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- #include <u.h>
- #include <libc.h>
- #include <libsec.h>
- #include <bin.h>
- #include <httpd.h>
- #include "escape.h"
- typedef struct Hlex Hlex;
- typedef struct MimeHead MimeHead;
- enum
- {
- /*
- * tokens
- */
- Word = 1,
- QString,
- };
- #define UlongMax 4294967295UL
- struct Hlex
- {
- int tok;
- int eoh;
- int eol; /* end of header line encountered? */
- uchar *hstart; /* start of header */
- jmp_buf jmp; /* jmp here to parse header */
- char wordval[HMaxWord];
- HConnect *c;
- };
- struct MimeHead
- {
- char *name;
- void (*parse)(Hlex*, char*);
- uchar seen;
- uchar ignore;
- };
- static void mimeaccept(Hlex*, char*);
- static void mimeacceptchar(Hlex*, char*);
- static void mimeacceptenc(Hlex*, char*);
- static void mimeacceptlang(Hlex*, char*);
- static void mimeagent(Hlex*, char*);
- static void mimeauthorization(Hlex*, char*);
- static void mimeconnection(Hlex*, char*);
- static void mimecontlen(Hlex*, char*);
- static void mimeexpect(Hlex*, char*);
- static void mimefresh(Hlex*, char*);
- static void mimefrom(Hlex*, char*);
- static void mimehost(Hlex*, char*);
- static void mimeifrange(Hlex*, char*);
- static void mimeignore(Hlex*, char*);
- static void mimematch(Hlex*, char*);
- static void mimemodified(Hlex*, char*);
- static void mimenomatch(Hlex*, char*);
- static void mimerange(Hlex*, char*);
- static void mimetransenc(Hlex*, char*);
- static void mimeunmodified(Hlex*, char*);
- /*
- * headers seen also include
- * allow cache-control chargeto
- * content-encoding content-language content-location content-md5 content-range content-type
- * date etag expires forwarded last-modified max-forwards pragma
- * proxy-agent proxy-authorization proxy-connection
- * ua-color ua-cpu ua-os ua-pixels
- * upgrade via x-afs-tokens x-serial-number
- */
- static MimeHead mimehead[] =
- {
- {"accept", mimeaccept},
- {"accept-charset", mimeacceptchar},
- {"accept-encoding", mimeacceptenc},
- {"accept-language", mimeacceptlang},
- {"authorization", mimeauthorization},
- {"connection", mimeconnection},
- {"content-length", mimecontlen},
- {"expect", mimeexpect},
- {"fresh", mimefresh},
- {"from", mimefrom},
- {"host", mimehost},
- {"if-match", mimematch},
- {"if-modified-since", mimemodified},
- {"if-none-match", mimenomatch},
- {"if-range", mimeifrange},
- {"if-unmodified-since", mimeunmodified},
- {"range", mimerange},
- {"transfer-encoding", mimetransenc},
- {"user-agent", mimeagent},
- };
- char* hmydomain;
- char* hversion = "HTTP/1.1";
- static void lexhead(Hlex*);
- static void parsejump(Hlex*, char*);
- static int getc(Hlex*);
- static void ungetc(Hlex*);
- static int wordcr(Hlex*);
- static int wordnl(Hlex*);
- static void word(Hlex*, char*);
- static int lex1(Hlex*, int);
- static int lex(Hlex*);
- static int lexbase64(Hlex*);
- static ulong digtoul(char *s, char **e);
- /*
- * flush an clean up junk from a request
- */
- void
- hreqcleanup(HConnect *c)
- {
- int i;
- hxferenc(&c->hout, 0);
- memset(&c->req, 0, sizeof(c->req));
- memset(&c->head, 0, sizeof(c->head));
- c->hpos = c->header;
- c->hstop = c->header;
- binfree(&c->bin);
- for(i = 0; i < nelem(mimehead); i++){
- mimehead[i].seen = 0;
- mimehead[i].ignore = 0;
- }
- }
- /*
- * list of tokens
- * if the client is HTTP/1.0,
- * ignore headers which match one of the tokens.
- * restarts parsing if necessary.
- */
- static void
- mimeconnection(Hlex *h, char *)
- {
- char *u, *p;
- int reparse, i;
- reparse = 0;
- for(;;){
- while(lex(h) != Word)
- if(h->tok != ',')
- goto breakout;
- if(cistrcmp(h->wordval, "keep-alive") == 0)
- h->c->head.persist = 1;
- else if(cistrcmp(h->wordval, "close") == 0)
- h->c->head.closeit = 1;
- else if(!http11(h->c)){
- for(i = 0; i < nelem(mimehead); i++){
- if(cistrcmp(mimehead[i].name, h->wordval) == 0){
- reparse = mimehead[i].seen && !mimehead[i].ignore;
- mimehead[i].ignore = 1;
- if(cistrcmp(mimehead[i].name, "authorization") == 0){
- h->c->head.authuser = nil;
- h->c->head.authpass = nil;
- }
- }
- }
- }
- if(lex(h) != ',')
- break;
- }
- breakout:;
- /*
- * if need to ignore headers we've already parsed,
- * reset & start over. need to save authorization
- * info because it's written over when parsed.
- */
- if(reparse){
- u = h->c->head.authuser;
- p = h->c->head.authpass;
- memset(&h->c->head, 0, sizeof(h->c->head));
- h->c->head.authuser = u;
- h->c->head.authpass = p;
- h->c->hpos = h->hstart;
- longjmp(h->jmp, 1);
- }
- }
- int
- hparseheaders(HConnect *c, int timeout)
- {
- Hlex h;
- c->head.fresh_thresh = 0;
- c->head.fresh_have = 0;
- c->head.persist = 0;
- if(c->req.vermaj == 0){
- c->head.host = hmydomain;
- return 1;
- }
- memset(&h, 0, sizeof(h));
- h.c = c;
- alarm(timeout);
- if(!hgethead(c, 1))
- return -1;
- alarm(0);
- h.hstart = c->hpos;
- if(setjmp(h.jmp) == -1)
- return -1;
- h.eol = 0;
- h.eoh = 0;
- h.tok = '\n';
- while(lex(&h) != '\n'){
- if(h.tok == Word && lex(&h) == ':')
- parsejump(&h, hstrdup(c, h.wordval));
- while(h.tok != '\n')
- lex(&h);
- h.eol = h.eoh;
- }
- if(http11(c)){
- /*
- * according to the http/1.1 spec,
- * these rules must be followed
- */
- if(c->head.host == nil){
- hfail(c, HBadReq, nil);
- return -1;
- }
- if(c->req.urihost != nil)
- c->head.host = c->req.urihost;
- /*
- * also need to check host is actually this one
- */
- }else if(c->head.host == nil)
- c->head.host = hmydomain;
- return 1;
- }
- /*
- * mimeparams : | mimeparams ";" mimepara
- * mimeparam : token "=" token | token "=" qstring
- */
- static HSPairs*
- mimeparams(Hlex *h)
- {
- HSPairs *p;
- char *s;
- p = nil;
- for(;;){
- if(lex(h) != Word)
- break;
- s = hstrdup(h->c, h->wordval);
- if(lex(h) != Word && h->tok != QString)
- break;
- p = hmkspairs(h->c, s, hstrdup(h->c, h->wordval), p);
- }
- return hrevspairs(p);
- }
- /*
- * mimehfields : mimehfield | mimehfields commas mimehfield
- * mimehfield : token mimeparams
- * commas : "," | commas ","
- */
- static HFields*
- mimehfields(Hlex *h)
- {
- HFields *f;
- f = nil;
- for(;;){
- while(lex(h) != Word)
- if(h->tok != ',')
- goto breakout;
- f = hmkhfields(h->c, hstrdup(h->c, h->wordval), nil, f);
- if(lex(h) == ';')
- f->params = mimeparams(h);
- if(h->tok != ',')
- break;
- }
- breakout:;
- return hrevhfields(f);
- }
- /*
- * parse a list of acceptable types, encodings, languages, etc.
- */
- static HContent*
- mimeok(Hlex *h, char *name, int multipart, HContent *head)
- {
- char *generic, *specific, *s;
- float v;
- /*
- * each type is separated by one or more commas
- */
- while(lex(h) != Word)
- if(h->tok != ',')
- return head;
- generic = hstrdup(h->c, h->wordval);
- lex(h);
- if(h->tok == '/' || multipart){
- /*
- * at one time, IE5 improperly said '*' for single types
- */
- if(h->tok != '/')
- return nil;
- if(lex(h) != Word)
- return head;
- specific = hstrdup(h->c, h->wordval);
- if(!multipart && strcmp(specific, "*") != 0)
- return head;
- lex(h);
- }else
- specific = nil;
- head = hmkcontent(h->c, generic, specific, head);
- for(;;){
- switch(h->tok){
- case ';':
- /*
- * should make a list of these params
- * for accept, they fall into two classes:
- * up to a q=..., they modify the media type.
- * afterwards, they acceptance criteria
- */
- if(lex(h) == Word){
- s = hstrdup(h->c, h->wordval);
- if(lex(h) != '=' || lex(h) != Word && h->tok != QString)
- return head;
- v = strtod(h->wordval, nil);
- if(strcmp(s, "q") == 0)
- head->q = v;
- else if(strcmp(s, "mxb") == 0)
- head->mxb = v;
- }
- break;
- case ',':
- return mimeok(h, name, multipart, head);
- default:
- return head;
- }
- lex(h);
- }
- return head;
- }
- /*
- * parse a list of entity tags
- * 1#entity-tag
- * entity-tag = [weak] opaque-tag
- * weak = "W/"
- * opaque-tag = quoted-string
- */
- static HETag*
- mimeetag(Hlex *h, HETag *head)
- {
- HETag *e;
- int weak;
- for(;;){
- while(lex(h) != Word && h->tok != QString)
- if(h->tok != ',')
- return head;
- weak = 0;
- if(h->tok == Word && strcmp(h->wordval, "*") != 0){
- if(strcmp(h->wordval, "W") != 0)
- return head;
- if(lex(h) != '/' || lex(h) != QString)
- return head;
- weak = 1;
- }
- e = halloc(h->c, sizeof(HETag));
- e->etag = hstrdup(h->c, h->wordval);
- e->weak = weak;
- e->next = head;
- head = e;
- if(lex(h) != ',')
- return head;
- }
- return head;
- }
- /*
- * ranges-specifier = byte-ranges-specifier
- * byte-ranges-specifier = "bytes" "=" byte-range-set
- * byte-range-set = 1#(byte-range-spec|suffix-byte-range-spec)
- * byte-range-spec = byte-pos "-" [byte-pos]
- * byte-pos = 1*DIGIT
- * suffix-byte-range-spec = "-" suffix-length
- * suffix-length = 1*DIGIT
- *
- * syntactically invalid range specifiers cause the
- * entire header field to be ignored.
- * it is syntactically incorrect for the second byte pos
- * to be smaller than the first byte pos
- */
- static HRange*
- mimeranges(Hlex *h, HRange *head)
- {
- HRange *r, *rh, *tail;
- char *w;
- ulong start, stop;
- int suf;
- if(lex(h) != Word || strcmp(h->wordval, "bytes") != 0 || lex(h) != '=')
- return head;
- rh = nil;
- tail = nil;
- for(;;){
- while(lex(h) != Word){
- if(h->tok != ','){
- if(h->tok == '\n')
- goto breakout;
- return head;
- }
- }
- w = h->wordval;
- start = 0;
- suf = 1;
- if(w[0] != '-'){
- suf = 0;
- start = digtoul(w, &w);
- if(w[0] != '-')
- return head;
- }
- w++;
- stop = ~0UL;
- if(w[0] != '\0'){
- stop = digtoul(w, &w);
- if(w[0] != '\0')
- return head;
- if(!suf && stop < start)
- return head;
- }
- r = halloc(h->c, sizeof(HRange));
- r->suffix = suf;
- r->start = start;
- r->stop = stop;
- r->next = nil;
- if(rh == nil)
- rh = r;
- else
- tail->next = r;
- tail = r;
- if(lex(h) != ','){
- if(h->tok == '\n')
- break;
- return head;
- }
- }
- breakout:;
- if(head == nil)
- return rh;
- for(tail = head; tail->next != nil; tail = tail->next)
- ;
- tail->next = rh;
- return head;
- }
- static void
- mimeaccept(Hlex *h, char *name)
- {
- h->c->head.oktype = mimeok(h, name, 1, h->c->head.oktype);
- }
- static void
- mimeacceptchar(Hlex *h, char *name)
- {
- h->c->head.okchar = mimeok(h, name, 0, h->c->head.okchar);
- }
- static void
- mimeacceptenc(Hlex *h, char *name)
- {
- h->c->head.okencode = mimeok(h, name, 0, h->c->head.okencode);
- }
- static void
- mimeacceptlang(Hlex *h, char *name)
- {
- h->c->head.oklang = mimeok(h, name, 0, h->c->head.oklang);
- }
- static void
- mimemodified(Hlex *h, char *)
- {
- lexhead(h);
- h->c->head.ifmodsince = hdate2sec(h->wordval);
- }
- static void
- mimeunmodified(Hlex *h, char *)
- {
- lexhead(h);
- h->c->head.ifunmodsince = hdate2sec(h->wordval);
- }
- static void
- mimematch(Hlex *h, char *)
- {
- h->c->head.ifmatch = mimeetag(h, h->c->head.ifmatch);
- }
- static void
- mimenomatch(Hlex *h, char *)
- {
- h->c->head.ifnomatch = mimeetag(h, h->c->head.ifnomatch);
- }
- /*
- * argument is either etag or date
- */
- static void
- mimeifrange(Hlex *h, char *)
- {
- int c, d, et;
- et = 0;
- c = getc(h);
- while(c == ' ' || c == '\t')
- c = getc(h);
- if(c == '"')
- et = 1;
- else if(c == 'W'){
- d = getc(h);
- if(d == '/')
- et = 1;
- ungetc(h);
- }
- ungetc(h);
- if(et){
- h->c->head.ifrangeetag = mimeetag(h, h->c->head.ifrangeetag);
- }else{
- lexhead(h);
- h->c->head.ifrangedate = hdate2sec(h->wordval);
- }
- }
- static void
- mimerange(Hlex *h, char *)
- {
- h->c->head.range = mimeranges(h, h->c->head.range);
- }
- /*
- * note: netscape and ie through versions 4.7 and 4
- * support only basic authorization, so that is all that is supported here
- *
- * "Authorization" ":" "Basic" base64-user-pass
- * where base64-user-pass is the base64 encoding of
- * username ":" password
- */
- static void
- mimeauthorization(Hlex *h, char *)
- {
- char *up, *p;
- int n;
- if(lex(h) != Word || cistrcmp(h->wordval, "basic") != 0)
- return;
- n = lexbase64(h);
- if(!n)
- return;
- /*
- * wipe out source for password, so it won't be logged.
- * it is replaced by a single =,
- * which is valid base64, but not ok for an auth reponse.
- * therefore future parses of the header field will not overwrite
- * authuser and authpass.
- */
- memmove(h->c->hpos - (n - 1), h->c->hpos, h->c->hstop - h->c->hpos);
- h->c->hstop -= n - 1;
- *h->c->hstop = '\0';
- h->c->hpos -= n - 1;
- h->c->hpos[-1] = '=';
- up = halloc(h->c, n + 1);
- n = dec64((uchar*)up, n, h->wordval, n);
- up[n] = '\0';
- p = strchr(up, ':');
- if(p != nil){
- *p++ = '\0';
- h->c->head.authuser = hstrdup(h->c, up);
- h->c->head.authpass = hstrdup(h->c, p);
- }
- }
- static void
- mimeagent(Hlex *h, char *)
- {
- lexhead(h);
- h->c->head.client = hstrdup(h->c, h->wordval);
- }
- static void
- mimefrom(Hlex *h, char *)
- {
- lexhead(h);
- }
- static void
- mimehost(Hlex *h, char *)
- {
- char *hd;
- lexhead(h);
- for(hd = h->wordval; *hd == ' ' || *hd == '\t'; hd++)
- ;
- h->c->head.host = hlower(hstrdup(h->c, hd));
- }
- /*
- * if present, implies that a message body follows the headers
- * "content-length" ":" digits
- */
- static void
- mimecontlen(Hlex *h, char *)
- {
- char *e;
- ulong v;
- if(lex(h) != Word)
- return;
- e = h->wordval;
- v = digtoul(e, &e);
- if(v == ~0UL || *e != '\0')
- return;
- h->c->head.contlen = v;
- }
- /*
- * mimexpect : "expect" ":" expects
- * expects : | expects "," expect
- * expect : "100-continue" | token | token "=" token expectparams | token "=" qstring expectparams
- * expectparams : ";" token | ";" token "=" token | token "=" qstring
- * for now, we merely parse "100-continue" or anything else.
- */
- static void
- mimeexpect(Hlex *h, char *)
- {
- if(lex(h) != Word || cistrcmp(h->wordval, "100-continue") != 0 || lex(h) != '\n')
- h->c->head.expectother = 1;
- h->c->head.expectcont = 1;
- }
- static void
- mimetransenc(Hlex *h, char *)
- {
- h->c->head.transenc = mimehfields(h);
- }
- static void
- mimefresh(Hlex *h, char *)
- {
- char *s;
- lexhead(h);
- for(s = h->wordval; *s && (*s==' ' || *s=='\t'); s++)
- ;
- if(strncmp(s, "pathstat/", 9) == 0)
- h->c->head.fresh_thresh = atoi(s+9);
- else if(strncmp(s, "have/", 5) == 0)
- h->c->head.fresh_have = atoi(s+5);
- }
- static void
- mimeignore(Hlex *h, char *)
- {
- lexhead(h);
- }
- static void
- parsejump(Hlex *h, char *k)
- {
- int l, r, m;
- l = 1;
- r = nelem(mimehead) - 1;
- while(l <= r){
- m = (r + l) >> 1;
- if(cistrcmp(mimehead[m].name, k) <= 0)
- l = m + 1;
- else
- r = m - 1;
- }
- m = l - 1;
- if(cistrcmp(mimehead[m].name, k) == 0 && !mimehead[m].ignore){
- mimehead[m].seen = 1;
- (*mimehead[m].parse)(h, k);
- }else
- mimeignore(h, k);
- }
- static int
- lex(Hlex *h)
- {
- return h->tok = lex1(h, 0);
- }
- static int
- lexbase64(Hlex *h)
- {
- int c, n;
- n = 0;
- lex1(h, 1);
- while((c = getc(h)) >= 0){
- if(!(c >= 'A' && c <= 'Z'
- || c >= 'a' && c <= 'z'
- || c >= '0' && c <= '9'
- || c == '+' || c == '/')){
- ungetc(h);
- break;
- }
- if(n < HMaxWord-1)
- h->wordval[n++] = c;
- }
- h->wordval[n] = '\0';
- return n;
- }
- /*
- * rfc 822/rfc 1521 lexical analyzer
- */
- static int
- lex1(Hlex *h, int skipwhite)
- {
- int level, c;
- if(h->eol)
- return '\n';
- top:
- c = getc(h);
- switch(c){
- case '(':
- level = 1;
- while((c = getc(h)) >= 0){
- if(c == '\\'){
- c = getc(h);
- if(c < 0)
- return '\n';
- continue;
- }
- if(c == '(')
- level++;
- else if(c == ')' && --level == 0)
- break;
- else if(c == '\n'){
- c = getc(h);
- if(c < 0)
- return '\n';
- if(c == ')' && --level == 0)
- break;
- if(c != ' ' && c != '\t'){
- ungetc(h);
- return '\n';
- }
- }
- }
- goto top;
- case ' ': case '\t':
- goto top;
- case '\r':
- c = getc(h);
- if(c != '\n'){
- ungetc(h);
- goto top;
- }
- case '\n':
- if(h->tok == '\n'){
- h->eol = 1;
- h->eoh = 1;
- return '\n';
- }
- c = getc(h);
- if(c < 0){
- h->eol = 1;
- return '\n';
- }
- if(c != ' ' && c != '\t'){
- ungetc(h);
- h->eol = 1;
- return '\n';
- }
- goto top;
- case ')':
- case '<': case '>':
- case '[': case ']':
- case '@': case '/':
- case ',': case ';': case ':': case '?': case '=':
- if(skipwhite){
- ungetc(h);
- return c;
- }
- return c;
- case '"':
- if(skipwhite){
- ungetc(h);
- return c;
- }
- word(h, "\"");
- getc(h); /* skip the closing quote */
- return QString;
- default:
- ungetc(h);
- if(skipwhite)
- return c;
- word(h, "\"(){}<>@,;:/[]?=\r\n \t");
- if(h->wordval[0] == '\0'){
- h->c->head.closeit = 1;
- hfail(h->c, HSyntax);
- longjmp(h->jmp, -1);
- }
- return Word;
- }
- goto top;
- return 0;
- }
- /*
- * return the rest of an rfc 822, including \n
- * do not map to lower case
- */
- static void
- lexhead(Hlex *h)
- {
- int c, n;
- n = 0;
- while((c = getc(h)) >= 0){
- if(c == '\r')
- c = wordcr(h);
- else if(c == '\n')
- c = wordnl(h);
- if(c == '\n')
- break;
- if(c == '\\'){
- c = getc(h);
- if(c < 0)
- break;
- }
- if(n < HMaxWord-1)
- h->wordval[n++] = c;
- }
- h->tok = '\n';
- h->eol = 1;
- h->wordval[n] = '\0';
- }
- static void
- word(Hlex *h, char *stop)
- {
- int c, n;
- n = 0;
- while((c = getc(h)) >= 0){
- if(c == '\r')
- c = wordcr(h);
- else if(c == '\n')
- c = wordnl(h);
- if(c == '\\'){
- c = getc(h);
- if(c < 0)
- break;
- }else if(c < 32 || strchr(stop, c) != nil){
- ungetc(h);
- break;
- }
- if(n < HMaxWord-1)
- h->wordval[n++] = c;
- }
- h->wordval[n] = '\0';
- }
- static int
- wordcr(Hlex *h)
- {
- int c;
- c = getc(h);
- if(c == '\n')
- return wordnl(h);
- ungetc(h);
- return ' ';
- }
- static int
- wordnl(Hlex *h)
- {
- int c;
- c = getc(h);
- if(c == ' ' || c == '\t')
- return c;
- ungetc(h);
- return '\n';
- }
- static int
- getc(Hlex *h)
- {
- if(h->eoh)
- return -1;
- if(h->c->hpos < h->c->hstop)
- return *h->c->hpos++;
- h->eoh = 1;
- h->eol = 1;
- return -1;
- }
- static void
- ungetc(Hlex *h)
- {
- if(h->eoh)
- return;
- h->c->hpos--;
- }
- static ulong
- digtoul(char *s, char **e)
- {
- ulong v;
- int c, ovfl;
- v = 0;
- ovfl = 0;
- for(;;){
- c = *s;
- if(c < '0' || c > '9')
- break;
- s++;
- c -= '0';
- if(v > UlongMax/10 || v == UlongMax/10 && c >= UlongMax%10)
- ovfl = 1;
- v = v * 10 + c;
- }
- if(e)
- *e = s;
- if(ovfl)
- return UlongMax;
- return v;
- }
- int
- http11(HConnect *c)
- {
- return c->req.vermaj > 1 || c->req.vermaj == 1 && c->req.vermin > 0;
- }
- char*
- hmkmimeboundary(HConnect *c)
- {
- char buf[32];
- int i;
- srand((time(0)<<16)|getpid());
- strcpy(buf, "upas-");
- for(i = 5; i < sizeof(buf)-1; i++)
- buf[i] = 'a' + nrand(26);
- buf[i] = 0;
- return hstrdup(c, buf);
- }
- HSPairs*
- hmkspairs(HConnect *c, char *s, char *t, HSPairs *next)
- {
- HSPairs *sp;
- sp = halloc(c, sizeof *sp);
- sp->s = s;
- sp->t = t;
- sp->next = next;
- return sp;
- }
- HSPairs*
- hrevspairs(HSPairs *sp)
- {
- HSPairs *last, *next;
- last = nil;
- for(; sp != nil; sp = next){
- next = sp->next;
- sp->next = last;
- last = sp;
- }
- return last;
- }
- HFields*
- hmkhfields(HConnect *c, char *s, HSPairs *p, HFields *next)
- {
- HFields *hf;
- hf = halloc(c, sizeof *hf);
- hf->s = s;
- hf->params = p;
- hf->next = next;
- return hf;
- }
- HFields*
- hrevhfields(HFields *hf)
- {
- HFields *last, *next;
- last = nil;
- for(; hf != nil; hf = next){
- next = hf->next;
- hf->next = last;
- last = hf;
- }
- return last;
- }
- HContent*
- hmkcontent(HConnect *c, char *generic, char *specific, HContent *next)
- {
- HContent *ct;
- ct = halloc(c, sizeof(HContent));
- ct->generic = generic;
- ct->specific = specific;
- ct->next = next;
- ct->q = 1;
- ct->mxb = 0;
- return ct;
- }
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