os/bs2000/os.c

/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2000 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 * Portions of this software are based upon public domain software
 * originally written at the National Center for Supercomputing Applications,
 * University of Illinois, Urbana-Champaign.
 */

/*
 * This file will include OS specific functions which are not inlineable.
 * Any inlineable functions should be defined in os-inline.c instead.
 */

#include "httpd.h"
#include "http_core.h"
#include "os.h"

/* Check the Content-Type to decide if conversion is needed */
int ap_checkconv(struct request_rec *r)
{
    int convert_to_ascii;
    const char *type;

    /* To make serving of "raw ASCII text" files easy (they serve faster 
     * since they don't have to be converted from EBCDIC), a new
     * "magic" type prefix was invented: text/x-ascii-{plain,html,...}
     * If we detect one of these content types here, we simply correct
     * the type to the real text/{plain,html,...} type. Otherwise, we
     * set a flag that translation is required later on.
     */

    type = (r->content_type == NULL) ? ap_default_type(r) : r->content_type;

    /* If no content type is set then treat it as (ebcdic) text/plain */
    convert_to_ascii = (type == NULL);

    /* Conversion is applied to text/ files only, if ever. */
    if (type && (strncasecmp(type, "text/", 5) == 0 ||
		 strncasecmp(type, "message/", 8) == 0)) {
	if (strncasecmp(type, ASCIITEXT_MAGIC_TYPE_PREFIX,
			sizeof(ASCIITEXT_MAGIC_TYPE_PREFIX)-1) == 0)
	    r->content_type = ap_pstrcat(r->pool, "text/",
					 type+sizeof(ASCIITEXT_MAGIC_TYPE_PREFIX)-1,
					 NULL);
        else
	    /* translate EBCDIC to ASCII */
	    convert_to_ascii = 1;
    }
    /* Enable conversion if it's a text document */
    ap_bsetflag(r->connection->client, B_EBCDIC2ASCII, convert_to_ascii);

    return convert_to_ascii;
}