cannam@85: /*
cannam@85:  * libid3tag - ID3 tag manipulation library
cannam@85:  * Copyright (C) 2000-2004 Underbit Technologies, Inc.
cannam@85:  *
cannam@85:  * This program is free software; you can redistribute it and/or modify
cannam@85:  * it under the terms of the GNU General Public License as published by
cannam@85:  * the Free Software Foundation; either version 2 of the License, or
cannam@85:  * (at your option) any later version.
cannam@85:  *
cannam@85:  * This program is distributed in the hope that it will be useful,
cannam@85:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
cannam@85:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
cannam@85:  * GNU General Public License for more details.
cannam@85:  *
cannam@85:  * You should have received a copy of the GNU General Public License
cannam@85:  * along with this program; if not, write to the Free Software
cannam@85:  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
cannam@85:  *
cannam@85:  * $Id: parse.c,v 1.9 2004/01/23 09:41:32 rob Exp $
cannam@85:  */
cannam@85: 
cannam@85: # ifdef HAVE_CONFIG_H
cannam@85: #  include "config.h"
cannam@85: # endif
cannam@85: 
cannam@85: # include "global.h"
cannam@85: 
cannam@85: # ifdef HAVE_ASSERT_H
cannam@85: #  include <assert.h>
cannam@85: # endif
cannam@85: 
cannam@85: # include <stdlib.h>
cannam@85: # include <string.h>
cannam@85: 
cannam@85: # include "id3tag.h"
cannam@85: # include "parse.h"
cannam@85: # include "latin1.h"
cannam@85: # include "utf16.h"
cannam@85: # include "utf8.h"
cannam@85: 
cannam@85: signed long id3_parse_int(id3_byte_t const **ptr, unsigned int bytes)
cannam@85: {
cannam@85:   signed long value = 0;
cannam@85: 
cannam@85:   assert(bytes >= 1 && bytes <= 4);
cannam@85: 
cannam@85:   if (**ptr & 0x80)
cannam@85:     value = ~0;
cannam@85: 
cannam@85:   switch (bytes) {
cannam@85:   case 4: value = (value << 8) | *(*ptr)++;
cannam@85:   case 3: value = (value << 8) | *(*ptr)++;
cannam@85:   case 2: value = (value << 8) | *(*ptr)++;
cannam@85:   case 1: value = (value << 8) | *(*ptr)++;
cannam@85:   }
cannam@85: 
cannam@85:   return value;
cannam@85: }
cannam@85: 
cannam@85: unsigned long id3_parse_uint(id3_byte_t const **ptr, unsigned int bytes)
cannam@85: {
cannam@85:   unsigned long value = 0;
cannam@85: 
cannam@85:   assert(bytes >= 1 && bytes <= 4);
cannam@85: 
cannam@85:   switch (bytes) {
cannam@85:   case 4: value = (value << 8) | *(*ptr)++;
cannam@85:   case 3: value = (value << 8) | *(*ptr)++;
cannam@85:   case 2: value = (value << 8) | *(*ptr)++;
cannam@85:   case 1: value = (value << 8) | *(*ptr)++;
cannam@85:   }
cannam@85: 
cannam@85:   return value;
cannam@85: }
cannam@85: 
cannam@85: unsigned long id3_parse_syncsafe(id3_byte_t const **ptr, unsigned int bytes)
cannam@85: {
cannam@85:   unsigned long value = 0;
cannam@85: 
cannam@85:   assert(bytes == 4 || bytes == 5);
cannam@85: 
cannam@85:   switch (bytes) {
cannam@85:   case 5: value = (value << 4) | (*(*ptr)++ & 0x0f);
cannam@85:   case 4: value = (value << 7) | (*(*ptr)++ & 0x7f);
cannam@85:           value = (value << 7) | (*(*ptr)++ & 0x7f);
cannam@85: 	  value = (value << 7) | (*(*ptr)++ & 0x7f);
cannam@85: 	  value = (value << 7) | (*(*ptr)++ & 0x7f);
cannam@85:   }
cannam@85: 
cannam@85:   return value;
cannam@85: }
cannam@85: 
cannam@85: void id3_parse_immediate(id3_byte_t const **ptr, unsigned int bytes,
cannam@85: 			 char *value)
cannam@85: {
cannam@85:   assert(value);
cannam@85:   assert(bytes == 8 || bytes == 4 || bytes == 3);
cannam@85: 
cannam@85:   switch (bytes) {
cannam@85:   case 8: *value++ = *(*ptr)++;
cannam@85:           *value++ = *(*ptr)++;
cannam@85: 	  *value++ = *(*ptr)++;
cannam@85: 	  *value++ = *(*ptr)++;
cannam@85:   case 4: *value++ = *(*ptr)++;
cannam@85:   case 3: *value++ = *(*ptr)++;
cannam@85:           *value++ = *(*ptr)++;
cannam@85: 	  *value++ = *(*ptr)++;
cannam@85:   }
cannam@85: 
cannam@85:   *value = 0;
cannam@85: }
cannam@85: 
cannam@85: id3_latin1_t *id3_parse_latin1(id3_byte_t const **ptr, id3_length_t length,
cannam@85: 			       int full)
cannam@85: {
cannam@85:   id3_byte_t const *end;
cannam@85:   int terminated = 0;
cannam@85:   id3_latin1_t *latin1;
cannam@85: 
cannam@85:   end = memchr(*ptr, 0, length);
cannam@85:   if (end == 0)
cannam@85:     end = *ptr + length;
cannam@85:   else {
cannam@85:     length = end - *ptr;
cannam@85:     terminated = 1;
cannam@85:   }
cannam@85: 
cannam@85:   latin1 = malloc(length + 1);
cannam@85:   if (latin1) {
cannam@85:     memcpy(latin1, *ptr, length);
cannam@85:     latin1[length] = 0;
cannam@85: 
cannam@85:     if (!full) {
cannam@85:       id3_latin1_t *check;
cannam@85: 
cannam@85:       for (check = latin1; *check; ++check) {
cannam@85: 	if (*check == '\n')
cannam@85: 	  *check = ' ';
cannam@85:       }
cannam@85:     }
cannam@85:   }
cannam@85: 
cannam@85:   *ptr += length + terminated;
cannam@85: 
cannam@85:   return latin1;
cannam@85: }
cannam@85: 
cannam@85: id3_ucs4_t *id3_parse_string(id3_byte_t const **ptr, id3_length_t length,
cannam@85: 			     enum id3_field_textencoding encoding, int full)
cannam@85: {
cannam@85:   id3_ucs4_t *ucs4 = 0;
cannam@85:   enum id3_utf16_byteorder byteorder = ID3_UTF16_BYTEORDER_ANY;
cannam@85: 
cannam@85:   switch (encoding) {
cannam@85:   case ID3_FIELD_TEXTENCODING_ISO_8859_1:
cannam@85:     ucs4 = id3_latin1_deserialize(ptr, length);
cannam@85:     break;
cannam@85: 
cannam@85:   case ID3_FIELD_TEXTENCODING_UTF_16BE:
cannam@85:     byteorder = ID3_UTF16_BYTEORDER_BE;
cannam@85:   case ID3_FIELD_TEXTENCODING_UTF_16:
cannam@85:     ucs4 = id3_utf16_deserialize(ptr, length, byteorder);
cannam@85:     break;
cannam@85: 
cannam@85:   case ID3_FIELD_TEXTENCODING_UTF_8:
cannam@85:     ucs4 = id3_utf8_deserialize(ptr, length);
cannam@85:     break;
cannam@85:   }
cannam@85: 
cannam@85:   if (ucs4 && !full) {
cannam@85:     id3_ucs4_t *check;
cannam@85: 
cannam@85:     for (check = ucs4; *check; ++check) {
cannam@85:       if (*check == '\n')
cannam@85: 	*check = ' ';
cannam@85:     }
cannam@85:   }
cannam@85: 
cannam@85:   return ucs4;
cannam@85: }
cannam@85: 
cannam@85: id3_byte_t *id3_parse_binary(id3_byte_t const **ptr, id3_length_t length)
cannam@85: {
cannam@85:   id3_byte_t *data;
cannam@85: 
cannam@85:   if (length == 0)
cannam@85:     return malloc(1);
cannam@85: 
cannam@85:   data = malloc(length);
cannam@85:   if (data)
cannam@85:     memcpy(data, *ptr, length);
cannam@85: 
cannam@85:   *ptr += length;
cannam@85: 
cannam@85:   return data;
cannam@85: }