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authorMike Buland <eichlan@xagasoft.com>2012-11-05 22:41:51 +0000
committerMike Buland <eichlan@xagasoft.com>2012-11-05 22:41:51 +0000
commitec05778d5718a7912e506764d443a78d6a6179e3 (patch)
tree78a9a01532180030c095acefc45763f07c14edb8 /src/unstable/bitstring.h
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diff --git a/src/unstable/bitstring.h b/src/unstable/bitstring.h
index fd34402..ea884f6 100644
--- a/src/unstable/bitstring.h
+++ b/src/unstable/bitstring.h
@@ -13,212 +13,212 @@
13 13
14namespace Bu 14namespace Bu
15{ 15{
16 /** 16 /**
17 * Manages an arbitrarily sized string of bits, and allows basic interaction 17 * Manages an arbitrarily sized string of bits, and allows basic interaction
18 * with them. This includes basic non-mathematical bitwise operations such 18 * with them. This includes basic non-mathematical bitwise operations such
19 * as setting and testing bits, shifting the string, inversion and a few 19 * as setting and testing bits, shifting the string, inversion and a few
20 * extras like randomization. On linux systems this takes advantage of long 20 * extras like randomization. On linux systems this takes advantage of long
21 * longs giving you a maximum size of about 2tb per string. 21 * longs giving you a maximum size of about 2tb per string.
22 * 22 *
23 * For more general and mathematical type interaction see BitStringInt. 23 * For more general and mathematical type interaction see BitStringInt.
24 * 24 *
25 */ 25 */
26 class BitString 26 class BitString
27 { 27 {
28 public: 28 public:
29 /** 29 /**
30 * Constructs a blank and basic BitString. This is actually useful 30 * Constructs a blank and basic BitString. This is actually useful
31 * since you can resize BitStrings at will, and even retain the data 31 * since you can resize BitStrings at will, and even retain the data
32 * that was in them. 32 * that was in them.
33 */ 33 */
34 BitString(); 34 BitString();
35 35
36 /** 36 /**
37 * Constructs a BitString object as a copy of another BitString. This 37 * Constructs a BitString object as a copy of another BitString. This
38 * is a standard copy constructor and produces an exact duplicate of 38 * is a standard copy constructor and produces an exact duplicate of
39 * the original BitString object. 39 * the original BitString object.
40 *@param xSrc Source BitString to copy data from. 40 *@param xSrc Source BitString to copy data from.
41 */ 41 */
42 BitString( const BitString &xSrc ); 42 BitString( const BitString &xSrc );
43 43
44 /** 44 /**
45 * Constructs a BitString with length iBits and optionally fills it with 45 * Constructs a BitString with length iBits and optionally fills it with
46 * random data. The default setting, to not fill randomly, will produce 46 * random data. The default setting, to not fill randomly, will produce
47 * a blank (all zeros) string of the specified size. 47 * a blank (all zeros) string of the specified size.
48 *@param iBits The length of the new BitString in bits. 48 *@param iBits The length of the new BitString in bits.
49 *@param bFillRandomly Wether or not to randomize this BitString. 49 *@param bFillRandomly Wether or not to randomize this BitString.
50 */ 50 */
51 BitString( long iBits, bool bFillRandomly=false ); 51 BitString( long iBits, bool bFillRandomly=false );
52 52
53 /** 53 /**
54 * Virtual deconstructor for the BitString. Takes care of cleanup for 54 * Virtual deconstructor for the BitString. Takes care of cleanup for
55 * you. What more do you really want to know? 55 * you. What more do you really want to know?
56 */ 56 */
57 virtual ~BitString(); 57 virtual ~BitString();
58 58
59 // basic interaction 59 // basic interaction
60 /** 60 /**
61 * Sets a bit in the BitString. In it's normal mode it will always turn 61 * Sets a bit in the BitString. In it's normal mode it will always turn
62 * the given bit on, to clear a bit set bBitState to false instead of 62 * the given bit on, to clear a bit set bBitState to false instead of
63 * true. This operation runs in O(1). 63 * true. This operation runs in O(1).
64 *@param iBit The zero-based index of the bit to modify. 64 *@param iBit The zero-based index of the bit to modify.
65 *@param bBitState Set to true to set the bit to 1, set to false to set 65 *@param bBitState Set to true to set the bit to 1, set to false to set
66 * the bit to 0. 66 * the bit to 0.
67 */ 67 */
68 void setBit( long iBit, bool bBitState=true ); 68 void setBit( long iBit, bool bBitState=true );
69 69
70 /** 70 /**
71 * Reverses the state of the given bit. This will set the given bit 71 * Reverses the state of the given bit. This will set the given bit
72 * to a 1 if it was 0, and to 0 if it was 1. This operation runs in 72 * to a 1 if it was 0, and to 0 if it was 1. This operation runs in
73 * O(1), and it should be noted that using this is marginally faster 73 * O(1), and it should be noted that using this is marginally faster
74 * than doing the test and flip yourself with getBit and setBit since 74 * than doing the test and flip yourself with getBit and setBit since
75 * it uses a bitwise not operation and doesn't actually test the bit 75 * it uses a bitwise not operation and doesn't actually test the bit
76 * itself. 76 * itself.
77 *@param iBit The index of the bit to flip. 77 *@param iBit The index of the bit to flip.
78 */ 78 */
79 void flipBit( long iBit ); 79 void flipBit( long iBit );
80 80
81 /** 81 /**
82 * Gets the state of the given bit. This follows the standard 82 * Gets the state of the given bit. This follows the standard
83 * convention used so far, a returned value of true means the bit in 83 * convention used so far, a returned value of true means the bit in
84 * question is 1, and a value of flase means the bit is 0. All bits 84 * question is 1, and a value of flase means the bit is 0. All bits
85 * out of range of the BitString are treated as off, but are 85 * out of range of the BitString are treated as off, but are
86 * "accessable" in that this does not produce any kind of error 86 * "accessable" in that this does not produce any kind of error
87 * message. This is intentional. This operation runs in O(1). 87 * message. This is intentional. This operation runs in O(1).
88 *@param iBit The index of the bit to test. 88 *@param iBit The index of the bit to test.
89 *@returns True for a 1, false for a 0. 89 *@returns True for a 1, false for a 0.
90 */ 90 */
91 bool getBit( long iBit ); 91 bool getBit( long iBit );
92 92
93 /** 93 /**
94 * Inverts the entire BitString, in effect this calls flipBit on every 94 * Inverts the entire BitString, in effect this calls flipBit on every
95 * bit in the string but is faster since it can operate on whole bytes 95 * bit in the string but is faster since it can operate on whole bytes
96 * at a time instead of individual bits. This operation runs in O(N). 96 * at a time instead of individual bits. This operation runs in O(N).
97 */ 97 */
98 void invert(); 98 void invert();
99 99
100 /** 100 /**
101 * Returns the number of bits allocated in this BitString. This 101 * Returns the number of bits allocated in this BitString. This
102 * operation runs in O(1) time since this value is cached and not 102 * operation runs in O(1) time since this value is cached and not
103 * computed. 103 * computed.
104 *@returns The number of bits allocated in this BitString. 104 *@returns The number of bits allocated in this BitString.
105 */ 105 */
106 DEPRECATED 106 DEPRECATED
107 long getBitLength(); 107 long getBitLength();
108 108
109 long getSize(); 109 long getSize();
110 110
111 /** 111 /**
112 * Sets the entire BitString to zeros, but it does it very quickly. 112 * Sets the entire BitString to zeros, but it does it very quickly.
113 * This operation runs in O(N). 113 * This operation runs in O(N).
114 */ 114 */
115 void clear(); 115 void clear();
116 116
117 /** 117 /**
118 * Gets another BitString that is autonomous of the current one 118 * Gets another BitString that is autonomous of the current one
119 * (contains a copy of the memory, not a pointer) and contains a subset 119 * (contains a copy of the memory, not a pointer) and contains a subset
120 * of the data in the current BitString. This is an inclusive 120 * of the data in the current BitString. This is an inclusive
121 * operation, so grabbing bits 0-5 will give you 6 bits. This is based 121 * operation, so grabbing bits 0-5 will give you 6 bits. This is based
122 * on a very tricky bit-shifting algorithm and runs very quickly, in 122 * on a very tricky bit-shifting algorithm and runs very quickly, in
123 * O(N) time. Passing in a value of zero for iUpper, or any value for 123 * O(N) time. Passing in a value of zero for iUpper, or any value for
124 * iUpper that is less than iLower will set iUpper equal to the number 124 * iUpper that is less than iLower will set iUpper equal to the number
125 * of bits in the BitString. 125 * of bits in the BitString.
126 *@param iLower The first bit in the current string, will be the first 126 *@param iLower The first bit in the current string, will be the first
127 * bit (0 index) in the new sub string. 127 * bit (0 index) in the new sub string.
128 *@param iUpper The last bit in the current string, will be the last 128 *@param iUpper The last bit in the current string, will be the last
129 * bit in the new sub string. iUpper is included in the sub string. 129 * bit in the new sub string. iUpper is included in the sub string.
130 *@returns A new BitString object ready to be used. Please note that 130 *@returns A new BitString object ready to be used. Please note that
131 * managing this new object is up to whomever calls this function. 131 * managing this new object is up to whomever calls this function.
132 */ 132 */
133 class BitString getSubString( long iLower, long iUpper ); 133 class BitString getSubString( long iLower, long iUpper );
134 134
135 /** 135 /**
136 * Sets the number of bits in the BitString, allocating more memory if 136 * Sets the number of bits in the BitString, allocating more memory if
137 * necesarry, or freeing extra if able. The default operation of this 137 * necesarry, or freeing extra if able. The default operation of this
138 * function clears all data in the BitString while resizing it. If you 138 * function clears all data in the BitString while resizing it. If you
139 * would like to keep as much of the data that you had in your BitString 139 * would like to keep as much of the data that you had in your BitString
140 * as possible, then set bClear to false, and any data that will fit 140 * as possible, then set bClear to false, and any data that will fit
141 * into the new BitString length will be retained. If increasing the 141 * into the new BitString length will be retained. If increasing the
142 * number of bits, the new bits will come into existance cleared (set 142 * number of bits, the new bits will come into existance cleared (set
143 * to 0). 143 * to 0).
144 *@param iLength The number of bits to set the BitString to. 144 *@param iLength The number of bits to set the BitString to.
145 *@param bClear When true, all data is eradicated and zeroed, when set 145 *@param bClear When true, all data is eradicated and zeroed, when set
146 * to false an effort is made to retain the existing data. 146 * to false an effort is made to retain the existing data.
147 *@returns true on success, false on failure. 147 *@returns true on success, false on failure.
148 */ 148 */
149 DEPRECATED 149 DEPRECATED
150 bool setBitLength( long iLength, bool bClear=true ); 150 bool setBitLength( long iLength, bool bClear=true );
151 bool setSize( long iLength, bool bClear=true ); 151 bool setSize( long iLength, bool bClear=true );
152 152
153 /** 153 /**
154 * Randomize the entire BitString, one bit at a time. This is actually 154 * Randomize the entire BitString, one bit at a time. This is actually
155 * the function called by the constructor when the user selects initial 155 * the function called by the constructor when the user selects initial
156 * randomization. This function uses the system random() function, so 156 * randomization. This function uses the system random() function, so
157 * srandom may be used to effect this process at will. 157 * srandom may be used to effect this process at will.
158 */ 158 */
159 void randomize(); 159 void randomize();
160 160
161 /** 161 /**
162 * Operates exactly like <<. All data in the BitString is shifted to 162 * Operates exactly like <<. All data in the BitString is shifted to
163 * the left by some number of bits, any data pushed off the edge of the 163 * the left by some number of bits, any data pushed off the edge of the
164 * BitString is lost, and all new data coming in will be zeroed. 164 * BitString is lost, and all new data coming in will be zeroed.
165 * Using a negative value in the shiftLeft function will turn it into 165 * Using a negative value in the shiftLeft function will turn it into
166 * the shiftRight function. 166 * the shiftRight function.
167 *@param iAmt The number of bit positions to shift all data. 167 *@param iAmt The number of bit positions to shift all data.
168 */ 168 */
169 void shiftLeft( long iAmt ); // just like << 169 void shiftLeft( long iAmt ); // just like <<
170 170
171 /** 171 /**
172 * Operates exactly like >>. All data in the BitString is shifted to 172 * Operates exactly like >>. All data in the BitString is shifted to
173 * the right by some number of bits, any data pushed off the edge of the 173 * the right by some number of bits, any data pushed off the edge of the
174 * BitString is lost, and all new data coming in will be zeroed. 174 * BitString is lost, and all new data coming in will be zeroed.
175 * Using a negative value in the shiftRight function will turn it into 175 * Using a negative value in the shiftRight function will turn it into
176 * the shiftLeft function. 176 * the shiftLeft function.
177 *@param iAmt The number of bit positions to shift all data. 177 *@param iAmt The number of bit positions to shift all data.
178 */ 178 */
179 void shiftRight( long iAmt ); // just like >> 179 void shiftRight( long iAmt ); // just like >>
180 180
181 /** 181 /**
182 * Searches through the BitString and returns the index of the highest 182 * Searches through the BitString and returns the index of the highest
183 * order bit position (the highest index) with an on bit (a bit set to 183 * order bit position (the highest index) with an on bit (a bit set to
184 * 1). This is a handy helper function and rather faster than calling 184 * 1). This is a handy helper function and rather faster than calling
185 * getBit() over and over again. 185 * getBit() over and over again.
186 *@returns The index of the highest indexed on bit. 186 *@returns The index of the highest indexed on bit.
187 */ 187 */
188 long getHighestOrderBitPos(); 188 long getHighestOrderBitPos();
189 189
190 // Conversion 190 // Conversion
191 /** 191 /**
192 * Convert a block of data (no more than 32 bits) to a primitive long 192 * Convert a block of data (no more than 32 bits) to a primitive long
193 * type. 193 * type.
194 * This is done in a little bit interesting way, so it may not always be 194 * This is done in a little bit interesting way, so it may not always be
195 * the fastest way to access the data that you want, although it will 195 * the fastest way to access the data that you want, although it will
196 * always ensure that the long that is written makes numerical sense, as 196 * always ensure that the long that is written makes numerical sense, as
197 * we write numbers, regaurdless of platform. 197 * we write numbers, regaurdless of platform.
198 *@param iStart The first bit in the BitString to include in the long 198 *@param iStart The first bit in the BitString to include in the long
199 *@param iSize THe number of bits to include, if this value is set over 199 *@param iSize THe number of bits to include, if this value is set over
200 * 32 it will be automatically truncated to, or however many bits there 200 * 32 it will be automatically truncated to, or however many bits there
201 * are in a long in your system. 201 * are in a long in your system.
202 *@returns A long converted from your raw BitString data. 202 *@returns A long converted from your raw BitString data.
203 */ 203 */
204 long toLong( long iStart = 0, long iSize = 32 ); 204 long toLong( long iStart = 0, long iSize = 32 );
205 205
206 Bu::String toString(); 206 Bu::String toString();
207 207
208 //operators 208 //operators
209 BitString &operator=( const BitString &xSrc ); 209 BitString &operator=( const BitString &xSrc );
210 BitString operator~(); 210 BitString operator~();
211 BitString operator<<( const long iAmt ); 211 BitString operator<<( const long iAmt );
212 BitString operator>>( const long iAmt ); 212 BitString operator>>( const long iAmt );
213 213
214 private: 214 private:
215 void fixup(); 215 void fixup();
216 void setMask(); 216 void setMask();
217 unsigned char *caData; 217 unsigned char *caData;
218 long iBits; 218 long iBits;
219 long iBytes; 219 long iBytes;
220 unsigned char cTopByteMask; 220 unsigned char cTopByteMask;
221 }; 221 };
222}; 222};
223 223
224#endif 224#endif