The Tor Browser: modules/libmar/src/mar

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* vim:set ts=2 sw=2 sts=2 et cindent: */

     3 /* This Source Code Form is subject to the terms of the Mozilla Public

     4  * License, v. 2.0. If a copy of the MPL was not distributed with this

     5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     7 #ifndef MAR_PRIVATE_H__

     8 #define MAR_PRIVATE_H__

    10 #include "limits.h"

    11 #include "mozilla/Assertions.h"

    12 #include <stdint.h>

    14 #define BLOCKSIZE 4096

    15 #define ROUND_UP(n, incr) (((n) / (incr) + 1) * (incr))

    17 #define MAR_ID "MAR1"

    18 #define MAR_ID_SIZE 4

    20 /* The signature block comes directly after the header block

    21    which is 16 bytes */

    22 #define SIGNATURE_BLOCK_OFFSET 16

    24 /* Make sure the file is less than 500MB.  We do this to protect against

    25    invalid MAR files. */

    26 #define MAX_SIZE_OF_MAR_FILE ((int64_t)524288000)

    28 /* Existing code makes assumptions that the file size is

    29    smaller than LONG_MAX. */

    30 MOZ_STATIC_ASSERT(MAX_SIZE_OF_MAR_FILE < ((int64_t)LONG_MAX),

    31                   "max mar file size is too big");

    33 /* We store at most the size up to the signature block + 4

    34    bytes per BLOCKSIZE bytes */

    35 MOZ_STATIC_ASSERT(sizeof(BLOCKSIZE) < \

    36                   (SIGNATURE_BLOCK_OFFSET + sizeof(uint32_t)),

    37                   "BLOCKSIZE is too big");

    39 /* The maximum size of any signature supported by current and future

    40    implementations of the signmar program. */

    41 #define MAX_SIGNATURE_LENGTH 2048

    43 /* Each additional block has a unique ID.

    44    The product information block has an ID of 1. */

    45 #define PRODUCT_INFO_BLOCK_ID 1

    47 #define MAR_ITEM_SIZE(namelen) (3*sizeof(uint32_t) + (namelen) + 1)

    49 /* Product Information Block (PIB) constants */

    50 #define PIB_MAX_MAR_CHANNEL_ID_SIZE 63

    51 #define PIB_MAX_PRODUCT_VERSION_SIZE 31

    53 /* The mar program is compiled as a host bin so we don't have access to NSPR at

    54    runtime.  For that reason we use ntohl, htonl, and define HOST_TO_NETWORK64

    55    instead of the NSPR equivalents. */

    56 #ifdef XP_WIN

    57 #include <winsock2.h>

    58 #define ftello _ftelli64

    59 #define fseeko _fseeki64

    60 #else

    61 #define _FILE_OFFSET_BITS 64

    62 #include <netinet/in.h>

    63 #include <unistd.h>

    64 #endif

    66 #include <stdio.h>

    68 #define HOST_TO_NETWORK64(x) ( \

    69   ((((uint64_t) x) & 0xFF) << 56) | \

    70   ((((uint64_t) x) >> 8) & 0xFF) << 48) | \

    71   (((((uint64_t) x) >> 16) & 0xFF) << 40) | \

    72   (((((uint64_t) x) >> 24) & 0xFF) << 32) | \

    73   (((((uint64_t) x) >> 32) & 0xFF) << 24) | \

    74   (((((uint64_t) x) >> 40) & 0xFF) << 16) | \

    75   (((((uint64_t) x) >> 48) & 0xFF) << 8) | \

    76   (((uint64_t) x) >> 56)

    77 #define NETWORK_TO_HOST64 HOST_TO_NETWORK64

    79 #endif  /* MAR_PRIVATE_H__ */

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