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Internet security homework helper

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Joe B

Bachelors in Computer science, Texas Tech University

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Internet security homework helper

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Dynamic memory allocation

#include "C2A5E4_StatusCode-Driver.h" #define HEX_NUMBER(x) ('0' <= x && x <= '9') #define HEX_LETTER(x) (('a' <= x && x <= 'f') || ('A' <= x && x <= 'F')) #define HEX_DIGIT(x) (HEX_NUMBER(x) || HEX_LETTER(x)) #define STATE_START ( 1) #define STATE_PREFIX ( 2) #define STATE_PREFIX_START ( 3) #define STATE_WHOLE ( 4) #define STATE_NOT_WHOLE ( 5) #define STATE_FRACT ( 6) #define STATE_EXPONENT ( 7) #define STATE_POSITIVE_SIGN ( 8) #define STATE_NEGATIVE_SIGN ( 9) #define STATE_POSITIVE_EXPONENT (10) #define STATE_NEGATIVE_EXPONENT (11) StatusCodeDetectFloats(const char *chPtr) { int state = STATE_START; char letter = '\0'; while (true) { letter = *chPtr; chPtr = &chPtr[1]; switch (state) { case STATE_START: { if (letter == '0') { state = STATE_PREFIX; continue; } return StatusCode::NO_MATCH; } case STATE_PREFIX: { if (letter == 'X' || letter == 'x') { state = STATE_PREFIX_START; continue; } return StatusCode::NO_MATCH; } case STATE_PREFIX_START: { if (HEX_DIGIT(letter)) { state = STATE_WHOLE; continue; } if (letter == '.') { state = STATE_NOT_WHOLE; continue; } return StatusCode::NO_MATCH; } case STATE_WHOLE: { if (HEX_DIGIT(letter)) { continue; } if (letter == '.') { state = STATE_FRACT; continue; } if (letter == 'P' || letter == 'p') { state = STATE_EXPONENT; continue; } return StatusCode::NO_MATCH; } case STATE_NOT_WHOLE: { if (HEX_DIGIT(letter)) { state = STATE_FRACT; continue; } return StatusCode::NO_MATCH; } case STATE_FRACT: { if (HEX_DIGIT(letter)) { continue; } if (letter == 'P' || letter == 'p') { state = STATE_EXPONENT; continue; } return StatusCode::NO_MATCH; } case STATE_EXPONENT: { if (HEX_DIGIT(letter)) { state = STATE_POSITIVE_EXPONENT; continue; } if (letter == '+') { state = STATE_POSITIVE_SIGN; continue; } if (letter == '-') { state = STATE_NEGATIVE_SIGN; continue; } return StatusCode::NO_MATCH; } case STATE_POSITIVE_SIGN: { if (HEX_DIGIT(letter)) { state = STATE_POSITIVE_EXPONENT; continue; } return StatusCode::NO_MATCH; } case STATE_POSITIVE_EXPONENT: { if (letter == 'F' || letter == 'f') { return StatusCode::TYPE_FLOAT; } if (letter == 'L' || letter == 'l') { return StatusCode::TYPE_LDOUBLE; } if (letter == '\0') { return StatusCode::TYPE_DOUBLE; } if (HEX_DIGIT(letter)) { continue; } return StatusCode::NO_MATCH; } case STATE_NEGATIVE_SIGN: { if (HEX_DIGIT(letter)) { state = STATE_NEGATIVE_EXPONENT; continue; } return StatusCode::NO_MATCH; } case STATE_NEGATIVE_EXPONENT: { if (letter == 'F' || letter == 'f') { return StatusCode::TYPE_FLOAT; } if (letter == 'L' || letter == 'l') { return StatusCode::TYPE_LDOUBLE; } if (letter == '\0') { return StatusCode::TYPE_DOUBLE; } if (HEX_DIGIT(letter)) { continue; } return StatusCode::NO_MATCH; } } } } #include #include #include #include using namespace std; void OpenFile(const char *fileName, ifstream&inFile) { inFile.open(fileName); if (!inFile.is_open()) { std::cerr<< "Could not open file!" < #include #include #include void SwapObjects(void *pa, void *pb, size_t size) { if (size == 0) { // nothing to do in this case return; } void *pc; pc = malloc(size); // gets the error code for the malloc operation int malloc_errno = errno; if (pc == NULL) { // could not allocate memory fprintf(stderr, "Could not allocate temporary buffer for swapping!\n"); exit(malloc_errno); } // swaps values, using temporary buffer 'pc' memcpy(pc, pa, size); memcpy(pa, pb, size); memcpy(pb, pc, size); // releases the temporary buffer free(pc); } #include #include #include #include "C2A5E2_Type-Driver.h" Type **Create2D(size_t rows, size_t cols) { size_tfull_length = rows * cols; Type *data_array; data_array = malloc(sizeof(*data_array) * full_length); // gets the error code for the malloc operation int malloc_errno_a = errno; if (data_array == NULL) { // could not allocate memory fprintf(stderr, "Could not allocate data array!\n"); exit(malloc_errno_a); } Type **pointer_array; pointer_array = malloc(sizeof(*pointer_array) * rows); // gets the error code for the malloc operation int malloc_errno_b = errno; if (pointer_array == NULL) { // could not allocate memory fprintf(stderr, "Could not allocate pointer array!\n"); exit(malloc_errno_b); } // setups all pointers to point to the right place in data_array for (int index = 0; index < rows; index += 1) { pointer_array[index] = &data_array[(index * cols)]; } return pointer_array; } void Free2D(void *p) { Type **pointer_array; pointer_array = (Type **) p; Type *data_array; data_array = pointer_array[0]; free(data_array); free(pointer_array); }

Creating a database in SQL

CREATE USER 'cs363'@'%1'; GRANT DROP, CREATE, INSERT, DELETE ON tweets.* TO 'cs363'@'%1'; CREATE SCHEMA tweets; DROP TABLE IF EXISTS tweets.HasHashTag; DROP TABLE IF EXISTS tweets.HasURL; DROP TABLE IF EXISTS tweets.userTweets; DROP TABLE IF EXISTS tweets.users; DROP TABLE IF EXISTS tweets.tweets; DROP TABLE IF EXISTS tweets.state; CREATE TABLE tweets.url( urlVARCHAR(255) PRIMARY KEY ); CREATE TABLE tweets.tags ( hashtag VARCHAR(150) PRIMARY KEY ); CREATE TABLE tweets.state( state VARCHAR(50) PRIMARY KEY ); CREATE TABLE tweets.tweets( TID INTEGER PRIMARY KEY, text VARCHAR(240) NOT NULL, retweeted BOOLEAN NOT NULL, tCount INTEGER NOT NULL CHECK (tCount>=0), date DATE NOT NULL, createdON TIMESTAMP ); CREATE TABLE tweets.users ( ScreenNameVARCHAR(100) PRIMARY KEY, NAME VARCHAR(255) NOT NULL, Followers INTEGER NOT NULL CHECK (Followers>=0), Follow INTEGER NOT NULL CHECK (Follow>=0), Category VARCHAR(100) NOT NULL, SubCategoryVARCHAR(100) NOT NULL, Location VARCHAR(150) NOT NULL, State VARCHAR(50), FOREIGN KEY(State) REFERENCES tweets.state(state) ); CREATE TABLE tweets.HasURL ( TID INTEGER, URL VARCHAR(255) , PRIMARY KEY(TID,URL), FOREIGN KEY(URL) REFERENCES tweets.url(URL), FOREIGN KEY(TID) REFERENCES tweets.tweets(TID) ); CREATE TABLE tweets.HasHashTag ( TID INTEGER, hashtags VARCHAR(150) , PRIMARY KEY(TID,hashtags), FOREIGN KEY(hashtags) REFERENCES tweets.tags(hashtags), FOREIGN KEY(TID) REFERENCES tweets.tweets(TID) ); CREATE TABLE tweets.userTweets ( TID INTEGER, ScreenNameVARCHAR(100) , PRIMARY KEY(TID,ScreenName), FOREIGN KEY(ScreenName) REFERENCES tweets.users(ScreenName), FOREIGN KEY(TID) REFERENCES tweets.tweets(TID) );