mirror of
https://github.com/cookiengineer/audacity
synced 2025-10-31 14:13:50 +01:00
366 lines
8.6 KiB
C
366 lines
8.6 KiB
C
/*
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* libid3tag - ID3 tag manipulation library
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* Copyright (C) 2000-2004 Underbit Technologies, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* $Id: utf8.c,v 1.3 2004-06-08 06:38:15 dmazzoni Exp $
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*/
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# ifdef HAVE_CONFIG_H
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# include "config.h"
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# endif
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# include "global.h"
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# include <stdlib.h>
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# include "id3tag.h"
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# include "utf8.h"
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# include "ucs4.h"
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/*
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* NAME: utf8->length()
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* DESCRIPTION: return the number of ucs4 chars represented by a utf8 string
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*/
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id3_length_t id3_utf8_length(id3_utf8_t const *utf8)
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{
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id3_length_t length = 0;
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while (*utf8) {
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if ((utf8[0] & 0x80) == 0x00)
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++length;
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else if ((utf8[0] & 0xe0) == 0xc0 &&
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(utf8[1] & 0xc0) == 0x80) {
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if (((utf8[0] & 0x1fL) << 6) >= 0x00000080L) {
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++length;
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utf8 += 1;
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}
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}
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else if ((utf8[0] & 0xf0) == 0xe0 &&
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(utf8[1] & 0xc0) == 0x80 &&
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(utf8[2] & 0xc0) == 0x80) {
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if ((((utf8[0] & 0x0fL) << 12) |
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((utf8[1] & 0x3fL) << 6)) >= 0x00000800L) {
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++length;
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utf8 += 2;
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}
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}
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else if ((utf8[0] & 0xf8) == 0xf0 &&
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(utf8[1] & 0xc0) == 0x80 &&
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(utf8[2] & 0xc0) == 0x80 &&
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(utf8[3] & 0xc0) == 0x80) {
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if ((((utf8[0] & 0x07L) << 18) |
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((utf8[1] & 0x3fL) << 12)) >= 0x00010000L) {
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++length;
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utf8 += 3;
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}
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}
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else if ((utf8[0] & 0xfc) == 0xf8 &&
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(utf8[1] & 0xc0) == 0x80 &&
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(utf8[2] & 0xc0) == 0x80 &&
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(utf8[3] & 0xc0) == 0x80 &&
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(utf8[4] & 0xc0) == 0x80) {
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if ((((utf8[0] & 0x03L) << 24) |
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((utf8[0] & 0x3fL) << 18)) >= 0x00200000L) {
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++length;
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utf8 += 4;
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}
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}
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else if ((utf8[0] & 0xfe) == 0xfc &&
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(utf8[1] & 0xc0) == 0x80 &&
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(utf8[2] & 0xc0) == 0x80 &&
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(utf8[3] & 0xc0) == 0x80 &&
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(utf8[4] & 0xc0) == 0x80 &&
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(utf8[5] & 0xc0) == 0x80) {
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if ((((utf8[0] & 0x01L) << 30) |
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((utf8[0] & 0x3fL) << 24)) >= 0x04000000L) {
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++length;
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utf8 += 5;
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}
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}
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++utf8;
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}
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return length;
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}
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/*
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* NAME: utf8->size()
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* DESCRIPTION: return the encoding size of a utf8 string
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*/
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id3_length_t id3_utf8_size(id3_utf8_t const *utf8)
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{
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id3_utf8_t const *ptr = utf8;
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while (*ptr)
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++ptr;
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return ptr - utf8 + 1;
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}
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/*
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* NAME: utf8->ucs4duplicate()
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* DESCRIPTION: duplicate and decode a utf8 string into ucs4
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*/
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id3_ucs4_t *id3_utf8_ucs4duplicate(id3_utf8_t const *utf8)
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{
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id3_ucs4_t *ucs4;
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ucs4 = malloc((id3_utf8_length(utf8) + 1) * sizeof(*ucs4));
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if (ucs4)
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id3_utf8_decode(utf8, ucs4);
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return release(ucs4);
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}
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/*
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* NAME: utf8->decodechar()
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* DESCRIPTION: decode a series of utf8 chars into a single ucs4 char
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*/
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id3_length_t id3_utf8_decodechar(id3_utf8_t const *utf8, id3_ucs4_t *ucs4)
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{
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id3_utf8_t const *start = utf8;
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while (1) {
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if ((utf8[0] & 0x80) == 0x00) {
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*ucs4 = utf8[0];
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return utf8 - start + 1;
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}
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else if ((utf8[0] & 0xe0) == 0xc0 &&
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(utf8[1] & 0xc0) == 0x80) {
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*ucs4 =
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((utf8[0] & 0x1fL) << 6) |
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((utf8[1] & 0x3fL) << 0);
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if (*ucs4 >= 0x00000080L)
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return utf8 - start + 2;
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}
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else if ((utf8[0] & 0xf0) == 0xe0 &&
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(utf8[1] & 0xc0) == 0x80 &&
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(utf8[2] & 0xc0) == 0x80) {
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*ucs4 =
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((utf8[0] & 0x0fL) << 12) |
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((utf8[1] & 0x3fL) << 6) |
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((utf8[2] & 0x3fL) << 0);
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if (*ucs4 >= 0x00000800L)
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return utf8 - start + 3;
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}
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else if ((utf8[0] & 0xf8) == 0xf0 &&
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(utf8[1] & 0xc0) == 0x80 &&
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(utf8[2] & 0xc0) == 0x80 &&
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(utf8[3] & 0xc0) == 0x80) {
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*ucs4 =
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((utf8[0] & 0x07L) << 18) |
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((utf8[1] & 0x3fL) << 12) |
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((utf8[2] & 0x3fL) << 6) |
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((utf8[3] & 0x3fL) << 0);
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if (*ucs4 >= 0x00010000L)
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return utf8 - start + 4;
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}
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else if ((utf8[0] & 0xfc) == 0xf8 &&
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(utf8[1] & 0xc0) == 0x80 &&
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(utf8[2] & 0xc0) == 0x80 &&
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(utf8[3] & 0xc0) == 0x80 &&
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(utf8[4] & 0xc0) == 0x80) {
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*ucs4 =
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((utf8[0] & 0x03L) << 24) |
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((utf8[1] & 0x3fL) << 18) |
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((utf8[2] & 0x3fL) << 12) |
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((utf8[3] & 0x3fL) << 6) |
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((utf8[4] & 0x3fL) << 0);
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if (*ucs4 >= 0x00200000L)
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return utf8 - start + 5;
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}
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else if ((utf8[0] & 0xfe) == 0xfc &&
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(utf8[1] & 0xc0) == 0x80 &&
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(utf8[2] & 0xc0) == 0x80 &&
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(utf8[3] & 0xc0) == 0x80 &&
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(utf8[4] & 0xc0) == 0x80 &&
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(utf8[5] & 0xc0) == 0x80) {
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*ucs4 =
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((utf8[0] & 0x01L) << 30) |
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((utf8[1] & 0x3fL) << 24) |
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((utf8[2] & 0x3fL) << 18) |
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((utf8[3] & 0x3fL) << 12) |
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((utf8[4] & 0x3fL) << 6) |
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((utf8[5] & 0x3fL) << 0);
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if (*ucs4 >= 0x04000000L)
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return utf8 - start + 6;
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}
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++utf8;
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}
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}
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/*
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* NAME: utf8->encodechar()
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* DESCRIPTION: encode a single ucs4 char into a series of up to 6 utf8 chars
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*/
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id3_length_t id3_utf8_encodechar(id3_utf8_t *utf8, id3_ucs4_t ucs4)
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{
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if (ucs4 <= 0x0000007fL) {
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utf8[0] = ucs4;
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return 1;
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}
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else if (ucs4 <= 0x000007ffL) {
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utf8[0] = 0xc0 | ((ucs4 >> 6) & 0x1f);
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utf8[1] = 0x80 | ((ucs4 >> 0) & 0x3f);
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return 2;
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}
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else if (ucs4 <= 0x0000ffffL) {
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utf8[0] = 0xe0 | ((ucs4 >> 12) & 0x0f);
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utf8[1] = 0x80 | ((ucs4 >> 6) & 0x3f);
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utf8[2] = 0x80 | ((ucs4 >> 0) & 0x3f);
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return 3;
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}
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else if (ucs4 <= 0x001fffffL) {
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utf8[0] = 0xf0 | ((ucs4 >> 18) & 0x07);
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utf8[1] = 0x80 | ((ucs4 >> 12) & 0x3f);
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utf8[2] = 0x80 | ((ucs4 >> 6) & 0x3f);
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utf8[3] = 0x80 | ((ucs4 >> 0) & 0x3f);
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return 4;
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}
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else if (ucs4 <= 0x03ffffffL) {
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utf8[0] = 0xf8 | ((ucs4 >> 24) & 0x03);
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utf8[1] = 0x80 | ((ucs4 >> 18) & 0x3f);
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utf8[2] = 0x80 | ((ucs4 >> 12) & 0x3f);
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utf8[3] = 0x80 | ((ucs4 >> 6) & 0x3f);
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utf8[4] = 0x80 | ((ucs4 >> 0) & 0x3f);
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return 5;
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}
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else if (ucs4 <= 0x7fffffffL) {
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utf8[0] = 0xfc | ((ucs4 >> 30) & 0x01);
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utf8[1] = 0x80 | ((ucs4 >> 24) & 0x3f);
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utf8[2] = 0x80 | ((ucs4 >> 18) & 0x3f);
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utf8[3] = 0x80 | ((ucs4 >> 12) & 0x3f);
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utf8[4] = 0x80 | ((ucs4 >> 6) & 0x3f);
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utf8[5] = 0x80 | ((ucs4 >> 0) & 0x3f);
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return 6;
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}
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/* default */
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return id3_utf8_encodechar(utf8, ID3_UCS4_REPLACEMENTCHAR);
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}
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/*
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* NAME: utf8->decode()
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* DESCRIPTION: decode a complete utf8 string into a ucs4 string
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*/
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void id3_utf8_decode(id3_utf8_t const *utf8, id3_ucs4_t *ucs4)
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{
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do
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utf8 += id3_utf8_decodechar(utf8, ucs4);
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while (*ucs4++);
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}
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/*
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* NAME: utf8->encode()
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* DESCRIPTION: encode a complete ucs4 string into a utf8 string
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*/
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void id3_utf8_encode(id3_utf8_t *utf8, id3_ucs4_t const *ucs4)
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{
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do
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utf8 += id3_utf8_encodechar(utf8, *ucs4);
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while (*ucs4++);
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}
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/*
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* NAME: utf8->put()
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* DESCRIPTION: serialize a single utf8 character
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*/
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id3_length_t id3_utf8_put(id3_byte_t **ptr, id3_utf8_t utf8)
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{
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if (ptr)
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*(*ptr)++ = utf8;
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return 1;
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}
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/*
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* NAME: utf8->get()
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* DESCRIPTION: deserialize a single utf8 character
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*/
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id3_utf8_t id3_utf8_get(id3_byte_t const **ptr)
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{
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return *(*ptr)++;
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}
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/*
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* NAME: utf8->serialize()
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* DESCRIPTION: serialize a ucs4 string using utf8 encoding
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*/
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id3_length_t id3_utf8_serialize(id3_byte_t **ptr, id3_ucs4_t const *ucs4,
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int terminate)
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{
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id3_length_t size = 0;
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id3_utf8_t utf8[6], *out;
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while (*ucs4) {
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switch (id3_utf8_encodechar(out = utf8, *ucs4++)) {
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case 6: size += id3_utf8_put(ptr, *out++);
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case 5: size += id3_utf8_put(ptr, *out++);
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case 4: size += id3_utf8_put(ptr, *out++);
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case 3: size += id3_utf8_put(ptr, *out++);
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case 2: size += id3_utf8_put(ptr, *out++);
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case 1: size += id3_utf8_put(ptr, *out++);
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case 0: break;
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}
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}
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if (terminate)
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size += id3_utf8_put(ptr, 0);
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return size;
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}
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/*
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* NAME: utf8->deserialize()
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* DESCRIPTION: deserialize a ucs4 string using utf8 encoding
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*/
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id3_ucs4_t *id3_utf8_deserialize(id3_byte_t const **ptr, id3_length_t length)
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{
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id3_byte_t const *end;
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id3_utf8_t *utf8ptr, *utf8;
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id3_ucs4_t *ucs4;
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end = *ptr + length;
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utf8 = malloc((length + 1) * sizeof(*utf8));
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if (utf8 == 0)
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return 0;
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utf8ptr = utf8;
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while (end - *ptr > 0 && (*utf8ptr = id3_utf8_get(ptr)))
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++utf8ptr;
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*utf8ptr = 0;
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ucs4 = malloc((id3_utf8_length(utf8) + 1) * sizeof(*ucs4));
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if (ucs4)
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id3_utf8_decode(utf8, ucs4);
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free(utf8);
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return ucs4;
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}
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