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implement Transport;
include "common.m";
include "transport.m";
# local copies from CU
sys: Sys;
U: Url;
Parsedurl: import U;
CU: CharonUtils;
Netconn, ByteSource, Header, config : import CU;
dbg := 0;
init(c: CharonUtils)
{
CU = c;
sys = load Sys Sys->PATH;
U = load Url Url->PATH;
if (U != nil)
U->init();
dbg = int (CU->config).dbg['n'];
}
connect(nc: ref Netconn, nil: ref ByteSource)
{
nc.connected = 1;
nc.state = CU->NCgethdr;
return;
}
writereq(nil: ref Netconn, nil: ref ByteSource)
{
return;
}
gethdr(nc: ref Netconn, bs: ref ByteSource)
{
u := bs.req.url;
f := u.path;
hdr := Header.new();
nc.conn = ref Dial->Connection;
nc.conn.dfd = sys->open(f, sys->OREAD);
if(nc.conn.dfd == nil) {
if(dbg)
sys->print("file %d: can't open %s: %r\n", nc.id, f);
# Could examine %r to distinguish between NotFound
# and Forbidden and other, but string is OS-dependent.
hdr.code = CU->HCNotFound;
bs.hdr = hdr;
nc.connected = 0;
return;
}
(ok, statbuf) := sys->fstat(nc.conn.dfd);
if(ok < 0) {
bs.err = "stat error";
return;
}
if (statbuf.mode & Sys->DMDIR) {
bs.err = "Directories not implemented";
return;
}
# assuming file (not directory)
n := int statbuf.length;
hdr.length = n;
if(n > sys->ATOMICIO)
n = sys->ATOMICIO;
a := array[n] of byte;
n = sys->read(nc.conn.dfd, a, n);
if(dbg)
sys->print("file %d: initial read %d bytes\n", nc.id, n);
if(n < 0) {
bs.err = "read error";
return;
}
hdr.setmediatype(f, a[0:n]);
hdr.base = hdr.actual = bs.req.url;
if(dbg)
sys->print("file %d: hdr has mediatype=%s, length=%d\n",
nc.id, CU->mnames[hdr.mtype], hdr.length);
bs.hdr = hdr;
if(n == len a)
nc.tbuf = a;
else
nc.tbuf = a[0:n];
}
getdata(nc: ref Netconn, bs: ref ByteSource): int
{
dfd := nc.conn.dfd;
if (dfd == nil)
return -1;
if (bs.data == nil || bs.edata >= len bs.data) {
closeconn(nc);
return 0;
}
buf := bs.data[bs.edata:];
n := len buf;
if (nc.tbuf != nil) {
# initial overread of header
if (n >= len nc.tbuf) {
n = len nc.tbuf;
buf[:] = nc.tbuf;
nc.tbuf = nil;
return n;
}
buf[:] = nc.tbuf[:n];
nc.tbuf = nc.tbuf[n:];
return n;
}
n = sys->read(dfd, buf, n);
if(dbg > 1)
sys->print("ftp %d: read %d bytes\n", nc.id, n);
if(n <= 0) {
bs.err = sys->sprint("%r");
closeconn(nc);
}
return n;
}
defaultport(nil: string) : int
{
return 0;
}
closeconn(nc: ref Netconn)
{
nc.conn = nil;
nc.connected = 0;
}
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