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author | Mike Buland <eichlan@xagasoft.com> | 2012-11-05 22:41:51 +0000 |
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committer | Mike Buland <eichlan@xagasoft.com> | 2012-11-05 22:41:51 +0000 |
commit | ec05778d5718a7912e506764d443a78d6a6179e3 (patch) | |
tree | 78a9a01532180030c095acefc45763f07c14edb8 /src/unstable/bitstring.h | |
parent | b20414ac1fe80a71a90601f4cd1767fa7014a9ba (diff) | |
download | libbu++-ec05778d5718a7912e506764d443a78d6a6179e3.tar.gz libbu++-ec05778d5718a7912e506764d443a78d6a6179e3.tar.bz2 libbu++-ec05778d5718a7912e506764d443a78d6a6179e3.tar.xz libbu++-ec05778d5718a7912e506764d443a78d6a6179e3.zip |
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Diffstat (limited to '')
-rw-r--r-- | src/unstable/bitstring.h | 412 |
1 files changed, 206 insertions, 206 deletions
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 | ||
14 | namespace Bu | 14 | namespace 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 |