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/*
** Copyright 2003-2011 Double Precision, Inc. See COPYING for
** distribution information.
*/
/*
*/
#include "encode.h"
#include <string.h>
#include <stdlib.h>
#include <courier-unicode.h>
static const char *libmail_encode_autodetect(int use7bit,
int (*func)(void *), void *arg,
int *binaryflag)
{
int l=0;
int longline=0;
int c;
size_t charcnt=0;
size_t bit8cnt=0;
if (binaryflag)
*binaryflag=0;
while ((c = (*func)(arg)) != EOF)
{
unsigned char ch= (unsigned char)c;
++charcnt;
++l;
if (ch < 0x20 || ch >= 0x80)
{
if (ch != '\t' && ch != '\r' && ch != '\n')
{
++bit8cnt;
l += 2;
}
}
if (ch == 0)
{
if (binaryflag)
*binaryflag=1;
return "base64";
}
if (ch == '\n') l=0;
else if (l > 990)
{
longline=1;
}
}
if (use7bit || longline)
{
if (bit8cnt > charcnt / 10)
return "base64";
return "quoted-printable";
}
return bit8cnt ? "8bit":"7bit";
}
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 use7bit,
int *binaryflag)
{
return libmail_encode_autodetect_fpoff(fp, use7bit, 0, -1,
binaryflag);
}
const char *libmail_encode_autodetect_fpoff(FILE *fp, int use7bit,
off_t start_pos, off_t end_pos,
int *binaryflag)
{
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(use7bit, &read_file, &fi,
binaryflag);
if (fseek(fp, orig_pos, SEEK_SET) == (off_t)-1)
return NULL;
return rc;
}
const char *libmail_encode_autodetect_buf(const char *str, int use7bit)
{
return libmail_encode_autodetect(use7bit, &read_string, &str,
NULL);
}
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