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/*
** Copyright 2002-2004 Double Precision, Inc. See COPYING for
** distribution information.
*/
/*
** $Id: rfc2231encode.c,v 1.4 2004/04/17 02:14:03 mrsam Exp $
*/
#if HAVE_CONFIG_H
#include "rfc2045_config.h"
#endif
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include "rfc2045.h"
#include <errno.h>
static const char xdigit[]="0123456789ABCDEFabcdef";
#define DOENCODE(c) \
(strchr("()'\"\\%:;=", (c)) || (c) <= ' ' || (c) >= 127)
static int docreate(const char *name,
char *attrvalue,
int (*cb_func)(const char *param,
const char *value,
void *void_arg),
void *cb_arg);
int rfc2231_attrCreate(const char *name, const char *value,
const char *charset,
const char *language,
int (*cb_func)(const char *param,
const char *value,
void *void_arg),
void *cb_arg)
{
size_t l;
const char *cp;
char *p, *q;
int rc;
if (strlen(name)>60)
{
errno=EINVAL;
return -1; /* You kidding me? */
}
for (l=0; value[l]; l++)
if (DOENCODE(value[l]))
break;
if (value[l] == 0 && strlen(name)+strlen(value)<75) /* No need to encode */
{
char *p=malloc(strlen(value)+3);
if (!p)
return -1;
strcat(strcat(strcpy(p, "\""), value), "\"");
rc=(*cb_func)(name, p, cb_arg);
free(p);
return rc;
}
if (!charset) charset="";
if (!language) language="";
l=strlen(charset)+strlen(language)+strlen(value)+3;
for (cp=value; *cp; cp++)
if (DOENCODE(*cp))
l += 2;
p=malloc(l);
if (!p)
return -1;
strcat(strcat(strcat(strcpy(p, charset), "'"),language), "'");
q=p+strlen(p);
for (cp=value; *cp; cp++)
{
if (DOENCODE(*cp))
{
*q++='%';
*q++ = xdigit[ ((unsigned char)*cp / 16) & 15];
*q++ = xdigit[ *cp & 15];
}
else
*q++= *cp;
}
*q=0;
rc=docreate(name, p, cb_func, cb_arg);
free(p);
return rc;
}
static int docreate(const char *name,
char *q,
int (*cb_func)(const char *param,
const char *value,
void *void_arg),
void *cb_arg)
{
char c;
char *r;
int rc;
size_t l;
int n;
r=malloc(strlen(name)+20);
if (!r)
return -1;
rc=0;
n=0;
while (*q)
{
sprintf(r, "%s*%d*", name, n++);
l=strlen(q);
if (l > 70-strlen(r))
l=70-strlen(r);
if (q[l] == '%')
l += 3;
else if (l && q[l-1] == '%')
l += 2;
else if (l > 1 && q[l-2] == '%')
l += 1;
c=q[l];
q[l]=0;
rc=(*cb_func)(r, q, cb_arg);
if (rc)
break;
q[l]=c;
q += l;
}
free(r);
return rc;
}
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