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vlc/src/text/unicode.c

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/*****************************************************************************
* unicode.c: Unicode <-> locale functions
*****************************************************************************
* Copyright (C) 2005-2006 VLC authors and VideoLAN
* Copyright © 2005-2010 Rémi Denis-Courmont
*
* Authors: Rémi Denis-Courmont
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <vlc_common.h>
#include "libvlc.h"
#include <vlc_charset.h>
#include <assert.h>
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <sys/types.h>
#if defined(_WIN32)
# include <io.h>
#endif
#include <errno.h>
#include <wctype.h>
/**
* Formats an UTF-8 string as vfprintf(), then print it, with
* appropriate conversion to local encoding.
*/
int utf8_vfprintf( FILE *stream, const char *fmt, va_list ap )
{
#ifndef _WIN32
return vfprintf (stream, fmt, ap);
#else
char *str;
int res = vasprintf (&str, fmt, ap);
if (unlikely(res == -1))
return -1;
#if !VLC_WINSTORE_APP
/* Writing to the console is a lot of fun on Microsoft Windows.
* If you use the standard I/O functions, you must use the OEM code page,
* which is different from the usual ANSI code page. Or maybe not, if the
* user called "chcp". Anyway, we prefer Unicode. */
int fd = _fileno (stream);
if (likely(fd != -1) && _isatty (fd))
{
wchar_t *wide = ToWide (str);
if (likely(wide != NULL))
{
HANDLE h = (HANDLE)((uintptr_t)_get_osfhandle (fd));
DWORD out;
/* XXX: It is not clear whether WriteConsole() wants the number of
* Unicode characters or the size of the wchar_t array. */
BOOL ok = WriteConsoleW (h, wide, wcslen (wide), &out, NULL);
free (wide);
if (ok)
goto out;
}
}
#endif
wchar_t *wide = ToWide(str);
if (likely(wide != NULL))
{
res = fputws(wide, stream);
free(wide);
}
else
res = -1;
out:
free (str);
return res;
#endif
}
/**
* Formats an UTF-8 string as fprintf(), then print it, with
* appropriate conversion to local encoding.
*/
int utf8_fprintf( FILE *stream, const char *fmt, ... )
{
va_list ap;
int res;
va_start( ap, fmt );
res = utf8_vfprintf( stream, fmt, ap );
va_end( ap );
return res;
}
size_t vlc_towc (const char *str, uint32_t *restrict pwc)
{
uint8_t *ptr = (uint8_t *)str, c;
uint32_t cp;
assert (str != NULL);
c = *ptr;
if (unlikely(c > 0xF4))
return -1;
int charlen = clz((unsigned char)(c ^ 0xFF));
switch (charlen)
{
case 0: // 7-bit ASCII character -> short cut
*pwc = c;
return c != '\0';
case 1: // continuation byte -> error
return -1;
case 2:
if (unlikely(c < 0xC2)) // ASCII overlong
return -1;
cp = (c & 0x1F) << 6;
break;
case 3:
cp = (c & 0x0F) << 12;
break;
case 4:
cp = (c & 0x07) << 18;
break;
default:
vlc_assert_unreachable ();
}
/* Unrolled continuation bytes decoding */
switch (charlen)
{
case 4:
c = *++ptr;
if (unlikely((c & 0xC0) != 0x80)) // not a continuation byte
return -1;
cp |= (c & 0x3F) << 12;
if (unlikely(cp >= 0x110000)) // beyond Unicode range
return -1;
/* fall through */
case 3:
c = *++ptr;
if (unlikely((c & 0xC0) != 0x80)) // not a continuation byte
return -1;
cp |= (c & 0x3F) << 6;
if (unlikely(cp >= 0xD800 && cp < 0xE000)) // UTF-16 surrogate
return -1;
if (unlikely(cp < (1u << (5 * charlen - 4)))) // non-ASCII overlong
return -1;
/* fall through */
case 2:
c = *++ptr;
if (unlikely((c & 0xC0) != 0x80)) // not a continuation byte
return -1;
cp |= (c & 0x3F);
break;
}
*pwc = cp;
return charlen;
}
/**
* Look for an UTF-8 string within another one in a case-insensitive fashion.
* Beware that this is quite slow. Contrary to strcasestr(), this function
* works regardless of the system character encoding, and handles multibyte
* code points correctly.
* @param haystack string to look into
* @param needle string to look for
* @return a pointer to the first occurrence of the needle within the haystack,
* or NULL if no occurrence were found.
*/
char *vlc_strcasestr (const char *haystack, const char *needle)
{
ssize_t s;
do
{
const char *h = haystack, *n = needle;
for (;;)
{
uint32_t cph, cpn;
s = vlc_towc (n, &cpn);
if (s == 0)
return (char *)haystack;
if (unlikely(s < 0))
return NULL;
n += s;
s = vlc_towc (h, &cph);
if (s <= 0 || towlower (cph) != towlower (cpn))
break;
h += s;
}
s = vlc_towc (haystack, &(uint32_t) { 0 });
haystack += s;
}
while (s > 0);
return NULL;
}
/**
* Converts a string from the given character encoding to utf-8.
*
* @return a nul-terminated utf-8 string, or null in case of error.
* The result must be freed using free().
*/
char *FromCharset(const char *charset, const void *data, size_t data_size)
{
vlc_iconv_t handle = vlc_iconv_open ("UTF-8", charset);
if (handle == (vlc_iconv_t)(-1))
return NULL;
char *out = NULL;
for(unsigned mul = 4; mul < 8; mul++ )
{
size_t in_size = data_size;
const char *in = data;
size_t out_max = mul * data_size;
char *tmp = out = malloc (1 + out_max);
if (!out)
break;
if (vlc_iconv (handle, &in, &in_size, &tmp, &out_max) != (size_t)(-1)) {
*tmp = '\0';
break;
}
free(out);
out = NULL;
if (errno != E2BIG)
break;
}
vlc_iconv_close(handle);
return out;
}
/**
* Converts a nul-terminated UTF-8 string to a given character encoding.
* @param charset iconv name of the character set
* @param in nul-terminated UTF-8 string
* @param outsize pointer to hold the byte size of result
*
* @return A pointer to the result, which must be released using free().
* The UTF-8 nul terminator is included in the conversion if the target
* character encoding supports it. However it is not included in the returned
* byte size.
* In case of error, NULL is returned and the byte size is undefined.
*/
void *ToCharset(const char *charset, const char *in, size_t *outsize)
{
vlc_iconv_t hd = vlc_iconv_open (charset, "UTF-8");
if (hd == (vlc_iconv_t)(-1))
return NULL;
const size_t inlen = strlen (in);
void *res;
for (unsigned mul = 4; mul < 16; mul++)
{
size_t outlen = mul * (inlen + 1);
res = malloc (outlen);
if (unlikely(res == NULL))
break;
const char *inp = in;
char *outp = res;
size_t inb = inlen;
size_t outb = outlen - mul;
if (vlc_iconv (hd, &inp, &inb, &outp, &outb) != (size_t)(-1))
{
*outsize = outlen - mul - outb;
outb += mul;
inb = 1; /* append nul terminator if possible */
if (vlc_iconv (hd, &inp, &inb, &outp, &outb) != (size_t)(-1))
break;
if (errno == EILSEQ) /* cannot translate nul terminator!? */
break;
}
free (res);
res = NULL;
if (errno != E2BIG) /* conversion failure */
break;
}
vlc_iconv_close (hd);
return res;
}
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