Chris@0: /*
Chris@0:  * libid3tag - ID3 tag manipulation library
Chris@0:  * Copyright (C) 2000-2004 Underbit Technologies, Inc.
Chris@0:  *
Chris@0:  * This program is free software; you can redistribute it and/or modify
Chris@0:  * it under the terms of the GNU General Public License as published by
Chris@0:  * the Free Software Foundation; either version 2 of the License, or
Chris@0:  * (at your option) any later version.
Chris@0:  *
Chris@0:  * This program is distributed in the hope that it will be useful,
Chris@0:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
Chris@0:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
Chris@0:  * GNU General Public License for more details.
Chris@0:  *
Chris@0:  * You should have received a copy of the GNU General Public License
Chris@0:  * along with this program; if not, write to the Free Software
Chris@0:  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
Chris@0:  *
Chris@0:  * $Id: parse.c,v 1.9 2004/01/23 09:41:32 rob Exp $
Chris@0:  */
Chris@0: 
Chris@0: # ifdef HAVE_CONFIG_H
Chris@0: #  include "config.h"
Chris@0: # endif
Chris@0: 
Chris@0: # include "global.h"
Chris@0: 
Chris@0: # ifdef HAVE_ASSERT_H
Chris@0: #  include <assert.h>
Chris@0: # endif
Chris@0: 
Chris@0: # include <stdlib.h>
Chris@0: # include <string.h>
Chris@0: 
Chris@0: # include "id3tag.h"
Chris@0: # include "parse.h"
Chris@0: # include "latin1.h"
Chris@0: # include "utf16.h"
Chris@0: # include "utf8.h"
Chris@0: 
Chris@0: signed long id3_parse_int(id3_byte_t const **ptr, unsigned int bytes)
Chris@0: {
Chris@0:   signed long value = 0;
Chris@0: 
Chris@0:   assert(bytes >= 1 && bytes <= 4);
Chris@0: 
Chris@0:   if (**ptr & 0x80)
Chris@0:     value = ~0;
Chris@0: 
Chris@0:   switch (bytes) {
Chris@0:   case 4: value = (value << 8) | *(*ptr)++;
Chris@0:   case 3: value = (value << 8) | *(*ptr)++;
Chris@0:   case 2: value = (value << 8) | *(*ptr)++;
Chris@0:   case 1: value = (value << 8) | *(*ptr)++;
Chris@0:   }
Chris@0: 
Chris@0:   return value;
Chris@0: }
Chris@0: 
Chris@0: unsigned long id3_parse_uint(id3_byte_t const **ptr, unsigned int bytes)
Chris@0: {
Chris@0:   unsigned long value = 0;
Chris@0: 
Chris@0:   assert(bytes >= 1 && bytes <= 4);
Chris@0: 
Chris@0:   switch (bytes) {
Chris@0:   case 4: value = (value << 8) | *(*ptr)++;
Chris@0:   case 3: value = (value << 8) | *(*ptr)++;
Chris@0:   case 2: value = (value << 8) | *(*ptr)++;
Chris@0:   case 1: value = (value << 8) | *(*ptr)++;
Chris@0:   }
Chris@0: 
Chris@0:   return value;
Chris@0: }
Chris@0: 
Chris@0: unsigned long id3_parse_syncsafe(id3_byte_t const **ptr, unsigned int bytes)
Chris@0: {
Chris@0:   unsigned long value = 0;
Chris@0: 
Chris@0:   assert(bytes == 4 || bytes == 5);
Chris@0: 
Chris@0:   switch (bytes) {
Chris@0:   case 5: value = (value << 4) | (*(*ptr)++ & 0x0f);
Chris@0:   case 4: value = (value << 7) | (*(*ptr)++ & 0x7f);
Chris@0:           value = (value << 7) | (*(*ptr)++ & 0x7f);
Chris@0: 	  value = (value << 7) | (*(*ptr)++ & 0x7f);
Chris@0: 	  value = (value << 7) | (*(*ptr)++ & 0x7f);
Chris@0:   }
Chris@0: 
Chris@0:   return value;
Chris@0: }
Chris@0: 
Chris@0: void id3_parse_immediate(id3_byte_t const **ptr, unsigned int bytes,
Chris@0: 			 char *value)
Chris@0: {
Chris@0:   assert(value);
Chris@0:   assert(bytes == 8 || bytes == 4 || bytes == 3);
Chris@0: 
Chris@0:   switch (bytes) {
Chris@0:   case 8: *value++ = *(*ptr)++;
Chris@0:           *value++ = *(*ptr)++;
Chris@0: 	  *value++ = *(*ptr)++;
Chris@0: 	  *value++ = *(*ptr)++;
Chris@0:   case 4: *value++ = *(*ptr)++;
Chris@0:   case 3: *value++ = *(*ptr)++;
Chris@0:           *value++ = *(*ptr)++;
Chris@0: 	  *value++ = *(*ptr)++;
Chris@0:   }
Chris@0: 
Chris@0:   *value = 0;
Chris@0: }
Chris@0: 
Chris@0: id3_latin1_t *id3_parse_latin1(id3_byte_t const **ptr, id3_length_t length,
Chris@0: 			       int full)
Chris@0: {
Chris@0:   id3_byte_t const *end;
Chris@0:   int terminated = 0;
Chris@0:   id3_latin1_t *latin1;
Chris@0: 
Chris@0:   end = memchr(*ptr, 0, length);
Chris@0:   if (end == 0)
Chris@0:     end = *ptr + length;
Chris@0:   else {
Chris@0:     length = end - *ptr;
Chris@0:     terminated = 1;
Chris@0:   }
Chris@0: 
Chris@0:   latin1 = malloc(length + 1);
Chris@0:   if (latin1) {
Chris@0:     memcpy(latin1, *ptr, length);
Chris@0:     latin1[length] = 0;
Chris@0: 
Chris@0:     if (!full) {
Chris@0:       id3_latin1_t *check;
Chris@0: 
Chris@0:       for (check = latin1; *check; ++check) {
Chris@0: 	if (*check == '\n')
Chris@0: 	  *check = ' ';
Chris@0:       }
Chris@0:     }
Chris@0:   }
Chris@0: 
Chris@0:   *ptr += length + terminated;
Chris@0: 
Chris@0:   return latin1;
Chris@0: }
Chris@0: 
Chris@0: id3_ucs4_t *id3_parse_string(id3_byte_t const **ptr, id3_length_t length,
Chris@0: 			     enum id3_field_textencoding encoding, int full)
Chris@0: {
Chris@0:   id3_ucs4_t *ucs4 = 0;
Chris@0:   enum id3_utf16_byteorder byteorder = ID3_UTF16_BYTEORDER_ANY;
Chris@0: 
Chris@0:   switch (encoding) {
Chris@0:   case ID3_FIELD_TEXTENCODING_ISO_8859_1:
Chris@0:     ucs4 = id3_latin1_deserialize(ptr, length);
Chris@0:     break;
Chris@0: 
Chris@0:   case ID3_FIELD_TEXTENCODING_UTF_16BE:
Chris@0:     byteorder = ID3_UTF16_BYTEORDER_BE;
Chris@0:   case ID3_FIELD_TEXTENCODING_UTF_16:
Chris@0:     ucs4 = id3_utf16_deserialize(ptr, length, byteorder);
Chris@0:     break;
Chris@0: 
Chris@0:   case ID3_FIELD_TEXTENCODING_UTF_8:
Chris@0:     ucs4 = id3_utf8_deserialize(ptr, length);
Chris@0:     break;
Chris@0:   }
Chris@0: 
Chris@0:   if (ucs4 && !full) {
Chris@0:     id3_ucs4_t *check;
Chris@0: 
Chris@0:     for (check = ucs4; *check; ++check) {
Chris@0:       if (*check == '\n')
Chris@0: 	*check = ' ';
Chris@0:     }
Chris@0:   }
Chris@0: 
Chris@0:   return ucs4;
Chris@0: }
Chris@0: 
Chris@0: id3_byte_t *id3_parse_binary(id3_byte_t const **ptr, id3_length_t length)
Chris@0: {
Chris@0:   id3_byte_t *data;
Chris@0: 
Chris@0:   if (length == 0)
Chris@0:     return malloc(1);
Chris@0: 
Chris@0:   data = malloc(length);
Chris@0:   if (data)
Chris@0:     memcpy(data, *ptr, length);
Chris@0: 
Chris@0:   *ptr += length;
Chris@0: 
Chris@0:   return data;
Chris@0: }