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rfc2045acchk.c：源码内容

							/*
** Copyright 1998 - 1999 Double Precision, Inc.  See COPYING for
** distribution information.
*/
#if	HAVE_CONFIG_H
#include	"config.h"
#endif
#include	"rfc2045.h"
#include	<string.h>
#if	HAVE_STRINGS_H
#include	<strings.h>
#endif
#include	<stdlib.h>
#include	<stdio.h>
/* $Id: rfc2045acchk.c,v 1.4 2000/03/13 04:43:49 mrsam Exp $ */
extern void rfc2045_enomem();
int rfc2045_ac_check(struct rfc2045 *p, int rwmode)
{
int	flag=0;		/* Flag - rewriting suggested */
struct	rfc2045 *c;
int	hasnon7bit=p->has8bitchars;
		/* hasnon7bit: 8bit chars in this section or subsections */
const char *te;
int	is8bitte;
	for (c=p->firstpart; c; c=c->next)
		if (!c->isdummy)
		{
			if (rfc2045_ac_check(c, rwmode))	flag=1;
			if (strcmp(c->content_transfer_encoding, "7bit") &&
				strcmp(c->content_transfer_encoding, "quoted-printable"))
				hasnon7bit=1;
			if (c->has8bitchars)
				p->has8bitchars=1;
		}
	if (RFC2045_ISMIME1DEF(p->mime_version) && !p->content_type)
	{
		if ((p->content_type=strdup("text/plain")) == 0)
			rfc2045_enomem();
		if (p->mime_version)
		{
			flag=1;
		}
	}
	if (RFC2045_ISMIME1DEF(p->mime_version)
		&& !rfc2045_getattr(p->content_type_attr, "charset")
		&& strncasecmp(p->content_type, "text/", 5) == 0)
	{
		rfc2045_setattr(&p->content_type_attr, "charset",
			rfc2045_getdefaultcharset());
		if (p->mime_version
			&& p->firstpart == 0 /* sam - don't trigger rewrites on changes to multipart headers */
			)
		{
			flag=1;
		}
	}
	if (RFC2045_ISMIME1DEF(p->mime_version)
		&& !p->content_transfer_encoding)
	{
		if ((p->content_transfer_encoding=strdup(
			hasnon7bit ? "8bit":"7bit")) == 0)
			rfc2045_enomem();
		if (p->mime_version
			&& p->firstpart == 0 /* sam - don't trigger rewrites on changes to multipart headers */
			)
		{
			flag=1;
		}
	}
#if 0
	if (RFC2045_ISMIME1DEF(p->mime_version)
		&& strncmp(p->content_type, "text/", 5) == 0 && !hasnon7bit
		&& strcmp(p->content_transfer_encoding, "7bit"))
	{
		if (p->mime_version)
		{
			flag=1;
		}
	}
#endif
	if (RFC2045_ISMIME1DEF(p->mime_version))
	{
		/* Check for conversions */
		te=p->content_transfer_encoding;
		is8bitte=strcasecmp(te, "base64") &&
			strcasecmp(te, "quoted-printable") &&
			strcasecmp(te, "7bit");	/* 8 bit contents */
		if (is8bitte && !p->has8bitchars && !p->haslongline)
		{
			if (p->rw_transfer_encoding)
				free(p->rw_transfer_encoding);
			if ((p->rw_transfer_encoding=strdup("7bit")) == 0)
				rfc2045_enomem();
			flag=1;
			is8bitte=0;
		}
		if (rwmode == RFC2045_RW_7BIT && (is8bitte || p->haslongline))
		{
			if (p->rw_transfer_encoding)
				free(p->rw_transfer_encoding);
			if ((p->rw_transfer_encoding=strdup("quoted-printable"))
				== 0)
				rfc2045_enomem();
			flag=1;
		}
		else if (rwmode == RFC2045_RW_8BIT &&
			strcasecmp(te, "quoted-printable") == 0 &&
			!p->haslongline)
		{
			if (p->rw_transfer_encoding)
				free(p->rw_transfer_encoding);
			if ((p->rw_transfer_encoding=strdup(hasnon7bit
					? "8bit":"7bit")) == 0)
				rfc2045_enomem();
			flag=1;
		}
	}
	if (!p->mime_version)
	{
		if ((p->mime_version=strdup("1.0")) == 0)
			rfc2045_enomem();
	}
	return (flag);
}

						