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// copyright (C) 2002, 2003 graydon hoare <graydon@pobox.com>
// all rights reserved.
// licensed to the public under the terms of the GNU GPL (>= 2)
// see the file COPYING for details
// this file contains magic constants which you could, in theory, tweak.
// probably best not to tweak them though.
#include "constants.hh"
#include "numeric_vocab.hh"
#include <boost/static_assert.hpp>
namespace constants
{
// number of bits in an RSA key we use
size_t const keylen = 1024;
// number of characters in a SHA1 id
size_t const idlen = 40;
// number of characters in an epoch_data
size_t const epochlen = idlen;
// number of characters in an epoch_data
size_t const epochlen_bytes = epochlen / 2;
// number of seconds in window, in which to consider CVS commits equivalent
// if they have otherwise compatible contents (author, changelog)
size_t const cvs_window = 3600 * 3;
// number of bytes in a password buffer. further bytes will be dropped.
size_t const maxpasswd = 0xfff;
// number of bytes to use in buffers, for buffered i/o operations
size_t const bufsz = 0xfff;
// size of a line of database traffic logging, beyond which lines will be
// truncated.
size_t const db_log_line_sz = 70;
// size in bytes of the database xdelta version reconstruction cache
size_t const db_version_cache_sz = 1 << 20;
// size of a line of text in the log buffer, beyond which log lines will be
// truncated.
size_t const log_line_sz = 0xff;
// all the ASCII characters (bytes) which are legal in a packet.
char const * const legal_packet_bytes =
// LDH characters
"abcdefghijklmnopqrstuvwxyz"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"0123456789"
"-"
// extra base64 codes
"+/="
// separators
".@[]"
// whitespace
" \r\n\t"
;
// all the ASCII characters (bytes) which are legal in a SHA1 hex id
char const * const legal_id_bytes =
"0123456789abcdef"
;
// all the ASCII characters (bytes) which are legal in an ACE string
char const * const legal_ace_bytes =
// LDH characters
"abcdefghijklmnopqrstuvwxyz"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"0123456789"
"-"
// label separators
".@"
;
// all the ASCII characters (bytes) which can occur in cert names
char const * const legal_cert_name_bytes =
// LDH characters
"abcdefghijklmnopqrstuvwxyz"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"0123456789"
"-"
;
// all the ASCII characters (bytes) which can occur in key names
char const * const legal_key_name_bytes =
// LDH characters
"abcdefghijklmnopqrstuvwxyz"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"0123456789"
"-"
// label and component separators
".@"
;
// all the ASCII characters (bytes) which are illegal in a (file|local)_path
char const illegal_path_bytes_arr[33] =
{
0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
0x7f, 0x00
}
;
char const * const illegal_path_bytes =
illegal_path_bytes_arr
;
// how many revisions back to verify the sanity of revisions before allowing
// them into the database
int const verify_depth = 4;
// merkle tree / netcmd / netsync related stuff
size_t const merkle_hash_length_in_bytes = 20;
size_t const merkle_fanout_bits = 4;
// all other merkle constants are derived
size_t const merkle_hash_length_in_bits = merkle_hash_length_in_bytes * 8;
size_t const merkle_num_tree_levels = merkle_hash_length_in_bits / merkle_fanout_bits;
size_t const merkle_num_slots = 1 << merkle_fanout_bits;
size_t const merkle_bitmap_length_in_bits = merkle_num_slots * 2;
size_t const merkle_bitmap_length_in_bytes = merkle_bitmap_length_in_bits / 8;
BOOST_STATIC_ASSERT(sizeof(char) == 1);
BOOST_STATIC_ASSERT(CHAR_BIT == 8);
BOOST_STATIC_ASSERT(merkle_num_tree_levels > 0);
BOOST_STATIC_ASSERT(merkle_num_tree_levels < 256);
BOOST_STATIC_ASSERT(merkle_fanout_bits > 0);
BOOST_STATIC_ASSERT(merkle_fanout_bits < 32);
BOOST_STATIC_ASSERT(merkle_hash_length_in_bits > 0);
BOOST_STATIC_ASSERT((merkle_hash_length_in_bits % merkle_fanout_bits) == 0);
BOOST_STATIC_ASSERT(merkle_bitmap_length_in_bits > 0);
BOOST_STATIC_ASSERT((merkle_bitmap_length_in_bits % 8) == 0);
u8 const netcmd_current_protocol_version = 4;
size_t const netcmd_minsz = (1 // version
+ 1 // cmd code
+ 1 // smallest uleb possible
+ 4); // adler32
size_t const netcmd_payload_limit = 0xffffff;
size_t const netcmd_maxsz = netcmd_minsz + netcmd_payload_limit;
size_t const netcmd_minimum_bytes_to_bother_with_gzip = 0xfff;
size_t const netsync_default_port = 5253;
size_t const netsync_connection_limit = 1024;
size_t const netsync_timeout_seconds = 21600; // 6 hours
}
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