rfc1738.c
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上传日期:2007-01-04
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- /*
- * $Id: rfc1738.c,v 1.18 1998/08/12 16:08:05 wessels Exp $
- *
- * DEBUG:
- * AUTHOR: Harvest Derived
- *
- * SQUID Internet Object Cache http://squid.nlanr.net/Squid/
- * ----------------------------------------------------------
- *
- * Squid is the result of efforts by numerous individuals from the
- * Internet community. Development is led by Duane Wessels of the
- * National Laboratory for Applied Network Research and funded by the
- * National Science Foundation. Squid is Copyrighted (C) 1998 by
- * Duane Wessels and the University of California San Diego. Please
- * see the COPYRIGHT file for full details. Squid incorporates
- * software developed and/or copyrighted by other sources. Please see
- * the CREDITS file for full details.
- *
- * 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 program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
- *
- */
- #include "config.h"
- #if HAVE_STDIO_H
- #include <stdio.h>
- #endif
- #if HAVE_STRING_H
- #include <string.h>
- #endif
- #include "util.h"
- #include "snprintf.h"
- /*
- * RFC 1738 defines that these characters should be escaped, as well
- * any non-US-ASCII character or anything between 0x00 - 0x1F.
- */
- static char rfc1738_unsafe_chars[] =
- {
- (char) 0x3C, /* < */
- (char) 0x3E, /* > */
- (char) 0x22, /* " */
- (char) 0x23, /* # */
- (char) 0x25, /* % */
- (char) 0x7B, /* { */
- (char) 0x7D, /* } */
- (char) 0x7C, /* | */
- (char) 0x5C, /* */
- (char) 0x5E, /* ^ */
- (char) 0x7E, /* ~ */
- (char) 0x5B, /* [ */
- (char) 0x5D, /* ] */
- (char) 0x60, /* ` */
- (char) 0x27, /* ' */
- (char) 0x20 /* space */
- };
- /*
- * rfc1738_escape - Returns a static buffer contains the RFC 1738
- * compliant, escaped version of the given url.
- */
- char *
- rfc1738_escape(const char *url)
- {
- static char *buf;
- static size_t bufsize = 0;
- const char *p;
- char *q;
- int i, do_escape;
- if (buf == NULL || strlen(url) * 3 > bufsize) {
- xfree(buf);
- bufsize = strlen(url) * 3 + 1;
- buf = xcalloc(bufsize, 1);
- }
- for (p = url, q = buf; *p != ' '; p++, q++) {
- do_escape = 0;
- /* RFC 1738 defines these chars as unsafe */
- for (i = 0; i < sizeof(rfc1738_unsafe_chars); i++) {
- if (*p == rfc1738_unsafe_chars[i]) {
- do_escape = 1;
- break;
- }
- }
- /* RFC 1738 says any control chars (0x00-0x1F) are encoded */
- if ((unsigned char) *p <= (unsigned char) 0x1F) {
- do_escape = 1;
- }
- /* RFC 1738 says 0x7f is encoded */
- if (*p == (char) 0x7F) {
- do_escape = 1;
- }
- /* RFC 1738 says any non-US-ASCII are encoded */
- if (((unsigned char) *p >= (unsigned char) 0x80) &&
- ((unsigned char) *p <= (unsigned char) 0xFF)) {
- do_escape = 1;
- }
- /* Do the triplet encoding, or just copy the char */
- /* note: we do not need snprintf here as q is appropriately
- * allocated - KA */
- if (do_escape == 1) {
- (void) sprintf(q, "%%%02x", (unsigned char) *p);
- q += sizeof(char) * 2;
- } else {
- *q = *p;
- }
- }
- *q = ' ';
- return (buf);
- }
- /*
- * rfc1738_unescape() - Converts escaped characters (%xy numbers) in
- * given the string. %% is a %. %ab is the 8-bit hexadecimal number "ab"
- */
- void
- rfc1738_unescape(char *s)
- {
- char hexnum[3];
- int i, j; /* i is write, j is read */
- unsigned int x;
- for (i = j = 0; s[j]; i++, j++) {
- s[i] = s[j];
- if (s[i] != '%')
- continue;
- if (s[j+1] == '%') { /* %% case */
- j++;
- continue;
- }
- if (s[j+1] && s[j+2]) {
- hexnum[0] = s[j+1];
- hexnum[1] = s[j+2];
- hexnum[2] = ' ';
- if (1 == sscanf(hexnum, "%x", &x)) {
- s[i] = (char) (0x0ff & x);
- j += 2;
- }
- }
- }
- s[i] = ' ';
- }