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Venti: module {
PATH: con "/dis/lib/venti.dis";
Scoresize: con 20;
Maxstringsize: con 1000;
Authsize: con 1024; # size of auth group - in bits - must be multiple of 8
Maxfragsize: con 9*1024;
Cryptostrengthnone,
Cryptostrengthauth,
Cryptostrengthweak,
Cryptostrengthstrong: con iota;
Cryptonone,
CryptoSSL3,
CryptoTLS1,
Cryptomax: con iota;
Codecnone,
Codecdeflate,
CodecThwack,
Codecmax: con iota;
Terror, # not used
Rerror,
Tping,
Rping,
Thello,
Rhello,
Tgoodbye,
Rgoodbye, # not used
Tauth0,
Rauth0,
Tauth1,
Rauth1,
Tread,
Rread,
Twrite,
Rwrite,
Tsync,
Rsync,
Tmax: con iota;
# versions
Version01,
Version02: con iota + 1;
# Lump Types
Errtype, # illegal
Roottype,
Dirtype,
Pointertype0,
Pointertype1,
Pointertype2,
Pointertype3,
Pointertype4,
Pointertype5,
Pointertype6,
Pointertype7, # not used
Pointertype8, # not used
Pointertype9, # not used
Datatype,
Maxtype: con iota;
# Dir Entry flags
Entryactive: con (1<<0); # entry is in use
Entrydir: con (1<<1); # a directory
Entrydepthshift: con 2; # shift for pointer depth
Entrydepthmask: con (16r7<<2); # mask for pointer depth
Entrylocal: con (1<<5); # used for local storage: should not be set for venti blocks
Maxlumpsize: con 56 * 1024;
Pointerdepth: con 7;
Entrysize: con 40;
Rootsize: con 300;
Rootversion: con 2;
Maxfilesize: con (big 1 << 48) - big 1;
Vmsg: adt {
istmsg: int;
tid: int;
pick {
Thello =>
version: string;
uid: string;
cryptostrength: int;
cryptos: array of byte;
codecs: array of byte;
Rhello =>
sid: string;
crypto: int;
codec: int;
Tping =>
Rping =>
Tread =>
score: Score;
etype: int;
n: int;
Rread =>
data: array of byte;
Twrite =>
etype: int;
data: array of byte;
Rwrite =>
score: Score;
Tsync =>
Rsync =>
Tgoodbye =>
Rerror =>
e: string;
}
read: fn(fd: ref Sys->FD): (ref Vmsg, string);
unpack: fn(a: array of byte): (int, ref Vmsg);
pack: fn(nil: self ref Vmsg): array of byte;
packedsize: fn(nil: self ref Vmsg): int;
text: fn(nil: self ref Vmsg): string;
};
Root: adt {
version: int;
name: string;
rtype: string;
score: Venti->Score; # to a Dir block
blocksize: int; # maximum block size
prev: Venti->Score; # last root block
};
Entry: adt {
gen: int; # generation number (XXX should be unsigned)
psize: int; # pointer block size
dsize: int; # data block size
depth: int; # unpacked from flags
flags: int;
size: big; # (XXX should be unsigned)
score: Venti->Score;
};
Score: adt {
a: array of byte;
eq: fn(a: self Score, b: Score): int;
text: fn(a: self Score): string;
parse: fn(s: string): (int, Score);
zero: fn(): Score;
};
Session: adt {
fd: ref Sys->FD;
version: string;
new: fn(fd: ref Sys->FD): ref Session;
read: fn(s: self ref Session, score: Venti->Score, etype: int, maxn: int): array of byte;
write: fn(s: self ref Session, etype: int, buf: array of byte): (int, Venti->Score);
sync: fn(s: self ref Session): int;
rpc: fn(s: self ref Session, m: ref Vmsg): (ref Vmsg, string);
};
unpackentry: fn(d: array of byte): ref Entry;
unpackroot: fn(d: array of byte): ref Root;
init: fn();
};
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