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/*****************************************************************************
* dvb-text.h:
*****************************************************************************
* Copyright (C) 2007-2011 VLC authors and VideoLAN
*
* 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.
*****************************************************************************/
/**
* Converts a DVB SI text item to UTF-8.
* Refer to EN 800 486 annex A.
* @return a heap-allocation nul-terminated UTF-8 string or NULL on error.
*/
static char *vlc_from_EIT (const void *buf, size_t length)
{
if (unlikely(length == 0))
return NULL;
char encbuf[12];
const char *encoding = encbuf;
const char *in = buf;
size_t offset = 1;
unsigned char c = *in;
if (c >= 0x20)
{
offset = 0;
encoding = "ISO_6937";
}
else if ((1 << c) & 0x0EFE) /* 1-7, 9-11 -> ISO 8859-(c+4) */
{
snprintf (encbuf, sizeof (encbuf), "ISO_8859-%hhu", 4 + c);
}
else switch (c)
{
case 0x10: /* two more bytes */
offset = 3;
if (length < 3 || in[1] != 0x00)
return NULL;
c = in[2];
if ((1 << c) & 0xEFFE) /* 1-11, 13-15 -> ISO 8859-(c) */
snprintf (encbuf, sizeof (encbuf), "ISO_8859-%hhu", c);
else
return NULL;
break;
case 0x11: /* the BMP */
case 0x14: /* Big5 subset of the BMP */
encoding = "UCS-2BE";
break;
case 0x12:
/* DVB has no clue about Korean. KS X 1001 (a.k.a. KS C 5601) is a
* character set, not a character encoding... So we assume EUC-KR.
* It is an encoding of KS X 1001. In practice, I guess nobody uses
* this in any real DVB system. */
encoding = "EUC-KR";
break;
case 0x13: /* GB-2312-1980 */
encoding = "GB2312";
break;
case 0x15:
encoding = "UTF-8";
break;
#if 0
case 0x1F: /* operator-specific(?) */
offset = 2;
#endif
default:
return NULL;
}
in += offset;
length -= offset;
char *out = FromCharset (encoding, in, length);
if (out == NULL)
{ /* Fallback... */
out = strndup (in, length);
if (unlikely(out == NULL))
return NULL;
EnsureUTF8 (out);
}
/* Convert control codes */
for (char *p = strchr (out, '\xC2'); p; p = strchr (p + 1, '\xC2'))
{
/* We have valid UTF-8, to 0xC2 is followed by a continuation byte. */
/* 0x80-0x85,0x88-0x89 are reserved.
* 0x86-0x87 are identical to Unicode and Latin-1.
* 0x8A is CR/LF.
* 0x8B-0x9F are unspecified. */
if (p[1] == '\x8A')
memcpy (p, "\r\n", 2);
}
/* Private use area */
for (char *p = strchr (out, '\xEE'); p; p = strchr (p + 1, '\xEE'))
{
/* Within UTF-8, 0xEE is followed by a two continuation bytes. */
if (p[1] != '\x82')
continue;
if (p[2] == '\x8A')
memcpy (p, "\r\r\n", 3); /* we need three bytes, so to CRs ;) */
}
return out;
}
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