TableParse.cpp

#include <iostream>
#include <cstdlib>
#include "PrintInfo.h"


int Tvalue[32];
int Tinput[32];
int Tsize[32];
int Telements {0};


    // Very similar to pre_convert() in main.cpp
int FilterCharacters(int c) {

    // ASCII codes: 32 - space, 10 - new line, 35 - #, 65-86 are A-V, 48-57 are 0-9
    if(c >= 48 && c <= 57) {
        return c - 48;
    }
    if(c >= 65 && c <= 86) {
        return c - 55;
    }
    if(c == EOF) {
        return EOF;
    }
    if(c == 35) {
        return -3;
    }
    if(c == 10) {
        return -4;
    }
    if(c == 32) {
        return -5;
    }
        return -2;
}


    // Reads the table file and stores the values in the appropriate array
int TRead(char *table_name) {

    // File related variables
    FILE *table_in;

    // Check if file can be read
    if ((table_in = fopen(table_name,"rb")) == NULL) {
    // ERROR: Cannot read table
        PrintError(6);
        return 1;
    }

    // More variables for the rest of the code in this function
    int a {0};
    int count {0};
    int part {0};

    // Do some parsing code, uh, I dunno if this is the right way to do it but whatever
    while(a != EOF) {

    // Skip to new line if the character is a "#"
        if(a == -3) {
            while(a != -4 && a != EOF) {
                a = fgetc(table_in);
                a = FilterCharacters(a);
            }
        }

    // Get a character
        a = fgetc(table_in);
        a = FilterCharacters(a);

    // Put the first element from the table into Tinput[] if it doesn't already exist
        if(a >= 0 && part == 0) {
            count = 0;
            while(count < Telements) {
                if(a == Tinput[count]) {
    // ERROR: Duplicate input character
                    PrintError(7);
                    return 1;
                }
                count ++;
            }
            Tinput[Telements] = a;
            Tsize[Telements] = 0;
            Tvalue[Telements] = 0;
            a = fgetc(table_in);
            a = FilterCharacters(a);
            part = 1;
        }

    // Make sure that there is at least 1 space before the next element or get another character
        if(a == -5 && part == 1) {
            while(a < 0 && a != EOF) {
                a = fgetc(table_in);
                a = FilterCharacters(a);
            }
            part = 2;
        } else if(part == 1) {
    // ERROR: No space or invalid character
            PrintError(8);
            return 1;
        }

    // Put the second element from the table into Tvalue
        if((a == 0 || a == 1) && part == 2) {
            while(a == 0 || a == 1) {
                Tvalue[Telements] = (Tvalue[Telements] << 1) | a ;
                Tsize[Telements]++;
                if(Tsize[Telements] > 8) {
    // ERROR: More than 8 output bits
                    PrintError(9);
                    return 1;
                }
                a = fgetc(table_in);
                a = FilterCharacters(a);
            }
        }
        if((a == EOF || a == -4) && part == 2) {
            part = 0;
            Telements++;
        } else if(part == 2 && a != -3) {
    // ERROR: Invalid character
            PrintError(10);
            return 1;
        }
    }

    // Print table elements
    PrintInfoWithVariable(2, 0, &Telements);

    count = 0;
    // "Table input,output,size (dec):"
    PrintInfo(3);
    while(count < Telements) {
        printf("%d", Tinput[count]);
        printf(",%d", Tvalue[count]);
        printf(",%d\n", Tsize[count]);
        count++;
    }

    // Close file and exit
    fclose(table_in);

    return 0;
}


    // Makes the default table
int DefTable(int n) {

    unsigned char i {0b10000000};
    int count {0};
    int size {0};

    while(((i >> size) | (n - 1)) > (n - 1)) size++;
    size = 8 - size;

    while(count < n) {
        Tvalue[count] = count;
        Tinput[count] = count;
        Tsize[count] = size;
        count++;
    }

    Telements = count;

    return 0;
}