/libtunepimp-0.5.3/plugins/mp3/id3tag/parse.c
C | 196 lines | 136 code | 40 blank | 20 comment | 32 complexity | 1693d24449c6567960c505b1252310ae MD5 | raw file
Possible License(s): LGPL-2.1, LGPL-3.0, GPL-2.0, LGPL-2.0
- /*
- * 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: parse.c 1373 2005-05-24 05:29:15Z robert $
- */
- # ifdef HAVE_CONFIG_H
- # include "config.h"
- # endif
- # include "global.h"
- # ifdef HAVE_ASSERT_H
- # include <assert.h>
- # endif
- # include <stdlib.h>
- # include <string.h>
- # include "id3tag.h"
- # include "parse.h"
- # include "latin1.h"
- # include "utf16.h"
- # include "utf8.h"
- signed long id3_parse_int(id3_byte_t const **ptr, unsigned int bytes)
- {
- signed long value = 0;
- assert(bytes >= 1 && bytes <= 4);
- if (**ptr & 0x80)
- value = ~0;
- switch (bytes) {
- case 4: value = (value << 8) | *(*ptr)++;
- case 3: value = (value << 8) | *(*ptr)++;
- case 2: value = (value << 8) | *(*ptr)++;
- case 1: value = (value << 8) | *(*ptr)++;
- }
- return value;
- }
- unsigned long id3_parse_uint(id3_byte_t const **ptr, unsigned int bytes)
- {
- unsigned long value = 0;
- assert(bytes >= 1 && bytes <= 4);
- switch (bytes) {
- case 4: value = (value << 8) | *(*ptr)++;
- case 3: value = (value << 8) | *(*ptr)++;
- case 2: value = (value << 8) | *(*ptr)++;
- case 1: value = (value << 8) | *(*ptr)++;
- }
- return value;
- }
- unsigned long id3_parse_syncsafe(id3_byte_t const **ptr, unsigned int bytes)
- {
- unsigned long value = 0;
- assert(bytes == 4 || bytes == 5);
- switch (bytes) {
- case 5: value = (value << 4) | (*(*ptr)++ & 0x0f);
- case 4: value = (value << 7) | (*(*ptr)++ & 0x7f);
- value = (value << 7) | (*(*ptr)++ & 0x7f);
- value = (value << 7) | (*(*ptr)++ & 0x7f);
- value = (value << 7) | (*(*ptr)++ & 0x7f);
- }
- return value;
- }
- void id3_parse_immediate(id3_byte_t const **ptr, unsigned int bytes,
- char *value)
- {
- assert(value);
- assert(bytes == 8 || bytes == 4 || bytes == 3);
- switch (bytes) {
- case 8: *value++ = *(*ptr)++;
- *value++ = *(*ptr)++;
- *value++ = *(*ptr)++;
- *value++ = *(*ptr)++;
- case 4: *value++ = *(*ptr)++;
- case 3: *value++ = *(*ptr)++;
- *value++ = *(*ptr)++;
- *value++ = *(*ptr)++;
- }
- *value = 0;
- }
- id3_latin1_t *id3_parse_latin1(id3_byte_t const **ptr, id3_length_t length,
- int full)
- {
- id3_byte_t const *end;
- int terminated = 0;
- id3_latin1_t *latin1;
- end = memchr(*ptr, 0, length);
- if (end == 0)
- end = *ptr + length;
- else {
- length = end - *ptr;
- terminated = 1;
- }
- latin1 = malloc(length + 1);
- if (latin1) {
- memcpy(latin1, *ptr, length);
- latin1[length] = 0;
- if (!full) {
- id3_latin1_t *check;
- for (check = latin1; *check; ++check) {
- if (*check == '\n')
- *check = ' ';
- }
- }
- }
- *ptr += length + terminated;
- return latin1;
- }
- id3_ucs4_t *id3_parse_string(id3_byte_t const **ptr, id3_length_t length,
- enum id3_field_textencoding encoding, int full)
- {
- id3_ucs4_t *ucs4 = 0;
- enum id3_utf16_byteorder byteorder = ID3_UTF16_BYTEORDER_ANY;
- switch (encoding) {
- case ID3_FIELD_TEXTENCODING_ISO_8859_1:
- ucs4 = id3_latin1_deserialize(ptr, length);
- break;
- case ID3_FIELD_TEXTENCODING_UTF_16BE:
- byteorder = ID3_UTF16_BYTEORDER_BE;
- case ID3_FIELD_TEXTENCODING_UTF_16:
- ucs4 = id3_utf16_deserialize(ptr, length, byteorder);
- break;
- case ID3_FIELD_TEXTENCODING_UTF_8:
- ucs4 = id3_utf8_deserialize(ptr, length);
- break;
- }
- if (ucs4 && !full) {
- id3_ucs4_t *check;
- for (check = ucs4; *check; ++check) {
- if (*check == '\n')
- *check = ' ';
- }
- }
- return ucs4;
- }
- id3_byte_t *id3_parse_binary(id3_byte_t const **ptr, id3_length_t length)
- {
- id3_byte_t *data;
- if (length == 0)
- return malloc(1);
- data = malloc(length);
- if (data)
- memcpy(data, *ptr, length);
- *ptr += length;
- return data;
- }