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: field.c,v 1.16 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: # include <stdlib.h>
Chris@0: # include <string.h>
Chris@0: 
Chris@0: # ifdef HAVE_ASSERT_H
Chris@0: #  include <assert.h>
Chris@0: # endif
Chris@0: 
Chris@0: # include "id3tag.h"
Chris@0: # include "field.h"
Chris@0: # include "frame.h"
Chris@0: # include "render.h"
Chris@0: # include "ucs4.h"
Chris@0: # include "latin1.h"
Chris@0: # include "parse.h"
Chris@0: 
Chris@0: /*
Chris@0:  * NAME:	field->init()
Chris@0:  * DESCRIPTION:	initialize a field to a default value for the given type
Chris@0:  */
Chris@0: void id3_field_init(union id3_field *field, enum id3_field_type type)
Chris@0: {
Chris@0:   assert(field);
Chris@0: 
Chris@0:   switch (field->type = type) {
Chris@0:   case ID3_FIELD_TYPE_TEXTENCODING:
Chris@0:   case ID3_FIELD_TYPE_INT8:
Chris@0:   case ID3_FIELD_TYPE_INT16:
Chris@0:   case ID3_FIELD_TYPE_INT24:
Chris@0:   case ID3_FIELD_TYPE_INT32:
Chris@0:     field->number.value = 0;
Chris@0:     break;
Chris@0: 
Chris@0:   case ID3_FIELD_TYPE_LATIN1:
Chris@0:   case ID3_FIELD_TYPE_LATIN1FULL:
Chris@0:     field->latin1.ptr = 0;
Chris@0:     break;
Chris@0: 
Chris@0:   case ID3_FIELD_TYPE_LATIN1LIST:
Chris@0:     field->latin1list.nstrings = 0;
Chris@0:     field->latin1list.strings  = 0;
Chris@0: 
Chris@0:   case ID3_FIELD_TYPE_STRING:
Chris@0:   case ID3_FIELD_TYPE_STRINGFULL:
Chris@0:     field->string.ptr = 0;
Chris@0:     break;
Chris@0: 
Chris@0:   case ID3_FIELD_TYPE_STRINGLIST:
Chris@0:     field->stringlist.nstrings = 0;
Chris@0:     field->stringlist.strings  = 0;
Chris@0:     break;
Chris@0: 
Chris@0:   case ID3_FIELD_TYPE_LANGUAGE:
Chris@0:     strcpy(field->immediate.value, "XXX");
Chris@0:     break;
Chris@0: 
Chris@0:   case ID3_FIELD_TYPE_FRAMEID:
Chris@0:     strcpy(field->immediate.value, "XXXX");
Chris@0:     break;
Chris@0: 
Chris@0:   case ID3_FIELD_TYPE_DATE:
Chris@0:     memset(field->immediate.value, 0, sizeof(field->immediate.value));
Chris@0:     break;
Chris@0: 
Chris@0:   case ID3_FIELD_TYPE_INT32PLUS:
Chris@0:   case ID3_FIELD_TYPE_BINARYDATA:
Chris@0:     field->binary.data   = 0;
Chris@0:     field->binary.length = 0;
Chris@0:     break;
Chris@0:   }
Chris@0: }
Chris@0: 
Chris@0: /*
Chris@0:  * NAME:	field->finish()
Chris@0:  * DESCRIPTION:	reset a field, deallocating memory if necessary
Chris@0:  */
Chris@0: void id3_field_finish(union id3_field *field)
Chris@0: {
Chris@0:   unsigned int i;
Chris@0: 
Chris@0:   assert(field);
Chris@0: 
Chris@0:   switch (field->type) {
Chris@0:   case ID3_FIELD_TYPE_TEXTENCODING:
Chris@0:   case ID3_FIELD_TYPE_INT8:
Chris@0:   case ID3_FIELD_TYPE_INT16:
Chris@0:   case ID3_FIELD_TYPE_INT24:
Chris@0:   case ID3_FIELD_TYPE_INT32:
Chris@0:   case ID3_FIELD_TYPE_LANGUAGE:
Chris@0:   case ID3_FIELD_TYPE_FRAMEID:
Chris@0:   case ID3_FIELD_TYPE_DATE:
Chris@0:     break;
Chris@0: 
Chris@0:   case ID3_FIELD_TYPE_LATIN1:
Chris@0:   case ID3_FIELD_TYPE_LATIN1FULL:
Chris@0:     if (field->latin1.ptr)
Chris@0:       free(field->latin1.ptr);
Chris@0:     break;
Chris@0: 
Chris@0:   case ID3_FIELD_TYPE_LATIN1LIST:
Chris@0:     for (i = 0; i < field->latin1list.nstrings; ++i)
Chris@0:       free(field->latin1list.strings[i]);
Chris@0: 
Chris@0:     if (field->latin1list.strings)
Chris@0:       free(field->latin1list.strings);
Chris@0:     break;
Chris@0: 
Chris@0:   case ID3_FIELD_TYPE_STRING:
Chris@0:   case ID3_FIELD_TYPE_STRINGFULL:
Chris@0:     if (field->string.ptr)
Chris@0:       free(field->string.ptr);
Chris@0:     break;
Chris@0: 
Chris@0:   case ID3_FIELD_TYPE_STRINGLIST:
Chris@0:     for (i = 0; i < field->stringlist.nstrings; ++i)
Chris@0:       free(field->stringlist.strings[i]);
Chris@0: 
Chris@0:     if (field->stringlist.strings)
Chris@0:       free(field->stringlist.strings);
Chris@0:     break;
Chris@0: 
Chris@0:   case ID3_FIELD_TYPE_INT32PLUS:
Chris@0:   case ID3_FIELD_TYPE_BINARYDATA:
Chris@0:     if (field->binary.data)
Chris@0:       free(field->binary.data);
Chris@0:     break;
Chris@0:   }
Chris@0: 
Chris@0:   id3_field_init(field, field->type);
Chris@0: }
Chris@0: 
Chris@0: /*
Chris@0:  * NAME:	field->type()
Chris@0:  * DESCRIPTION:	return the value type of a field
Chris@0:  */
Chris@0: enum id3_field_type id3_field_type(union id3_field const *field)
Chris@0: {
Chris@0:   assert(field);
Chris@0: 
Chris@0:   return field->type;
Chris@0: }
Chris@0: 
Chris@0: /*
Chris@0:  * NAME:	field->parse()
Chris@0:  * DESCRIPTION:	parse a field value
Chris@0:  */
Chris@0: int id3_field_parse(union id3_field *field, id3_byte_t const **ptr,
Chris@0: 		    id3_length_t length, enum id3_field_textencoding *encoding)
Chris@0: {
Chris@0:   assert(field);
Chris@0: 
Chris@0:   id3_field_finish(field);
Chris@0: 
Chris@0:   switch (field->type) {
Chris@0:   case ID3_FIELD_TYPE_INT32:
Chris@0:     if (length < 4)
Chris@0:       goto fail;
Chris@0: 
Chris@0:     field->number.value = id3_parse_uint(ptr, 4);
Chris@0:     break;
Chris@0: 
Chris@0:   case ID3_FIELD_TYPE_INT24:
Chris@0:     if (length < 3)
Chris@0:       goto fail;
Chris@0: 
Chris@0:     field->number.value = id3_parse_uint(ptr, 3);
Chris@0:     break;
Chris@0: 
Chris@0:   case ID3_FIELD_TYPE_INT16:
Chris@0:     if (length < 2)
Chris@0:       goto fail;
Chris@0: 
Chris@0:     field->number.value = id3_parse_uint(ptr, 2);
Chris@0:     break;
Chris@0: 
Chris@0:   case ID3_FIELD_TYPE_INT8:
Chris@0:   case ID3_FIELD_TYPE_TEXTENCODING:
Chris@0:     if (length < 1)
Chris@0:       goto fail;
Chris@0: 
Chris@0:     field->number.value = id3_parse_uint(ptr, 1);
Chris@0: 
Chris@0:     if (field->type == ID3_FIELD_TYPE_TEXTENCODING)
Chris@0:       *encoding = field->number.value;
Chris@0:     break;
Chris@0: 
Chris@0:   case ID3_FIELD_TYPE_LANGUAGE:
Chris@0:     if (length < 3)
Chris@0:       goto fail;
Chris@0: 
Chris@0:     id3_parse_immediate(ptr, 3, field->immediate.value);
Chris@0:     break;
Chris@0: 
Chris@0:   case ID3_FIELD_TYPE_FRAMEID:
Chris@0:     if (length < 4)
Chris@0:       goto fail;
Chris@0: 
Chris@0:     id3_parse_immediate(ptr, 4, field->immediate.value);
Chris@0:     break;
Chris@0: 
Chris@0:   case ID3_FIELD_TYPE_DATE:
Chris@0:     if (length < 8)
Chris@0:       goto fail;
Chris@0: 
Chris@0:     id3_parse_immediate(ptr, 8, field->immediate.value);
Chris@0:     break;
Chris@0: 
Chris@0:   case ID3_FIELD_TYPE_LATIN1:
Chris@0:   case ID3_FIELD_TYPE_LATIN1FULL:
Chris@0:     {
Chris@0:       id3_latin1_t *latin1;
Chris@0: 
Chris@0:       latin1 = id3_parse_latin1(ptr, length,
Chris@0: 				field->type == ID3_FIELD_TYPE_LATIN1FULL);
Chris@0:       if (latin1 == 0)
Chris@0: 	goto fail;
Chris@0: 
Chris@0:       field->latin1.ptr = latin1;
Chris@0:     }
Chris@0:     break;
Chris@0: 
Chris@0:   case ID3_FIELD_TYPE_LATIN1LIST:
Chris@0:     {
Chris@0:       id3_byte_t const *end;
Chris@0:       id3_latin1_t *latin1, **strings;
Chris@0: 
Chris@0:       end = *ptr + length;
Chris@0: 
Chris@0:       while (end - *ptr > 0) {
Chris@0: 	latin1 = id3_parse_latin1(ptr, end - *ptr, 0);
Chris@0: 	if (latin1 == 0)
Chris@0: 	  goto fail;
Chris@0: 
Chris@0: 	strings = realloc(field->latin1list.strings,
Chris@0: 			  (field->latin1list.nstrings + 1) * sizeof(*strings));
Chris@0: 	if (strings == 0) {
Chris@0: 	  free(latin1);
Chris@0: 	  goto fail;
Chris@0: 	}
Chris@0: 
Chris@0: 	field->latin1list.strings = strings;
Chris@0: 	field->latin1list.strings[field->latin1list.nstrings++] = latin1;
Chris@0:       }
Chris@0:     }
Chris@0:     break;
Chris@0: 
Chris@0:   case ID3_FIELD_TYPE_STRING:
Chris@0:   case ID3_FIELD_TYPE_STRINGFULL:
Chris@0:     {
Chris@0:       id3_ucs4_t *ucs4;
Chris@0: 
Chris@0:       ucs4 = id3_parse_string(ptr, length, *encoding,
Chris@0: 			      field->type == ID3_FIELD_TYPE_STRINGFULL);
Chris@0:       if (ucs4 == 0)
Chris@0: 	goto fail;
Chris@0: 
Chris@0:       field->string.ptr = ucs4;
Chris@0:     }
Chris@0:     break;
Chris@0: 
Chris@0:   case ID3_FIELD_TYPE_STRINGLIST:
Chris@0:     {
Chris@0:       id3_byte_t const *end;
Chris@0:       id3_ucs4_t *ucs4, **strings;
Chris@0: 
Chris@0:       end = *ptr + length;
Chris@0: 
Chris@0:       while (end - *ptr > 0) {
Chris@0: 	ucs4 = id3_parse_string(ptr, end - *ptr, *encoding, 0);
Chris@0: 	if (ucs4 == 0)
Chris@0: 	  goto fail;
Chris@0: 
Chris@0: 	strings = realloc(field->stringlist.strings,
Chris@0: 			  (field->stringlist.nstrings + 1) * sizeof(*strings));
Chris@0: 	if (strings == 0) {
Chris@0: 	  free(ucs4);
Chris@0: 	  goto fail;
Chris@0: 	}
Chris@0: 
Chris@0: 	field->stringlist.strings = strings;
Chris@0: 	field->stringlist.strings[field->stringlist.nstrings++] = ucs4;
Chris@0:       }
Chris@0:     }
Chris@0:     break;
Chris@0: 
Chris@0:   case ID3_FIELD_TYPE_INT32PLUS:
Chris@0:   case ID3_FIELD_TYPE_BINARYDATA:
Chris@0:     {
Chris@0:       id3_byte_t *data;
Chris@0: 
Chris@0:       data = id3_parse_binary(ptr, length);
Chris@0:       if (data == 0)
Chris@0: 	goto fail;
Chris@0: 
Chris@0:       field->binary.data   = data;
Chris@0:       field->binary.length = length;
Chris@0:     }
Chris@0:     break;
Chris@0:   }
Chris@0: 
Chris@0:   return 0;
Chris@0: 
Chris@0:  fail:
Chris@0:   return -1;
Chris@0: }
Chris@0: 
Chris@0: /*
Chris@0:  * NAME:	field->render()
Chris@0:  * DESCRIPTION:	render a field value
Chris@0:  */
Chris@0: id3_length_t id3_field_render(union id3_field const *field, id3_byte_t **ptr,
Chris@0: 			      enum id3_field_textencoding *encoding,
Chris@0: 			      int terminate)
Chris@0: {
Chris@0:   id3_length_t size;
Chris@0:   unsigned int i;
Chris@0: 
Chris@0:   assert(field && encoding);
Chris@0: 
Chris@0:   switch (field->type) {
Chris@0:   case ID3_FIELD_TYPE_INT32:
Chris@0:     return id3_render_int(ptr, field->number.value, 4);
Chris@0: 
Chris@0:   case ID3_FIELD_TYPE_INT24:
Chris@0:     return id3_render_int(ptr, field->number.value, 3);
Chris@0: 
Chris@0:   case ID3_FIELD_TYPE_INT16:
Chris@0:     return id3_render_int(ptr, field->number.value, 2);
Chris@0: 
Chris@0:   case ID3_FIELD_TYPE_TEXTENCODING:
Chris@0:     *encoding = field->number.value;
Chris@0:   case ID3_FIELD_TYPE_INT8:
Chris@0:     return id3_render_int(ptr, field->number.value, 1);
Chris@0: 
Chris@0:   case ID3_FIELD_TYPE_LATIN1:
Chris@0:   case ID3_FIELD_TYPE_LATIN1FULL:
Chris@0:     return id3_render_latin1(ptr, field->latin1.ptr, terminate);
Chris@0: 
Chris@0:   case ID3_FIELD_TYPE_LATIN1LIST:
Chris@0:     size = 0;
Chris@0:     for (i = 0; i < field->latin1list.nstrings; ++i) {
Chris@0:       size += id3_render_latin1(ptr, field->latin1list.strings[i],
Chris@0: 				(i < field->latin1list.nstrings - 1) ||
Chris@0: 				terminate);
Chris@0:     }
Chris@0:     return size;
Chris@0: 
Chris@0:   case ID3_FIELD_TYPE_STRING:
Chris@0:   case ID3_FIELD_TYPE_STRINGFULL:
Chris@0:     return id3_render_string(ptr, field->string.ptr, *encoding, terminate);
Chris@0: 
Chris@0:   case ID3_FIELD_TYPE_STRINGLIST:
Chris@0:     size = 0;
Chris@0:     for (i = 0; i < field->stringlist.nstrings; ++i) {
Chris@0:       size += id3_render_string(ptr, field->stringlist.strings[i], *encoding,
Chris@0: 				(i < field->stringlist.nstrings - 1) ||
Chris@0: 				terminate);
Chris@0:     }
Chris@0:     return size;
Chris@0: 
Chris@0:   case ID3_FIELD_TYPE_LANGUAGE:
Chris@0:     return id3_render_immediate(ptr, field->immediate.value, 3);
Chris@0: 
Chris@0:   case ID3_FIELD_TYPE_FRAMEID:
Chris@0:     return id3_render_immediate(ptr, field->immediate.value, 4);
Chris@0: 
Chris@0:   case ID3_FIELD_TYPE_DATE:
Chris@0:     return id3_render_immediate(ptr, field->immediate.value, 8);
Chris@0: 
Chris@0:   case ID3_FIELD_TYPE_INT32PLUS:
Chris@0:   case ID3_FIELD_TYPE_BINARYDATA:
Chris@0:     return id3_render_binary(ptr, field->binary.data, field->binary.length);
Chris@0:   }
Chris@0: 
Chris@0:   return 0;
Chris@0: }
Chris@0: 
Chris@0: /*
Chris@0:  * NAME:	field->setint()
Chris@0:  * DESCRIPTION:	set the value of an int field
Chris@0:  */
Chris@0: int id3_field_setint(union id3_field *field, signed long number)
Chris@0: {
Chris@0:   assert(field);
Chris@0: 
Chris@0:   switch (field->type) {
Chris@0:   case ID3_FIELD_TYPE_INT8:
Chris@0:     if (number > 0x7f || number < -0x80)
Chris@0:       return -1;
Chris@0:     break;
Chris@0: 
Chris@0:   case ID3_FIELD_TYPE_INT16:
Chris@0:     if (number > 0x7fff || number < -0x8000)
Chris@0:       return -1;
Chris@0:     break;
Chris@0: 
Chris@0:   case ID3_FIELD_TYPE_INT24:
Chris@0:     if (number > 0x7fffffL || number < -0x800000L)
Chris@0:       return -1;
Chris@0:     break;
Chris@0: 
Chris@0:   case ID3_FIELD_TYPE_INT32:
Chris@0:     if (number > 0x7fffffffL || number < -0x80000000L)
Chris@0:       return -1;
Chris@0:     break;
Chris@0: 
Chris@0:   default:
Chris@0:     return -1;
Chris@0:   }
Chris@0: 
Chris@0:   id3_field_finish(field);
Chris@0: 
Chris@0:   field->number.value = number;
Chris@0: 
Chris@0:   return 0;
Chris@0: }
Chris@0: 
Chris@0: /*
Chris@0:  * NAME:	field->settextencoding()
Chris@0:  * DESCRIPTION:	set the value of a textencoding field
Chris@0:  */
Chris@0: int id3_field_settextencoding(union id3_field *field,
Chris@0: 			      enum id3_field_textencoding encoding)
Chris@0: {
Chris@0:   assert(field);
Chris@0: 
Chris@0:   if (field->type != ID3_FIELD_TYPE_TEXTENCODING)
Chris@0:     return -1;
Chris@0: 
Chris@0:   id3_field_finish(field);
Chris@0: 
Chris@0:   field->number.value = encoding;
Chris@0: 
Chris@0:   return 0;
Chris@0: }
Chris@0: 
Chris@0: static
Chris@0: int set_latin1(union id3_field *field, id3_latin1_t const *latin1)
Chris@0: {
Chris@0:   id3_latin1_t *data;
Chris@0: 
Chris@0:   if (latin1 == 0 || *latin1 == 0)
Chris@0:     data = 0;
Chris@0:   else {
Chris@0:     data = id3_latin1_duplicate(latin1);
Chris@0:     if (data == 0)
Chris@0:       return -1;
Chris@0:   }
Chris@0: 
Chris@0:   field->latin1.ptr = data;
Chris@0: 
Chris@0:   return 0;
Chris@0: }
Chris@0: 
Chris@0: /*
Chris@0:  * NAME:	field->setlatin1()
Chris@0:  * DESCRIPTION:	set the value of a latin1 field
Chris@0:  */
Chris@0: int id3_field_setlatin1(union id3_field *field, id3_latin1_t const *latin1)
Chris@0: {
Chris@0:   assert(field);
Chris@0: 
Chris@0:   if (field->type != ID3_FIELD_TYPE_LATIN1)
Chris@0:     return -1;
Chris@0: 
Chris@0:   id3_field_finish(field);
Chris@0: 
Chris@0:   if (latin1) {
Chris@0:     id3_latin1_t const *ptr;
Chris@0: 
Chris@0:     for (ptr = latin1; *ptr; ++ptr) {
Chris@0:       if (*ptr == '\n')
Chris@0: 	return -1;
Chris@0:     }
Chris@0:   }
Chris@0: 
Chris@0:   return set_latin1(field, latin1);
Chris@0: }
Chris@0: 
Chris@0: /*
Chris@0:  * NAME:	field->setfulllatin1()
Chris@0:  * DESCRIPTION:	set the value of a full latin1 field
Chris@0:  */
Chris@0: int id3_field_setfulllatin1(union id3_field *field, id3_latin1_t const *latin1)
Chris@0: {
Chris@0:   assert(field);
Chris@0: 
Chris@0:   if (field->type != ID3_FIELD_TYPE_LATIN1FULL)
Chris@0:     return -1;
Chris@0: 
Chris@0:   id3_field_finish(field);
Chris@0: 
Chris@0:   return set_latin1(field, latin1);
Chris@0: }
Chris@0: 
Chris@0: static
Chris@0: int set_string(union id3_field *field, id3_ucs4_t const *string)
Chris@0: {
Chris@0:   id3_ucs4_t *data;
Chris@0: 
Chris@0:   if (string == 0 || *string == 0)
Chris@0:     data = 0;
Chris@0:   else {
Chris@0:     data = id3_ucs4_duplicate(string);
Chris@0:     if (data == 0)
Chris@0:       return -1;
Chris@0:   }
Chris@0: 
Chris@0:   field->string.ptr = data;
Chris@0: 
Chris@0:   return 0;
Chris@0: }
Chris@0: 
Chris@0: /*
Chris@0:  * NAME:	field->setstring()
Chris@0:  * DESCRIPTION:	set the value of a string field
Chris@0:  */
Chris@0: int id3_field_setstring(union id3_field *field, id3_ucs4_t const *string)
Chris@0: {
Chris@0:   assert(field);
Chris@0: 
Chris@0:   if (field->type != ID3_FIELD_TYPE_STRING)
Chris@0:     return -1;
Chris@0: 
Chris@0:   id3_field_finish(field);
Chris@0: 
Chris@0:   if (string) {
Chris@0:     id3_ucs4_t const *ptr;
Chris@0: 
Chris@0:     for (ptr = string; *ptr; ++ptr) {
Chris@0:       if (*ptr == '\n')
Chris@0: 	return -1;
Chris@0:     }
Chris@0:   }
Chris@0: 
Chris@0:   return set_string(field, string);
Chris@0: }
Chris@0: 
Chris@0: /*
Chris@0:  * NAME:	field->setfullstring()
Chris@0:  * DESCRIPTION:	set the value of a full string field
Chris@0:  */
Chris@0: int id3_field_setfullstring(union id3_field *field, id3_ucs4_t const *string)
Chris@0: {
Chris@0:   assert(field);
Chris@0: 
Chris@0:   if (field->type != ID3_FIELD_TYPE_STRINGFULL)
Chris@0:     return -1;
Chris@0: 
Chris@0:   id3_field_finish(field);
Chris@0: 
Chris@0:   return set_string(field, string);
Chris@0: }
Chris@0: 
Chris@0: /*
Chris@0:  * NAME:	field->setstrings()
Chris@0:  * DESCRIPTION:	set the value of a stringlist field
Chris@0:  */
Chris@0: int id3_field_setstrings(union id3_field *field,
Chris@0: 			 unsigned int length, id3_ucs4_t **ptrs)
Chris@0: {
Chris@0:   id3_ucs4_t **strings;
Chris@0:   unsigned int i;
Chris@0: 
Chris@0:   assert(field);
Chris@0: 
Chris@0:   if (field->type != ID3_FIELD_TYPE_STRINGLIST)
Chris@0:     return -1;
Chris@0: 
Chris@0:   id3_field_finish(field);
Chris@0: 
Chris@0:   if (length == 0)
Chris@0:     return 0;
Chris@0: 
Chris@0:   strings = malloc(length * sizeof(*strings));
Chris@0:   if (strings == 0)
Chris@0:     return -1;
Chris@0: 
Chris@0:   for (i = 0; i < length; ++i) {
Chris@0:     strings[i] = id3_ucs4_duplicate(ptrs[i]);
Chris@0:     if (strings[i] == 0) {
Chris@0:       while (i--)
Chris@0: 	free(strings[i]);
Chris@0: 
Chris@0:       free(strings);
Chris@0:       return -1;
Chris@0:     }
Chris@0:   }
Chris@0: 
Chris@0:   field->stringlist.strings  = strings;
Chris@0:   field->stringlist.nstrings = length;
Chris@0: 
Chris@0:   return 0;
Chris@0: }
Chris@0: 
Chris@0: /*
Chris@0:  * NAME:	field->addstring()
Chris@0:  * DESCRIPTION:	add a string to a stringlist field
Chris@0:  */
Chris@0: int id3_field_addstring(union id3_field *field, id3_ucs4_t const *string)
Chris@0: {
Chris@0:   id3_ucs4_t *new, **strings;
Chris@0: 
Chris@0:   assert(field);
Chris@0: 
Chris@0:   if (field->type != ID3_FIELD_TYPE_STRINGLIST)
Chris@0:     return -1;
Chris@0: 
Chris@0:   if (string == 0)
Chris@0:     string = id3_ucs4_empty;
Chris@0: 
Chris@0:   new = id3_ucs4_duplicate(string);
Chris@0:   if (new == 0)
Chris@0:     return -1;
Chris@0: 
Chris@0:   strings = realloc(field->stringlist.strings,
Chris@0: 		    (field->stringlist.nstrings + 1) * sizeof(*strings));
Chris@0:   if (strings == 0) {
Chris@0:     free(new);
Chris@0:     return -1;
Chris@0:   }
Chris@0: 
Chris@0:   field->stringlist.strings = strings;
Chris@0:   field->stringlist.strings[field->stringlist.nstrings++] = new;
Chris@0: 
Chris@0:   return 0;
Chris@0: }
Chris@0: 
Chris@0: /*
Chris@0:  * NAME:	field->setlanguage()
Chris@0:  * DESCRIPTION:	set the value of a language field
Chris@0:  */
Chris@0: int id3_field_setlanguage(union id3_field *field, char const *language)
Chris@0: {
Chris@0:   assert(field);
Chris@0: 
Chris@0:   if (field->type != ID3_FIELD_TYPE_LANGUAGE)
Chris@0:     return -1;
Chris@0: 
Chris@0:   id3_field_finish(field);
Chris@0: 
Chris@0:   if (language) {
Chris@0:     if (strlen(language) != 3)
Chris@0:       return -1;
Chris@0: 
Chris@0:     strcpy(field->immediate.value, language);
Chris@0:   }
Chris@0: 
Chris@0:   return 0;
Chris@0: }
Chris@0: 
Chris@0: /*
Chris@0:  * NAME:	field->setframeid()
Chris@0:  * DESCRIPTION:	set the value of a frameid field
Chris@0:  */
Chris@0: int id3_field_setframeid(union id3_field *field, char const *id)
Chris@0: {
Chris@0:   assert(field);
Chris@0: 
Chris@0:   if (field->type != ID3_FIELD_TYPE_FRAMEID ||
Chris@0:       !id3_frame_validid(id))
Chris@0:     return -1;
Chris@0: 
Chris@0:   id3_field_finish(field);
Chris@0: 
Chris@0:   field->immediate.value[0] = id[0];
Chris@0:   field->immediate.value[1] = id[1];
Chris@0:   field->immediate.value[2] = id[2];
Chris@0:   field->immediate.value[3] = id[3];
Chris@0:   field->immediate.value[4] = 0;
Chris@0: 
Chris@0:   return 0;
Chris@0: }
Chris@0: 
Chris@0: /*
Chris@0:  * NAME:	field->setbinarydata()
Chris@0:  * DESCRIPTION:	set the value of a binarydata field
Chris@0:  */
Chris@0: int id3_field_setbinarydata(union id3_field *field,
Chris@0: 			    id3_byte_t const *data, id3_length_t length)
Chris@0: {
Chris@0:   id3_byte_t *mem;
Chris@0: 
Chris@0:   assert(field);
Chris@0: 
Chris@0:   if (field->type != ID3_FIELD_TYPE_BINARYDATA)
Chris@0:     return -1;
Chris@0: 
Chris@0:   id3_field_finish(field);
Chris@0: 
Chris@0:   if (length == 0)
Chris@0:     mem = 0;
Chris@0:   else {
Chris@0:     mem = malloc(length);
Chris@0:     if (mem == 0)
Chris@0:       return -1;
Chris@0: 
Chris@0:     assert(data);
Chris@0: 
Chris@0:     memcpy(mem, data, length);
Chris@0:   }
Chris@0: 
Chris@0:   field->binary.data   = mem;
Chris@0:   field->binary.length = length;
Chris@0: 
Chris@0:   return 0;
Chris@0: }
Chris@0: 
Chris@0: /*
Chris@0:  * NAME:	field->getint()
Chris@0:  * DESCRIPTION:	return the value of an integer field
Chris@0:  */
Chris@0: signed long id3_field_getint(union id3_field const *field)
Chris@0: {
Chris@0:   assert(field);
Chris@0: 
Chris@0:   if (field->type != ID3_FIELD_TYPE_INT8 &&
Chris@0:       field->type != ID3_FIELD_TYPE_INT16 &&
Chris@0:       field->type != ID3_FIELD_TYPE_INT24 &&
Chris@0:       field->type != ID3_FIELD_TYPE_INT32)
Chris@0:     return -1;
Chris@0: 
Chris@0:   return field->number.value;
Chris@0: }
Chris@0: 
Chris@0: /*
Chris@0:  * NAME:	field->gettextencoding()
Chris@0:  * DESCRIPTION:	return the value of a text encoding field
Chris@0:  */
Chris@0: enum id3_field_textencoding
Chris@0: id3_field_gettextencoding(union id3_field const *field)
Chris@0: {
Chris@0:   assert(field);
Chris@0: 
Chris@0:   if (field->type != ID3_FIELD_TYPE_TEXTENCODING)
Chris@0:     return -1;
Chris@0: 
Chris@0:   return field->number.value;
Chris@0: }
Chris@0: 
Chris@0: /*
Chris@0:  * NAME:	field->getlatin1()
Chris@0:  * DESCRIPTION:	return the value of a latin1 field
Chris@0:  */
Chris@0: id3_latin1_t const *id3_field_getlatin1(union id3_field const *field)
Chris@0: {
Chris@0:   assert(field);
Chris@0: 
Chris@0:   if (field->type != ID3_FIELD_TYPE_LATIN1)
Chris@0:     return 0;
Chris@0: 
Chris@0:   return field->latin1.ptr ? field->latin1.ptr : (id3_latin1_t const *) "";
Chris@0: }
Chris@0: 
Chris@0: /*
Chris@0:  * NAME:	field->getfulllatin1()
Chris@0:  * DESCRIPTION:	return the value of a full latin1 field
Chris@0:  */
Chris@0: id3_latin1_t const *id3_field_getfulllatin1(union id3_field const *field)
Chris@0: {
Chris@0:   assert(field);
Chris@0: 
Chris@0:   if (field->type != ID3_FIELD_TYPE_LATIN1FULL)
Chris@0:     return 0;
Chris@0: 
Chris@0:   return field->latin1.ptr ? field->latin1.ptr : (id3_latin1_t const *) "";
Chris@0: }
Chris@0: 
Chris@0: /*
Chris@0:  * NAME:	field->getstring()
Chris@0:  * DESCRIPTION:	return the value of a string field
Chris@0:  */
Chris@0: id3_ucs4_t const *id3_field_getstring(union id3_field const *field)
Chris@0: {
Chris@0:   assert(field);
Chris@0: 
Chris@0:   if (field->type != ID3_FIELD_TYPE_STRING)
Chris@0:     return 0;
Chris@0: 
Chris@0:   return field->string.ptr ? field->string.ptr : id3_ucs4_empty;
Chris@0: }
Chris@0: 
Chris@0: /*
Chris@0:  * NAME:	field->getfullstring()
Chris@0:  * DESCRIPTION:	return the value of a fullstring field
Chris@0:  */
Chris@0: id3_ucs4_t const *id3_field_getfullstring(union id3_field const *field)
Chris@0: {
Chris@0:   assert(field);
Chris@0: 
Chris@0:   if (field->type != ID3_FIELD_TYPE_STRINGFULL)
Chris@0:     return 0;
Chris@0: 
Chris@0:   return field->string.ptr ? field->string.ptr : id3_ucs4_empty;
Chris@0: }
Chris@0: 
Chris@0: /*
Chris@0:  * NAME:	field->getnstrings()
Chris@0:  * DESCRIPTION:	return the number of strings in a stringlist field
Chris@0:  */
Chris@0: unsigned int id3_field_getnstrings(union id3_field const *field)
Chris@0: {
Chris@0:   assert(field);
Chris@0: 
Chris@0:   if (field->type != ID3_FIELD_TYPE_STRINGLIST)
Chris@0:     return 0;
Chris@0: 
Chris@0:   return field->stringlist.nstrings;
Chris@0: }
Chris@0: 
Chris@0: /*
Chris@0:  * NAME:	field->getstrings()
Chris@0:  * DESCRIPTION:	return one value of a stringlist field
Chris@0:  */
Chris@0: id3_ucs4_t const *id3_field_getstrings(union id3_field const *field,
Chris@0: 				       unsigned int index)
Chris@0: {
Chris@0:   id3_ucs4_t const *string;
Chris@0: 
Chris@0:   assert(field);
Chris@0: 
Chris@0:   if (field->type != ID3_FIELD_TYPE_STRINGLIST ||
Chris@0:       index >= field->stringlist.nstrings)
Chris@0:     return 0;
Chris@0: 
Chris@0:   string = field->stringlist.strings[index];
Chris@0: 
Chris@0:   return string ? string : id3_ucs4_empty;
Chris@0: }
Chris@0: 
Chris@0: /*
Chris@0:  * NAME:	field->getframeid()
Chris@0:  * DESCRIPTION:	return the value of a frameid field
Chris@0:  */
Chris@0: char const *id3_field_getframeid(union id3_field const *field)
Chris@0: {
Chris@0:   assert(field);
Chris@0: 
Chris@0:   if (field->type != ID3_FIELD_TYPE_FRAMEID)
Chris@0:     return 0;
Chris@0: 
Chris@0:   return field->immediate.value;
Chris@0: }
Chris@0: 
Chris@0: /*
Chris@0:  * NAME:	field->getbinarydata()
Chris@0:  * DESCRIPTION:	return the value of a binarydata field
Chris@0:  */
Chris@0: id3_byte_t const *id3_field_getbinarydata(union id3_field const *field,
Chris@0: 					  id3_length_t *length)
Chris@0: {
Chris@0:   static id3_byte_t const empty;
Chris@0: 
Chris@0:   assert(field && length);
Chris@0: 
Chris@0:   if (field->type != ID3_FIELD_TYPE_BINARYDATA)
Chris@0:     return 0;
Chris@0: 
Chris@0:   assert(field->binary.length == 0 || field->binary.data);
Chris@0: 
Chris@0:   *length = field->binary.length;
Chris@0: 
Chris@0:   return field->binary.data ? field->binary.data : &empty;
Chris@0: }