Add dec and enc functions, encryption!

README.md

@@ -38,6 +38,10 @@ at this moment!
     * filedata=File '%filename%' is being moved to moo -> %filename% is populated as file.txt
     * write "%filename%" "%filedata%" -> writes filedata contents to file.txt as expected.
 
+* Decoding and encoding strings
+    * enc "Regular string" -> Converts to encrypted string 'Uhjvqds#xuulqj'
+    * dec "Uhjvqds#xuulqj" -> Converts back to 'Regular string'
+
 Todo list
 ----
 * Add in-script functions

src/deps.h

@@ -19,3 +19,6 @@
 #define TOKEN             	    '%'
 #define TOKEN_STR         	    "%"
 #define NULLBYTE                '\0'
+#define ENCOFFSET               3
+#define ENCSTEPODD              2
+#define ENCSTEPEVEN             2

src/functions.c

@@ -9,10 +9,54 @@
 #include "functions.h"
 #include "util.h"
 
+char *ss_encrypt(char *string)
+{
+    int i;
+    int str_len;
+
+    str_len = strlen(string);
+
+    for(i = 0; (i < str_len && string[i] != NULLBYTE); i++)
+        string[i] = string[i] + ENCOFFSET;
+
+    for(i = 0; (i < str_len && string[i] != NULLBYTE); i+=3)
+        string[i] = string[i] - ENCSTEPODD;
+
+    for(i = 0; (i < str_len && string[i] != NULLBYTE); i+=4)
+        string[i] = string[i] + ENCSTEPEVEN;
+
+    return string;
+}
+
+char *ss_decrypt(char *string)
+{
+    int i;
+    int str_len;
+
+    str_len = strlen(string);
+
+    for(i = 0; (i < str_len && string[i] != NULLBYTE); i++)
+        string[i] = string[i] - ENCOFFSET;
+
+    for(i = 0; (i < str_len && string[i] != NULLBYTE); i+=3)
+        string[i] = string[i] + ENCSTEPODD;
+
+    for(i = 0; (i < str_len && string[i] != NULLBYTE); i+=4)
+        string[i] = string[i] - ENCSTEPEVEN;
+
+    return string;
+}
+
 int process_line(char *line)
 {
     char *tok_srch = strtok(line, "=\" ");
 
+    /* reuse function */
+    /*else if(strncmp("temp",tok_srch,4) == 0)
+    {
+        tok_srch = strtok(NULL, " ");
+    }*/
+
     /* if line starts with a comment, skip */
     if(strncmp("#",tok_srch,1) == 0) 
     {
@@ -42,6 +86,34 @@ int process_line(char *line)
         sleep(atoi(tok_srch));
     }
 
+    /* ss encrypt function */
+    else if(strncmp("enc",tok_srch,3) == 0)
+    {
+        char *var_conv;
+        tok_srch = strtok(NULL, "\"");
+        var_conv = parse_vars(tok_srch);
+        if(var_conv != NULL)
+        {
+            char *encrp;
+            encrp = ss_encrypt(var_conv);
+            printf("%s\n", encrp);
+        }
+    }
+
+    /* ss decrypt function */
+    else if(strncmp("dec",tok_srch,3) == 0)
+    {
+        char *var_conv;
+        tok_srch = strtok(NULL, "\"");
+        var_conv = parse_vars(tok_srch);
+        if(var_conv != NULL)
+        {
+            char *encrp;
+            encrp = ss_decrypt(var_conv);
+            printf("%s\n", encrp);
+        }
+    }
+
     /* system execute function */
     else if(strncmp("exec",tok_srch,4) == 0)
     {

src/functions.h

@@ -5,4 +5,6 @@
     View README file supplied with this software for more details
 */
 
+char *ss_encrypt(char *string);
+char *ss_decrypt(char *string);
 int process_line(char *line);

test.ss

@@ -1,18 +1,54 @@
 #!/usr/bin/slidescript
 # This is a comment
 
+### These are variables in SS
+# Sets 'ss_filename' to 'file.txt'
 ss_filename=file.txt
-ss_file_content=This will be written to %ss_filename% in due course!
-ss_exec_command=ls -al
+# Sets 'ss_exec_command' to 'ls -al'
+ss_exec_command=uname -a
+# Sets 'ss_decoded' to 'Encrypt This Data!'
+ss_decoded=Decrypt This Data!
+# Sets 'ss_encoded' to 'Ghfs~su#Yilv#Gduf$'
+ss_encoded=Ghfs~su#Yilv#Gduf$
+# Sets 'ss_file_content' to 'This will be written to file.txt!'
+ss_file_content=Encrypted data: %ss_encoded%
 
-print "Writing '%ss_file_content%' to '%ss_filename%'"
+### The main program ###
+# Prints 'Writing 'This will be written to file.txt!' 
+# to 'file.txt'
+print "Sleeping before writing '%ss_file_content%' to '%ss_filename%'"
 
+# Pauses the script parse for x seconds, in this case 1.
 sleep 1
 
+# Writes the content of ss_file_content to ss_filename
 write "%ss_filename%" "%ss_file_content%"
 
+print "Data written to %ss_filename%:"
+# Reads data and prints to screen from ss_filename
 read "%ss_filename%"
 
+print "Deleting %ss_filename% after 1 second sleep..."
+# Sleep again for the giggles :P
+sleep 1
+
+# Deletes file written previously from ss_filename
 delete "%ss_filename%"
 
+print "Deleted %ss_filename%, executing '%ss_exec_command%' in 1 second"
+# Sleep some more
+sleep 1
+
+# Executes the ss_exec_command variable data, 'ls -al'
 exec "%ss_exec_command%"
+
+print "Encoding '%ss_decoded%' in 1 second"
+# More snooze
+sleep 1
+
+# Encodes 'ss_encode' data
+enc "%ss_decoded%"
+
+print "Decoding '%ss_encoded%'"
+# Decodes 'ss_decode' data
+dec "%ss_encoded%"