From d35747a40c7dea12de95f78a4f283a45ef687597 Mon Sep 17 00:00:00 2001 From: Warren Dukes Date: Mon, 23 Feb 2004 23:41:20 +0000 Subject: import from SF CVS git-svn-id: https://svn.musicpd.org/mpd/trunk@1 09075e82-0dd4-0310-85a5-a0d7c8717e4f --- src/libid3tag/utf16.c | 286 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 286 insertions(+) create mode 100644 src/libid3tag/utf16.c (limited to 'src/libid3tag/utf16.c') diff --git a/src/libid3tag/utf16.c b/src/libid3tag/utf16.c new file mode 100644 index 000000000..8b8f47934 --- /dev/null +++ b/src/libid3tag/utf16.c @@ -0,0 +1,286 @@ +/* + * libid3tag - ID3 tag manipulation library + * Copyright (C) 2000-2003 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: utf16.c,v 1.1 2003/08/14 03:57:13 shank Exp $ + */ + +# ifdef HAVE_CONFIG_H +# include "config.h" +# endif + +# include "global.h" + +# include + +# include "id3tag.h" +# include "utf16.h" +# include "ucs4.h" + +/* + * NAME: utf16->length() + * DESCRIPTION: return the number of ucs4 chars represented by a utf16 string + */ +id3_length_t id3_utf16_length(id3_utf16_t const *utf16) +{ + id3_length_t length = 0; + + while (*utf16) { + if (utf16[0] < 0xd800 || utf16[0] > 0xdfff) + ++length; + else if (utf16[0] >= 0xd800 && utf16[0] <= 0xdbff && + utf16[1] >= 0xdc00 && utf16[1] <= 0xdfff) { + ++length; + ++utf16; + } + + ++utf16; + } + + return length; +} + +/* + * NAME: utf16->size() + * DESCRIPTION: return the encoding size of a utf16 string + */ +id3_length_t id3_utf16_size(id3_utf16_t const *utf16) +{ + id3_utf16_t const *ptr = utf16; + + while (*ptr) + ++ptr; + + return ptr - utf16 + 1; +} + +/* + * NAME: utf16->ucs4duplicate() + * DESCRIPTION: duplicate and decode a utf16 string into ucs4 + */ +id3_ucs4_t *id3_utf16_ucs4duplicate(id3_utf16_t const *utf16) +{ + id3_ucs4_t *ucs4; + + ucs4 = malloc((id3_utf16_length(utf16) + 1) * sizeof(*ucs4)); + if (ucs4) + id3_utf16_decode(utf16, ucs4); + + return release(ucs4); +} + +/* + * NAME: utf16->decodechar() + * DESCRIPTION: decode a series of utf16 chars into a single ucs4 char + */ +id3_length_t id3_utf16_decodechar(id3_utf16_t const *utf16, id3_ucs4_t *ucs4) +{ + id3_utf16_t const *start = utf16; + + while (1) { + if (utf16[0] < 0xd800 || utf16[0] > 0xdfff) { + *ucs4 = utf16[0]; + return utf16 - start + 1; + } + else if (utf16[0] >= 0xd800 && utf16[0] <= 0xdbff && + utf16[1] >= 0xdc00 && utf16[1] <= 0xdfff) { + *ucs4 = (((utf16[0] & 0x03ffL) << 10) | + ((utf16[1] & 0x03ffL) << 0)) + 0x00010000L; + return utf16 - start + 2; + } + + ++utf16; + } +} + +/* + * NAME: utf16->encodechar() + * DESCRIPTION: encode a single ucs4 char into a series of up to 2 utf16 chars + */ +id3_length_t id3_utf16_encodechar(id3_utf16_t *utf16, id3_ucs4_t ucs4) +{ + if (ucs4 < 0x00010000L) { + utf16[0] = ucs4; + + return 1; + } + else if (ucs4 < 0x00110000L) { + ucs4 -= 0x00010000L; + + utf16[0] = ((ucs4 >> 10) & 0x3ff) | 0xd800; + utf16[1] = ((ucs4 >> 0) & 0x3ff) | 0xdc00; + + return 2; + } + + /* default */ + + return id3_utf16_encodechar(utf16, ID3_UCS4_REPLACEMENTCHAR); +} + +/* + * NAME: utf16->decode() + * DESCRIPTION: decode a complete utf16 string into a ucs4 string + */ +void id3_utf16_decode(id3_utf16_t const *utf16, id3_ucs4_t *ucs4) +{ + do + utf16 += id3_utf16_decodechar(utf16, ucs4); + while (*ucs4++); +} + +/* + * NAME: utf16->encode() + * DESCRIPTION: encode a complete ucs4 string into a utf16 string + */ +void id3_utf16_encode(id3_utf16_t *utf16, id3_ucs4_t const *ucs4) +{ + do + utf16 += id3_utf16_encodechar(utf16, *ucs4); + while (*ucs4++); +} + +/* + * NAME: utf16->put() + * DESCRIPTION: serialize a single utf16 character + */ +id3_length_t id3_utf16_put(id3_byte_t **ptr, id3_utf16_t utf16, + enum id3_utf16_byteorder byteorder) +{ + if (ptr) { + switch (byteorder) { + default: + case ID3_UTF16_BYTEORDER_BE: + (*ptr)[0] = (utf16 >> 8) & 0xff; + (*ptr)[1] = (utf16 >> 0) & 0xff; + break; + + case ID3_UTF16_BYTEORDER_LE: + (*ptr)[0] = (utf16 >> 0) & 0xff; + (*ptr)[1] = (utf16 >> 8) & 0xff; + break; + } + + *ptr += 2; + } + + return 2; +} + +/* + * NAME: utf16->get() + * DESCRIPTION: deserialize a single utf16 character + */ +id3_utf16_t id3_utf16_get(id3_byte_t const **ptr, + enum id3_utf16_byteorder byteorder) +{ + id3_utf16_t utf16; + + switch (byteorder) { + default: + case ID3_UTF16_BYTEORDER_BE: + utf16 = + ((*ptr)[0] << 8) | + ((*ptr)[1] << 0); + break; + + case ID3_UTF16_BYTEORDER_LE: + utf16 = + ((*ptr)[0] << 0) | + ((*ptr)[1] << 8); + break; + } + + *ptr += 2; + + return utf16; +} + +/* + * NAME: utf16->serialize() + * DESCRIPTION: serialize a ucs4 string using utf16 encoding + */ +id3_length_t id3_utf16_serialize(id3_byte_t **ptr, id3_ucs4_t const *ucs4, + enum id3_utf16_byteorder byteorder, + int terminate) +{ + id3_length_t size = 0; + id3_utf16_t utf16[2], *out; + + if (byteorder == ID3_UTF16_BYTEORDER_ANY) + size += id3_utf16_put(ptr, 0xfeff, byteorder); + + while (*ucs4) { + switch (id3_utf16_encodechar(out = utf16, *ucs4++)) { + case 2: size += id3_utf16_put(ptr, *out++, byteorder); + case 1: size += id3_utf16_put(ptr, *out++, byteorder); + case 0: break; + } + } + + if (terminate) + size += id3_utf16_put(ptr, 0, byteorder); + + return size; +} + +/* + * NAME: utf16->deserialize() + * DESCRIPTION: deserialize a ucs4 string using utf16 encoding + */ +id3_ucs4_t *id3_utf16_deserialize(id3_byte_t const **ptr, id3_length_t length, + enum id3_utf16_byteorder byteorder) +{ + id3_byte_t const *end; + id3_utf16_t *utf16ptr, *utf16; + id3_ucs4_t *ucs4; + + end = *ptr + (length & ~1); + + utf16 = malloc((length / 2 + 1) * sizeof(*utf16)); + if (utf16 == 0) + return 0; + + if (byteorder == ID3_UTF16_BYTEORDER_ANY && end - *ptr > 0) { + switch (((*ptr)[0] << 8) | + ((*ptr)[1] << 0)) { + case 0xfeff: + byteorder = ID3_UTF16_BYTEORDER_BE; + *ptr += 2; + break; + + case 0xfffe: + byteorder = ID3_UTF16_BYTEORDER_LE; + *ptr += 2; + break; + } + } + + utf16ptr = utf16; + while (end - *ptr > 0 && (*utf16ptr = id3_utf16_get(ptr, byteorder))) + ++utf16ptr; + + *utf16ptr = 0; + + ucs4 = malloc((id3_utf16_length(utf16) + 1) * sizeof(*ucs4)); + if (ucs4) + id3_utf16_decode(utf16, ucs4); + + free(utf16); + + return ucs4; +} -- cgit v1.2.3