1 files changed, 137 insertions, 0 deletions
diff --git a/src/main.c b/src/main.c
new file mode 100644
index 0000000..b5e115e
--- /dev/null
+++ b/src/main.c
@@ -0,0 +1,137 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "./num.h"
+#include "./tga.h"
+#include "./upc.h"
+
+#define UPC_A_WIDTH 113
+#define UPC_A_HEIGHT 79
+
+typedef struct {
+    int eflag;
+    int nflag;
+    char *ovalue;
+} opts;
+
+char *getInput( int index, char *argv[] );
+opts parseOpts( int argc, char *argv[] );
+
+void DrawBarcode( char *dst, const char *src );
+void DrawNumbers( char *dst, const char *src );
+
+int main(int argc, char *argv[]) {
+
+    // Parse CLI options
+    opts options = parseOpts( argc, argv );
+
+    // Parse CLI input
+    char *input = getInput( optind, argv );
+    
+    // Set final element of input array to the appropriate check digit
+    input[11] = upc_a_calculate_check_digit( input );
+    
+    // Create array of chars to represent 1D barcode
+    const char *barcode = create_upc_a( input );
+
+    // Allocate memory to hold image data
+    char *image = malloc( UPC_A_WIDTH * UPC_A_HEIGHT );
+    
+    // Draw barcode to image data
+    DrawBarcode( image, barcode );
+    
+    // Draw human-readable interpretation if '-e' is used
+    if( options.nflag ) {
+        DrawNumbers( image, input );
+    }
+
+    free( input );
+    
+    // Create a .tga image file using image data
+    CreateTGA( options.ovalue, UPC_A_WIDTH, UPC_A_HEIGHT, image );
+    
+    free( image );
+    
+    return 0;
+}
+
+
+char *getInput( int index, char *argv[] ) {
+
+    char *result = malloc( 12 );
+
+    int k = 0;
+
+    for( int i = index; argv[i] != NULL; ++i ) {
+        for( int j = 0; j < strlen(argv[i]); ++j ) {
+            if( argv[i][j] < 58 && argv[i][j] > 47 ) {
+                result[k] = argv[i][j];
+                result[k] -= 48;
+                ++k;
+            }
+        }
+    }
+    if( k != 11 ) {
+        printf( "Inappropriate input detected!\nPlease provide an 11-digit number.\n" );
+    }
+
+    return result;
+}
+
+opts parseOpts( int argc, char *argv[] ) {
+
+    opts options = { 0, 0, NULL };
+    int c;
+    while( ( c = getopt(argc, argv, "eno:")) != -1 ) {
+        switch( c ) {
+            case 'e':
+                options.eflag = 1;
+                break;
+            case 'n':
+                options.nflag = 1;
+                break;
+            case 'o':
+                options.ovalue = optarg;
+                break;
+        }
+    }
+    return options;
+}
+
+void DrawBarcode( char *dst, const char *src ) {
+
+    const char UPC_A_QUIET_ZONE[9] = {0};
+
+    for(int i = 0; i < UPC_A_HEIGHT; ++i) {
+        memcpy( dst + (i * UPC_A_WIDTH), &UPC_A_QUIET_ZONE, sizeof(UPC_A_QUIET_ZONE) );
+        memcpy( dst + 9 + (i * UPC_A_WIDTH), src, 95 );
+        memcpy( dst + 104 + (i * UPC_A_WIDTH), &UPC_A_QUIET_ZONE, sizeof(UPC_A_QUIET_ZONE) );
+    }
+
+}
+
+void DrawNumbers( char *dst, const char *src ) {
+    const int POSITION_0 = UPC_A_WIDTH * (UPC_A_HEIGHT - 16) + 1;
+    const int POSITION_1 = UPC_A_WIDTH * (UPC_A_HEIGHT - 16) + 14;
+    const int POSITION_2 = UPC_A_WIDTH * (UPC_A_HEIGHT - 16) + 59;
+    const int POSITION_3 = UPC_A_WIDTH * (UPC_A_HEIGHT - 16) + 104;
+
+    for(int i = 0; i < 16; ++i) {
+        memcpy( dst + POSITION_0 + (i * UPC_A_WIDTH), NUMBER[src[0]][i], sizeof(NUMBER[0][i]) );
+    }
+    for( int i = 0; i < 5; ++i ) {
+        for(int j = 0; j < 16; ++j) {
+            memcpy( dst + POSITION_1 + (j * UPC_A_WIDTH) + (i * 8), NUMBER[src[i + 1]][j], sizeof(NUMBER[0][j]) );
+        }
+    }
+    for( int i = 0; i < 5; ++i ) {
+        for(int j = 0; j < 16; ++j) {
+            memcpy( dst + POSITION_2 + (j * UPC_A_WIDTH) + (i * 8), NUMBER[src[i + 6]][j], sizeof(NUMBER[0][j]) );
+        }
+    }
+    for(int i = 0; i < 16; ++i) {
+        memcpy( dst + POSITION_3 + (i * UPC_A_WIDTH), NUMBER[src[11]][i], sizeof(NUMBER[0][i]) );
+    }
+}