE is too big");
 
/* The maximum size of any signature supported by current and future
   implementations of the signmar program. */
#define MAX_SIGNATURE_LENGTH 2048
 
/* Each additional block has a unique ID.
   The product information block has an ID of 1. */
#define PRODUCT_INFO_BLOCK_ID 1
 
#define MAR_ITEM_SIZE(namelen) (3*sizeof(uint32_t) + (namelen) + 1)
 
/* Product Information Block (PIB) constants */
#define PIB_MAX_MAR_CHANNEL_ID_SIZE 63
#define PIB_MAX_PRODUCT_VERSION_SIZE 31
 
/* The mar program is compiled as a host bin so we don't have access to NSPR at
   runtime.  For that reason we use ntohl, htonl, and define HOST_TO_NETWORK64
   instead of the NSPR equivalents. */
#ifdef _WIN32
#include <winsock2.h>
#define ftello _ftelli64
#define fseeko _fseeki64
#else
#define _FILE_OFFSET_BITS 64
#include <netinet/in.h>
#include <unistd.h>
#endif
 
#include <stdio.h>
 
#define HOST_TO_NETWORK64(x) ( \
  ((((uint64_t) x) & 0xFF) << 56) | \
  ((((uint64_t) x) >> 8) & 0xFF) << 48) | \
  (((((uint64_t) x) >> 16) & 0xFF) << 40) | \
  (((((uint64_t) x) >> 24) & 0xFF) << 32) | \
  (((((uint64_t) x) >> 32) & 0xFF) << 24) | \
  (((((uint64_t) x) >> 40) & 0xFF) << 16) | \
  (((((uint64_t) x) >> 48) & 0xFF) << 8) | \
  (((uint64_t) x) >> 56)
#define NETWORK_TO_HOST64 HOST_TO_NETWORK64
 
#endif  /* MAR_PRIVATE_H__ */