|
1 // Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies). |
|
2 // All rights reserved. |
|
3 // This component and the accompanying materials are made available |
|
4 // under the terms of "Eclipse Public License v1.0" |
|
5 // which accompanies this distribution, and is available |
|
6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
|
7 // |
|
8 // Initial Contributors: |
|
9 // Nokia Corporation - initial contribution. |
|
10 // |
|
11 // Contributors: |
|
12 // |
|
13 // Description: |
|
14 // |
|
15 |
|
16 #include "browsingframe.h" |
|
17 |
|
18 |
|
19 /** Verifies the length of a frame is correct. Checking: |
|
20 1) Header is present |
|
21 2) Data length indicated is present |
|
22 |
|
23 This does not semantically check that the data expected for |
|
24 the PDU ID is present. |
|
25 |
|
26 @param aFrame The frame to verify |
|
27 @leave KErrCorrupt if the length of the frame is incorrect |
|
28 */ |
|
29 void AvrcpBrowsing::BrowsingFrame::VerifyFrameL(const TDesC8& aFrame) |
|
30 { |
|
31 if((aFrame.Length() < AvrcpBrowsing::KHeaderLength) || |
|
32 (aFrame.Length() < (AvrcpBrowsing::KHeaderLength + ParamLength(aFrame)))) |
|
33 { |
|
34 User::Leave(KErrCorrupt); |
|
35 } |
|
36 } |
|
37 |
|
38 |
|
39 /** Retreives the PDU ID from this frame. |
|
40 |
|
41 @pre The integrity of the frame must have been verified (@see |
|
42 BrowsingFrame::VerifyFrameL) as the length is not checked |
|
43 before retrieving the PDU ID. |
|
44 @param aFrame The frame to retrieve the PDU ID for. |
|
45 @return The PDU ID of aFrame |
|
46 */ |
|
47 AvrcpBrowsing::TPduId AvrcpBrowsing::BrowsingFrame::PduId(const TDesC8& aFrame) |
|
48 { |
|
49 return aFrame[0]; |
|
50 } |
|
51 |
|
52 /** Retreives the parameter length from this frame. |
|
53 |
|
54 @pre The integrity of the frame must have been verified (@see |
|
55 BrowsingFrame::VerifyFrameL) as the length is not checked |
|
56 before retrieving the parameter length. |
|
57 @param aFrame The frame to retrieve the parameter length for. |
|
58 @return The parameter length of aFrame |
|
59 */ |
|
60 TInt AvrcpBrowsing::BrowsingFrame::ParamLength(const TDesC8& aFrame) |
|
61 { |
|
62 TInt paramLength = 0; |
|
63 paramLength += aFrame[2]; |
|
64 paramLength += ((TUint)aFrame[1]) << 8; |
|
65 |
|
66 return paramLength; |
|
67 } |
|
68 |
|
69 /** Retreives the payload from this frame. |
|
70 |
|
71 @pre The integrity of the frame must have been verified (@see |
|
72 BrowsingFrame::VerifyFrameL) as the length is not checked |
|
73 before retrieving the payload. |
|
74 @param aFrame The frame to retrieve the payload for. |
|
75 @param aPayload On return the payload of aFrame |
|
76 */ |
|
77 void AvrcpBrowsing::BrowsingFrame::Payload(const TDesC8& aFrame, TPtrC8& aPayload) |
|
78 { |
|
79 aPayload.Set(aFrame.Mid(AvrcpBrowsing::KHeaderLength, AvrcpBrowsing::BrowsingFrame::ParamLength(aFrame))); |
|
80 } |
|
81 |