1 /*
2 * Copyright (c) 2022, The OpenThread Authors.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. Neither the name of the copyright holder nor the
13 * names of its contributors may be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 /**
30 * @file
31 * This file implements the `FrameBuilder` class.
32 */
33
34 #include "frame_builder.hpp"
35
36 namespace ot {
37
Init(void * aBuffer,uint16_t aLength)38 void FrameBuilder::Init(void *aBuffer, uint16_t aLength)
39 {
40 mBuffer = static_cast<uint8_t *>(aBuffer);
41 mLength = 0;
42 mMaxLength = aLength;
43 }
44
AppendUint8(uint8_t aUint8)45 Error FrameBuilder::AppendUint8(uint8_t aUint8)
46 {
47 return Append<uint8_t>(aUint8);
48 }
49
AppendBigEndianUint16(uint16_t aUint16)50 Error FrameBuilder::AppendBigEndianUint16(uint16_t aUint16)
51 {
52 return Append<uint16_t>(Encoding::BigEndian::HostSwap16(aUint16));
53 }
54
AppendBigEndianUint32(uint32_t aUint32)55 Error FrameBuilder::AppendBigEndianUint32(uint32_t aUint32)
56 {
57 return Append<uint32_t>(Encoding::BigEndian::HostSwap32(aUint32));
58 }
59
AppendLittleEndianUint16(uint16_t aUint16)60 Error FrameBuilder::AppendLittleEndianUint16(uint16_t aUint16)
61 {
62 return Append<uint16_t>(Encoding::LittleEndian::HostSwap16(aUint16));
63 }
64
AppendLittleEndianUint32(uint32_t aUint32)65 Error FrameBuilder::AppendLittleEndianUint32(uint32_t aUint32)
66 {
67 return Append<uint32_t>(Encoding::LittleEndian::HostSwap32(aUint32));
68 }
69
AppendBytes(const void * aBuffer,uint16_t aLength)70 Error FrameBuilder::AppendBytes(const void *aBuffer, uint16_t aLength)
71 {
72 Error error = kErrorNone;
73
74 VerifyOrExit(CanAppend(aLength), error = kErrorNoBufs);
75 memcpy(mBuffer + mLength, aBuffer, aLength);
76 mLength += aLength;
77
78 exit:
79 return error;
80 }
81
AppendBytesFromMessage(const Message & aMessage,uint16_t aOffset,uint16_t aLength)82 Error FrameBuilder::AppendBytesFromMessage(const Message &aMessage, uint16_t aOffset, uint16_t aLength)
83 {
84 Error error = kErrorNone;
85
86 VerifyOrExit(CanAppend(aLength), error = kErrorNoBufs);
87 SuccessOrExit(error = aMessage.Read(aOffset, mBuffer + mLength, aLength));
88 mLength += aLength;
89
90 exit:
91 return error;
92 }
93
WriteBytes(uint16_t aOffset,const void * aBuffer,uint16_t aLength)94 void FrameBuilder::WriteBytes(uint16_t aOffset, const void *aBuffer, uint16_t aLength)
95 {
96 memcpy(mBuffer + aOffset, aBuffer, aLength);
97 }
98
99 } // namespace ot
100