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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
#include <stdio.h>
#include <curl/curl.h>
/*
* Use this tool to generate an updated table for the Curl_getn_scheme_handler
* function in url.c.
*/
struct detail {
const char *n;
const char *ifdef;
};
static const struct detail scheme[] = {
{"dict", "#ifndef CURL_DISABLE_DICT" },
{"file", "#ifndef CURL_DISABLE_FILE" },
{"ftp", "#ifndef CURL_DISABLE_FTP" },
{"ftps", "#if defined(USE_SSL) && !defined(CURL_DISABLE_FTP)" },
{"gopher", "#ifndef CURL_DISABLE_GOPHER" },
{"gophers", "#if defined(USE_SSL) && !defined(CURL_DISABLE_GOPHER)" },
{"http", "#ifndef CURL_DISABLE_HTTP" },
{"https", "#if defined(USE_SSL) && !defined(CURL_DISABLE_HTTP)" },
{"imap", "#ifndef CURL_DISABLE_IMAP" },
{"imaps", "#if defined(USE_SSL) && !defined(CURL_DISABLE_IMAP)" },
{"ldap", "#ifndef CURL_DISABLE_LDAP" },
{"ldaps", "#if !defined(CURL_DISABLE_LDAP) && \\\n"
" !defined(CURL_DISABLE_LDAPS) && \\\n"
" ((defined(USE_OPENLDAP) && defined(USE_SSL)) || \\\n"
" (!defined(USE_OPENLDAP) && defined(HAVE_LDAP_SSL)))" },
{"mqtt", "#ifndef CURL_DISABLE_MQTT" },
{"pop3", "#ifndef CURL_DISABLE_POP3" },
{"pop3s", "#if defined(USE_SSL) && !defined(CURL_DISABLE_POP3)" },
{"rtmp", "#ifdef USE_LIBRTMP" },
{"rtmpt", "#ifdef USE_LIBRTMP" },
{"rtmpe", "#ifdef USE_LIBRTMP" },
{"rtmpte", "#ifdef USE_LIBRTMP" },
{"rtmps", "#ifdef USE_LIBRTMP" },
{"rtmpts", "#ifdef USE_LIBRTMP" },
{"rtsp", "#ifndef CURL_DISABLE_RTSP" },
{"scp", "#if defined(USE_SSH) && !defined(USE_WOLFSSH)" },
{"sftp", "#if defined(USE_SSH)" },
{"smb", "#if !defined(CURL_DISABLE_SMB) && \\\n"
" defined(USE_CURL_NTLM_CORE) && (SIZEOF_CURL_OFF_T > 4)" },
{"smbs", "#if defined(USE_SSL) && !defined(CURL_DISABLE_SMB) && \\\n"
" defined(USE_CURL_NTLM_CORE) && (SIZEOF_CURL_OFF_T > 4)" },
{"smtp", "#ifndef CURL_DISABLE_SMTP" },
{"smtps", "#if defined(USE_SSL) && !defined(CURL_DISABLE_SMTP)" },
{"telnet", "#ifndef CURL_DISABLE_TELNET" },
{"tftp", "#ifndef CURL_DISABLE_TFTP" },
{"ws",
"#if !defined(CURL_DISABLE_WEBSOCKETS) && !defined(CURL_DISABLE_HTTP)" },
{"wss", "#if !defined(CURL_DISABLE_WEBSOCKETS) && \\\n"
" defined(USE_SSL) && !defined(CURL_DISABLE_HTTP)" },
{ NULL, NULL }
};
unsigned int calc(const char *s, int add, int shift)
{
const char *so = s;
unsigned int c = add;
while(*s) {
c <<= shift;
c += *s;
s++;
}
return c;
}
unsigned int num[100];
unsigned int ix[100];
static void showtable(int try, int init, int shift)
{
int nulls = 0;
int i;
for(i = 0; scheme[i].n; ++i)
num[i] = calc(scheme[i].n, init, shift);
for(i = 0; scheme[i].n; ++i)
ix[i] = num[i] % try;
printf("/*\n"
" unsigned int c = %d\n"
" while(l) {\n"
" c <<= %d;\n"
" c += Curl_raw_tolower(*s);\n"
" s++;\n"
" l--;\n"
" }\n"
"*/\n", init, shift);
printf(" static const struct Curl_handler * const protocols[%d] = {", try);
/* generate table */
for(i = 0; i < try; i++) {
int match = 0;
int j;
for(j = 0; scheme[j].n; j++) {
if(ix[j] == i) {
printf("\n");
printf("%s\n", scheme[j].ifdef);
printf(" &Curl_handler_%s,\n", scheme[j].n);
printf("#else\n NULL,\n");
printf("#endif");
match = 1;
nulls = 0;
break;
}
}
if(!match) {
if(!nulls || (nulls > 10)) {
printf("\n ");
nulls = 0;
}
printf(" NULL,", nulls);
nulls++;
}
}
printf("\n };\n");
}
int main(void)
{
int i;
int try;
int besttry = 9999;
int bestadd = 0;
int bestshift = 0;
int add;
int shift;
for(shift = 0; shift < 8; shift++) {
for(add = 0; add < 999; add++) {
for(i = 0; scheme[i].n; ++i) {
unsigned int v = calc(scheme[i].n, add, shift);
int j;
int badcombo = 0;
for(j = 0; j < i; j++) {
if(num[j] == v) {
/*
printf("NOPE: %u is a dupe (%s and %s)\n",
v, scheme[i], scheme[j]);
*/
badcombo = 1;
break;
}
}
if(badcombo)
break;
num[i] = v;
}
#if 0
for(i = 0; scheme[i].n; ++i) {
printf("%u - %s\n", num[i], scheme[i].n);
}
#endif
/* try different remainders to find smallest possible table */
for(try = 28; try < 199; try++) {
int good = 1;
for(i = 0; scheme[i].n; ++i) {
ix[i] = num[i] % try;
}
/* check for dupes */
for(i = 0; scheme[i].n && good; ++i) {
int j;
for(j = 0; j < i; j++) {
if(ix[j] == ix[i]) {
good = 0;
break;
}
}
}
if(good) {
if(try < besttry) {
besttry = try;
bestadd = add;
bestshift = shift;
}
break;
}
}
}
}
showtable(besttry, bestadd, bestshift);
}
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