uri.c

SIP 1.5.0源代码

			default: ret[len++] = '0' + (val / 0x10);
		    }
		    switch (val % 0x10) {
			case 0xF: ret[len++] = 'F'; break;
			case 0xE: ret[len++] = 'E'; break;
			case 0xD: ret[len++] = 'D'; break;
			case 0xC: ret[len++] = 'C'; break;
			case 0xB: ret[len++] = 'B'; break;
			case 0xA: ret[len++] = 'A'; break;
			default: ret[len++] = '0' + (val % 0x10);
		    }
		}
	    }
	}
	if (len >= max) {
	    max *= 2;
	    ret = xmlRealloc(ret, (max + 1) * sizeof(xmlChar));
	    if (ret == NULL) {
		fprintf(stderr, "xmlSaveUri: out of memory\n");
		return(NULL);
	    }
	}
	ret[len++] = 0;
    }
    return(ret);
}

/**
 * xmlPrintURI:
 * @stream:  a FILE* for the output
 * @uri:  pointer to an xmlURI
 *
 * Prints the URI in the stream @steam.
 */
void
xmlPrintURI(FILE *stream, xmlURIPtr uri) {
    xmlChar *out;

    out = xmlSaveUri(uri);
    if (out != NULL) {
	fprintf(stream, "%s", out);
	xmlFree(out);
    }
}

/**
 * xmlCleanURI:
 * @uri:  pointer to an xmlURI
 *
 * Make sure the xmlURI struct is free of content
 */
void
xmlCleanURI(xmlURIPtr uri) {
    if (uri == NULL) return;

    if (uri->scheme != NULL) xmlFree(uri->scheme);
    uri->scheme = NULL;
    if (uri->server != NULL) xmlFree(uri->server);
    uri->server = NULL;
    if (uri->user != NULL) xmlFree(uri->user);
    uri->user = NULL;
    if (uri->path != NULL) xmlFree(uri->path);
    uri->path = NULL;
    if (uri->fragment != NULL) xmlFree(uri->fragment);
    uri->fragment = NULL;
    if (uri->opaque != NULL) xmlFree(uri->opaque);
    uri->opaque = NULL;
    if (uri->authority != NULL) xmlFree(uri->authority);
    uri->authority = NULL;
    if (uri->query != NULL) xmlFree(uri->query);
    uri->query = NULL;
}

/**
 * xmlFreeURI:
 * @uri:  pointer to an xmlURI
 *
 * Free up the xmlURI struct
 */
void
xmlFreeURI(xmlURIPtr uri) {
    if (uri == NULL) return;

    if (uri->scheme != NULL) xmlFree(uri->scheme);
    if (uri->server != NULL) xmlFree(uri->server);
    if (uri->user != NULL) xmlFree(uri->user);
    if (uri->path != NULL) xmlFree(uri->path);
    if (uri->fragment != NULL) xmlFree(uri->fragment);
    if (uri->opaque != NULL) xmlFree(uri->opaque);
    if (uri->authority != NULL) xmlFree(uri->authority);
    if (uri->query != NULL) xmlFree(uri->query);
    memset(uri, -1, sizeof(xmlURI));
    xmlFree(uri);
}

/**
 * xmlURIUnescapeString:
 * @str:  the string to unescape
 * @len:   the lenght in bytes to unescape (or <= 0 to indicate full string)
 * @target:  optionnal destination buffer
 *
 * Unescaping routine, does not do validity checks !
 * Output is direct unsigned char translation of %XX values (no encoding)
 *
 * Returns an copy of the string, but unescaped
 */
char *
xmlURIUnescapeString(const char *str, int len, char *target) {
    char *ret, *out;
    const char *in;

    if (str == NULL)
	return(NULL);
    if (len <= 0) len = strlen(str);
    if (len <= 0) return(NULL);

    if (target == NULL) {
	ret = (char *) xmlMalloc(len + 1);
	if (ret == NULL) {
	    fprintf(stderr, "xmlURIUnescapeString: out of memory\n");
	    return(NULL);
	}
    } else
	ret = target;
    in = str;
    out = ret;
    while(len > 0) {
	if (*in == '%') {
	    in++;
	    if ((*in >= '0') && (*in <= '9')) 
	        *out = (*in - '0');
	    else if ((*in >= 'a') && (*in <= 'f'))
	        *out = (*in - 'a') + 10;
	    else if ((*in >= 'A') && (*in <= 'F'))
	        *out = (*in - 'A') + 10;
	    in++;
	    if ((*in >= '0') && (*in <= '9')) 
	        *out = *out * 16 + (*in - '0');
	    else if ((*in >= 'a') && (*in <= 'f'))
	        *out = *out * 16 + (*in - 'a') + 10;
	    else if ((*in >= 'A') && (*in <= 'F'))
	        *out = *out * 16 + (*in - 'A') + 10;
	    in++;
	    len -= 3;
	    out++;
	} else {
	    *out++ = *in++;
	    len--;
	}
    }
    *out = 0;
    return(ret);
}


/**
 * xmlParseURIFragment:
 * @uri:  pointer to an URI structure
 * @str:  pointer to the string to analyze
 *
 * Parse an URI fragment string and fills in the appropriate fields
 * of the @uri structure.
 * 
 * fragment = *uric
 *
 * Returns 0 or the error code
 */
int
xmlParseURIFragment(xmlURIPtr uri, const char **str) {
    const char *cur = *str;

    if (str == NULL) return(-1);

    while (IS_URIC(cur)) NEXT(cur);
    if (uri != NULL) {
	if (uri->fragment != NULL) xmlFree(uri->fragment);
	uri->fragment = xmlURIUnescapeString(*str, cur - *str, NULL);
    }
    *str = cur;
    return(0);
}

/**
 * xmlParseURIQuery:
 * @uri:  pointer to an URI structure
 * @str:  pointer to the string to analyze
 *
 * Parse the query part of an URI
 * 
 * query = *uric
 *
 * Returns 0 or the error code
 */
int
xmlParseURIQuery(xmlURIPtr uri, const char **str) {
    const char *cur = *str;

    if (str == NULL) return(-1);

    while (IS_URIC(cur)) NEXT(cur);
    if (uri != NULL) {
	if (uri->query != NULL) xmlFree(uri->query);
	uri->query = xmlURIUnescapeString(*str, cur - *str, NULL);
    }
    *str = cur;
    return(0);
}

/**
 * xmlParseURIScheme:
 * @uri:  pointer to an URI structure
 * @str:  pointer to the string to analyze
 *
 * Parse an URI scheme
 * 
 * scheme = alpha *( alpha | digit | "+" | "-" | "." )
 *
 * Returns 0 or the error code
 */
int
xmlParseURIScheme(xmlURIPtr uri, const char **str) {
    const char *cur;

    if (str == NULL)
	return(-1);
    
    cur = *str;
    if (!IS_ALPHA(*cur))
	return(2);
    cur++;
    while (IS_SCHEME(*cur)) cur++;
    if (uri != NULL) {
	if (uri->scheme != NULL) xmlFree(uri->scheme);
	uri->scheme = xmlURIUnescapeString(*str, cur - *str, NULL); /* !!! strndup */
    }
    *str = cur;
    return(0);
}

/**
 * xmlParseURIOpaquePart:
 * @uri:  pointer to an URI structure
 * @str:  pointer to the string to analyze
 *
 * Parse an URI opaque part
 * 
 * opaque_part = uric_no_slash *uric
 *
 * Returns 0 or the error code
 */
int
xmlParseURIOpaquePart(xmlURIPtr uri, const char **str) {
    const char *cur;

    if (str == NULL)
	return(-1);
    
    cur = *str;
    if (!IS_URIC_NO_SLASH(cur)) {
	return(3);
    }
    NEXT(cur);
    while (IS_URIC(cur)) NEXT(cur);
    if (uri != NULL) {
	if (uri->opaque != NULL) xmlFree(uri->opaque);
	uri->opaque = xmlURIUnescapeString(*str, cur - *str, NULL);
    }
    *str = cur;
    return(0);
}

/**
 * xmlParseURIServer:
 * @uri:  pointer to an URI structure
 * @str:  pointer to the string to analyze
 *
 * Parse a server subpart of an URI, it's a finer grain analysis
 * of the authority part.
 * 
 * server        = [ [ userinfo "@" ] hostport ]
 * userinfo      = *( unreserved | escaped |
 *                       ";" | ":" | "&" | "=" | "+" | "$" | "," )
 * hostport      = host [ ":" port ]
 * host          = hostname | IPv4address
 * hostname      = *( domainlabel "." ) toplabel [ "." ]
 * domainlabel   = alphanum | alphanum *( alphanum | "-" ) alphanum
 * toplabel      = alpha | alpha *( alphanum | "-" ) alphanum
 * IPv4address   = 1*digit "." 1*digit "." 1*digit "." 1*digit
 * port          = *digit
 *
 * Returns 0 or the error code
 */
int
xmlParseURIServer(xmlURIPtr uri, const char **str) {
    const char *cur;
    const char *host, *tmp;

    if (str == NULL)
	return(-1);
    
    cur = *str;

    /*
     * is there an userinfo ?
     */
    while (IS_USERINFO(cur)) NEXT(cur);
    if (*cur == '@') {
	if (uri != NULL) {
	    if (uri->user != NULL) xmlFree(uri->user);
	    uri->user = xmlURIUnescapeString(*str, cur - *str, NULL);
	}
	cur++;
    } else {
	if (uri != NULL) {
	    if (uri->user != NULL) xmlFree(uri->user);
	    uri->user = NULL;
	}
        cur = *str;
    }
    /*
     * host part of hostport can derive either an IPV4 address
     * or an unresolved name. Check the IP first, it easier to detect
     * errors if wrong one
     */
    host = cur;
    if (IS_DIGIT(*cur)) {
        while(IS_DIGIT(*cur)) cur++;
	if (*cur != '.')
	    goto host_name;
	cur++;
	if (!IS_DIGIT(*cur))
	    goto host_name;
        while(IS_DIGIT(*cur)) cur++;
	if (*cur != '.')
	    goto host_name;
	cur++;
	if (!IS_DIGIT(*cur))
	    goto host_name;
        while(IS_DIGIT(*cur)) cur++;
	if (*cur != '.')
	    goto host_name;
	cur++;
	if (!IS_DIGIT(*cur))
	    goto host_name;
        while(IS_DIGIT(*cur)) cur++;
	if (uri != NULL) {
	    if (uri->authority != NULL) xmlFree(uri->authority);
	    uri->authority = NULL;
	    if (uri->server != NULL) xmlFree(uri->server);
	    uri->server = xmlURIUnescapeString(host, cur - host, NULL);
	}
	goto host_done;
    }
host_name:
    /*
     * the hostname production as-is is a parser nightmare.
     * simplify it to 
     * hostname = *( domainlabel "." ) domainlabel [ "." ]
     * and just make sure the last label starts with a non numeric char.
     */
    if (!IS_ALPHANUM(*cur))
        return(6);
    while (IS_ALPHANUM(*cur)) {
        while ((IS_ALPHANUM(*cur)) || (*cur == '-')) cur++;
	if (*cur == '.')
	    cur++;
    }
    tmp = cur;
    tmp--;
    while (IS_ALPHANUM(*tmp) && (*tmp != '.') && (tmp >= host)) tmp--;
    tmp++;
    if (!IS_ALPHA(*tmp))
        return(7);
    if (uri != NULL) {
	if (uri->authority != NULL) xmlFree(uri->authority);
	uri->authority = NULL;
	if (uri->server != NULL) xmlFree(uri->server);
	uri->server = xmlURIUnescapeString(host, cur - host, NULL);
    }

host_done:

    /*
     * finish by checking for a port presence.
     */
    if (*cur == ':') {
        cur++;
	if (IS_DIGIT(*cur)) {
	    if (uri != NULL)
	        uri->port = 0;
	    while (IS_DIGIT(*cur)) {
	        if (uri != NULL)
		    uri->port = uri->port * 10 + (*cur - '0');
		cur++;
	    }
	}
    }
    *str = cur;
    return(0);
}	

/**
 * xmlParseURIRelSegment:
 * @uri:  pointer to an URI structure
 * @str:  pointer to the string to analyze
 *
 * Parse an URI relative segment
 * 
 * rel_segment = 1*( unreserved | escaped | ";" | "@" | "&" | "=" |
 *                          "+" | "$" | "," )
 *
 * Returns 0 or the error code
 */
int
xmlParseURIRelSegment(xmlURIPtr uri, const char **str) {
    const char *cur;

    if (str == NULL)
	return(-1);
    
    cur = *str;
    if (!IS_SEGMENT(cur)) {
	return(3);
    }
    NEXT(cur);
    while (IS_SEGMENT(cur)) NEXT(cur);
    if (uri != NULL) {
	if (uri->path != NULL) xmlFree(uri->path);
	uri->path = xmlURIUnescapeString(*str, cur - *str, NULL);
    }
    *str = cur;
    return(0);
}

/**
 * xmlParseURIPathSegments:
 * @uri:  pointer to an URI structure
 * @str:  pointer to the string to analyze
 * @slash:  should we add a leading slash
 *
 * Parse an URI set of path segments
 * 
 * path_segments = segment *( "/" segment )
 * segment       = *pchar *( ";" param )
 * param         = *pchar
 *
 * Returns 0 or the error code
 */
int
xmlParseURIPathSegments(xmlURIPtr uri, const char **str, int slash) {
    const char *cur;

    if (str == NULL)
	return(-1);
    
    cur = *str;

    do {
	while (IS_PCHAR(cur)) NEXT(cur);
	if (*cur == ';') {
	    cur++;
	    while (IS_PCHAR(cur)) NEXT(cur);
	}
	if (*cur != '/') break;
	cur++;
    } while (1);
    if (uri != NULL) {
	int len, len2 = 0;
	char *path;

	/*
	 * Concat the set of path segments to the current path
	 */
	len = cur - *str;
	if (slash)
	    len++;

	if (uri->path != NULL) {
	    len2 = strlen(uri->path);
	    len += len2;
	}
        path = (char *) xmlMalloc(len + 1);
	if (path == NULL) {
	    fprintf(stderr, "xmlParseURIPathSegments: out of memory\n");
	    *str = cur;
	    return(-1);
	}
	if (uri->path != NULL)
	    memcpy(path, uri->path, len2);
	if (slash) {
	    path[len2] = '/';
	    len2++;
	}
	xmlURIUnescapeString(*str, cur - *str, &path[len2]);
	if (uri->path != NULL)
	    xmlFree(uri->path);
	uri->path = path;
    }
    *str = cur;
    return(0);
}

/**
 * xmlParseURIAuthority:
 * @uri:  pointer to an URI structure
 * @str:  pointer to the string to analyze
 *
 * Parse the authority part of an URI.
 * 
 * authority = server | reg_name
 * server    = [ [ userinfo "@" ] hostport ]
 * reg_name  = 1*( unreserved | escaped | "$" | "," | ";" | ":" |
 *                        "@" | "&" | "=" | "+" )
 *
 * Note : this is completely ambiguous since reg_name is allowed to
 *        use the full set of chars in use by server:
 *
 *        3.2.1. Registry-based Naming Authority
 *
 *        The structure of a registry-based naming authority is specific
 *        to the URI scheme, but constrained to the allowed characters
 *        for an authority component.
 *
 * Returns 0 or the error code
 */
int
xmlParseURIAuthority(xmlURIPtr uri, const char **str) {
    const char *cur;
    int ret;

    if (str == NULL)
	return(-1);
    
    cur = *str;

    /*
     * try first to parse it as a server string.
     */
    ret = xmlParseURIServer(uri, str);
    if (ret == 0)