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annotate HuffmanSet.cpp @ 21:3bcdb8bb6914

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Huffman representations.
author Tom Fredrik Blenning Klaussen <bfg@blenning.no>
date Wed, 05 Sep 2012 21:54:53 +0200
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children c0ddc978475a
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21
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1 #include "HuffmanString.hpp"
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2
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3 #include <QtCore/QHash>
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4 #include "NoSuchValueException.hpp"
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5 #include <QtCore/QDebug>
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6
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7 #include "InvalidDataException.hpp"
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8
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9
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10 HuffmanSet::HuffmanSet() : cutoff(128), numInserts(0), lut(0)
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11 {
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12 qDebug() << __FUNCTION__;
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13 }
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14
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15 void HuffmanSet::setCutoff(uint cutoff)
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16 {
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17 this->cutoff = cutoff;
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18 }
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19
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20 QStringList HuffmanSet::chunks(const QString& str)
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21 {
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22 return str.split("");
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23 }
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24
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25 BitDecoder* HuffmanSet::createLut(const QMap<QString, uint>& freqTable)
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26 {
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27 QMultiMap<uint, BitDecoder* > freqs;
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28 for(QMap<QString, uint>::const_iterator it = freqTable.begin();
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29 it != freqTable.end(); ++it) {
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30 freqs.insert(it.value(), new BitDecoder(it.key()));
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31 }
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32
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33 if (freqs.size() == 1) {
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34 QList<uint> keys = freqs.keys();
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35 return freqs.take(keys[0]);
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36 }
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37
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38 QList<uint> keys = freqs.keys();
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39
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40 while (freqs.size() >= 2) {
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41 QList<uint> keys = freqs.keys();
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42
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43 BitDecoder* v0 = freqs.take(keys[0]);
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44 BitDecoder* v1 = freqs.take(keys[1]);
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45
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46 BitDecoder* n = BitDecoder::merge(v0, v1);
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47
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48 freqs.insert(keys[0] + keys[1], n);
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49 }
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50 BitDecoder* retVal = freqs.values()[0];
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51 return retVal;
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52 }
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53
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54 QString HuffmanSet::decode(const QBitArray& bits) const
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55 {
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56 return lut->decode(bits);
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57 }
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58
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59 QBitArray HuffmanSet::encode(const QString& string, const QMap<QString, QBitArray>& encoder)
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60 {
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61 QBitArray retVal;
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62 QStringList c = chunks(string);
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63 foreach(const QString& fragment, c) {
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64 if (encoder.contains(fragment))
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65 retVal = BitDecoder::unite(retVal, encoder[fragment]);
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66 else
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67 throw InvalidDataException();
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68 }
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69 return retVal;
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70 }
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71
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72 uint HuffmanSet::totalElements() const
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73 {
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74 return newStrings.size() + map.size();
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75 }
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76
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77 void HuffmanSet::rebuild()
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78 {
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79 qDebug() << __FUNCTION__ << totalElements() << numInserts << newStrings.size();
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80
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81 QMap<key_t, QBitArray> newVals;
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82
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83 QMap<QString, uint> freqTable;
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84
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85 foreach(key_t key, map.keys()) {
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86 foreach(const QString& chunk, chunks(decode(map.value(key)))) {
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87 ++freqTable[chunk];
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88 }
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89 }
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90 foreach(key_t key, newStrings.keys()) {
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91 foreach(const QString& chunk, chunks(newStrings.value(key))) {
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92 ++freqTable[chunk];
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93 }
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94 }
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95
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96 BitDecoder* newLut = createLut(freqTable);
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97
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98 encoder = newLut->createEncoder();
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99
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100 foreach(key_t key, map.keys()) {
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101 map.insert(key, encode(decode(map.value(key)), encoder));
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102 }
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103 foreach(key_t key, newStrings.keys()) {
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104 map.insert(key, encode(newStrings.value(key), encoder));
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105 }
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106 numInserts = 0;
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107 delete lut;
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108 lut = newLut;
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109 newStrings.clear();
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110 }
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111
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112 bool HuffmanSet::contains(key_t key) const
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113 {
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114 return newStrings.contains(key) || map.contains(key);
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115 }
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116
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117 HuffmanSet::key_t HuffmanSet::hash(const QString& str)
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118 {
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119 key_t key = qHash(str);
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120 while (contains(key) && value(key) != str)
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121 ++key;
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122 return key;
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123 }
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124
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125 HuffmanSet::key_t HuffmanSet::insert(const QString& str)
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126 {
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127 key_t key = hash(str);
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128 if (!contains(key)) {
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129 try {
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130 QBitArray bits = encode(str, encoder);
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131 map.insert(key, bits);
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132 }
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133 catch (InvalidDataException& e) {
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134 newStrings.insert(key, str);
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135 }
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136 if (++numInserts >= cutoff) {
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137 rebuild();
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138 }
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139 }
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140 return key;
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141 }
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142
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143 QString HuffmanSet::value(key_t key) const
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144 {
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145 if (map.contains(key))
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146 return decode(map.value(key));
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147 if (newStrings.contains(key))
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148 return newStrings.value(key);
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149 throw NoSuchValueException();
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150 }