Figure 1320 The Huf fmanTree class interface in Java

Making ANSI/AIM Code 39 in Java Figure 1320 The Huf fmanTree class interface
Figure 1320 The Huf fmanTree class interface
Code39 Generator In Java
Using Barcode creator for Java Control to generate, create Code39 image in Java applications.
the CharCounter object, and immediately calls the private routine createTreeThe CharCounter object is initialized to be empty in the zero-parameter constructor For getcode, by consulting the map, we obtain a pointer to the tree node that stores the character whose code we are looking for If the character is not in the map we signal an error by returning a zero-length vector Otherwise we use a straightforward loop up the tree, following parent pointers, until we reach the root (which has no parent) Each step appends a 0 or 1 to
Create Bar Code In Java
Using Barcode generator for Java Control to generate, create bar code image in Java applications.
File Compression 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43
Barcode Reader In Java
Using Barcode decoder for Java Control to read, scan read, scan image in Java applications.
/ / Construct the tree given a CharCounter objecr / / Tree will be usable
Code 39 Printer In Visual C#.NET
Using Barcode maker for .NET framework Control to generate, create Code 39 Full ASCII image in .NET framework applications.
HuffmanTree::3uffmanTree( const CharCounter : thecountsi cc )
USS Code 39 Creation In .NET Framework
Using Barcode creator for ASP.NET Control to generate, create Code 39 Extended image in ASP.NET applications.
root = NULL; createTree ( )
Create Code 39 Extended In Visual Studio .NET
Using Barcode maker for .NET Control to generate, create ANSI/AIM Code 39 image in Visual Studio .NET applications.
/ / Construct the tree in an unusable state / / A call to readEncodingTable is expected to follow
Making Code 39 Full ASCII In VB.NET
Using Barcode generator for VS .NET Control to generate, create USS Code 39 image in Visual Studio .NET applications.
HuffmanTree: :HuffmanTree(
Encode Bar Code In Java
Using Barcode printer for Java Control to generate, create barcode image in Java applications.
root
ANSI/AIM Code 39 Creation In Java
Using Barcode creation for Java Control to generate, create USS Code 39 image in Java applications.
NULL;
Create UPC-A Supplement 2 In Java
Using Barcode creation for Java Control to generate, create UPC A image in Java applications.
/ / Return the code corresponding to character ch / / (The parameter is an int to accommodate EOF) / / If code is not found, return a vector of size 0
Bar Code Creation In Java
Using Barcode creator for Java Control to generate, create barcode image in Java applications.
vector<int> HuffmanTree::getCode( int ch
ANSI/AIM Code 128 Encoder In Java
Using Barcode maker for Java Control to generate, create Code 128C image in Java applications.
const
USPS Confirm Service Barcode Maker In Java
Using Barcode drawer for Java Control to generate, create USPS Confirm Service Barcode image in Java applications.
map<int,HuffNode *,lesscint> >::const-iterator itr; itr = theNodesfind( ch ) ; if( itr == theNodesend( ) ) return vector<int>( ) ; HuffNode *current = (*itr) second; vector<int> v ; HuffNode *par = current->parent; while( par ! = NULL
UPC-A Supplement 2 Decoder In .NET
Using Barcode decoder for .NET framework Control to read, scan read, scan image in .NET framework applications.
if( par->left == current ) vpush-back( 0 ) ; / / current is a left child else vpush-back( 1 i ; / / current is a right child current = current->parent; par = current->parent;
UPC - 13 Drawer In .NET Framework
Using Barcode creation for ASP.NET Control to generate, create EAN-13 Supplement 5 image in ASP.NET applications.
reverse( vbegin( ) , vend( return v;
Paint GTIN - 128 In Visual Studio .NET
Using Barcode generation for .NET Control to generate, create EAN 128 image in Visual Studio .NET applications.
Figure 1321 Some of the Huffman tree methods including constructors and the routine for returning a code for a given character
Create EAN / UCC - 13 In .NET Framework
Using Barcode drawer for .NET framework Control to generate, create EAN-13 image in .NET applications.
utilities
Barcode Printer In .NET
Using Barcode encoder for ASP.NET Control to generate, create barcode image in ASP.NET applications.
~~~~~~
Create Barcode In VS .NET
Using Barcode creation for .NET Control to generate, create bar code image in .NET framework applications.
1 / / Get the character corresponding to code 2 int HuffmanTree::getChar( const vector<int> 3 I 4 HuffNode *p = root;
Barcode Generator In Visual Studio .NET
Using Barcode creator for .NET Control to generate, create bar code image in VS .NET applications.
code
const
10 11 12 13 14 1
for( int i = 0; p ! = NULL if( code[ i ] = = 0 j p = p->left; else p = p->right; if( p == NULL j return ERROR; return p->value;
i < codesize(
Figure 1322 A routine for decoding (generating a character, given the code)
the end of the vector maintaining the code These actions give the code in reverse order, so we use the reverse generic algorithm (provided as part of <algorithm>) to fix things The getchar method shown in Figure 1322 is simpler: We start at the root, and branch left or right, as directed by the code Reaching NULL prematurely generates an error Otherwise, we return the value stored in the node (which for nonleaf nodes turns out to be the symbol INCOMPLETE) In Figure 1323 we have routines to read and write the encoding table The format that we use is simple and is not necessarily the most spaceefficient For each character that has a code, we write it out (using one byte) and then write out its character count with formatted 110 So the character count could take as little as 1 byte (if it occurs 9 times or less), or more than four bytes (if it occurs 10,000 or more times) After the character count, we write a newline We signal the end of the table by writing out an extra entry containing a null terminator character \ 0 with a count of zero The count of zero is special The readEncodingTablemethod initializes all the character counts to zero and then reads the table, and updates the counts as they are read It calls createTree,shown in Figure 1324, to build the Huffman tree In that routine, we maintain a priority queue of pointers to tree nodes To do so we must provide a comparison function for tree nodes There are two important details First, the Standard Library priority-queue function accesses the maximum item rather than the minimum So we reverse the meaning of operator<,as shown on lines 3 to 6 Second, we cannot have a priority queue of pointers because the comparison function for pointers is meaningless (it compares memory locations) Thus we use the Pointer
1 2 3 4 5 6 7 8 9
/ / Write an encoding table to an output stream /: Format is character, count (formatted), newline / / A zero count terminates the encoding table