X-Git-Url: https://harishankar.org/repos/?p=wordblah.git;a=blobdiff_plain;f=wordblox.h;h=22963e4dba5d2ffb1b933fcc74de78e401916a75;hp=bd286e3b2ba5207c20f030db7b1a18f78df18adc;hb=3d73a89d86191634ac382e0772708389686b8dde;hpb=762979409c32bd4902716911101a1d1071f11038 diff --git a/wordblox.h b/wordblox.h index bd286e3..22963e4 100644 --- a/wordblox.h +++ b/wordblox.h @@ -1,9 +1,11 @@ #ifndef __WORDBLOX_H #define __WORDBLOX_H - +#define _XOPEN_SOURCE +#include #include #include #include +#include #include "constantstrings.h" #define MAX_PUZZLE_SIZE 20 @@ -42,6 +44,8 @@ typedef struct { String clue_down[MAX_PUZZLE_SIZE][MAX_PUZZLE_SIZE]; int grid_size; bool grid_frozen; + char hashed_password[256]; + char salt[256]; } Puzzle; /* get a number from the user */ @@ -53,6 +57,42 @@ int get_num () return n; } +/* verify password */ +bool verify_password (Puzzle *p, const char* password) +{ + /* no password set */ + if (strcmp (p->hashed_password, "\0") == 0) + return true; + + /* hash the user input password and compare it with the stored password */ + char* hashed_password = crypt (password, (const char *)p->salt); + + if (strcmp (p->hashed_password, hashed_password) == 0) + return true; + + return false; +} + +/* Set or reset password for puzzle */ +void set_puzzle_password (Puzzle *p, const char *password) +{ + /* if it is a null string, reset the password */ + if (strcmp (password, "\0") == 0) + { + strcpy (p->hashed_password, "\0"); + strcpy (p->salt, "\0"); + } + else + { + srand (time(NULL)); + char salt[256]; + sprintf (salt, "puzzle%d", rand()%1000); + char* hashedpwd = crypt (password, (const char*)salt); + strcpy (p->hashed_password, hashedpwd); + strcpy (p->salt, salt); + } +} + /* Output the clues to text file */ void export_clues (Puzzle *p, const char *filename) { @@ -269,32 +309,238 @@ void init_puzzle (Puzzle *p, int grid_size) strcpy (p->clue_down[i][j], ""); } } + strcpy (p->hashed_password, "\0"); + strcpy (p->salt, "\0"); + } -/* save the puzzle */ +/* save the puzzle to a file */ void save_puzzle (Puzzle *puzzle, const char* file) { FILE *outfile; - outfile = fopen (file, "wb"); + /* First output the uncompressed contents to temp file */ + outfile = tmpfile (); if (outfile == NULL) { fprintf (stderr, "%s\n", ERROR_WRITING_FILE); exit (1); } - fwrite (puzzle, sizeof (*puzzle), 1, outfile); + /* grid size is the first field */ + fprintf (outfile, "%d\n", puzzle->grid_size); + /* whether grid is frozen or not */ + fprintf (outfile, "%d\n", puzzle->grid_frozen); + /* the hashed password */ + fprintf (outfile, "%s\n", puzzle->hashed_password); + /* the salt */ + fprintf (outfile, "%s\n", puzzle->salt); + + /* First output the grid characters columns/rows */ + for (int i = 0; i < puzzle->grid_size; i ++) + { + for (int j = 0; j < puzzle->grid_size; j ++) + fprintf (outfile, "%c", puzzle->chars[i][j]); + fprintf (outfile, "\n"); + } + + /* Next output the start across/down numbers */ + for (int i = 0; i < puzzle->grid_size; i ++) + { + for (int j = 0; j < puzzle->grid_size; j++) + { + fprintf (outfile, "%d ", puzzle->start_across_word[i][j]); + fprintf (outfile, "%d ", puzzle->start_down_word[i][j]); + } + fprintf (outfile, "\n"); + } + + /* Output the across clues */ + fprintf (outfile, "ACROSS\n"); + /* Search the grid for across words */ + for (int i = 0; i < puzzle->grid_size; i ++) + { + for (int j = 0; j < puzzle->grid_size; j++) + { + /* if it is an across word, then put the word index followed by + tab character (as separator) and the clue */ + if (puzzle->start_across_word[i][j] != -1) + fprintf (outfile, "%d\t%s\n", puzzle->start_across_word[i][j], + puzzle->clue_across[i][j]); + } + } + + /* Output the down clues */ + fprintf (outfile, "DOWN\n"); + /* Search the grid for down words */ + for (int i = 0; i < puzzle->grid_size; i ++) + { + for (int j = 0; j < puzzle->grid_size; j++) + { + /* same as across word, put the word index followed by the tab + character and then the clue */ + if (puzzle->start_down_word[i][j] != -1) + fprintf (outfile, "%d\t%s\n", puzzle->start_down_word[i][j], + puzzle->clue_down[i][j]); + } + } + + /* Flush the buffer and rewind to beginning - to read and save into + gzip compressed file */ + fflush (outfile); + fseek (outfile, 0, 0); + + /* now compress the file and save it to destination file */ + gzFile outdestfile = gzopen (file, "wb"); + if (outdestfile == NULL) + { + fprintf (stderr, ERROR_WRITING_FILE); + fclose (outfile); + exit (1); + } + char buf[4096]; + while (fread (buf, sizeof(char), 4096, outfile)) + { + int res = gzwrite (outdestfile, buf, strlen (buf) ); + if (res == 0) + { + fprintf (stderr, "%s %s", ERROR_WRITING_FILE, COMPRESSED); + fclose (outfile); + exit (1); + } + } + gzclose (outdestfile); fclose (outfile); + } -/* read the puzzle */ +/* read the puzzle from a file */ Puzzle load_puzzle (const char* file) { - FILE *infile; - Puzzle p; - infile = fopen (file, "rb"); - if (infile == NULL) + /* First open the GZip file */ + gzFile insourcefile = gzopen (file, "rb"); + if (insourcefile == NULL) { - fprintf (stderr, "%s\n", ERROR_READING_FILE); + fprintf (stderr, "%s %s", ERROR_READING_FILE, COMPRESSED); exit (1); } - fread (&p, sizeof(p), 1, infile); + /* Open a temporary file to uncompress the contents */ + FILE *infile = tmpfile (); + if (infile == NULL) + { + fprintf (stderr, ERROR_READING_FILE); + exit (1); + } + /* Put the uncompressed content to the temp file */ + char buf[4096]; + while (gzread (insourcefile, buf, 4096)) + { + int res = fwrite (buf, sizeof(char), strlen (buf), infile); + if (res == 0) + { + fprintf (stderr, ERROR_READING_FILE); + fclose (infile); + gzclose (insourcefile); + exit (1); + } + } + /* Close the gzip file */ + gzclose (insourcefile); + /* Flush the temp file buffer and rewind to beginning */ + fflush (infile); + fseek (infile, 0, 0); + + /* Read the temporary file contents to the structure Puzzle */ + Puzzle p; + char line[MAX_CLUE_LENGTH+10]; + fgets (line, MAX_CLUE_LENGTH + 10, infile); + p.grid_size = atoi (line); + fgets (line, MAX_CLUE_LENGTH + 10, infile); + p.grid_frozen = atoi (line) == 0 ? false : true ; + fgets (line, MAX_CLUE_LENGTH + 10, infile); + if (strlen (line) != 1) + strcpy (p.hashed_password, strtok (line, "\n")); + else + strcpy (p.hashed_password, "\0"); + fgets (line, MAX_CLUE_LENGTH + 10, infile); + if (strlen (line) != 1) + strcpy (p.salt, strtok (line, "\n")); + else + strcpy (p.salt, "\0"); + + /* read each character of the grid */ + for (int i = 0; i < p.grid_size; i ++ ) + { + fgets (line, MAX_CLUE_LENGTH + 10, infile); + for (int j = 0; j < p.grid_size; j ++) + p.chars[i][j] = line[j]; + } + /* read the word numbers */ + for (int i = 0; i < p.grid_size; i ++) + { + fgets (line, MAX_CLUE_LENGTH + 10, infile); + char *token = strtok (line, " "); + for (int j = 0; j < p.grid_size; j ++) + { + if (token != NULL) + p.start_across_word[i][j] = atoi (token); + token = strtok (NULL, " "); + if (token != NULL) + p.start_down_word[i][j] = atoi (token); + token = strtok (NULL, " "); + } + } + /* read the clues */ + fgets (line, MAX_CLUE_LENGTH + 10, infile); + + /* across clues */ + char clues[100][MAX_CLUE_LENGTH]; + int word_num[100]; + int c = 0; + /* first read the across clues from file */ + while (1) + { + fgets (line, MAX_CLUE_LENGTH + 10, infile); + /* if reached the end of across clues */ + if (strcmp (line, "DOWN\n") == 0) + break; + word_num[c] = atoi (strtok (line, "\t")); + char *cl = strtok (NULL, "\n"); + if (cl != NULL) + strcpy (clues[c], cl); + else + strcpy (clues[c], "\0"); + c++; + } + /* set the clue to the correct cell in grid */ + for (int i = 0; i < p.grid_size; i ++) + { + for (int j = 0; j < p.grid_size; j ++) + { + for (int r = 0; r < c; r ++) + if (p.start_across_word[i][j] == word_num[r]) + strcpy (p.clue_across[i][j], clues[r]); + } + } + + /* down clues */ + c = 0; + while (fgets (line, MAX_CLUE_LENGTH + 10, infile)) + { + word_num[c] = atoi (strtok (line, "\t")); + char* cl = strtok (NULL, "\n"); + if (cl != NULL) + strcpy (clues[c], cl); + else + strcpy (clues[c], "\0"); + c++; + } + for (int i = 0; i < p.grid_size; i ++) + { + for (int j = 0; j < p.grid_size; j ++) + { + for (int r = 0; r < c; r ++) + if (p.start_down_word[i][j] == word_num[r]) + strcpy (p.clue_down[i][j], clues[r]); + } + } + fclose (infile); return p; }