1 /*
2 * Copyright (C) 2014 BlueKitchen GmbH
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the copyright holders nor the names of
14 * contributors may be used to endorse or promote products derived
15 * from this software without specific prior written permission.
16 * 4. Any redistribution, use, or modification is done solely for
17 * personal benefit and not for any commercial purpose or for
18 * monetary gain.
19 *
20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BLUEKITCHEN
24 * GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * Please inquire about commercial licensing options at
34 * [email protected]
35 *
36 */
37
38 #define BTSTACK_FILE__ "avrcp_media_item_iterator.c"
39
40
41 // *****************************************************************************
42 //
43 // AVRCP Media Item Iterator
44 //
45 // *****************************************************************************
46
47 #include <stdint.h>
48 #include <string.h>
49
50 #include "classic/avrcp_media_item_iterator.h"
51 #include "btstack_util.h"
52
avrcp_media_item_iterator_init(avrcp_media_item_context_t * context,uint16_t avrcp_media_item_len,const uint8_t * avrcp_media_item_data)53 void avrcp_media_item_iterator_init(avrcp_media_item_context_t *context, uint16_t avrcp_media_item_len, const uint8_t * avrcp_media_item_data){
54 context->data = avrcp_media_item_data;
55 context->length = avrcp_media_item_len;
56 context->offset = 0;
57 }
58
avrcp_media_item_iterator_has_more(const avrcp_media_item_context_t * context)59 int avrcp_media_item_iterator_has_more(const avrcp_media_item_context_t * context){
60 return context->offset < context->length;
61 }
62
avrcp_media_item_iterator_next(avrcp_media_item_context_t * context)63 void avrcp_media_item_iterator_next(avrcp_media_item_context_t * context){
64 int chunk_len = big_endian_read_16(context->data, context->offset + 6);
65 int new_offset = context->offset + 2 + 2 + 4 + chunk_len;
66 // avoid uint8_t overrun
67 if (new_offset > 0xffff){
68 new_offset = 0xffff;
69 }
70 context->offset = new_offset;
71 }
72
avrcp_media_item_iterator_get_attr_id(const avrcp_media_item_context_t * context)73 uint32_t avrcp_media_item_iterator_get_attr_id(const avrcp_media_item_context_t * context){
74 return big_endian_read_32(context->data, context->offset);
75 }
76
avrcp_media_item_iterator_get_attr_charset(const avrcp_media_item_context_t * context)77 uint16_t avrcp_media_item_iterator_get_attr_charset(const avrcp_media_item_context_t * context){
78 return big_endian_read_16(context->data, context->offset + 4);
79 }
80
avrcp_media_item_iterator_get_attr_value_len(const avrcp_media_item_context_t * context)81 uint16_t avrcp_media_item_iterator_get_attr_value_len(const avrcp_media_item_context_t * context){
82 return big_endian_read_16(context->data, context->offset + 6);
83 }
84
avrcp_media_item_iterator_get_attr_value(const avrcp_media_item_context_t * context)85 const uint8_t * avrcp_media_item_iterator_get_attr_value(const avrcp_media_item_context_t * context){
86 return &context->data[context->offset + 8];
87 }
88
89