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 MATTHIAS 24 * RINGWALD 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 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 59 int avrcp_media_item_iterator_has_more(const avrcp_media_item_context_t * context){ 60 return context->offset < context->length; 61 } 62 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 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 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 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 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