/*
+ * hbytes - hex-stringrep efficient byteblocks for Tcl
+ * Copyright 2006 Ian Jackson
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
*/
-#include <string.h>
-#include "hbytes.h"
+#include "chiark_tcl_hbytes.h"
-static int strs(Tcl_Interp *ip, int strc, Tcl_Obj *const *strv, int *l_r) {
- int rc, l, i;
+static int strs1(Tcl_Interp *ip, int strc, Tcl_Obj *const *strv, int *l_r) {
+ int rc, l, i, pl;
l= 0;
for (i=1; i<strc; i++) {
- rc= Tcl_ConvertToType(ip,strv[i],&hbytes_type);
+ rc= Tcl_ConvertToType(ip,strv[i],&cht_hbytes_type);
if (rc) return rc;
- l += HBYTES_LEN(HBYTES(strv[i]));
-fprintf(stderr,"strs #%d %d %02x\n",i,l,
- HBYTES(strv[i]).start ? HBYTES(strv[i]).start[0] : 0xff);
+ pl= cht_hb_len(OBJ_HBYTES(strv[i]));
+ assert(l < INT_MAX/2 && pl < INT_MAX/2);
+ l += pl;
}
*l_r= l;
return TCL_OK;
}
-int app_pre(ClientData cd, Tcl_Interp *ip, int begin,
- HBytes_Var v, int strc, Tcl_Obj *const *strv) {
- int ol, rc, al, i, tl;
-
- rc= strs(ip,strc,strv,&al); if (rc) return rc;
-
- ol= HBYTES_LEN(*v.hb);
- v.hb->start= v.hb->end= Tcl_Realloc(v.hb->start, ol + al);
-
- if (begin) v.hb->end += ol;
- else memmove(v.hb->start + al, v.hb->start, ol);
+static void strs2(Byte *dest, int strc, Tcl_Obj *const *strv) {
+ int tl, i;
for (i=1; i<strc; i++) {
- tl= HBYTES_LEN(HBYTES(strv[i]));
- memcpy(v.hb->end, HBYTES(strv[i]).start, tl);
- v.hb->end += tl;
+ tl= cht_hb_len(OBJ_HBYTES(strv[i]));
+ memcpy(dest, cht_hb_data(OBJ_HBYTES(strv[i])), tl);
+ dest += tl;
}
- return TCL_OK;
-}
+}
-int do_hbytes_append(ClientData cd, Tcl_Interp *ip,
- HBytes_Var v, int strc, Tcl_Obj *const *strv) {
- return app_pre(cd,ip,0,v,strc,strv);
+int cht_do_hbytes_prepend(ClientData cd, Tcl_Interp *ip,
+ HBytes_Var v, int strc, Tcl_Obj *const *strv) {
+ int rc, el;
+ Byte *dest;
+
+ rc= strs1(ip,strc,strv,&el); if (rc) return rc;
+ dest= cht_hb_prepend(v.hb, el);
+ strs2(dest, strc,strv);
+ return TCL_OK;
}
-int do_hbytes_prepend(ClientData cd, Tcl_Interp *ip,
- HBytes_Var v, int strc, Tcl_Obj *const *strv) {
- return app_pre(cd,ip,1,v,strc,strv);
+int cht_do_hbytes_append(ClientData cd, Tcl_Interp *ip,
+ HBytes_Var v, int strc, Tcl_Obj *const *strv) {
+ int rc, el;
+ Byte *dest;
+
+ rc= strs1(ip,strc,strv,&el); if (rc) return rc;
+ dest= cht_hb_append(v.hb, el);
+ strs2(dest, strc,strv);
+ return TCL_OK;
}
-int do_hbytes_concat(ClientData cd, Tcl_Interp *ip,
+int cht_do_hbytes_concat(ClientData cd, Tcl_Interp *ip,
int strc, Tcl_Obj *const *strv, HBytes_Value *result) {
- HBytes_Var fake;
+ int rc, l;
+ Byte *dest;
- result->start= result->end= 0;
- fake.hb= result;
- return app_pre(cd,ip,1,fake,strc,strv);
+ rc= strs1(ip,strc,strv,&l); if (rc) return rc;
+ dest= cht_hb_arrayspace(result,l);
+ strs2(dest, strc,strv);
+ return TCL_OK;
+}
+
+static int underrun(Tcl_Interp *ip) {
+ return cht_staticerr(ip,"data underrun","HBYTES LENGTH UNDERRUN");
}
+int cht_do_hbytes_unprepend(ClientData cd, Tcl_Interp *ip,
+ HBytes_Var v, int preflength, HBytes_Value *result) {
+ const Byte *rdata= cht_hb_unprepend(v.hb, preflength);
+ if (!rdata) return underrun(ip);
+ cht_hb_array(result, rdata, preflength);
+ return TCL_OK;
+}
+
+int cht_do_hbytes_unappend(ClientData cd, Tcl_Interp *ip,
+ HBytes_Var v, int suflength, HBytes_Value *result) {
+ const Byte *rdata= cht_hb_unappend(v.hb, suflength);
+ if (!rdata) return underrun(ip);
+ cht_hb_array(result, rdata, suflength);
+ return TCL_OK;
+}
+
+int cht_do_hbytes_chopto(ClientData cd, Tcl_Interp *ip,
+ HBytes_Var v, int newlength, HBytes_Value *result) {
+ int suflength= cht_hb_len(v.hb) - newlength;
+ return cht_do_hbytes_unappend(0,ip,v, suflength, result);
+}