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cog/Libraries/ID3Tag/Files/utf8.c

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/*
* libid3tag - ID3 tag manipulation library
* Copyright (C) 2000-2004 Underbit Technologies, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* $Id: utf8.c,v 1.9 2004/01/23 09:41:32 rob Exp $
*/
# ifdef HAVE_CONFIG_H
# include "config.h"
# endif
# include "global.h"
# include <stdlib.h>
# include "id3tag.h"
# include "utf8.h"
# include "ucs4.h"
/*
* NAME: utf8->length()
* DESCRIPTION: return the number of ucs4 chars represented by a utf8 string
*/
id3_length_t id3_utf8_length(id3_utf8_t const *utf8)
{
id3_length_t length = 0;
while (*utf8) {
if ((utf8[0] & 0x80) == 0x00)
++length;
else if ((utf8[0] & 0xe0) == 0xc0 &&
(utf8[1] & 0xc0) == 0x80) {
if (((utf8[0] & 0x1fL) << 6) >= 0x00000080L) {
++length;
utf8 += 1;
}
}
else if ((utf8[0] & 0xf0) == 0xe0 &&
(utf8[1] & 0xc0) == 0x80 &&
(utf8[2] & 0xc0) == 0x80) {
if ((((utf8[0] & 0x0fL) << 12) |
((utf8[1] & 0x3fL) << 6)) >= 0x00000800L) {
++length;
utf8 += 2;
}
}
else if ((utf8[0] & 0xf8) == 0xf0 &&
(utf8[1] & 0xc0) == 0x80 &&
(utf8[2] & 0xc0) == 0x80 &&
(utf8[3] & 0xc0) == 0x80) {
if ((((utf8[0] & 0x07L) << 18) |
((utf8[1] & 0x3fL) << 12)) >= 0x00010000L) {
++length;
utf8 += 3;
}
}
else if ((utf8[0] & 0xfc) == 0xf8 &&
(utf8[1] & 0xc0) == 0x80 &&
(utf8[2] & 0xc0) == 0x80 &&
(utf8[3] & 0xc0) == 0x80 &&
(utf8[4] & 0xc0) == 0x80) {
if ((((utf8[0] & 0x03L) << 24) |
((utf8[0] & 0x3fL) << 18)) >= 0x00200000L) {
++length;
utf8 += 4;
}
}
else if ((utf8[0] & 0xfe) == 0xfc &&
(utf8[1] & 0xc0) == 0x80 &&
(utf8[2] & 0xc0) == 0x80 &&
(utf8[3] & 0xc0) == 0x80 &&
(utf8[4] & 0xc0) == 0x80 &&
(utf8[5] & 0xc0) == 0x80) {
if ((((utf8[0] & 0x01L) << 30) |
((utf8[0] & 0x3fL) << 24)) >= 0x04000000L) {
++length;
utf8 += 5;
}
}
++utf8;
}
return length;
}
/*
* NAME: utf8->size()
* DESCRIPTION: return the encoding size of a utf8 string
*/
id3_length_t id3_utf8_size(id3_utf8_t const *utf8)
{
id3_utf8_t const *ptr = utf8;
while (*ptr)
++ptr;
return ptr - utf8 + 1;
}
/*
* NAME: utf8->ucs4duplicate()
* DESCRIPTION: duplicate and decode a utf8 string into ucs4
*/
id3_ucs4_t *id3_utf8_ucs4duplicate(id3_utf8_t const *utf8)
{
id3_ucs4_t *ucs4;
ucs4 = malloc((id3_utf8_length(utf8) + 1) * sizeof(*ucs4));
if (ucs4)
id3_utf8_decode(utf8, ucs4);
return release(ucs4);
}
/*
* NAME: utf8->decodechar()
* DESCRIPTION: decode a series of utf8 chars into a single ucs4 char
*/
id3_length_t id3_utf8_decodechar(id3_utf8_t const *utf8, id3_ucs4_t *ucs4)
{
id3_utf8_t const *start = utf8;
while (1) {
if ((utf8[0] & 0x80) == 0x00) {
*ucs4 = utf8[0];
return utf8 - start + 1;
}
else if ((utf8[0] & 0xe0) == 0xc0 &&
(utf8[1] & 0xc0) == 0x80) {
*ucs4 =
((utf8[0] & 0x1fL) << 6) |
((utf8[1] & 0x3fL) << 0);
if (*ucs4 >= 0x00000080L)
return utf8 - start + 2;
}
else if ((utf8[0] & 0xf0) == 0xe0 &&
(utf8[1] & 0xc0) == 0x80 &&
(utf8[2] & 0xc0) == 0x80) {
*ucs4 =
((utf8[0] & 0x0fL) << 12) |
((utf8[1] & 0x3fL) << 6) |
((utf8[2] & 0x3fL) << 0);
if (*ucs4 >= 0x00000800L)
return utf8 - start + 3;
}
else if ((utf8[0] & 0xf8) == 0xf0 &&
(utf8[1] & 0xc0) == 0x80 &&
(utf8[2] & 0xc0) == 0x80 &&
(utf8[3] & 0xc0) == 0x80) {
*ucs4 =
((utf8[0] & 0x07L) << 18) |
((utf8[1] & 0x3fL) << 12) |
((utf8[2] & 0x3fL) << 6) |
((utf8[3] & 0x3fL) << 0);
if (*ucs4 >= 0x00010000L)
return utf8 - start + 4;
}
else if ((utf8[0] & 0xfc) == 0xf8 &&
(utf8[1] & 0xc0) == 0x80 &&
(utf8[2] & 0xc0) == 0x80 &&
(utf8[3] & 0xc0) == 0x80 &&
(utf8[4] & 0xc0) == 0x80) {
*ucs4 =
((utf8[0] & 0x03L) << 24) |
((utf8[1] & 0x3fL) << 18) |
((utf8[2] & 0x3fL) << 12) |
((utf8[3] & 0x3fL) << 6) |
((utf8[4] & 0x3fL) << 0);
if (*ucs4 >= 0x00200000L)
return utf8 - start + 5;
}
else if ((utf8[0] & 0xfe) == 0xfc &&
(utf8[1] & 0xc0) == 0x80 &&
(utf8[2] & 0xc0) == 0x80 &&
(utf8[3] & 0xc0) == 0x80 &&
(utf8[4] & 0xc0) == 0x80 &&
(utf8[5] & 0xc0) == 0x80) {
*ucs4 =
((utf8[0] & 0x01L) << 30) |
((utf8[1] & 0x3fL) << 24) |
((utf8[2] & 0x3fL) << 18) |
((utf8[3] & 0x3fL) << 12) |
((utf8[4] & 0x3fL) << 6) |
((utf8[5] & 0x3fL) << 0);
if (*ucs4 >= 0x04000000L)
return utf8 - start + 6;
}
++utf8;
}
}
/*
* NAME: utf8->encodechar()
* DESCRIPTION: encode a single ucs4 char into a series of up to 6 utf8 chars
*/
id3_length_t id3_utf8_encodechar(id3_utf8_t *utf8, id3_ucs4_t ucs4)
{
if (ucs4 <= 0x0000007fL) {
utf8[0] = ucs4;
return 1;
}
else if (ucs4 <= 0x000007ffL) {
utf8[0] = 0xc0 | ((ucs4 >> 6) & 0x1f);
utf8[1] = 0x80 | ((ucs4 >> 0) & 0x3f);
return 2;
}
else if (ucs4 <= 0x0000ffffL) {
utf8[0] = 0xe0 | ((ucs4 >> 12) & 0x0f);
utf8[1] = 0x80 | ((ucs4 >> 6) & 0x3f);
utf8[2] = 0x80 | ((ucs4 >> 0) & 0x3f);
return 3;
}
else if (ucs4 <= 0x001fffffL) {
utf8[0] = 0xf0 | ((ucs4 >> 18) & 0x07);
utf8[1] = 0x80 | ((ucs4 >> 12) & 0x3f);
utf8[2] = 0x80 | ((ucs4 >> 6) & 0x3f);
utf8[3] = 0x80 | ((ucs4 >> 0) & 0x3f);
return 4;
}
else if (ucs4 <= 0x03ffffffL) {
utf8[0] = 0xf8 | ((ucs4 >> 24) & 0x03);
utf8[1] = 0x80 | ((ucs4 >> 18) & 0x3f);
utf8[2] = 0x80 | ((ucs4 >> 12) & 0x3f);
utf8[3] = 0x80 | ((ucs4 >> 6) & 0x3f);
utf8[4] = 0x80 | ((ucs4 >> 0) & 0x3f);
return 5;
}
else if (ucs4 <= 0x7fffffffL) {
utf8[0] = 0xfc | ((ucs4 >> 30) & 0x01);
utf8[1] = 0x80 | ((ucs4 >> 24) & 0x3f);
utf8[2] = 0x80 | ((ucs4 >> 18) & 0x3f);
utf8[3] = 0x80 | ((ucs4 >> 12) & 0x3f);
utf8[4] = 0x80 | ((ucs4 >> 6) & 0x3f);
utf8[5] = 0x80 | ((ucs4 >> 0) & 0x3f);
return 6;
}
/* default */
return id3_utf8_encodechar(utf8, ID3_UCS4_REPLACEMENTCHAR);
}
/*
* NAME: utf8->decode()
* DESCRIPTION: decode a complete utf8 string into a ucs4 string
*/
void id3_utf8_decode(id3_utf8_t const *utf8, id3_ucs4_t *ucs4)
{
do
utf8 += id3_utf8_decodechar(utf8, ucs4);
while (*ucs4++);
}
/*
* NAME: utf8->encode()
* DESCRIPTION: encode a complete ucs4 string into a utf8 string
*/
void id3_utf8_encode(id3_utf8_t *utf8, id3_ucs4_t const *ucs4)
{
do
utf8 += id3_utf8_encodechar(utf8, *ucs4);
while (*ucs4++);
}
/*
* NAME: utf8->put()
* DESCRIPTION: serialize a single utf8 character
*/
id3_length_t id3_utf8_put(id3_byte_t **ptr, id3_utf8_t utf8)
{
if (ptr)
*(*ptr)++ = utf8;
return 1;
}
/*
* NAME: utf8->get()
* DESCRIPTION: deserialize a single utf8 character
*/
id3_utf8_t id3_utf8_get(id3_byte_t const **ptr)
{
return *(*ptr)++;
}
/*
* NAME: utf8->serialize()
* DESCRIPTION: serialize a ucs4 string using utf8 encoding
*/
id3_length_t id3_utf8_serialize(id3_byte_t **ptr, id3_ucs4_t const *ucs4,
int terminate)
{
id3_length_t size = 0;
id3_utf8_t utf8[6], *out;
while (*ucs4) {
switch (id3_utf8_encodechar(out = utf8, *ucs4++)) {
case 6: size += id3_utf8_put(ptr, *out++);
case 5: size += id3_utf8_put(ptr, *out++);
case 4: size += id3_utf8_put(ptr, *out++);
case 3: size += id3_utf8_put(ptr, *out++);
case 2: size += id3_utf8_put(ptr, *out++);
case 1: size += id3_utf8_put(ptr, *out++);
case 0: break;
}
}
if (terminate)
size += id3_utf8_put(ptr, 0);
return size;
}
/*
* NAME: utf8->deserialize()
* DESCRIPTION: deserialize a ucs4 string using utf8 encoding
*/
id3_ucs4_t *id3_utf8_deserialize(id3_byte_t const **ptr, id3_length_t length)
{
id3_byte_t const *end;
id3_utf8_t *utf8ptr, *utf8;
id3_ucs4_t *ucs4;
end = *ptr + length;
utf8 = malloc((length + 1) * sizeof(*utf8));
if (utf8 == 0)
return 0;
utf8ptr = utf8;
while (end - *ptr > 0 && (*utf8ptr = id3_utf8_get(ptr)))
++utf8ptr;
*utf8ptr = 0;
ucs4 = malloc((id3_utf8_length(utf8) + 1) * sizeof(*ucs4));
if (ucs4)
id3_utf8_decode(utf8, ucs4);
free(utf8);
return ucs4;
}
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