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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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