author | jjkang |
Fri, 11 Jun 2010 15:22:09 +0800 | |
changeset 2 | 806186ab5e14 |
parent 1 | 0a7b44b10206 |
permissions | -rw-r--r-- |
1
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
1 |
// Copyright (c) 1998-2009 Nokia Corporation and/or its subsidiary(-ies). |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
2 |
// All rights reserved. |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
3 |
// This component and the accompanying materials are made available |
2 | 4 |
// under the terms of the License "Eclipse Public License v1.0" |
1
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
5 |
// which accompanies this distribution, and is available |
2 | 6 |
// at the URL "http://www.eclipse.org/legal/epl-v10.html". |
1
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
7 |
// |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
8 |
// Initial Contributors: |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
9 |
// Nokia Corporation - initial contribution. |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
10 |
// |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
11 |
// Contributors: |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
12 |
// |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
13 |
// Description: |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
14 |
// e32\euser\us_decode.cpp |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
15 |
// |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
16 |
// |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
17 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
18 |
#include <e32huffman.h> |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
19 |
#include <e32base.h> |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
20 |
#include <e32panic.h> |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
21 |
#include <cpudefs.h> |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
22 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
23 |
const TInt KHuffTerminate=0x0001; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
24 |
const TUint32 KBranch1=sizeof(TUint32)<<16; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
25 |
_LIT(KCat,"Huffman"); |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
26 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
27 |
TUint32* HuffmanSubTree(TUint32* aPtr,const TUint32* aValue,TUint32** aLevel) |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
28 |
// |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
29 |
// write the subtree below aPtr and return the head |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
30 |
// |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
31 |
{ |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
32 |
TUint32* l=*aLevel++; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
33 |
if (l>aValue) |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
34 |
{ |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
35 |
TUint32* sub0=HuffmanSubTree(aPtr,aValue,aLevel); // 0-tree first |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
36 |
aPtr=HuffmanSubTree(sub0,aValue-(aPtr-sub0)-1,aLevel); // 1-tree |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
37 |
TInt branch0=(TUint8*)sub0-(TUint8*)(aPtr-1); |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
38 |
*--aPtr=KBranch1|branch0; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
39 |
} |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
40 |
else if (l==aValue) |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
41 |
{ |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
42 |
TUint term0=*aValue--; // 0-term |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
43 |
aPtr=HuffmanSubTree(aPtr,aValue,aLevel); // 1-tree |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
44 |
*--aPtr=KBranch1|(term0>>16); |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
45 |
} |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
46 |
else // l<iNext |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
47 |
{ |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
48 |
TUint term0=*aValue--; // 0-term |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
49 |
TUint term1=*aValue--; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
50 |
*--aPtr=(term1>>16<<16)|(term0>>16); |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
51 |
} |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
52 |
return aPtr; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
53 |
} |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
54 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
55 |
/** Create a canonical Huffman decoding tree |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
56 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
57 |
This generates the huffman decoding tree used by TBitInput::HuffmanL() to read huffman |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
58 |
encoded data. The input is table of code lengths, as generated by Huffman::HuffmanL() |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
59 |
and must represent a valid huffman code. |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
60 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
61 |
@param aHuffman The table of code lengths as generated by Huffman::HuffmanL() |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
62 |
@param aNumCodes The number of codes in the table |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
63 |
@param aDecodeTree The space for the decoding tree. This must be the same |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
64 |
size as the code-length table, and can safely be the same memory |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
65 |
@param aSymbolBase the base value for the output 'symbols' from the decoding tree, by default |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
66 |
this is zero. |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
67 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
68 |
@panic "USER ???" If the provided code is not a valid Huffman coding |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
69 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
70 |
@see IsValid() |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
71 |
@see HuffmanL() |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
72 |
*/ |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
73 |
EXPORT_C void Huffman::Decoding(const TUint32 aHuffman[],TInt aNumCodes,TUint32 aDecodeTree[],TInt aSymbolBase) |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
74 |
{ |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
75 |
__ASSERT_ALWAYS(IsValid(aHuffman,aNumCodes),User::Panic(KCat,EHuffmanInvalidCoding)); |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
76 |
// |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
77 |
TFixedArray<TInt,KMaxCodeLength> counts; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
78 |
counts.Reset(); |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
79 |
TInt codes=0; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
80 |
TInt ii; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
81 |
for (ii=0;ii<aNumCodes;++ii) |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
82 |
{ |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
83 |
TInt len=aHuffman[ii]; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
84 |
aDecodeTree[ii]=len; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
85 |
if (--len>=0) |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
86 |
{ |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
87 |
++counts[len]; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
88 |
++codes; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
89 |
} |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
90 |
} |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
91 |
// |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
92 |
TFixedArray<TUint32*,KMaxCodeLength> level; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
93 |
TUint32* lit=aDecodeTree+codes; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
94 |
for (ii=0;ii<KMaxCodeLength;++ii) |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
95 |
{ |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
96 |
level[ii]=lit; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
97 |
lit-=counts[ii]; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
98 |
} |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
99 |
aSymbolBase=(aSymbolBase<<17)+(KHuffTerminate<<16); |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
100 |
for (ii=0;ii<aNumCodes;++ii) |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
101 |
{ |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
102 |
TUint len=TUint8(aDecodeTree[ii]); |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
103 |
if (len) |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
104 |
*--level[len-1]|=(ii<<17)+aSymbolBase; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
105 |
} |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
106 |
if (codes==1) // codes==1 special case: incomplete tree |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
107 |
{ |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
108 |
TUint term=aDecodeTree[0]>>16; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
109 |
aDecodeTree[0]=term|(term<<16); // 0- and 1-terminate at root |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
110 |
} |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
111 |
else if (codes>1) |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
112 |
HuffmanSubTree(aDecodeTree+codes-1,aDecodeTree+codes-1,&level[0]); |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
113 |
} |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
114 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
115 |
// The decoding tree for the externalised code |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
116 |
const TUint32 HuffmanDecoding[]= |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
117 |
{ |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
118 |
0x0004006c, |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
119 |
0x00040064, |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
120 |
0x0004005c, |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
121 |
0x00040050, |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
122 |
0x00040044, |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
123 |
0x0004003c, |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
124 |
0x00040034, |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
125 |
0x00040021, |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
126 |
0x00040023, |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
127 |
0x00040025, |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
128 |
0x00040027, |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
129 |
0x00040029, |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
130 |
0x00040014, |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
131 |
0x0004000c, |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
132 |
0x00040035, |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
133 |
0x00390037, |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
134 |
0x00330031, |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
135 |
0x0004002b, |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
136 |
0x002f002d, |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
137 |
0x001f001d, |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
138 |
0x001b0019, |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
139 |
0x00040013, |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
140 |
0x00170015, |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
141 |
0x0004000d, |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
142 |
0x0011000f, |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
143 |
0x000b0009, |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
144 |
0x00070003, |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
145 |
0x00050001 |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
146 |
}; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
147 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
148 |
/** Restore a canonical huffman encoding from a bit stream |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
149 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
150 |
The encoding must have been stored using Huffman::ExternalizeL(). The resulting |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
151 |
code-length table can be used to create an encoding table using Huffman::Encoding() |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
152 |
or a decoding tree using Huffman::Decoding(). |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
153 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
154 |
@param aInput The input stream with the encoding |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
155 |
@param aHuffman The internalized code-length table is placed here |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
156 |
@param aNumCodes The number of huffman codes in the table |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
157 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
158 |
@leave TBitInput::HuffmanL() |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
159 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
160 |
@see ExternalizeL() |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
161 |
*/ |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
162 |
EXPORT_C void Huffman::InternalizeL(TBitInput& aInput,TUint32 aHuffman[],TInt aNumCodes) |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
163 |
// See ExternalizeL for a description of the format |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
164 |
{ |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
165 |
// initialise move-to-front list |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
166 |
TFixedArray<TUint8,Huffman::KMetaCodes> list; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
167 |
for (TInt i=0;i<list.Count();++i) |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
168 |
list[i]=TUint8(i); |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
169 |
TInt last=0; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
170 |
// extract codes, reverse rle-0 and mtf encoding in one pass |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
171 |
TUint32* p=aHuffman; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
172 |
const TUint32* end=aHuffman+aNumCodes; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
173 |
TUint rl=0; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
174 |
while (p+rl<end) |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
175 |
{ |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
176 |
TInt c=aInput.HuffmanL(HuffmanDecoding); |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
177 |
// c is now 0..28 |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
178 |
if (c<2) |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
179 |
{ |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
180 |
// one of the zero codes used by RLE-0 |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
181 |
// update he run-length |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
182 |
rl+=rl+c+1; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
183 |
} |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
184 |
else |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
185 |
{ |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
186 |
if(rl >= TUint(end-p)) |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
187 |
User::Leave(KErrCorrupt); |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
188 |
while (rl>0) |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
189 |
{ |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
190 |
*p++=last; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
191 |
--rl; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
192 |
} |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
193 |
--c; // c is now 1..27 |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
194 |
list[0]=TUint8(last); |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
195 |
last=list[c]; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
196 |
Mem::Copy(&list[1],&list[0],c); |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
197 |
*p++=last; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
198 |
} |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
199 |
} |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
200 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
201 |
while (p<end) |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
202 |
*p++=last; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
203 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
204 |
} |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
205 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
206 |
// bit-stream input class |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
207 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
208 |
inline TUint reverse(TUint aVal) |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
209 |
// |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
210 |
// Reverse the byte-order of a 32 bit value |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
211 |
// This generates optimal ARM code (4 instructions) |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
212 |
// |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
213 |
{ |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
214 |
TUint v=(aVal<<16)|(aVal>>16); |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
215 |
v^=aVal; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
216 |
v&=0xff00ffff; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
217 |
aVal=(aVal>>8)|(aVal<<24); |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
218 |
return aVal^(v>>8); |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
219 |
} |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
220 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
221 |
/** Construct a bit stream input object |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
222 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
223 |
Following construction the bit stream is ready for reading bits, but will |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
224 |
immediately call UnderflowL() as the input buffer is empty. |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
225 |
*/ |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
226 |
EXPORT_C TBitInput::TBitInput() |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
227 |
:iCount(0),iRemain(0) |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
228 |
{} |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
229 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
230 |
/** Construct a bit stream input object over a buffer |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
231 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
232 |
Following construction the bit stream is ready for reading bits from |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
233 |
the specified buffer. |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
234 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
235 |
@param aPtr The address of the buffer containing the bit stream |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
236 |
@param aLength The length of the bitstream in bits |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
237 |
@param aOffset The bit offset from the start of the buffer to the bit stream (defaults to zero) |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
238 |
*/ |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
239 |
EXPORT_C TBitInput::TBitInput(const TUint8* aPtr, TInt aLength, TInt aOffset) |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
240 |
{ |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
241 |
Set(aPtr,aLength,aOffset); |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
242 |
} |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
243 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
244 |
/** Set the memory buffer to use for input |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
245 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
246 |
Bits will be read from this buffer until it is empty, at which point |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
247 |
UnderflowL() will be called. |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
248 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
249 |
@param aPtr The address of the buffer containing the bit stream |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
250 |
@param aLength The length of the bitstream in bits |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
251 |
@param aOffset The bit offset from the start of the buffer to the bit stream (defaults to zero) |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
252 |
*/ |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
253 |
EXPORT_C void TBitInput::Set(const TUint8* aPtr, TInt aLength, TInt aOffset) |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
254 |
{ |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
255 |
TUint p=(TUint)aPtr; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
256 |
p+=aOffset>>3; // nearest byte to the specified bit offset |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
257 |
aOffset&=7; // bit offset within the byte |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
258 |
const TUint32* ptr=(const TUint32*)(p&~3); // word containing this byte |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
259 |
aOffset+=(p&3)<<3; // bit offset within the word |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
260 |
if (aLength==0) |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
261 |
iCount=0; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
262 |
else |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
263 |
{ |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
264 |
// read the first few bits of the stream |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
265 |
iBits=reverse(*ptr++)<<aOffset; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
266 |
aOffset=32-aOffset; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
267 |
aLength-=aOffset; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
268 |
if (aLength<0) |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
269 |
aOffset+=aLength; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
270 |
iCount=aOffset; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
271 |
} |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
272 |
iRemain=aLength; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
273 |
iPtr=ptr; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
274 |
} |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
275 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
276 |
#ifndef __HUFFMAN_MACHINE_CODED__ |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
277 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
278 |
/** Read a single bit from the input |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
279 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
280 |
Return the next bit in the input stream. This will call UnderflowL() if |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
281 |
there are no more bits available. |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
282 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
283 |
@return The next bit in the stream |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
284 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
285 |
@leave "UnderflowL()" It the bit stream is exhausted more UnderflowL is called |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
286 |
to get more data |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
287 |
*/ |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
288 |
EXPORT_C TUint TBitInput::ReadL() |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
289 |
{ |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
290 |
TInt c=iCount; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
291 |
TUint bits=iBits; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
292 |
if (--c<0) |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
293 |
return ReadL(1); |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
294 |
iCount=c; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
295 |
iBits=bits<<1; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
296 |
return bits>>31; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
297 |
} |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
298 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
299 |
/** Read a multi-bit value from the input |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
300 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
301 |
Return the next few bits as an unsigned integer. The last bit read is |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
302 |
the least significant bit of the returned value, and the value is |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
303 |
zero extended to return a 32-bit result. |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
304 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
305 |
A read of zero bits will always reaturn zero. |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
306 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
307 |
This will call UnderflowL() if there are not enough bits available. |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
308 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
309 |
@param aSize The number of bits to read |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
310 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
311 |
@return The bits read from the stream |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
312 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
313 |
@leave "UnderflowL()" It the bit stream is exhausted more UnderflowL is called |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
314 |
to get more data |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
315 |
*/ |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
316 |
EXPORT_C TUint TBitInput::ReadL(TInt aSize) |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
317 |
{ |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
318 |
if (!aSize) |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
319 |
return 0; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
320 |
TUint val=0; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
321 |
TUint bits=iBits; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
322 |
iCount-=aSize; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
323 |
while (iCount<0) |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
324 |
{ |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
325 |
// need more bits |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
326 |
#ifdef __CPU_X86 |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
327 |
// X86 does not allow shift-by-32 |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
328 |
if (iCount+aSize!=0) |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
329 |
val|=bits>>(32-(iCount+aSize))<<(-iCount); // scrub low order bits |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
330 |
#else |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
331 |
val|=bits>>(32-(iCount+aSize))<<(-iCount); // scrub low order bits |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
332 |
#endif |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
333 |
aSize=-iCount; // bits still required |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
334 |
if (iRemain>0) |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
335 |
{ |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
336 |
bits=reverse(*iPtr++); |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
337 |
iCount+=32; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
338 |
iRemain-=32; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
339 |
if (iRemain<0) |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
340 |
iCount+=iRemain; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
341 |
} |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
342 |
else |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
343 |
{ |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
344 |
UnderflowL(); |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
345 |
bits=iBits; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
346 |
iCount-=aSize; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
347 |
} |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
348 |
} |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
349 |
#ifdef __CPU_X86 |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
350 |
// X86 does not allow shift-by-32 |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
351 |
iBits=aSize==32?0:bits<<aSize; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
352 |
#else |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
353 |
iBits=bits<<aSize; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
354 |
#endif |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
355 |
return val|(bits>>(32-aSize)); |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
356 |
} |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
357 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
358 |
/** Read and decode a Huffman Code |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
359 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
360 |
Interpret the next bits in the input as a Huffman code in the specified |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
361 |
decoding. The decoding tree should be the output from Huffman::Decoding(). |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
362 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
363 |
@param aTree The huffman decoding tree |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
364 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
365 |
@return The symbol that was decoded |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
366 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
367 |
@leave "UnderflowL()" It the bit stream is exhausted more UnderflowL is called |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
368 |
to get more data |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
369 |
*/ |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
370 |
EXPORT_C TUint TBitInput::HuffmanL(const TUint32* aTree) |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
371 |
{ |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
372 |
TUint huff=0; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
373 |
do |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
374 |
{ |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
375 |
aTree=PtrAdd(aTree,huff>>16); |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
376 |
huff=*aTree; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
377 |
if (ReadL()==0) |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
378 |
huff<<=16; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
379 |
} while ((huff&0x10000u)==0); |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
380 |
return huff>>17; |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
381 |
} |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
382 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
383 |
#endif |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
384 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
385 |
/** Handle an empty input buffer |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
386 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
387 |
This virtual function is called when the input buffer is empty and |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
388 |
more bits are required. It should reset the input buffer with more |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
389 |
data using Set(). |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
390 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
391 |
A derived class can replace this to read the data from a file |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
392 |
(for example) before reseting the input buffer. |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
393 |
|
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
394 |
@leave KErrUnderflow The default implementation leaves |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
395 |
*/ |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
396 |
void TBitInput::UnderflowL() |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
397 |
{ |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
398 |
User::Leave(KErrUnderflow); |
0a7b44b10206
Catch up of Symbian tools for @1627812
Pat Downey <patrick.downey@nokia.com>
parents:
diff
changeset
|
399 |
} |