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/* Copyright (c) 2002-2018 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "buffer.h"
#include "charset-utf8-private.h"
#ifdef HAVE_ICONV
#include <iconv.h>
#include <ctype.h>
struct charset_translation {
iconv_t cd;
normalizer_func_t *normalizer;
};
static int
iconv_charset_to_utf8_begin(const char *charset, normalizer_func_t *normalizer,
struct charset_translation **t_r)
{
struct charset_translation *t;
iconv_t cd;
if (charset_is_utf8(charset))
cd = (iconv_t)-1;
else {
if (strcmp(charset, "UTF-8//TEST") == 0)
charset = "UTF-8";
cd = iconv_open("UTF-8", charset);
if (cd == (iconv_t)-1)
return -1;
}
t = i_new(struct charset_translation, 1);
t->cd = cd;
t->normalizer = normalizer;
*t_r = t;
return 0;
}
static void iconv_charset_to_utf8_end(struct charset_translation *t)
{
if (t->cd != (iconv_t)-1)
iconv_close(t->cd);
i_free(t);
}
static void iconv_charset_to_utf8_reset(struct charset_translation *t)
{
if (t->cd != (iconv_t)-1)
(void)iconv(t->cd, NULL, NULL, NULL, NULL);
}
static bool
charset_to_utf8_try(struct charset_translation *t,
const unsigned char *src, size_t *src_size, buffer_t *dest,
enum charset_result *result)
{
ICONV_CONST char *ic_srcbuf;
char tmpbuf[8192], *ic_destbuf;
size_t srcleft, destleft, tmpbuf_used;
bool ret = TRUE;
if (t->cd == (iconv_t)-1) {
/* input is already supposed to be UTF-8 */
*result = charset_utf8_to_utf8(t->normalizer, src, src_size, dest);
return TRUE;
}
destleft = sizeof(tmpbuf);
ic_destbuf = tmpbuf;
srcleft = *src_size;
ic_srcbuf = (ICONV_CONST char *) src;
if (iconv(t->cd, &ic_srcbuf, &srcleft,
&ic_destbuf, &destleft) != SIZE_MAX) {
i_assert(srcleft == 0);
*result = CHARSET_RET_OK;
} else if (errno == E2BIG) {
/* set result just to avoid compiler warning */
*result = CHARSET_RET_INCOMPLETE_INPUT;
ret = FALSE;
} else if (errno == EINVAL) {
i_assert(srcleft <= CHARSET_MAX_PENDING_BUF_SIZE);
*result = CHARSET_RET_INCOMPLETE_INPUT;
} else {
/* should be EILSEQ */
*result = CHARSET_RET_INVALID_INPUT;
ret = FALSE;
}
*src_size -= srcleft;
/* we just converted data to UTF-8. it shouldn't be invalid, but
Solaris iconv appears to pass invalid data through sometimes
(e.g. 8 bit characters with UTF-7) */
tmpbuf_used = sizeof(tmpbuf) - destleft;
if (charset_utf8_to_utf8(t->normalizer, (void *)tmpbuf,
&tmpbuf_used, dest) != CHARSET_RET_OK)
*result = CHARSET_RET_INVALID_INPUT;
return ret;
}
static enum charset_result
iconv_charset_to_utf8(struct charset_translation *t,
const unsigned char *src, size_t *src_size,
buffer_t *dest)
{
enum charset_result result;
size_t pos, size;
size_t prev_invalid_pos = SIZE_MAX;
bool ret;
for (pos = 0;;) {
i_assert(pos <= *src_size);
size = *src_size - pos;
ret = charset_to_utf8_try(t, src + pos, &size, dest, &result);
pos += size;
if (ret)
break;
if (result == CHARSET_RET_INVALID_INPUT) {
if (prev_invalid_pos != dest->used) {
buffer_append(dest, UNICODE_REPLACEMENT_CHAR_UTF8,
strlen(UNICODE_REPLACEMENT_CHAR_UTF8));
prev_invalid_pos = dest->used;
}
if (pos < *src_size)
pos++;
}
}
if (prev_invalid_pos != SIZE_MAX)
result = CHARSET_RET_INVALID_INPUT;
i_assert(*src_size - pos <= CHARSET_MAX_PENDING_BUF_SIZE);
*src_size = pos;
return result;
}
const struct charset_utf8_vfuncs charset_iconv = {
.to_utf8_begin = iconv_charset_to_utf8_begin,
.to_utf8_end = iconv_charset_to_utf8_end,
.to_utf8_reset = iconv_charset_to_utf8_reset,
.to_utf8 = iconv_charset_to_utf8,
};
#endif
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