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/*
** Copyright 2003-2004 Double Precision, Inc. See COPYING for
** distribution information.
*/
/*
** $Id: encodeautodetect.c,v 1.1 2004/10/21 00:10:51 mrsam Exp $
*/
#include "encode.h"
#include <string.h>
#include <stdlib.h>
#if HAVE_LIBUNICODE
#include "../unicode/unicode.h"
#endif
static const char *libmail_encode_autodetect(const char *charset,
int (*func)(void *), void *arg)
{
const char *encoding="7bit";
int l=0;
int longline=0;
int c;
#if HAVE_LIBUNICODE
const struct unicode_info *ci = unicode_find(charset);
#endif
while ((c = (*func)(arg)) != EOF)
{
unsigned char ch= (unsigned char)c;
if (ch >= 0x80)
{
#if HAVE_LIBUNICODE
if (!charset || !*charset)
encoding="8bit";
else if (ci && ci->flags & UNICODE_BODY_QUOPRI)
encoding="quoted-printable";
else if (!ci || ci->flags & UNICODE_BODY_BASE64)
encoding="base64";
else
encoding="8bit";
#else
encoding="8bit";
#endif
}
if (ch < 0x20 &&
ch != '\t' && ch != '\r' && ch != '\n')
{
#if HAVE_LIBUNICODE
if (!charset || !*charset)
;
else if (ci && ci->flags & UNICODE_BODY_QUOPRI)
encoding="quoted-printable";
else if (!ci || ci->flags & UNICODE_BODY_BASE64)
encoding="base64";
#else
if (charset && *charset)
encoding="quoted-printable";
#endif
}
if (ch == 0)
return "base64";
if (ch == '\n') l=0;
else if (++l > 990)
{
longline=1;
#if HAVE_LIBUNICODE
if (ci && ci->flags & UNICODE_BODY_QUOPRI)
encoding="quoted-printable";
#else
if (charset && *charset)
encoding="quoted-printable";
#endif
}
}
if (longline)
{
#if HAVE_LIBUNICODE
if (ci && ci->flags & UNICODE_BODY_QUOPRI)
encoding="quoted-printable";
else
encoding="base64";
#else
if (charset && *charset)
encoding="quoted-printable";
else
encoding="base64";
#endif
}
return encoding;
}
struct file_info {
FILE *fp;
off_t pos;
off_t end;
};
static int read_file(void *arg)
{
int c;
struct file_info *fi = (struct file_info *)arg;
if (fi->end >= 0 && fi->pos > fi->end)
return EOF;
c = getc(fi->fp);
fi->pos++;
return c;
}
static int read_string(void * arg)
{
int c;
unsigned char **strp = (unsigned char **)arg;
if (**strp == 0)
return EOF;
c = (int)**strp;
(*strp)++;
return c;
}
const char *libmail_encode_autodetect_fp(FILE *fp, int okQp)
{
if (okQp)
return libmail_encode_autodetect_fppos(fp, "ISO-8859-1", 0, -1);
else
return libmail_encode_autodetect_fppos(fp, NULL, 0, -1);
}
const char *libmail_encode_autodetect_fppos(FILE *fp, const char *charset,
off_t start_pos, off_t end_pos)
{
struct file_info fi;
off_t orig_pos = ftell(fp);
off_t pos = orig_pos;
const char *rc;
if (start_pos >= 0)
{
if (fseek(fp, start_pos, SEEK_SET) == (off_t)-1)
return NULL;
else
pos = start_pos;
}
fi.fp = fp;
fi.pos = pos;
fi.end = end_pos;
rc = libmail_encode_autodetect(charset, &read_file, &fi);
if (fseek(fp, orig_pos, SEEK_SET) == (off_t)-1)
return NULL;
return rc;
}
const char *libmail_encode_autodetect_str(const char *str, const char *charset)
{
return libmail_encode_autodetect(charset, &read_string, &str);
}
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