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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: parse.c,v 1.9 2004/01/23 09:41:32 rob Exp $
*/
# 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;
}
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