--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sources/huffman/huffman.cpp Thu Dec 11 07:18:11 2014 +0200
@@ -0,0 +1,159 @@
+/*
+ * Replacement for older Skulltag Launcher Protocol's huffman.cpp
+ *
+ * Copyright 2009 Timothy Landers
+ * email: code.vortexcortex@gmail.com
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+// required for atexit()
+#include <stdlib.h>
+#include <stdio.h>
+
+#include "huffman.h"
+#include "huffcodec.h"
+// #include "i_system.h"
+
+using namespace skulltag;
+// Global Variables
+
+/** Reference to the HuffmanCodec Object that will perform the encoding and decoding. */
+static HuffmanCodec * __codec = NULL;
+
+// Function Implementation
+
+/** Creates and intitializes a HuffmanCodec Object. <br>
+ * Also arranges for HUFFMAN_Destruct() to be called upon termination. */
+void HUFFMAN_Construct(){
+
+ // The exact structure description of a Huffman tree
+ static unsigned char const compatible_huffman_tree[] = {
+ 0, 0, 0, 1,128, 0, 0, 0, 3, 38, 34, 2, 1, 80, 3,110,
+ 144, 67, 0, 2, 1, 74, 3,243,142, 37, 2, 3,124, 58,182, 0,
+ 0, 1, 36, 0, 3,221,131, 3,245,163, 1, 35, 3,113, 85, 0,
+ 1, 41, 1, 77, 3,199,130, 0, 1,206, 3,185,153, 3, 70,118,
+ 0, 3, 3, 5, 0, 0, 1, 24, 0, 2, 3,198,190, 63, 2, 3,
+ 139,186, 75, 0, 1, 44, 2, 3,240,218, 56, 3, 40, 39, 0, 0,
+ 2, 2, 3,244,247, 81, 65, 0, 3, 9,125, 3, 68, 60, 0, 0,
+ 1, 25, 3,191,138, 3, 86, 17, 0, 1, 23, 3,220,178, 2, 3,
+ 165,194, 14, 1, 0, 2, 2, 0, 0, 2, 1,208, 3,150,157,181,
+ 1,222, 2, 3,216,230,211, 0, 2, 2, 3,252,141, 10, 42, 0,
+ 2, 3,134,135,104, 1,103, 3,187,225, 95, 32, 0, 0, 0, 0,
+ 0, 0, 1, 57, 1, 61, 3,183,237, 0, 0, 3,233,234, 3,246,
+ 203, 2, 3,250,147, 79, 1,129, 0, 1, 7, 3,143,136, 1, 20,
+ 3,179,148, 0, 0, 0, 3, 28,106, 3,101, 87, 1, 66, 0, 3,
+ 180,219, 3,227,241, 0, 1, 26, 1,251, 3,229,214, 3, 54, 69,
+ 0, 0, 0, 0, 0, 3,231,212, 3,156,176, 3, 93, 83, 0, 3,
+ 96,253, 3, 30, 13, 0, 0, 2, 3,175,254, 94, 3,159, 27, 2,
+ 1, 8, 3,204,226, 78, 0, 0, 0, 3,107, 88, 1, 31, 3,137,
+ 169, 2, 2, 3,215,145, 6, 4, 1,127, 0, 1, 99, 3,209,217,
+ 0, 3,213,238, 3,177,170, 1,132, 0, 0, 0, 2, 3, 22, 12,
+ 114, 2, 2, 3,158,197, 97, 45, 0, 1, 46, 1,112, 3,174,249,
+ 0, 3,224,102, 2, 3,171,151,193, 0, 0, 0, 3, 15, 16, 3,
+ 2,168, 1, 49, 3, 91,146, 0, 1, 48, 3,173, 29, 0, 3, 19,
+ 126, 3, 92,242, 0, 0, 0, 0, 0, 0, 3,205,192, 2, 3,235,
+ 149,255, 2, 3,223,184,248, 0, 0, 3,108,236, 3,111, 90, 2,
+ 3,117,115, 71, 0, 0, 3, 11, 50, 0, 3,188,119, 1,122, 3,
+ 167,162, 1,160, 1,133, 3,123, 21, 0, 0, 2, 1, 59, 2, 3,
+ 155,154, 98, 43, 0, 3, 76, 51, 2, 3,201,116, 72, 2, 0, 2,
+ 3,109,100,121, 2, 3,195,232, 18, 1, 0, 2, 0, 1,164, 2,
+ 3,120,189, 73, 0, 1,196, 3,239,210, 3, 64, 62, 89, 0, 0,
+ 1, 33, 2, 3,228,161, 55, 2, 3, 84,152, 47, 0, 0, 2, 3,
+ 207,172,140, 3, 82,166, 0, 3, 53,105, 1, 52, 3,202,200
+ };
+
+ // create a HuffmanCodec that is compatible with the previous implementation.
+ __codec = new HuffmanCodec( compatible_huffman_tree, sizeof compatible_huffman_tree );
+
+ // set up the HuffmanCodec to perform in a backwards compatible fashion.
+ __codec->reversedBytes( true );
+ __codec->allowExpansion( false );
+
+ // request that the destruct function be called upon exit.
+ // atterm( HUFFMAN_Destruct );
+ atexit( HUFFMAN_Destruct );
+}
+
+/** Releases resources allocated by the HuffmanCodec. */
+void HUFFMAN_Destruct(){
+ delete __codec;
+ __codec = NULL;
+}
+
+/** Applies Huffman encoding to a block of data. */
+void HUFFMAN_Encode(
+ /** in: Pointer to start of data that is to be encoded. */
+ unsigned char const * const inputBuffer,
+ /** out: Pointer to destination buffer where encoded data will be stored. */
+ unsigned char * const outputBuffer,
+ /** in: Number of chars to read from inputBuffer. */
+ int const &inputBufferSize,
+ /**< in+out: Max chars to write into outputBuffer. <br>
+ * Upon return holds the number of chars stored or 0 if an error occurs. */
+ int * outputBufferSize
+){
+ int bytesWritten = __codec->encode( inputBuffer, outputBuffer, inputBufferSize, *outputBufferSize );
+
+ // expansion occured -- provide backwards compatibility
+ if ( bytesWritten < 0 ){
+ // check buffer sizes
+ if ( *outputBufferSize < (inputBufferSize + 1) ){
+ // outputBuffer too small, return "no bytes written"
+ *outputBufferSize = 0;
+ return;
+ }
+
+ // perform the unencoded copy
+ for ( int i = 0; i < inputBufferSize; i++ ) outputBuffer[i+1] = inputBuffer[i];
+ // supply the "unencoded" signal and bytesWritten
+ outputBuffer[0] = 0xff;
+ *outputBufferSize = inputBufferSize + 1;
+ } else {
+ // assign the bytesWritten return value
+ *outputBufferSize = bytesWritten;
+ }
+} // end function HUFFMAN_Encode
+
+/** Decodes a block of data that is Huffman encoded. */
+void HUFFMAN_Decode(
+ unsigned char const * const inputBuffer, /**< in: Pointer to start of data that is to be decoded. */
+ unsigned char * const outputBuffer, /**< out: Pointer to destination buffer where decoded data will be stored. */
+ int const &inputBufferSize, /**< in: Number of chars to read from inputBuffer. */
+ int *outputBufferSize /**< in+out: Max chars to write into outputBuffer. Upon return holds the number of chars stored or 0 if an error occurs. */
+){
+ // check for "unencoded" signal & provide backwards compatibility
+ if ((inputBufferSize > 0) && ((inputBuffer[0]&0xff) == 0xff)){
+ // check buffer sizes
+ if ( *outputBufferSize < (inputBufferSize - 1) ){
+ // outputBuffer too small, return "no bytes written"
+ *outputBufferSize = 0;
+ return;
+ }
+
+ // perform the unencoded copy
+ for ( int i = 1; i < inputBufferSize; i++ ) outputBuffer[i-1] = inputBuffer[i];
+
+ // supply the bytesWritten
+ *outputBufferSize = inputBufferSize - 1;
+ } else {
+ // decode the data
+ *outputBufferSize = __codec->decode( inputBuffer, outputBuffer, inputBufferSize, *outputBufferSize );
+ }
+} // end function HUFFMAN_Decode