ETag.c
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上传日期:2007-01-04
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- /*
- * $Id: ETag.c,v 1.5 1998/08/13 21:14:39 wessels Exp $
- *
- * AUTHOR: Alex Rousskov
- *
- * 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 "squid.h"
- /*
- * Note: ETag is not an http "field" like, for example HttpHdrRange. ETag is a
- * field-value that maybe used in many http fields.
- */
- /* parses a string as weak or strong entity-tag; returns true on success */
- /* note: we do not duplicate "str"! */
- int
- etagParseInit(ETag * etag, const char *str)
- {
- int len;
- assert(etag && str);
- etag->str = NULL;
- etag->weak = !strncmp(str, "W/", 2);
- if (etag->weak)
- str += 2;
- /* check format (quoted-string) */
- len = strlen(str);
- if (len >= 2 && str[0] == '"' && str[len - 1] == '"')
- etag->str = str;
- return etag->str != NULL;
- }
- /* returns true if etags are equal */
- int
- etagIsEqual(const ETag * tag1, const ETag * tag2)
- {
- assert(tag1 && tag2);
- assert(!tag1->weak && !tag2->weak); /* weak comparison not implemented yet */
- return !strcmp(tag1->str, tag2->str);
- }